1 /* Timer API example -- Register and handle timer events
2 *
3 * -----------------------------------------------------------------------------
4 *
5 * Copyright (c) 2018, Salvatore Sanfilippo <antirez at gmail dot com>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * * Neither the name of Redis nor the names of its contributors may be used
17 * to endorse or promote products derived from this software without
18 * specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #define REDISMODULE_EXPERIMENTAL_API
34 #include "../redismodule.h"
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <ctype.h>
38 #include <string.h>
39
40 /* Timer callback. */
timerHandler(RedisModuleCtx * ctx,void * data)41 void timerHandler(RedisModuleCtx *ctx, void *data) {
42 REDISMODULE_NOT_USED(ctx);
43 printf("Fired %s!\n", data);
44 RedisModule_Free(data);
45 }
46
47 /* HELLOTIMER.TIMER*/
TimerCommand_RedisCommand(RedisModuleCtx * ctx,RedisModuleString ** argv,int argc)48 int TimerCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
49 REDISMODULE_NOT_USED(argv);
50 REDISMODULE_NOT_USED(argc);
51
52 for (int j = 0; j < 10; j++) {
53 int delay = rand() % 5000;
54 char *buf = RedisModule_Alloc(256);
55 snprintf(buf,256,"After %d", delay);
56 RedisModuleTimerID tid = RedisModule_CreateTimer(ctx,delay,timerHandler,buf);
57 REDISMODULE_NOT_USED(tid);
58 }
59 return RedisModule_ReplyWithSimpleString(ctx, "OK");
60 }
61
62 /* This function must be present on each Redis module. It is used in order to
63 * register the commands into the Redis server. */
RedisModule_OnLoad(RedisModuleCtx * ctx,RedisModuleString ** argv,int argc)64 int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
65 REDISMODULE_NOT_USED(argv);
66 REDISMODULE_NOT_USED(argc);
67
68 if (RedisModule_Init(ctx,"hellotimer",1,REDISMODULE_APIVER_1)
69 == REDISMODULE_ERR) return REDISMODULE_ERR;
70
71 if (RedisModule_CreateCommand(ctx,"hellotimer.timer",
72 TimerCommand_RedisCommand,"readonly",0,0,0) == REDISMODULE_ERR)
73 return REDISMODULE_ERR;
74
75 return REDISMODULE_OK;
76 }
77