Add tsproxy logging

telemetry/telemetry/internal/util/ts_proxy_server.py

 # Copyright 2016 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.
 
 """Start and stop tsproxy."""
 
 import logging
 import os
 import re
 import subprocess
 import sys
+import tempfile
 
 from py_utils import atexit_with_log
 from telemetry.core import util
 
 import py_utils
 
 
 _TSPROXY_PATH = os.path.join(
     util.GetTelemetryThirdPartyDir(), 'tsproxy', 'tsproxy.py')
 
@@ skipping 35 matching lines @@
     """Start TsProxy server and verify that it started.
     """
     cmd_line = [sys.executable, _TSPROXY_PATH]
     cmd_line.extend([
         '--port=0'])  # Use port 0 so tsproxy picks a random available port.
     if self._host_ip:
       cmd_line.append('--desthost=%s' % self._host_ip)
     if self._http_port:
       cmd_line.append(
           '--mapports=443:%s,*:%s' % (self._https_port, self._http_port))
+
+    tf = tempfile.NamedTemporaryFile(delete=False)
+    tf.close()
+    temp_path = tf.name
+    print 'Pipe tsproxy log to %s' % temp_path
+    cmd_line.append('--logfile=%s' % temp_path)
+    cmd_line.append('-vvv')
     logging.info('Tsproxy commandline: %r' % cmd_line)
     self._proc = subprocess.Popen(
         cmd_line, stdout=subprocess.PIPE, stdin=subprocess.PIPE,
         stderr=subprocess.PIPE, bufsize=1)
     atexit_with_log.Register(self.StopServer)
     try:
       py_utils.WaitFor(self._IsStarted, timeout)
       logging.info('TsProxy port: %s', self._port)
       self._is_running = True
     except py_utils.TimeoutException:
@@ skipping 59 matching lines @@
     return err
 
   def __enter__(self):
     """Add support for with-statement."""
     self.StartServer()
     return self
 
   def __exit__(self, unused_exc_type, unused_exc_val, unused_exc_tb):
     """Add support for with-statement."""
     self.StopServer()