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