xref: /external/chromium_org/chrome/browser/notifications/sync_notifier/chrome_notifier_service.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// The ChromeNotifierService works together with sync to maintain the state of
// user notifications, which can then be presented in the notification center,
// via the Notification UI Manager.

#include "chrome/browser/notifications/sync_notifier/chrome_notifier_service.h"

#include "chrome/browser/notifications/notification.h"
#include "chrome/browser/notifications/notification_ui_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "googleurl/src/gurl.h"
#include "sync/api/sync_change.h"
#include "sync/api/sync_change_processor.h"
#include "sync/api/sync_error_factory.h"
#include "sync/protocol/sync.pb.h"
#include "sync/protocol/synced_notification_specifics.pb.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebTextDirection.h"

namespace notifier {

bool ChromeNotifierService::avoid_bitmap_fetching_for_test_ = false;

ChromeNotifierService::ChromeNotifierService(Profile* profile,
                                             NotificationUIManager* manager)
    : profile_(profile), notification_manager_(manager) {}
ChromeNotifierService::~ChromeNotifierService() {}

// Methods from BrowserContextKeyedService.
void ChromeNotifierService::Shutdown() {}

// syncer::SyncableService implementation.

// This is called at startup to sync with the server.
// This code is not thread safe.
syncer::SyncMergeResult ChromeNotifierService::MergeDataAndStartSyncing(
      syncer::ModelType type,
      const syncer::SyncDataList& initial_sync_data,
      scoped_ptr<syncer::SyncChangeProcessor> sync_processor,
      scoped_ptr<syncer::SyncErrorFactory> error_handler) {
  // TODO(petewil): After I add the infrastructure for the test, add a check
  // that we are currently on the UI thread here.
  DCHECK_EQ(syncer::SYNCED_NOTIFICATIONS, type);
  syncer::SyncMergeResult merge_result(syncer::SYNCED_NOTIFICATIONS);
  // A list of local changes to send up to the sync server.
  syncer::SyncChangeList new_changes;
  sync_processor_ = sync_processor.Pass();

  for (syncer::SyncDataList::const_iterator it = initial_sync_data.begin();
       it != initial_sync_data.end(); ++it) {
    const syncer::SyncData& sync_data = *it;
    DCHECK_EQ(syncer::SYNCED_NOTIFICATIONS, sync_data.GetDataType());

    // Build a local notification object from the sync data.
    scoped_ptr<SyncedNotification> incoming(CreateNotificationFromSyncData(
        sync_data));
    if (!incoming) {
      // TODO(petewil): Turn this into a NOTREACHED() call once we fix the
      // underlying problem causing bad data.
      LOG(WARNING) << "Badly formed sync data in incoming notification";
      continue;
    }

    // Process each incoming remote notification.
    const std::string& key = incoming->GetKey();
    DCHECK_GT(key.length(), 0U);
    SyncedNotification* found = FindNotificationByKey(key);

    if (NULL == found) {
      // If there are no conflicts, copy in the data from remote.
      Add(incoming.Pass());
    } else {
      // If the incoming (remote) and stored (local) notifications match
      // in all fields, we don't need to do anything here.
      if (incoming->EqualsIgnoringReadState(*found)) {

        if (incoming->GetReadState() == found->GetReadState()) {
          // Notification matches on the client and the server, nothing to do.
          continue;
        } else  {
          // If the read state is different, read wins for both places.
          if (incoming->GetReadState() == SyncedNotification::kDismissed) {
            // If it is marked as read on the server, but not the client.
            found->NotificationHasBeenDismissed();
            // TODO(petewil): Tell the Notification UI Manager to mark it read.
          } else {
            // If it is marked as read on the client, but not the server.
            syncer::SyncData sync_data = CreateSyncDataFromNotification(*found);
            new_changes.push_back(
                syncer::SyncChange(FROM_HERE,
                                   syncer::SyncChange::ACTION_UPDATE,
                                   sync_data));
          }
          // If local state changed, notify Notification UI Manager.
        }
      // For any other conflict besides read state, treat it as an update.
      } else {
        // If different, just replace the local with the remote.
        // TODO(petewil): Someday we may allow changes from the client to
        // flow upwards, when we do, we will need better merge resolution.
        found->Update(sync_data);
      }
    }
  }

  // Send up the changes that were made locally.
  if (new_changes.size() > 0) {
    merge_result.set_error(sync_processor_->ProcessSyncChanges(
        FROM_HERE, new_changes));
  }

  return merge_result;
}

void ChromeNotifierService::StopSyncing(syncer::ModelType type) {
  DCHECK_EQ(syncer::SYNCED_NOTIFICATIONS, type);
  // TODO(petewil): implement
}

syncer::SyncDataList ChromeNotifierService::GetAllSyncData(
      syncer::ModelType type) const {
  DCHECK_EQ(syncer::SYNCED_NOTIFICATIONS, type);
  syncer::SyncDataList sync_data;

  // Copy our native format data into a SyncDataList format.
  for (std::vector<SyncedNotification*>::const_iterator it =
          notification_data_.begin();
      it != notification_data_.end();
      ++it) {
    sync_data.push_back(CreateSyncDataFromNotification(**it));
  }

  return sync_data;
}

// This method is called when there is an incoming sync change from the server.
syncer::SyncError ChromeNotifierService::ProcessSyncChanges(
      const tracked_objects::Location& from_here,
      const syncer::SyncChangeList& change_list) {
  // TODO(petewil): add a check that we are called on the thread we expect.
  syncer::SyncError error;

  for (syncer::SyncChangeList::const_iterator it = change_list.begin();
       it != change_list.end(); ++it) {
    syncer::SyncData sync_data = it->sync_data();
    DCHECK_EQ(syncer::SYNCED_NOTIFICATIONS, sync_data.GetDataType());
    syncer::SyncChange::SyncChangeType change_type = it->change_type();

    scoped_ptr<SyncedNotification> new_notification(
        CreateNotificationFromSyncData(sync_data));
    if (!new_notification.get()) {
      NOTREACHED() << "Failed to read notification.";
      continue;
    }

    switch (change_type) {
      case syncer::SyncChange::ACTION_ADD:
        // TODO(petewil): Update the notification if it already exists
        // as opposed to adding it.
        Add(new_notification.Pass());
        break;
      // TODO(petewil): Implement code to add delete and update actions.

      default:
        break;
    }
  }

  return error;
}

// Support functions for data type conversion.

// Static method.  Get to the sync data in our internal format.
syncer::SyncData ChromeNotifierService::CreateSyncDataFromNotification(
    const SyncedNotification& notification) {
  // Construct the sync_data using the specifics from the notification.
  return syncer::SyncData::CreateLocalData(
      notification.GetKey(), notification.GetKey(),
      notification.GetEntitySpecifics());
}

// Static Method.  Convert from SyncData to our internal format.
scoped_ptr<SyncedNotification>
    ChromeNotifierService::CreateNotificationFromSyncData(
        const syncer::SyncData& sync_data) {
  // Get a pointer to our data within the sync_data object.
  sync_pb::SyncedNotificationSpecifics specifics =
      sync_data.GetSpecifics().synced_notification();

  // Check for mandatory fields in the sync_data object.
  if (!specifics.has_coalesced_notification() ||
      !specifics.coalesced_notification().has_key() ||
      !specifics.coalesced_notification().has_read_state()) {
    DVLOG(1) << "Synced Notification missing mandatory fields "
             << "has coalesced notification? "
             << specifics.has_coalesced_notification()
             << " has key? " << specifics.coalesced_notification().has_key()
             << " has read state? "
             << specifics.coalesced_notification().has_read_state();
    return scoped_ptr<SyncedNotification>();
  }

  // TODO(petewil): Is this the right set?  Should I add more?
  bool is_well_formed_unread_notification =
      (static_cast<SyncedNotification::ReadState>(
          specifics.coalesced_notification().read_state()) ==
       SyncedNotification::kUnread &&
       specifics.coalesced_notification().has_render_info());
  bool is_well_formed_dismissed_notification =
      (static_cast<SyncedNotification::ReadState>(
          specifics.coalesced_notification().read_state()) ==
       SyncedNotification::kDismissed);

  // if the notification is poorly formed, return a null pointer
  if (!is_well_formed_unread_notification &&
      !is_well_formed_dismissed_notification) {
    DVLOG(1) << "Synced Notification is not well formed."
             << " unread well formed? "
             << is_well_formed_unread_notification
             << " dismissed well formed? "
             << is_well_formed_dismissed_notification;
    return scoped_ptr<SyncedNotification>();
  }

  // Create a new notification object based on the supplied sync_data.
  scoped_ptr<SyncedNotification> notification(
      new SyncedNotification(sync_data));

  return notification.Pass();
}

// This returns a pointer into a vector that we own.  Caller must not free it.
// Returns NULL if no match is found.
SyncedNotification* ChromeNotifierService::FindNotificationByKey(
    const std::string& key) {
  // TODO(petewil): We can make a performance trade off here.
  // While the vector has good locality of reference, a map has faster lookup.
  // Based on how big we expect this to get, maybe change this to a map.
  for (std::vector<SyncedNotification*>::const_iterator it =
          notification_data_.begin();
      it != notification_data_.end();
      ++it) {
    SyncedNotification* notification = *it;
    if (key == notification->GetKey())
      return *it;
  }

  return NULL;
}

void ChromeNotifierService::MarkNotificationAsDismissed(
    const std::string& key) {
  SyncedNotification* notification = FindNotificationByKey(key);
  CHECK(notification != NULL);

  notification->NotificationHasBeenDismissed();
  syncer::SyncChangeList new_changes;

  syncer::SyncData sync_data = CreateSyncDataFromNotification(*notification);
  new_changes.push_back(
      syncer::SyncChange(FROM_HERE,
                         syncer::SyncChange::ACTION_UPDATE,
                         sync_data));

  // Send up the changes that were made locally.
  sync_processor_->ProcessSyncChanges(FROM_HERE, new_changes);
}

// Add a new notification to our data structure.  This takes ownership
// of the passed in pointer.
void ChromeNotifierService::Add(scoped_ptr<SyncedNotification> notification) {
  SyncedNotification* notification_copy = notification.get();
  // Take ownership of the object and put it into our local storage.
  notification_data_.push_back(notification.release());

  // Set up to fetch the bitmaps.
  notification_copy->QueueBitmapFetchJobs(notification_manager_,
                                          this,
                                          profile_);

  // Our tests cannot use the network for reliability reasons.
  if (avoid_bitmap_fetching_for_test_) {
    return;
  }

  // Start the bitmap fetching, Show() will be called when the last bitmap
  // either arrives or times out.
  notification_copy->StartBitmapFetch();
}

}  // namespace notifier