chrome/browser/extensions/api/storage/settings_sync_processor.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 "chrome/browser/extensions/api/storage/settings_sync_processor.h"
   6 #include "chrome/browser/extensions/api/storage/settings_sync_util.h"
   7 #include "content/public/browser/browser_thread.h"
   8 #include "extensions/browser/api/storage/settings_namespace.h"
   9 #include "sync/api/sync_change_processor.h"
  10 #include "sync/api/sync_data.h"
  11 #include "sync/protocol/extension_setting_specifics.pb.h"
  12
  13 using content::BrowserThread;
  14
  15 namespace extensions {
  16
  17 SettingsSyncProcessor::SettingsSyncProcessor(
  18     const std::string& extension_id,
  19     syncer::ModelType type,
  20     syncer::SyncChangeProcessor* sync_processor)
  21     : extension_id_(extension_id),
  22       type_(type),
  23       sync_processor_(sync_processor),
  24       initialized_(false) {
  25   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
  26   CHECK(type == syncer::EXTENSION_SETTINGS || type == syncer::APP_SETTINGS);
  27   CHECK(sync_processor);
  28 }
  29
  30 SettingsSyncProcessor::~SettingsSyncProcessor() {
  31   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
  32 }
  33
  34 void SettingsSyncProcessor::Init(const base::DictionaryValue& initial_state) {
  35   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
  36   CHECK(!initialized_) << "Init called multiple times";
  37
  38   for (base::DictionaryValue::Iterator i(initial_state); !i.IsAtEnd();
  39        i.Advance())
  40     synced_keys_.insert(i.key());
  41
  42   initialized_ = true;
  43 }
  44
  45 syncer::SyncError SettingsSyncProcessor::SendChanges(
  46     const ValueStoreChangeList& changes) {
  47   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
  48   CHECK(initialized_) << "Init not called";
  49
  50   syncer::SyncChangeList sync_changes;
  51   std::set<std::string> added_keys;
  52   std::set<std::string> deleted_keys;
  53
  54   for (ValueStoreChangeList::const_iterator i = changes.begin();
  55       i != changes.end(); ++i) {
  56     const std::string& key = i->key();
  57     const base::Value* value = i->new_value();
  58     if (value) {
  59       if (synced_keys_.count(key)) {
  60         // New value, key is synced; send ACTION_UPDATE.
  61         sync_changes.push_back(settings_sync_util::CreateUpdate(
  62             extension_id_, key, *value, type_));
  63       } else {
  64         // New value, key is not synced; send ACTION_ADD.
  65         sync_changes.push_back(settings_sync_util::CreateAdd(
  66             extension_id_, key, *value, type_));
  67         added_keys.insert(key);
  68       }
  69     } else {
  70       if (synced_keys_.count(key)) {
  71         // Clearing value, key is synced; send ACTION_DELETE.
  72         sync_changes.push_back(settings_sync_util::CreateDelete(
  73             extension_id_, key, type_));
  74         deleted_keys.insert(key);
  75       } else {
  76         LOG(WARNING) << "Deleted " << key << " but not in synced_keys_";
  77       }
  78     }
  79   }
  80
  81   if (sync_changes.empty())
  82     return syncer::SyncError();
  83
  84   syncer::SyncError error =
  85       sync_processor_->ProcessSyncChanges(FROM_HERE, sync_changes);
  86   if (error.IsSet())
  87     return error;
  88
  89   synced_keys_.insert(added_keys.begin(), added_keys.end());
  90   for (std::set<std::string>::iterator i = deleted_keys.begin();
  91       i != deleted_keys.end(); ++i) {
  92     synced_keys_.erase(*i);
  93   }
  94
  95   return syncer::SyncError();
  96 }
  97
  98 void SettingsSyncProcessor::NotifyChanges(const ValueStoreChangeList& changes) {
  99   DCHECK_CURRENTLY_ON(BrowserThread::FILE);
 100   CHECK(initialized_) << "Init not called";
 101
 102   for (ValueStoreChangeList::const_iterator i = changes.begin();
 103       i != changes.end(); ++i) {
 104     if (i->new_value())
 105       synced_keys_.insert(i->key());
 106     else
 107       synced_keys_.erase(i->key());
 108   }
 109 }
 110
 111 }  // namespace extensions