Expose renderer settings in the environment config files

These are: metatile, bufferSize and cache_ttl

NEWS.md

@@ -2,6 +2,7 @@
 -----
 * Do not let /etc/services confuse FD checker (munin plugin)
 * Multilayer support (#72)
+* Expose renderer settings in the environment config files
 
 1.1.6 (19//02//13)
 -----

config/environments/development.js.example

@@ -29,6 +29,12 @@ var config = {
         max_size: 500
     }
     ,mapnik_version: undefined
+    ,renderer: {
+      // Milliseconds since last access before renderer cache item expires
+      cache_ttl: 60000,
+      metatile: 4,
+      bufferSize: 64
+    }
     ,millstone: {
         cache_basedir: '/tmp/cdb-tiler-dev/millstone-dev'
     }

config/environments/production.js.example

@@ -23,6 +23,12 @@ var config = {
         max_size: 500
     }
     ,mapnik_version: undefined
+    ,renderer: {
+      // Milliseconds since last access before renderer cache item expires
+      cache_ttl: 60000,
+      metatile: 4,
+      bufferSize: 64
+    }
     ,millstone: {
         cache_basedir: '/home/ubuntu/tile_assets/'
     }

config/environments/staging.js.example

@@ -23,6 +23,12 @@ var config = {
         max_size: 500
     }
     ,mapnik_version: undefined
+    ,renderer: {
+      // Milliseconds since last access before renderer cache item expires
+      cache_ttl: 60000,
+      metatile: 4,
+      bufferSize: 64
+    }
     ,millstone: {
         cache_basedir: '/home/ubuntu/tile_assets/'
     }

config/environments/test.js.example

@@ -23,6 +23,12 @@ var config = {
         max_size: 500
     }
     ,mapnik_version: '2.0.2'
+    ,renderer: {
+      // Milliseconds since last access before renderer cache item expires
+      cache_ttl: 60000,
+      metatile: 4,
+      bufferSize: 64
+    }
     ,millstone: {
         cache_basedir: '/tmp/cdb-tiler-test/millstone'
     }

lib/cartodb/server_options.js

@@ -6,6 +6,13 @@ var   _          = require('underscore')
   ;
 
 module.exports = function(){
+
+    var rendererConfig = _.defaults(global.environment.renderer || {}, {
+      cache_ttl: 60000,
+      metatile: 4,
+      bufferSize: 64
+    });
+
     var me = {
         base_url: '/tiles/:table',
         base_url_notable: '/tiles',
@@ -14,6 +21,13 @@ module.exports = function(){
           cachedir: global.environment.millstone.cache_basedir,
           mapnik_version: global.environment.mapnik_version || mapnik.versions.mapnik
         },
+        mapnik: {
+          metatile: rendererConfig.metatile,
+          bufferSize: rendererConfig.bufferSize
+        },
+        renderCache: {
+          ttl: rendererConfig.cache_ttl
+        },
         redis: global.environment.redis,
         enable_cors: global.environment.enable_cors,
         varnish_host: global.environment.varnish.host,