Add Web Page Replay support.

scripts/slave/webpagereplay.py

Index: scripts/slave/webpagereplay.py
===================================================================
--- scripts/slave/webpagereplay.py	(revision 0)
+++ scripts/slave/webpagereplay.py	(revision 0)
@@ -0,0 +1,65 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import logging
+import os
+import signal
+import subprocess
+import time
+import urllib
+
+class ReplayLauncher:
+  HTTP_PORT = 8080
+  HTTPS_PORT = 8413
+  UP_URL = 'http://localhost:%s/web-page-replay-generate-200' % HTTP_PORT
+
+  def __init__(self, replay_dir, data_dir, log_dir):
+    self.replay_dir = replay_dir
+    self.data_dir = data_dir
+    self.log_dir = log_dir
+    self.log_fh = None
+    self.proxy_process = None
+
+  def StartServer(self):
+    logging.debug('Starting Web-Page-Replay')
+    cmd_line = [
+        os.path.join(self.replay_dir, 'replay.py'),
+        '--no-dns_forwarding',
+        '--port', str(self.HTTP_PORT),
+        '--ssl_port', str(self.HTTPS_PORT),
+        # TODO(slamm): Add traffic shaping (requires root): '--net', 'fios',
+        os.path.join(self.data_dir, '2012Q2', 'data.wpr')
+        ]
+    if not os.path.exists(self.log_dir):
+      os.makedirs(self.log_dir)
+    log_name = os.path.join(self.log_dir, 'log.txt')
+    self.log_fh = open(log_name, 'w')
+    self.proxy_process = subprocess.Popen(
+      cmd_line, stdout=self.log_fh, stderr=subprocess.STDOUT)
+    if not self.IsStarted():
+      raise Exception('Web Page Replay failed to start. See the log file: ' +
+                      log_name)
+
+  def IsStarted(self):
+    for _ in range(5):
+      if self.proxy_process.poll() is not None:
+        # The process has exited.
+        break
+      try:
+        if 200 == urllib.urlopen(self.UP_URL, None, {}).getcode():
+          return True
+      except IOError:
+        time.sleep(1)
+    self.StopServer()
+    return False
+
+  def StopServer(self):
+    if self.proxy_process:
+      logging.debug('Stopping Web-Page-Replay')
+      # Use a SIGINT here so that it can do graceful cleanup.
+      # Otherwise, we will leave subprocesses hanging.
+      self.proxy_process.send_signal(signal.SIGINT)
+      self.proxy_process.wait()
+    if self.log_fh:
+      self.log_fh.close()