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Filename : hellotimer.c
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/* Timer API example -- Register and handle timer events
 *
 * -----------------------------------------------------------------------------
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

/* Timer callback. */
void timerHandler(RedisModuleCtx *ctx, void *data) {
    REDISMODULE_NOT_USED(ctx);
    printf("Fired %s!\n", (char *)data);
    RedisModule_Free(data);
}

/* HELLOTIMER.TIMER*/
int TimerCommand_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
    REDISMODULE_NOT_USED(argv);
    REDISMODULE_NOT_USED(argc);

    for (int j = 0; j < 10; j++) {
        int delay = rand() % 5000;
        char *buf = RedisModule_Alloc(256);
        snprintf(buf,256,"After %d", delay);
        RedisModuleTimerID tid = RedisModule_CreateTimer(ctx,delay,timerHandler,buf);
        REDISMODULE_NOT_USED(tid);
    }
    return RedisModule_ReplyWithSimpleString(ctx, "OK");
}

/* 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,"hellotimer",1,REDISMODULE_APIVER_1)
        == REDISMODULE_ERR) return REDISMODULE_ERR;

    if (RedisModule_CreateCommand(ctx,"hellotimer.timer",
        TimerCommand_RedisCommand,"readonly",0,0,0) == REDISMODULE_ERR)
        return REDISMODULE_ERR;

    return REDISMODULE_OK;
}