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MaxScale/server/modules/routing/avrorouter/avro.c
Markus Mäkelä 7d8905d91f Merge branch '2.1' into 2.2
2018-01-03 14:05:31 +02:00

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/*
* 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: 2020-01-01
*
* 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.c - Avro router, allows MaxScale to act as an intermediary for
* MySQL replication binlog files and AVRO binary files
*/
#include "avrorouter.h"
#include <avro/errors.h>
#include <ctype.h>
#include <ini.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <glob.h>
#include <ini.h>
#include <sys/stat.h>
#include <avro/errors.h>
#include <maxscale/alloc.h>
#include <maxscale/atomic.h>
#include <maxscale/dcb.h>
#include <maxscale/housekeeper.h>
#include <maxscale/log_manager.h>
#include <maxscale/modulecmd.h>
#include <maxscale/paths.h>
#include <maxscale/protocol/mysql.h>
#include <maxscale/random_jkiss.h>
#include <maxscale/router.h>
#include <maxscale/server.h>
#include <maxscale/service.h>
#include <maxscale/spinlock.h>
#include <maxscale/utils.h>
#include <binlog_common.h>
#ifndef BINLOG_NAMEFMT
#define BINLOG_NAMEFMT "%s.%06d"
#endif
#define AVRO_TASK_DELAY_MAX 15
static const char* avro_task_name = "binlog_to_avro";
static const char* index_task_name = "avro_indexing";
static const char* avro_index_name = "avro.index";
/** For detection of CREATE/ALTER TABLE statements */
static const char* create_table_regex =
"(?i)create[a-z0-9[:space:]_]+table";
static const char* alter_table_regex =
"(?i)alter[[:space:]]+table.*column";
/* The router entry points */
static MXS_ROUTER *createInstance(SERVICE *service, char **options);
static MXS_ROUTER_SESSION *newSession(MXS_ROUTER *instance, MXS_SESSION *session);
static void closeSession(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session);
static void freeSession(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session);
static int routeQuery(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *queue);
static void diagnostics(MXS_ROUTER *instance, DCB *dcb);
static json_t* diagnostics_json(const MXS_ROUTER *instance);
static void clientReply(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *queue,
DCB *backend_dcb);
static void errorReply(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *message,
DCB *backend_dcb, mxs_error_action_t action, bool *succp);
static uint64_t getCapabilities(MXS_ROUTER* instance);
extern int MaxScaleUptime();
extern void avro_get_used_tables(AVRO_INSTANCE *router, DCB *dcb);
void converter_func(void* data);
bool binlog_next_file_exists(const char* binlogdir, const char* binlog);
int blr_file_get_next_binlogname(const char *router);
bool avro_load_conversion_state(AVRO_INSTANCE *router);
void avro_load_metadata_from_schemas(AVRO_INSTANCE *router);
int avro_client_callback(DCB *dcb, DCB_REASON reason, void *userdata);
static bool ensure_dir_ok(const char* path, int mode);
bool avro_save_conversion_state(AVRO_INSTANCE *router);
static void stats_func(void *);
void avro_index_file(AVRO_INSTANCE *router, const char* path);
void avro_update_index(AVRO_INSTANCE* router);
static bool conversion_task_ctl(AVRO_INSTANCE *inst, bool start);
static SPINLOCK instlock;
static AVRO_INSTANCE *instances;
bool avro_handle_convert(const MODULECMD_ARG *args, json_t** output)
{
bool rval = false;
if (strcmp(args->argv[1].value.string, "start") == 0 &&
conversion_task_ctl((AVRO_INSTANCE*)args->argv[0].value.service->router_instance, true))
{
MXS_NOTICE("Started conversion for service '%s'.", args->argv[0].value.service->name);
rval = true;
}
else if (strcmp(args->argv[1].value.string, "stop") == 0 &&
conversion_task_ctl((AVRO_INSTANCE*)args->argv[0].value.service->router_instance, false))
{
MXS_NOTICE("Stopped conversion for service '%s'.", args->argv[0].value.service->name);
rval = true;
}
return rval;
}
static const MXS_ENUM_VALUE codec_values[] =
{
{"null", MXS_AVRO_CODEC_NULL},
{"deflate", MXS_AVRO_CODEC_DEFLATE},
// Not yet implemented
// {"snappy", MXS_AVRO_CODEC_SNAPPY},
{NULL}
};
static bool do_unlink(const char* format, ...)
{
va_list args;
va_start(args, format);
char filename[PATH_MAX + 1];
vsnprintf(filename, sizeof(filename), format, args);
va_end(args);
int rc = unlink(filename);
return rc == 0 || rc == ENOENT;
}
static bool do_unlink_with_pattern(const char* format, ...)
{
bool rval = true;
va_list args;
va_start(args, format);
char filename[PATH_MAX + 1];
vsnprintf(filename, sizeof(filename), format, args);
va_end(args);
glob_t g;
int rc = glob(filename, 0, NULL, &g);
if (rc == 0)
{
for (size_t i = 0; i < g.gl_pathc; i++)
{
if (!do_unlink("%s", g.gl_pathv[i]))
{
rval = false;
}
}
}
else if (rc != GLOB_NOMATCH)
{
modulecmd_set_error("Failed to search '%s': %d, %s",
filename, errno, mxs_strerror(errno));
rval = false;
}
globfree(&g);
return rval;
}
static bool avro_handle_purge(const MODULECMD_ARG *args, json_t** output)
{
AVRO_INSTANCE* inst = (AVRO_INSTANCE*)args->argv[0].value.service->router_instance;
// First stop the conversion service
conversion_task_ctl(inst, false);
// Then delete the files
return do_unlink("%s/%s", inst->avrodir, AVRO_PROGRESS_FILE) && // State file
do_unlink("/%s/%s", inst->avrodir, avro_index_name) && // Index database
do_unlink_with_pattern("/%s/*.avro", inst->avrodir) && // .avro files
do_unlink_with_pattern("/%s/*.avsc", inst->avrodir); // .avsc files
}
/**
* The module entry point routine. It is this routine that
* must populate the structure that is referred to as the
* "module object", this is a structure with the set of
* external entry points for this module.
*
* @return The module object
*/
MXS_MODULE* MXS_CREATE_MODULE()
{
spinlock_init(&instlock);
instances = NULL;
static modulecmd_arg_type_t args_convert[] =
{
{ MODULECMD_ARG_SERVICE | MODULECMD_ARG_NAME_MATCHES_DOMAIN, "The avrorouter service" },
{ MODULECMD_ARG_STRING, "Action, whether to 'start' or 'stop' the conversion process" }
};
modulecmd_register_command(MXS_MODULE_NAME, "convert", MODULECMD_TYPE_ACTIVE,
avro_handle_convert, 2, args_convert,
"Start or stop the binlog to avro conversion process");
static modulecmd_arg_type_t args_purge[] =
{
{
MODULECMD_ARG_SERVICE | MODULECMD_ARG_NAME_MATCHES_DOMAIN,
"The avrorouter service to purge (NOTE: THIS REMOVES ALL CONVERTED FILES)"
}
};
modulecmd_register_command(MXS_MODULE_NAME, "purge", MODULECMD_TYPE_ACTIVE,
avro_handle_purge, 1, args_purge,
"Purge created Avro files and reset conversion state. "
"NOTE: MaxScale must be restarted after this call.");
static MXS_ROUTER_OBJECT MyObject =
{
createInstance,
newSession,
closeSession,
freeSession,
routeQuery,
diagnostics,
diagnostics_json,
clientReply,
errorReply,
getCapabilities,
NULL
};
static MXS_MODULE info =
{
MXS_MODULE_API_ROUTER,
MXS_MODULE_GA,
MXS_ROUTER_VERSION,
"Binlogrouter",
"V1.0.0",
RCAP_TYPE_NO_RSESSION | RCAP_TYPE_NO_AUTH,
&MyObject,
NULL, /* Process init. */
NULL, /* Process finish. */
NULL, /* Thread init. */
NULL, /* Thread finish. */
{
{
"binlogdir",
MXS_MODULE_PARAM_PATH,
NULL,
MXS_MODULE_OPT_PATH_R_OK |
MXS_MODULE_OPT_PATH_CREAT
},
{
"avrodir",
MXS_MODULE_PARAM_PATH,
MXS_DEFAULT_DATADIR,
MXS_MODULE_OPT_PATH_R_OK |
MXS_MODULE_OPT_PATH_W_OK |
MXS_MODULE_OPT_PATH_CREAT
},
{"source", MXS_MODULE_PARAM_SERVICE},
{"filestem", MXS_MODULE_PARAM_STRING, BINLOG_NAME_ROOT},
{"group_rows", MXS_MODULE_PARAM_COUNT, "1000"},
{"group_trx", MXS_MODULE_PARAM_COUNT, "1"},
{"start_index", MXS_MODULE_PARAM_COUNT, "1"},
{"block_size", MXS_MODULE_PARAM_SIZE, "0"},
{"codec", MXS_MODULE_PARAM_ENUM, "null", MXS_MODULE_OPT_ENUM_UNIQUE, codec_values},
{MXS_END_MODULE_PARAMS}
}
};
return &info;
}
/**
* Create the required tables in the sqlite database
*
* @param handle SQLite handle
* @return True on success, false on error
*/
bool create_tables(sqlite3* handle)
{
char* errmsg;
int rc = sqlite3_exec(handle, "CREATE TABLE IF NOT EXISTS "
GTID_TABLE_NAME"(domain int, server_id int, "
"sequence bigint, "
"avrofile varchar(255), "
"position bigint, "
"primary key(domain, server_id, sequence, avrofile));",
NULL, NULL, &errmsg);
if (rc != SQLITE_OK)
{
MXS_ERROR("Failed to create GTID index table '"GTID_TABLE_NAME"': %s",
sqlite3_errmsg(handle));
sqlite3_free(errmsg);
return false;
}
rc = sqlite3_exec(handle, "CREATE TABLE IF NOT EXISTS "
USED_TABLES_TABLE_NAME"(domain int, server_id int, "
"sequence bigint, binlog_timestamp bigint, "
"table_name varchar(255));",
NULL, NULL, &errmsg);
if (rc != SQLITE_OK)
{
MXS_ERROR("Failed to create used tables table '"USED_TABLES_TABLE_NAME"': %s",
sqlite3_errmsg(handle));
sqlite3_free(errmsg);
return false;
}
rc = sqlite3_exec(handle, "CREATE TABLE IF NOT EXISTS "
INDEX_TABLE_NAME"(position bigint, filename varchar(255));",
NULL, NULL, &errmsg);
if (rc != SQLITE_OK)
{
MXS_ERROR("Failed to create indexing progress table '"INDEX_TABLE_NAME"': %s",
sqlite3_errmsg(handle));
sqlite3_free(errmsg);
return false;
}
rc = sqlite3_exec(handle, "ATTACH DATABASE ':memory:' AS "MEMORY_DATABASE_NAME,
NULL, NULL, &errmsg);
if (rc != SQLITE_OK)
{
MXS_ERROR("Failed to attach in-memory database '"MEMORY_DATABASE_NAME"': %s",
sqlite3_errmsg(handle));
sqlite3_free(errmsg);
return false;
}
rc = sqlite3_exec(handle, "CREATE TABLE " MEMORY_TABLE_NAME
"(domain int, server_id int, "
"sequence bigint, binlog_timestamp bigint, "
"table_name varchar(255), primary key (domain, server_id, sequence, table_name));",
NULL, NULL, &errmsg);
if (rc != SQLITE_OK)
{
MXS_ERROR("Failed to create in-memory used tables table '"MEMORY_DATABASE_NAME
"."MEMORY_TABLE_NAME"': %s",
sqlite3_errmsg(handle));
sqlite3_free(errmsg);
return false;
}
return true;
}
static bool conversion_task_ctl(AVRO_INSTANCE *inst, bool start)
{
bool rval = false;
if (!inst->service->svc_do_shutdown)
{
char tasknm[strlen(avro_task_name) + strlen(inst->service->name) + 2];
snprintf(tasknm, sizeof(tasknm), "%s-%s", inst->service->name, avro_task_name);
/** Remove old task and create a new one */
hktask_remove(tasknm);
if (!start || hktask_add(tasknm, converter_func, inst, inst->task_delay))
{
rval = true;
}
else
{
MXS_ERROR("Failed to add binlog to Avro conversion task to housekeeper.");
}
}
return rval;
}
/**
* @brief Read router options from an external binlogrouter service
*
* This reads common options used by both the avrorouter and the binlogrouter
* from a service that uses the binlogrouter. This way the basic configuration
* details can be read from another service without the need to configure the
* avrorouter with identical router options.
*
* @param inst Avro router instance
* @param options The @c router_options of a binlogrouter instance
*/
void read_source_service_options(AVRO_INSTANCE *inst, const char** options,
MXS_CONFIG_PARAMETER* params)
{
for (MXS_CONFIG_PARAMETER* p = params; p; p = p->next)
{
if (strcmp(p->name, "binlogdir") == 0)
{
MXS_FREE(inst->binlogdir);
inst->binlogdir = MXS_STRDUP_A(p->value);
}
else if (strcmp(p->name, "filestem") == 0)
{
MXS_FREE(inst->fileroot);
inst->fileroot = MXS_STRDUP_A(p->value);
}
}
if (options)
{
for (int i = 0; options[i]; i++)
{
char option[strlen(options[i]) + 1];
strcpy(option, options[i]);
char *value = strchr(option, '=');
if (value)
{
*value++ = '\0';
value = trim(value);
if (strcmp(option, "binlogdir") == 0)
{
MXS_FREE(inst->binlogdir);
inst->binlogdir = MXS_STRDUP_A(value);
}
else if (strcmp(option, "filestem") == 0)
{
MXS_FREE(inst->fileroot);
inst->fileroot = MXS_STRDUP_A(value);
}
}
}
}
}
/**
* TABLE_CREATE free function for use with hashtable.
* @param v Pointer to a TABLE_CREATE
*/
static void table_create_hfree(void* v)
{
table_create_free((TABLE_CREATE*)v);
}
/**
* AVRO_TABLE free function for use with hashtable.
* @param v Pointer to a AVRO_TABLE
*/
static void avro_table_hfree(void* v)
{
avro_table_free((AVRO_TABLE*)v);
}
/**
* TABLE_MAP free function for use with hashtable.
* @param v Pointer to a TABLE_MAP
*/
static void table_map_hfree(void* v)
{
table_map_free((TABLE_MAP*)v);
}
/**
* Create an instance of the router for a particular service
* within MaxScale.
*
* The process of creating the instance causes the router to register
* with the master server and begin replication of the binlogs from
* the master server to MaxScale.
*
* @param service The service this router is being create for
* @param options An array of options for this query router
*
* @return The instance data for this new instance
*/
static MXS_ROUTER *
createInstance(SERVICE *service, char **options)
{
AVRO_INSTANCE *inst;
int i;
if ((inst = MXS_CALLOC(1, sizeof(AVRO_INSTANCE))) == NULL)
{
return NULL;
}
memset(&inst->stats, 0, sizeof(AVRO_ROUTER_STATS));
spinlock_init(&inst->lock);
spinlock_init(&inst->fileslock);
inst->service = service;
inst->binlog_fd = -1;
inst->current_pos = 4;
inst->binlog_position = 4;
inst->clients = NULL;
inst->next = NULL;
inst->lastEventTimestamp = 0;
inst->binlog_position = 0;
inst->task_delay = 1;
inst->row_count = 0;
inst->trx_count = 0;
inst->binlogdir = NULL;
MXS_CONFIG_PARAMETER *params = service->svc_config_param;
inst->avrodir = MXS_STRDUP_A(config_get_string(params, "avrodir"));
inst->fileroot = MXS_STRDUP_A(config_get_string(params, "filestem"));
inst->row_target = config_get_integer(params, "group_rows");
inst->trx_target = config_get_integer(params, "group_trx");
inst->codec = config_get_enum(params, "codec", codec_values);
int first_file = config_get_integer(params, "start_index");
inst->block_size = config_get_size(params, "block_size");
MXS_CONFIG_PARAMETER *param = config_get_param(params, "source");
inst->gtid.domain = 0;
inst->gtid.event_num = 0;
inst->gtid.seq = 0;
inst->gtid.server_id = 0;
inst->gtid.timestamp = 0;
memset(&inst->active_maps, 0, sizeof(inst->active_maps));
bool err = false;
if (param)
{
SERVICE *source = service_find(param->value);
ss_dassert(source);
if (source)
{
if (strcmp(source->routerModule, "binlogrouter") == 0)
{
MXS_NOTICE("[%s] Using configuration options from service '%s'.",
service->name, source->name);
read_source_service_options(inst, (const char**)source->routerOptions,
source->svc_config_param);
}
else
{
MXS_ERROR("[%s] Service '%s' uses router module '%s' instead of"
" 'binlogrouter'.", service->name, source->name,
source->routerModule);
err = true;
}
}
}
param = config_get_param(params, "binlogdir");
if (param)
{
MXS_FREE(inst->binlogdir);
inst->binlogdir = MXS_STRDUP_A(param->value);
}
if (options)
{
MXS_WARNING("Router options for Avrorouter are deprecated. Please convert them to parameters.");
for (i = 0; options[i]; i++)
{
char *value;
if ((value = strchr(options[i], '=')))
{
*value++ = '\0';
trim(value);
trim(options[i]);
if (strcmp(options[i], "binlogdir") == 0)
{
MXS_FREE(inst->binlogdir);
inst->binlogdir = MXS_STRDUP_A(value);
}
else if (strcmp(options[i], "avrodir") == 0)
{
MXS_FREE(inst->avrodir);
inst->avrodir = MXS_STRDUP_A(value);
}
else if (strcmp(options[i], "filestem") == 0)
{
MXS_FREE(inst->fileroot);
inst->fileroot = MXS_STRDUP_A(value);
}
else if (strcmp(options[i], "group_rows") == 0)
{
inst->row_target = atoi(value);
}
else if (strcmp(options[i], "group_trx") == 0)
{
inst->trx_target = atoi(value);
}
else if (strcmp(options[i], "start_index") == 0)
{
first_file = MXS_MAX(1, atoi(value));
}
else if (strcmp(options[i], "block_size") == 0)
{
inst->block_size = atoi(value);
}
else
{
MXS_WARNING("Unknown router option: '%s'", options[i]);
err = true;
}
}
else
{
MXS_WARNING("Unknown router option: '%s'", options[i]);
err = true;
}
}
}
if (inst->binlogdir == NULL)
{
MXS_ERROR("No 'binlogdir' option found in source service, in parameters or in router_options.");
err = true;
}
else if (inst->fileroot == NULL)
{
MXS_ERROR("No 'filestem' option found in source service, in parameters or in router_options.");
err = true;
}
else if (ensure_dir_ok(inst->binlogdir, R_OK) && ensure_dir_ok(inst->avrodir, W_OK))
{
snprintf(inst->binlog_name, sizeof(inst->binlog_name), BINLOG_NAMEFMT, inst->fileroot, first_file);
inst->prevbinlog[0] = '\0';
MXS_NOTICE("[%s] Reading MySQL binlog files from %s", service->name, inst->binlogdir);
MXS_NOTICE("[%s] Avro files stored at: %s", service->name, inst->avrodir);
MXS_NOTICE("[%s] First binlog is: %s", service->name, inst->binlog_name);
}
if ((inst->table_maps = hashtable_alloc(1000, hashtable_item_strhash, hashtable_item_strcmp)) &&
(inst->open_tables = hashtable_alloc(1000, hashtable_item_strhash, hashtable_item_strcmp)) &&
(inst->created_tables = hashtable_alloc(1000, hashtable_item_strhash, hashtable_item_strcmp)))
{
hashtable_memory_fns(inst->table_maps, hashtable_item_strdup, NULL,
hashtable_item_free, table_map_hfree);
hashtable_memory_fns(inst->open_tables, hashtable_item_strdup, NULL,
hashtable_item_free, avro_table_hfree);
hashtable_memory_fns(inst->created_tables, hashtable_item_strdup, NULL,
hashtable_item_free, table_create_hfree);
}
else
{
MXS_ERROR("Hashtable allocation failed. This is most likely caused "
"by a lack of available memory.");
err = true;
}
int pcreerr;
size_t erroff;
pcre2_code *create_re = pcre2_compile((PCRE2_SPTR) create_table_regex,
PCRE2_ZERO_TERMINATED, 0, &pcreerr, &erroff, NULL);
ss_dassert(create_re); // This should almost never fail
pcre2_code *alter_re = pcre2_compile((PCRE2_SPTR) alter_table_regex,
PCRE2_ZERO_TERMINATED, 0, &pcreerr, &erroff, NULL);
ss_dassert(alter_re); // This should almost never fail
if (create_re && alter_re)
{
inst->create_table_re = create_re;
inst->alter_table_re = alter_re;
}
else
{
err = true;
}
char dbpath[PATH_MAX + 1];
snprintf(dbpath, sizeof(dbpath), "/%s/%s", inst->avrodir, avro_index_name);
if (access(dbpath, W_OK) == 0)
{
MXS_NOTICE("[%s] Using existing GTID index: %s", service->name, dbpath);
}
if (sqlite3_open_v2(dbpath, &inst->sqlite_handle,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL) != SQLITE_OK)
{
MXS_ERROR("Failed to open SQLite database '%s': %s", dbpath,
sqlite3_errmsg(inst->sqlite_handle));
err = true;
}
else if (!create_tables(inst->sqlite_handle))
{
err = true;
}
if (err)
{
sqlite3_close_v2(inst->sqlite_handle);
hashtable_free(inst->table_maps);
hashtable_free(inst->open_tables);
hashtable_free(inst->created_tables);
MXS_FREE(inst->avrodir);
MXS_FREE(inst->binlogdir);
MXS_FREE(inst->fileroot);
MXS_FREE(inst);
return NULL;
}
/**
* We have completed the creation of the instance data, so now
* insert this router instance into the linked list of routers
* that have been created with this module.
*/
spinlock_acquire(&instlock);
inst->next = instances;
instances = inst;
spinlock_release(&instlock);
/* AVRO converter init */
avro_load_conversion_state(inst);
avro_load_metadata_from_schemas(inst);
/*
* Add tasks for statistic computation
*/
/** Not used currenly
snprintf(task_name, BLRM_TASK_NAME_LEN, "%s stats", service->name);
hktask_add(task_name, stats_func, inst, AVRO_STATS_FREQ);
*/
/* Start the scan, read, convert AVRO task */
conversion_task_ctl(inst, true);
MXS_INFO("current MySQL binlog file is %s, pos is %lu\n",
inst->binlog_name, inst->current_pos);
return (MXS_ROUTER *) inst;
}
/**
* Associate a new session with this instance of the router.
*
* In the case of the avrorouter a new session equates to a new slave
* connecting to MaxScale and requesting binlog records. We need to go
* through the slave registration process for this new slave.
*
* @param instance The router instance data
* @param session The session itself
* @return Session specific data for this session
*/
static MXS_ROUTER_SESSION *
newSession(MXS_ROUTER *instance, MXS_SESSION *session)
{
AVRO_INSTANCE *inst = (AVRO_INSTANCE *) instance;
AVRO_CLIENT *client;
MXS_DEBUG("%lu [newSession] new router session with "
"session %p, and inst %p.", pthread_self(), session, inst);
if ((client = (AVRO_CLIENT *) MXS_CALLOC(1, sizeof(AVRO_CLIENT))) == NULL)
{
return NULL;
}
#if defined(SS_DEBUG)
client->rses_chk_top = CHK_NUM_ROUTER_SES;
client->rses_chk_tail = CHK_NUM_ROUTER_SES;
#endif
memset(&client->stats, 0, sizeof(AVRO_CLIENT_STATS));
atomic_add(&inst->stats.n_clients, 1);
client->uuid = NULL;
spinlock_init(&client->catch_lock);
client->dcb = session->client_dcb;
client->router = inst;
client->format = AVRO_FORMAT_UNDEFINED;
client->cstate = 0;
client->connect_time = time(0);
client->last_sent_pos = 0;
memset(&client->gtid, 0, sizeof(client->gtid));
memset(&client->gtid_start, 0, sizeof(client->gtid_start));
/* Set initial state of the slave */
client->state = AVRO_CLIENT_UNREGISTERED;
char dbpath[PATH_MAX + 1];
snprintf(dbpath, sizeof(dbpath), "/%s/%s", inst->avrodir, avro_index_name);
/** A new handle for each client allows thread-safe use of the sqlite database */
if (sqlite3_open_v2(dbpath, &client->sqlite_handle,
SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL) != SQLITE_OK)
{
MXS_ERROR("Failed to open SQLite database '%s': %s", dbpath,
sqlite3_errmsg(inst->sqlite_handle));
sqlite3_close_v2(client->sqlite_handle);
}
/**
* Add this session to the list of active sessions.
*/
spinlock_acquire(&inst->lock);
client->next = inst->clients;
inst->clients = client;
spinlock_release(&inst->lock);
CHK_CLIENT_RSES(client);
return (void *) client;
}
/**
* The session is no longer required. Shutdown all operation and free memory
* associated with this session. In this case a single session is associated
* to a slave of MaxScale. Therefore this is called when that slave is no
* longer active and should remove of reference to that slave, free memory
* and prevent any further forwarding of binlog records to that slave.
*
* Parameters:
* @param router_instance The instance of the router
* @param router_cli_ses The particular session to free
*
*/
static void freeSession(MXS_ROUTER* router_instance, MXS_ROUTER_SESSION* router_client_ses)
{
AVRO_INSTANCE *router = (AVRO_INSTANCE *) router_instance;
AVRO_CLIENT *client = (AVRO_CLIENT *) router_client_ses;
ss_debug(int prev_val = )atomic_add(&router->stats.n_clients, -1);
ss_dassert(prev_val > 0);
free(client->uuid);
maxavro_file_close(client->file_handle);
sqlite3_close_v2(client->sqlite_handle);
/*
* Remove the slave session form the list of slaves that are using the
* router currently.
*/
spinlock_acquire(&router->lock);
if (router->clients == client)
{
router->clients = client->next;
}
else
{
AVRO_CLIENT *ptr = router->clients;
while (ptr != NULL && ptr->next != client)
{
ptr = ptr->next;
}
if (ptr != NULL)
{
ptr->next = client->next;
}
}
spinlock_release(&router->lock);
MXS_FREE(client);
}
/**
* Close a session with the router, this is the mechanism
* by which a router may cleanup data structure etc.
*
* @param instance The router instance data
* @param router_session The session being closed
*/
static void closeSession(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session)
{
AVRO_INSTANCE *router = (AVRO_INSTANCE *) instance;
AVRO_CLIENT *client = (AVRO_CLIENT *) router_session;
CHK_CLIENT_RSES(client);
spinlock_acquire(&client->catch_lock);
spinlock_acquire(&client->file_lock);
client->state = AVRO_CLIENT_UNREGISTERED;
spinlock_release(&client->file_lock);
spinlock_release(&client->catch_lock);
}
/**
* We have data from the client, this is likely to be packets related to
* the registration of the slave to receive binlog records. Unlike most
* MaxScale routers there is no forwarding to the backend database, merely
* the return of either predefined server responses that have been cached
* or binlog records.
*
* @param instance The router instance
* @param router_session The router session returned from the newSession call
* @param queue The queue of data buffers to route
* @return 1 on success, 0 on error
*/
static int
routeQuery(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *queue)
{
AVRO_INSTANCE *router = (AVRO_INSTANCE *) instance;
AVRO_CLIENT *client = (AVRO_CLIENT *) router_session;
return avro_client_handle_request(router, client, queue);
}
/**
* Display router diagnostics
*
* @param instance Instance of the router
* @param dcb DCB to send diagnostics to
*/
static void
diagnostics(MXS_ROUTER *router, DCB *dcb)
{
AVRO_INSTANCE *router_inst = (AVRO_INSTANCE *) router;
AVRO_CLIENT *session;
int i = 0;
char buf[40];
struct tm tm;
spinlock_acquire(&router_inst->lock);
session = router_inst->clients;
while (session)
{
i++;
session = session->next;
}
spinlock_release(&router_inst->lock);
dcb_printf(dcb, "\tAVRO Converter infofile: %s/%s\n",
router_inst->avrodir, AVRO_PROGRESS_FILE);
dcb_printf(dcb, "\tAVRO files directory: %s\n",
router_inst->avrodir);
localtime_r(&router_inst->stats.lastReply, &tm);
asctime_r(&tm, buf);
dcb_printf(dcb, "\tBinlog directory: %s\n",
router_inst->binlogdir);
dcb_printf(dcb, "\tCurrent binlog file: %s\n",
router_inst->binlog_name);
dcb_printf(dcb, "\tCurrent binlog position: %lu\n",
router_inst->current_pos);
dcb_printf(dcb, "\tCurrent GTID value: %lu-%lu-%lu\n",
router_inst->gtid.domain, router_inst->gtid.server_id,
router_inst->gtid.seq);
dcb_printf(dcb, "\tCurrent GTID timestamp: %u\n",
router_inst->gtid.timestamp);
dcb_printf(dcb, "\tCurrent GTID #events: %lu\n",
router_inst->gtid.event_num);
dcb_printf(dcb, "\tCurrent GTID affected tables: ");
avro_get_used_tables(router_inst, dcb);
dcb_printf(dcb, "\n");
dcb_printf(dcb, "\tNumber of AVRO clients: %u\n",
router_inst->stats.n_clients);
if (router_inst->clients)
{
dcb_printf(dcb, "\tClients:\n");
spinlock_acquire(&router_inst->lock);
session = router_inst->clients;
while (session)
{
char sync_marker_hex[SYNC_MARKER_SIZE * 2 + 1];
dcb_printf(dcb, "\t\tClient UUID: %s\n", session->uuid);
dcb_printf(dcb, "\t\tClient_host_port: [%s]:%d\n",
session->dcb->remote, dcb_get_port(session->dcb));
dcb_printf(dcb, "\t\tUsername: %s\n", session->dcb->user);
dcb_printf(dcb, "\t\tClient DCB: %p\n", session->dcb);
dcb_printf(dcb, "\t\tClient protocol: %s\n",
session->dcb->service->ports->protocol);
dcb_printf(dcb, "\t\tClient Output Format: %s\n",
avro_client_ouput[session->format]);
dcb_printf(dcb, "\t\tState: %s\n",
avro_client_states[session->state]);
dcb_printf(dcb, "\t\tAvro file: %s\n", session->avro_binfile);
gw_bin2hex(sync_marker_hex, session->avro_file.sync, SYNC_MARKER_SIZE);
dcb_printf(dcb, "\t\tAvro file SyncMarker: %s\n", sync_marker_hex);
dcb_printf(dcb, "\t\tAvro file last read block: %lu\n",
session->avro_file.blocks_read);
dcb_printf(dcb, "\t\tAvro file last read record: %lu\n",
session->avro_file.records_read);
if (session->gtid_start.domain > 0 || session->gtid_start.server_id > 0 ||
session->gtid_start.seq > 0)
{
dcb_printf(dcb, "\t\tRequested GTID: %lu-%lu-%lu\n",
session->gtid_start.domain, session->gtid_start.server_id,
session->gtid_start.seq);
}
dcb_printf(dcb, "\t\tCurrent GTID: %lu-%lu-%lu\n",
session->gtid.domain, session->gtid.server_id,
session->gtid.seq);
dcb_printf(dcb, "\t\t--------------------\n\n");
session = session->next;
}
spinlock_release(&router_inst->lock);
}
}
/**
* Display router diagnostics
*
* @param instance Instance of the router
*/
static json_t* diagnostics_json(const MXS_ROUTER *router)
{
AVRO_INSTANCE *router_inst = (AVRO_INSTANCE *)router;
json_t* rval = json_object();
char pathbuf[PATH_MAX + 1];
snprintf(pathbuf, sizeof(pathbuf), "%s/%s", router_inst->avrodir, AVRO_PROGRESS_FILE);
json_object_set_new(rval, "infofile", json_string(pathbuf));
json_object_set_new(rval, "avrodir", json_string(router_inst->avrodir));
json_object_set_new(rval, "binlogdir", json_string(router_inst->binlogdir));
json_object_set_new(rval, "binlog_name", json_string(router_inst->binlog_name));
json_object_set_new(rval, "binlog_pos", json_integer(router_inst->current_pos));
snprintf(pathbuf, sizeof(pathbuf), "%lu-%lu-%lu", router_inst->gtid.domain,
router_inst->gtid.server_id, router_inst->gtid.seq);
json_object_set_new(rval, "gtid", json_string(pathbuf));
json_object_set_new(rval, "gtid_timestamp", json_integer(router_inst->gtid.timestamp));
json_object_set_new(rval, "gtid_event_number", json_integer(router_inst->gtid.event_num));
json_object_set_new(rval, "clients", json_integer(router_inst->stats.n_clients));
if (router_inst->clients)
{
json_t* arr = json_array();
spinlock_acquire(&router_inst->lock);
for (AVRO_CLIENT *session = router_inst->clients; session; session = session->next)
{
json_t* client = json_object();
json_object_set_new(client, "uuid", json_string(session->uuid));
json_object_set_new(client, "host", json_string(session->dcb->remote));
json_object_set_new(client, "port", json_integer(dcb_get_port(session->dcb)));
json_object_set_new(client, "user", json_string(session->dcb->user));
json_object_set_new(client, "format", json_string(avro_client_ouput[session->format]));
json_object_set_new(client, "state", json_string(avro_client_states[session->state]));
json_object_set_new(client, "avrofile", json_string(session->avro_binfile));
json_object_set_new(client, "avrofile_last_block",
json_integer(session->avro_file.blocks_read));
json_object_set_new(client, "avrofile_last_record",
json_integer(session->avro_file.records_read));
if (session->gtid_start.domain > 0 || session->gtid_start.server_id > 0 ||
session->gtid_start.seq > 0)
{
snprintf(pathbuf, sizeof(pathbuf), "%lu-%lu-%lu", session->gtid_start.domain,
session->gtid_start.server_id, session->gtid_start.seq);
json_object_set_new(client, "requested_gtid", json_string(pathbuf));
}
snprintf(pathbuf, sizeof(pathbuf), "%lu-%lu-%lu", session->gtid.domain,
session->gtid.server_id, session->gtid.seq);
json_object_set_new(client, "current_gtid", json_string(pathbuf));
json_array_append_new(arr, client);
}
spinlock_release(&router_inst->lock);
json_object_set_new(rval, "clients", arr);
}
return rval;
}
/**
* Client Reply routine - in this case this is a message from the
* master server, It should be sent to the state machine that manages
* master packets as it may be binlog records or part of the registration
* handshake that takes part during connection establishment.
*
*
* @param instance The router instance
* @param router_session The router session
* @param master_dcb The DCB for the connection to the master
* @param queue The GWBUF with reply data
*/
static void
clientReply(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *queue, DCB *backend_dcb)
{
/** We should never end up here */
ss_dassert(false);
}
/*
static char *
extract_message(GWBUF *errpkt)
{
char *rval;
int len;
len = EXTRACT24(errpkt->start);
if ((rval = (char *) MXS_MALLOC(len)) == NULL)
{
return NULL;
}
memcpy(rval, (char *) (errpkt->start) + 7, 6);
rval[6] = ' ';
// message size is len - (1 byte field count + 2 bytes errno + 6 bytes status)
memcpy(&rval[7], (char *) (errpkt->start) + 13, len - 9);
rval[len - 2] = 0;
return rval;
}
*/
/**
* Error Reply routine
*
* The routine will reply to client errors and/or closing the session
* or try to open a new backend connection.
*
* @param instance The router instance
* @param router_session The router session
* @param message The error message to reply
* @param backend_dcb The backend DCB
* @param action The action: ERRACT_NEW_CONNECTION or ERRACT_REPLY_CLIENT
* @param succp Result of action: true iff router can continue
*
*/
static void
errorReply(MXS_ROUTER *instance, MXS_ROUTER_SESSION *router_session, GWBUF *message, DCB *backend_dcb,
mxs_error_action_t action,
bool *succp)
{
/** We should never end up here */
ss_dassert(false);
}
static uint64_t getCapabilities(MXS_ROUTER* instance)
{
return RCAP_TYPE_NONE;
}
/**
* The stats gathering function called from the housekeeper so that we
* can get timed averages of binlog records shippped
*
* @param inst The router instance
*/
/*
static void
stats_func(void *inst)
{
AVRO_INSTANCE *router = (AVRO_INSTANCE *) inst;
AVRO_CLIENT *client;
router->stats.minavgs[router->stats.minno++]
= router->stats.n_binlogs - router->stats.lastsample;
router->stats.lastsample = router->stats.n_binlogs;
if (router->stats.minno == AVRO_NSTATS_MINUTES)
{
router->stats.minno = 0;
}
spinlock_acquire(&router->lock);
client = router->clients;
while (client)
{
client->stats.minavgs[client->stats.minno++]
= client->stats.n_events - client->stats.lastsample;
client->stats.lastsample = client->stats.n_events;
if (client->stats.minno == AVRO_NSTATS_MINUTES)
{
client->stats.minno = 0;
}
client = client->next;
}
spinlock_release(&router->lock);
}
*/
/**
* Conversion task: MySQL binlogs to AVRO files
*/
void converter_func(void* data)
{
AVRO_INSTANCE* router = (AVRO_INSTANCE*) data;
bool ok = true;
avro_binlog_end_t binlog_end = AVRO_OK;
while (!router->service->svc_do_shutdown && ok && binlog_end == AVRO_OK)
{
uint64_t start_pos = router->current_pos;
char binlog_name[BINLOG_FNAMELEN + 1];
strcpy(binlog_name, router->binlog_name);
if (avro_open_binlog(router->binlogdir, router->binlog_name, &router->binlog_fd))
{
binlog_end = avro_read_all_events(router);
if (router->current_pos != start_pos || strcmp(binlog_name, router->binlog_name) != 0)
{
/** We processed some data, reset the conversion task delay */
router->task_delay = 1;
/** Update the GTID index */
avro_update_index(router);
}
avro_close_binlog(router->binlog_fd);
}
else
{
binlog_end = AVRO_BINLOG_ERROR;
}
}
/** We reached end of file, flush unwritten records to disk */
if (router->task_delay == 1)
{
avro_flush_all_tables(router, AVROROUTER_FLUSH);
avro_save_conversion_state(router);
}
if (binlog_end == AVRO_LAST_FILE)
{
router->task_delay = MXS_MIN(router->task_delay + 1, AVRO_TASK_DELAY_MAX);
if (conversion_task_ctl(router, true))
{
MXS_INFO("Stopped processing file %s at position %lu. Waiting until"
" more data is written before continuing. Next check in %d seconds.",
router->binlog_name, router->current_pos, router->task_delay);
}
}
}
/**
* @brief Ensure directory exists and is writable
*
* TODO: Move this as a function in the core
*
* @param path Path to directory
* @param mode One of O_RDONLY, O_WRONLY or O_RDWR
* @return True if directory exists and can be opened with @p mode permission
*/
static bool ensure_dir_ok(const char* path, int mode)
{
bool rval = false;
if (path)
{
char resolved[PATH_MAX + 1];
const char *rp = realpath(path, resolved);
if (rp == NULL && errno == ENOENT)
{
rp = path;
}
if (rp)
{
/** Make sure the directory exists */
if (mkdir(rp, 0774) == 0 || errno == EEXIST)
{
if (access(rp, mode) == 0)
{
rval = true;
}
else
{
MXS_ERROR("Failed to access directory '%s': %d, %s", rp,
errno, mxs_strerror(errno));
}
}
else
{
MXS_ERROR("Failed to create directory '%s': %d, %s", rp,
errno, mxs_strerror(errno));
}
}
else
{
MXS_ERROR("Failed to resolve real path name for '%s': %d, %s", path,
errno, mxs_strerror(errno));
}
}
return rval;
}
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