4061 lines
127 KiB
C
4061 lines
127 KiB
C
/*
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** 2014 August 30
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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**
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** OVERVIEW
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**
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** The RBU extension requires that the RBU update be packaged as an
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** SQLite database. The tables it expects to find are described in
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** sqlite3rbu.h. Essentially, for each table xyz in the target database
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** that the user wishes to write to, a corresponding data_xyz table is
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** created in the RBU database and populated with one row for each row to
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** update, insert or delete from the target table.
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**
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** The update proceeds in three stages:
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**
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** 1) The database is updated. The modified database pages are written
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** to a *-oal file. A *-oal file is just like a *-wal file, except
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** that it is named "<database>-oal" instead of "<database>-wal".
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** Because regular SQLite clients do not look for file named
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** "<database>-oal", they go on using the original database in
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** rollback mode while the *-oal file is being generated.
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**
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** During this stage RBU does not update the database by writing
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** directly to the target tables. Instead it creates "imposter"
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** tables using the SQLITE_TESTCTRL_IMPOSTER interface that it uses
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** to update each b-tree individually. All updates required by each
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** b-tree are completed before moving on to the next, and all
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** updates are done in sorted key order.
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**
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** 2) The "<database>-oal" file is moved to the equivalent "<database>-wal"
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** location using a call to rename(2). Before doing this the RBU
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** module takes an EXCLUSIVE lock on the database file, ensuring
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** that there are no other active readers.
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**
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** Once the EXCLUSIVE lock is released, any other database readers
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** detect the new *-wal file and read the database in wal mode. At
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** this point they see the new version of the database - including
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** the updates made as part of the RBU update.
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**
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** 3) The new *-wal file is checkpointed. This proceeds in the same way
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** as a regular database checkpoint, except that a single frame is
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** checkpointed each time sqlite3rbu_step() is called. If the RBU
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** handle is closed before the entire *-wal file is checkpointed,
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** the checkpoint progress is saved in the RBU database and the
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** checkpoint can be resumed by another RBU client at some point in
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** the future.
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**
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** POTENTIAL PROBLEMS
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**
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** The rename() call might not be portable. And RBU is not currently
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** syncing the directory after renaming the file.
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**
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** When state is saved, any commit to the *-oal file and the commit to
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** the RBU update database are not atomic. So if the power fails at the
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** wrong moment they might get out of sync. As the main database will be
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** committed before the RBU update database this will likely either just
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** pass unnoticed, or result in SQLITE_CONSTRAINT errors (due to UNIQUE
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** constraint violations).
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**
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** If some client does modify the target database mid RBU update, or some
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** other error occurs, the RBU extension will keep throwing errors. It's
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** not really clear how to get out of this state. The system could just
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** by delete the RBU update database and *-oal file and have the device
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** download the update again and start over.
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**
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** At present, for an UPDATE, both the new.* and old.* records are
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** collected in the rbu_xyz table. And for both UPDATEs and DELETEs all
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** fields are collected. This means we're probably writing a lot more
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** data to disk when saving the state of an ongoing update to the RBU
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** update database than is strictly necessary.
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**
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include "sqlite3.h"
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#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU)
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#include "sqlite3rbu.h"
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#if defined(_WIN32_WCE)
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#include "windows.h"
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#endif
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/* Maximum number of prepared UPDATE statements held by this module */
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#define SQLITE_RBU_UPDATE_CACHESIZE 16
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/*
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** Swap two objects of type TYPE.
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*/
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#if !defined(SQLITE_AMALGAMATION)
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# define SWAP(TYPE,A,B) {TYPE t=A; A=B; B=t;}
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#endif
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/*
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** The rbu_state table is used to save the state of a partially applied
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** update so that it can be resumed later. The table consists of integer
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** keys mapped to values as follows:
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**
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** RBU_STATE_STAGE:
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** May be set to integer values 1, 2, 4 or 5. As follows:
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** 1: the *-rbu file is currently under construction.
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** 2: the *-rbu file has been constructed, but not yet moved
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** to the *-wal path.
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** 4: the checkpoint is underway.
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** 5: the rbu update has been checkpointed.
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**
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** RBU_STATE_TBL:
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** Only valid if STAGE==1. The target database name of the table
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** currently being written.
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**
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** RBU_STATE_IDX:
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** Only valid if STAGE==1. The target database name of the index
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** currently being written, or NULL if the main table is currently being
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** updated.
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**
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** RBU_STATE_ROW:
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** Only valid if STAGE==1. Number of rows already processed for the current
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** table/index.
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**
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** RBU_STATE_PROGRESS:
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** Trbul number of sqlite3rbu_step() calls made so far as part of this
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** rbu update.
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**
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** RBU_STATE_CKPT:
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** Valid if STAGE==4. The 64-bit checksum associated with the wal-index
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** header created by recovering the *-wal file. This is used to detect
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** cases when another client appends frames to the *-wal file in the
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** middle of an incremental checkpoint (an incremental checkpoint cannot
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** be continued if this happens).
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**
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** RBU_STATE_COOKIE:
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** Valid if STAGE==1. The current change-counter cookie value in the
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** target db file.
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**
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** RBU_STATE_OALSZ:
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** Valid if STAGE==1. The size in bytes of the *-oal file.
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*/
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#define RBU_STATE_STAGE 1
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#define RBU_STATE_TBL 2
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#define RBU_STATE_IDX 3
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#define RBU_STATE_ROW 4
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#define RBU_STATE_PROGRESS 5
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#define RBU_STATE_CKPT 6
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#define RBU_STATE_COOKIE 7
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#define RBU_STATE_OALSZ 8
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#define RBU_STAGE_OAL 1
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#define RBU_STAGE_MOVE 2
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#define RBU_STAGE_CAPTURE 3
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#define RBU_STAGE_CKPT 4
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#define RBU_STAGE_DONE 5
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#define RBU_CREATE_STATE \
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"CREATE TABLE IF NOT EXISTS %s.rbu_state(k INTEGER PRIMARY KEY, v)"
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typedef struct RbuFrame RbuFrame;
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typedef struct RbuObjIter RbuObjIter;
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typedef struct RbuState RbuState;
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typedef struct rbu_vfs rbu_vfs;
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typedef struct rbu_file rbu_file;
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typedef struct RbuUpdateStmt RbuUpdateStmt;
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#if !defined(SQLITE_AMALGAMATION)
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typedef unsigned int u32;
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typedef unsigned char u8;
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typedef sqlite3_int64 i64;
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#endif
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/*
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** These values must match the values defined in wal.c for the equivalent
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** locks. These are not magic numbers as they are part of the SQLite file
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** format.
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*/
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#define WAL_LOCK_WRITE 0
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#define WAL_LOCK_CKPT 1
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#define WAL_LOCK_READ0 3
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/*
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** A structure to store values read from the rbu_state table in memory.
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*/
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struct RbuState {
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int eStage;
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char *zTbl;
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char *zIdx;
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i64 iWalCksum;
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int nRow;
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i64 nProgress;
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u32 iCookie;
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i64 iOalSz;
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};
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struct RbuUpdateStmt {
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char *zMask; /* Copy of update mask used with pUpdate */
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sqlite3_stmt *pUpdate; /* Last update statement (or NULL) */
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RbuUpdateStmt *pNext;
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};
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/*
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** An iterator of this type is used to iterate through all objects in
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** the target database that require updating. For each such table, the
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** iterator visits, in order:
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**
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** * the table itself,
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** * each index of the table (zero or more points to visit), and
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** * a special "cleanup table" state.
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**
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** abIndexed:
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** If the table has no indexes on it, abIndexed is set to NULL. Otherwise,
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** it points to an array of flags nTblCol elements in size. The flag is
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** set for each column that is either a part of the PK or a part of an
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** index. Or clear otherwise.
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**
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*/
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struct RbuObjIter {
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sqlite3_stmt *pTblIter; /* Iterate through tables */
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sqlite3_stmt *pIdxIter; /* Index iterator */
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int nTblCol; /* Size of azTblCol[] array */
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char **azTblCol; /* Array of unquoted target column names */
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char **azTblType; /* Array of target column types */
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int *aiSrcOrder; /* src table col -> target table col */
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u8 *abTblPk; /* Array of flags, set on target PK columns */
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u8 *abNotNull; /* Array of flags, set on NOT NULL columns */
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u8 *abIndexed; /* Array of flags, set on indexed & PK cols */
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int eType; /* Table type - an RBU_PK_XXX value */
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/* Output variables. zTbl==0 implies EOF. */
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int bCleanup; /* True in "cleanup" state */
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const char *zTbl; /* Name of target db table */
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const char *zDataTbl; /* Name of rbu db table (or null) */
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const char *zIdx; /* Name of target db index (or null) */
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int iTnum; /* Root page of current object */
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int iPkTnum; /* If eType==EXTERNAL, root of PK index */
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int bUnique; /* Current index is unique */
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/* Statements created by rbuObjIterPrepareAll() */
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int nCol; /* Number of columns in current object */
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sqlite3_stmt *pSelect; /* Source data */
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sqlite3_stmt *pInsert; /* Statement for INSERT operations */
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sqlite3_stmt *pDelete; /* Statement for DELETE ops */
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sqlite3_stmt *pTmpInsert; /* Insert into rbu_tmp_$zDataTbl */
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/* Last UPDATE used (for PK b-tree updates only), or NULL. */
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RbuUpdateStmt *pRbuUpdate;
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};
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/*
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** Values for RbuObjIter.eType
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**
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** 0: Table does not exist (error)
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** 1: Table has an implicit rowid.
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** 2: Table has an explicit IPK column.
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** 3: Table has an external PK index.
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** 4: Table is WITHOUT ROWID.
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** 5: Table is a virtual table.
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*/
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#define RBU_PK_NOTABLE 0
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#define RBU_PK_NONE 1
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#define RBU_PK_IPK 2
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#define RBU_PK_EXTERNAL 3
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#define RBU_PK_WITHOUT_ROWID 4
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#define RBU_PK_VTAB 5
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/*
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** Within the RBU_STAGE_OAL stage, each call to sqlite3rbu_step() performs
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** one of the following operations.
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*/
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#define RBU_INSERT 1 /* Insert on a main table b-tree */
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#define RBU_DELETE 2 /* Delete a row from a main table b-tree */
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#define RBU_IDX_DELETE 3 /* Delete a row from an aux. index b-tree */
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#define RBU_IDX_INSERT 4 /* Insert on an aux. index b-tree */
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#define RBU_UPDATE 5 /* Update a row in a main table b-tree */
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/*
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** A single step of an incremental checkpoint - frame iWalFrame of the wal
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** file should be copied to page iDbPage of the database file.
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*/
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struct RbuFrame {
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u32 iDbPage;
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u32 iWalFrame;
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};
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/*
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** RBU handle.
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*/
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struct sqlite3rbu {
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int eStage; /* Value of RBU_STATE_STAGE field */
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sqlite3 *dbMain; /* target database handle */
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sqlite3 *dbRbu; /* rbu database handle */
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char *zTarget; /* Path to target db */
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char *zRbu; /* Path to rbu db */
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char *zState; /* Path to state db (or NULL if zRbu) */
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char zStateDb[5]; /* Db name for state ("stat" or "main") */
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int rc; /* Value returned by last rbu_step() call */
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char *zErrmsg; /* Error message if rc!=SQLITE_OK */
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int nStep; /* Rows processed for current object */
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int nProgress; /* Rows processed for all objects */
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RbuObjIter objiter; /* Iterator for skipping through tbl/idx */
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const char *zVfsName; /* Name of automatically created rbu vfs */
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rbu_file *pTargetFd; /* File handle open on target db */
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i64 iOalSz;
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/* The following state variables are used as part of the incremental
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** checkpoint stage (eStage==RBU_STAGE_CKPT). See comments surrounding
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** function rbuSetupCheckpoint() for details. */
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u32 iMaxFrame; /* Largest iWalFrame value in aFrame[] */
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u32 mLock;
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int nFrame; /* Entries in aFrame[] array */
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int nFrameAlloc; /* Allocated size of aFrame[] array */
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RbuFrame *aFrame;
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int pgsz;
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u8 *aBuf;
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i64 iWalCksum;
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};
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/*
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** An rbu VFS is implemented using an instance of this structure.
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*/
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struct rbu_vfs {
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sqlite3_vfs base; /* rbu VFS shim methods */
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sqlite3_vfs *pRealVfs; /* Underlying VFS */
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sqlite3_mutex *mutex; /* Mutex to protect pMain */
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rbu_file *pMain; /* Linked list of main db files */
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};
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/*
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** Each file opened by an rbu VFS is represented by an instance of
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** the following structure.
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*/
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struct rbu_file {
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sqlite3_file base; /* sqlite3_file methods */
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sqlite3_file *pReal; /* Underlying file handle */
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rbu_vfs *pRbuVfs; /* Pointer to the rbu_vfs object */
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sqlite3rbu *pRbu; /* Pointer to rbu object (rbu target only) */
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int openFlags; /* Flags this file was opened with */
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u32 iCookie; /* Cookie value for main db files */
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u8 iWriteVer; /* "write-version" value for main db files */
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int nShm; /* Number of entries in apShm[] array */
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char **apShm; /* Array of mmap'd *-shm regions */
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char *zDel; /* Delete this when closing file */
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const char *zWal; /* Wal filename for this main db file */
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rbu_file *pWalFd; /* Wal file descriptor for this main db */
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rbu_file *pMainNext; /* Next MAIN_DB file */
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};
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/*************************************************************************
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** The following three functions, found below:
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**
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** rbuDeltaGetInt()
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** rbuDeltaChecksum()
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** rbuDeltaApply()
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**
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** are lifted from the fossil source code (http://fossil-scm.org). They
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** are used to implement the scalar SQL function rbu_fossil_delta().
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*/
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/*
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** Read bytes from *pz and convert them into a positive integer. When
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** finished, leave *pz pointing to the first character past the end of
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** the integer. The *pLen parameter holds the length of the string
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** in *pz and is decremented once for each character in the integer.
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*/
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static unsigned int rbuDeltaGetInt(const char **pz, int *pLen){
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static const signed char zValue[] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
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-1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
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25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, 36,
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-1, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
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52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, -1, -1, -1, 63, -1,
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};
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unsigned int v = 0;
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int c;
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unsigned char *z = (unsigned char*)*pz;
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unsigned char *zStart = z;
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while( (c = zValue[0x7f&*(z++)])>=0 ){
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v = (v<<6) + c;
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}
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z--;
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*pLen -= z - zStart;
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*pz = (char*)z;
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return v;
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}
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/*
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** Compute a 32-bit checksum on the N-byte buffer. Return the result.
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*/
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static unsigned int rbuDeltaChecksum(const char *zIn, size_t N){
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const unsigned char *z = (const unsigned char *)zIn;
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unsigned sum0 = 0;
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unsigned sum1 = 0;
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unsigned sum2 = 0;
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unsigned sum3 = 0;
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while(N >= 16){
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sum0 += ((unsigned)z[0] + z[4] + z[8] + z[12]);
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sum1 += ((unsigned)z[1] + z[5] + z[9] + z[13]);
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sum2 += ((unsigned)z[2] + z[6] + z[10]+ z[14]);
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sum3 += ((unsigned)z[3] + z[7] + z[11]+ z[15]);
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z += 16;
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N -= 16;
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}
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while(N >= 4){
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sum0 += z[0];
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sum1 += z[1];
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sum2 += z[2];
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sum3 += z[3];
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z += 4;
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N -= 4;
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}
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sum3 += (sum2 << 8) + (sum1 << 16) + (sum0 << 24);
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switch(N){
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case 3: sum3 += (z[2] << 8);
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case 2: sum3 += (z[1] << 16);
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case 1: sum3 += (z[0] << 24);
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default: ;
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}
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return sum3;
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}
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/*
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** Apply a delta.
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**
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** The output buffer should be big enough to hold the whole output
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** file and a NUL terminator at the end. The delta_output_size()
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** routine will determine this size for you.
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**
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** The delta string should be null-terminated. But the delta string
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** may contain embedded NUL characters (if the input and output are
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** binary files) so we also have to pass in the length of the delta in
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** the lenDelta parameter.
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**
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** This function returns the size of the output file in bytes (excluding
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** the final NUL terminator character). Except, if the delta string is
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** malformed or intended for use with a source file other than zSrc,
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** then this routine returns -1.
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**
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** Refer to the delta_create() documentation above for a description
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** of the delta file format.
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*/
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static int rbuDeltaApply(
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const char *zSrc, /* The source or pattern file */
|
|
int lenSrc, /* Length of the source file */
|
|
const char *zDelta, /* Delta to apply to the pattern */
|
|
int lenDelta, /* Length of the delta */
|
|
char *zOut /* Write the output into this preallocated buffer */
|
|
){
|
|
unsigned int limit;
|
|
unsigned int total = 0;
|
|
#ifndef FOSSIL_OMIT_DELTA_CKSUM_TEST
|
|
char *zOrigOut = zOut;
|
|
#endif
|
|
|
|
limit = rbuDeltaGetInt(&zDelta, &lenDelta);
|
|
if( *zDelta!='\n' ){
|
|
/* ERROR: size integer not terminated by "\n" */
|
|
return -1;
|
|
}
|
|
zDelta++; lenDelta--;
|
|
while( *zDelta && lenDelta>0 ){
|
|
unsigned int cnt, ofst;
|
|
cnt = rbuDeltaGetInt(&zDelta, &lenDelta);
|
|
switch( zDelta[0] ){
|
|
case '@': {
|
|
zDelta++; lenDelta--;
|
|
ofst = rbuDeltaGetInt(&zDelta, &lenDelta);
|
|
if( lenDelta>0 && zDelta[0]!=',' ){
|
|
/* ERROR: copy command not terminated by ',' */
|
|
return -1;
|
|
}
|
|
zDelta++; lenDelta--;
|
|
total += cnt;
|
|
if( total>limit ){
|
|
/* ERROR: copy exceeds output file size */
|
|
return -1;
|
|
}
|
|
if( (int)(ofst+cnt) > lenSrc ){
|
|
/* ERROR: copy extends past end of input */
|
|
return -1;
|
|
}
|
|
memcpy(zOut, &zSrc[ofst], cnt);
|
|
zOut += cnt;
|
|
break;
|
|
}
|
|
case ':': {
|
|
zDelta++; lenDelta--;
|
|
total += cnt;
|
|
if( total>limit ){
|
|
/* ERROR: insert command gives an output larger than predicted */
|
|
return -1;
|
|
}
|
|
if( (int)cnt>lenDelta ){
|
|
/* ERROR: insert count exceeds size of delta */
|
|
return -1;
|
|
}
|
|
memcpy(zOut, zDelta, cnt);
|
|
zOut += cnt;
|
|
zDelta += cnt;
|
|
lenDelta -= cnt;
|
|
break;
|
|
}
|
|
case ';': {
|
|
zDelta++; lenDelta--;
|
|
zOut[0] = 0;
|
|
#ifndef FOSSIL_OMIT_DELTA_CKSUM_TEST
|
|
if( cnt!=rbuDeltaChecksum(zOrigOut, total) ){
|
|
/* ERROR: bad checksum */
|
|
return -1;
|
|
}
|
|
#endif
|
|
if( total!=limit ){
|
|
/* ERROR: generated size does not match predicted size */
|
|
return -1;
|
|
}
|
|
return total;
|
|
}
|
|
default: {
|
|
/* ERROR: unknown delta operator */
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
/* ERROR: unterminated delta */
|
|
return -1;
|
|
}
|
|
|
|
static int rbuDeltaOutputSize(const char *zDelta, int lenDelta){
|
|
int size;
|
|
size = rbuDeltaGetInt(&zDelta, &lenDelta);
|
|
if( *zDelta!='\n' ){
|
|
/* ERROR: size integer not terminated by "\n" */
|
|
return -1;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
** End of code taken from fossil.
|
|
*************************************************************************/
|
|
|
|
/*
|
|
** Implementation of SQL scalar function rbu_fossil_delta().
|
|
**
|
|
** This function applies a fossil delta patch to a blob. Exactly two
|
|
** arguments must be passed to this function. The first is the blob to
|
|
** patch and the second the patch to apply. If no error occurs, this
|
|
** function returns the patched blob.
|
|
*/
|
|
static void rbuFossilDeltaFunc(
|
|
sqlite3_context *context,
|
|
int argc,
|
|
sqlite3_value **argv
|
|
){
|
|
const char *aDelta;
|
|
int nDelta;
|
|
const char *aOrig;
|
|
int nOrig;
|
|
|
|
int nOut;
|
|
int nOut2;
|
|
char *aOut;
|
|
|
|
assert( argc==2 );
|
|
|
|
nOrig = sqlite3_value_bytes(argv[0]);
|
|
aOrig = (const char*)sqlite3_value_blob(argv[0]);
|
|
nDelta = sqlite3_value_bytes(argv[1]);
|
|
aDelta = (const char*)sqlite3_value_blob(argv[1]);
|
|
|
|
/* Figure out the size of the output */
|
|
nOut = rbuDeltaOutputSize(aDelta, nDelta);
|
|
if( nOut<0 ){
|
|
sqlite3_result_error(context, "corrupt fossil delta", -1);
|
|
return;
|
|
}
|
|
|
|
aOut = sqlite3_malloc(nOut+1);
|
|
if( aOut==0 ){
|
|
sqlite3_result_error_nomem(context);
|
|
}else{
|
|
nOut2 = rbuDeltaApply(aOrig, nOrig, aDelta, nDelta, aOut);
|
|
if( nOut2!=nOut ){
|
|
sqlite3_result_error(context, "corrupt fossil delta", -1);
|
|
}else{
|
|
sqlite3_result_blob(context, aOut, nOut, sqlite3_free);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** Prepare the SQL statement in buffer zSql against database handle db.
|
|
** If successful, set *ppStmt to point to the new statement and return
|
|
** SQLITE_OK.
|
|
**
|
|
** Otherwise, if an error does occur, set *ppStmt to NULL and return
|
|
** an SQLite error code. Additionally, set output variable *pzErrmsg to
|
|
** point to a buffer containing an error message. It is the responsibility
|
|
** of the caller to (eventually) free this buffer using sqlite3_free().
|
|
*/
|
|
static int prepareAndCollectError(
|
|
sqlite3 *db,
|
|
sqlite3_stmt **ppStmt,
|
|
char **pzErrmsg,
|
|
const char *zSql
|
|
){
|
|
int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
|
|
if( rc!=SQLITE_OK ){
|
|
*pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
|
|
*ppStmt = 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Reset the SQL statement passed as the first argument. Return a copy
|
|
** of the value returned by sqlite3_reset().
|
|
**
|
|
** If an error has occurred, then set *pzErrmsg to point to a buffer
|
|
** containing an error message. It is the responsibility of the caller
|
|
** to eventually free this buffer using sqlite3_free().
|
|
*/
|
|
static int resetAndCollectError(sqlite3_stmt *pStmt, char **pzErrmsg){
|
|
int rc = sqlite3_reset(pStmt);
|
|
if( rc!=SQLITE_OK ){
|
|
*pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(sqlite3_db_handle(pStmt)));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Unless it is NULL, argument zSql points to a buffer allocated using
|
|
** sqlite3_malloc containing an SQL statement. This function prepares the SQL
|
|
** statement against database db and frees the buffer. If statement
|
|
** compilation is successful, *ppStmt is set to point to the new statement
|
|
** handle and SQLITE_OK is returned.
|
|
**
|
|
** Otherwise, if an error occurs, *ppStmt is set to NULL and an error code
|
|
** returned. In this case, *pzErrmsg may also be set to point to an error
|
|
** message. It is the responsibility of the caller to free this error message
|
|
** buffer using sqlite3_free().
|
|
**
|
|
** If argument zSql is NULL, this function assumes that an OOM has occurred.
|
|
** In this case SQLITE_NOMEM is returned and *ppStmt set to NULL.
|
|
*/
|
|
static int prepareFreeAndCollectError(
|
|
sqlite3 *db,
|
|
sqlite3_stmt **ppStmt,
|
|
char **pzErrmsg,
|
|
char *zSql
|
|
){
|
|
int rc;
|
|
assert( *pzErrmsg==0 );
|
|
if( zSql==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
*ppStmt = 0;
|
|
}else{
|
|
rc = prepareAndCollectError(db, ppStmt, pzErrmsg, zSql);
|
|
sqlite3_free(zSql);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Free the RbuObjIter.azTblCol[] and RbuObjIter.abTblPk[] arrays allocated
|
|
** by an earlier call to rbuObjIterCacheTableInfo().
|
|
*/
|
|
static void rbuObjIterFreeCols(RbuObjIter *pIter){
|
|
int i;
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
sqlite3_free(pIter->azTblCol[i]);
|
|
sqlite3_free(pIter->azTblType[i]);
|
|
}
|
|
sqlite3_free(pIter->azTblCol);
|
|
pIter->azTblCol = 0;
|
|
pIter->azTblType = 0;
|
|
pIter->aiSrcOrder = 0;
|
|
pIter->abTblPk = 0;
|
|
pIter->abNotNull = 0;
|
|
pIter->nTblCol = 0;
|
|
pIter->eType = 0; /* Invalid value */
|
|
}
|
|
|
|
/*
|
|
** Finalize all statements and free all allocations that are specific to
|
|
** the current object (table/index pair).
|
|
*/
|
|
static void rbuObjIterClearStatements(RbuObjIter *pIter){
|
|
RbuUpdateStmt *pUp;
|
|
|
|
sqlite3_finalize(pIter->pSelect);
|
|
sqlite3_finalize(pIter->pInsert);
|
|
sqlite3_finalize(pIter->pDelete);
|
|
sqlite3_finalize(pIter->pTmpInsert);
|
|
pUp = pIter->pRbuUpdate;
|
|
while( pUp ){
|
|
RbuUpdateStmt *pTmp = pUp->pNext;
|
|
sqlite3_finalize(pUp->pUpdate);
|
|
sqlite3_free(pUp);
|
|
pUp = pTmp;
|
|
}
|
|
|
|
pIter->pSelect = 0;
|
|
pIter->pInsert = 0;
|
|
pIter->pDelete = 0;
|
|
pIter->pRbuUpdate = 0;
|
|
pIter->pTmpInsert = 0;
|
|
pIter->nCol = 0;
|
|
}
|
|
|
|
/*
|
|
** Clean up any resources allocated as part of the iterator object passed
|
|
** as the only argument.
|
|
*/
|
|
static void rbuObjIterFinalize(RbuObjIter *pIter){
|
|
rbuObjIterClearStatements(pIter);
|
|
sqlite3_finalize(pIter->pTblIter);
|
|
sqlite3_finalize(pIter->pIdxIter);
|
|
rbuObjIterFreeCols(pIter);
|
|
memset(pIter, 0, sizeof(RbuObjIter));
|
|
}
|
|
|
|
/*
|
|
** Advance the iterator to the next position.
|
|
**
|
|
** If no error occurs, SQLITE_OK is returned and the iterator is left
|
|
** pointing to the next entry. Otherwise, an error code and message is
|
|
** left in the RBU handle passed as the first argument. A copy of the
|
|
** error code is returned.
|
|
*/
|
|
static int rbuObjIterNext(sqlite3rbu *p, RbuObjIter *pIter){
|
|
int rc = p->rc;
|
|
if( rc==SQLITE_OK ){
|
|
|
|
/* Free any SQLite statements used while processing the previous object */
|
|
rbuObjIterClearStatements(pIter);
|
|
if( pIter->zIdx==0 ){
|
|
rc = sqlite3_exec(p->dbMain,
|
|
"DROP TRIGGER IF EXISTS temp.rbu_insert_tr;"
|
|
"DROP TRIGGER IF EXISTS temp.rbu_update1_tr;"
|
|
"DROP TRIGGER IF EXISTS temp.rbu_update2_tr;"
|
|
"DROP TRIGGER IF EXISTS temp.rbu_delete_tr;"
|
|
, 0, 0, &p->zErrmsg
|
|
);
|
|
}
|
|
|
|
if( rc==SQLITE_OK ){
|
|
if( pIter->bCleanup ){
|
|
rbuObjIterFreeCols(pIter);
|
|
pIter->bCleanup = 0;
|
|
rc = sqlite3_step(pIter->pTblIter);
|
|
if( rc!=SQLITE_ROW ){
|
|
rc = resetAndCollectError(pIter->pTblIter, &p->zErrmsg);
|
|
pIter->zTbl = 0;
|
|
}else{
|
|
pIter->zTbl = (const char*)sqlite3_column_text(pIter->pTblIter, 0);
|
|
pIter->zDataTbl = (const char*)sqlite3_column_text(pIter->pTblIter,1);
|
|
rc = (pIter->zDataTbl && pIter->zTbl) ? SQLITE_OK : SQLITE_NOMEM;
|
|
}
|
|
}else{
|
|
if( pIter->zIdx==0 ){
|
|
sqlite3_stmt *pIdx = pIter->pIdxIter;
|
|
rc = sqlite3_bind_text(pIdx, 1, pIter->zTbl, -1, SQLITE_STATIC);
|
|
}
|
|
if( rc==SQLITE_OK ){
|
|
rc = sqlite3_step(pIter->pIdxIter);
|
|
if( rc!=SQLITE_ROW ){
|
|
rc = resetAndCollectError(pIter->pIdxIter, &p->zErrmsg);
|
|
pIter->bCleanup = 1;
|
|
pIter->zIdx = 0;
|
|
}else{
|
|
pIter->zIdx = (const char*)sqlite3_column_text(pIter->pIdxIter, 0);
|
|
pIter->iTnum = sqlite3_column_int(pIter->pIdxIter, 1);
|
|
pIter->bUnique = sqlite3_column_int(pIter->pIdxIter, 2);
|
|
rc = pIter->zIdx ? SQLITE_OK : SQLITE_NOMEM;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if( rc!=SQLITE_OK ){
|
|
rbuObjIterFinalize(pIter);
|
|
p->rc = rc;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
** The implementation of the rbu_target_name() SQL function. This function
|
|
** accepts one argument - the name of a table in the RBU database. If the
|
|
** table name matches the pattern:
|
|
**
|
|
** data[0-9]_<name>
|
|
**
|
|
** where <name> is any sequence of 1 or more characters, <name> is returned.
|
|
** Otherwise, if the only argument does not match the above pattern, an SQL
|
|
** NULL is returned.
|
|
**
|
|
** "data_t1" -> "t1"
|
|
** "data0123_t2" -> "t2"
|
|
** "dataAB_t3" -> NULL
|
|
*/
|
|
static void rbuTargetNameFunc(
|
|
sqlite3_context *context,
|
|
int argc,
|
|
sqlite3_value **argv
|
|
){
|
|
const char *zIn;
|
|
assert( argc==1 );
|
|
|
|
zIn = (const char*)sqlite3_value_text(argv[0]);
|
|
if( zIn && strlen(zIn)>4 && memcmp("data", zIn, 4)==0 ){
|
|
int i;
|
|
for(i=4; zIn[i]>='0' && zIn[i]<='9'; i++);
|
|
if( zIn[i]=='_' && zIn[i+1] ){
|
|
sqlite3_result_text(context, &zIn[i+1], -1, SQLITE_STATIC);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Initialize the iterator structure passed as the second argument.
|
|
**
|
|
** If no error occurs, SQLITE_OK is returned and the iterator is left
|
|
** pointing to the first entry. Otherwise, an error code and message is
|
|
** left in the RBU handle passed as the first argument. A copy of the
|
|
** error code is returned.
|
|
*/
|
|
static int rbuObjIterFirst(sqlite3rbu *p, RbuObjIter *pIter){
|
|
int rc;
|
|
memset(pIter, 0, sizeof(RbuObjIter));
|
|
|
|
rc = prepareAndCollectError(p->dbRbu, &pIter->pTblIter, &p->zErrmsg,
|
|
"SELECT rbu_target_name(name) AS target, name FROM sqlite_master "
|
|
"WHERE type IN ('table', 'view') AND target IS NOT NULL "
|
|
"ORDER BY name"
|
|
);
|
|
|
|
if( rc==SQLITE_OK ){
|
|
rc = prepareAndCollectError(p->dbMain, &pIter->pIdxIter, &p->zErrmsg,
|
|
"SELECT name, rootpage, sql IS NULL OR substr(8, 6)=='UNIQUE' "
|
|
" FROM main.sqlite_master "
|
|
" WHERE type='index' AND tbl_name = ?"
|
|
);
|
|
}
|
|
|
|
pIter->bCleanup = 1;
|
|
p->rc = rc;
|
|
return rbuObjIterNext(p, pIter);
|
|
}
|
|
|
|
/*
|
|
** This is a wrapper around "sqlite3_mprintf(zFmt, ...)". If an OOM occurs,
|
|
** an error code is stored in the RBU handle passed as the first argument.
|
|
**
|
|
** If an error has already occurred (p->rc is already set to something other
|
|
** than SQLITE_OK), then this function returns NULL without modifying the
|
|
** stored error code. In this case it still calls sqlite3_free() on any
|
|
** printf() parameters associated with %z conversions.
|
|
*/
|
|
static char *rbuMPrintf(sqlite3rbu *p, const char *zFmt, ...){
|
|
char *zSql = 0;
|
|
va_list ap;
|
|
va_start(ap, zFmt);
|
|
zSql = sqlite3_vmprintf(zFmt, ap);
|
|
if( p->rc==SQLITE_OK ){
|
|
if( zSql==0 ) p->rc = SQLITE_NOMEM;
|
|
}else{
|
|
sqlite3_free(zSql);
|
|
zSql = 0;
|
|
}
|
|
va_end(ap);
|
|
return zSql;
|
|
}
|
|
|
|
/*
|
|
** Argument zFmt is a sqlite3_mprintf() style format string. The trailing
|
|
** arguments are the usual subsitution values. This function performs
|
|
** the printf() style substitutions and executes the result as an SQL
|
|
** statement on the RBU handles database.
|
|
**
|
|
** If an error occurs, an error code and error message is stored in the
|
|
** RBU handle. If an error has already occurred when this function is
|
|
** called, it is a no-op.
|
|
*/
|
|
static int rbuMPrintfExec(sqlite3rbu *p, sqlite3 *db, const char *zFmt, ...){
|
|
va_list ap;
|
|
char *zSql;
|
|
va_start(ap, zFmt);
|
|
zSql = sqlite3_vmprintf(zFmt, ap);
|
|
if( p->rc==SQLITE_OK ){
|
|
if( zSql==0 ){
|
|
p->rc = SQLITE_NOMEM;
|
|
}else{
|
|
p->rc = sqlite3_exec(db, zSql, 0, 0, &p->zErrmsg);
|
|
}
|
|
}
|
|
sqlite3_free(zSql);
|
|
va_end(ap);
|
|
return p->rc;
|
|
}
|
|
|
|
/*
|
|
** Attempt to allocate and return a pointer to a zeroed block of nByte
|
|
** bytes.
|
|
**
|
|
** If an error (i.e. an OOM condition) occurs, return NULL and leave an
|
|
** error code in the rbu handle passed as the first argument. Or, if an
|
|
** error has already occurred when this function is called, return NULL
|
|
** immediately without attempting the allocation or modifying the stored
|
|
** error code.
|
|
*/
|
|
static void *rbuMalloc(sqlite3rbu *p, int nByte){
|
|
void *pRet = 0;
|
|
if( p->rc==SQLITE_OK ){
|
|
assert( nByte>0 );
|
|
pRet = sqlite3_malloc64(nByte);
|
|
if( pRet==0 ){
|
|
p->rc = SQLITE_NOMEM;
|
|
}else{
|
|
memset(pRet, 0, nByte);
|
|
}
|
|
}
|
|
return pRet;
|
|
}
|
|
|
|
|
|
/*
|
|
** Allocate and zero the pIter->azTblCol[] and abTblPk[] arrays so that
|
|
** there is room for at least nCol elements. If an OOM occurs, store an
|
|
** error code in the RBU handle passed as the first argument.
|
|
*/
|
|
static void rbuAllocateIterArrays(sqlite3rbu *p, RbuObjIter *pIter, int nCol){
|
|
int nByte = (2*sizeof(char*) + sizeof(int) + 3*sizeof(u8)) * nCol;
|
|
char **azNew;
|
|
|
|
azNew = (char**)rbuMalloc(p, nByte);
|
|
if( azNew ){
|
|
pIter->azTblCol = azNew;
|
|
pIter->azTblType = &azNew[nCol];
|
|
pIter->aiSrcOrder = (int*)&pIter->azTblType[nCol];
|
|
pIter->abTblPk = (u8*)&pIter->aiSrcOrder[nCol];
|
|
pIter->abNotNull = (u8*)&pIter->abTblPk[nCol];
|
|
pIter->abIndexed = (u8*)&pIter->abNotNull[nCol];
|
|
}
|
|
}
|
|
|
|
/*
|
|
** The first argument must be a nul-terminated string. This function
|
|
** returns a copy of the string in memory obtained from sqlite3_malloc().
|
|
** It is the responsibility of the caller to eventually free this memory
|
|
** using sqlite3_free().
|
|
**
|
|
** If an OOM condition is encountered when attempting to allocate memory,
|
|
** output variable (*pRc) is set to SQLITE_NOMEM before returning. Otherwise,
|
|
** if the allocation succeeds, (*pRc) is left unchanged.
|
|
*/
|
|
static char *rbuStrndup(const char *zStr, int *pRc){
|
|
char *zRet = 0;
|
|
|
|
assert( *pRc==SQLITE_OK );
|
|
if( zStr ){
|
|
size_t nCopy = strlen(zStr) + 1;
|
|
zRet = (char*)sqlite3_malloc64(nCopy);
|
|
if( zRet ){
|
|
memcpy(zRet, zStr, nCopy);
|
|
}else{
|
|
*pRc = SQLITE_NOMEM;
|
|
}
|
|
}
|
|
|
|
return zRet;
|
|
}
|
|
|
|
/*
|
|
** Finalize the statement passed as the second argument.
|
|
**
|
|
** If the sqlite3_finalize() call indicates that an error occurs, and the
|
|
** rbu handle error code is not already set, set the error code and error
|
|
** message accordingly.
|
|
*/
|
|
static void rbuFinalize(sqlite3rbu *p, sqlite3_stmt *pStmt){
|
|
sqlite3 *db = sqlite3_db_handle(pStmt);
|
|
int rc = sqlite3_finalize(pStmt);
|
|
if( p->rc==SQLITE_OK && rc!=SQLITE_OK ){
|
|
p->rc = rc;
|
|
p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
|
|
}
|
|
}
|
|
|
|
/* Determine the type of a table.
|
|
**
|
|
** peType is of type (int*), a pointer to an output parameter of type
|
|
** (int). This call sets the output parameter as follows, depending
|
|
** on the type of the table specified by parameters dbName and zTbl.
|
|
**
|
|
** RBU_PK_NOTABLE: No such table.
|
|
** RBU_PK_NONE: Table has an implicit rowid.
|
|
** RBU_PK_IPK: Table has an explicit IPK column.
|
|
** RBU_PK_EXTERNAL: Table has an external PK index.
|
|
** RBU_PK_WITHOUT_ROWID: Table is WITHOUT ROWID.
|
|
** RBU_PK_VTAB: Table is a virtual table.
|
|
**
|
|
** Argument *piPk is also of type (int*), and also points to an output
|
|
** parameter. Unless the table has an external primary key index
|
|
** (i.e. unless *peType is set to 3), then *piPk is set to zero. Or,
|
|
** if the table does have an external primary key index, then *piPk
|
|
** is set to the root page number of the primary key index before
|
|
** returning.
|
|
**
|
|
** ALGORITHM:
|
|
**
|
|
** if( no entry exists in sqlite_master ){
|
|
** return RBU_PK_NOTABLE
|
|
** }else if( sql for the entry starts with "CREATE VIRTUAL" ){
|
|
** return RBU_PK_VTAB
|
|
** }else if( "PRAGMA index_list()" for the table contains a "pk" index ){
|
|
** if( the index that is the pk exists in sqlite_master ){
|
|
** *piPK = rootpage of that index.
|
|
** return RBU_PK_EXTERNAL
|
|
** }else{
|
|
** return RBU_PK_WITHOUT_ROWID
|
|
** }
|
|
** }else if( "PRAGMA table_info()" lists one or more "pk" columns ){
|
|
** return RBU_PK_IPK
|
|
** }else{
|
|
** return RBU_PK_NONE
|
|
** }
|
|
*/
|
|
static void rbuTableType(
|
|
sqlite3rbu *p,
|
|
const char *zTab,
|
|
int *peType,
|
|
int *piTnum,
|
|
int *piPk
|
|
){
|
|
/*
|
|
** 0) SELECT count(*) FROM sqlite_master where name=%Q AND IsVirtual(%Q)
|
|
** 1) PRAGMA index_list = ?
|
|
** 2) SELECT count(*) FROM sqlite_master where name=%Q
|
|
** 3) PRAGMA table_info = ?
|
|
*/
|
|
sqlite3_stmt *aStmt[4] = {0, 0, 0, 0};
|
|
|
|
*peType = RBU_PK_NOTABLE;
|
|
*piPk = 0;
|
|
|
|
assert( p->rc==SQLITE_OK );
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[0], &p->zErrmsg,
|
|
sqlite3_mprintf(
|
|
"SELECT (sql LIKE 'create virtual%%'), rootpage"
|
|
" FROM sqlite_master"
|
|
" WHERE name=%Q", zTab
|
|
));
|
|
if( p->rc!=SQLITE_OK || sqlite3_step(aStmt[0])!=SQLITE_ROW ){
|
|
/* Either an error, or no such table. */
|
|
goto rbuTableType_end;
|
|
}
|
|
if( sqlite3_column_int(aStmt[0], 0) ){
|
|
*peType = RBU_PK_VTAB; /* virtual table */
|
|
goto rbuTableType_end;
|
|
}
|
|
*piTnum = sqlite3_column_int(aStmt[0], 1);
|
|
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[1], &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA index_list=%Q",zTab)
|
|
);
|
|
if( p->rc ) goto rbuTableType_end;
|
|
while( sqlite3_step(aStmt[1])==SQLITE_ROW ){
|
|
const u8 *zOrig = sqlite3_column_text(aStmt[1], 3);
|
|
const u8 *zIdx = sqlite3_column_text(aStmt[1], 1);
|
|
if( zOrig && zIdx && zOrig[0]=='p' ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[2], &p->zErrmsg,
|
|
sqlite3_mprintf(
|
|
"SELECT rootpage FROM sqlite_master WHERE name = %Q", zIdx
|
|
));
|
|
if( p->rc==SQLITE_OK ){
|
|
if( sqlite3_step(aStmt[2])==SQLITE_ROW ){
|
|
*piPk = sqlite3_column_int(aStmt[2], 0);
|
|
*peType = RBU_PK_EXTERNAL;
|
|
}else{
|
|
*peType = RBU_PK_WITHOUT_ROWID;
|
|
}
|
|
}
|
|
goto rbuTableType_end;
|
|
}
|
|
}
|
|
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &aStmt[3], &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA table_info=%Q",zTab)
|
|
);
|
|
if( p->rc==SQLITE_OK ){
|
|
while( sqlite3_step(aStmt[3])==SQLITE_ROW ){
|
|
if( sqlite3_column_int(aStmt[3],5)>0 ){
|
|
*peType = RBU_PK_IPK; /* explicit IPK column */
|
|
goto rbuTableType_end;
|
|
}
|
|
}
|
|
*peType = RBU_PK_NONE;
|
|
}
|
|
|
|
rbuTableType_end: {
|
|
unsigned int i;
|
|
for(i=0; i<sizeof(aStmt)/sizeof(aStmt[0]); i++){
|
|
rbuFinalize(p, aStmt[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This is a helper function for rbuObjIterCacheTableInfo(). It populates
|
|
** the pIter->abIndexed[] array.
|
|
*/
|
|
static void rbuObjIterCacheIndexedCols(sqlite3rbu *p, RbuObjIter *pIter){
|
|
sqlite3_stmt *pList = 0;
|
|
int bIndex = 0;
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
memcpy(pIter->abIndexed, pIter->abTblPk, sizeof(u8)*pIter->nTblCol);
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pList, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
|
|
);
|
|
}
|
|
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pList) ){
|
|
const char *zIdx = (const char*)sqlite3_column_text(pList, 1);
|
|
sqlite3_stmt *pXInfo = 0;
|
|
if( zIdx==0 ) break;
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
|
|
);
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
|
|
int iCid = sqlite3_column_int(pXInfo, 1);
|
|
if( iCid>=0 ) pIter->abIndexed[iCid] = 1;
|
|
}
|
|
rbuFinalize(p, pXInfo);
|
|
bIndex = 1;
|
|
}
|
|
|
|
rbuFinalize(p, pList);
|
|
if( bIndex==0 ) pIter->abIndexed = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
** If they are not already populated, populate the pIter->azTblCol[],
|
|
** pIter->abTblPk[], pIter->nTblCol and pIter->bRowid variables according to
|
|
** the table (not index) that the iterator currently points to.
|
|
**
|
|
** Return SQLITE_OK if successful, or an SQLite error code otherwise. If
|
|
** an error does occur, an error code and error message are also left in
|
|
** the RBU handle.
|
|
*/
|
|
static int rbuObjIterCacheTableInfo(sqlite3rbu *p, RbuObjIter *pIter){
|
|
if( pIter->azTblCol==0 ){
|
|
sqlite3_stmt *pStmt = 0;
|
|
int nCol = 0;
|
|
int i; /* for() loop iterator variable */
|
|
int bRbuRowid = 0; /* If input table has column "rbu_rowid" */
|
|
int iOrder = 0;
|
|
int iTnum = 0;
|
|
|
|
/* Figure out the type of table this step will deal with. */
|
|
assert( pIter->eType==0 );
|
|
rbuTableType(p, pIter->zTbl, &pIter->eType, &iTnum, &pIter->iPkTnum);
|
|
if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_NOTABLE ){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("no such table: %s", pIter->zTbl);
|
|
}
|
|
if( p->rc ) return p->rc;
|
|
if( pIter->zIdx==0 ) pIter->iTnum = iTnum;
|
|
|
|
assert( pIter->eType==RBU_PK_NONE || pIter->eType==RBU_PK_IPK
|
|
|| pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_WITHOUT_ROWID
|
|
|| pIter->eType==RBU_PK_VTAB
|
|
);
|
|
|
|
/* Populate the azTblCol[] and nTblCol variables based on the columns
|
|
** of the input table. Ignore any input table columns that begin with
|
|
** "rbu_". */
|
|
p->rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
|
|
sqlite3_mprintf("SELECT * FROM '%q'", pIter->zDataTbl)
|
|
);
|
|
if( p->rc==SQLITE_OK ){
|
|
nCol = sqlite3_column_count(pStmt);
|
|
rbuAllocateIterArrays(p, pIter, nCol);
|
|
}
|
|
for(i=0; p->rc==SQLITE_OK && i<nCol; i++){
|
|
const char *zName = (const char*)sqlite3_column_name(pStmt, i);
|
|
if( sqlite3_strnicmp("rbu_", zName, 4) ){
|
|
char *zCopy = rbuStrndup(zName, &p->rc);
|
|
pIter->aiSrcOrder[pIter->nTblCol] = pIter->nTblCol;
|
|
pIter->azTblCol[pIter->nTblCol++] = zCopy;
|
|
}
|
|
else if( 0==sqlite3_stricmp("rbu_rowid", zName) ){
|
|
bRbuRowid = 1;
|
|
}
|
|
}
|
|
sqlite3_finalize(pStmt);
|
|
pStmt = 0;
|
|
|
|
if( p->rc==SQLITE_OK
|
|
&& bRbuRowid!=(pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
|
|
){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf(
|
|
"table %q %s rbu_rowid column", pIter->zDataTbl,
|
|
(bRbuRowid ? "may not have" : "requires")
|
|
);
|
|
}
|
|
|
|
/* Check that all non-HIDDEN columns in the destination table are also
|
|
** present in the input table. Populate the abTblPk[], azTblType[] and
|
|
** aiTblOrder[] arrays at the same time. */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA table_info(%Q)", pIter->zTbl)
|
|
);
|
|
}
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
|
|
const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
|
|
if( zName==0 ) break; /* An OOM - finalize() below returns S_NOMEM */
|
|
for(i=iOrder; i<pIter->nTblCol; i++){
|
|
if( 0==strcmp(zName, pIter->azTblCol[i]) ) break;
|
|
}
|
|
if( i==pIter->nTblCol ){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("column missing from %q: %s",
|
|
pIter->zDataTbl, zName
|
|
);
|
|
}else{
|
|
int iPk = sqlite3_column_int(pStmt, 5);
|
|
int bNotNull = sqlite3_column_int(pStmt, 3);
|
|
const char *zType = (const char*)sqlite3_column_text(pStmt, 2);
|
|
|
|
if( i!=iOrder ){
|
|
SWAP(int, pIter->aiSrcOrder[i], pIter->aiSrcOrder[iOrder]);
|
|
SWAP(char*, pIter->azTblCol[i], pIter->azTblCol[iOrder]);
|
|
}
|
|
|
|
pIter->azTblType[iOrder] = rbuStrndup(zType, &p->rc);
|
|
pIter->abTblPk[iOrder] = (iPk!=0);
|
|
pIter->abNotNull[iOrder] = (u8)bNotNull || (iPk!=0);
|
|
iOrder++;
|
|
}
|
|
}
|
|
|
|
rbuFinalize(p, pStmt);
|
|
rbuObjIterCacheIndexedCols(p, pIter);
|
|
assert( pIter->eType!=RBU_PK_VTAB || pIter->abIndexed==0 );
|
|
}
|
|
|
|
return p->rc;
|
|
}
|
|
|
|
/*
|
|
** This function constructs and returns a pointer to a nul-terminated
|
|
** string containing some SQL clause or list based on one or more of the
|
|
** column names currently stored in the pIter->azTblCol[] array.
|
|
*/
|
|
static char *rbuObjIterGetCollist(
|
|
sqlite3rbu *p, /* RBU object */
|
|
RbuObjIter *pIter /* Object iterator for column names */
|
|
){
|
|
char *zList = 0;
|
|
const char *zSep = "";
|
|
int i;
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
const char *z = pIter->azTblCol[i];
|
|
zList = rbuMPrintf(p, "%z%s\"%w\"", zList, zSep, z);
|
|
zSep = ", ";
|
|
}
|
|
return zList;
|
|
}
|
|
|
|
/*
|
|
** This function is used to create a SELECT list (the list of SQL
|
|
** expressions that follows a SELECT keyword) for a SELECT statement
|
|
** used to read from an data_xxx or rbu_tmp_xxx table while updating the
|
|
** index object currently indicated by the iterator object passed as the
|
|
** second argument. A "PRAGMA index_xinfo = <idxname>" statement is used
|
|
** to obtain the required information.
|
|
**
|
|
** If the index is of the following form:
|
|
**
|
|
** CREATE INDEX i1 ON t1(c, b COLLATE nocase);
|
|
**
|
|
** and "t1" is a table with an explicit INTEGER PRIMARY KEY column
|
|
** "ipk", the returned string is:
|
|
**
|
|
** "`c` COLLATE 'BINARY', `b` COLLATE 'NOCASE', `ipk` COLLATE 'BINARY'"
|
|
**
|
|
** As well as the returned string, three other malloc'd strings are
|
|
** returned via output parameters. As follows:
|
|
**
|
|
** pzImposterCols: ...
|
|
** pzImposterPk: ...
|
|
** pzWhere: ...
|
|
*/
|
|
static char *rbuObjIterGetIndexCols(
|
|
sqlite3rbu *p, /* RBU object */
|
|
RbuObjIter *pIter, /* Object iterator for column names */
|
|
char **pzImposterCols, /* OUT: Columns for imposter table */
|
|
char **pzImposterPk, /* OUT: Imposter PK clause */
|
|
char **pzWhere, /* OUT: WHERE clause */
|
|
int *pnBind /* OUT: Trbul number of columns */
|
|
){
|
|
int rc = p->rc; /* Error code */
|
|
int rc2; /* sqlite3_finalize() return code */
|
|
char *zRet = 0; /* String to return */
|
|
char *zImpCols = 0; /* String to return via *pzImposterCols */
|
|
char *zImpPK = 0; /* String to return via *pzImposterPK */
|
|
char *zWhere = 0; /* String to return via *pzWhere */
|
|
int nBind = 0; /* Value to return via *pnBind */
|
|
const char *zCom = ""; /* Set to ", " later on */
|
|
const char *zAnd = ""; /* Set to " AND " later on */
|
|
sqlite3_stmt *pXInfo = 0; /* PRAGMA index_xinfo = ? */
|
|
|
|
if( rc==SQLITE_OK ){
|
|
assert( p->zErrmsg==0 );
|
|
rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", pIter->zIdx)
|
|
);
|
|
}
|
|
|
|
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
|
|
int iCid = sqlite3_column_int(pXInfo, 1);
|
|
int bDesc = sqlite3_column_int(pXInfo, 3);
|
|
const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
|
|
const char *zCol;
|
|
const char *zType;
|
|
|
|
if( iCid<0 ){
|
|
/* An integer primary key. If the table has an explicit IPK, use
|
|
** its name. Otherwise, use "rbu_rowid". */
|
|
if( pIter->eType==RBU_PK_IPK ){
|
|
int i;
|
|
for(i=0; pIter->abTblPk[i]==0; i++);
|
|
assert( i<pIter->nTblCol );
|
|
zCol = pIter->azTblCol[i];
|
|
}else{
|
|
zCol = "rbu_rowid";
|
|
}
|
|
zType = "INTEGER";
|
|
}else{
|
|
zCol = pIter->azTblCol[iCid];
|
|
zType = pIter->azTblType[iCid];
|
|
}
|
|
|
|
zRet = sqlite3_mprintf("%z%s\"%w\" COLLATE %Q", zRet, zCom, zCol, zCollate);
|
|
if( pIter->bUnique==0 || sqlite3_column_int(pXInfo, 5) ){
|
|
const char *zOrder = (bDesc ? " DESC" : "");
|
|
zImpPK = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\"%s",
|
|
zImpPK, zCom, nBind, zCol, zOrder
|
|
);
|
|
}
|
|
zImpCols = sqlite3_mprintf("%z%s\"rbu_imp_%d%w\" %s COLLATE %Q",
|
|
zImpCols, zCom, nBind, zCol, zType, zCollate
|
|
);
|
|
zWhere = sqlite3_mprintf(
|
|
"%z%s\"rbu_imp_%d%w\" IS ?", zWhere, zAnd, nBind, zCol
|
|
);
|
|
if( zRet==0 || zImpPK==0 || zImpCols==0 || zWhere==0 ) rc = SQLITE_NOMEM;
|
|
zCom = ", ";
|
|
zAnd = " AND ";
|
|
nBind++;
|
|
}
|
|
|
|
rc2 = sqlite3_finalize(pXInfo);
|
|
if( rc==SQLITE_OK ) rc = rc2;
|
|
|
|
if( rc!=SQLITE_OK ){
|
|
sqlite3_free(zRet);
|
|
sqlite3_free(zImpCols);
|
|
sqlite3_free(zImpPK);
|
|
sqlite3_free(zWhere);
|
|
zRet = 0;
|
|
zImpCols = 0;
|
|
zImpPK = 0;
|
|
zWhere = 0;
|
|
p->rc = rc;
|
|
}
|
|
|
|
*pzImposterCols = zImpCols;
|
|
*pzImposterPk = zImpPK;
|
|
*pzWhere = zWhere;
|
|
*pnBind = nBind;
|
|
return zRet;
|
|
}
|
|
|
|
/*
|
|
** Assuming the current table columns are "a", "b" and "c", and the zObj
|
|
** paramter is passed "old", return a string of the form:
|
|
**
|
|
** "old.a, old.b, old.b"
|
|
**
|
|
** With the column names escaped.
|
|
**
|
|
** For tables with implicit rowids - RBU_PK_EXTERNAL and RBU_PK_NONE, append
|
|
** the text ", old._rowid_" to the returned value.
|
|
*/
|
|
static char *rbuObjIterGetOldlist(
|
|
sqlite3rbu *p,
|
|
RbuObjIter *pIter,
|
|
const char *zObj
|
|
){
|
|
char *zList = 0;
|
|
if( p->rc==SQLITE_OK && pIter->abIndexed ){
|
|
const char *zS = "";
|
|
int i;
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
if( pIter->abIndexed[i] ){
|
|
const char *zCol = pIter->azTblCol[i];
|
|
zList = sqlite3_mprintf("%z%s%s.\"%w\"", zList, zS, zObj, zCol);
|
|
}else{
|
|
zList = sqlite3_mprintf("%z%sNULL", zList, zS);
|
|
}
|
|
zS = ", ";
|
|
if( zList==0 ){
|
|
p->rc = SQLITE_NOMEM;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* For a table with implicit rowids, append "old._rowid_" to the list. */
|
|
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
|
|
zList = rbuMPrintf(p, "%z, %s._rowid_", zList, zObj);
|
|
}
|
|
}
|
|
return zList;
|
|
}
|
|
|
|
/*
|
|
** Return an expression that can be used in a WHERE clause to match the
|
|
** primary key of the current table. For example, if the table is:
|
|
**
|
|
** CREATE TABLE t1(a, b, c, PRIMARY KEY(b, c));
|
|
**
|
|
** Return the string:
|
|
**
|
|
** "b = ?1 AND c = ?2"
|
|
*/
|
|
static char *rbuObjIterGetWhere(
|
|
sqlite3rbu *p,
|
|
RbuObjIter *pIter
|
|
){
|
|
char *zList = 0;
|
|
if( pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE ){
|
|
zList = rbuMPrintf(p, "_rowid_ = ?%d", pIter->nTblCol+1);
|
|
}else if( pIter->eType==RBU_PK_EXTERNAL ){
|
|
const char *zSep = "";
|
|
int i;
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
if( pIter->abTblPk[i] ){
|
|
zList = rbuMPrintf(p, "%z%sc%d=?%d", zList, zSep, i, i+1);
|
|
zSep = " AND ";
|
|
}
|
|
}
|
|
zList = rbuMPrintf(p,
|
|
"_rowid_ = (SELECT id FROM rbu_imposter2 WHERE %z)", zList
|
|
);
|
|
|
|
}else{
|
|
const char *zSep = "";
|
|
int i;
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
if( pIter->abTblPk[i] ){
|
|
const char *zCol = pIter->azTblCol[i];
|
|
zList = rbuMPrintf(p, "%z%s\"%w\"=?%d", zList, zSep, zCol, i+1);
|
|
zSep = " AND ";
|
|
}
|
|
}
|
|
}
|
|
return zList;
|
|
}
|
|
|
|
/*
|
|
** The SELECT statement iterating through the keys for the current object
|
|
** (p->objiter.pSelect) currently points to a valid row. However, there
|
|
** is something wrong with the rbu_control value in the rbu_control value
|
|
** stored in the (p->nCol+1)'th column. Set the error code and error message
|
|
** of the RBU handle to something reflecting this.
|
|
*/
|
|
static void rbuBadControlError(sqlite3rbu *p){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("invalid rbu_control value");
|
|
}
|
|
|
|
|
|
/*
|
|
** Return a nul-terminated string containing the comma separated list of
|
|
** assignments that should be included following the "SET" keyword of
|
|
** an UPDATE statement used to update the table object that the iterator
|
|
** passed as the second argument currently points to if the rbu_control
|
|
** column of the data_xxx table entry is set to zMask.
|
|
**
|
|
** The memory for the returned string is obtained from sqlite3_malloc().
|
|
** It is the responsibility of the caller to eventually free it using
|
|
** sqlite3_free().
|
|
**
|
|
** If an OOM error is encountered when allocating space for the new
|
|
** string, an error code is left in the rbu handle passed as the first
|
|
** argument and NULL is returned. Or, if an error has already occurred
|
|
** when this function is called, NULL is returned immediately, without
|
|
** attempting the allocation or modifying the stored error code.
|
|
*/
|
|
static char *rbuObjIterGetSetlist(
|
|
sqlite3rbu *p,
|
|
RbuObjIter *pIter,
|
|
const char *zMask
|
|
){
|
|
char *zList = 0;
|
|
if( p->rc==SQLITE_OK ){
|
|
int i;
|
|
|
|
if( (int)strlen(zMask)!=pIter->nTblCol ){
|
|
rbuBadControlError(p);
|
|
}else{
|
|
const char *zSep = "";
|
|
for(i=0; i<pIter->nTblCol; i++){
|
|
char c = zMask[pIter->aiSrcOrder[i]];
|
|
if( c=='x' ){
|
|
zList = rbuMPrintf(p, "%z%s\"%w\"=?%d",
|
|
zList, zSep, pIter->azTblCol[i], i+1
|
|
);
|
|
zSep = ", ";
|
|
}
|
|
else if( c=='d' ){
|
|
zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_delta(\"%w\", ?%d)",
|
|
zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
|
|
);
|
|
zSep = ", ";
|
|
}
|
|
else if( c=='f' ){
|
|
zList = rbuMPrintf(p, "%z%s\"%w\"=rbu_fossil_delta(\"%w\", ?%d)",
|
|
zList, zSep, pIter->azTblCol[i], pIter->azTblCol[i], i+1
|
|
);
|
|
zSep = ", ";
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return zList;
|
|
}
|
|
|
|
/*
|
|
** Return a nul-terminated string consisting of nByte comma separated
|
|
** "?" expressions. For example, if nByte is 3, return a pointer to
|
|
** a buffer containing the string "?,?,?".
|
|
**
|
|
** The memory for the returned string is obtained from sqlite3_malloc().
|
|
** It is the responsibility of the caller to eventually free it using
|
|
** sqlite3_free().
|
|
**
|
|
** If an OOM error is encountered when allocating space for the new
|
|
** string, an error code is left in the rbu handle passed as the first
|
|
** argument and NULL is returned. Or, if an error has already occurred
|
|
** when this function is called, NULL is returned immediately, without
|
|
** attempting the allocation or modifying the stored error code.
|
|
*/
|
|
static char *rbuObjIterGetBindlist(sqlite3rbu *p, int nBind){
|
|
char *zRet = 0;
|
|
int nByte = nBind*2 + 1;
|
|
|
|
zRet = (char*)rbuMalloc(p, nByte);
|
|
if( zRet ){
|
|
int i;
|
|
for(i=0; i<nBind; i++){
|
|
zRet[i*2] = '?';
|
|
zRet[i*2+1] = (i+1==nBind) ? '\0' : ',';
|
|
}
|
|
}
|
|
return zRet;
|
|
}
|
|
|
|
/*
|
|
** The iterator currently points to a table (not index) of type
|
|
** RBU_PK_WITHOUT_ROWID. This function creates the PRIMARY KEY
|
|
** declaration for the corresponding imposter table. For example,
|
|
** if the iterator points to a table created as:
|
|
**
|
|
** CREATE TABLE t1(a, b, c, PRIMARY KEY(b, a DESC)) WITHOUT ROWID
|
|
**
|
|
** this function returns:
|
|
**
|
|
** PRIMARY KEY("b", "a" DESC)
|
|
*/
|
|
static char *rbuWithoutRowidPK(sqlite3rbu *p, RbuObjIter *pIter){
|
|
char *z = 0;
|
|
assert( pIter->zIdx==0 );
|
|
if( p->rc==SQLITE_OK ){
|
|
const char *zSep = "PRIMARY KEY(";
|
|
sqlite3_stmt *pXList = 0; /* PRAGMA index_list = (pIter->zTbl) */
|
|
sqlite3_stmt *pXInfo = 0; /* PRAGMA index_xinfo = <pk-index> */
|
|
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pXList, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_list = %Q", pIter->zTbl)
|
|
);
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXList) ){
|
|
const char *zOrig = (const char*)sqlite3_column_text(pXList,3);
|
|
if( zOrig && strcmp(zOrig, "pk")==0 ){
|
|
const char *zIdx = (const char*)sqlite3_column_text(pXList,1);
|
|
if( zIdx ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
rbuFinalize(p, pXList);
|
|
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
|
|
if( sqlite3_column_int(pXInfo, 5) ){
|
|
/* int iCid = sqlite3_column_int(pXInfo, 0); */
|
|
const char *zCol = (const char*)sqlite3_column_text(pXInfo, 2);
|
|
const char *zDesc = sqlite3_column_int(pXInfo, 3) ? " DESC" : "";
|
|
z = rbuMPrintf(p, "%z%s\"%w\"%s", z, zSep, zCol, zDesc);
|
|
zSep = ", ";
|
|
}
|
|
}
|
|
z = rbuMPrintf(p, "%z)", z);
|
|
rbuFinalize(p, pXInfo);
|
|
}
|
|
return z;
|
|
}
|
|
|
|
/*
|
|
** This function creates the second imposter table used when writing to
|
|
** a table b-tree where the table has an external primary key. If the
|
|
** iterator passed as the second argument does not currently point to
|
|
** a table (not index) with an external primary key, this function is a
|
|
** no-op.
|
|
**
|
|
** Assuming the iterator does point to a table with an external PK, this
|
|
** function creates a WITHOUT ROWID imposter table named "rbu_imposter2"
|
|
** used to access that PK index. For example, if the target table is
|
|
** declared as follows:
|
|
**
|
|
** CREATE TABLE t1(a, b TEXT, c REAL, PRIMARY KEY(b, c));
|
|
**
|
|
** then the imposter table schema is:
|
|
**
|
|
** CREATE TABLE rbu_imposter2(c1 TEXT, c2 REAL, id INTEGER) WITHOUT ROWID;
|
|
**
|
|
*/
|
|
static void rbuCreateImposterTable2(sqlite3rbu *p, RbuObjIter *pIter){
|
|
if( p->rc==SQLITE_OK && pIter->eType==RBU_PK_EXTERNAL ){
|
|
int tnum = pIter->iPkTnum; /* Root page of PK index */
|
|
sqlite3_stmt *pQuery = 0; /* SELECT name ... WHERE rootpage = $tnum */
|
|
const char *zIdx = 0; /* Name of PK index */
|
|
sqlite3_stmt *pXInfo = 0; /* PRAGMA main.index_xinfo = $zIdx */
|
|
const char *zComma = "";
|
|
char *zCols = 0; /* Used to build up list of table cols */
|
|
char *zPk = 0; /* Used to build up table PK declaration */
|
|
|
|
/* Figure out the name of the primary key index for the current table.
|
|
** This is needed for the argument to "PRAGMA index_xinfo". Set
|
|
** zIdx to point to a nul-terminated string containing this name. */
|
|
p->rc = prepareAndCollectError(p->dbMain, &pQuery, &p->zErrmsg,
|
|
"SELECT name FROM sqlite_master WHERE rootpage = ?"
|
|
);
|
|
if( p->rc==SQLITE_OK ){
|
|
sqlite3_bind_int(pQuery, 1, tnum);
|
|
if( SQLITE_ROW==sqlite3_step(pQuery) ){
|
|
zIdx = (const char*)sqlite3_column_text(pQuery, 0);
|
|
}
|
|
}
|
|
if( zIdx ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pXInfo, &p->zErrmsg,
|
|
sqlite3_mprintf("PRAGMA main.index_xinfo = %Q", zIdx)
|
|
);
|
|
}
|
|
rbuFinalize(p, pQuery);
|
|
|
|
while( p->rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pXInfo) ){
|
|
int bKey = sqlite3_column_int(pXInfo, 5);
|
|
if( bKey ){
|
|
int iCid = sqlite3_column_int(pXInfo, 1);
|
|
int bDesc = sqlite3_column_int(pXInfo, 3);
|
|
const char *zCollate = (const char*)sqlite3_column_text(pXInfo, 4);
|
|
zCols = rbuMPrintf(p, "%z%sc%d %s COLLATE %s", zCols, zComma,
|
|
iCid, pIter->azTblType[iCid], zCollate
|
|
);
|
|
zPk = rbuMPrintf(p, "%z%sc%d%s", zPk, zComma, iCid, bDesc?" DESC":"");
|
|
zComma = ", ";
|
|
}
|
|
}
|
|
zCols = rbuMPrintf(p, "%z, id INTEGER", zCols);
|
|
rbuFinalize(p, pXInfo);
|
|
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
|
|
rbuMPrintfExec(p, p->dbMain,
|
|
"CREATE TABLE rbu_imposter2(%z, PRIMARY KEY(%z)) WITHOUT ROWID",
|
|
zCols, zPk
|
|
);
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** If an error has already occurred when this function is called, it
|
|
** immediately returns zero (without doing any work). Or, if an error
|
|
** occurs during the execution of this function, it sets the error code
|
|
** in the sqlite3rbu object indicated by the first argument and returns
|
|
** zero.
|
|
**
|
|
** The iterator passed as the second argument is guaranteed to point to
|
|
** a table (not an index) when this function is called. This function
|
|
** attempts to create any imposter table required to write to the main
|
|
** table b-tree of the table before returning. Non-zero is returned if
|
|
** an imposter table are created, or zero otherwise.
|
|
**
|
|
** An imposter table is required in all cases except RBU_PK_VTAB. Only
|
|
** virtual tables are written to directly. The imposter table has the
|
|
** same schema as the actual target table (less any UNIQUE constraints).
|
|
** More precisely, the "same schema" means the same columns, types,
|
|
** collation sequences. For tables that do not have an external PRIMARY
|
|
** KEY, it also means the same PRIMARY KEY declaration.
|
|
*/
|
|
static void rbuCreateImposterTable(sqlite3rbu *p, RbuObjIter *pIter){
|
|
if( p->rc==SQLITE_OK && pIter->eType!=RBU_PK_VTAB ){
|
|
int tnum = pIter->iTnum;
|
|
const char *zComma = "";
|
|
char *zSql = 0;
|
|
int iCol;
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
|
|
|
|
for(iCol=0; p->rc==SQLITE_OK && iCol<pIter->nTblCol; iCol++){
|
|
const char *zPk = "";
|
|
const char *zCol = pIter->azTblCol[iCol];
|
|
const char *zColl = 0;
|
|
|
|
p->rc = sqlite3_table_column_metadata(
|
|
p->dbMain, "main", pIter->zTbl, zCol, 0, &zColl, 0, 0, 0
|
|
);
|
|
|
|
if( pIter->eType==RBU_PK_IPK && pIter->abTblPk[iCol] ){
|
|
/* If the target table column is an "INTEGER PRIMARY KEY", add
|
|
** "PRIMARY KEY" to the imposter table column declaration. */
|
|
zPk = "PRIMARY KEY ";
|
|
}
|
|
zSql = rbuMPrintf(p, "%z%s\"%w\" %s %sCOLLATE %s%s",
|
|
zSql, zComma, zCol, pIter->azTblType[iCol], zPk, zColl,
|
|
(pIter->abNotNull[iCol] ? " NOT NULL" : "")
|
|
);
|
|
zComma = ", ";
|
|
}
|
|
|
|
if( pIter->eType==RBU_PK_WITHOUT_ROWID ){
|
|
char *zPk = rbuWithoutRowidPK(p, pIter);
|
|
if( zPk ){
|
|
zSql = rbuMPrintf(p, "%z, %z", zSql, zPk);
|
|
}
|
|
}
|
|
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1, tnum);
|
|
rbuMPrintfExec(p, p->dbMain, "CREATE TABLE \"rbu_imp_%w\"(%z)%s",
|
|
pIter->zTbl, zSql,
|
|
(pIter->eType==RBU_PK_WITHOUT_ROWID ? " WITHOUT ROWID" : "")
|
|
);
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Prepare a statement used to insert rows into the "rbu_tmp_xxx" table.
|
|
** Specifically a statement of the form:
|
|
**
|
|
** INSERT INTO rbu_tmp_xxx VALUES(?, ?, ? ...);
|
|
**
|
|
** The number of bound variables is equal to the number of columns in
|
|
** the target table, plus one (for the rbu_control column), plus one more
|
|
** (for the rbu_rowid column) if the target table is an implicit IPK or
|
|
** virtual table.
|
|
*/
|
|
static void rbuObjIterPrepareTmpInsert(
|
|
sqlite3rbu *p,
|
|
RbuObjIter *pIter,
|
|
const char *zCollist,
|
|
const char *zRbuRowid
|
|
){
|
|
int bRbuRowid = (pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE);
|
|
char *zBind = rbuObjIterGetBindlist(p, pIter->nTblCol + 1 + bRbuRowid);
|
|
if( zBind ){
|
|
assert( pIter->pTmpInsert==0 );
|
|
p->rc = prepareFreeAndCollectError(
|
|
p->dbRbu, &pIter->pTmpInsert, &p->zErrmsg, sqlite3_mprintf(
|
|
"INSERT INTO %s.'rbu_tmp_%q'(rbu_control,%s%s) VALUES(%z)",
|
|
p->zStateDb, pIter->zDataTbl, zCollist, zRbuRowid, zBind
|
|
));
|
|
}
|
|
}
|
|
|
|
static void rbuTmpInsertFunc(
|
|
sqlite3_context *pCtx,
|
|
int nVal,
|
|
sqlite3_value **apVal
|
|
){
|
|
sqlite3rbu *p = sqlite3_user_data(pCtx);
|
|
int rc = SQLITE_OK;
|
|
int i;
|
|
|
|
for(i=0; rc==SQLITE_OK && i<nVal; i++){
|
|
rc = sqlite3_bind_value(p->objiter.pTmpInsert, i+1, apVal[i]);
|
|
}
|
|
if( rc==SQLITE_OK ){
|
|
sqlite3_step(p->objiter.pTmpInsert);
|
|
rc = sqlite3_reset(p->objiter.pTmpInsert);
|
|
}
|
|
|
|
if( rc!=SQLITE_OK ){
|
|
sqlite3_result_error_code(pCtx, rc);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Ensure that the SQLite statement handles required to update the
|
|
** target database object currently indicated by the iterator passed
|
|
** as the second argument are available.
|
|
*/
|
|
static int rbuObjIterPrepareAll(
|
|
sqlite3rbu *p,
|
|
RbuObjIter *pIter,
|
|
int nOffset /* Add "LIMIT -1 OFFSET $nOffset" to SELECT */
|
|
){
|
|
assert( pIter->bCleanup==0 );
|
|
if( pIter->pSelect==0 && rbuObjIterCacheTableInfo(p, pIter)==SQLITE_OK ){
|
|
const int tnum = pIter->iTnum;
|
|
char *zCollist = 0; /* List of indexed columns */
|
|
char **pz = &p->zErrmsg;
|
|
const char *zIdx = pIter->zIdx;
|
|
char *zLimit = 0;
|
|
|
|
if( nOffset ){
|
|
zLimit = sqlite3_mprintf(" LIMIT -1 OFFSET %d", nOffset);
|
|
if( !zLimit ) p->rc = SQLITE_NOMEM;
|
|
}
|
|
|
|
if( zIdx ){
|
|
const char *zTbl = pIter->zTbl;
|
|
char *zImposterCols = 0; /* Columns for imposter table */
|
|
char *zImposterPK = 0; /* Primary key declaration for imposter */
|
|
char *zWhere = 0; /* WHERE clause on PK columns */
|
|
char *zBind = 0;
|
|
int nBind = 0;
|
|
|
|
assert( pIter->eType!=RBU_PK_VTAB );
|
|
zCollist = rbuObjIterGetIndexCols(
|
|
p, pIter, &zImposterCols, &zImposterPK, &zWhere, &nBind
|
|
);
|
|
zBind = rbuObjIterGetBindlist(p, nBind);
|
|
|
|
/* Create the imposter table used to write to this index. */
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 1);
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 1,tnum);
|
|
rbuMPrintfExec(p, p->dbMain,
|
|
"CREATE TABLE \"rbu_imp_%w\"( %s, PRIMARY KEY( %s ) ) WITHOUT ROWID",
|
|
zTbl, zImposterCols, zImposterPK
|
|
);
|
|
sqlite3_test_control(SQLITE_TESTCTRL_IMPOSTER, p->dbMain, "main", 0, 0);
|
|
|
|
/* Create the statement to insert index entries */
|
|
pIter->nCol = nBind;
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(
|
|
p->dbMain, &pIter->pInsert, &p->zErrmsg,
|
|
sqlite3_mprintf("INSERT INTO \"rbu_imp_%w\" VALUES(%s)", zTbl, zBind)
|
|
);
|
|
}
|
|
|
|
/* And to delete index entries */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(
|
|
p->dbMain, &pIter->pDelete, &p->zErrmsg,
|
|
sqlite3_mprintf("DELETE FROM \"rbu_imp_%w\" WHERE %s", zTbl, zWhere)
|
|
);
|
|
}
|
|
|
|
/* Create the SELECT statement to read keys in sorted order */
|
|
if( p->rc==SQLITE_OK ){
|
|
char *zSql;
|
|
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
|
|
zSql = sqlite3_mprintf(
|
|
"SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' ORDER BY %s%s",
|
|
zCollist, p->zStateDb, pIter->zDataTbl,
|
|
zCollist, zLimit
|
|
);
|
|
}else{
|
|
zSql = sqlite3_mprintf(
|
|
"SELECT %s, rbu_control FROM '%q' "
|
|
"WHERE typeof(rbu_control)='integer' AND rbu_control!=1 "
|
|
"UNION ALL "
|
|
"SELECT %s, rbu_control FROM %s.'rbu_tmp_%q' "
|
|
"ORDER BY %s%s",
|
|
zCollist, pIter->zDataTbl,
|
|
zCollist, p->zStateDb, pIter->zDataTbl,
|
|
zCollist, zLimit
|
|
);
|
|
}
|
|
p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz, zSql);
|
|
}
|
|
|
|
sqlite3_free(zImposterCols);
|
|
sqlite3_free(zImposterPK);
|
|
sqlite3_free(zWhere);
|
|
sqlite3_free(zBind);
|
|
}else{
|
|
int bRbuRowid = (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE);
|
|
const char *zTbl = pIter->zTbl; /* Table this step applies to */
|
|
const char *zWrite; /* Imposter table name */
|
|
|
|
char *zBindings = rbuObjIterGetBindlist(p, pIter->nTblCol + bRbuRowid);
|
|
char *zWhere = rbuObjIterGetWhere(p, pIter);
|
|
char *zOldlist = rbuObjIterGetOldlist(p, pIter, "old");
|
|
char *zNewlist = rbuObjIterGetOldlist(p, pIter, "new");
|
|
|
|
zCollist = rbuObjIterGetCollist(p, pIter);
|
|
pIter->nCol = pIter->nTblCol;
|
|
|
|
/* Create the imposter table or tables (if required). */
|
|
rbuCreateImposterTable(p, pIter);
|
|
rbuCreateImposterTable2(p, pIter);
|
|
zWrite = (pIter->eType==RBU_PK_VTAB ? "" : "rbu_imp_");
|
|
|
|
/* Create the INSERT statement to write to the target PK b-tree */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pInsert, pz,
|
|
sqlite3_mprintf(
|
|
"INSERT INTO \"%s%w\"(%s%s) VALUES(%s)",
|
|
zWrite, zTbl, zCollist, (bRbuRowid ? ", _rowid_" : ""), zBindings
|
|
)
|
|
);
|
|
}
|
|
|
|
/* Create the DELETE statement to write to the target PK b-tree */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(p->dbMain, &pIter->pDelete, pz,
|
|
sqlite3_mprintf(
|
|
"DELETE FROM \"%s%w\" WHERE %s", zWrite, zTbl, zWhere
|
|
)
|
|
);
|
|
}
|
|
|
|
if( pIter->abIndexed ){
|
|
const char *zRbuRowid = "";
|
|
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
|
|
zRbuRowid = ", rbu_rowid";
|
|
}
|
|
|
|
/* Create the rbu_tmp_xxx table and the triggers to populate it. */
|
|
rbuMPrintfExec(p, p->dbRbu,
|
|
"CREATE TABLE IF NOT EXISTS %s.'rbu_tmp_%q' AS "
|
|
"SELECT *%s FROM '%q' WHERE 0;"
|
|
, p->zStateDb, pIter->zDataTbl
|
|
, (pIter->eType==RBU_PK_EXTERNAL ? ", 0 AS rbu_rowid" : "")
|
|
, pIter->zDataTbl
|
|
);
|
|
|
|
rbuMPrintfExec(p, p->dbMain,
|
|
"CREATE TEMP TRIGGER rbu_delete_tr BEFORE DELETE ON \"%s%w\" "
|
|
"BEGIN "
|
|
" SELECT rbu_tmp_insert(2, %s);"
|
|
"END;"
|
|
|
|
"CREATE TEMP TRIGGER rbu_update1_tr BEFORE UPDATE ON \"%s%w\" "
|
|
"BEGIN "
|
|
" SELECT rbu_tmp_insert(2, %s);"
|
|
"END;"
|
|
|
|
"CREATE TEMP TRIGGER rbu_update2_tr AFTER UPDATE ON \"%s%w\" "
|
|
"BEGIN "
|
|
" SELECT rbu_tmp_insert(3, %s);"
|
|
"END;",
|
|
zWrite, zTbl, zOldlist,
|
|
zWrite, zTbl, zOldlist,
|
|
zWrite, zTbl, zNewlist
|
|
);
|
|
|
|
if( pIter->eType==RBU_PK_EXTERNAL || pIter->eType==RBU_PK_NONE ){
|
|
rbuMPrintfExec(p, p->dbMain,
|
|
"CREATE TEMP TRIGGER rbu_insert_tr AFTER INSERT ON \"%s%w\" "
|
|
"BEGIN "
|
|
" SELECT rbu_tmp_insert(0, %s);"
|
|
"END;",
|
|
zWrite, zTbl, zNewlist
|
|
);
|
|
}
|
|
|
|
rbuObjIterPrepareTmpInsert(p, pIter, zCollist, zRbuRowid);
|
|
}
|
|
|
|
/* Create the SELECT statement to read keys from data_xxx */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = prepareFreeAndCollectError(p->dbRbu, &pIter->pSelect, pz,
|
|
sqlite3_mprintf(
|
|
"SELECT %s, rbu_control%s FROM '%q'%s",
|
|
zCollist, (bRbuRowid ? ", rbu_rowid" : ""),
|
|
pIter->zDataTbl, zLimit
|
|
)
|
|
);
|
|
}
|
|
|
|
sqlite3_free(zWhere);
|
|
sqlite3_free(zOldlist);
|
|
sqlite3_free(zNewlist);
|
|
sqlite3_free(zBindings);
|
|
}
|
|
sqlite3_free(zCollist);
|
|
sqlite3_free(zLimit);
|
|
}
|
|
|
|
return p->rc;
|
|
}
|
|
|
|
/*
|
|
** Set output variable *ppStmt to point to an UPDATE statement that may
|
|
** be used to update the imposter table for the main table b-tree of the
|
|
** table object that pIter currently points to, assuming that the
|
|
** rbu_control column of the data_xyz table contains zMask.
|
|
**
|
|
** If the zMask string does not specify any columns to update, then this
|
|
** is not an error. Output variable *ppStmt is set to NULL in this case.
|
|
*/
|
|
static int rbuGetUpdateStmt(
|
|
sqlite3rbu *p, /* RBU handle */
|
|
RbuObjIter *pIter, /* Object iterator */
|
|
const char *zMask, /* rbu_control value ('x.x.') */
|
|
sqlite3_stmt **ppStmt /* OUT: UPDATE statement handle */
|
|
){
|
|
RbuUpdateStmt **pp;
|
|
RbuUpdateStmt *pUp = 0;
|
|
int nUp = 0;
|
|
|
|
/* In case an error occurs */
|
|
*ppStmt = 0;
|
|
|
|
/* Search for an existing statement. If one is found, shift it to the front
|
|
** of the LRU queue and return immediately. Otherwise, leave nUp pointing
|
|
** to the number of statements currently in the cache and pUp to the
|
|
** last object in the list. */
|
|
for(pp=&pIter->pRbuUpdate; *pp; pp=&((*pp)->pNext)){
|
|
pUp = *pp;
|
|
if( strcmp(pUp->zMask, zMask)==0 ){
|
|
*pp = pUp->pNext;
|
|
pUp->pNext = pIter->pRbuUpdate;
|
|
pIter->pRbuUpdate = pUp;
|
|
*ppStmt = pUp->pUpdate;
|
|
return SQLITE_OK;
|
|
}
|
|
nUp++;
|
|
}
|
|
assert( pUp==0 || pUp->pNext==0 );
|
|
|
|
if( nUp>=SQLITE_RBU_UPDATE_CACHESIZE ){
|
|
for(pp=&pIter->pRbuUpdate; *pp!=pUp; pp=&((*pp)->pNext));
|
|
*pp = 0;
|
|
sqlite3_finalize(pUp->pUpdate);
|
|
pUp->pUpdate = 0;
|
|
}else{
|
|
pUp = (RbuUpdateStmt*)rbuMalloc(p, sizeof(RbuUpdateStmt)+pIter->nTblCol+1);
|
|
}
|
|
|
|
if( pUp ){
|
|
char *zWhere = rbuObjIterGetWhere(p, pIter);
|
|
char *zSet = rbuObjIterGetSetlist(p, pIter, zMask);
|
|
char *zUpdate = 0;
|
|
|
|
pUp->zMask = (char*)&pUp[1];
|
|
memcpy(pUp->zMask, zMask, pIter->nTblCol);
|
|
pUp->pNext = pIter->pRbuUpdate;
|
|
pIter->pRbuUpdate = pUp;
|
|
|
|
if( zSet ){
|
|
const char *zPrefix = "";
|
|
|
|
if( pIter->eType!=RBU_PK_VTAB ) zPrefix = "rbu_imp_";
|
|
zUpdate = sqlite3_mprintf("UPDATE \"%s%w\" SET %s WHERE %s",
|
|
zPrefix, pIter->zTbl, zSet, zWhere
|
|
);
|
|
p->rc = prepareFreeAndCollectError(
|
|
p->dbMain, &pUp->pUpdate, &p->zErrmsg, zUpdate
|
|
);
|
|
*ppStmt = pUp->pUpdate;
|
|
}
|
|
sqlite3_free(zWhere);
|
|
sqlite3_free(zSet);
|
|
}
|
|
|
|
return p->rc;
|
|
}
|
|
|
|
static sqlite3 *rbuOpenDbhandle(sqlite3rbu *p, const char *zName){
|
|
sqlite3 *db = 0;
|
|
if( p->rc==SQLITE_OK ){
|
|
const int flags = SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE|SQLITE_OPEN_URI;
|
|
p->rc = sqlite3_open_v2(zName, &db, flags, p->zVfsName);
|
|
if( p->rc ){
|
|
p->zErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db));
|
|
sqlite3_close(db);
|
|
db = 0;
|
|
}
|
|
}
|
|
return db;
|
|
}
|
|
|
|
/*
|
|
** Open the database handle and attach the RBU database as "rbu". If an
|
|
** error occurs, leave an error code and message in the RBU handle.
|
|
*/
|
|
static void rbuOpenDatabase(sqlite3rbu *p){
|
|
assert( p->rc==SQLITE_OK );
|
|
assert( p->dbMain==0 && p->dbRbu==0 );
|
|
|
|
p->eStage = 0;
|
|
p->dbMain = rbuOpenDbhandle(p, p->zTarget);
|
|
p->dbRbu = rbuOpenDbhandle(p, p->zRbu);
|
|
|
|
/* If using separate RBU and state databases, attach the state database to
|
|
** the RBU db handle now. */
|
|
if( p->zState ){
|
|
rbuMPrintfExec(p, p->dbRbu, "ATTACH %Q AS stat", p->zState);
|
|
memcpy(p->zStateDb, "stat", 4);
|
|
}else{
|
|
memcpy(p->zStateDb, "main", 4);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_create_function(p->dbMain,
|
|
"rbu_tmp_insert", -1, SQLITE_UTF8, (void*)p, rbuTmpInsertFunc, 0, 0
|
|
);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_create_function(p->dbMain,
|
|
"rbu_fossil_delta", 2, SQLITE_UTF8, 0, rbuFossilDeltaFunc, 0, 0
|
|
);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_create_function(p->dbRbu,
|
|
"rbu_target_name", 1, SQLITE_UTF8, (void*)p, rbuTargetNameFunc, 0, 0
|
|
);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
|
|
}
|
|
rbuMPrintfExec(p, p->dbMain, "SELECT * FROM sqlite_master");
|
|
|
|
/* Mark the database file just opened as an RBU target database. If
|
|
** this call returns SQLITE_NOTFOUND, then the RBU vfs is not in use.
|
|
** This is an error. */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_file_control(p->dbMain, "main", SQLITE_FCNTL_RBU, (void*)p);
|
|
}
|
|
|
|
if( p->rc==SQLITE_NOTFOUND ){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("rbu vfs not found");
|
|
}
|
|
}
|
|
|
|
/*
|
|
** This routine is a copy of the sqlite3FileSuffix3() routine from the core.
|
|
** It is a no-op unless SQLITE_ENABLE_8_3_NAMES is defined.
|
|
**
|
|
** If SQLITE_ENABLE_8_3_NAMES is set at compile-time and if the database
|
|
** filename in zBaseFilename is a URI with the "8_3_names=1" parameter and
|
|
** if filename in z[] has a suffix (a.k.a. "extension") that is longer than
|
|
** three characters, then shorten the suffix on z[] to be the last three
|
|
** characters of the original suffix.
|
|
**
|
|
** If SQLITE_ENABLE_8_3_NAMES is set to 2 at compile-time, then always
|
|
** do the suffix shortening regardless of URI parameter.
|
|
**
|
|
** Examples:
|
|
**
|
|
** test.db-journal => test.nal
|
|
** test.db-wal => test.wal
|
|
** test.db-shm => test.shm
|
|
** test.db-mj7f3319fa => test.9fa
|
|
*/
|
|
static void rbuFileSuffix3(const char *zBase, char *z){
|
|
#ifdef SQLITE_ENABLE_8_3_NAMES
|
|
#if SQLITE_ENABLE_8_3_NAMES<2
|
|
if( sqlite3_uri_boolean(zBase, "8_3_names", 0) )
|
|
#endif
|
|
{
|
|
int i, sz;
|
|
sz = sqlite3Strlen30(z);
|
|
for(i=sz-1; i>0 && z[i]!='/' && z[i]!='.'; i--){}
|
|
if( z[i]=='.' && ALWAYS(sz>i+4) ) memmove(&z[i+1], &z[sz-3], 4);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
** Return the current wal-index header checksum for the target database
|
|
** as a 64-bit integer.
|
|
**
|
|
** The checksum is store in the first page of xShmMap memory as an 8-byte
|
|
** blob starting at byte offset 40.
|
|
*/
|
|
static i64 rbuShmChecksum(sqlite3rbu *p){
|
|
i64 iRet = 0;
|
|
if( p->rc==SQLITE_OK ){
|
|
sqlite3_file *pDb = p->pTargetFd->pReal;
|
|
u32 volatile *ptr;
|
|
p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, (void volatile**)&ptr);
|
|
if( p->rc==SQLITE_OK ){
|
|
iRet = ((i64)ptr[10] << 32) + ptr[11];
|
|
}
|
|
}
|
|
return iRet;
|
|
}
|
|
|
|
/*
|
|
** This function is called as part of initializing or reinitializing an
|
|
** incremental checkpoint.
|
|
**
|
|
** It populates the sqlite3rbu.aFrame[] array with the set of
|
|
** (wal frame -> db page) copy operations required to checkpoint the
|
|
** current wal file, and obtains the set of shm locks required to safely
|
|
** perform the copy operations directly on the file-system.
|
|
**
|
|
** If argument pState is not NULL, then the incremental checkpoint is
|
|
** being resumed. In this case, if the checksum of the wal-index-header
|
|
** following recovery is not the same as the checksum saved in the RbuState
|
|
** object, then the rbu handle is set to DONE state. This occurs if some
|
|
** other client appends a transaction to the wal file in the middle of
|
|
** an incremental checkpoint.
|
|
*/
|
|
static void rbuSetupCheckpoint(sqlite3rbu *p, RbuState *pState){
|
|
|
|
/* If pState is NULL, then the wal file may not have been opened and
|
|
** recovered. Running a read-statement here to ensure that doing so
|
|
** does not interfere with the "capture" process below. */
|
|
if( pState==0 ){
|
|
p->eStage = 0;
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_exec(p->dbMain, "SELECT * FROM sqlite_master", 0, 0, 0);
|
|
}
|
|
}
|
|
|
|
/* Assuming no error has occurred, run a "restart" checkpoint with the
|
|
** sqlite3rbu.eStage variable set to CAPTURE. This turns on the following
|
|
** special behaviour in the rbu VFS:
|
|
**
|
|
** * If the exclusive shm WRITER or READ0 lock cannot be obtained,
|
|
** the checkpoint fails with SQLITE_BUSY (normally SQLite would
|
|
** proceed with running a passive checkpoint instead of failing).
|
|
**
|
|
** * Attempts to read from the *-wal file or write to the database file
|
|
** do not perform any IO. Instead, the frame/page combinations that
|
|
** would be read/written are recorded in the sqlite3rbu.aFrame[]
|
|
** array.
|
|
**
|
|
** * Calls to xShmLock(UNLOCK) to release the exclusive shm WRITER,
|
|
** READ0 and CHECKPOINT locks taken as part of the checkpoint are
|
|
** no-ops. These locks will not be released until the connection
|
|
** is closed.
|
|
**
|
|
** * Attempting to xSync() the database file causes an SQLITE_INTERNAL
|
|
** error.
|
|
**
|
|
** As a result, unless an error (i.e. OOM or SQLITE_BUSY) occurs, the
|
|
** checkpoint below fails with SQLITE_INTERNAL, and leaves the aFrame[]
|
|
** array populated with a set of (frame -> page) mappings. Because the
|
|
** WRITER, CHECKPOINT and READ0 locks are still held, it is safe to copy
|
|
** data from the wal file into the database file according to the
|
|
** contents of aFrame[].
|
|
*/
|
|
if( p->rc==SQLITE_OK ){
|
|
int rc2;
|
|
p->eStage = RBU_STAGE_CAPTURE;
|
|
rc2 = sqlite3_exec(p->dbMain, "PRAGMA main.wal_checkpoint=restart", 0, 0,0);
|
|
if( rc2!=SQLITE_INTERNAL ) p->rc = rc2;
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->eStage = RBU_STAGE_CKPT;
|
|
p->nStep = (pState ? pState->nRow : 0);
|
|
p->aBuf = rbuMalloc(p, p->pgsz);
|
|
p->iWalCksum = rbuShmChecksum(p);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK && pState && pState->iWalCksum!=p->iWalCksum ){
|
|
p->rc = SQLITE_DONE;
|
|
p->eStage = RBU_STAGE_DONE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Called when iAmt bytes are read from offset iOff of the wal file while
|
|
** the rbu object is in capture mode. Record the frame number of the frame
|
|
** being read in the aFrame[] array.
|
|
*/
|
|
static int rbuCaptureWalRead(sqlite3rbu *pRbu, i64 iOff, int iAmt){
|
|
const u32 mReq = (1<<WAL_LOCK_WRITE)|(1<<WAL_LOCK_CKPT)|(1<<WAL_LOCK_READ0);
|
|
u32 iFrame;
|
|
|
|
if( pRbu->mLock!=mReq ){
|
|
pRbu->rc = SQLITE_BUSY;
|
|
return SQLITE_INTERNAL;
|
|
}
|
|
|
|
pRbu->pgsz = iAmt;
|
|
if( pRbu->nFrame==pRbu->nFrameAlloc ){
|
|
int nNew = (pRbu->nFrameAlloc ? pRbu->nFrameAlloc : 64) * 2;
|
|
RbuFrame *aNew;
|
|
aNew = (RbuFrame*)sqlite3_realloc64(pRbu->aFrame, nNew * sizeof(RbuFrame));
|
|
if( aNew==0 ) return SQLITE_NOMEM;
|
|
pRbu->aFrame = aNew;
|
|
pRbu->nFrameAlloc = nNew;
|
|
}
|
|
|
|
iFrame = (u32)((iOff-32) / (i64)(iAmt+24)) + 1;
|
|
if( pRbu->iMaxFrame<iFrame ) pRbu->iMaxFrame = iFrame;
|
|
pRbu->aFrame[pRbu->nFrame].iWalFrame = iFrame;
|
|
pRbu->aFrame[pRbu->nFrame].iDbPage = 0;
|
|
pRbu->nFrame++;
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** Called when a page of data is written to offset iOff of the database
|
|
** file while the rbu handle is in capture mode. Record the page number
|
|
** of the page being written in the aFrame[] array.
|
|
*/
|
|
static int rbuCaptureDbWrite(sqlite3rbu *pRbu, i64 iOff){
|
|
pRbu->aFrame[pRbu->nFrame-1].iDbPage = (u32)(iOff / pRbu->pgsz) + 1;
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
/*
|
|
** This is called as part of an incremental checkpoint operation. Copy
|
|
** a single frame of data from the wal file into the database file, as
|
|
** indicated by the RbuFrame object.
|
|
*/
|
|
static void rbuCheckpointFrame(sqlite3rbu *p, RbuFrame *pFrame){
|
|
sqlite3_file *pWal = p->pTargetFd->pWalFd->pReal;
|
|
sqlite3_file *pDb = p->pTargetFd->pReal;
|
|
i64 iOff;
|
|
|
|
assert( p->rc==SQLITE_OK );
|
|
iOff = (i64)(pFrame->iWalFrame-1) * (p->pgsz + 24) + 32 + 24;
|
|
p->rc = pWal->pMethods->xRead(pWal, p->aBuf, p->pgsz, iOff);
|
|
if( p->rc ) return;
|
|
|
|
iOff = (i64)(pFrame->iDbPage-1) * p->pgsz;
|
|
p->rc = pDb->pMethods->xWrite(pDb, p->aBuf, p->pgsz, iOff);
|
|
}
|
|
|
|
|
|
/*
|
|
** Take an EXCLUSIVE lock on the database file.
|
|
*/
|
|
static void rbuLockDatabase(sqlite3rbu *p){
|
|
sqlite3_file *pReal = p->pTargetFd->pReal;
|
|
assert( p->rc==SQLITE_OK );
|
|
p->rc = pReal->pMethods->xLock(pReal, SQLITE_LOCK_SHARED);
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = pReal->pMethods->xLock(pReal, SQLITE_LOCK_EXCLUSIVE);
|
|
}
|
|
}
|
|
|
|
#if defined(_WIN32_WCE)
|
|
static LPWSTR rbuWinUtf8ToUnicode(const char *zFilename){
|
|
int nChar;
|
|
LPWSTR zWideFilename;
|
|
|
|
nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, NULL, 0);
|
|
if( nChar==0 ){
|
|
return 0;
|
|
}
|
|
zWideFilename = sqlite3_malloc64( nChar*sizeof(zWideFilename[0]) );
|
|
if( zWideFilename==0 ){
|
|
return 0;
|
|
}
|
|
memset(zWideFilename, 0, nChar*sizeof(zWideFilename[0]));
|
|
nChar = MultiByteToWideChar(CP_UTF8, 0, zFilename, -1, zWideFilename,
|
|
nChar);
|
|
if( nChar==0 ){
|
|
sqlite3_free(zWideFilename);
|
|
zWideFilename = 0;
|
|
}
|
|
return zWideFilename;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
** The RBU handle is currently in RBU_STAGE_OAL state, with a SHARED lock
|
|
** on the database file. This proc moves the *-oal file to the *-wal path,
|
|
** then reopens the database file (this time in vanilla, non-oal, WAL mode).
|
|
** If an error occurs, leave an error code and error message in the rbu
|
|
** handle.
|
|
*/
|
|
static void rbuMoveOalFile(sqlite3rbu *p){
|
|
const char *zBase = sqlite3_db_filename(p->dbMain, "main");
|
|
|
|
char *zWal = sqlite3_mprintf("%s-wal", zBase);
|
|
char *zOal = sqlite3_mprintf("%s-oal", zBase);
|
|
|
|
assert( p->eStage==RBU_STAGE_MOVE );
|
|
assert( p->rc==SQLITE_OK && p->zErrmsg==0 );
|
|
if( zWal==0 || zOal==0 ){
|
|
p->rc = SQLITE_NOMEM;
|
|
}else{
|
|
/* Move the *-oal file to *-wal. At this point connection p->db is
|
|
** holding a SHARED lock on the target database file (because it is
|
|
** in WAL mode). So no other connection may be writing the db.
|
|
**
|
|
** In order to ensure that there are no database readers, an EXCLUSIVE
|
|
** lock is obtained here before the *-oal is moved to *-wal.
|
|
*/
|
|
rbuLockDatabase(p);
|
|
if( p->rc==SQLITE_OK ){
|
|
rbuFileSuffix3(zBase, zWal);
|
|
rbuFileSuffix3(zBase, zOal);
|
|
|
|
/* Re-open the databases. */
|
|
rbuObjIterFinalize(&p->objiter);
|
|
sqlite3_close(p->dbMain);
|
|
sqlite3_close(p->dbRbu);
|
|
p->dbMain = 0;
|
|
p->dbRbu = 0;
|
|
|
|
#if defined(_WIN32_WCE)
|
|
{
|
|
LPWSTR zWideOal;
|
|
LPWSTR zWideWal;
|
|
|
|
zWideOal = rbuWinUtf8ToUnicode(zOal);
|
|
if( zWideOal ){
|
|
zWideWal = rbuWinUtf8ToUnicode(zWal);
|
|
if( zWideWal ){
|
|
if( MoveFileW(zWideOal, zWideWal) ){
|
|
p->rc = SQLITE_OK;
|
|
}else{
|
|
p->rc = SQLITE_IOERR;
|
|
}
|
|
sqlite3_free(zWideWal);
|
|
}else{
|
|
p->rc = SQLITE_IOERR_NOMEM;
|
|
}
|
|
sqlite3_free(zWideOal);
|
|
}else{
|
|
p->rc = SQLITE_IOERR_NOMEM;
|
|
}
|
|
}
|
|
#else
|
|
p->rc = rename(zOal, zWal) ? SQLITE_IOERR : SQLITE_OK;
|
|
#endif
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
rbuOpenDatabase(p);
|
|
rbuSetupCheckpoint(p, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
sqlite3_free(zWal);
|
|
sqlite3_free(zOal);
|
|
}
|
|
|
|
/*
|
|
** The SELECT statement iterating through the keys for the current object
|
|
** (p->objiter.pSelect) currently points to a valid row. This function
|
|
** determines the type of operation requested by this row and returns
|
|
** one of the following values to indicate the result:
|
|
**
|
|
** * RBU_INSERT
|
|
** * RBU_DELETE
|
|
** * RBU_IDX_DELETE
|
|
** * RBU_UPDATE
|
|
**
|
|
** If RBU_UPDATE is returned, then output variable *pzMask is set to
|
|
** point to the text value indicating the columns to update.
|
|
**
|
|
** If the rbu_control field contains an invalid value, an error code and
|
|
** message are left in the RBU handle and zero returned.
|
|
*/
|
|
static int rbuStepType(sqlite3rbu *p, const char **pzMask){
|
|
int iCol = p->objiter.nCol; /* Index of rbu_control column */
|
|
int res = 0; /* Return value */
|
|
|
|
switch( sqlite3_column_type(p->objiter.pSelect, iCol) ){
|
|
case SQLITE_INTEGER: {
|
|
int iVal = sqlite3_column_int(p->objiter.pSelect, iCol);
|
|
if( iVal==0 ){
|
|
res = RBU_INSERT;
|
|
}else if( iVal==1 ){
|
|
res = RBU_DELETE;
|
|
}else if( iVal==2 ){
|
|
res = RBU_IDX_DELETE;
|
|
}else if( iVal==3 ){
|
|
res = RBU_IDX_INSERT;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SQLITE_TEXT: {
|
|
const unsigned char *z = sqlite3_column_text(p->objiter.pSelect, iCol);
|
|
if( z==0 ){
|
|
p->rc = SQLITE_NOMEM;
|
|
}else{
|
|
*pzMask = (const char*)z;
|
|
}
|
|
res = RBU_UPDATE;
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if( res==0 ){
|
|
rbuBadControlError(p);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
#ifdef SQLITE_DEBUG
|
|
/*
|
|
** Assert that column iCol of statement pStmt is named zName.
|
|
*/
|
|
static void assertColumnName(sqlite3_stmt *pStmt, int iCol, const char *zName){
|
|
const char *zCol = sqlite3_column_name(pStmt, iCol);
|
|
assert( 0==sqlite3_stricmp(zName, zCol) );
|
|
}
|
|
#else
|
|
# define assertColumnName(x,y,z)
|
|
#endif
|
|
|
|
/*
|
|
** This function does the work for an sqlite3rbu_step() call.
|
|
**
|
|
** The object-iterator (p->objiter) currently points to a valid object,
|
|
** and the input cursor (p->objiter.pSelect) currently points to a valid
|
|
** input row. Perform whatever processing is required and return.
|
|
**
|
|
** If no error occurs, SQLITE_OK is returned. Otherwise, an error code
|
|
** and message is left in the RBU handle and a copy of the error code
|
|
** returned.
|
|
*/
|
|
static int rbuStep(sqlite3rbu *p){
|
|
RbuObjIter *pIter = &p->objiter;
|
|
const char *zMask = 0;
|
|
int i;
|
|
int eType = rbuStepType(p, &zMask);
|
|
|
|
if( eType ){
|
|
assert( eType!=RBU_UPDATE || pIter->zIdx==0 );
|
|
|
|
if( pIter->zIdx==0 && eType==RBU_IDX_DELETE ){
|
|
rbuBadControlError(p);
|
|
}
|
|
else if(
|
|
eType==RBU_INSERT
|
|
|| eType==RBU_DELETE
|
|
|| eType==RBU_IDX_DELETE
|
|
|| eType==RBU_IDX_INSERT
|
|
){
|
|
sqlite3_value *pVal;
|
|
sqlite3_stmt *pWriter;
|
|
|
|
assert( eType!=RBU_UPDATE );
|
|
assert( eType!=RBU_DELETE || pIter->zIdx==0 );
|
|
|
|
if( eType==RBU_IDX_DELETE || eType==RBU_DELETE ){
|
|
pWriter = pIter->pDelete;
|
|
}else{
|
|
pWriter = pIter->pInsert;
|
|
}
|
|
|
|
for(i=0; i<pIter->nCol; i++){
|
|
/* If this is an INSERT into a table b-tree and the table has an
|
|
** explicit INTEGER PRIMARY KEY, check that this is not an attempt
|
|
** to write a NULL into the IPK column. That is not permitted. */
|
|
if( eType==RBU_INSERT
|
|
&& pIter->zIdx==0 && pIter->eType==RBU_PK_IPK && pIter->abTblPk[i]
|
|
&& sqlite3_column_type(pIter->pSelect, i)==SQLITE_NULL
|
|
){
|
|
p->rc = SQLITE_MISMATCH;
|
|
p->zErrmsg = sqlite3_mprintf("datatype mismatch");
|
|
goto step_out;
|
|
}
|
|
|
|
if( eType==RBU_DELETE && pIter->abTblPk[i]==0 ){
|
|
continue;
|
|
}
|
|
|
|
pVal = sqlite3_column_value(pIter->pSelect, i);
|
|
p->rc = sqlite3_bind_value(pWriter, i+1, pVal);
|
|
if( p->rc ) goto step_out;
|
|
}
|
|
if( pIter->zIdx==0
|
|
&& (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
|
|
){
|
|
/* For a virtual table, or a table with no primary key, the
|
|
** SELECT statement is:
|
|
**
|
|
** SELECT <cols>, rbu_control, rbu_rowid FROM ....
|
|
**
|
|
** Hence column_value(pIter->nCol+1).
|
|
*/
|
|
assertColumnName(pIter->pSelect, pIter->nCol+1, "rbu_rowid");
|
|
pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
|
|
p->rc = sqlite3_bind_value(pWriter, pIter->nCol+1, pVal);
|
|
}
|
|
if( p->rc==SQLITE_OK ){
|
|
sqlite3_step(pWriter);
|
|
p->rc = resetAndCollectError(pWriter, &p->zErrmsg);
|
|
}
|
|
}else{
|
|
sqlite3_value *pVal;
|
|
sqlite3_stmt *pUpdate = 0;
|
|
assert( eType==RBU_UPDATE );
|
|
rbuGetUpdateStmt(p, pIter, zMask, &pUpdate);
|
|
if( pUpdate ){
|
|
for(i=0; p->rc==SQLITE_OK && i<pIter->nCol; i++){
|
|
char c = zMask[pIter->aiSrcOrder[i]];
|
|
pVal = sqlite3_column_value(pIter->pSelect, i);
|
|
if( pIter->abTblPk[i] || c!='.' ){
|
|
p->rc = sqlite3_bind_value(pUpdate, i+1, pVal);
|
|
}
|
|
}
|
|
if( p->rc==SQLITE_OK
|
|
&& (pIter->eType==RBU_PK_VTAB || pIter->eType==RBU_PK_NONE)
|
|
){
|
|
/* Bind the rbu_rowid value to column _rowid_ */
|
|
assertColumnName(pIter->pSelect, pIter->nCol+1, "rbu_rowid");
|
|
pVal = sqlite3_column_value(pIter->pSelect, pIter->nCol+1);
|
|
p->rc = sqlite3_bind_value(pUpdate, pIter->nCol+1, pVal);
|
|
}
|
|
if( p->rc==SQLITE_OK ){
|
|
sqlite3_step(pUpdate);
|
|
p->rc = resetAndCollectError(pUpdate, &p->zErrmsg);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
step_out:
|
|
return p->rc;
|
|
}
|
|
|
|
/*
|
|
** Increment the schema cookie of the main database opened by p->dbMain.
|
|
*/
|
|
static void rbuIncrSchemaCookie(sqlite3rbu *p){
|
|
if( p->rc==SQLITE_OK ){
|
|
int iCookie = 1000000;
|
|
sqlite3_stmt *pStmt;
|
|
|
|
p->rc = prepareAndCollectError(p->dbMain, &pStmt, &p->zErrmsg,
|
|
"PRAGMA schema_version"
|
|
);
|
|
if( p->rc==SQLITE_OK ){
|
|
/* Coverage: it may be that this sqlite3_step() cannot fail. There
|
|
** is already a transaction open, so the prepared statement cannot
|
|
** throw an SQLITE_SCHEMA exception. The only database page the
|
|
** statement reads is page 1, which is guaranteed to be in the cache.
|
|
** And no memory allocations are required. */
|
|
if( SQLITE_ROW==sqlite3_step(pStmt) ){
|
|
iCookie = sqlite3_column_int(pStmt, 0);
|
|
}
|
|
rbuFinalize(p, pStmt);
|
|
}
|
|
if( p->rc==SQLITE_OK ){
|
|
rbuMPrintfExec(p, p->dbMain, "PRAGMA schema_version = %d", iCookie+1);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Update the contents of the rbu_state table within the rbu database. The
|
|
** value stored in the RBU_STATE_STAGE column is eStage. All other values
|
|
** are determined by inspecting the rbu handle passed as the first argument.
|
|
*/
|
|
static void rbuSaveState(sqlite3rbu *p, int eStage){
|
|
if( p->rc==SQLITE_OK || p->rc==SQLITE_DONE ){
|
|
sqlite3_stmt *pInsert = 0;
|
|
int rc;
|
|
|
|
assert( p->zErrmsg==0 );
|
|
rc = prepareFreeAndCollectError(p->dbRbu, &pInsert, &p->zErrmsg,
|
|
sqlite3_mprintf(
|
|
"INSERT OR REPLACE INTO %s.rbu_state(k, v) VALUES "
|
|
"(%d, %d), "
|
|
"(%d, %Q), "
|
|
"(%d, %Q), "
|
|
"(%d, %d), "
|
|
"(%d, %d), "
|
|
"(%d, %lld), "
|
|
"(%d, %lld), "
|
|
"(%d, %lld) ",
|
|
p->zStateDb,
|
|
RBU_STATE_STAGE, eStage,
|
|
RBU_STATE_TBL, p->objiter.zTbl,
|
|
RBU_STATE_IDX, p->objiter.zIdx,
|
|
RBU_STATE_ROW, p->nStep,
|
|
RBU_STATE_PROGRESS, p->nProgress,
|
|
RBU_STATE_CKPT, p->iWalCksum,
|
|
RBU_STATE_COOKIE, (i64)p->pTargetFd->iCookie,
|
|
RBU_STATE_OALSZ, p->iOalSz
|
|
)
|
|
);
|
|
assert( pInsert==0 || rc==SQLITE_OK );
|
|
|
|
if( rc==SQLITE_OK ){
|
|
sqlite3_step(pInsert);
|
|
rc = sqlite3_finalize(pInsert);
|
|
}
|
|
if( rc!=SQLITE_OK ) p->rc = rc;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** Step the RBU object.
|
|
*/
|
|
int sqlite3rbu_step(sqlite3rbu *p){
|
|
if( p ){
|
|
switch( p->eStage ){
|
|
case RBU_STAGE_OAL: {
|
|
RbuObjIter *pIter = &p->objiter;
|
|
while( p->rc==SQLITE_OK && pIter->zTbl ){
|
|
|
|
if( pIter->bCleanup ){
|
|
/* Clean up the rbu_tmp_xxx table for the previous table. It
|
|
** cannot be dropped as there are currently active SQL statements.
|
|
** But the contents can be deleted. */
|
|
if( pIter->abIndexed ){
|
|
rbuMPrintfExec(p, p->dbRbu,
|
|
"DELETE FROM %s.'rbu_tmp_%q'", p->zStateDb, pIter->zDataTbl
|
|
);
|
|
}
|
|
}else{
|
|
rbuObjIterPrepareAll(p, pIter, 0);
|
|
|
|
/* Advance to the next row to process. */
|
|
if( p->rc==SQLITE_OK ){
|
|
int rc = sqlite3_step(pIter->pSelect);
|
|
if( rc==SQLITE_ROW ){
|
|
p->nProgress++;
|
|
p->nStep++;
|
|
return rbuStep(p);
|
|
}
|
|
p->rc = sqlite3_reset(pIter->pSelect);
|
|
p->nStep = 0;
|
|
}
|
|
}
|
|
|
|
rbuObjIterNext(p, pIter);
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
assert( pIter->zTbl==0 );
|
|
rbuSaveState(p, RBU_STAGE_MOVE);
|
|
rbuIncrSchemaCookie(p);
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
|
|
}
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
|
|
}
|
|
p->eStage = RBU_STAGE_MOVE;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case RBU_STAGE_MOVE: {
|
|
if( p->rc==SQLITE_OK ){
|
|
rbuMoveOalFile(p);
|
|
p->nProgress++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case RBU_STAGE_CKPT: {
|
|
if( p->rc==SQLITE_OK ){
|
|
if( p->nStep>=p->nFrame ){
|
|
sqlite3_file *pDb = p->pTargetFd->pReal;
|
|
|
|
/* Sync the db file */
|
|
p->rc = pDb->pMethods->xSync(pDb, SQLITE_SYNC_NORMAL);
|
|
|
|
/* Update nBackfill */
|
|
if( p->rc==SQLITE_OK ){
|
|
void volatile *ptr;
|
|
p->rc = pDb->pMethods->xShmMap(pDb, 0, 32*1024, 0, &ptr);
|
|
if( p->rc==SQLITE_OK ){
|
|
((u32 volatile*)ptr)[24] = p->iMaxFrame;
|
|
}
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
p->eStage = RBU_STAGE_DONE;
|
|
p->rc = SQLITE_DONE;
|
|
}
|
|
}else{
|
|
RbuFrame *pFrame = &p->aFrame[p->nStep];
|
|
rbuCheckpointFrame(p, pFrame);
|
|
p->nStep++;
|
|
}
|
|
p->nProgress++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return p->rc;
|
|
}else{
|
|
return SQLITE_NOMEM;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Free an RbuState object allocated by rbuLoadState().
|
|
*/
|
|
static void rbuFreeState(RbuState *p){
|
|
if( p ){
|
|
sqlite3_free(p->zTbl);
|
|
sqlite3_free(p->zIdx);
|
|
sqlite3_free(p);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Allocate an RbuState object and load the contents of the rbu_state
|
|
** table into it. Return a pointer to the new object. It is the
|
|
** responsibility of the caller to eventually free the object using
|
|
** sqlite3_free().
|
|
**
|
|
** If an error occurs, leave an error code and message in the rbu handle
|
|
** and return NULL.
|
|
*/
|
|
static RbuState *rbuLoadState(sqlite3rbu *p){
|
|
RbuState *pRet = 0;
|
|
sqlite3_stmt *pStmt = 0;
|
|
int rc;
|
|
int rc2;
|
|
|
|
pRet = (RbuState*)rbuMalloc(p, sizeof(RbuState));
|
|
if( pRet==0 ) return 0;
|
|
|
|
rc = prepareFreeAndCollectError(p->dbRbu, &pStmt, &p->zErrmsg,
|
|
sqlite3_mprintf("SELECT k, v FROM %s.rbu_state", p->zStateDb)
|
|
);
|
|
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
|
|
switch( sqlite3_column_int(pStmt, 0) ){
|
|
case RBU_STATE_STAGE:
|
|
pRet->eStage = sqlite3_column_int(pStmt, 1);
|
|
if( pRet->eStage!=RBU_STAGE_OAL
|
|
&& pRet->eStage!=RBU_STAGE_MOVE
|
|
&& pRet->eStage!=RBU_STAGE_CKPT
|
|
){
|
|
p->rc = SQLITE_CORRUPT;
|
|
}
|
|
break;
|
|
|
|
case RBU_STATE_TBL:
|
|
pRet->zTbl = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
|
|
break;
|
|
|
|
case RBU_STATE_IDX:
|
|
pRet->zIdx = rbuStrndup((char*)sqlite3_column_text(pStmt, 1), &rc);
|
|
break;
|
|
|
|
case RBU_STATE_ROW:
|
|
pRet->nRow = sqlite3_column_int(pStmt, 1);
|
|
break;
|
|
|
|
case RBU_STATE_PROGRESS:
|
|
pRet->nProgress = sqlite3_column_int64(pStmt, 1);
|
|
break;
|
|
|
|
case RBU_STATE_CKPT:
|
|
pRet->iWalCksum = sqlite3_column_int64(pStmt, 1);
|
|
break;
|
|
|
|
case RBU_STATE_COOKIE:
|
|
pRet->iCookie = (u32)sqlite3_column_int64(pStmt, 1);
|
|
break;
|
|
|
|
case RBU_STATE_OALSZ:
|
|
pRet->iOalSz = (u32)sqlite3_column_int64(pStmt, 1);
|
|
break;
|
|
|
|
default:
|
|
rc = SQLITE_CORRUPT;
|
|
break;
|
|
}
|
|
}
|
|
rc2 = sqlite3_finalize(pStmt);
|
|
if( rc==SQLITE_OK ) rc = rc2;
|
|
|
|
p->rc = rc;
|
|
return pRet;
|
|
}
|
|
|
|
/*
|
|
** Compare strings z1 and z2, returning 0 if they are identical, or non-zero
|
|
** otherwise. Either or both argument may be NULL. Two NULL values are
|
|
** considered equal, and NULL is considered distinct from all other values.
|
|
*/
|
|
static int rbuStrCompare(const char *z1, const char *z2){
|
|
if( z1==0 && z2==0 ) return 0;
|
|
if( z1==0 || z2==0 ) return 1;
|
|
return (sqlite3_stricmp(z1, z2)!=0);
|
|
}
|
|
|
|
/*
|
|
** This function is called as part of sqlite3rbu_open() when initializing
|
|
** an rbu handle in OAL stage. If the rbu update has not started (i.e.
|
|
** the rbu_state table was empty) it is a no-op. Otherwise, it arranges
|
|
** things so that the next call to sqlite3rbu_step() continues on from
|
|
** where the previous rbu handle left off.
|
|
**
|
|
** If an error occurs, an error code and error message are left in the
|
|
** rbu handle passed as the first argument.
|
|
*/
|
|
static void rbuSetupOal(sqlite3rbu *p, RbuState *pState){
|
|
assert( p->rc==SQLITE_OK );
|
|
if( pState->zTbl ){
|
|
RbuObjIter *pIter = &p->objiter;
|
|
int rc = SQLITE_OK;
|
|
|
|
while( rc==SQLITE_OK && pIter->zTbl && (pIter->bCleanup
|
|
|| rbuStrCompare(pIter->zIdx, pState->zIdx)
|
|
|| rbuStrCompare(pIter->zTbl, pState->zTbl)
|
|
)){
|
|
rc = rbuObjIterNext(p, pIter);
|
|
}
|
|
|
|
if( rc==SQLITE_OK && !pIter->zTbl ){
|
|
rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("rbu_state mismatch error");
|
|
}
|
|
|
|
if( rc==SQLITE_OK ){
|
|
p->nStep = pState->nRow;
|
|
rc = rbuObjIterPrepareAll(p, &p->objiter, p->nStep);
|
|
}
|
|
|
|
p->rc = rc;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** If there is a "*-oal" file in the file-system corresponding to the
|
|
** target database in the file-system, delete it. If an error occurs,
|
|
** leave an error code and error message in the rbu handle.
|
|
*/
|
|
static void rbuDeleteOalFile(sqlite3rbu *p){
|
|
char *zOal = rbuMPrintf(p, "%s-oal", p->zTarget);
|
|
if( zOal ){
|
|
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
|
|
assert( pVfs && p->rc==SQLITE_OK && p->zErrmsg==0 );
|
|
pVfs->xDelete(pVfs, zOal, 0);
|
|
sqlite3_free(zOal);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Allocate a private rbu VFS for the rbu handle passed as the only
|
|
** argument. This VFS will be used unless the call to sqlite3rbu_open()
|
|
** specified a URI with a vfs=? option in place of a target database
|
|
** file name.
|
|
*/
|
|
static void rbuCreateVfs(sqlite3rbu *p){
|
|
int rnd;
|
|
char zRnd[64];
|
|
|
|
assert( p->rc==SQLITE_OK );
|
|
sqlite3_randomness(sizeof(int), (void*)&rnd);
|
|
sqlite3_snprintf(sizeof(zRnd), zRnd, "rbu_vfs_%d", rnd);
|
|
p->rc = sqlite3rbu_create_vfs(zRnd, 0);
|
|
if( p->rc==SQLITE_OK ){
|
|
sqlite3_vfs *pVfs = sqlite3_vfs_find(zRnd);
|
|
assert( pVfs );
|
|
p->zVfsName = pVfs->zName;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Destroy the private VFS created for the rbu handle passed as the only
|
|
** argument by an earlier call to rbuCreateVfs().
|
|
*/
|
|
static void rbuDeleteVfs(sqlite3rbu *p){
|
|
if( p->zVfsName ){
|
|
sqlite3rbu_destroy_vfs(p->zVfsName);
|
|
p->zVfsName = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Open and return a new RBU handle.
|
|
*/
|
|
sqlite3rbu *sqlite3rbu_open(
|
|
const char *zTarget,
|
|
const char *zRbu,
|
|
const char *zState
|
|
){
|
|
sqlite3rbu *p;
|
|
size_t nTarget = strlen(zTarget);
|
|
size_t nRbu = strlen(zRbu);
|
|
size_t nState = zState ? strlen(zState) : 0;
|
|
size_t nByte = sizeof(sqlite3rbu) + nTarget+1 + nRbu+1+ nState+1;
|
|
|
|
p = (sqlite3rbu*)sqlite3_malloc64(nByte);
|
|
if( p ){
|
|
RbuState *pState = 0;
|
|
|
|
/* Create the custom VFS. */
|
|
memset(p, 0, sizeof(sqlite3rbu));
|
|
rbuCreateVfs(p);
|
|
|
|
/* Open the target database */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->zTarget = (char*)&p[1];
|
|
memcpy(p->zTarget, zTarget, nTarget+1);
|
|
p->zRbu = &p->zTarget[nTarget+1];
|
|
memcpy(p->zRbu, zRbu, nRbu+1);
|
|
if( zState ){
|
|
p->zState = &p->zRbu[nRbu+1];
|
|
memcpy(p->zState, zState, nState+1);
|
|
}
|
|
rbuOpenDatabase(p);
|
|
}
|
|
|
|
/* If it has not already been created, create the rbu_state table */
|
|
rbuMPrintfExec(p, p->dbRbu, RBU_CREATE_STATE, p->zStateDb);
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
pState = rbuLoadState(p);
|
|
assert( pState || p->rc!=SQLITE_OK );
|
|
if( p->rc==SQLITE_OK ){
|
|
|
|
if( pState->eStage==0 ){
|
|
rbuDeleteOalFile(p);
|
|
p->eStage = RBU_STAGE_OAL;
|
|
}else{
|
|
p->eStage = pState->eStage;
|
|
}
|
|
p->nProgress = pState->nProgress;
|
|
p->iOalSz = pState->iOalSz;
|
|
}
|
|
}
|
|
assert( p->rc!=SQLITE_OK || p->eStage!=0 );
|
|
|
|
if( p->rc==SQLITE_OK && p->pTargetFd->pWalFd ){
|
|
if( p->eStage==RBU_STAGE_OAL ){
|
|
p->rc = SQLITE_ERROR;
|
|
p->zErrmsg = sqlite3_mprintf("cannot update wal mode database");
|
|
}else if( p->eStage==RBU_STAGE_MOVE ){
|
|
p->eStage = RBU_STAGE_CKPT;
|
|
p->nStep = 0;
|
|
}
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK
|
|
&& (p->eStage==RBU_STAGE_OAL || p->eStage==RBU_STAGE_MOVE)
|
|
&& pState->eStage!=0 && p->pTargetFd->iCookie!=pState->iCookie
|
|
){
|
|
/* At this point (pTargetFd->iCookie) contains the value of the
|
|
** change-counter cookie (the thing that gets incremented when a
|
|
** transaction is committed in rollback mode) currently stored on
|
|
** page 1 of the database file. */
|
|
p->rc = SQLITE_BUSY;
|
|
p->zErrmsg = sqlite3_mprintf("database modified during rbu update");
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
if( p->eStage==RBU_STAGE_OAL ){
|
|
sqlite3 *db = p->dbMain;
|
|
|
|
/* Open transactions both databases. The *-oal file is opened or
|
|
** created at this point. */
|
|
p->rc = sqlite3_exec(db, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = sqlite3_exec(p->dbRbu, "BEGIN IMMEDIATE", 0, 0, &p->zErrmsg);
|
|
}
|
|
|
|
/* Check if the main database is a zipvfs db. If it is, set the upper
|
|
** level pager to use "journal_mode=off". This prevents it from
|
|
** generating a large journal using a temp file. */
|
|
if( p->rc==SQLITE_OK ){
|
|
int frc = sqlite3_file_control(db, "main", SQLITE_FCNTL_ZIPVFS, 0);
|
|
if( frc==SQLITE_OK ){
|
|
p->rc = sqlite3_exec(db, "PRAGMA journal_mode=off",0,0,&p->zErrmsg);
|
|
}
|
|
}
|
|
|
|
/* Point the object iterator at the first object */
|
|
if( p->rc==SQLITE_OK ){
|
|
p->rc = rbuObjIterFirst(p, &p->objiter);
|
|
}
|
|
|
|
/* If the RBU database contains no data_xxx tables, declare the RBU
|
|
** update finished. */
|
|
if( p->rc==SQLITE_OK && p->objiter.zTbl==0 ){
|
|
p->rc = SQLITE_DONE;
|
|
}
|
|
|
|
if( p->rc==SQLITE_OK ){
|
|
rbuSetupOal(p, pState);
|
|
}
|
|
|
|
}else if( p->eStage==RBU_STAGE_MOVE ){
|
|
/* no-op */
|
|
}else if( p->eStage==RBU_STAGE_CKPT ){
|
|
rbuSetupCheckpoint(p, pState);
|
|
}else if( p->eStage==RBU_STAGE_DONE ){
|
|
p->rc = SQLITE_DONE;
|
|
}else{
|
|
p->rc = SQLITE_CORRUPT;
|
|
}
|
|
}
|
|
|
|
rbuFreeState(pState);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
** Return the database handle used by pRbu.
|
|
*/
|
|
sqlite3 *sqlite3rbu_db(sqlite3rbu *pRbu, int bRbu){
|
|
sqlite3 *db = 0;
|
|
if( pRbu ){
|
|
db = (bRbu ? pRbu->dbRbu : pRbu->dbMain);
|
|
}
|
|
return db;
|
|
}
|
|
|
|
|
|
/*
|
|
** If the error code currently stored in the RBU handle is SQLITE_CONSTRAINT,
|
|
** then edit any error message string so as to remove all occurrences of
|
|
** the pattern "rbu_imp_[0-9]*".
|
|
*/
|
|
static void rbuEditErrmsg(sqlite3rbu *p){
|
|
if( p->rc==SQLITE_CONSTRAINT && p->zErrmsg ){
|
|
int i;
|
|
size_t nErrmsg = strlen(p->zErrmsg);
|
|
for(i=0; i<(nErrmsg-8); i++){
|
|
if( memcmp(&p->zErrmsg[i], "rbu_imp_", 8)==0 ){
|
|
int nDel = 8;
|
|
while( p->zErrmsg[i+nDel]>='0' && p->zErrmsg[i+nDel]<='9' ) nDel++;
|
|
memmove(&p->zErrmsg[i], &p->zErrmsg[i+nDel], nErrmsg + 1 - i - nDel);
|
|
nErrmsg -= nDel;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Close the RBU handle.
|
|
*/
|
|
int sqlite3rbu_close(sqlite3rbu *p, char **pzErrmsg){
|
|
int rc;
|
|
if( p ){
|
|
|
|
/* Commit the transaction to the *-oal file. */
|
|
if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
|
|
p->rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, &p->zErrmsg);
|
|
}
|
|
|
|
rbuSaveState(p, p->eStage);
|
|
|
|
if( p->rc==SQLITE_OK && p->eStage==RBU_STAGE_OAL ){
|
|
p->rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, &p->zErrmsg);
|
|
}
|
|
|
|
/* Close any open statement handles. */
|
|
rbuObjIterFinalize(&p->objiter);
|
|
|
|
/* Close the open database handle and VFS object. */
|
|
sqlite3_close(p->dbMain);
|
|
sqlite3_close(p->dbRbu);
|
|
rbuDeleteVfs(p);
|
|
sqlite3_free(p->aBuf);
|
|
sqlite3_free(p->aFrame);
|
|
|
|
rbuEditErrmsg(p);
|
|
rc = p->rc;
|
|
*pzErrmsg = p->zErrmsg;
|
|
sqlite3_free(p);
|
|
}else{
|
|
rc = SQLITE_NOMEM;
|
|
*pzErrmsg = 0;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Return the total number of key-value operations (inserts, deletes or
|
|
** updates) that have been performed on the target database since the
|
|
** current RBU update was started.
|
|
*/
|
|
sqlite3_int64 sqlite3rbu_progress(sqlite3rbu *pRbu){
|
|
return pRbu->nProgress;
|
|
}
|
|
|
|
int sqlite3rbu_savestate(sqlite3rbu *p){
|
|
int rc = p->rc;
|
|
|
|
if( rc==SQLITE_DONE ) return SQLITE_OK;
|
|
|
|
assert( p->eStage>=RBU_STAGE_OAL && p->eStage<=RBU_STAGE_DONE );
|
|
if( p->eStage==RBU_STAGE_OAL ){
|
|
assert( rc!=SQLITE_DONE );
|
|
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "COMMIT", 0, 0, 0);
|
|
}
|
|
|
|
p->rc = rc;
|
|
rbuSaveState(p, p->eStage);
|
|
rc = p->rc;
|
|
|
|
if( p->eStage==RBU_STAGE_OAL ){
|
|
assert( rc!=SQLITE_DONE );
|
|
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbRbu, "COMMIT", 0, 0, 0);
|
|
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbRbu, "BEGIN IMMEDIATE", 0, 0, 0);
|
|
if( rc==SQLITE_OK ) rc = sqlite3_exec(p->dbMain, "BEGIN IMMEDIATE", 0, 0,0);
|
|
}
|
|
|
|
p->rc = rc;
|
|
return rc;
|
|
}
|
|
|
|
/**************************************************************************
|
|
** Beginning of RBU VFS shim methods. The VFS shim modifies the behaviour
|
|
** of a standard VFS in the following ways:
|
|
**
|
|
** 1. Whenever the first page of a main database file is read or
|
|
** written, the value of the change-counter cookie is stored in
|
|
** rbu_file.iCookie. Similarly, the value of the "write-version"
|
|
** database header field is stored in rbu_file.iWriteVer. This ensures
|
|
** that the values are always trustworthy within an open transaction.
|
|
**
|
|
** 2. Whenever an SQLITE_OPEN_WAL file is opened, the (rbu_file.pWalFd)
|
|
** member variable of the associated database file descriptor is set
|
|
** to point to the new file. A mutex protected linked list of all main
|
|
** db fds opened using a particular RBU VFS is maintained at
|
|
** rbu_vfs.pMain to facilitate this.
|
|
**
|
|
** 3. Using a new file-control "SQLITE_FCNTL_RBU", a main db rbu_file
|
|
** object can be marked as the target database of an RBU update. This
|
|
** turns on the following extra special behaviour:
|
|
**
|
|
** 3a. If xAccess() is called to check if there exists a *-wal file
|
|
** associated with an RBU target database currently in RBU_STAGE_OAL
|
|
** stage (preparing the *-oal file), the following special handling
|
|
** applies:
|
|
**
|
|
** * if the *-wal file does exist, return SQLITE_CANTOPEN. An RBU
|
|
** target database may not be in wal mode already.
|
|
**
|
|
** * if the *-wal file does not exist, set the output parameter to
|
|
** non-zero (to tell SQLite that it does exist) anyway.
|
|
**
|
|
** Then, when xOpen() is called to open the *-wal file associated with
|
|
** the RBU target in RBU_STAGE_OAL stage, instead of opening the *-wal
|
|
** file, the rbu vfs opens the corresponding *-oal file instead.
|
|
**
|
|
** 3b. The *-shm pages returned by xShmMap() for a target db file in
|
|
** RBU_STAGE_OAL mode are actually stored in heap memory. This is to
|
|
** avoid creating a *-shm file on disk. Additionally, xShmLock() calls
|
|
** are no-ops on target database files in RBU_STAGE_OAL mode. This is
|
|
** because assert() statements in some VFS implementations fail if
|
|
** xShmLock() is called before xShmMap().
|
|
**
|
|
** 3c. If an EXCLUSIVE lock is attempted on a target database file in any
|
|
** mode except RBU_STAGE_DONE (all work completed and checkpointed), it
|
|
** fails with an SQLITE_BUSY error. This is to stop RBU connections
|
|
** from automatically checkpointing a *-wal (or *-oal) file from within
|
|
** sqlite3_close().
|
|
**
|
|
** 3d. In RBU_STAGE_CAPTURE mode, all xRead() calls on the wal file, and
|
|
** all xWrite() calls on the target database file perform no IO.
|
|
** Instead the frame and page numbers that would be read and written
|
|
** are recorded. Additionally, successful attempts to obtain exclusive
|
|
** xShmLock() WRITER, CHECKPOINTER and READ0 locks on the target
|
|
** database file are recorded. xShmLock() calls to unlock the same
|
|
** locks are no-ops (so that once obtained, these locks are never
|
|
** relinquished). Finally, calls to xSync() on the target database
|
|
** file fail with SQLITE_INTERNAL errors.
|
|
*/
|
|
|
|
static void rbuUnlockShm(rbu_file *p){
|
|
if( p->pRbu ){
|
|
int (*xShmLock)(sqlite3_file*,int,int,int) = p->pReal->pMethods->xShmLock;
|
|
int i;
|
|
for(i=0; i<SQLITE_SHM_NLOCK;i++){
|
|
if( (1<<i) & p->pRbu->mLock ){
|
|
xShmLock(p->pReal, i, 1, SQLITE_SHM_UNLOCK|SQLITE_SHM_EXCLUSIVE);
|
|
}
|
|
}
|
|
p->pRbu->mLock = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Close an rbu file.
|
|
*/
|
|
static int rbuVfsClose(sqlite3_file *pFile){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
int rc;
|
|
int i;
|
|
|
|
/* Free the contents of the apShm[] array. And the array itself. */
|
|
for(i=0; i<p->nShm; i++){
|
|
sqlite3_free(p->apShm[i]);
|
|
}
|
|
sqlite3_free(p->apShm);
|
|
p->apShm = 0;
|
|
sqlite3_free(p->zDel);
|
|
|
|
if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
|
|
rbu_file **pp;
|
|
sqlite3_mutex_enter(p->pRbuVfs->mutex);
|
|
for(pp=&p->pRbuVfs->pMain; *pp!=p; pp=&((*pp)->pMainNext));
|
|
*pp = p->pMainNext;
|
|
sqlite3_mutex_leave(p->pRbuVfs->mutex);
|
|
rbuUnlockShm(p);
|
|
p->pReal->pMethods->xShmUnmap(p->pReal, 0);
|
|
}
|
|
|
|
/* Close the underlying file handle */
|
|
rc = p->pReal->pMethods->xClose(p->pReal);
|
|
return rc;
|
|
}
|
|
|
|
|
|
/*
|
|
** Read and return an unsigned 32-bit big-endian integer from the buffer
|
|
** passed as the only argument.
|
|
*/
|
|
static u32 rbuGetU32(u8 *aBuf){
|
|
return ((u32)aBuf[0] << 24)
|
|
+ ((u32)aBuf[1] << 16)
|
|
+ ((u32)aBuf[2] << 8)
|
|
+ ((u32)aBuf[3]);
|
|
}
|
|
|
|
/*
|
|
** Read data from an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsRead(
|
|
sqlite3_file *pFile,
|
|
void *zBuf,
|
|
int iAmt,
|
|
sqlite_int64 iOfst
|
|
){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
sqlite3rbu *pRbu = p->pRbu;
|
|
int rc;
|
|
|
|
if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
|
|
assert( p->openFlags & SQLITE_OPEN_WAL );
|
|
rc = rbuCaptureWalRead(p->pRbu, iOfst, iAmt);
|
|
}else{
|
|
if( pRbu && pRbu->eStage==RBU_STAGE_OAL
|
|
&& (p->openFlags & SQLITE_OPEN_WAL)
|
|
&& iOfst>=pRbu->iOalSz
|
|
){
|
|
rc = SQLITE_OK;
|
|
memset(zBuf, 0, iAmt);
|
|
}else{
|
|
rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
|
|
}
|
|
if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
|
|
/* These look like magic numbers. But they are stable, as they are part
|
|
** of the definition of the SQLite file format, which may not change. */
|
|
u8 *pBuf = (u8*)zBuf;
|
|
p->iCookie = rbuGetU32(&pBuf[24]);
|
|
p->iWriteVer = pBuf[19];
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Write data to an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsWrite(
|
|
sqlite3_file *pFile,
|
|
const void *zBuf,
|
|
int iAmt,
|
|
sqlite_int64 iOfst
|
|
){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
sqlite3rbu *pRbu = p->pRbu;
|
|
int rc;
|
|
|
|
if( pRbu && pRbu->eStage==RBU_STAGE_CAPTURE ){
|
|
assert( p->openFlags & SQLITE_OPEN_MAIN_DB );
|
|
rc = rbuCaptureDbWrite(p->pRbu, iOfst);
|
|
}else{
|
|
if( pRbu && pRbu->eStage==RBU_STAGE_OAL
|
|
&& (p->openFlags & SQLITE_OPEN_WAL)
|
|
&& iOfst>=pRbu->iOalSz
|
|
){
|
|
pRbu->iOalSz = iAmt + iOfst;
|
|
}
|
|
rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
|
|
if( rc==SQLITE_OK && iOfst==0 && (p->openFlags & SQLITE_OPEN_MAIN_DB) ){
|
|
/* These look like magic numbers. But they are stable, as they are part
|
|
** of the definition of the SQLite file format, which may not change. */
|
|
u8 *pBuf = (u8*)zBuf;
|
|
p->iCookie = rbuGetU32(&pBuf[24]);
|
|
p->iWriteVer = pBuf[19];
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Truncate an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsTruncate(sqlite3_file *pFile, sqlite_int64 size){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
return p->pReal->pMethods->xTruncate(p->pReal, size);
|
|
}
|
|
|
|
/*
|
|
** Sync an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsSync(sqlite3_file *pFile, int flags){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
if( p->pRbu && p->pRbu->eStage==RBU_STAGE_CAPTURE ){
|
|
if( p->openFlags & SQLITE_OPEN_MAIN_DB ){
|
|
return SQLITE_INTERNAL;
|
|
}
|
|
return SQLITE_OK;
|
|
}
|
|
return p->pReal->pMethods->xSync(p->pReal, flags);
|
|
}
|
|
|
|
/*
|
|
** Return the current file-size of an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsFileSize(sqlite3_file *pFile, sqlite_int64 *pSize){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
return p->pReal->pMethods->xFileSize(p->pReal, pSize);
|
|
}
|
|
|
|
/*
|
|
** Lock an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsLock(sqlite3_file *pFile, int eLock){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
sqlite3rbu *pRbu = p->pRbu;
|
|
int rc = SQLITE_OK;
|
|
|
|
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
|
|
if( pRbu && eLock==SQLITE_LOCK_EXCLUSIVE && pRbu->eStage!=RBU_STAGE_DONE ){
|
|
/* Do not allow EXCLUSIVE locks. Preventing SQLite from taking this
|
|
** prevents it from checkpointing the database from sqlite3_close(). */
|
|
rc = SQLITE_BUSY;
|
|
}else{
|
|
rc = p->pReal->pMethods->xLock(p->pReal, eLock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Unlock an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsUnlock(sqlite3_file *pFile, int eLock){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
return p->pReal->pMethods->xUnlock(p->pReal, eLock);
|
|
}
|
|
|
|
/*
|
|
** Check if another file-handle holds a RESERVED lock on an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsCheckReservedLock(sqlite3_file *pFile, int *pResOut){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
return p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
|
|
}
|
|
|
|
/*
|
|
** File control method. For custom operations on an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsFileControl(sqlite3_file *pFile, int op, void *pArg){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
int (*xControl)(sqlite3_file*,int,void*) = p->pReal->pMethods->xFileControl;
|
|
int rc;
|
|
|
|
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB)
|
|
|| p->openFlags & (SQLITE_OPEN_TRANSIENT_DB|SQLITE_OPEN_TEMP_JOURNAL)
|
|
);
|
|
if( op==SQLITE_FCNTL_RBU ){
|
|
sqlite3rbu *pRbu = (sqlite3rbu*)pArg;
|
|
|
|
/* First try to find another RBU vfs lower down in the vfs stack. If
|
|
** one is found, this vfs will operate in pass-through mode. The lower
|
|
** level vfs will do the special RBU handling. */
|
|
rc = xControl(p->pReal, op, pArg);
|
|
|
|
if( rc==SQLITE_NOTFOUND ){
|
|
/* Now search for a zipvfs instance lower down in the VFS stack. If
|
|
** one is found, this is an error. */
|
|
void *dummy = 0;
|
|
rc = xControl(p->pReal, SQLITE_FCNTL_ZIPVFS, &dummy);
|
|
if( rc==SQLITE_OK ){
|
|
rc = SQLITE_ERROR;
|
|
pRbu->zErrmsg = sqlite3_mprintf("rbu/zipvfs setup error");
|
|
}else if( rc==SQLITE_NOTFOUND ){
|
|
pRbu->pTargetFd = p;
|
|
p->pRbu = pRbu;
|
|
if( p->pWalFd ) p->pWalFd->pRbu = pRbu;
|
|
rc = SQLITE_OK;
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
rc = xControl(p->pReal, op, pArg);
|
|
if( rc==SQLITE_OK && op==SQLITE_FCNTL_VFSNAME ){
|
|
rbu_vfs *pRbuVfs = p->pRbuVfs;
|
|
char *zIn = *(char**)pArg;
|
|
char *zOut = sqlite3_mprintf("rbu(%s)/%z", pRbuVfs->base.zName, zIn);
|
|
*(char**)pArg = zOut;
|
|
if( zOut==0 ) rc = SQLITE_NOMEM;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Return the sector-size in bytes for an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsSectorSize(sqlite3_file *pFile){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
return p->pReal->pMethods->xSectorSize(p->pReal);
|
|
}
|
|
|
|
/*
|
|
** Return the device characteristic flags supported by an rbuVfs-file.
|
|
*/
|
|
static int rbuVfsDeviceCharacteristics(sqlite3_file *pFile){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
return p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
|
|
}
|
|
|
|
/*
|
|
** Take or release a shared-memory lock.
|
|
*/
|
|
static int rbuVfsShmLock(sqlite3_file *pFile, int ofst, int n, int flags){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
sqlite3rbu *pRbu = p->pRbu;
|
|
int rc = SQLITE_OK;
|
|
|
|
#ifdef SQLITE_AMALGAMATION
|
|
assert( WAL_CKPT_LOCK==1 );
|
|
#endif
|
|
|
|
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
|
|
if( pRbu && (pRbu->eStage==RBU_STAGE_OAL || pRbu->eStage==RBU_STAGE_MOVE) ){
|
|
/* Magic number 1 is the WAL_CKPT_LOCK lock. Preventing SQLite from
|
|
** taking this lock also prevents any checkpoints from occurring.
|
|
** todo: really, it's not clear why this might occur, as
|
|
** wal_autocheckpoint ought to be turned off. */
|
|
if( ofst==WAL_LOCK_CKPT && n==1 ) rc = SQLITE_BUSY;
|
|
}else{
|
|
int bCapture = 0;
|
|
if( n==1 && (flags & SQLITE_SHM_EXCLUSIVE)
|
|
&& pRbu && pRbu->eStage==RBU_STAGE_CAPTURE
|
|
&& (ofst==WAL_LOCK_WRITE || ofst==WAL_LOCK_CKPT || ofst==WAL_LOCK_READ0)
|
|
){
|
|
bCapture = 1;
|
|
}
|
|
|
|
if( bCapture==0 || 0==(flags & SQLITE_SHM_UNLOCK) ){
|
|
rc = p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags);
|
|
if( bCapture && rc==SQLITE_OK ){
|
|
pRbu->mLock |= (1 << ofst);
|
|
}
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Obtain a pointer to a mapping of a single 32KiB page of the *-shm file.
|
|
*/
|
|
static int rbuVfsShmMap(
|
|
sqlite3_file *pFile,
|
|
int iRegion,
|
|
int szRegion,
|
|
int isWrite,
|
|
void volatile **pp
|
|
){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
int rc = SQLITE_OK;
|
|
int eStage = (p->pRbu ? p->pRbu->eStage : 0);
|
|
|
|
/* If not in RBU_STAGE_OAL, allow this call to pass through. Or, if this
|
|
** rbu is in the RBU_STAGE_OAL state, use heap memory for *-shm space
|
|
** instead of a file on disk. */
|
|
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
|
|
if( eStage==RBU_STAGE_OAL || eStage==RBU_STAGE_MOVE ){
|
|
if( iRegion<=p->nShm ){
|
|
int nByte = (iRegion+1) * sizeof(char*);
|
|
char **apNew = (char**)sqlite3_realloc64(p->apShm, nByte);
|
|
if( apNew==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else{
|
|
memset(&apNew[p->nShm], 0, sizeof(char*) * (1 + iRegion - p->nShm));
|
|
p->apShm = apNew;
|
|
p->nShm = iRegion+1;
|
|
}
|
|
}
|
|
|
|
if( rc==SQLITE_OK && p->apShm[iRegion]==0 ){
|
|
char *pNew = (char*)sqlite3_malloc64(szRegion);
|
|
if( pNew==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else{
|
|
memset(pNew, 0, szRegion);
|
|
p->apShm[iRegion] = pNew;
|
|
}
|
|
}
|
|
|
|
if( rc==SQLITE_OK ){
|
|
*pp = p->apShm[iRegion];
|
|
}else{
|
|
*pp = 0;
|
|
}
|
|
}else{
|
|
assert( p->apShm==0 );
|
|
rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Memory barrier.
|
|
*/
|
|
static void rbuVfsShmBarrier(sqlite3_file *pFile){
|
|
rbu_file *p = (rbu_file *)pFile;
|
|
p->pReal->pMethods->xShmBarrier(p->pReal);
|
|
}
|
|
|
|
/*
|
|
** The xShmUnmap method.
|
|
*/
|
|
static int rbuVfsShmUnmap(sqlite3_file *pFile, int delFlag){
|
|
rbu_file *p = (rbu_file*)pFile;
|
|
int rc = SQLITE_OK;
|
|
int eStage = (p->pRbu ? p->pRbu->eStage : 0);
|
|
|
|
assert( p->openFlags & (SQLITE_OPEN_MAIN_DB|SQLITE_OPEN_TEMP_DB) );
|
|
if( eStage==RBU_STAGE_OAL || eStage==RBU_STAGE_MOVE ){
|
|
/* no-op */
|
|
}else{
|
|
/* Release the checkpointer and writer locks */
|
|
rbuUnlockShm(p);
|
|
rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Given that zWal points to a buffer containing a wal file name passed to
|
|
** either the xOpen() or xAccess() VFS method, return a pointer to the
|
|
** file-handle opened by the same database connection on the corresponding
|
|
** database file.
|
|
*/
|
|
static rbu_file *rbuFindMaindb(rbu_vfs *pRbuVfs, const char *zWal){
|
|
rbu_file *pDb;
|
|
sqlite3_mutex_enter(pRbuVfs->mutex);
|
|
for(pDb=pRbuVfs->pMain; pDb && pDb->zWal!=zWal; pDb=pDb->pMainNext);
|
|
sqlite3_mutex_leave(pRbuVfs->mutex);
|
|
return pDb;
|
|
}
|
|
|
|
/*
|
|
** Open an rbu file handle.
|
|
*/
|
|
static int rbuVfsOpen(
|
|
sqlite3_vfs *pVfs,
|
|
const char *zName,
|
|
sqlite3_file *pFile,
|
|
int flags,
|
|
int *pOutFlags
|
|
){
|
|
static sqlite3_io_methods rbuvfs_io_methods = {
|
|
2, /* iVersion */
|
|
rbuVfsClose, /* xClose */
|
|
rbuVfsRead, /* xRead */
|
|
rbuVfsWrite, /* xWrite */
|
|
rbuVfsTruncate, /* xTruncate */
|
|
rbuVfsSync, /* xSync */
|
|
rbuVfsFileSize, /* xFileSize */
|
|
rbuVfsLock, /* xLock */
|
|
rbuVfsUnlock, /* xUnlock */
|
|
rbuVfsCheckReservedLock, /* xCheckReservedLock */
|
|
rbuVfsFileControl, /* xFileControl */
|
|
rbuVfsSectorSize, /* xSectorSize */
|
|
rbuVfsDeviceCharacteristics, /* xDeviceCharacteristics */
|
|
rbuVfsShmMap, /* xShmMap */
|
|
rbuVfsShmLock, /* xShmLock */
|
|
rbuVfsShmBarrier, /* xShmBarrier */
|
|
rbuVfsShmUnmap, /* xShmUnmap */
|
|
0, 0 /* xFetch, xUnfetch */
|
|
};
|
|
rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
|
|
sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
|
|
rbu_file *pFd = (rbu_file *)pFile;
|
|
int rc = SQLITE_OK;
|
|
const char *zOpen = zName;
|
|
|
|
memset(pFd, 0, sizeof(rbu_file));
|
|
pFd->pReal = (sqlite3_file*)&pFd[1];
|
|
pFd->pRbuVfs = pRbuVfs;
|
|
pFd->openFlags = flags;
|
|
if( zName ){
|
|
if( flags & SQLITE_OPEN_MAIN_DB ){
|
|
/* A main database has just been opened. The following block sets
|
|
** (pFd->zWal) to point to a buffer owned by SQLite that contains
|
|
** the name of the *-wal file this db connection will use. SQLite
|
|
** happens to pass a pointer to this buffer when using xAccess()
|
|
** or xOpen() to operate on the *-wal file. */
|
|
int n = (int)strlen(zName);
|
|
const char *z = &zName[n];
|
|
if( flags & SQLITE_OPEN_URI ){
|
|
int odd = 0;
|
|
while( 1 ){
|
|
if( z[0]==0 ){
|
|
odd = 1 - odd;
|
|
if( odd && z[1]==0 ) break;
|
|
}
|
|
z++;
|
|
}
|
|
z += 2;
|
|
}else{
|
|
while( *z==0 ) z++;
|
|
}
|
|
z += (n + 8 + 1);
|
|
pFd->zWal = z;
|
|
}
|
|
else if( flags & SQLITE_OPEN_WAL ){
|
|
rbu_file *pDb = rbuFindMaindb(pRbuVfs, zName);
|
|
if( pDb ){
|
|
if( pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
|
|
/* This call is to open a *-wal file. Intead, open the *-oal. This
|
|
** code ensures that the string passed to xOpen() is terminated by a
|
|
** pair of '\0' bytes in case the VFS attempts to extract a URI
|
|
** parameter from it. */
|
|
size_t nCopy = strlen(zName);
|
|
char *zCopy = sqlite3_malloc64(nCopy+2);
|
|
if( zCopy ){
|
|
memcpy(zCopy, zName, nCopy);
|
|
zCopy[nCopy-3] = 'o';
|
|
zCopy[nCopy] = '\0';
|
|
zCopy[nCopy+1] = '\0';
|
|
zOpen = (const char*)(pFd->zDel = zCopy);
|
|
}else{
|
|
rc = SQLITE_NOMEM;
|
|
}
|
|
pFd->pRbu = pDb->pRbu;
|
|
}
|
|
pDb->pWalFd = pFd;
|
|
}
|
|
}
|
|
}
|
|
|
|
if( rc==SQLITE_OK ){
|
|
rc = pRealVfs->xOpen(pRealVfs, zOpen, pFd->pReal, flags, pOutFlags);
|
|
}
|
|
if( pFd->pReal->pMethods ){
|
|
/* The xOpen() operation has succeeded. Set the sqlite3_file.pMethods
|
|
** pointer and, if the file is a main database file, link it into the
|
|
** mutex protected linked list of all such files. */
|
|
pFile->pMethods = &rbuvfs_io_methods;
|
|
if( flags & SQLITE_OPEN_MAIN_DB ){
|
|
sqlite3_mutex_enter(pRbuVfs->mutex);
|
|
pFd->pMainNext = pRbuVfs->pMain;
|
|
pRbuVfs->pMain = pFd;
|
|
sqlite3_mutex_leave(pRbuVfs->mutex);
|
|
}
|
|
}else{
|
|
sqlite3_free(pFd->zDel);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Delete the file located at zPath.
|
|
*/
|
|
static int rbuVfsDelete(sqlite3_vfs *pVfs, const char *zPath, int dirSync){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xDelete(pRealVfs, zPath, dirSync);
|
|
}
|
|
|
|
/*
|
|
** Test for access permissions. Return true if the requested permission
|
|
** is available, or false otherwise.
|
|
*/
|
|
static int rbuVfsAccess(
|
|
sqlite3_vfs *pVfs,
|
|
const char *zPath,
|
|
int flags,
|
|
int *pResOut
|
|
){
|
|
rbu_vfs *pRbuVfs = (rbu_vfs*)pVfs;
|
|
sqlite3_vfs *pRealVfs = pRbuVfs->pRealVfs;
|
|
int rc;
|
|
|
|
rc = pRealVfs->xAccess(pRealVfs, zPath, flags, pResOut);
|
|
|
|
/* If this call is to check if a *-wal file associated with an RBU target
|
|
** database connection exists, and the RBU update is in RBU_STAGE_OAL,
|
|
** the following special handling is activated:
|
|
**
|
|
** a) if the *-wal file does exist, return SQLITE_CANTOPEN. This
|
|
** ensures that the RBU extension never tries to update a database
|
|
** in wal mode, even if the first page of the database file has
|
|
** been damaged.
|
|
**
|
|
** b) if the *-wal file does not exist, claim that it does anyway,
|
|
** causing SQLite to call xOpen() to open it. This call will also
|
|
** be intercepted (see the rbuVfsOpen() function) and the *-oal
|
|
** file opened instead.
|
|
*/
|
|
if( rc==SQLITE_OK && flags==SQLITE_ACCESS_EXISTS ){
|
|
rbu_file *pDb = rbuFindMaindb(pRbuVfs, zPath);
|
|
if( pDb && pDb->pRbu && pDb->pRbu->eStage==RBU_STAGE_OAL ){
|
|
if( *pResOut ){
|
|
rc = SQLITE_CANTOPEN;
|
|
}else{
|
|
*pResOut = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
** Populate buffer zOut with the full canonical pathname corresponding
|
|
** to the pathname in zPath. zOut is guaranteed to point to a buffer
|
|
** of at least (DEVSYM_MAX_PATHNAME+1) bytes.
|
|
*/
|
|
static int rbuVfsFullPathname(
|
|
sqlite3_vfs *pVfs,
|
|
const char *zPath,
|
|
int nOut,
|
|
char *zOut
|
|
){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xFullPathname(pRealVfs, zPath, nOut, zOut);
|
|
}
|
|
|
|
#ifndef SQLITE_OMIT_LOAD_EXTENSION
|
|
/*
|
|
** Open the dynamic library located at zPath and return a handle.
|
|
*/
|
|
static void *rbuVfsDlOpen(sqlite3_vfs *pVfs, const char *zPath){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xDlOpen(pRealVfs, zPath);
|
|
}
|
|
|
|
/*
|
|
** Populate the buffer zErrMsg (size nByte bytes) with a human readable
|
|
** utf-8 string describing the most recent error encountered associated
|
|
** with dynamic libraries.
|
|
*/
|
|
static void rbuVfsDlError(sqlite3_vfs *pVfs, int nByte, char *zErrMsg){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
pRealVfs->xDlError(pRealVfs, nByte, zErrMsg);
|
|
}
|
|
|
|
/*
|
|
** Return a pointer to the symbol zSymbol in the dynamic library pHandle.
|
|
*/
|
|
static void (*rbuVfsDlSym(
|
|
sqlite3_vfs *pVfs,
|
|
void *pArg,
|
|
const char *zSym
|
|
))(void){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xDlSym(pRealVfs, pArg, zSym);
|
|
}
|
|
|
|
/*
|
|
** Close the dynamic library handle pHandle.
|
|
*/
|
|
static void rbuVfsDlClose(sqlite3_vfs *pVfs, void *pHandle){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
pRealVfs->xDlClose(pRealVfs, pHandle);
|
|
}
|
|
#endif /* SQLITE_OMIT_LOAD_EXTENSION */
|
|
|
|
/*
|
|
** Populate the buffer pointed to by zBufOut with nByte bytes of
|
|
** random data.
|
|
*/
|
|
static int rbuVfsRandomness(sqlite3_vfs *pVfs, int nByte, char *zBufOut){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xRandomness(pRealVfs, nByte, zBufOut);
|
|
}
|
|
|
|
/*
|
|
** Sleep for nMicro microseconds. Return the number of microseconds
|
|
** actually slept.
|
|
*/
|
|
static int rbuVfsSleep(sqlite3_vfs *pVfs, int nMicro){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xSleep(pRealVfs, nMicro);
|
|
}
|
|
|
|
/*
|
|
** Return the current time as a Julian Day number in *pTimeOut.
|
|
*/
|
|
static int rbuVfsCurrentTime(sqlite3_vfs *pVfs, double *pTimeOut){
|
|
sqlite3_vfs *pRealVfs = ((rbu_vfs*)pVfs)->pRealVfs;
|
|
return pRealVfs->xCurrentTime(pRealVfs, pTimeOut);
|
|
}
|
|
|
|
/*
|
|
** No-op.
|
|
*/
|
|
static int rbuVfsGetLastError(sqlite3_vfs *pVfs, int a, char *b){
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
** Deregister and destroy an RBU vfs created by an earlier call to
|
|
** sqlite3rbu_create_vfs().
|
|
*/
|
|
void sqlite3rbu_destroy_vfs(const char *zName){
|
|
sqlite3_vfs *pVfs = sqlite3_vfs_find(zName);
|
|
if( pVfs && pVfs->xOpen==rbuVfsOpen ){
|
|
sqlite3_mutex_free(((rbu_vfs*)pVfs)->mutex);
|
|
sqlite3_vfs_unregister(pVfs);
|
|
sqlite3_free(pVfs);
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Create an RBU VFS named zName that accesses the underlying file-system
|
|
** via existing VFS zParent. The new object is registered as a non-default
|
|
** VFS with SQLite before returning.
|
|
*/
|
|
int sqlite3rbu_create_vfs(const char *zName, const char *zParent){
|
|
|
|
/* Template for VFS */
|
|
static sqlite3_vfs vfs_template = {
|
|
1, /* iVersion */
|
|
0, /* szOsFile */
|
|
0, /* mxPathname */
|
|
0, /* pNext */
|
|
0, /* zName */
|
|
0, /* pAppData */
|
|
rbuVfsOpen, /* xOpen */
|
|
rbuVfsDelete, /* xDelete */
|
|
rbuVfsAccess, /* xAccess */
|
|
rbuVfsFullPathname, /* xFullPathname */
|
|
|
|
#ifndef SQLITE_OMIT_LOAD_EXTENSION
|
|
rbuVfsDlOpen, /* xDlOpen */
|
|
rbuVfsDlError, /* xDlError */
|
|
rbuVfsDlSym, /* xDlSym */
|
|
rbuVfsDlClose, /* xDlClose */
|
|
#else
|
|
0, 0, 0, 0,
|
|
#endif
|
|
|
|
rbuVfsRandomness, /* xRandomness */
|
|
rbuVfsSleep, /* xSleep */
|
|
rbuVfsCurrentTime, /* xCurrentTime */
|
|
rbuVfsGetLastError, /* xGetLastError */
|
|
0, /* xCurrentTimeInt64 (version 2) */
|
|
0, 0, 0 /* Unimplemented version 3 methods */
|
|
};
|
|
|
|
rbu_vfs *pNew = 0; /* Newly allocated VFS */
|
|
int rc = SQLITE_OK;
|
|
size_t nName;
|
|
size_t nByte;
|
|
|
|
nName = strlen(zName);
|
|
nByte = sizeof(rbu_vfs) + nName + 1;
|
|
pNew = (rbu_vfs*)sqlite3_malloc64(nByte);
|
|
if( pNew==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else{
|
|
sqlite3_vfs *pParent; /* Parent VFS */
|
|
memset(pNew, 0, nByte);
|
|
pParent = sqlite3_vfs_find(zParent);
|
|
if( pParent==0 ){
|
|
rc = SQLITE_NOTFOUND;
|
|
}else{
|
|
char *zSpace;
|
|
memcpy(&pNew->base, &vfs_template, sizeof(sqlite3_vfs));
|
|
pNew->base.mxPathname = pParent->mxPathname;
|
|
pNew->base.szOsFile = sizeof(rbu_file) + pParent->szOsFile;
|
|
pNew->pRealVfs = pParent;
|
|
pNew->base.zName = (const char*)(zSpace = (char*)&pNew[1]);
|
|
memcpy(zSpace, zName, nName);
|
|
|
|
/* Allocate the mutex and register the new VFS (not as the default) */
|
|
pNew->mutex = sqlite3_mutex_alloc(SQLITE_MUTEX_RECURSIVE);
|
|
if( pNew->mutex==0 ){
|
|
rc = SQLITE_NOMEM;
|
|
}else{
|
|
rc = sqlite3_vfs_register(&pNew->base, 0);
|
|
}
|
|
}
|
|
|
|
if( rc!=SQLITE_OK ){
|
|
sqlite3_mutex_free(pNew->mutex);
|
|
sqlite3_free(pNew);
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/**************************************************************************/
|
|
|
|
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_RBU) */
|