| /* |
| * Copyright 2014 Google Inc. All rights reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.android.apps.iosched.gcm.server.device; |
| |
| import com.google.android.apps.iosched.gcm.server.db.ApiKeyInitializer; |
| import com.google.android.apps.iosched.gcm.server.db.MessageStore; |
| import com.google.android.apps.iosched.gcm.server.db.DeviceStore; |
| import com.google.android.apps.iosched.gcm.server.db.models.Device; |
| import com.google.android.apps.iosched.gcm.server.db.models.MulticastMessage; |
| import com.google.android.gcm.server.*; |
| import com.google.appengine.api.taskqueue.Queue; |
| import com.google.appengine.api.taskqueue.QueueFactory; |
| import com.google.appengine.api.taskqueue.TaskOptions; |
| |
| import javax.servlet.ServletConfig; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.TimeUnit; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** Utility class for sending individual messages to devices. |
| * |
| * This class is responsible for communication with the GCM server for purposes of sending |
| * messages. |
| * |
| * @return true if success, false if |
| */ |
| public class MessageSender { |
| private String mApiKey; |
| private Sender mGcmService; |
| |
| private static final int TTL = (int) TimeUnit.MINUTES.toSeconds(300); |
| protected final Logger mLogger = Logger.getLogger(getClass().getName()); |
| /** Maximum devices in a multicast message */ |
| private static final int MAX_DEVICES = 1000; |
| |
| public MessageSender(ServletConfig config) { |
| mApiKey = (String) config.getServletContext().getAttribute( |
| ApiKeyInitializer.ATTRIBUTE_ACCESS_KEY); |
| mGcmService = new Sender(mApiKey); |
| } |
| |
| public void multicastSend(List<Device> devices, String action, String extraData) { |
| Queue queue = QueueFactory.getQueue("MulticastMessagesQueue"); |
| |
| // Split messages into batches for multicast |
| // GCM limits maximum devices per multicast request. AppEngine also limits the size of |
| // lists stored in the datastore. |
| int total = devices.size(); |
| List<String> partialDevices = new ArrayList<String>(total); |
| int counter = 0; |
| for (Device device : devices) { |
| counter ++; |
| partialDevices.add(device.getGcmId()); |
| int partialSize = partialDevices.size(); |
| if (partialSize == MAX_DEVICES || counter == total) { |
| // Send multicast message |
| Long multicastKey = MessageStore.createMulticast(partialDevices, |
| action, |
| extraData); |
| mLogger.fine("Queuing " + partialSize + " devices on multicast " + multicastKey); |
| TaskOptions taskOptions = TaskOptions.Builder |
| .withUrl("/queue/send") |
| .param("multicastKey", Long.toString(multicastKey)) |
| .method(TaskOptions.Method.POST); |
| queue.add(taskOptions); |
| partialDevices.clear(); |
| } |
| } |
| mLogger.fine("Queued message to " + total + " devices"); |
| } |
| |
| boolean sendMessage(Long multicastId) { |
| MulticastMessage msg = MessageStore.getMulticast(multicastId); |
| List<String> devices = msg.getDestinations(); |
| String action = msg.getAction(); |
| Message.Builder builder = new Message.Builder().delayWhileIdle(true); |
| if (action == null || action.length() == 0) { |
| throw new IllegalArgumentException("Message action cannot be empty."); |
| } |
| builder.collapseKey(action) |
| .addData("action", action) |
| .addData("extraData", msg.getExtraData()) |
| .timeToLive(TTL); |
| Message message = builder.build(); |
| MulticastResult multicastResult = null; |
| try { |
| // TODO: We occasionally see null messages. (Maybe due to squelch?) |
| // We should these from entering the send queue in the first place. In the meantime, |
| // here's a hack to prevent this. |
| if (devices != null) { |
| multicastResult = mGcmService.sendNoRetry(message, devices); |
| mLogger.info("Result: " + multicastResult); |
| } else { |
| mLogger.info("Null device list detected. Aborting."); |
| return true; |
| } |
| } catch (IOException e) { |
| mLogger.log(Level.SEVERE, "Exception posting " + message, e); |
| return true; |
| } |
| boolean allDone = true; |
| // check if any registration id must be updated |
| if (multicastResult.getCanonicalIds() != 0) { |
| List<Result> results = multicastResult.getResults(); |
| for (int i = 0; i < results.size(); i++) { |
| String canonicalRegId = results.get(i).getCanonicalRegistrationId(); |
| if (canonicalRegId != null) { |
| String regId = devices.get(i); |
| DeviceStore.updateRegistration(regId, canonicalRegId); |
| } |
| } |
| } |
| if (multicastResult.getFailure() != 0) { |
| // there were failures, check if any could be retried |
| List<Result> results = multicastResult.getResults(); |
| List<String> retriableRegIds = new ArrayList<String>(); |
| for (int i = 0; i < results.size(); i++) { |
| String error = results.get(i).getErrorCodeName(); |
| if (error != null) { |
| String regId = devices.get(i); |
| mLogger.warning("Got error (" + error + ") for regId " + regId); |
| if (error.equals(Constants.ERROR_NOT_REGISTERED)) { |
| // application has been removed from device - unregister it |
| DeviceStore.unregister(regId); |
| } |
| if (error.equals(Constants.ERROR_UNAVAILABLE)) { |
| retriableRegIds.add(regId); |
| } |
| } |
| } |
| if (!retriableRegIds.isEmpty()) { |
| // update task |
| MessageStore.updateMulticast(multicastId, retriableRegIds); |
| allDone = false; |
| return false; |
| } |
| } |
| if (allDone) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| } |