mirror of
https://github.com/fluencelabs/redis
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79 lines
3.6 KiB
C
79 lines
3.6 KiB
C
/* Helloworld module -- A few examples of the Redis Modules API in the form
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* of commands showing how to accomplish common tasks.
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*
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* This module does not do anything useful, if not for a few commands. The
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* examples are designed in order to show the API.
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*
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* -----------------------------------------------------------------------------
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*
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* Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define REDISMODULE_EXPERIMENTAL_API
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../redismodule.h"
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/* HELLO.SIMPLE is among the simplest commands you can implement.
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* It just returns the currently selected DB id, a functionality which is
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* missing in Redis. The command uses two important API calls: one to
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* fetch the currently selected DB, the other in order to send the client
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* an integer reply as response. */
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int HelloSimple_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv,
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int argc) {
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REDISMODULE_NOT_USED(argv);
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REDISMODULE_NOT_USED(argc);
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RedisModule_ReplyWithLongLong(ctx, RedisModule_GetSelectedDb(ctx));
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return REDISMODULE_OK;
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}
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int HelloNotify_Callback(RedisModuleCtx *ctx, int type, const char *event, RedisModuleString *key) {
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REDISMODULE_NOT_USED(ctx);
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REDISMODULE_NOT_USED(ctx);
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RedisModule_Log(ctx,
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"notice",
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"Received notification! Event type: %d, event: %s, key: %s",
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type, event, RedisModule_StringPtrLen(key, NULL));
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RedisModule_Call(ctx, "SET", "cc", "foo", "bar");
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return REDISMODULE_OK;
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}
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/* This function must be present on each Redis module. It is used in order to
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* register the commands into the Redis server. */
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int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv,
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int argc) {
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if (RedisModule_Init(ctx, "notify", 1, REDISMODULE_APIVER_1) ==
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REDISMODULE_ERR)
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return REDISMODULE_ERR;
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REDISMODULE_NOT_USED(argv);
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REDISMODULE_NOT_USED(argc);
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RedisModule_SubscribeToKeyspaceEvents(ctx, REDISMODULE_NOTIFY_ALL, HelloNotify_Callback);
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return REDISMODULE_OK;
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} |