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Diffstat (limited to 'tests/modules/hooks.c')
| -rw-r--r-- | tests/modules/hooks.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/tests/modules/hooks.c b/tests/modules/hooks.c new file mode 100644 index 0000000..94d902d --- /dev/null +++ b/tests/modules/hooks.c @@ -0,0 +1,353 @@ +/* This module is used to test the server events hooks API. + * + * ----------------------------------------------------------------------------- + * + * Copyright (c) 2019, Salvatore Sanfilippo <antirez at gmail dot com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Redis nor the names of its contributors may be used + * to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include "redismodule.h" +#include <stdio.h> +#include <string.h> + +/* We need to store events to be able to test and see what we got, and we can't + * store them in the key-space since that would mess up rdb loading (duplicates) + * and be lost of flushdb. */ +RedisModuleDict *event_log = NULL; + +typedef struct EventElement { + long count; + RedisModuleString *last_val_string; + long last_val_int; +} EventElement; + +void LogStringEvent(RedisModuleCtx *ctx, const char* keyname, const char* data) { + EventElement *event = RedisModule_DictGetC(event_log, (void*)keyname, strlen(keyname), NULL); + if (!event) { + event = RedisModule_Alloc(sizeof(EventElement)); + memset(event, 0, sizeof(EventElement)); + RedisModule_DictSetC(event_log, (void*)keyname, strlen(keyname), event); + } + if (event->last_val_string) RedisModule_FreeString(ctx, event->last_val_string); + event->last_val_string = RedisModule_CreateString(ctx, data, strlen(data)); + event->count++; +} + +void LogNumericEvent(RedisModuleCtx *ctx, const char* keyname, long data) { + REDISMODULE_NOT_USED(ctx); + EventElement *event = RedisModule_DictGetC(event_log, (void*)keyname, strlen(keyname), NULL); + if (!event) { + event = RedisModule_Alloc(sizeof(EventElement)); + memset(event, 0, sizeof(EventElement)); + RedisModule_DictSetC(event_log, (void*)keyname, strlen(keyname), event); + } + event->last_val_int = data; + event->count++; +} + +void FreeEvent(RedisModuleCtx *ctx, EventElement *event) { + if (event->last_val_string) + RedisModule_FreeString(ctx, event->last_val_string); + RedisModule_Free(event); +} + +int cmdEventCount(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) +{ + if (argc != 2){ + RedisModule_WrongArity(ctx); + return REDISMODULE_OK; + } + + EventElement *event = RedisModule_DictGet(event_log, argv[1], NULL); + RedisModule_ReplyWithLongLong(ctx, event? event->count: 0); + return REDISMODULE_OK; +} + +int cmdEventLast(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) +{ + if (argc != 2){ + RedisModule_WrongArity(ctx); + return REDISMODULE_OK; + } + + EventElement *event = RedisModule_DictGet(event_log, argv[1], NULL); + if (event && event->last_val_string) + RedisModule_ReplyWithString(ctx, event->last_val_string); + else if (event) + RedisModule_ReplyWithLongLong(ctx, event->last_val_int); + else + RedisModule_ReplyWithNull(ctx); + return REDISMODULE_OK; +} + +void clearEvents(RedisModuleCtx *ctx) +{ + RedisModuleString *key; + EventElement *event; + RedisModuleDictIter *iter = RedisModule_DictIteratorStart(event_log, "^", NULL); + while((key = RedisModule_DictNext(ctx, iter, (void**)&event)) != NULL) { + event->count = 0; + event->last_val_int = 0; + if (event->last_val_string) RedisModule_FreeString(ctx, event->last_val_string); + event->last_val_string = NULL; + RedisModule_DictDel(event_log, key, NULL); + RedisModule_Free(event); + } + RedisModule_DictIteratorStop(iter); +} + +int cmdEventsClear(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) +{ + REDISMODULE_NOT_USED(argc); + REDISMODULE_NOT_USED(argv); + clearEvents(ctx); + return REDISMODULE_OK; +} + +/* Client state change callback. */ +void clientChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + + RedisModuleClientInfo *ci = data; + char *keyname = (sub == REDISMODULE_SUBEVENT_CLIENT_CHANGE_CONNECTED) ? + "client-connected" : "client-disconnected"; + LogNumericEvent(ctx, keyname, ci->id); +} + +void flushdbCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + + RedisModuleFlushInfo *fi = data; + char *keyname = (sub == REDISMODULE_SUBEVENT_FLUSHDB_START) ? + "flush-start" : "flush-end"; + LogNumericEvent(ctx, keyname, fi->dbnum); +} + +void roleChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + + RedisModuleReplicationInfo *ri = data; + char *keyname = (sub == REDISMODULE_EVENT_REPLROLECHANGED_NOW_MASTER) ? + "role-master" : "role-replica"; + LogStringEvent(ctx, keyname, ri->masterhost); +} + +void replicationChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + + char *keyname = (sub == REDISMODULE_SUBEVENT_REPLICA_CHANGE_ONLINE) ? + "replica-online" : "replica-offline"; + LogNumericEvent(ctx, keyname, 0); +} + +void rasterLinkChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + + char *keyname = (sub == REDISMODULE_SUBEVENT_MASTER_LINK_UP) ? + "masterlink-up" : "masterlink-down"; + LogNumericEvent(ctx, keyname, 0); +} + +void persistenceCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + + char *keyname = NULL; + switch (sub) { + case REDISMODULE_SUBEVENT_PERSISTENCE_RDB_START: keyname = "persistence-rdb-start"; break; + case REDISMODULE_SUBEVENT_PERSISTENCE_AOF_START: keyname = "persistence-aof-start"; break; + case REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_AOF_START: keyname = "persistence-syncaof-start"; break; + case REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_RDB_START: keyname = "persistence-syncrdb-start"; break; + case REDISMODULE_SUBEVENT_PERSISTENCE_ENDED: keyname = "persistence-end"; break; + case REDISMODULE_SUBEVENT_PERSISTENCE_FAILED: keyname = "persistence-failed"; break; + } + /* modifying the keyspace from the fork child is not an option, using log instead */ + RedisModule_Log(ctx, "warning", "module-event-%s", keyname); + if (sub == REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_RDB_START || + sub == REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_AOF_START) + { + LogNumericEvent(ctx, keyname, 0); + } +} + +void loadingCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + + char *keyname = NULL; + switch (sub) { + case REDISMODULE_SUBEVENT_LOADING_RDB_START: keyname = "loading-rdb-start"; break; + case REDISMODULE_SUBEVENT_LOADING_AOF_START: keyname = "loading-aof-start"; break; + case REDISMODULE_SUBEVENT_LOADING_REPL_START: keyname = "loading-repl-start"; break; + case REDISMODULE_SUBEVENT_LOADING_ENDED: keyname = "loading-end"; break; + case REDISMODULE_SUBEVENT_LOADING_FAILED: keyname = "loading-failed"; break; + } + LogNumericEvent(ctx, keyname, 0); +} + +void loadingProgressCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + + RedisModuleLoadingProgress *ei = data; + char *keyname = (sub == REDISMODULE_SUBEVENT_LOADING_PROGRESS_RDB) ? + "loading-progress-rdb" : "loading-progress-aof"; + LogNumericEvent(ctx, keyname, ei->progress); +} + +void shutdownCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(data); + REDISMODULE_NOT_USED(sub); + + RedisModule_Log(ctx, "warning", "module-event-%s", "shutdown"); +} + +void cronLoopCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(sub); + + RedisModuleCronLoop *ei = data; + LogNumericEvent(ctx, "cron-loop", ei->hz); +} + +void moduleChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + + RedisModuleModuleChange *ei = data; + char *keyname = (sub == REDISMODULE_SUBEVENT_MODULE_LOADED) ? + "module-loaded" : "module-unloaded"; + LogStringEvent(ctx, keyname, ei->module_name); +} + +void swapDbCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + REDISMODULE_NOT_USED(sub); + + RedisModuleSwapDbInfo *ei = data; + LogNumericEvent(ctx, "swapdb-first", ei->dbnum_first); + LogNumericEvent(ctx, "swapdb-second", ei->dbnum_second); +} + +void configChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data) +{ + REDISMODULE_NOT_USED(e); + if (sub != REDISMODULE_SUBEVENT_CONFIG_CHANGE) { + return; + } + + RedisModuleConfigChangeV1 *ei = data; + LogNumericEvent(ctx, "config-change-count", ei->num_changes); + LogStringEvent(ctx, "config-change-first", ei->config_names[0]); +} + +/* This function must be present on each Redis module. It is used in order to + * register the commands into the Redis server. */ +int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { +#define VerifySubEventSupported(e, s) \ + if (!RedisModule_IsSubEventSupported(e, s)) { \ + return REDISMODULE_ERR; \ + } + + REDISMODULE_NOT_USED(argv); + REDISMODULE_NOT_USED(argc); + + if (RedisModule_Init(ctx,"testhook",1,REDISMODULE_APIVER_1) + == REDISMODULE_ERR) return REDISMODULE_ERR; + + /* Example on how to check if a server sub event is supported */ + if (!RedisModule_IsSubEventSupported(RedisModuleEvent_ReplicationRoleChanged, REDISMODULE_EVENT_REPLROLECHANGED_NOW_MASTER)) { + return REDISMODULE_ERR; + } + + /* replication related hooks */ + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_ReplicationRoleChanged, roleChangeCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_ReplicaChange, replicationChangeCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_MasterLinkChange, rasterLinkChangeCallback); + + /* persistence related hooks */ + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_Persistence, persistenceCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_Loading, loadingCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_LoadingProgress, loadingProgressCallback); + + /* other hooks */ + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_ClientChange, clientChangeCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_FlushDB, flushdbCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_Shutdown, shutdownCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_CronLoop, cronLoopCallback); + + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_ModuleChange, moduleChangeCallback); + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_SwapDB, swapDbCallback); + + RedisModule_SubscribeToServerEvent(ctx, + RedisModuleEvent_Config, configChangeCallback); + + event_log = RedisModule_CreateDict(ctx); + + if (RedisModule_CreateCommand(ctx,"hooks.event_count", cmdEventCount,"",0,0,0) == REDISMODULE_ERR) + return REDISMODULE_ERR; + if (RedisModule_CreateCommand(ctx,"hooks.event_last", cmdEventLast,"",0,0,0) == REDISMODULE_ERR) + return REDISMODULE_ERR; + if (RedisModule_CreateCommand(ctx,"hooks.clear", cmdEventsClear,"",0,0,0) == REDISMODULE_ERR) + return REDISMODULE_ERR; + + return REDISMODULE_OK; +} + +int RedisModule_OnUnload(RedisModuleCtx *ctx) { + clearEvents(ctx); + RedisModule_FreeDict(ctx, event_log); + event_log = NULL; + return REDISMODULE_OK; +} + |