A caching proxy for geo tiles, as used by Vici.org.
The core for this service is in the webserver configuration:
location ~ ^/(.*)$ {
try_files $uri /tiles/$1 @tiles;
}
location @tiles {
fastcgi_pass php:9000;
fastcgi_param SCRIPT_FILENAME /var/www/domain.host.tiles/src/controller.php;
fastcgi_param QUERY_STRING q=$uri&$args;
include fastcgi_params;
}
The try_files directive will return the image from disk, and only when it is not there, controller.php is called.
The controller uses the configuration in config/tileproxy.json. See the example tileproxy.json_example.
The controller wil try to download the tile from the provided source, send it to the user and store in on disk.
Next time the same tile is requested, it will be simply served by the webserver.
In the setup used by Vici.org, the tiles are not in the webroot, but in a subdirectory named tiles, which is essentially a remote mount.
This directory is defined in "baseDir" in config/tileproxy.json.
In nginx, this configuration is supported by the /tiles/$1 parameter for try_files.