user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    tcp_nopush      on;

    keepalive_timeout  65;

    gzip              on;
    gzip_vary         on;
    gzip_proxied      any;
    gzip_comp_level   6;
    gzip_buffers      16 8k;
    gzip_http_version 1.1;
    gzip_min_length   256;
    gzip_types        text/plain text/css text/xml text/javascript application/x-javascript
                      application/xml application/javascript application/json application/x-protobuf;

    proxy_cache_path    /var/cache/nginx/
                        levels=1:2
                        max_size=10g
                        inactive=60m
                        use_temp_path=off
                        keys_zone=tiles_cache:10m;

    upstream martin_upstream {
        server martin:3000;
    }

    server {
        listen 80;
        resolver 127.0.0.11;

        location ~ /tiles/(?<fwd_path>.*) {
            proxy_set_header    Host $host;
            proxy_set_header    X-Real-IP $remote_addr;
            proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header    X-Forwarded-Host $host;
            proxy_set_header    X-Rewrite-URL $request_uri;
            proxy_redirect      off;

            proxy_connect_timeout   15m;
            proxy_send_timeout      15m;
            proxy_read_timeout      15m;
            send_timeout            15m;

            proxy_cache             tiles_cache;
            proxy_cache_lock        on;
            proxy_cache_revalidate  on;

            # Set caching time for responses
            proxy_cache_valid       200 204 302 1h;
            proxy_cache_valid       404 1m;

            proxy_cache_use_stale   error timeout http_500 http_502 http_503 http_504;
            add_header              X-Cache-Status $upstream_cache_status;

            proxy_pass              http://martin_upstream/$fwd_path$is_args$args;
        }
    }
}