/* Helloworld cluster -- A ping/pong cluster API example. * * ----------------------------------------------------------------------------- * * Copyright (c) 2018-Present, Redis Ltd. * All rights reserved. * * Licensed under your choice of the Redis Source Available License 2.0 * (RSALv2) or the Server Side Public License v1 (SSPLv1). */ #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; }