Function lookup_map

modules/mappers/mod_rewrite.c:1744–1931

* generic map lookup */

 * generic map lookup
 */
static char *lookup_map(request_rec *r, char *name, char *key)
{
    rewrite_server_conf *conf;
    rewritemap_entry *s;
    char *value;
    apr_finfo_t st;
    apr_status_t rv;

    /* get map configuration */
    conf = ap_get_module_config(r->server->module_config, &rewrite_module);
    s = apr_hash_get(conf->rewritemaps, name, APR_HASH_KEY_STRING);

    /* map doesn't exist */
    if (!s) {
        return NULL;
    }

    switch (s->type) {
    /*
     * Text file map (perhaps random)
     */
    case MAPTYPE_RND:
    case MAPTYPE_TXT:
        rv = apr_stat(&st, s->checkfile, APR_FINFO_MIN, r->pool);
        if (rv != APR_SUCCESS) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(00661)
                          "mod_rewrite: can't access text RewriteMap file %s",
                          s->checkfile);
            return NULL;
        }

        value = get_cache_value(s->cachename, st.mtime, key, r->pool);
        if (!value) {
            rewritelog(r, 6, NULL,
                       "cache lookup FAILED, forcing new map lookup");
            
            value = lookup_map_txtfile(r, s->datafile, key);
            if (!value) {
                rewritelog(r, 5, NULL, "map lookup FAILED: map=%s[txt] key=%s",
                           name, key);
                set_cache_value(s->cachename, st.mtime, key, "");
                return NULL;
            }

            rewritelog(r, 5, NULL, "map lookup OK: map=%s[txt] key=%s -> val=%s",
                       name, key, value);
            set_cache_value(s->cachename, st.mtime, key, value);
        }
        else {
            rewritelog(r, 5, NULL, "cache lookup OK: map=%s[txt] key=%s -> val=%s",
                       name, key, value);
        }

        if (s->type == MAPTYPE_RND && *value) {
            value = select_random_value_part(r, value);
            rewritelog(r, 5, NULL, "randomly chosen the subvalue `%s'",value);
        }