Function make_servers_ids

modules/proxy/mod_proxy_balancer.c:815–857

* First try to compute an unique ID for each vhost with minimal criteria, * that is the first Host/IP:port and ServerName. For most cases this should * be enough and avoids changing the ID unnecessarily across restart (or * stop/start w.r.t. persisted files) for things that this module does not * care about. * * But if it's not enough (collisions) do a second pass for the full monty, * that

 * solely on this ID and resets them if the sizes don't match.
 */
static apr_array_header_t *make_servers_ids(server_rec *main_s, apr_pool_t *p)
{
    server_rec *s = main_s;
    apr_array_header_t *ids = apr_array_make(p, 10, sizeof(const char *));
    apr_hash_t *dups = apr_hash_make(p);
    int idx, *dup, full_monty = 0;
    const char *id;

    for (idx = 0, s = main_s; s; s = s->next, ++idx) {
        id = make_server_id(s, p, 0);
        dup = apr_hash_get(dups, id, APR_HASH_KEY_STRING);
        apr_hash_set(dups, id, APR_HASH_KEY_STRING,
                     apr_pmemdup(p, &idx, sizeof(int)));
        if (dup) {
            full_monty = 1;
            APR_ARRAY_IDX(ids, *dup, const char *) = NULL;
            APR_ARRAY_PUSH(ids, const char *) = NULL;
        }
        else {
            APR_ARRAY_PUSH(ids, const char *) = id;
        }
    }
    if (full_monty) {
        apr_hash_clear(dups);
        for (idx = 0, s = main_s; s; s = s->next, ++idx) {
            id = APR_ARRAY_IDX(ids, idx, const char *);
            if (id) {
                /* Preserve non-duplicates */
                continue;
            }
            id = make_server_id(s, p, 1);
            if (apr_hash_get(dups, id, APR_HASH_KEY_STRING)) {
                id = apr_psprintf(p, "%s_%x", id, idx);
            }
            else {
                apr_hash_set(dups, id, APR_HASH_KEY_STRING, (void *)-1);
            }
            APR_ARRAY_IDX(ids, idx, const char *) = id;
        }
    }

    return ids;
}

/* post_config hook: */
static int balancer_post_config(apr_pool_t *pconf, apr_pool_t *plog,