/* Helloworld module -- A few examples of the Redis Modules API in the form * of commands showing how to accomplish common tasks. * * This module does not do anything useful, if not for a few commands. The * examples are designed in order to show the API. * * ----------------------------------------------------------------------------- * * Copyright (c) 2016, Salvatore Sanfilippo * 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. */ #define REDISMODULE_EXPERIMENTAL_API #include #include #include #include #include "../redismodule.h" /* HELLO.SIMPLE is among the simplest commands you can implement. * It just returns the currently selected DB id, a functionality which is * missing in Redis. The command uses two important API calls: one to * fetch the currently selected DB, the other in order to send the client * an integer reply as response. */ int HelloSimple_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { REDISMODULE_NOT_USED(argv); REDISMODULE_NOT_USED(argc); RedisModule_ReplyWithLongLong(ctx, RedisModule_GetSelectedDb(ctx)); return REDISMODULE_OK; } int HelloNotify_Callback(RedisModuleCtx *ctx, int type, const char *event, RedisModuleString *key) { REDISMODULE_NOT_USED(ctx); REDISMODULE_NOT_USED(ctx); RedisModule_Log(ctx, "notice", "Received notification! Event type: %d, event: %s, key: %s", type, event, RedisModule_StringPtrLen(key, NULL)); RedisModule_Call(ctx, "SET", "cc", "foo", "bar"); return REDISMODULE_OK; } /* 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) { if (RedisModule_Init(ctx, "notify", 1, REDISMODULE_APIVER_1) == REDISMODULE_ERR) return REDISMODULE_ERR; REDISMODULE_NOT_USED(argv); REDISMODULE_NOT_USED(argc); RedisModule_SubscribeToKeyspaceEvents(ctx, REDISMODULE_NOTIFY_ALL, HelloNotify_Callback); return REDISMODULE_OK; }