/* Hellodict -- An example of modules dictionary API * * This module implements a volatile key-value store on top of the * dictionary exported by the Redis modules API. * * ----------------------------------------------------------------------------- * * Copyright (c) 2018, 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 "../redismodule.h" #include #include #include #include static RedisModuleDict *Keyspace; /* HELLODICT.SET * * Set the specified key to the specified value. */ int cmd_SET(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { if (argc != 3) return RedisModule_WrongArity(ctx); RedisModule_DictSet(Keyspace,argv[1],argv[2]); /* We need to keep a reference to the value stored at the key, otherwise * it would be freed when this callback returns. */ RedisModule_RetainString(NULL,argv[2]); return RedisModule_ReplyWithSimpleString(ctx, "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) { REDISMODULE_NOT_USED(argv); REDISMODULE_NOT_USED(argc); if (RedisModule_Init(ctx,"hellodict",1,REDISMODULE_APIVER_1) == REDISMODULE_ERR) return REDISMODULE_ERR; if (RedisModule_CreateCommand(ctx,"hellodict.set", cmd_SET,"write deny-oom",1,1,0) == REDISMODULE_ERR) return REDISMODULE_ERR; /* Create our global dictionray. Here we'll set our keys and values. */ Keyspace = RedisModule_CreateDict(NULL); return REDISMODULE_OK; }