/* Helloworld cluster -- A ping/pong cluster API example. * * ----------------------------------------------------------------------------- * * 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. */ #include "../redismodule.h" #include #include #include #include #define MSGTYPE_PING 1 #define MSGTYPE_PONG 2 /* HELLOCLUSTER.PINGALL */ int PingallCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { REDISMODULE_NOT_USED(argv); REDISMODULE_NOT_USED(argc); RedisModule_SendClusterMessage(ctx,NULL,MSGTYPE_PING,"Hey",3); return RedisModule_ReplyWithSimpleString(ctx, "OK"); } /* HELLOCLUSTER.LIST */ int ListCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { REDISMODULE_NOT_USED(argv); REDISMODULE_NOT_USED(argc); size_t numnodes; char **ids = RedisModule_GetClusterNodesList(ctx,&numnodes); if (ids == NULL) { return RedisModule_ReplyWithError(ctx,"Cluster not enabled"); } RedisModule_ReplyWithArray(ctx,numnodes); for (size_t j = 0; j < numnodes; j++) { int port; RedisModule_GetClusterNodeInfo(ctx,ids[j],NULL,NULL,&port,NULL); RedisModule_ReplyWithArray(ctx,2); RedisModule_ReplyWithStringBuffer(ctx,ids[j],REDISMODULE_NODE_ID_LEN); RedisModule_ReplyWithLongLong(ctx,port); } RedisModule_FreeClusterNodesList(ids); return REDISMODULE_OK; } /* Callback for message MSGTYPE_PING */ void PingReceiver(RedisModuleCtx *ctx, const char *sender_id, uint8_t type, const unsigned char *payload, uint32_t len) { RedisModule_Log(ctx,"notice","PING (type %d) RECEIVED from %.*s: '%.*s'", type,REDISMODULE_NODE_ID_LEN,sender_id,(int)len, payload); RedisModule_SendClusterMessage(ctx,NULL,MSGTYPE_PONG,"Ohi!",4); RedisModuleCallReply *reply = RedisModule_Call(ctx, "INCR", "c", "pings_received"); RedisModule_FreeCallReply(reply); } /* Callback for message MSGTYPE_PONG. */ void PongReceiver(RedisModuleCtx *ctx, const char *sender_id, uint8_t type, const unsigned char *payload, uint32_t len) { RedisModule_Log(ctx,"notice","PONG (type %d) RECEIVED from %.*s: '%.*s'", type,REDISMODULE_NODE_ID_LEN,sender_id,(int)len, payload); } /* 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,"hellocluster",1,REDISMODULE_APIVER_1) == REDISMODULE_ERR) return REDISMODULE_ERR; if (RedisModule_CreateCommand(ctx,"hellocluster.pingall", PingallCommand_RedisCommand,"readonly",0,0,0) == REDISMODULE_ERR) return REDISMODULE_ERR; if (RedisModule_CreateCommand(ctx,"hellocluster.list", ListCommand_RedisCommand,"readonly",0,0,0) == REDISMODULE_ERR) return REDISMODULE_ERR; /* Disable Redis Cluster sharding and redirections. This way every node * will be able to access every possible key, regardless of the hash slot. * This way the PING message handler will be able to increment a specific * variable. Normally you do that in order for the distributed system * you create as a module to have total freedom in the keyspace * manipulation. */ RedisModule_SetClusterFlags(ctx,REDISMODULE_CLUSTER_FLAG_NO_REDIRECTION); /* Register our handlers for different message types. */ RedisModule_RegisterClusterMessageReceiver(ctx,MSGTYPE_PING,PingReceiver); RedisModule_RegisterClusterMessageReceiver(ctx,MSGTYPE_PONG,PongReceiver); return REDISMODULE_OK; }