Function streamCreateCG

app/redis-6.2.6/src/t_stream.c:2267–2278

Create a new consumer group in the context of the stream 's', having the * specified name and last server ID. If a consumer group with the same name * already existed NULL is returned, otherwise the pointer to the consumer * group is returned. */

 * already existed NULL is returned, otherwise the pointer to the consumer
 * group is returned. */
streamCG *streamCreateCG(stream *s, char *name, size_t namelen, streamID *id) {
    if (s->cgroups == NULL) s->cgroups = raxNew();
    if (raxFind(s->cgroups,(unsigned char*)name,namelen) != raxNotFound)
        return NULL;

    streamCG *cg = zmalloc(sizeof(*cg));
    cg->pel = raxNew();
    cg->consumers = raxNew();
    cg->last_id = *id;
    raxInsert(s->cgroups,(unsigned char*)name,namelen,cg,NULL);
    return cg;
}

/* Free a consumer group and all its associated data. */
void streamFreeCG(streamCG *cg) {