Function xdelCommand

app/redis-6.2.6/src/t_stream.c:3200–3234

XDEL [ ... ] * * Removes the specified entries from the stream. Returns the number * of items actually deleted, that may be different from the number * of IDs passed in case certain IDs do not exist. */

 * of items actually deleted, that may be different from the number
 * of IDs passed in case certain IDs do not exist. */
void xdelCommand(client *c) {
    robj *o;

    if ((o = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL
        || checkType(c,o,OBJ_STREAM)) return;
    stream *s = o->ptr;

    /* We need to sanity check the IDs passed to start. Even if not
     * a big issue, it is not great that the command is only partially
     * executed because at some point an invalid ID is parsed. */
    streamID static_ids[STREAMID_STATIC_VECTOR_LEN];
    streamID *ids = static_ids;
    int id_count = c->argc-2;
    if (id_count > STREAMID_STATIC_VECTOR_LEN)
        ids = zmalloc(sizeof(streamID)*id_count);
    for (int j = 2; j < c->argc; j++) {
        if (streamParseStrictIDOrReply(c,c->argv[j],&ids[j-2],0) != C_OK) goto cleanup;
    }

    /* Actually apply the command. */
    int deleted = 0;
    for (int j = 2; j < c->argc; j++) {
        deleted += streamDeleteItem(s,&ids[j-2]);
    }

    /* Propagate the write if needed. */
    if (deleted) {
        signalModifiedKey(c,c->db,c->argv[1]);
        notifyKeyspaceEvent(NOTIFY_STREAM,"xdel",c->argv[1],c->db->id);
        server.dirty += deleted;
    }
    addReplyLongLong(c,deleted);
cleanup:
    if (ids != static_ids) zfree(ids);
}

/* General form: XTRIM <key> [... options ...]
 *