Function execCommand

app/redis-6.2.6/src/multi.c:159–277

}

void execCommand(client *c) {
    int j;
    robj **orig_argv;
    int orig_argc;
    struct redisCommand *orig_cmd;
    int was_master = server.masterhost == NULL;

    if (!(c->flags & CLIENT_MULTI)) {
        addReplyError(c,"EXEC without MULTI");
        return;
    }

    /* EXEC with expired watched key is disallowed*/
    if (isWatchedKeyExpired(c)) {
        c->flags |= (CLIENT_DIRTY_CAS);
    }

    /* Check if we need to abort the EXEC because:
     * 1) Some WATCHed key was touched.
     * 2) There was a previous error while queueing commands.
     * A failed EXEC in the first case returns a multi bulk nil object
     * (technically it is not an error but a special behavior), while
     * in the second an EXECABORT error is returned. */
    if (c->flags & (CLIENT_DIRTY_CAS | CLIENT_DIRTY_EXEC)) {
        if (c->flags & CLIENT_DIRTY_EXEC) {
            addReplyErrorObject(c, shared.execaborterr);
        } else {
            addReply(c, shared.nullarray[c->resp]);
        }

        discardTransaction(c);
        return;
    }

    uint64_t old_flags = c->flags;

    /* we do not want to allow blocking commands inside multi */
    c->flags |= CLIENT_DENY_BLOCKING;

    /* Exec all the queued commands */
    unwatchAllKeys(c); /* Unwatch ASAP otherwise we'll waste CPU cycles */

    server.in_exec = 1;

    orig_argv = c->argv;
    orig_argc = c->argc;
    orig_cmd = c->cmd;
    addReplyArrayLen(c,c->mstate.count);
    for (j = 0; j < c->mstate.count; j++) {
        c->argc = c->mstate.commands[j].argc;
        c->argv = c->mstate.commands[j].argv;
        c->cmd = c->mstate.commands[j].cmd;

        /* ACL permissions are also checked at the time of execution in case
         * they were changed after the commands were queued. */
        int acl_errpos;
        int acl_retval = ACLCheckAllPerm(c,&acl_errpos);
        if (acl_retval != ACL_OK) {