1073 lines
33 KiB
C
1073 lines
33 KiB
C
/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file avro_file.c - File operations for the Avro router
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*
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* This file contains functions that handle the low level file operations for
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* the Avro router. The handling of Avro data files is done via the Avro C API
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* but the handling of MySQL format binary logs is done manually.
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*
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* Parts of this file have been copied from blr_file.c and modified for other
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* uses.
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 25/02/2016 Markus Mäkelä Initial implementation
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*
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* @endverbatim
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*/
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#include <binlog_common.h>
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#include <blr_constants.h>
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#include <sys/stat.h>
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#include "avrorouter.h"
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#include <maxscale/log_manager.h>
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#include <maxscale/pcre2.h>
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#include <ini.h>
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#include <stdlib.h>
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#include <glob.h>
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#include <maxscale/alloc.h>
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static const char *statefile_section = "avro-conversion";
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static const char *ddl_list_name = "table-ddl.list";
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void handle_query_event(AVRO_INSTANCE *router, REP_HEADER *hdr,
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int *pending_transaction, uint8_t *ptr);
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bool is_create_table_statement(AVRO_INSTANCE *router, char* ptr, size_t len);
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void avro_flush_all_tables(AVRO_INSTANCE *router);
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void avro_notify_client(AVRO_CLIENT *client);
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void avro_update_index(AVRO_INSTANCE* router);
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void update_used_tables(AVRO_INSTANCE* router);
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TABLE_CREATE* table_create_from_schema(const char* file, const char* db,
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const char* table, int version);
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/**
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* Open a binlog file for reading
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*
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* @param router The router instance
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* @param file The binlog file name
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*/
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bool avro_open_binlog(const char *binlogdir, const char *file, int *dest)
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{
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char path[PATH_MAX + 1] = "";
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int fd;
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snprintf(path, sizeof(path), "%s/%s", binlogdir, file);
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if ((fd = open(path, O_RDONLY)) == -1)
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{
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MXS_ERROR("Failed to open binlog file %s.", path);
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return false;
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}
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if (lseek(fd, BINLOG_MAGIC_SIZE, SEEK_SET) < 4)
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{
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/* If for any reason the file's length is between 1 and 3 bytes
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* then report an error. */
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MXS_ERROR("Binlog file %s has an invalid length.", path);
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close(fd);
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return false;
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}
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*dest = fd;
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return true;
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}
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/**
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* Close a binlog file
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* @param fd Binlog file descriptor
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*/
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void avro_close_binlog(int fd)
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{
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close(fd);
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}
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/**
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* @brief Allocate an Avro table
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*
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* Create an Aro table and prepare it for writing.
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* @param filepath Path to the created file
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* @param json_schema The schema of the table in JSON format
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*/
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AVRO_TABLE* avro_table_alloc(const char* filepath, const char* json_schema)
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{
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AVRO_TABLE *table = MXS_CALLOC(1, sizeof(AVRO_TABLE));
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if (table)
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{
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if (avro_schema_from_json_length(json_schema, strlen(json_schema),
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&table->avro_schema))
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{
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MXS_ERROR("Avro error: %s", avro_strerror());
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MXS_FREE(table);
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return NULL;
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}
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int rc = 0;
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if (access(filepath, F_OK) == 0)
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{
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rc = avro_file_writer_open(filepath, &table->avro_file);
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}
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else
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{
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rc = avro_file_writer_create(filepath, table->avro_schema, &table->avro_file);
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}
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if (rc)
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{
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MXS_ERROR("Avro error: %s", avro_strerror());
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avro_schema_decref(table->avro_schema);
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MXS_FREE(table);
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return NULL;
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}
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if ((table->avro_writer_iface = avro_generic_class_from_schema(table->avro_schema)) == NULL)
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{
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MXS_ERROR("Avro error: %s", avro_strerror());
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avro_schema_decref(table->avro_schema);
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avro_file_writer_close(table->avro_file);
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MXS_FREE(table);
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return NULL;
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}
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table->json_schema = MXS_STRDUP_A(json_schema);
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table->filename = MXS_STRDUP_A(filepath);
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}
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return table;
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}
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/**
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* @brief Write a new ini file with current conversion status
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*
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* The file is stored in the cache directory as 'avro-conversion.ini'.
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* @param router Avro router instance
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* @return True if the file was written successfully to disk
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*
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*/
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bool avro_save_conversion_state(AVRO_INSTANCE *router)
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{
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FILE *config_file;
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char filename[PATH_MAX + 1];
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char err_msg[MXS_STRERROR_BUFLEN];
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snprintf(filename, sizeof(filename), "%s/"AVRO_PROGRESS_FILE".tmp", router->avrodir);
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/* open file for writing */
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config_file = fopen(filename, "wb");
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if (config_file == NULL)
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{
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MXS_ERROR("Failed to open file '%s': %d, %s", filename,
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errno, strerror_r(errno, err_msg, sizeof(err_msg)));
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return false;
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}
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fprintf(config_file, "[%s]\n", statefile_section);
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fprintf(config_file, "position=%lu\n", router->current_pos);
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fprintf(config_file, "gtid=%lu-%lu-%lu:%lu\n", router->gtid.domain,
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router->gtid.server_id, router->gtid.seq, router->gtid.event_num);
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fprintf(config_file, "file=%s\n", router->binlog_name);
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fclose(config_file);
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/* rename tmp file to right filename */
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char newname[PATH_MAX + 1];
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snprintf(newname, sizeof(newname), "%s/"AVRO_PROGRESS_FILE, router->avrodir);
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int rc = rename(filename, newname);
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if (rc == -1)
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{
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MXS_ERROR("Failed to rename file '%s' to '%s': %d, %s", filename, newname,
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errno, strerror_r(errno, err_msg, sizeof(err_msg)));
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return false;
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}
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return true;
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}
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/**
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* @brief Callback for the @c ini_parse of the stored conversion position
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*
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* @param data User provided data
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* @param section Section name
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* @param key Parameter name
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* @param value Parameter value
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* @return 1 if the parsing should continue, 0 if an error was detected
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*/
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static int conv_state_handler(void* data, const char* section, const char* key, const char* value)
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{
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AVRO_INSTANCE *router = (AVRO_INSTANCE*) data;
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if (strcmp(section, statefile_section) == 0)
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{
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if (strcmp(key, "gtid") == 0)
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{
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char tempval[strlen(value) + 1];
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memcpy(tempval, value, sizeof(tempval));
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char *saved, *domain = strtok_r(tempval, ":-\n", &saved);
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char *serv_id = strtok_r(NULL, ":-\n", &saved);
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char *seq = strtok_r(NULL, ":-\n", &saved);
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char *subseq = strtok_r(NULL, ":-\n", &saved);
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if (domain && serv_id && seq && subseq)
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{
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router->gtid.domain = strtol(domain, NULL, 10);
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router->gtid.server_id = strtol(serv_id, NULL, 10);
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router->gtid.seq = strtol(seq, NULL, 10);
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router->gtid.event_num = strtol(subseq, NULL, 10);
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}
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}
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else if (strcmp(key, "position") == 0)
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{
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router->current_pos = strtol(value, NULL, 10);
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}
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else if (strcmp(key, "file") == 0)
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{
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size_t len = strlen(value);
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if (len > BINLOG_FNAMELEN)
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{
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MXS_ERROR("Provided value %s for key 'file' is too long. "
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"The maximum allowed length is %d.", value, BINLOG_FNAMELEN);
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return 0;
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}
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strcpy(router->binlog_name, value);
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}
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else
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{
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return 0;
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}
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}
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return 1;
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}
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/**
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* @brief Load a stored conversion state from file
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*
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* @param router Avro router instance
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* @return True if the stored state was loaded successfully
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*/
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bool avro_load_conversion_state(AVRO_INSTANCE *router)
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{
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char filename[PATH_MAX + 1];
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bool rval = false;
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snprintf(filename, sizeof(filename), "%s/"AVRO_PROGRESS_FILE, router->avrodir);
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/** No stored state, this is the first time the router is started */
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if (access(filename, F_OK) == -1)
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{
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return true;
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}
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MXS_NOTICE("[%s] Loading stored conversion state: %s", router->service->name, filename);
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int rc = ini_parse(filename, conv_state_handler, router);
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switch (rc)
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{
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case 0:
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rval = true;
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MXS_NOTICE("Loaded stored binary log conversion state: File: [%s] Position: [%ld] GTID: [%lu-%lu-%lu:%lu]",
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router->binlog_name, router->current_pos, router->gtid.domain,
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router->gtid.server_id, router->gtid.seq, router->gtid.event_num);
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break;
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case -1:
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MXS_ERROR("Failed to open file '%s'. ", filename);
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break;
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case -2:
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MXS_ERROR("Failed to allocate enough memory when parsing file '%s'. ", filename);
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break;
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default:
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MXS_ERROR("Failed to parse stored conversion state '%s', error "
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"on line %d. ", filename, rc);
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break;
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}
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return rval;
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}
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/**
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* @brief Free an AVRO_TABLE
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*
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* @param table Table to free
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*/
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void avro_table_free(AVRO_TABLE *table)
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{
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if (table)
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{
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avro_file_writer_flush(table->avro_file);
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avro_file_writer_close(table->avro_file);
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avro_value_iface_decref(table->avro_writer_iface);
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avro_schema_decref(table->avro_schema);
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MXS_FREE(table->json_schema);
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MXS_FREE(table->filename);
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}
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}
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/**
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* @brief Rotate to next file if it exists
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*
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* @param router Avro router instance
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* @param pos Current position, used for logging
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* @param stop_seen If a stop event was seen when processing current file
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* @return AVRO_OK if the next file exists, AVRO_LAST_FILE if this is the last
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* available file.
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*/
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static avro_binlog_end_t rotate_to_next_file_if_exists(AVRO_INSTANCE* router, uint64_t pos, bool stop_seen)
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{
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avro_binlog_end_t rval = AVRO_LAST_FILE;
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if (binlog_next_file_exists(router->binlogdir, router->binlog_name))
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{
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char next_binlog[BINLOG_FNAMELEN + 1];
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if (snprintf(next_binlog, sizeof(next_binlog),
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BINLOG_NAMEFMT, router->fileroot,
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blr_file_get_next_binlogname(router->binlog_name)) >= sizeof(next_binlog))
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{
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MXS_ERROR("Next binlog name did not fit into the allocated buffer "
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"but was truncated, aborting: %s", next_binlog);
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rval = AVRO_BINLOG_ERROR;
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}
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else
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{
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if (stop_seen)
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{
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MXS_NOTICE("End of binlog file [%s] at %lu with a "
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"close event. Rotating to next binlog file [%s].",
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router->binlog_name, pos, next_binlog);
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}
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else
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{
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MXS_NOTICE("End of binlog file [%s] at %lu with no "
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"close or rotate event. Rotating to next binlog file [%s].",
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router->binlog_name, pos, next_binlog);
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}
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rval = AVRO_OK;
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strcpy(router->binlog_name, next_binlog);
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router->binlog_position = 4;
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router->current_pos = 4;
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}
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}
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else if (stop_seen)
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{
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MXS_NOTICE("End of binlog file [%s] at %lu with a close event. "
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"Next binlog file does not exist, pausing file conversion.",
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router->binlog_name, pos);
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}
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return rval;
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}
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/**
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* @brief Rotate to a specific file
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*
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* This rotates the current binlog file being processed to a specific file.
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* Currently this is only used to rotate to files that rotate events point to.
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* @param router Avro router instance
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* @param pos Current position, only used for logging
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* @param next_binlog The next file to rotate to
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*/
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static void rotate_to_file(AVRO_INSTANCE* router, uint64_t pos, const char *next_binlog)
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{
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/** Binlog file is processed, prepare for next one */
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MXS_NOTICE("End of binlog file [%s] at %lu. Rotating to file [%s].",
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router->binlog_name, pos, next_binlog);
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strcpy(router->binlog_name, next_binlog); // next_binlog is as big as router->binlog_name.
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router->binlog_position = 4;
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router->current_pos = 4;
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}
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/**
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* @brief Read the replication event payload
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*
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* @param router Avro router instance
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* @param hdr Replication header
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* @param pos Starting position of the event header
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* @return The event data or NULL if an error occurred
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*/
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static GWBUF* read_event_data(AVRO_INSTANCE *router, REP_HEADER* hdr, uint64_t pos)
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{
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GWBUF* result;
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/* Allocate a GWBUF for the event */
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if ((result = gwbuf_alloc(hdr->event_size - BINLOG_EVENT_HDR_LEN + 1)))
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{
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uint8_t *data = GWBUF_DATA(result);
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int n = pread(router->binlog_fd, data, hdr->event_size - BINLOG_EVENT_HDR_LEN,
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pos + BINLOG_EVENT_HDR_LEN);
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/** NULL-terminate for QUERY_EVENT processing */
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data[hdr->event_size - BINLOG_EVENT_HDR_LEN] = '\0';
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if (n != hdr->event_size - BINLOG_EVENT_HDR_LEN)
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{
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if (n == -1)
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{
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char err_msg[MXS_STRERROR_BUFLEN];
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MXS_ERROR("Error reading the event at %lu in %s. "
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"%s, expected %d bytes.",
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pos, router->binlog_name,
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strerror_r(errno, err_msg, sizeof(err_msg)),
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hdr->event_size - BINLOG_EVENT_HDR_LEN);
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}
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else
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{
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MXS_ERROR("Short read when reading the event at %lu in %s. "
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"Expected %d bytes got %d bytes.",
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pos, router->binlog_name,
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hdr->event_size - BINLOG_EVENT_HDR_LEN, n);
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}
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gwbuf_free(result);
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result = NULL;
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}
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}
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else
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{
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MXS_ERROR("Failed to allocate memory for binlog entry, "
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"size %d at %lu.",
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hdr->event_size, pos);
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}
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return result;
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}
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void notify_all_clients(AVRO_INSTANCE *router)
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{
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AVRO_CLIENT *client = router->clients;
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int notified = 0;
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while (client)
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{
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spinlock_acquire(&client->catch_lock);
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if (client->cstate & AVRO_WAIT_DATA)
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{
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notified++;
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avro_notify_client(client);
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}
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spinlock_release(&client->catch_lock);
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client = client->next;
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}
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if (notified > 0)
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{
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MXS_INFO("Notified %d clients about new data.", notified);
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}
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}
|
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|
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/**
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* @brief Read all replication events from a binlog file.
|
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*
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* Routine detects errors and pending transactions
|
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*
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* @param router The router instance
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* @param fix Whether to fix or not errors
|
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* @param debug Whether to enable or not the debug for events
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* @return How the binlog was closed
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* @see enum avro_binlog_end
|
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*/
|
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avro_binlog_end_t avro_read_all_events(AVRO_INSTANCE *router)
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{
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uint8_t hdbuf[BINLOG_EVENT_HDR_LEN];
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unsigned long long pos = router->current_pos;
|
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unsigned long long last_known_commit = 4;
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char next_binlog[BINLOG_FNAMELEN + 1];
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REP_HEADER hdr;
|
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int pending_transaction = 0;
|
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uint8_t *ptr;
|
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uint64_t total_commits = 0, total_rows = 0;
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bool found_chksum = false;
|
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bool rotate_seen = false;
|
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bool stop_seen = false;
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|
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if (router->binlog_fd == -1)
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{
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MXS_ERROR("Current binlog file %s is not open", router->binlog_name);
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return AVRO_BINLOG_ERROR;
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}
|
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|
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while (1)
|
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{
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int n;
|
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/* Read the header information from the file */
|
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if ((n = pread(router->binlog_fd, hdbuf, BINLOG_EVENT_HDR_LEN, pos)) != BINLOG_EVENT_HDR_LEN)
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{
|
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switch (n)
|
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{
|
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case 0:
|
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break;
|
|
case -1:
|
|
{
|
|
char err_msg[BLRM_STRERROR_R_MSG_SIZE + 1] = "";
|
|
strerror_r(errno, err_msg, BLRM_STRERROR_R_MSG_SIZE);
|
|
MXS_ERROR("Failed to read binlog file %s at position %llu"
|
|
" (%s).", router->binlog_name,
|
|
pos, err_msg);
|
|
|
|
if (errno == EBADF)
|
|
MXS_ERROR("Bad file descriptor in read binlog for file %s"
|
|
", descriptor %d.",
|
|
router->binlog_name, router->binlog_fd);
|
|
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, pos);
|
|
break;
|
|
}
|
|
|
|
router->current_pos = pos;
|
|
|
|
if (pending_transaction > 0)
|
|
{
|
|
MXS_ERROR("Binlog '%s' ends at position %lu and has an incomplete transaction at %lu. "
|
|
"Stopping file conversion.", router->binlog_name,
|
|
router->current_pos, router->binlog_position);
|
|
return AVRO_OPEN_TRANSACTION;
|
|
}
|
|
else
|
|
{
|
|
/* any error */
|
|
if (n != 0)
|
|
{
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
else
|
|
{
|
|
MXS_INFO("Processed %lu transactions and %lu row events.",
|
|
total_commits, total_rows);
|
|
if (rotate_seen)
|
|
{
|
|
rotate_to_file(router, pos, next_binlog);
|
|
return AVRO_OK;
|
|
}
|
|
else
|
|
{
|
|
return rotate_to_next_file_if_exists(router, pos, stop_seen);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* fill replication header struct */
|
|
hdr.timestamp = EXTRACT32(hdbuf);
|
|
hdr.event_type = hdbuf[4];
|
|
hdr.serverid = EXTRACT32(&hdbuf[5]);
|
|
hdr.event_size = extract_field(&hdbuf[9], 32);
|
|
hdr.next_pos = EXTRACT32(&hdbuf[13]);
|
|
hdr.flags = EXTRACT16(&hdbuf[17]);
|
|
|
|
/* Check event type against MAX_EVENT_TYPE */
|
|
|
|
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, pos);
|
|
router->binlog_position = last_known_commit;
|
|
router->current_pos = pos;
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
if (hdr.event_size <= 0)
|
|
{
|
|
MXS_ERROR("Event size error: "
|
|
"size %d at %llu.",
|
|
hdr.event_size, pos);
|
|
|
|
router->binlog_position = last_known_commit;
|
|
router->current_pos = pos;
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
GWBUF *result = read_event_data(router, &hdr, pos);
|
|
|
|
if (result == NULL)
|
|
{
|
|
router->binlog_position = last_known_commit;
|
|
router->current_pos = pos;
|
|
MXS_WARNING("an error has been found. "
|
|
"Setting safe pos to %lu, current pos %lu",
|
|
router->binlog_position, router->current_pos);
|
|
return AVRO_BINLOG_ERROR;
|
|
}
|
|
|
|
/* check for pending transaction */
|
|
if (pending_transaction == 0)
|
|
{
|
|
last_known_commit = pos;
|
|
}
|
|
|
|
/* get event content */
|
|
ptr = GWBUF_DATA(result);
|
|
|
|
MXS_DEBUG("%s(%x) - %llu", binlog_event_name(hdr.event_type), hdr.event_type, pos);
|
|
|
|
/* check for FORMAT DESCRIPTION EVENT */
|
|
if (hdr.event_type == FORMAT_DESCRIPTION_EVENT)
|
|
{
|
|
int event_header_length;
|
|
int event_header_ntypes;
|
|
int n_events;
|
|
|
|
/** Extract the event header lengths */
|
|
event_header_length = ptr[2 + 50 + 4];
|
|
event_header_ntypes = hdr.event_size - event_header_length - (2 + 50 + 4 + 1);
|
|
memcpy(router->event_type_hdr_lens, ptr + 2 + 50 + 5, event_header_ntypes);
|
|
router->event_types = event_header_ntypes;
|
|
|
|
switch (event_header_ntypes)
|
|
{
|
|
case 168: /* mariadb 10 LOG_EVENT_TYPES*/
|
|
event_header_ntypes -= 163;
|
|
break;
|
|
|
|
case 165: /* mariadb 5 LOG_EVENT_TYPES*/
|
|
event_header_ntypes -= 160;
|
|
break;
|
|
|
|
default: /* mysql 5.6 LOG_EVENT_TYPES = 35 */
|
|
event_header_ntypes -= 35;
|
|
break;
|
|
}
|
|
|
|
n_events = hdr.event_size - event_header_length - (2 + 50 + 4 + 1);
|
|
|
|
if (event_header_ntypes < n_events)
|
|
{
|
|
uint8_t *checksum = ptr + hdr.event_size - event_header_length - event_header_ntypes;
|
|
if (checksum[0] == 1)
|
|
{
|
|
found_chksum = true;
|
|
}
|
|
}
|
|
}
|
|
/* Decode CLOSE/STOP Event */
|
|
else if (hdr.event_type == STOP_EVENT)
|
|
{
|
|
char next_file[BLRM_BINLOG_NAME_STR_LEN + 1];
|
|
stop_seen = true;
|
|
snprintf(next_file, sizeof(next_file), BINLOG_NAMEFMT, router->fileroot,
|
|
blr_file_get_next_binlogname(router->binlog_name));
|
|
}
|
|
else if (hdr.event_type == TABLE_MAP_EVENT)
|
|
{
|
|
handle_table_map_event(router, &hdr, ptr);
|
|
}
|
|
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++;
|
|
handle_row_event(router, &hdr, ptr);
|
|
}
|
|
/* Decode ROTATE EVENT */
|
|
else if (hdr.event_type == ROTATE_EVENT)
|
|
{
|
|
int len = hdr.event_size - BINLOG_EVENT_HDR_LEN - 8;
|
|
|
|
if (found_chksum)
|
|
{
|
|
len -= 4;
|
|
}
|
|
|
|
if (len > BINLOG_FNAMELEN)
|
|
{
|
|
MXS_WARNING("Truncated binlog name from %d to %d characters.",
|
|
len, BINLOG_FNAMELEN);
|
|
len = BINLOG_FNAMELEN;
|
|
}
|
|
|
|
memcpy(next_binlog, ptr + 8, len);
|
|
next_binlog[len] = 0;
|
|
rotate_seen = true;
|
|
|
|
}
|
|
else if (hdr.event_type == MARIADB10_GTID_EVENT)
|
|
{
|
|
uint64_t n_sequence; /* 8 bytes */
|
|
uint32_t domainid; /* 4 bytes */
|
|
unsigned int flags; /* 1 byte */
|
|
n_sequence = extract_field(ptr, 64);
|
|
domainid = extract_field(ptr + 8, 32);
|
|
flags = *(ptr + 8 + 4);
|
|
router->gtid.domain = domainid;
|
|
router->gtid.server_id = hdr.serverid;
|
|
router->gtid.seq = n_sequence;
|
|
router->gtid.event_num = 0;
|
|
router->gtid.timestamp = hdr.timestamp;
|
|
|
|
/* GTID event flags check, for 10.0 and 10.1 */
|
|
if ((flags & (MARIADB_FL_DDL | MARIADB_FL_STANDALONE)) == 0)
|
|
{
|
|
pending_transaction = 1;
|
|
}
|
|
}
|
|
/**
|
|
* Check QUERY_EVENT
|
|
*
|
|
* Check for BEGIN ( ONLY for mysql 5.6, mariadb 5.5 )
|
|
* Check for COMMIT (not transactional engines)
|
|
*/
|
|
else if (hdr.event_type == QUERY_EVENT)
|
|
{
|
|
int trx_before = pending_transaction;
|
|
handle_query_event(router, &hdr, &pending_transaction, ptr);
|
|
|
|
if (trx_before != pending_transaction)
|
|
{
|
|
/** A non-transactional engine finished a transaction */
|
|
router->trx_count++;
|
|
}
|
|
}
|
|
else if (hdr.event_type == XID_EVENT)
|
|
{
|
|
router->trx_count++;
|
|
pending_transaction = 0;
|
|
|
|
if (router->row_count >= router->row_target ||
|
|
router->trx_count >= router->trx_target)
|
|
{
|
|
update_used_tables(router);
|
|
avro_flush_all_tables(router);
|
|
avro_save_conversion_state(router);
|
|
notify_all_clients(router);
|
|
total_rows += router->row_count;
|
|
total_commits += router->trx_count;
|
|
router->row_count = router->trx_count = 0;
|
|
}
|
|
}
|
|
|
|
gwbuf_free(result);
|
|
|
|
/* pos and next_pos sanity checks */
|
|
if (hdr.next_pos > 0 && hdr.next_pos < pos)
|
|
{
|
|
MXS_INFO("Binlog %s: next pos %u < pos %llu, truncating to %llu",
|
|
router->binlog_name, hdr.next_pos, pos, pos);
|
|
break;
|
|
}
|
|
|
|
if (hdr.next_pos > 0 && hdr.next_pos != (pos + hdr.event_size))
|
|
{
|
|
MXS_INFO("Binlog %s: next pos %u != (pos %llu + event_size %u), truncating to %llu",
|
|
router->binlog_name, hdr.next_pos, pos, hdr.event_size, pos);
|
|
break;
|
|
}
|
|
|
|
/* set pos to new value */
|
|
if (hdr.next_pos > 0)
|
|
{
|
|
pos = hdr.next_pos;
|
|
router->current_pos = pos;
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Current event type %d @ %llu has nex pos = %u : exiting",
|
|
hdr.event_type, pos, hdr.next_pos);
|
|
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_INSTANCE *router)
|
|
{
|
|
char path[PATH_MAX + 1];
|
|
snprintf(path, sizeof(path), "%s/*.avsc", router->avrodir);
|
|
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], '/');
|
|
ss_dassert(dbstart);
|
|
dbstart++;
|
|
|
|
char *tablestart = strchr(dbstart, '.');
|
|
ss_dassert(tablestart);
|
|
|
|
snprintf(db, sizeof(db), "%.*s", (int)(tablestart - dbstart), dbstart);
|
|
tablestart++;
|
|
|
|
char *versionstart = strchr(tablestart, '.');
|
|
ss_dassert(versionstart);
|
|
|
|
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);
|
|
TABLE_CREATE *old = hashtable_fetch(router->created_tables, table_ident);
|
|
|
|
if (old == NULL || version > old->version)
|
|
{
|
|
TABLE_CREATE *created = table_create_from_schema(files.gl_pathv[i],
|
|
db, table, version);
|
|
if (old)
|
|
{
|
|
hashtable_delete(router->created_tables, table_ident);
|
|
}
|
|
hashtable_add(router->created_tables, table_ident, created);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Malformed schema file name: %s", files.gl_pathv[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
globfree(&files);
|
|
}
|
|
|
|
/**
|
|
* @brief Flush all Avro records to disk
|
|
* @param router Avro router instance
|
|
*/
|
|
void avro_flush_all_tables(AVRO_INSTANCE *router)
|
|
{
|
|
HASHITERATOR *iter = hashtable_iterator(router->open_tables);
|
|
|
|
if (iter)
|
|
{
|
|
char *key;
|
|
while ((key = (char*)hashtable_next(iter)))
|
|
{
|
|
AVRO_TABLE *table = hashtable_fetch(router->open_tables, key);
|
|
|
|
if (table)
|
|
{
|
|
avro_file_writer_flush(table->avro_file);
|
|
}
|
|
}
|
|
hashtable_iterator_free(iter);
|
|
}
|
|
|
|
/** Update the GTID index */
|
|
avro_update_index(router);
|
|
}
|
|
|
|
/**
|
|
* @brief Detection of table creation statements
|
|
* @param router Avro router instance
|
|
* @param ptr Pointer to statement
|
|
* @param len Statement length
|
|
* @return True if the statement creates a new table
|
|
*/
|
|
bool is_create_table_statement(AVRO_INSTANCE *router, char* ptr, size_t len)
|
|
{
|
|
int rc = 0;
|
|
pcre2_match_data *mdata = pcre2_match_data_create_from_pattern(router->create_table_re, NULL);
|
|
|
|
if (mdata)
|
|
{
|
|
rc = pcre2_match(router->create_table_re, (PCRE2_SPTR) ptr, len, 0, 0, mdata, NULL);
|
|
pcre2_match_data_free(mdata);
|
|
}
|
|
|
|
return rc > 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* @brief Detection of table alteration statements
|
|
* @param router Avro router instance
|
|
* @param ptr Pointer to statement
|
|
* @param len Statement length
|
|
* @return True if the statement alters a table
|
|
*/
|
|
bool is_alter_table_statement(AVRO_INSTANCE *router, char* ptr, size_t len)
|
|
{
|
|
int rc = 0;
|
|
pcre2_match_data *mdata = pcre2_match_data_create_from_pattern(router->alter_table_re, NULL);
|
|
|
|
if (mdata)
|
|
{
|
|
rc = pcre2_match(router->alter_table_re, (PCRE2_SPTR) ptr, len, 0, 0, mdata, NULL);
|
|
pcre2_match_data_free(mdata);
|
|
}
|
|
|
|
return rc > 0;
|
|
}
|
|
|
|
/** Database name offset */
|
|
#define DBNM_OFF 8
|
|
|
|
/** Varblock offset */
|
|
#define VBLK_OFF 4 + 4 + 1 + 2
|
|
|
|
/** Post-header offset */
|
|
#define PHDR_OFF 4 + 4 + 1 + 2 + 2
|
|
|
|
/**
|
|
* Save the CREATE TABLE statement to disk and replace older versions of the table
|
|
* in the router's hashtable.
|
|
* @param router Avro router instance
|
|
* @param created Created table
|
|
* @return False if an error occurred and true if successful
|
|
*/
|
|
bool save_and_replace_table_create(AVRO_INSTANCE *router, TABLE_CREATE *created)
|
|
{
|
|
char table_ident[MYSQL_TABLE_MAXLEN + MYSQL_DATABASE_MAXLEN + 2];
|
|
snprintf(table_ident, sizeof(table_ident), "%s.%s", created->database, created->table);
|
|
|
|
spinlock_acquire(&router->lock); // Is this necessary?
|
|
TABLE_CREATE *old = hashtable_fetch(router->created_tables, table_ident);
|
|
|
|
if (old)
|
|
{
|
|
HASHITERATOR *iter = hashtable_iterator(router->table_maps);
|
|
|
|
char *key;
|
|
while ((key = hashtable_next(iter)))
|
|
{
|
|
if (strcmp(key, table_ident) == 0)
|
|
{
|
|
hashtable_delete(router->table_maps, key);
|
|
}
|
|
}
|
|
|
|
hashtable_iterator_free(iter);
|
|
|
|
hashtable_delete(router->created_tables, table_ident);
|
|
}
|
|
|
|
hashtable_add(router->created_tables, table_ident, created);
|
|
ss_dassert(created->columns > 0);
|
|
spinlock_release(&router->lock);
|
|
return true;
|
|
}
|
|
|
|
void unify_whitespace(char *sql, int len)
|
|
{
|
|
for (int i = 0; i < len; i++)
|
|
{
|
|
if (isspace(sql[i]) && sql[i] != ' ')
|
|
{
|
|
sql[i] = ' ';
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Handling of query events
|
|
*
|
|
* @param router Avro router instance
|
|
* @param hdr Replication header
|
|
* @param pending_transaction Pointer where status of pending transaction is stored
|
|
* @param ptr Pointer to the start of the event payload
|
|
*/
|
|
void handle_query_event(AVRO_INSTANCE *router, REP_HEADER *hdr, int *pending_transaction, uint8_t *ptr)
|
|
{
|
|
int dblen = ptr[DBNM_OFF];
|
|
int vblklen = ptr[VBLK_OFF];
|
|
int len = hdr->event_size - BINLOG_EVENT_HDR_LEN - (PHDR_OFF + vblklen + 1 + dblen) + 1;
|
|
char *sql = (char *) ptr + PHDR_OFF + vblklen + 1 + dblen;
|
|
char db[dblen + 1];
|
|
memcpy(db, (char*) ptr + PHDR_OFF + vblklen, dblen);
|
|
db[dblen] = 0;
|
|
|
|
unify_whitespace(sql, len);
|
|
size_t sqlsz = len, tmpsz = len;
|
|
char *tmp = MXS_MALLOC(len);
|
|
MXS_ABORT_IF_NULL(tmp);
|
|
remove_mysql_comments((const char**)&sql, &sqlsz, &tmp, &tmpsz);
|
|
sql = tmp;
|
|
len = tmpsz;
|
|
|
|
if (is_create_table_statement(router, sql, len))
|
|
{
|
|
TABLE_CREATE *created = table_create_alloc(sql, db);
|
|
|
|
if (created && !save_and_replace_table_create(router, created))
|
|
{
|
|
MXS_ERROR("Failed to save statement to disk: %.*s", len, sql);
|
|
}
|
|
}
|
|
else if (is_alter_table_statement(router, sql, len))
|
|
{
|
|
char ident[MYSQL_TABLE_MAXLEN + MYSQL_DATABASE_MAXLEN + 2];
|
|
read_alter_identifier(sql, sql + len, ident, sizeof(ident));
|
|
|
|
bool combine = (strnlen(db, 1) && strchr(ident, '.') == NULL);
|
|
|
|
size_t len = strlen(ident) + 1; // + 1 for the NULL
|
|
|
|
if (combine)
|
|
{
|
|
len += (strlen(db) + 1); // + 1 for the "."
|
|
}
|
|
|
|
char full_ident[len];
|
|
full_ident[0] = 0; // Set full_ident to "".
|
|
|
|
if (combine)
|
|
{
|
|
strcat(full_ident, db);
|
|
strcat(full_ident, ".");
|
|
}
|
|
|
|
strcat(full_ident, ident);
|
|
|
|
TABLE_CREATE *created = hashtable_fetch(router->created_tables, full_ident);
|
|
ss_dassert(created);
|
|
|
|
if (created)
|
|
{
|
|
table_create_alter(created, sql, sql + len);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Alter statement to a table with no create statement.");
|
|
}
|
|
}
|
|
/* A transaction starts with this event */
|
|
else if (strncmp(sql, "BEGIN", 5) == 0)
|
|
{
|
|
*pending_transaction = 1;
|
|
}
|
|
/* Commit received for non transactional tables, i.e. MyISAM */
|
|
else if (strncmp(sql, "COMMIT", 6) == 0)
|
|
{
|
|
// TODO: Handle COMMIT
|
|
*pending_transaction = 0;
|
|
}
|
|
|
|
MXS_FREE(tmp);
|
|
}
|