// SPDX-FileCopyrightText: 2024 Hiredict Contributors // SPDX-FileCopyrightText: 2024 Salvatore Sanfilippo // // SPDX-License-Identifier: BSD-3-Clause // SPDX-License-Identifier: LGPL-3.0-or-later #include #include #include #include #include #include #include void debugCallback(redisAsyncContext *c, void *r, void *privdata) { (void)privdata; //unused redisReply *reply = r; if (reply == NULL) { /* The DEBUG SLEEP command will almost always fail, because we have set a 1 second timeout */ printf("`DEBUG SLEEP` error: %s\n", c->errstr ? c->errstr : "unknown error"); return; } /* Disconnect after receiving the reply of DEBUG SLEEP (which will not)*/ redisAsyncDisconnect(c); } void getCallback(redisAsyncContext *c, void *r, void *privdata) { redisReply *reply = r; if (reply == NULL) { if (c->errstr) { printf("errstr: %s\n", c->errstr); } return; } printf("argv[%s]: %s\n", (char*)privdata, reply->str); /* start another request that demonstrate timeout */ redisAsyncCommand(c, debugCallback, NULL, "DEBUG SLEEP %f", 1.5); } void connectCallback(const redisAsyncContext *c, int status) { if (status != REDIS_OK) { printf("Error: %s\n", c->errstr); return; } printf("Connected...\n"); } void disconnectCallback(const redisAsyncContext *c, int status) { if (status != REDIS_OK) { printf("Error: %s\n", c->errstr); return; } printf("Disconnected...\n"); } /* * This example requires Redis 7.0 or above. * * 1- Compile this file as a shared library. Directory of "redismodule.h" must * be in the include path. * gcc -fPIC -shared -I../../redis/src/ -I.. example-redismoduleapi.c -o example-redismoduleapi.so * * 2- Load module: * redis-server --loadmodule ./example-redismoduleapi.so value */ int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) { int ret = RedisModule_Init(ctx, "example-redismoduleapi", 1, REDISMODULE_APIVER_1); if (ret != REDISMODULE_OK) { printf("error module init \n"); return REDISMODULE_ERR; } if (redisModuleCompatibilityCheck() != REDIS_OK) { printf("Redis 7.0 or above is required! \n"); return REDISMODULE_ERR; } redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379); if (c->err) { /* Let *c leak for now... */ printf("Error: %s\n", c->errstr); return 1; } size_t len; const char *val = RedisModule_StringPtrLen(argv[argc-1], &len); RedisModuleCtx *module_ctx = RedisModule_GetDetachedThreadSafeContext(ctx); redisModuleAttach(c, module_ctx); redisAsyncSetConnectCallback(c,connectCallback); redisAsyncSetDisconnectCallback(c,disconnectCallback); redisAsyncSetTimeout(c, (struct timeval){ .tv_sec = 1, .tv_usec = 0}); /* In this demo, we first `set key`, then `get key` to demonstrate the basic usage of the adapter. Then in `getCallback`, we start a `debug sleep` command to create 1.5 second long request. Because we have set a 1 second timeout to the connection, the command will always fail with a timeout error, which is shown in the `debugCallback`. */ redisAsyncCommand(c, NULL, NULL, "SET key %b", val, len); redisAsyncCommand(c, getCallback, (char*)"end-1", "GET key"); return 0; }