706 lines
19 KiB
C++
706 lines
19 KiB
C++
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2022-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
/**
|
|
* @file avro_file.c - File operations for the Avro router
|
|
*
|
|
* This file contains functions that handle the low level file operations for
|
|
* the Avro router. The handling of Avro data files is done via the Avro C API
|
|
* but the handling of MySQL format binary logs is done manually.
|
|
*
|
|
* Parts of this file have been copied from blr_file.c and modified for other
|
|
* uses.
|
|
*/
|
|
|
|
#include "avrorouter.hh"
|
|
#include <maxscale/query_classifier.h>
|
|
|
|
#include <binlog_common.h>
|
|
#include <blr_constants.h>
|
|
#include <glob.h>
|
|
#include <ini.h>
|
|
#include <stdlib.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <maxscale/alloc.h>
|
|
#include <maxscale/log.h>
|
|
#include <maxscale/maxscale.h>
|
|
#include <maxscale/pcre2.h>
|
|
#include <maxscale/utils.h>
|
|
|
|
static const char* statefile_section = "avro-conversion";
|
|
|
|
|
|
/**
|
|
* Open a binlog file for reading
|
|
*
|
|
* @param router The router instance
|
|
* @param file The binlog file name
|
|
*/
|
|
bool avro_open_binlog(const char* binlogdir, const char* file, int* dest)
|
|
{
|
|
char path[PATH_MAX + 1] = "";
|
|
int fd;
|
|
|
|
snprintf(path, sizeof(path), "%s/%s", binlogdir, file);
|
|
|
|
if ((fd = open(path, O_RDONLY)) == -1)
|
|
{
|
|
if (errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to open binlog file %s: %d, %s",
|
|
path,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (lseek(fd, BINLOG_MAGIC_SIZE, SEEK_SET) < 4)
|
|
{
|
|
/* If for any reason the file's length is between 1 and 3 bytes
|
|
* then report an error. */
|
|
MXS_ERROR("Binlog file %s has an invalid length.", path);
|
|
close(fd);
|
|
return false;
|
|
}
|
|
|
|
*dest = fd;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Close a binlog file
|
|
* @param fd Binlog file descriptor
|
|
*/
|
|
void avro_close_binlog(int fd)
|
|
{
|
|
close(fd);
|
|
}
|
|
|
|
/**
|
|
* @brief Write a new ini file with current conversion status
|
|
*
|
|
* The file is stored in the cache directory as 'avro-conversion.ini'.
|
|
* @param router Avro router instance
|
|
* @return True if the file was written successfully to disk
|
|
*
|
|
*/
|
|
bool avro_save_conversion_state(Avro* router)
|
|
{
|
|
FILE* config_file;
|
|
char filename[PATH_MAX + 1];
|
|
|
|
snprintf(filename, sizeof(filename), "%s/" AVRO_PROGRESS_FILE ".tmp", router->avrodir.c_str());
|
|
|
|
/* open file for writing */
|
|
config_file = fopen(filename, "wb");
|
|
|
|
if (config_file == NULL)
|
|
{
|
|
MXS_ERROR("Failed to open file '%s': %d, %s",
|
|
filename,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
gtid_pos_t gtid = router->handler.get_gtid();
|
|
fprintf(config_file, "[%s]\n", statefile_section);
|
|
fprintf(config_file, "position=%lu\n", router->current_pos);
|
|
fprintf(config_file,
|
|
"gtid=%lu-%lu-%lu:%lu\n",
|
|
gtid.domain,
|
|
gtid.server_id,
|
|
gtid.seq,
|
|
gtid.event_num);
|
|
fprintf(config_file, "file=%s\n", router->binlog_name.c_str());
|
|
fclose(config_file);
|
|
|
|
/* rename tmp file to right filename */
|
|
char newname[PATH_MAX + 1];
|
|
snprintf(newname, sizeof(newname), "%s/" AVRO_PROGRESS_FILE, router->avrodir.c_str());
|
|
int rc = rename(filename, newname);
|
|
|
|
if (rc == -1)
|
|
{
|
|
MXS_ERROR("Failed to rename file '%s' to '%s': %d, %s",
|
|
filename,
|
|
newname,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* @brief Callback for the @c ini_parse of the stored conversion position
|
|
*
|
|
* @param data User provided data
|
|
* @param section Section name
|
|
* @param key Parameter name
|
|
* @param value Parameter value
|
|
* @return 1 if the parsing should continue, 0 if an error was detected
|
|
*/
|
|
static int conv_state_handler(void* data, const char* section, const char* key, const char* value)
|
|
{
|
|
Avro* router = (Avro*) data;
|
|
|
|
if (strcmp(section, statefile_section) == 0)
|
|
{
|
|
if (strcmp(key, "gtid") == 0)
|
|
{
|
|
gtid_pos_t gtid;
|
|
MXB_AT_DEBUG(bool rval = ) gtid.parse(value);
|
|
mxb_assert(rval);
|
|
router->handler.set_gtid(gtid);
|
|
}
|
|
else if (strcmp(key, "position") == 0)
|
|
{
|
|
router->current_pos = strtol(value, NULL, 10);
|
|
}
|
|
else if (strcmp(key, "file") == 0)
|
|
{
|
|
size_t len = strlen(value);
|
|
|
|
if (len > BINLOG_FNAMELEN)
|
|
{
|
|
MXS_ERROR("Provided value %s for key 'file' is too long. "
|
|
"The maximum allowed length is %d.",
|
|
value,
|
|
BINLOG_FNAMELEN);
|
|
return 0;
|
|
}
|
|
|
|
router->binlog_name = value;
|
|
}
|
|
else
|
|
{
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* @brief Load a stored conversion state from file
|
|
*
|
|
* @param router Avro router instance
|
|
* @return True if the stored state was loaded successfully
|
|
*/
|
|
bool avro_load_conversion_state(Avro* router)
|
|
{
|
|
char filename[PATH_MAX + 1];
|
|
bool rval = false;
|
|
|
|
snprintf(filename, sizeof(filename), "%s/" AVRO_PROGRESS_FILE, router->avrodir.c_str());
|
|
|
|
/** No stored state, this is the first time the router is started */
|
|
if (access(filename, F_OK) == -1)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
MXS_NOTICE("[%s] Loading stored conversion state: %s", router->service->name, filename);
|
|
|
|
int rc = ini_parse(filename, conv_state_handler, router);
|
|
|
|
switch (rc)
|
|
{
|
|
case 0:
|
|
{
|
|
rval = true;
|
|
gtid_pos_t gtid = router->handler.get_gtid();
|
|
MXS_NOTICE(
|
|
"Loaded stored binary log conversion state: File: [%s] Position: [%ld] GTID: [%lu-%lu-%lu:%lu]",
|
|
router->binlog_name.c_str(),
|
|
router->current_pos,
|
|
gtid.domain,
|
|
gtid.server_id,
|
|
gtid.seq,
|
|
gtid.event_num);
|
|
}
|
|
break;
|
|
|
|
case -1:
|
|
MXS_ERROR("Failed to open file '%s'. ", filename);
|
|
break;
|
|
|
|
case -2:
|
|
MXS_ERROR("Failed to allocate enough memory when parsing file '%s'. ", filename);
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Failed to parse stored conversion state '%s', error "
|
|
"on line %d. ",
|
|
filename,
|
|
rc);
|
|
break;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Rotate to next file if it exists
|
|
*
|
|
* @param router Avro router instance
|
|
* @param pos Current position, used for logging
|
|
* @param stop_seen If a stop event was seen when processing current file
|
|
* @return AVRO_OK if the next file exists, AVRO_LAST_FILE if this is the last
|
|
* available file.
|
|
*/
|
|
static avro_binlog_end_t rotate_to_next_file_if_exists(Avro* router, uint64_t pos)
|
|
{
|
|
avro_binlog_end_t rval = AVRO_LAST_FILE;
|
|
|
|
if (binlog_next_file_exists(router->binlogdir.c_str(), router->binlog_name.c_str()))
|
|
{
|
|
char next_binlog[BINLOG_FNAMELEN + 1];
|
|
if (snprintf(next_binlog,
|
|
sizeof(next_binlog),
|
|
BINLOG_NAMEFMT,
|
|
router->filestem.c_str(),
|
|
blr_file_get_next_binlogname(router->binlog_name.c_str())) >= (int)sizeof(next_binlog))
|
|
{
|
|
MXS_ERROR("Next binlog name did not fit into the allocated buffer "
|
|
"but was truncated, aborting: %s",
|
|
next_binlog);
|
|
rval = AVRO_BINLOG_ERROR;
|
|
}
|
|
else
|
|
{
|
|
MXS_INFO("End of binlog file [%s] at %lu. Rotating to next binlog file [%s].",
|
|
router->binlog_name.c_str(),
|
|
pos,
|
|
next_binlog);
|
|
rval = AVRO_OK;
|
|
router->binlog_name = next_binlog;
|
|
router->current_pos = 4;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Rotate to a specific file
|
|
*
|
|
* This rotates the current binlog file being processed to a specific file.
|
|
* Currently this is only used to rotate to files that rotate events point to.
|
|
* @param router Avro router instance
|
|
* @param pos Current position, only used for logging
|
|
* @param next_binlog The next file to rotate to
|
|
*/
|
|
static void rotate_to_file(Avro* router, uint64_t pos, const char* next_binlog)
|
|
{
|
|
MXS_NOTICE("End of binlog file [%s] at %lu. Rotating to file [%s].",
|
|
router->binlog_name.c_str(),
|
|
pos,
|
|
next_binlog);
|
|
router->binlog_name = next_binlog;
|
|
router->current_pos = 4;
|
|
}
|
|
|
|
/**
|
|
* @brief Read the replication event payload
|
|
*
|
|
* @param router Avro router instance
|
|
* @param hdr Replication header
|
|
* @param pos Starting position of the event header
|
|
* @return The event data or NULL if an error occurred
|
|
*/
|
|
static GWBUF* read_event_data(Avro* router, REP_HEADER* hdr, uint64_t pos)
|
|
{
|
|
GWBUF* result;
|
|
/* Allocate a GWBUF for the event */
|
|
if ((result = gwbuf_alloc(hdr->event_size - BINLOG_EVENT_HDR_LEN + 1)))
|
|
{
|
|
uint8_t* data = GWBUF_DATA(result);
|
|
int n = pread(router->binlog_fd,
|
|
data,
|
|
hdr->event_size - BINLOG_EVENT_HDR_LEN,
|
|
pos + BINLOG_EVENT_HDR_LEN);
|
|
/** NULL-terminate for QUERY_EVENT processing */
|
|
data[hdr->event_size - BINLOG_EVENT_HDR_LEN] = '\0';
|
|
|
|
if (n != static_cast<int>(hdr->event_size - BINLOG_EVENT_HDR_LEN))
|
|
{
|
|
if (n == -1)
|
|
{
|
|
MXS_ERROR("Error reading the event at %lu in %s. "
|
|
"%s, expected %d bytes.",
|
|
pos,
|
|
router->binlog_name.c_str(),
|
|
mxs_strerror(errno),
|
|
hdr->event_size - BINLOG_EVENT_HDR_LEN);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Short read when reading the event at %lu in %s. "
|
|
"Expected %d bytes got %d bytes.",
|
|
pos,
|
|
router->binlog_name.c_str(),
|
|
hdr->event_size - BINLOG_EVENT_HDR_LEN,
|
|
n);
|
|
}
|
|
gwbuf_free(result);
|
|
result = NULL;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to allocate memory for binlog entry, "
|
|
"size %d at %lu.",
|
|
hdr->event_size,
|
|
pos);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
bool notify_cb(DCB* dcb, void* data)
|
|
{
|
|
SERVICE* service = static_cast<SERVICE*>(data);
|
|
|
|
if (dcb->service == service && dcb->dcb_role == DCB_ROLE_CLIENT_HANDLER)
|
|
{
|
|
poll_fake_write_event(dcb);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void notify_all_clients(SERVICE* service)
|
|
{
|
|
dcb_foreach(notify_cb, service);
|
|
}
|
|
|
|
void do_checkpoint(Avro* router)
|
|
{
|
|
router->handler.flush();
|
|
avro_save_conversion_state(router);
|
|
notify_all_clients(router->service);
|
|
router->row_count = router->trx_count = 0;
|
|
}
|
|
|
|
bool read_header(Avro* router, unsigned long long pos, REP_HEADER* hdr, avro_binlog_end_t* rc)
|
|
{
|
|
uint8_t hdbuf[BINLOG_EVENT_HDR_LEN];
|
|
int n = pread(router->binlog_fd, hdbuf, BINLOG_EVENT_HDR_LEN, pos);
|
|
|
|
/* Read the header information from the file */
|
|
if (n != BINLOG_EVENT_HDR_LEN)
|
|
{
|
|
switch (n)
|
|
{
|
|
case 0:
|
|
break;
|
|
|
|
case -1:
|
|
MXS_ERROR("Failed to read binlog file %s at position %llu (%s).",
|
|
router->binlog_name.c_str(),
|
|
pos,
|
|
mxs_strerror(errno));
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Short read when reading the header. "
|
|
"Expected 19 bytes but got %d bytes. "
|
|
"Binlog file is %s, position %llu",
|
|
n,
|
|
router->binlog_name.c_str(),
|
|
pos);
|
|
break;
|
|
}
|
|
|
|
router->current_pos = pos;
|
|
*rc = n == 0 ? AVRO_OK : AVRO_BINLOG_ERROR;
|
|
return false;
|
|
}
|
|
|
|
bool rval = true;
|
|
|
|
*hdr = construct_header(hdbuf);
|
|
|
|
if (hdr->event_type > MAX_EVENT_TYPE_MARIADB10)
|
|
{
|
|
MXS_ERROR("Invalid MariaDB 10 event type 0x%x. Binlog file is %s, position %llu",
|
|
hdr->event_type,
|
|
router->binlog_name.c_str(),
|
|
pos);
|
|
router->current_pos = pos;
|
|
*rc = AVRO_BINLOG_ERROR;
|
|
rval = false;
|
|
}
|
|
else if (hdr->event_size <= 0)
|
|
{
|
|
MXS_ERROR("Event size error: size %d at %llu.", hdr->event_size, pos);
|
|
router->current_pos = pos;
|
|
*rc = AVRO_BINLOG_ERROR;
|
|
rval = false;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static bool pos_is_ok(Avro* router, const REP_HEADER& hdr, uint64_t pos)
|
|
{
|
|
bool rval = false;
|
|
|
|
if (hdr.next_pos > 0 && hdr.next_pos < pos)
|
|
{
|
|
MXS_INFO("Binlog %s: next pos %u < pos %lu, truncating to %lu",
|
|
router->binlog_name.c_str(),
|
|
hdr.next_pos,
|
|
pos,
|
|
pos);
|
|
}
|
|
else if (hdr.next_pos > 0 && hdr.next_pos != (pos + hdr.event_size))
|
|
{
|
|
MXS_INFO("Binlog %s: next pos %u != (pos %lu + event_size %u), truncating to %lu",
|
|
router->binlog_name.c_str(),
|
|
hdr.next_pos,
|
|
pos,
|
|
hdr.event_size,
|
|
pos);
|
|
}
|
|
else if (hdr.next_pos > 0)
|
|
{
|
|
rval = true;
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Current event type %d @ %lu has nex pos = %u : exiting",
|
|
hdr.event_type,
|
|
pos,
|
|
hdr.next_pos);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
bool read_fde(Avro* router)
|
|
{
|
|
bool rval = false;
|
|
avro_binlog_end_t rc;
|
|
REP_HEADER hdr;
|
|
|
|
if (read_header(router, 4, &hdr, &rc))
|
|
{
|
|
if (GWBUF* result = read_event_data(router, &hdr, 4))
|
|
{
|
|
router->handler.handle_event(hdr, GWBUF_DATA(result));
|
|
rval = true;
|
|
}
|
|
}
|
|
else if (rc == AVRO_OK)
|
|
{
|
|
// Empty file
|
|
rval = true;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Read all replication events from a binlog file.
|
|
*
|
|
* Routine detects errors and pending transactions
|
|
*
|
|
* @param router The router instance
|
|
* @param fix Whether to fix or not errors
|
|
* @param debug Whether to enable or not the debug for events
|
|
* @return How the binlog was closed
|
|
* @see enum avro_binlog_end
|
|
*/
|
|
avro_binlog_end_t avro_read_all_events(Avro* router)
|
|
{
|
|
mxb_assert(router->binlog_fd != -1);
|
|
|
|
if (!read_fde(router))
|
|
{
|
|
MXS_ERROR("Failed to read the FDE event from the binary log: %d, %s",
|
|
errno,
|
|
mxs_strerror(errno));
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
uint64_t pos = router->current_pos;
|
|
std::string next_binlog;
|
|
bool rotate_seen = false;
|
|
|
|
while (!maxscale_is_shutting_down())
|
|
{
|
|
avro_binlog_end_t rc;
|
|
REP_HEADER hdr;
|
|
|
|
if (!read_header(router, pos, &hdr, &rc))
|
|
{
|
|
if (rc == AVRO_OK)
|
|
{
|
|
do_checkpoint(router);
|
|
|
|
if (rotate_seen)
|
|
{
|
|
rotate_to_file(router, pos, next_binlog.c_str());
|
|
}
|
|
else
|
|
{
|
|
rc = rotate_to_next_file_if_exists(router, pos);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
GWBUF* result = read_event_data(router, &hdr, pos);
|
|
|
|
if (result == NULL)
|
|
{
|
|
router->current_pos = pos;
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
/* get event content */
|
|
uint8_t* ptr = GWBUF_DATA(result);
|
|
|
|
// These events are only related to binary log files
|
|
if (hdr.event_type == ROTATE_EVENT)
|
|
{
|
|
int len = hdr.event_size - BINLOG_EVENT_HDR_LEN - 8 - (router->handler.have_checksums() ? 4 : 0);
|
|
next_binlog.assign((char*)ptr + 8, len);
|
|
rotate_seen = true;
|
|
}
|
|
else if (hdr.event_type == MARIADB_ANNOTATE_ROWS_EVENT)
|
|
{
|
|
// This appears to need special handling
|
|
int annotate_len = hdr.event_size - BINLOG_EVENT_HDR_LEN
|
|
- (router->handler.have_checksums() ? 4 : 0);
|
|
MXS_INFO("Annotate_rows_event: %.*s", annotate_len, ptr);
|
|
pos += hdr.event_size;
|
|
router->current_pos = pos;
|
|
gwbuf_free(result);
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
if ((hdr.event_type >= WRITE_ROWS_EVENTv0 && hdr.event_type <= DELETE_ROWS_EVENTv1)
|
|
|| (hdr.event_type >= WRITE_ROWS_EVENTv2 && hdr.event_type <= DELETE_ROWS_EVENTv2))
|
|
{
|
|
router->row_count++;
|
|
}
|
|
else if (hdr.event_type == XID_EVENT)
|
|
{
|
|
router->trx_count++;
|
|
}
|
|
|
|
router->handler.handle_event(hdr, ptr);
|
|
}
|
|
|
|
gwbuf_free(result);
|
|
|
|
if (router->row_count >= router->row_target
|
|
|| router->trx_count >= router->trx_target)
|
|
{
|
|
do_checkpoint(router);
|
|
}
|
|
|
|
if (pos_is_ok(router, hdr, pos))
|
|
{
|
|
pos = hdr.next_pos;
|
|
router->current_pos = pos;
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
/**
|
|
* Read the field names from the stored Avro schemas
|
|
*
|
|
* @param router Router instance
|
|
*/
|
|
void avro_load_metadata_from_schemas(Avro* router)
|
|
{
|
|
char path[PATH_MAX + 1];
|
|
snprintf(path, sizeof(path), "%s/*.avsc", router->avrodir.c_str());
|
|
glob_t files;
|
|
|
|
if (glob(path, 0, NULL, &files) != GLOB_NOMATCH)
|
|
{
|
|
char db[MYSQL_DATABASE_MAXLEN + 1], table[MYSQL_TABLE_MAXLEN + 1];
|
|
char table_ident[MYSQL_TABLE_MAXLEN + MYSQL_DATABASE_MAXLEN + 2];
|
|
int version = 0;
|
|
|
|
/** Glob sorts the files in ascending order which means that processing
|
|
* them in reverse should give us the newest schema first. */
|
|
for (int i = files.gl_pathc - 1; i > -1; i--)
|
|
{
|
|
char* dbstart = strrchr(files.gl_pathv[i], '/');
|
|
|
|
if (!dbstart)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
dbstart++;
|
|
|
|
char* tablestart = strchr(dbstart, '.');
|
|
|
|
if (!tablestart)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
snprintf(db, sizeof(db), "%.*s", (int)(tablestart - dbstart), dbstart);
|
|
tablestart++;
|
|
|
|
char* versionstart = strchr(tablestart, '.');
|
|
|
|
if (!versionstart)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
snprintf(table, sizeof(table), "%.*s", (int)(versionstart - tablestart), tablestart);
|
|
versionstart++;
|
|
|
|
char* suffix = strchr(versionstart, '.');
|
|
char* versionend = NULL;
|
|
version = strtol(versionstart, &versionend, 10);
|
|
|
|
if (versionend == suffix)
|
|
{
|
|
snprintf(table_ident, sizeof(table_ident), "%s.%s", db, table);
|
|
STableCreateEvent created(table_create_from_schema(files.gl_pathv[i],
|
|
db,
|
|
table,
|
|
version));
|
|
router->handler.add_create(created);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Malformed schema file name: %s", files.gl_pathv[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
globfree(&files);
|
|
}
|