sync/syncable/on_disk_directory_backing_store.cc

   1 // Copyright (c) 2012 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 "sync/syncable/on_disk_directory_backing_store.h"
   6
   7 #include "base/logging.h"
   8 #include "base/stl_util.h"
   9 #include "base/metrics/histogram.h"
  10 #include "sync/syncable/syncable-inl.h"
  11
  12 namespace syncer {
  13 namespace syncable {
  14
  15 namespace {
  16
  17 enum HistogramResultEnum {
  18   FIRST_TRY_SUCCESS,
  19   SECOND_TRY_SUCCESS,
  20   SECOND_TRY_FAILURE,
  21   RESULT_COUNT
  22 };
  23
  24 }  // namespace
  25
  26 OnDiskDirectoryBackingStore::OnDiskDirectoryBackingStore(
  27     const std::string& dir_name, const base::FilePath& backing_filepath)
  28     : DirectoryBackingStore(dir_name),
  29       allow_failure_for_test_(false),
  30       backing_filepath_(backing_filepath) {
  31 }
  32
  33 OnDiskDirectoryBackingStore::~OnDiskDirectoryBackingStore() { }
  34
  35 DirOpenResult OnDiskDirectoryBackingStore::TryLoad(
  36     Directory::MetahandlesMap* handles_map,
  37     JournalIndex* delete_journals,
  38     MetahandleSet* metahandles_to_purge,
  39     Directory::KernelLoadInfo* kernel_load_info) {
  40   DCHECK(CalledOnValidThread());
  41   if (!db_->is_open()) {
  42     if (!db_->Open(backing_filepath_))
  43       return FAILED_OPEN_DATABASE;
  44   }
  45
  46   if (!InitializeTables())
  47     return FAILED_OPEN_DATABASE;
  48
  49   if (!LoadEntries(handles_map, metahandles_to_purge))
  50     return FAILED_DATABASE_CORRUPT;
  51   if (!LoadDeleteJournals(delete_journals))
  52     return FAILED_DATABASE_CORRUPT;
  53   if (!LoadInfo(kernel_load_info))
  54     return FAILED_DATABASE_CORRUPT;
  55   if (!VerifyReferenceIntegrity(handles_map))
  56     return FAILED_DATABASE_CORRUPT;
  57
  58   return OPENED;
  59
  60 }
  61
  62 DirOpenResult OnDiskDirectoryBackingStore::Load(
  63     Directory::MetahandlesMap* handles_map,
  64     JournalIndex* delete_journals,
  65     MetahandleSet* metahandles_to_purge,
  66     Directory::KernelLoadInfo* kernel_load_info) {
  67   DirOpenResult result = TryLoad(handles_map, delete_journals,
  68                                  metahandles_to_purge, kernel_load_info);
  69   if (result == OPENED) {
  70     UMA_HISTOGRAM_ENUMERATION(
  71         "Sync.DirectoryOpenResult", FIRST_TRY_SUCCESS, RESULT_COUNT);
  72     return OPENED;
  73   }
  74
  75   ReportFirstTryOpenFailure();
  76
  77   // The fallback: delete the current database and return a fresh one.  We can
  78   // fetch the user's data from the cloud.
  79   STLDeleteValues(handles_map);
  80   STLDeleteElements(delete_journals);
  81
  82   ResetAndCreateConnection();
  83
  84   base::DeleteFile(backing_filepath_, false);
  85
  86   result = TryLoad(handles_map, delete_journals, metahandles_to_purge,
  87                    kernel_load_info);
  88   if (result == OPENED) {
  89     UMA_HISTOGRAM_ENUMERATION(
  90         "Sync.DirectoryOpenResult", SECOND_TRY_SUCCESS, RESULT_COUNT);
  91   } else {
  92     UMA_HISTOGRAM_ENUMERATION(
  93         "Sync.DirectoryOpenResult", SECOND_TRY_FAILURE, RESULT_COUNT);
  94   }
  95
  96   return result;
  97 }
  98
  99 void OnDiskDirectoryBackingStore::ReportFirstTryOpenFailure() {
 100   // In debug builds, the last thing we want is to silently clear the database.
 101   // It's full of evidence that might help us determine what went wrong.  It
 102   // might be sqlite's fault, but it could also be a bug in sync.  We crash
 103   // immediately so a developer can investigate.
 104   //
 105   // Developers: If you're not interested in debugging this right now, just move
 106   // aside the 'Sync Data' directory in your profile.  This is similar to what
 107   // the code would do if this DCHECK were disabled.
 108   NOTREACHED() << "Crashing to preserve corrupt sync database";
 109 }
 110
 111 }  // namespace syncable
 112 }  // namespace syncer