mod_tile config parsing

[pnorman]

Fetching tiles at /buildingclip does not work with this renderd.conf

[renderd]
stats_file=/var/run/renderd/renderd.stats
socketname=/var/run/renderd/renderd.sock
num_threads=4
tile_dir=/var/lib/mod_tile

[mapnik]
plugins_dir=/usr/lib/mapnik/input
font_dir=/usr/share/fonts/truetype/
font_dir_recurse=true

[default]
URI=/osm/
XML=/home/ubuntu/mapnik-stylesheets/osm.xml

[carto]
URI=/carto/
XML=/home/ubuntu/openstreetmap-carto/osm-carto.xml

[noamenity]
XML=/home/ubuntu/openstreetmap-carto/noamenity.xml

[nolandcover]
XML=/home/ubuntu/openstreetmap-carto/nolandcover.xml

[roadbbox]
XML=/home/ubuntu/openstreetmap-carto/roadbbox.xml

[z14road]
XML=/home/ubuntu/openstreetmap-carto/z14_road.xml

[buildingclip]
URI=/buildingclip/
XML=/home/ubuntu/openstreetmap-carto/building_clip.xml

But it does work with this second renderd.conf

[renderd]
stats_file=/var/run/renderd/renderd.stats
socketname=/var/run/renderd/renderd.sock
num_threads=4
tile_dir=/var/lib/mod_tile

[mapnik]
plugins_dir=/usr/lib/mapnik/input
font_dir=/usr/share/fonts/truetype/
font_dir_recurse=true

[default]
URI=/osm/
XML=/home/ubuntu/mapnik-stylesheets/osm.xml

[carto]
URI=/carto/
XML=/home/ubuntu/openstreetmap-carto/osm-carto.xml

[buildingclip]
URI=/buildingclip/
XML=/home/ubuntu/openstreetmap-carto/building_clip.xml

[noamenity]
XML=/home/ubuntu/openstreetmap-carto/noamenity.xml

[nolandcover]
XML=/home/ubuntu/openstreetmap-carto/nolandcover.xml

[roadbbox]
XML=/home/ubuntu/openstreetmap-carto/roadbbox.xml

[z14road]
XML=/home/ubuntu/openstreetmap-carto/z14_road.xml

The only difference is that the buildingclip style has been moved up. Perhaps the styles with no URI parameter are screwing up the config parsing?

Both config files result in a line with [notice] Loading tile config buildingclip at /buildingclip/ for zooms 0 - 18 from tile directory /var/lib/mod_tile with extension .png and mime type image/png

Adding AddTileConfig /buildingclip/ buildingclip to the apache config for the first renderd.conf causes it to work.

[hummeltech]

This is still an issue, if you do not specify a URI value, it will resolve to /:

mod_tile/src/mod_tile.c

Lines 1885 to 1886 in e8ac8f1

	if (baseuri_len == 0) {
	baseuri = apr_pstrdup(cmd->pool, "/");

This is problematic as it causes the tile_translate function to catch every URI (thereby skipping all subsequent map config sections):

mod_tile/src/mod_tile.c

Line 1081 in e8ac8f1

if (!strncmp(tile_config->baseuri, r->uri, strlen(tile_config->baseuri))) {

It will return DECLINED while attempting to determine which map config section/handler/etc. to be used as it does not follow the expected format string:

mod_tile/src/mod_tile.c

Lines 1098 to 1116 in e8ac8f1

	if (tile_config->enableOptions) {
	cmd->ver = PROTO_VER;
	n = sscanf(r->uri + strlen(tile_config->baseuri), "%40[^/]/%d/%d/%d.%255[a-z]/%10s", parameters, &(cmd->z), &(cmd->x), &(cmd->y), extension, option);
	if (n < 5) {
	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "tile_translate: Invalid URL for tilelayer %s with options", tile_config->xmlname);
	return DECLINED;
	}
	} else {
	cmd->ver = 2;
	n = sscanf(r->uri + strlen(tile_config->baseuri), "%d/%d/%d.%255[a-z]/%10s", &(cmd->z), &(cmd->x), &(cmd->y), extension, option);
	if (n < 4) {
	ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "tile_translate: Invalid URL for tilelayer %s without options", tile_config->xmlname);
	return DECLINED;
	}
	parameters[0] = 0;
	}

---

Example log entries with 3 renderd.conf map sections, the second of which having no URI specified:

172.18.0.2:8081 172.18.0.1 - - [28/May/2025:08:01:39 -0700] "GET /tiles/renderd-example-webp/5/4/14.webp HTTP/1.1" 404 490 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0"

[Wed May 28 08:01:39.513509 2025] [tile:debug] [pid 14:tid 25] mod_tile.c(1051): [client 172.18.0.1:45486] tile_translate: uri(/tiles/renderd-example-webp/5/4/14.webp)
[Wed May 28 08:01:39.513611 2025] [tile:debug] [pid 14:tid 25] mod_tile.c(1078): [client 172.18.0.1:45486] tile_translate: testing baseuri(/tiles/renderd-example/) name(example-map) extension(png)
[Wed May 28 08:01:39.513629 2025] [tile:debug] [pid 14:tid 25] mod_tile.c(1078): [client 172.18.0.1:45486] tile_translate: testing baseuri(/) name(example-map-jpg) extension(jpg)
[Wed May 28 08:01:39.513643 2025] [tile:debug] [pid 14:tid 25] mod_tile.c(1111): [client 172.18.0.1:45486] tile_translate: Invalid URL for tilelayer example-map-jpg without options