Integration test for Chrome-Proxy: pass-through directive

tools/chrome_proxy/integration_tests/chrome_proxy_metrics.py

 # Copyright 2014 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 time
 
 from common import chrome_proxy_metrics
 from common import network_metrics
 from common.chrome_proxy_metrics import ChromeProxyMetricException
@@ skipping 243 matching lines @@
       raise ChromeProxyMetricException, (
           'Expected at least one LoFi response, but zero such responses were '
           'received.')
 
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'lo_fi_request', 'count', lo_fi_request_count))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'lo_fi_response', 'count', lo_fi_response_count))
     super(ChromeProxyMetric, self).AddResults(tab, results)
 
+  def AddResultsForPassThrough(self, tab, results):
+    compressed_count = 0
+    compressed_size = 0
+    pass_through_count = 0
+    pass_through_size = 0
+
+    for resp in self.IterResponses(tab):
+      if 'favicon.ico' in resp.response.url:
+        continue
+      if not resp.HasChromeProxyViaHeader():
+        r = resp.response
+        raise ChromeProxyMetricException, (
+            '%s: Should have Via header (%s) (refer=%s, status=%d)' % (
+                r.url, r.GetHeader('Via'), r.GetHeader('Referer'), r.status))
+      if resp.HasChromeProxyPassThroughRequest():
+        pass_through_count += 1
+        pass_through_size = resp.content_length
+      else:
+        compressed_count += 1
+        compressed_size = resp.content_length
+
+    if pass_through_count != 1:
+      raise ChromeProxyMetricException, (
+          'Expected exactly one Chrome-Proxy pass-through request, but %d '
+          'such requests were sent.' % (pass_through_count))
+
+    if compressed_count != 1:
+      raise ChromeProxyMetricException, (
+          'Expected exactly one compressed request, but %d such requests were '
+          'received.' % (compressed_count))
+
+    if compressed_size >= pass_through_size:
+        raise ChromeProxyMetricException, (
+            'Compressed image is %d bytes and pass-through image is %d. '
+            'Expecting compressed image size to be less than pass-through '
+            'image.' % (compressed_size, pass_through_size))
+
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'compressed', 'count', compressed_count))
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'compressed_size', 'bytes', compressed_size))
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'pass_through', 'count', pass_through_count))
+    results.AddValue(scalar.ScalarValue(
+        results.current_page, 'pass_through_size', 'bytes', pass_through_size))
+
   def AddResultsForBypass(self, tab, results):
     bypass_count = 0
 
     for resp in self.IterResponses(tab):
       if resp.HasChromeProxyViaHeader():
         r = resp.response
         raise ChromeProxyMetricException, (
             '%s: Should not have Via header (%s) (refer=%s, status=%d)' % (
                 r.url, r.GetHeader('Via'), r.GetHeader('Referer'), r.status))
       bypass_count += 1
@@ skipping 236 matching lines @@
         via_count += 1
     if via_count == 0:
       raise ChromeProxyMetricException, (
           'Expected at least one response through the proxy after the bypass '
           'expired, but zero such responses were received.')
 
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'bypass', 'count', bypass_count))
     results.AddValue(scalar.ScalarValue(
         results.current_page, 'via', 'count', via_count))