1144 lines
52 KiB
Java
1144 lines
52 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.service;
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import android.accounts.AccountManager;
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import android.app.AlarmManager;
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import android.app.PendingIntent;
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import android.app.Service;
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import android.content.BroadcastReceiver;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.Intent;
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import android.database.Cursor;
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import android.net.ConnectivityManager;
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import android.net.Uri;
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import android.os.AsyncTask;
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import android.os.IBinder;
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import android.os.RemoteException;
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import android.os.SystemClock;
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import android.text.format.DateUtils;
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import com.android.email.AttachmentInfo;
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import com.android.email.EmailConnectivityManager;
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import com.android.email.NotificationController;
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import com.android.emailcommon.provider.Account;
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import com.android.emailcommon.provider.EmailContent;
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import com.android.emailcommon.provider.EmailContent.Attachment;
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import com.android.emailcommon.provider.EmailContent.AttachmentColumns;
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import com.android.emailcommon.provider.EmailContent.Message;
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import com.android.emailcommon.service.EmailServiceProxy;
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import com.android.emailcommon.service.EmailServiceStatus;
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import com.android.emailcommon.service.IEmailServiceCallback;
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import com.android.emailcommon.utility.AttachmentUtilities;
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import com.android.emailcommon.utility.Utility;
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import com.android.mail.providers.UIProvider.AttachmentState;
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import com.android.mail.utils.LogUtils;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.PrintWriter;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Queue;
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import java.util.TreeSet;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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public class AttachmentDownloadService extends Service implements Runnable {
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public static final String TAG = LogUtils.TAG;
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// Minimum wait time before retrying a download that failed due to connection error
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private static final long CONNECTION_ERROR_RETRY_MILLIS = 10 * DateUtils.SECOND_IN_MILLIS;
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// Number of retries before we start delaying between
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private static final long CONNECTION_ERROR_DELAY_THRESHOLD = 5;
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// Maximum time to retry for connection errors.
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private static final long CONNECTION_ERROR_MAX_RETRIES = 10;
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// Our idle time, waiting for notifications; this is something of a failsafe
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private static final int PROCESS_QUEUE_WAIT_TIME = 30 * ((int)DateUtils.MINUTE_IN_MILLIS);
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// How often our watchdog checks for callback timeouts
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private static final int WATCHDOG_CHECK_INTERVAL = 20 * ((int)DateUtils.SECOND_IN_MILLIS);
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// How long we'll wait for a callback before canceling a download and retrying
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private static final int CALLBACK_TIMEOUT = 30 * ((int)DateUtils.SECOND_IN_MILLIS);
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// Try to download an attachment in the background this many times before giving up
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private static final int MAX_DOWNLOAD_RETRIES = 5;
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private static final int PRIORITY_NONE = -1;
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@SuppressWarnings("unused")
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// Low priority will be used for opportunistic downloads
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private static final int PRIORITY_BACKGROUND = 0;
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// Normal priority is for forwarded downloads in outgoing mail
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private static final int PRIORITY_SEND_MAIL = 1;
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// High priority is for user requests
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private static final int PRIORITY_FOREGROUND = 2;
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// Minimum free storage in order to perform prefetch (25% of total memory)
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private static final float PREFETCH_MINIMUM_STORAGE_AVAILABLE = 0.25F;
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// Maximum prefetch storage (also 25% of total memory)
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private static final float PREFETCH_MAXIMUM_ATTACHMENT_STORAGE = 0.25F;
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// We can try various values here; I think 2 is completely reasonable as a first pass
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private static final int MAX_SIMULTANEOUS_DOWNLOADS = 2;
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// Limit on the number of simultaneous downloads per account
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// Note that a limit of 1 is currently enforced by both Services (MailService and Controller)
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private static final int MAX_SIMULTANEOUS_DOWNLOADS_PER_ACCOUNT = 1;
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// Limit on the number of attachments we'll check for background download
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private static final int MAX_ATTACHMENTS_TO_CHECK = 25;
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private static final String EXTRA_ATTACHMENT =
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"com.android.email.AttachmentDownloadService.attachment";
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// sRunningService is only set in the UI thread; it's visibility elsewhere is guaranteed
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// by the use of "volatile"
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/*package*/ static volatile AttachmentDownloadService sRunningService = null;
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/*package*/ Context mContext;
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/*package*/ EmailConnectivityManager mConnectivityManager;
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/*package*/ final DownloadSet mDownloadSet = new DownloadSet(new DownloadComparator());
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private final HashMap<Long, Intent> mAccountServiceMap = new HashMap<Long, Intent>();
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// A map of attachment storage used per account
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// NOTE: This map is not kept current in terms of deletions (i.e. it stores the last calculated
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// amount plus the size of any new attachments laoded). If and when we reach the per-account
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// limit, we recalculate the actual usage
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/*package*/ final HashMap<Long, Long> mAttachmentStorageMap = new HashMap<Long, Long>();
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// A map of attachment ids to the number of failed attempts to download the attachment
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// NOTE: We do not want to persist this. This allows us to retry background downloading
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// if any transient network errors are fixed & and the app is restarted
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/* package */ final HashMap<Long, Integer> mAttachmentFailureMap = new HashMap<Long, Integer>();
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private final ServiceCallback mServiceCallback = new ServiceCallback();
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private final Object mLock = new Object();
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private volatile boolean mStop = false;
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/*package*/ AccountManagerStub mAccountManagerStub;
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/**
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* We only use the getAccounts() call from AccountManager, so this class wraps that call and
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* allows us to build a mock account manager stub in the unit tests
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*/
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/*package*/ static class AccountManagerStub {
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private int mNumberOfAccounts;
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private final AccountManager mAccountManager;
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AccountManagerStub(Context context) {
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if (context != null) {
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mAccountManager = AccountManager.get(context);
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} else {
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mAccountManager = null;
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}
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}
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/*package*/ int getNumberOfAccounts() {
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if (mAccountManager != null) {
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return mAccountManager.getAccounts().length;
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} else {
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return mNumberOfAccounts;
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}
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}
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/*package*/ void setNumberOfAccounts(int numberOfAccounts) {
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mNumberOfAccounts = numberOfAccounts;
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}
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}
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/**
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* Watchdog alarm receiver; responsible for making sure that downloads in progress are not
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* stalled, as determined by the timing of the most recent service callback
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*/
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public static class Watchdog extends BroadcastReceiver {
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@Override
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public void onReceive(final Context context, Intent intent) {
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new Thread(new Runnable() {
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@Override
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public void run() {
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watchdogAlarm();
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}
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}, "AttachmentDownloadService Watchdog").start();
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}
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}
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public static class DownloadRequest {
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final int priority;
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final long time;
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final long attachmentId;
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final long messageId;
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final long accountId;
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boolean inProgress = false;
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int lastStatusCode;
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int lastProgress;
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long lastCallbackTime;
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long startTime;
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long retryCount;
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long retryStartTime;
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private DownloadRequest(Context context, Attachment attachment) {
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attachmentId = attachment.mId;
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Message msg = Message.restoreMessageWithId(context, attachment.mMessageKey);
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if (msg != null) {
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accountId = msg.mAccountKey;
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messageId = msg.mId;
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} else {
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accountId = messageId = -1;
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}
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priority = getPriority(attachment);
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time = SystemClock.elapsedRealtime();
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}
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private DownloadRequest(DownloadRequest orig, long newTime) {
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priority = orig.priority;
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attachmentId = orig.attachmentId;
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messageId = orig.messageId;
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accountId = orig.accountId;
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time = newTime;
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inProgress = orig.inProgress;
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lastStatusCode = orig.lastStatusCode;
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lastProgress = orig.lastProgress;
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lastCallbackTime = orig.lastCallbackTime;
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startTime = orig.startTime;
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retryCount = orig.retryCount;
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retryStartTime = orig.retryStartTime;
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}
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@Override
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public int hashCode() {
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return (int)attachmentId;
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}
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/**
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* Two download requests are equals if their attachment id's are equals
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*/
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@Override
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public boolean equals(Object object) {
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if (!(object instanceof DownloadRequest)) return false;
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DownloadRequest req = (DownloadRequest)object;
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return req.attachmentId == attachmentId;
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}
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}
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/**
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* Comparator class for the download set; we first compare by priority. Requests with equal
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* priority are compared by the time the request was created (older requests come first)
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*/
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/*protected*/ static class DownloadComparator implements Comparator<DownloadRequest> {
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@Override
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public int compare(DownloadRequest req1, DownloadRequest req2) {
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int res;
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if (req1.priority != req2.priority) {
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res = (req1.priority < req2.priority) ? -1 : 1;
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} else {
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if (req1.time == req2.time) {
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res = 0;
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} else {
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res = (req1.time > req2.time) ? -1 : 1;
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}
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}
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return res;
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}
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}
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/**
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* The DownloadSet is a TreeSet sorted by priority class (e.g. low, high, etc.) and the
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* time of the request. Higher priority requests
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* are always processed first; among equals, the oldest request is processed first. The
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* priority key represents this ordering. Note: All methods that change the attachment map are
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* synchronized on the map itself
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*/
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/*package*/ class DownloadSet extends TreeSet<DownloadRequest> {
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private static final long serialVersionUID = 1L;
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private PendingIntent mWatchdogPendingIntent;
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/*package*/ DownloadSet(Comparator<? super DownloadRequest> comparator) {
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super(comparator);
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}
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/**
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* Maps attachment id to DownloadRequest
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*/
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/*package*/ final ConcurrentHashMap<Long, DownloadRequest> mDownloadsInProgress =
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new ConcurrentHashMap<Long, DownloadRequest>();
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private void markAttachmentAsFailed(final Attachment att) {
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final ContentValues cv = new ContentValues();
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final int flags = Attachment.FLAG_DOWNLOAD_FORWARD | Attachment.FLAG_DOWNLOAD_USER_REQUEST;
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cv.put(AttachmentColumns.FLAGS, att.mFlags &= ~flags);
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cv.put(AttachmentColumns.UI_STATE, AttachmentState.FAILED);
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att.update(mContext, cv);
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}
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/**
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* onChange is called by the AttachmentReceiver upon receipt of a valid notification from
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* EmailProvider that an attachment has been inserted or modified. It's not strictly
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* necessary that we detect a deleted attachment, as the code always checks for the
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* existence of an attachment before acting on it.
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*/
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public synchronized void onChange(Context context, Attachment att) {
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DownloadRequest req = findDownloadRequest(att.mId);
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long priority = getPriority(att);
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if (priority == PRIORITY_NONE) {
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if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
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LogUtils.d(TAG, "== Attachment changed: " + att.mId);
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}
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// In this case, there is no download priority for this attachment
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if (req != null) {
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// If it exists in the map, remove it
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// NOTE: We don't yet support deleting downloads in progress
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if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
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LogUtils.d(TAG, "== Attachment " + att.mId + " was in queue, removing");
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}
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remove(req);
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}
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} else {
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// Ignore changes that occur during download
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if (mDownloadsInProgress.containsKey(att.mId)) return;
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// If this is new, add the request to the queue
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if (req == null) {
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req = new DownloadRequest(context, att);
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final AttachmentInfo attachInfo = new AttachmentInfo(context, att);
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if (!attachInfo.isEligibleForDownload()) {
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// We can't download this file due to policy, depending on what type
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// of request we received, we handle the response differently.
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if (((att.mFlags & Attachment.FLAG_DOWNLOAD_USER_REQUEST) != 0) ||
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((att.mFlags & Attachment.FLAG_POLICY_DISALLOWS_DOWNLOAD) != 0)) {
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// There are a couple of situations where we will not even allow this
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// request to go in the queue because we can already process it as a
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// failure.
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// 1. The user explictly wants to download this attachment from the
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// email view but they should not be able to...either because there is
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// no app to view it or because its been marked as a policy violation.
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// 2. The user is forwarding an email and the attachment has been
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// marked as a policy violation. If the attachment is non viewable
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// that is OK for forwarding a message so we'll let it pass through
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markAttachmentAsFailed(att);
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return;
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}
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// If we get this far it a forward of an attachment that is only
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// ineligible because we can't view it or process it. Not because we
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// can't download it for policy reasons. Let's let this go through because
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// the final recipient of this forward email might be able to process it.
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}
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add(req);
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}
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// If the request already existed, we'll update the priority (so that the time is
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// up-to-date); otherwise, we create a new request
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if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
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LogUtils.d(TAG, "== Download queued for attachment " + att.mId + ", class " +
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req.priority + ", priority time " + req.time);
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}
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}
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// Process the queue if we're in a wait
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kick();
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}
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/**
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* Find a queued DownloadRequest, given the attachment's id
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* @param id the id of the attachment
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* @return the DownloadRequest for that attachment (or null, if none)
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*/
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/*package*/ synchronized DownloadRequest findDownloadRequest(long id) {
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Iterator<DownloadRequest> iterator = iterator();
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while(iterator.hasNext()) {
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DownloadRequest req = iterator.next();
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if (req.attachmentId == id) {
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return req;
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}
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}
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return null;
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}
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@Override
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public synchronized boolean isEmpty() {
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return super.isEmpty() && mDownloadsInProgress.isEmpty();
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}
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/**
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* Run through the AttachmentMap and find DownloadRequests that can be executed, enforcing
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* the limit on maximum downloads
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*/
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/*package*/ synchronized void processQueue() {
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if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
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LogUtils.d(TAG, "== Checking attachment queue, " + mDownloadSet.size()
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+ " entries");
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}
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Iterator<DownloadRequest> iterator = mDownloadSet.descendingIterator();
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// First, start up any required downloads, in priority order
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while (iterator.hasNext() &&
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(mDownloadsInProgress.size() < MAX_SIMULTANEOUS_DOWNLOADS)) {
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DownloadRequest req = iterator.next();
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// Enforce per-account limit here
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if (downloadsForAccount(req.accountId) >= MAX_SIMULTANEOUS_DOWNLOADS_PER_ACCOUNT) {
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if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
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LogUtils.d(TAG, "== Skip #" + req.attachmentId + "; maxed for acct #" +
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req.accountId);
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}
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continue;
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} else if (Attachment.restoreAttachmentWithId(mContext, req.attachmentId) == null) {
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continue;
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}
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if (!req.inProgress) {
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final long currentTime = SystemClock.elapsedRealtime();
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if (req.retryCount > 0 && req.retryStartTime > currentTime) {
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LogUtils.d(TAG, "== waiting to retry attachment %d", req.attachmentId);
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setWatchdogAlarm(CONNECTION_ERROR_RETRY_MILLIS);
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continue;
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}
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// TODO: We try to gate ineligible downloads from entering the queue but its
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// always possible that they made it in here regardless in the future. In a
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// perfect world, we would make it bullet proof with a check for eligibility
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// here instead/also.
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mDownloadSet.tryStartDownload(req);
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}
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}
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// Don't prefetch if background downloading is disallowed
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EmailConnectivityManager ecm = mConnectivityManager;
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if (ecm == null) return;
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if (!ecm.isAutoSyncAllowed()) return;
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// Don't prefetch unless we're on a WiFi network
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if (ecm.getActiveNetworkType() != ConnectivityManager.TYPE_WIFI) {
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return;
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}
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// Then, try opportunistic download of appropriate attachments
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int backgroundDownloads = MAX_SIMULTANEOUS_DOWNLOADS - mDownloadsInProgress.size();
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// Always leave one slot for user requested download
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if (backgroundDownloads > (MAX_SIMULTANEOUS_DOWNLOADS - 1)) {
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// We'll load up the newest 25 attachments that aren't loaded or queued
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Uri lookupUri = EmailContent.uriWithLimit(Attachment.CONTENT_URI,
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MAX_ATTACHMENTS_TO_CHECK);
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Cursor c = mContext.getContentResolver().query(lookupUri,
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Attachment.CONTENT_PROJECTION,
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EmailContent.Attachment.PRECACHE_INBOX_SELECTION,
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null, AttachmentColumns._ID + " DESC");
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File cacheDir = mContext.getCacheDir();
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try {
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while (c.moveToNext()) {
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Attachment att = new Attachment();
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att.restore(c);
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Account account = Account.restoreAccountWithId(mContext, att.mAccountKey);
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if (account == null) {
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// Clean up this orphaned attachment; there's no point in keeping it
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// around; then try to find another one
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EmailContent.delete(mContext, Attachment.CONTENT_URI, att.mId);
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} else {
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// Check that the attachment meets system requirements for download
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AttachmentInfo info = new AttachmentInfo(mContext, att);
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if (info.isEligibleForDownload()) {
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// Either the account must be able to prefetch or this must be
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// an inline attachment
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if (att.mContentId != null ||
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(canPrefetchForAccount(account, cacheDir))) {
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Integer tryCount;
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tryCount = mAttachmentFailureMap.get(att.mId);
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if (tryCount != null && tryCount > MAX_DOWNLOAD_RETRIES) {
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// move onto the next attachment
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continue;
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}
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// Start this download and we're done
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DownloadRequest req = new DownloadRequest(mContext, att);
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mDownloadSet.tryStartDownload(req);
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break;
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}
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} else {
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// If this attachment was ineligible for download
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// because of policy related issues, its flags would be set to
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// FLAG_POLICY_DISALLOWS_DOWNLOAD and would not show up in the
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// query results. We are most likely here for other reasons such
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// as the inability to view the attachment. In that case, let's just
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// skip it for now.
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LogUtils.e(TAG, "== skip attachment %d, it is ineligible", att.mId);
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}
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}
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}
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} finally {
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c.close();
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}
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}
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}
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/**
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* Count the number of running downloads in progress for this account
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* @param accountId the id of the account
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* @return the count of running downloads
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*/
|
|
/*package*/ synchronized int downloadsForAccount(long accountId) {
|
|
int count = 0;
|
|
for (DownloadRequest req: mDownloadsInProgress.values()) {
|
|
if (req.accountId == accountId) {
|
|
count++;
|
|
}
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* Watchdog for downloads; we use this in case we are hanging on a download, which might
|
|
* have failed silently (the connection dropped, for example)
|
|
*/
|
|
private void onWatchdogAlarm() {
|
|
// If our service instance is gone, just leave
|
|
if (mStop) {
|
|
return;
|
|
}
|
|
long now = System.currentTimeMillis();
|
|
for (DownloadRequest req: mDownloadsInProgress.values()) {
|
|
// Check how long it's been since receiving a callback
|
|
long timeSinceCallback = now - req.lastCallbackTime;
|
|
if (timeSinceCallback > CALLBACK_TIMEOUT) {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, "== Download of " + req.attachmentId + " timed out");
|
|
}
|
|
cancelDownload(req);
|
|
}
|
|
}
|
|
// Check whether we can start new downloads...
|
|
if (mConnectivityManager != null && mConnectivityManager.hasConnectivity()) {
|
|
processQueue();
|
|
}
|
|
// If there are downloads in progress, reset alarm
|
|
if (!mDownloadsInProgress.isEmpty()) {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, "Reschedule watchdog...");
|
|
}
|
|
setWatchdogAlarm();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attempt to execute the DownloadRequest, enforcing the maximum downloads per account
|
|
* parameter
|
|
* @param req the DownloadRequest
|
|
* @return whether or not the download was started
|
|
*/
|
|
/*package*/ synchronized boolean tryStartDownload(DownloadRequest req) {
|
|
EmailServiceProxy service = EmailServiceUtils.getServiceForAccount(
|
|
AttachmentDownloadService.this, req.accountId);
|
|
|
|
// Do not download the same attachment multiple times
|
|
boolean alreadyInProgress = mDownloadsInProgress.get(req.attachmentId) != null;
|
|
if (alreadyInProgress) return false;
|
|
|
|
try {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, ">> Starting download for attachment #" + req.attachmentId);
|
|
}
|
|
startDownload(service, req);
|
|
} catch (RemoteException e) {
|
|
// TODO: Consider whether we need to do more in this case...
|
|
// For now, fix up our data to reflect the failure
|
|
cancelDownload(req);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private synchronized DownloadRequest getDownloadInProgress(long attachmentId) {
|
|
return mDownloadsInProgress.get(attachmentId);
|
|
}
|
|
|
|
private void setWatchdogAlarm(final long delay) {
|
|
// Lazily initialize the pending intent
|
|
if (mWatchdogPendingIntent == null) {
|
|
Intent intent = new Intent(mContext, Watchdog.class);
|
|
mWatchdogPendingIntent =
|
|
PendingIntent.getBroadcast(mContext, 0, intent, 0);
|
|
}
|
|
// Set the alarm
|
|
AlarmManager am = (AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
|
|
am.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + delay,
|
|
mWatchdogPendingIntent);
|
|
}
|
|
|
|
private void setWatchdogAlarm() {
|
|
setWatchdogAlarm(WATCHDOG_CHECK_INTERVAL);
|
|
}
|
|
|
|
/**
|
|
* Do the work of starting an attachment download using the EmailService interface, and
|
|
* set our watchdog alarm
|
|
*
|
|
* @param service the service handling the download
|
|
* @param req the DownloadRequest
|
|
* @throws RemoteException
|
|
*/
|
|
private void startDownload(EmailServiceProxy service, DownloadRequest req)
|
|
throws RemoteException {
|
|
req.startTime = System.currentTimeMillis();
|
|
req.inProgress = true;
|
|
mDownloadsInProgress.put(req.attachmentId, req);
|
|
service.loadAttachment(mServiceCallback, req.accountId, req.attachmentId,
|
|
req.priority != PRIORITY_FOREGROUND);
|
|
setWatchdogAlarm();
|
|
}
|
|
|
|
private void cancelDownload(DownloadRequest req) {
|
|
LogUtils.d(TAG, "cancelDownload #%d", req.attachmentId);
|
|
req.inProgress = false;
|
|
mDownloadsInProgress.remove(req.attachmentId);
|
|
// Remove the download from our queue, and then decide whether or not to add it back.
|
|
remove(req);
|
|
req.retryCount++;
|
|
if (req.retryCount > CONNECTION_ERROR_MAX_RETRIES) {
|
|
LogUtils.d(TAG, "too many failures, giving up");
|
|
} else {
|
|
LogUtils.d(TAG, "moving to end of queue, will retry");
|
|
// The time field of DownloadRequest is final, because it's unsafe to change it
|
|
// as long as the DownloadRequest is in the DownloadSet. It's needed for the
|
|
// comparator, so changing time would make the request unfindable.
|
|
// Instead, we'll create a new DownloadRequest with an updated time.
|
|
// This will sort at the end of the set.
|
|
req = new DownloadRequest(req, SystemClock.elapsedRealtime());
|
|
add(req);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called when a download is finished; we get notified of this via our EmailServiceCallback
|
|
* @param attachmentId the id of the attachment whose download is finished
|
|
* @param statusCode the EmailServiceStatus code returned by the Service
|
|
*/
|
|
/*package*/ synchronized void endDownload(long attachmentId, int statusCode) {
|
|
// Say we're no longer downloading this
|
|
mDownloadsInProgress.remove(attachmentId);
|
|
|
|
// TODO: This code is conservative and treats connection issues as failures.
|
|
// Since we have no mechanism to throttle reconnection attempts, it makes
|
|
// sense to be cautious here. Once logic is in place to prevent connecting
|
|
// in a tight loop, we can exclude counting connection issues as "failures".
|
|
|
|
// Update the attachment failure list if needed
|
|
Integer downloadCount;
|
|
downloadCount = mAttachmentFailureMap.remove(attachmentId);
|
|
if (statusCode != EmailServiceStatus.SUCCESS) {
|
|
if (downloadCount == null) {
|
|
downloadCount = 0;
|
|
}
|
|
downloadCount += 1;
|
|
mAttachmentFailureMap.put(attachmentId, downloadCount);
|
|
}
|
|
|
|
DownloadRequest req = mDownloadSet.findDownloadRequest(attachmentId);
|
|
if (statusCode == EmailServiceStatus.CONNECTION_ERROR) {
|
|
// If this needs to be retried, just process the queue again
|
|
if (req != null) {
|
|
req.retryCount++;
|
|
if (req.retryCount > CONNECTION_ERROR_MAX_RETRIES) {
|
|
LogUtils.d(TAG, "Connection Error #%d, giving up", attachmentId);
|
|
remove(req);
|
|
} else if (req.retryCount > CONNECTION_ERROR_DELAY_THRESHOLD) {
|
|
// TODO: I'm not sure this is a great retry/backoff policy, but we're
|
|
// afraid of changing behavior too much in case something relies upon it.
|
|
// So now, for the first five errors, we'll retry immediately. For the next
|
|
// five tries, we'll add a ten second delay between each. After that, we'll
|
|
// give up.
|
|
LogUtils.d(TAG, "ConnectionError #%d, retried %d times, adding delay",
|
|
attachmentId, req.retryCount);
|
|
req.inProgress = false;
|
|
req.retryStartTime = SystemClock.elapsedRealtime() +
|
|
CONNECTION_ERROR_RETRY_MILLIS;
|
|
setWatchdogAlarm(CONNECTION_ERROR_RETRY_MILLIS);
|
|
} else {
|
|
LogUtils.d(TAG, "ConnectionError #%d, retried %d times, adding delay",
|
|
attachmentId, req.retryCount);
|
|
req.inProgress = false;
|
|
req.retryStartTime = 0;
|
|
kick();
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
// If the request is still in the queue, remove it
|
|
if (req != null) {
|
|
remove(req);
|
|
}
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
long secs = 0;
|
|
if (req != null) {
|
|
secs = (System.currentTimeMillis() - req.time) / 1000;
|
|
}
|
|
String status = (statusCode == EmailServiceStatus.SUCCESS) ? "Success" :
|
|
"Error " + statusCode;
|
|
LogUtils.d(TAG, "<< Download finished for attachment #" + attachmentId + "; " + secs
|
|
+ " seconds from request, status: " + status);
|
|
}
|
|
|
|
Attachment attachment = Attachment.restoreAttachmentWithId(mContext, attachmentId);
|
|
if (attachment != null) {
|
|
long accountId = attachment.mAccountKey;
|
|
// Update our attachment storage for this account
|
|
Long currentStorage = mAttachmentStorageMap.get(accountId);
|
|
if (currentStorage == null) {
|
|
currentStorage = 0L;
|
|
}
|
|
mAttachmentStorageMap.put(accountId, currentStorage + attachment.mSize);
|
|
boolean deleted = false;
|
|
if ((attachment.mFlags & Attachment.FLAG_DOWNLOAD_FORWARD) != 0) {
|
|
if (statusCode == EmailServiceStatus.ATTACHMENT_NOT_FOUND) {
|
|
// If this is a forwarding download, and the attachment doesn't exist (or
|
|
// can't be downloaded) delete it from the outgoing message, lest that
|
|
// message never get sent
|
|
EmailContent.delete(mContext, Attachment.CONTENT_URI, attachment.mId);
|
|
// TODO: Talk to UX about whether this is even worth doing
|
|
NotificationController nc = NotificationController.getInstance(mContext);
|
|
nc.showDownloadForwardFailedNotification(attachment);
|
|
deleted = true;
|
|
}
|
|
// If we're an attachment on forwarded mail, and if we're not still blocked,
|
|
// try to send pending mail now (as mediated by MailService)
|
|
if ((req != null) &&
|
|
!Utility.hasUnloadedAttachments(mContext, attachment.mMessageKey)) {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, "== Downloads finished for outgoing msg #"
|
|
+ req.messageId);
|
|
}
|
|
EmailServiceProxy service = EmailServiceUtils.getServiceForAccount(
|
|
mContext, accountId);
|
|
try {
|
|
service.sendMail(accountId);
|
|
} catch (RemoteException e) {
|
|
// We tried
|
|
}
|
|
}
|
|
}
|
|
if (statusCode == EmailServiceStatus.MESSAGE_NOT_FOUND) {
|
|
Message msg = Message.restoreMessageWithId(mContext, attachment.mMessageKey);
|
|
if (msg == null) {
|
|
// If there's no associated message, delete the attachment
|
|
EmailContent.delete(mContext, Attachment.CONTENT_URI, attachment.mId);
|
|
} else {
|
|
// If there really is a message, retry
|
|
// TODO: How will this get retried? It's still marked as inProgress?
|
|
kick();
|
|
return;
|
|
}
|
|
} else if (!deleted) {
|
|
// Clear the download flags, since we're done for now. Note that this happens
|
|
// only for non-recoverable errors. When these occur for forwarded mail, we can
|
|
// ignore it and continue; otherwise, it was either 1) a user request, in which
|
|
// case the user can retry manually or 2) an opportunistic download, in which
|
|
// case the download wasn't critical
|
|
ContentValues cv = new ContentValues();
|
|
int flags =
|
|
Attachment.FLAG_DOWNLOAD_FORWARD | Attachment.FLAG_DOWNLOAD_USER_REQUEST;
|
|
cv.put(AttachmentColumns.FLAGS, attachment.mFlags &= ~flags);
|
|
cv.put(AttachmentColumns.UI_STATE, AttachmentState.SAVED);
|
|
attachment.update(mContext, cv);
|
|
}
|
|
}
|
|
// Process the queue
|
|
kick();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Calculate the download priority of an Attachment. A priority of zero means that the
|
|
* attachment is not marked for download.
|
|
* @param att the Attachment
|
|
* @return the priority key of the Attachment
|
|
*/
|
|
private static int getPriority(Attachment att) {
|
|
int priorityClass = PRIORITY_NONE;
|
|
int flags = att.mFlags;
|
|
if ((flags & Attachment.FLAG_DOWNLOAD_FORWARD) != 0) {
|
|
priorityClass = PRIORITY_SEND_MAIL;
|
|
} else if ((flags & Attachment.FLAG_DOWNLOAD_USER_REQUEST) != 0) {
|
|
priorityClass = PRIORITY_FOREGROUND;
|
|
}
|
|
return priorityClass;
|
|
}
|
|
|
|
private void kick() {
|
|
synchronized(mLock) {
|
|
mLock.notify();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* We use an EmailServiceCallback to keep track of the progress of downloads. These callbacks
|
|
* come from either Controller (IMAP) or ExchangeService (EAS). Note that we only implement the
|
|
* single callback that's defined by the EmailServiceCallback interface.
|
|
*/
|
|
private class ServiceCallback extends IEmailServiceCallback.Stub {
|
|
@Override
|
|
public void loadAttachmentStatus(long messageId, long attachmentId, int statusCode,
|
|
int progress) {
|
|
// Record status and progress
|
|
DownloadRequest req = mDownloadSet.getDownloadInProgress(attachmentId);
|
|
if (req != null) {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
String code;
|
|
switch(statusCode) {
|
|
case EmailServiceStatus.SUCCESS: code = "Success"; break;
|
|
case EmailServiceStatus.IN_PROGRESS: code = "In progress"; break;
|
|
default: code = Integer.toString(statusCode); break;
|
|
}
|
|
if (statusCode != EmailServiceStatus.IN_PROGRESS) {
|
|
LogUtils.d(TAG, ">> Attachment status " + attachmentId + ": " + code);
|
|
} else if (progress >= (req.lastProgress + 10)) {
|
|
LogUtils.d(TAG, ">> Attachment progress %d: %d%%", attachmentId, progress);
|
|
}
|
|
}
|
|
req.lastStatusCode = statusCode;
|
|
req.lastProgress = progress;
|
|
req.lastCallbackTime = System.currentTimeMillis();
|
|
Attachment attachment = Attachment.restoreAttachmentWithId(mContext, attachmentId);
|
|
if (attachment != null && statusCode == EmailServiceStatus.IN_PROGRESS) {
|
|
ContentValues values = new ContentValues();
|
|
values.put(AttachmentColumns.UI_DOWNLOADED_SIZE,
|
|
attachment.mSize * progress / 100);
|
|
// Update UIProvider with updated download size
|
|
// Individual services will set contentUri and state when finished
|
|
attachment.update(mContext, values);
|
|
}
|
|
}
|
|
switch (statusCode) {
|
|
case EmailServiceStatus.IN_PROGRESS:
|
|
break;
|
|
default:
|
|
mDownloadSet.endDownload(attachmentId, statusCode);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*package*/ void addServiceIntentForTest(long accountId, Intent intent) {
|
|
mAccountServiceMap.put(accountId, intent);
|
|
}
|
|
|
|
/*package*/ void onChange(Attachment att) {
|
|
mDownloadSet.onChange(this, att);
|
|
}
|
|
|
|
/*package*/ boolean isQueued(long attachmentId) {
|
|
return mDownloadSet.findDownloadRequest(attachmentId) != null;
|
|
}
|
|
|
|
/*package*/ int getSize() {
|
|
return mDownloadSet.size();
|
|
}
|
|
|
|
/*package*/ boolean dequeue(long attachmentId) {
|
|
DownloadRequest req = mDownloadSet.findDownloadRequest(attachmentId);
|
|
if (req != null) {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, "Dequeued attachmentId: " + attachmentId);
|
|
}
|
|
mDownloadSet.remove(req);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Ask the service for the number of items in the download queue
|
|
* @return the number of items queued for download
|
|
*/
|
|
public static int getQueueSize() {
|
|
AttachmentDownloadService service = sRunningService;
|
|
if (service != null) {
|
|
return service.getSize();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Ask the service whether a particular attachment is queued for download
|
|
* @param attachmentId the id of the Attachment (as stored by EmailProvider)
|
|
* @return whether or not the attachment is queued for download
|
|
*/
|
|
public static boolean isAttachmentQueued(long attachmentId) {
|
|
AttachmentDownloadService service = sRunningService;
|
|
if (service != null) {
|
|
return service.isQueued(attachmentId);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Ask the service to remove an attachment from the download queue
|
|
* @param attachmentId the id of the Attachment (as stored by EmailProvider)
|
|
* @return whether or not the attachment was removed from the queue
|
|
*/
|
|
public static boolean cancelQueuedAttachment(long attachmentId) {
|
|
AttachmentDownloadService service = sRunningService;
|
|
if (service != null) {
|
|
return service.dequeue(attachmentId);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public static void watchdogAlarm() {
|
|
AttachmentDownloadService service = sRunningService;
|
|
if (service != null) {
|
|
service.mDownloadSet.onWatchdogAlarm();
|
|
}
|
|
}
|
|
|
|
// The queue entries here are entries of the form {id, flags}, with the values passed in to
|
|
// attachmentChanged()
|
|
private static final Queue<long[]> sAttachmentChangedQueue =
|
|
new ConcurrentLinkedQueue<long[]>();
|
|
private static AsyncTask<Void, Void, Void> sAttachmentChangedTask;
|
|
|
|
/**
|
|
* Called directly by EmailProvider whenever an attachment is inserted or changed
|
|
* @param context the caller's context
|
|
* @param id the attachment's id
|
|
* @param flags the new flags for the attachment
|
|
*/
|
|
public static void attachmentChanged(final Context context, final long id, final int flags) {
|
|
synchronized (sAttachmentChangedQueue) {
|
|
sAttachmentChangedQueue.add(new long[]{id, flags});
|
|
|
|
if (sAttachmentChangedTask == null) {
|
|
sAttachmentChangedTask = new AsyncTask<Void, Void, Void>() {
|
|
@Override
|
|
protected Void doInBackground(Void... params) {
|
|
while (true) {
|
|
final long[] change;
|
|
synchronized (sAttachmentChangedQueue) {
|
|
change = sAttachmentChangedQueue.poll();
|
|
if (change == null) {
|
|
sAttachmentChangedTask = null;
|
|
return null;
|
|
}
|
|
}
|
|
final long id = change[0];
|
|
final long flags = change[1];
|
|
final Attachment attachment =
|
|
Attachment.restoreAttachmentWithId(context, id);
|
|
if (attachment == null) {
|
|
continue;
|
|
}
|
|
attachment.mFlags = (int) flags;
|
|
final Intent intent =
|
|
new Intent(context, AttachmentDownloadService.class);
|
|
intent.putExtra(EXTRA_ATTACHMENT, attachment);
|
|
context.startService(intent);
|
|
}
|
|
}
|
|
}.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Determine whether an attachment can be prefetched for the given account
|
|
* @return true if download is allowed, false otherwise
|
|
*/
|
|
public boolean canPrefetchForAccount(Account account, File dir) {
|
|
// Check account, just in case
|
|
if (account == null) return false;
|
|
// First, check preference and quickly return if prefetch isn't allowed
|
|
if ((account.mFlags & Account.FLAGS_BACKGROUND_ATTACHMENTS) == 0) return false;
|
|
|
|
long totalStorage = dir.getTotalSpace();
|
|
long usableStorage = dir.getUsableSpace();
|
|
long minAvailable = (long)(totalStorage * PREFETCH_MINIMUM_STORAGE_AVAILABLE);
|
|
|
|
// If there's not enough overall storage available, stop now
|
|
if (usableStorage < minAvailable) {
|
|
return false;
|
|
}
|
|
|
|
int numberOfAccounts = mAccountManagerStub.getNumberOfAccounts();
|
|
long perAccountMaxStorage =
|
|
(long)(totalStorage * PREFETCH_MAXIMUM_ATTACHMENT_STORAGE / numberOfAccounts);
|
|
|
|
// Retrieve our idea of currently used attachment storage; since we don't track deletions,
|
|
// this number is the "worst case". If the number is greater than what's allowed per
|
|
// account, we walk the directory to determine the actual number
|
|
Long accountStorage = mAttachmentStorageMap.get(account.mId);
|
|
if (accountStorage == null || (accountStorage > perAccountMaxStorage)) {
|
|
// Calculate the exact figure for attachment storage for this account
|
|
accountStorage = 0L;
|
|
File[] files = dir.listFiles();
|
|
if (files != null) {
|
|
for (File file : files) {
|
|
accountStorage += file.length();
|
|
}
|
|
}
|
|
// Cache the value
|
|
mAttachmentStorageMap.put(account.mId, accountStorage);
|
|
}
|
|
|
|
// Return true if we're using less than the maximum per account
|
|
if (accountStorage < perAccountMaxStorage) {
|
|
return true;
|
|
} else {
|
|
if (LogUtils.isLoggable(TAG, LogUtils.DEBUG)) {
|
|
LogUtils.d(TAG, ">> Prefetch not allowed for account " + account.mId + "; used " +
|
|
accountStorage + ", limit " + perAccountMaxStorage);
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void run() {
|
|
// These fields are only used within the service thread
|
|
mContext = this;
|
|
mConnectivityManager = new EmailConnectivityManager(this, TAG);
|
|
mAccountManagerStub = new AccountManagerStub(this);
|
|
|
|
// Run through all attachments in the database that require download and add them to
|
|
// the queue
|
|
int mask = Attachment.FLAG_DOWNLOAD_FORWARD | Attachment.FLAG_DOWNLOAD_USER_REQUEST;
|
|
Cursor c = getContentResolver().query(Attachment.CONTENT_URI,
|
|
EmailContent.ID_PROJECTION, "(" + AttachmentColumns.FLAGS + " & ?) != 0",
|
|
new String[] {Integer.toString(mask)}, null);
|
|
try {
|
|
LogUtils.d(TAG, "Count: " + c.getCount());
|
|
while (c.moveToNext()) {
|
|
Attachment attachment = Attachment.restoreAttachmentWithId(
|
|
this, c.getLong(EmailContent.ID_PROJECTION_COLUMN));
|
|
if (attachment != null) {
|
|
mDownloadSet.onChange(this, attachment);
|
|
}
|
|
}
|
|
} catch (Exception e) {
|
|
e.printStackTrace();
|
|
}
|
|
finally {
|
|
c.close();
|
|
}
|
|
|
|
// Loop until stopped, with a 30 minute wait loop
|
|
while (!mStop) {
|
|
// Here's where we run our attachment loading logic...
|
|
// Make a local copy of the variable so we don't null-crash on service shutdown
|
|
final EmailConnectivityManager ecm = mConnectivityManager;
|
|
if (ecm != null) {
|
|
ecm.waitForConnectivity();
|
|
}
|
|
if (mStop) {
|
|
// We might be bailing out here due to the service shutting down
|
|
break;
|
|
}
|
|
mDownloadSet.processQueue();
|
|
if (mDownloadSet.isEmpty()) {
|
|
LogUtils.d(TAG, "*** All done; shutting down service");
|
|
stopSelf();
|
|
break;
|
|
}
|
|
synchronized(mLock) {
|
|
try {
|
|
mLock.wait(PROCESS_QUEUE_WAIT_TIME);
|
|
} catch (InterruptedException e) {
|
|
// That's ok; we'll just keep looping
|
|
}
|
|
}
|
|
}
|
|
|
|
// Unregister now that we're done
|
|
// Make a local copy of the variable so we don't null-crash on service shutdown
|
|
final EmailConnectivityManager ecm = mConnectivityManager;
|
|
if (ecm != null) {
|
|
ecm.unregister();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public int onStartCommand(Intent intent, int flags, int startId) {
|
|
if (sRunningService == null) {
|
|
sRunningService = this;
|
|
}
|
|
if (intent != null && intent.hasExtra(EXTRA_ATTACHMENT)) {
|
|
Attachment att = intent.getParcelableExtra(EXTRA_ATTACHMENT);
|
|
onChange(att);
|
|
}
|
|
return Service.START_STICKY;
|
|
}
|
|
|
|
@Override
|
|
public void onCreate() {
|
|
// Start up our service thread
|
|
new Thread(this, "AttachmentDownloadService").start();
|
|
}
|
|
@Override
|
|
public IBinder onBind(Intent intent) {
|
|
return null;
|
|
}
|
|
|
|
@Override
|
|
public void onDestroy() {
|
|
// Mark this instance of the service as stopped
|
|
mStop = true;
|
|
if (sRunningService != null) {
|
|
kick();
|
|
sRunningService = null;
|
|
}
|
|
if (mConnectivityManager != null) {
|
|
mConnectivityManager.unregister();
|
|
mConnectivityManager.stopWait();
|
|
mConnectivityManager = null;
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
|
|
pw.println("AttachmentDownloadService");
|
|
long time = System.currentTimeMillis();
|
|
synchronized(mDownloadSet) {
|
|
pw.println(" Queue, " + mDownloadSet.size() + " entries");
|
|
Iterator<DownloadRequest> iterator = mDownloadSet.descendingIterator();
|
|
// First, start up any required downloads, in priority order
|
|
while (iterator.hasNext()) {
|
|
DownloadRequest req = iterator.next();
|
|
pw.println(" Account: " + req.accountId + ", Attachment: " + req.attachmentId);
|
|
pw.println(" Priority: " + req.priority + ", Time: " + req.time +
|
|
(req.inProgress ? " [In progress]" : ""));
|
|
Attachment att = Attachment.restoreAttachmentWithId(this, req.attachmentId);
|
|
if (att == null) {
|
|
pw.println(" Attachment not in database?");
|
|
} else if (att.mFileName != null) {
|
|
String fileName = att.mFileName;
|
|
String suffix = "[none]";
|
|
int lastDot = fileName.lastIndexOf('.');
|
|
if (lastDot >= 0) {
|
|
suffix = fileName.substring(lastDot);
|
|
}
|
|
pw.print(" Suffix: " + suffix);
|
|
if (att.getContentUri() != null) {
|
|
pw.print(" ContentUri: " + att.getContentUri());
|
|
}
|
|
pw.print(" Mime: ");
|
|
if (att.mMimeType != null) {
|
|
pw.print(att.mMimeType);
|
|
} else {
|
|
pw.print(AttachmentUtilities.inferMimeType(fileName, null));
|
|
pw.print(" [inferred]");
|
|
}
|
|
pw.println(" Size: " + att.mSize);
|
|
}
|
|
if (req.inProgress) {
|
|
pw.println(" Status: " + req.lastStatusCode + ", Progress: " +
|
|
req.lastProgress);
|
|
pw.println(" Started: " + req.startTime + ", Callback: " +
|
|
req.lastCallbackTime);
|
|
pw.println(" Elapsed: " + ((time - req.startTime) / 1000L) + "s");
|
|
if (req.lastCallbackTime > 0) {
|
|
pw.println(" CB: " + ((time - req.lastCallbackTime) / 1000L) + "s");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|