Change image compression plugin to use janus-image-worker.

config/default.yml

@@ -135,6 +135,8 @@ cache:
 # Image compression settings.
 imgcompression:
   enabled: true
+  # Use libjpeg-turbo instead of mozjpeg.
+  turbo: true
 
 # Adblock settings.
 adblock:

lib/plugins/imgcompression.js

@@ -1,11 +1,8 @@
 'use strict';
 
-var fs = require('fs');
-var temp = require ('temp');
-var execFile = require('child_process').execFile;
-var jpegtran = require('mozjpeg-bin').jpegtran;
-var pngquant = require('pngquant-bin').path;
-var imgtype = require('imagetype');
+var spawn = require('child_process').spawn;
+var config = require('config');
+var imageWorker = require('janus-image-worker');
 
 var log = require('../log');
 
@@ -13,77 +10,37 @@ var NAME = exports.name = 'imgcompression';
 
 var metrics = require('../metrics').session(NAME);
 
-// Send processed image from given path to the given destination.
-function sendImage(source, dest, path) {
-  fs.stat(path, function(err, stats) {
-    var finalize = function() {
-      fs.unlink(path);
-    };
-
-    if (source.headers['content-length']) {
-      var origLength = parseInt(source.headers['content-length']);
-      var newLength = stats.size.toString();
-
-      source.headers['content-length'] = newLength;
-
-      metrics.count('in', origLength);
-      metrics.count('out', newLength);
-    }
-
-    var imageFile = fs.createReadStream(path);
-
-    dest.writeHead(source.statusCode, source.headers);
-    imageFile.pipe(dest);
-
-    dest.on('end', finalize);
-    dest.on('close', finalize);
-    dest.on('error', finalize);
-  });
-}
-
 exports.handleResponse = function(request, source, dest) {
-  // If this is an image we first write it into a file, then optimize it
-  // and send it.
   if (source.headers['content-type'] === 'image/jpeg' ||
       source.headers['content-type'] === 'image/png') {
 
-    var path = temp.path();
-    var optPath = path + '.opt';
-    var imageFile = fs.createWriteStream(path);
+    metrics.count('hit');
 
-    source.pipe(imageFile);
+    var args = ['--small'];
 
-    imageFile.on('finish', function() {
-      // We need to check the actual type of the downloaded image.
-      // Some websites (e.g. mozilla.org) are sending JPEGs as PNGs.
-      imgtype(path, function(type) {
-        if (type === 'png') {
-          execFile(pngquant,
-                   ['--skip-if-larger', '-o', optPath, path],
-                   function(err) {
-                     if (err) {
-                       sendImage(source, dest, path);
-                     } else {
-                       sendImage(source, dest, optPath);
-                       fs.unlink(path);
+    if (config.imgcompression.turbo) {
+      args[0] = '--fast';
     }
+
+    delete source.headers['content-length'];
+    dest.writeHead(source.statusCode, source.headers);
+
+    var child = spawn(imageWorker.bin,
+                      args,
+                      {
+                        stdio: 'pipe',
+                        env: { LD_LIBRARY_PATH: imageWorker.libraryPath }
                       });
-        } else if (type === 'jpeg') {
-          execFile(jpegtran,
-                   ['-outfile', optPath, path],
-                   function(err, stdout, stderr) {
-                     if (err) {
-                       log.error('mozjpeg error: ', stderr);
-                       sendImage(source, dest, path);
-                     } else {
-                       sendImage(source, dest, optPath);
-                       fs.unlink(path);
-                     }
-                   });
-        } else {
-          sendImage(source, dest, path);
-        }
+
+    source.pipe(child.stdin);
+    child.stdout.pipe(dest);
+
+    child.stderr.on('data', function(data) {
+      log.info(data.toString());
     });
+
+    child.stdin.on('error', function(data) {
+      log.error(data.toString());
     });
   } else {
     source.forward(dest);

package.json

@@ -31,15 +31,14 @@
     "hiredis": "^0.1.17",
     "iconv": "^2.1.4",
     "imagetype": "^0.3.0",
+    "janus-image-worker": "git+https://github.com/mozilla/janus-image-worker.git",
     "js-yaml": "^3.0.2",
     "lzma-native": "^0.1.2",
     "marionette-client": "^1.1.8",
     "memory-cache": "0.0.5",
     "memwatch": "^0.2.2",
-    "mozjpeg-bin": "^0.2.0",
     "node-statsd": "0.0.7",
     "png": "~3.0.3",
-    "pngquant-bin": "^0.3.1",
     "redis": "^0.10.3",
     "spdy": "~1.27.0",
     "sprintf-js": "0.0.7",