[GCM] Add port 443 fallback logic and histograms

google_apis/gcm/engine/connection_factory_impl_unittest.cc

 // Copyright (c) 2013 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.
 
 #include "google_apis/gcm/engine/connection_factory_impl.h"
 
 #include <cmath>
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "net/base/backoff_entry.h"
 #include "net/http/http_network_session.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class Policy;
 
 namespace gcm {
 namespace {
 
 const char kMCSEndpoint[] = "http://my.server";
+const char kMCSEndpoint2[] = "http://my.alt.server";
 
 const int kBackoffDelayMs = 1;
 const int kBackoffMultiplier = 2;
 
 // A backoff policy with small enough delays that tests aren't burdened.
 const net::BackoffEntry::Policy kTestBackoffPolicy = {
   // Number of initial errors (in sequence) to ignore before applying
   // exponential back-off rules.
   0,
 
@@ skipping 11 matching lines @@
   10,
 
   // Time to keep an entry from being discarded even when it
   // has no significant state, -1 to never discard.
   -1,
 
   // Don't use initial delay unless the last request was an error.
   false,
 };
 
+std::vector<GURL> BuildEndpoints() {
+  std::vector<GURL> endpoints;
+  endpoints.push_back(GURL(kMCSEndpoint));
+  endpoints.push_back(GURL(kMCSEndpoint2));
+  return endpoints;
+}
+
 // Helper for calculating total expected exponential backoff delay given an
 // arbitrary number of failed attempts. See BackoffEntry::CalculateReleaseTime.
 double CalculateBackoff(int num_attempts) {
   double delay = kBackoffDelayMs;
   for (int i = 1; i < num_attempts; ++i) {
     delay += kBackoffDelayMs * pow(static_cast<double>(kBackoffMultiplier),
                                    i - 1);
   }
   DVLOG(1) << "Expected backoff " << delay << " milliseconds.";
   return delay;
@@ skipping 62 matching lines @@
   int num_expected_attempts_;
   // Whether all expected connection attempts have been fulfilled since an
   // expectation was last set.
   bool connections_fulfilled_;
   // Callback to invoke when all connection attempts have been made.
   base::Closure finished_callback_;
 };
 
 TestConnectionFactoryImpl::TestConnectionFactoryImpl(
     const base::Closure& finished_callback)
-    : ConnectionFactoryImpl(GURL(kMCSEndpoint),
+    : ConnectionFactoryImpl(BuildEndpoints(),
                             net::BackoffEntry::Policy(),
                             NULL,
                             NULL),
       connect_result_(net::ERR_UNEXPECTED),
       num_expected_attempts_(0),
       connections_fulfilled_(true),
       finished_callback_(finished_callback) {
   // Set a non-null time.
   tick_clock_.Advance(base::TimeDelta::FromMilliseconds(1));
 }
@@ skipping 101 matching lines @@
 
 // An initial successful connection should not result in backoff.
 TEST_F(ConnectionFactoryImplTest, ConnectSuccess) {
   factory()->Initialize(
       ConnectionFactory::BuildLoginRequestCallback(),
       ConnectionHandler::ProtoReceivedCallback(),
       ConnectionHandler::ProtoSentCallback());
   factory()->SetConnectResult(net::OK);
   factory()->Connect();
   EXPECT_TRUE(factory()->NextRetryAttempt().is_null());
+  EXPECT_EQ(factory()->GetCurrentEndpoint(), BuildEndpoints()[0]);
 }
 
-// A connection failure should result in backoff.
+// A connection failure should result in backoff, and attempting the fallback
+// endpoint next.
 TEST_F(ConnectionFactoryImplTest, ConnectFail) {
   factory()->Initialize(
       ConnectionFactory::BuildLoginRequestCallback(),
       ConnectionHandler::ProtoReceivedCallback(),
       ConnectionHandler::ProtoSentCallback());
   factory()->SetConnectResult(net::ERR_CONNECTION_FAILED);
   factory()->Connect();
   EXPECT_FALSE(factory()->NextRetryAttempt().is_null());
+  EXPECT_EQ(factory()->GetCurrentEndpoint(), BuildEndpoints()[1]);
 }
 
 // A connection success after a failure should reset backoff.
 TEST_F(ConnectionFactoryImplTest, FailThenSucceed) {
   factory()->Initialize(
       ConnectionFactory::BuildLoginRequestCallback(),
       ConnectionHandler::ProtoReceivedCallback(),
       ConnectionHandler::ProtoSentCallback());
   factory()->SetConnectResult(net::ERR_CONNECTION_FAILED);
   base::TimeTicks connect_time = factory()->tick_clock()->NowTicks();
@@ skipping 135 matching lines @@
   factory()->SignalConnectionReset(ConnectionFactory::SOCKET_FAILURE);
   EXPECT_NE(retry_time, factory()->NextRetryAttempt());
   retry_time = factory()->NextRetryAttempt();
   EXPECT_FALSE(retry_time.is_null());
   EXPECT_GE((retry_time - connect_time).InMilliseconds(),
             CalculateBackoff(3));
 }
 
 }  // namespace
 }  // namespace gcm