chrome/browser/sync/test/integration/sync_exponential_backoff_test.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/bind.h"
   6 #include "chrome/browser/sync/test/integration/bookmarks_helper.h"
   7 #include "chrome/browser/sync/test/integration/profile_sync_service_harness.h"
   8 #include "chrome/browser/sync/test/integration/retry_verifier.h"
   9 #include "chrome/browser/sync/test/integration/status_change_checker.h"
  10 #include "chrome/browser/sync/test/integration/sync_test.h"
  11
  12 namespace {
  13
  14 using bookmarks_helper::AddFolder;
  15 using bookmarks_helper::ModelMatchesVerifier;
  16 using syncer::sessions::SyncSessionSnapshot;
  17
  18 class SyncExponentialBackoffTest : public SyncTest {
  19  public:
  20   SyncExponentialBackoffTest() : SyncTest(SINGLE_CLIENT) {}
  21   virtual ~SyncExponentialBackoffTest() {}
  22
  23  private:
  24   DISALLOW_COPY_AND_ASSIGN(SyncExponentialBackoffTest);
  25 };
  26
  27 // Helper class that checks if a sync client has successfully gone through
  28 // exponential backoff after it encounters an error.
  29 class ExponentialBackoffChecker : public StatusChangeChecker {
  30  public:
  31   explicit ExponentialBackoffChecker(const ProfileSyncServiceHarness* harness)
  32       : StatusChangeChecker("ExponentialBackoffChecker"),
  33         harness_(harness) {
  34     DCHECK(harness);
  35     const SyncSessionSnapshot& snap = harness_->GetLastSessionSnapshot();
  36     retry_verifier_.Initialize(snap);
  37   }
  38
  39   virtual ~ExponentialBackoffChecker() {}
  40
  41   // Checks if backoff is complete. Called repeatedly each time PSS notifies
  42   // observers of a state change.
  43   virtual bool IsExitConditionSatisfied() OVERRIDE {
  44     const SyncSessionSnapshot& snap = harness_->GetLastSessionSnapshot();
  45     retry_verifier_.VerifyRetryInterval(snap);
  46     return (retry_verifier_.done() && retry_verifier_.Succeeded());
  47   }
  48
  49  private:
  50   // The sync client for which backoff is being verified.
  51   const ProfileSyncServiceHarness* harness_;
  52
  53   // Keeps track of the number of attempts at exponential backoff and its
  54   // related bookkeeping information for verification.
  55   RetryVerifier retry_verifier_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(ExponentialBackoffChecker);
  58 };
  59
  60 IN_PROC_BROWSER_TEST_F(SyncExponentialBackoffTest, OfflineToOnline) {
  61   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
  62
  63   // Add an item and ensure that sync is successful.
  64   ASSERT_TRUE(AddFolder(0, 0, L"folder1"));
  65   ASSERT_TRUE(GetClient(0)->AwaitFullSyncCompletion());
  66
  67   // Trigger a network error at the client side.
  68   DisableNetwork(GetProfile(0));
  69
  70   // Add a new item to trigger another sync cycle.
  71   ASSERT_TRUE(AddFolder(0, 0, L"folder2"));
  72
  73   // Verify that the client goes into exponential backoff while it is unable to
  74   // reach the sync server.
  75   ExponentialBackoffChecker exponential_backoff_checker(GetClient(0));
  76   ASSERT_TRUE(GetClient(0)->AwaitStatusChange(&exponential_backoff_checker,
  77                                               "Checking exponential backoff"));
  78
  79   // Recover from the network error.
  80   EnableNetwork(GetProfile(0));
  81
  82   // Verify that sync was able to recover.
  83   ASSERT_TRUE(GetClient(0)->AwaitFullSyncCompletion());
  84   ASSERT_TRUE(ModelMatchesVerifier(0));
  85 }
  86
  87 IN_PROC_BROWSER_TEST_F(SyncExponentialBackoffTest, TransientErrorTest) {
  88   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
  89
  90   // Add an item and ensure that sync is successful.
  91   ASSERT_TRUE(AddFolder(0, 0, L"folder1"));
  92   ASSERT_TRUE(GetClient(0)->AwaitFullSyncCompletion());
  93
  94   // Trigger a transient error on the server.
  95   TriggerTransientError();
  96
  97   // Add a new item to trigger another sync cycle.
  98   ASSERT_TRUE(AddFolder(0, 0, L"folder2"));
  99
 100   // Verify that the client goes into exponential backoff while it is unable to
 101   // reach the sync server.
 102   ExponentialBackoffChecker exponential_backoff_checker(GetClient(0));
 103   ASSERT_TRUE(GetClient(0)->AwaitStatusChange(&exponential_backoff_checker,
 104                                               "Checking exponential backoff"));
 105 }
 106
 107 }  // namespace