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,
  28     const base::FilePath& backing_file_path)
  29     : DirectoryBackingStore(dir_name),
  30       allow_failure_for_test_(false),
  31       backing_file_path_(backing_file_path) {
  32 }
  33
  34 OnDiskDirectoryBackingStore::~OnDiskDirectoryBackingStore() {
  35 }
  36
  37 DirOpenResult OnDiskDirectoryBackingStore::TryLoad(
  38     Directory::MetahandlesMap* handles_map,
  39     JournalIndex* delete_journals,
  40     MetahandleSet* metahandles_to_purge,
  41     Directory::KernelLoadInfo* kernel_load_info) {
  42   DCHECK(CalledOnValidThread());
  43
  44   if (!IsOpen()) {
  45     if (!Open(backing_file_path_))
  46       return FAILED_OPEN_DATABASE;
  47   }
  48
  49   if (!InitializeTables())
  50     return FAILED_OPEN_DATABASE;
  51
  52   if (!LoadEntries(handles_map, metahandles_to_purge))
  53     return FAILED_DATABASE_CORRUPT;
  54   if (!LoadDeleteJournals(delete_journals))
  55     return FAILED_DATABASE_CORRUPT;
  56   if (!LoadInfo(kernel_load_info))
  57     return FAILED_DATABASE_CORRUPT;
  58   if (!VerifyReferenceIntegrity(handles_map))
  59     return FAILED_DATABASE_CORRUPT;
  60
  61   return OPENED;
  62 }
  63
  64 DirOpenResult OnDiskDirectoryBackingStore::Load(
  65     Directory::MetahandlesMap* handles_map,
  66     JournalIndex* delete_journals,
  67     MetahandleSet* metahandles_to_purge,
  68     Directory::KernelLoadInfo* kernel_load_info) {
  69   DCHECK(CalledOnValidThread());
  70   DirOpenResult result = TryLoad(handles_map, delete_journals,
  71                                  metahandles_to_purge, kernel_load_info);
  72   if (result == OPENED) {
  73     UMA_HISTOGRAM_ENUMERATION("Sync.DirectoryOpenResult", FIRST_TRY_SUCCESS,
  74                               RESULT_COUNT);
  75     return OPENED;
  76   }
  77
  78   ReportFirstTryOpenFailure();
  79
  80   // The fallback: delete the current database and return a fresh one.  We can
  81   // fetch the user's data from the cloud.
  82   STLDeleteValues(handles_map);
  83   STLDeleteElements(delete_journals);
  84
  85   ResetAndCreateConnection();
  86
  87   base::DeleteFile(backing_file_path_, false);
  88
  89   result = TryLoad(handles_map, delete_journals, metahandles_to_purge,
  90                    kernel_load_info);
  91   if (result == OPENED) {
  92     UMA_HISTOGRAM_ENUMERATION("Sync.DirectoryOpenResult", SECOND_TRY_SUCCESS,
  93                               RESULT_COUNT);
  94   } else {
  95     UMA_HISTOGRAM_ENUMERATION("Sync.DirectoryOpenResult", SECOND_TRY_FAILURE,
  96                               RESULT_COUNT);
  97   }
  98
  99   return result;
 100 }
 101
 102 void OnDiskDirectoryBackingStore::ReportFirstTryOpenFailure() {
 103   // In debug builds, the last thing we want is to silently clear the database.
 104   // It's full of evidence that might help us determine what went wrong.  It
 105   // might be sqlite's fault, but it could also be a bug in sync.  We crash
 106   // immediately so a developer can investigate.
 107   //
 108   // Developers: If you're not interested in debugging this right now, just move
 109   // aside the 'Sync Data' directory in your profile.  This is similar to what
 110   // the code would do if this DCHECK were disabled.
 111   NOTREACHED() << "Crashing to preserve corrupt sync database";
 112 }
 113
 114 const base::FilePath& OnDiskDirectoryBackingStore::backing_file_path() const {
 115   DCHECK(CalledOnValidThread());
 116   return backing_file_path_;
 117 }
 118
 119 }  // namespace syncable
 120 }  // namespace syncer