Function initSentinel

app/redis-6.2.6/src/sentinel.c:509–550

Perform the Sentinel mode initialization. */

/* Perform the Sentinel mode initialization. */
void initSentinel(void) {
    unsigned int j;

    /* Remove usual Redis commands from the command table, then just add
     * the SENTINEL command. */
    dictEmpty(server.commands,NULL);
    dictEmpty(server.orig_commands,NULL);
    ACLClearCommandID();
    for (j = 0; j < sizeof(sentinelcmds)/sizeof(sentinelcmds[0]); j++) {
        int retval;
        struct redisCommand *cmd = sentinelcmds+j;
        cmd->id = ACLGetCommandID(cmd->name); /* Assign the ID used for ACL. */
        retval = dictAdd(server.commands, sdsnew(cmd->name), cmd);
        serverAssert(retval == DICT_OK);
        retval = dictAdd(server.orig_commands, sdsnew(cmd->name), cmd);
        serverAssert(retval == DICT_OK);

        /* Translate the command string flags description into an actual
         * set of flags. */
        if (populateCommandTableParseFlags(cmd,cmd->sflags) == C_ERR)
            serverPanic("Unsupported command flag");
    }

    /* Initialize various data structures. */
    sentinel.current_epoch = 0;
    sentinel.masters = dictCreate(&instancesDictType,NULL);
    sentinel.tilt = 0;
    sentinel.tilt_start_time = 0;
    sentinel.previous_time = mstime();
    sentinel.running_scripts = 0;
    sentinel.scripts_queue = listCreate();
    sentinel.announce_ip = NULL;
    sentinel.announce_port = 0;
    sentinel.simfailure_flags = SENTINEL_SIMFAILURE_NONE;
    sentinel.deny_scripts_reconfig = SENTINEL_DEFAULT_DENY_SCRIPTS_RECONFIG;
    sentinel.sentinel_auth_pass = NULL;
    sentinel.sentinel_auth_user = NULL;
    sentinel.resolve_hostnames = SENTINEL_DEFAULT_RESOLVE_HOSTNAMES;
    sentinel.announce_hostnames = SENTINEL_DEFAULT_ANNOUNCE_HOSTNAMES;
    memset(sentinel.myid,0,sizeof(sentinel.myid));
    server.sentinel_config = NULL;
}

/* This function is for checking whether sentinel config file has been set,
 * also checking whether we have write permissions. */