Fork runtest.py and everything it needs src-side for easier hacking

infra/scripts/legacy/scripts/slave/gtest/networktransaction.py

Index: infra/scripts/legacy/scripts/slave/gtest/networktransaction.py
diff --git a/infra/scripts/legacy/scripts/slave/gtest/networktransaction.py b/infra/scripts/legacy/scripts/slave/gtest/networktransaction.py
new file mode 100644
index 0000000000000000000000000000000000000000..10327cb1c3adc8215a77ebf20ad7aef3aeb575c2
--- /dev/null
+++ b/infra/scripts/legacy/scripts/slave/gtest/networktransaction.py
@@ -0,0 +1,46 @@
+# Copyright (c) 2011 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
+import urllib2
+
+
+class NetworkTimeout(Exception):
+  pass
+
+
+class NetworkTransaction(object):
+  def __init__(self, initial_backoff_seconds=10, grown_factor=1.5,
+               timeout_seconds=(10 * 60), convert_404_to_None=False):
+    self._initial_backoff_seconds = initial_backoff_seconds
+    self._backoff_seconds = initial_backoff_seconds
+    self._grown_factor = grown_factor
+    self._timeout_seconds = timeout_seconds
+    self._convert_404_to_None = convert_404_to_None
+    self._total_sleep = 0
+
+  def run(self, request):
+    self._total_sleep = 0
+    self._backoff_seconds = self._initial_backoff_seconds
+    while True:
+      try:
+        return request()
+      except urllib2.HTTPError, e:
+        if self._convert_404_to_None and e.code == 404:
+          return None
+        self._check_for_timeout()
+        logging.warn("Received HTTP status %s loading \"%s\".  "
+                    "Retrying in %s seconds...",
+                    e.code, e.filename, self._backoff_seconds)
+        self._sleep()
+
+  def _check_for_timeout(self):
+    if self._total_sleep + self._backoff_seconds > self._timeout_seconds:
+      raise NetworkTimeout()
+
+  def _sleep(self):
+    time.sleep(self._backoff_seconds)
+    self._total_sleep += self._backoff_seconds
+    self._backoff_seconds *= self._grown_factor