Display filesizes of the mbtiles

public/templates/index.tmpl

@@ -47,7 +47,7 @@
           <div class="sample-img"></div>
         {{/if}}
         <h3>{{name}}</h3>
-        <p>Id: {{@key}} | {{#is_vector}}Vector{{/is_vector}}{{^is_vector}}Raster{{/is_vector}} data | <a href="/data/{{@key}}.json">TileJSON</a></p>
+        <p>Id: {{@key}} |{{#if formatted_filesize}} {{formatted_filesize}} |{{/if}} {{#is_vector}}Vector{{/is_vector}}{{^is_vector}}Raster{{/is_vector}} data | <a href="/data/{{@key}}.json">TileJSON</a></p>
         {{#is_vector}}
         <a class="btn" href="/data/{{@key}}/{{viewer_hash}}">X-Ray viewer</a>
         {{/is_vector}}

src/serve_data.js

@@ -1,6 +1,7 @@
 'use strict';
 
 var crypto = require('crypto'),
+    fs = require('fs'),
     path = require('path');
 
 var clone = require('clone'),
@@ -12,15 +13,14 @@ var utils = require('./utils');
 module.exports = function(options, repo, params, id) {
   var app = express().disable('x-powered-by');
 
-  var mbtilesFile = params.mbtiles;
+  var mbtilesFile = path.join(options.paths.mbtiles, params.mbtiles);
   var tileJSON = {
     'tiles': params.domains || options.domains
   };
 
   repo[id] = tileJSON;
 
-  var source = new mbtiles(path.join(options.paths.mbtiles, mbtilesFile),
-                           function(err) {
+  var source = new mbtiles(mbtilesFile, function(err) {
     source.getInfo(function(err, info) {
       tileJSON['name'] = id;
       tileJSON['format'] = 'pbf';
@@ -29,6 +29,7 @@ module.exports = function(options, repo, params, id) {
 
       tileJSON['tilejson'] = '2.0.0';
       tileJSON['basename'] = id;
+      tileJSON['filesize'] = fs.statSync(mbtilesFile)['size'];
 
       Object.assign(tileJSON, params.tilejson || {});
       utils.fixTileJSONCenter(tileJSON);

src/server.js

@@ -214,6 +214,19 @@ module.exports = function(opts, callback) {
               Math.floor(centerPx[1] / 256) + '.' + data_.format;
         }
       }
+      if (data_.filesize) {
+        var suffix = 'kB';
+        var size = parseInt(data_.filesize, 10) / 1024;
+        if (size > 1024) {
+          suffix = 'MB';
+          size /= 1024;
+        }
+        if (size > 1024) {
+          suffix = 'GB';
+          size /= 1024;
+        }
+        data_.formatted_filesize = size.toFixed(2) + ' ' + suffix;
+      }
     });
     return {
       styles: styles,