mirror of
https://github.com/libre-tube/LibreTube.git
synced 2024-12-16 07:10:29 +05:30
534 lines
20 KiB
Kotlin
534 lines
20 KiB
Kotlin
package com.github.libretube.services
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import android.app.NotificationManager
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import android.app.PendingIntent.FLAG_CANCEL_CURRENT
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import android.app.PendingIntent.FLAG_UPDATE_CURRENT
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import android.content.Intent
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import android.os.Binder
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import android.os.IBinder
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import android.util.SparseBooleanArray
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import androidx.core.app.NotificationCompat
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import androidx.core.app.PendingIntentCompat
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import androidx.core.app.ServiceCompat
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import androidx.core.content.getSystemService
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import androidx.core.util.remove
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import androidx.core.util.set
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import androidx.core.util.valueIterator
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import androidx.lifecycle.LifecycleService
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import androidx.lifecycle.lifecycleScope
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import com.github.libretube.R
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import com.github.libretube.api.CronetHelper
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import com.github.libretube.api.RetrofitInstance
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import com.github.libretube.constants.DOWNLOAD_CHANNEL_ID
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import com.github.libretube.constants.DOWNLOAD_PROGRESS_NOTIFICATION_ID
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import com.github.libretube.constants.IntentData
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import com.github.libretube.db.DatabaseHolder.Database
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import com.github.libretube.db.obj.Download
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import com.github.libretube.db.obj.DownloadItem
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import com.github.libretube.enums.FileType
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import com.github.libretube.extensions.formatAsFileSize
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import com.github.libretube.extensions.getContentLength
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import com.github.libretube.extensions.parcelableExtra
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import com.github.libretube.extensions.toastFromMainThread
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import com.github.libretube.helpers.DownloadHelper
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import com.github.libretube.helpers.DownloadHelper.getNotificationId
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import com.github.libretube.helpers.ImageHelper
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import com.github.libretube.obj.DownloadStatus
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import com.github.libretube.parcelable.DownloadData
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import com.github.libretube.receivers.NotificationReceiver
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import com.github.libretube.receivers.NotificationReceiver.Companion.ACTION_DOWNLOAD_PAUSE
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import com.github.libretube.receivers.NotificationReceiver.Companion.ACTION_DOWNLOAD_RESUME
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import com.github.libretube.receivers.NotificationReceiver.Companion.ACTION_DOWNLOAD_STOP
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import com.github.libretube.ui.activities.MainActivity
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import java.io.File
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import java.net.HttpURLConnection
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import java.net.SocketTimeoutException
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import java.net.URL
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import java.nio.file.Path
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import java.nio.file.StandardOpenOption
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import java.util.concurrent.Executors
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import kotlin.io.path.createFile
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import kotlin.io.path.deleteIfExists
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import kotlin.io.path.div
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import kotlin.io.path.fileSize
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import kotlin.math.min
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import kotlinx.coroutines.CancellationException
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.SupervisorJob
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import kotlinx.coroutines.asCoroutineDispatcher
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import kotlinx.coroutines.flow.MutableSharedFlow
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import kotlinx.coroutines.flow.SharedFlow
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import kotlinx.coroutines.flow.firstOrNull
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import okio.buffer
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import okio.sink
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import okio.source
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/**
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* Download service with custom implementation of downloading using [HttpURLConnection].
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*/
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class DownloadService : LifecycleService() {
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private val binder = LocalBinder()
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private val dispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher()
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private val coroutineContext = dispatcher + SupervisorJob()
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private lateinit var notificationManager: NotificationManager
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private lateinit var summaryNotificationBuilder: NotificationCompat.Builder
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private val downloadQueue = SparseBooleanArray()
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private val _downloadFlow = MutableSharedFlow<Pair<Int, DownloadStatus>>()
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val downloadFlow: SharedFlow<Pair<Int, DownloadStatus>> = _downloadFlow
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override fun onCreate() {
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super.onCreate()
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IS_DOWNLOAD_RUNNING = true
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notifyForeground()
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sendBroadcast(Intent(ACTION_SERVICE_STARTED))
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}
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override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
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super.onStartCommand(intent, flags, startId)
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val downloadId = intent?.getIntExtra("id", -1)
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when (intent?.action) {
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ACTION_DOWNLOAD_RESUME -> resume(downloadId!!)
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ACTION_DOWNLOAD_PAUSE -> pause(downloadId!!)
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ACTION_DOWNLOAD_STOP -> stop(downloadId!!)
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}
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val downloadData = intent?.parcelableExtra<DownloadData>(IntentData.downloadData)
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?: return START_NOT_STICKY
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val (videoId, name) = downloadData
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val fileName = name.ifEmpty { videoId }
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lifecycleScope.launch(coroutineContext) {
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try {
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val streams = withContext(Dispatchers.IO) {
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RetrofitInstance.api.getStreams(videoId)
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}
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val thumbnailTargetPath = getDownloadPath(DownloadHelper.THUMBNAIL_DIR, fileName)
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val download = Download(
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videoId,
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streams.title,
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streams.description,
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streams.uploader,
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streams.uploadDate,
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thumbnailTargetPath
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)
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Database.downloadDao().insertDownload(download)
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ImageHelper.downloadImage(
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this@DownloadService,
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streams.thumbnailUrl,
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thumbnailTargetPath
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)
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val downloadItems = streams.toDownloadItems(downloadData.copy(fileName = fileName))
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downloadItems.forEach { start(it) }
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} catch (e: Exception) {
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return@launch
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}
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}
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return START_NOT_STICKY
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}
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/**
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* Initiate download [Job] using [DownloadItem] by creating file according to [FileType]
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* for the requested file.
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*/
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private fun start(item: DownloadItem) {
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item.path = when (item.type) {
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FileType.AUDIO -> getDownloadPath(DownloadHelper.AUDIO_DIR, item.fileName)
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FileType.VIDEO -> getDownloadPath(DownloadHelper.VIDEO_DIR, item.fileName)
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FileType.SUBTITLE -> getDownloadPath(DownloadHelper.SUBTITLE_DIR, item.fileName)
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}.apply { deleteIfExists() }.createFile()
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lifecycleScope.launch(coroutineContext) {
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item.id = Database.downloadDao().insertDownloadItem(item).toInt()
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downloadFile(item)
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}
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}
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/**
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* Download file and emit [DownloadStatus] to the collectors of [downloadFlow]
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* and notification.
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*/
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private suspend fun downloadFile(item: DownloadItem) {
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downloadQueue[item.id] = true
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val notificationBuilder = getNotificationBuilder(item)
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setResumeNotification(notificationBuilder, item)
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val path = item.path
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var totalRead = path.fileSize()
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val url = URL(item.url ?: return)
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// only fetch the content length if it's not been returned by the API
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if (item.downloadSize == 0L) {
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url.getContentLength()?.let { size ->
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item.downloadSize = size
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Database.downloadDao().updateDownloadItem(item)
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}
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}
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while (totalRead < item.downloadSize) {
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try {
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val con = startConnection(item, url, totalRead, item.downloadSize) ?: return
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@Suppress("NewApi") // The StandardOpenOption enum is desugared.
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val sink = path.sink(StandardOpenOption.APPEND).buffer()
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val sourceByte = con.inputStream.source()
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var lastTime = System.currentTimeMillis() / 1000
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var lastRead = 0L
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try {
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// Check if downloading is still active and read next bytes.
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while (downloadQueue[item.id] && sourceByte
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.read(sink.buffer, DownloadHelper.DOWNLOAD_CHUNK_SIZE)
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.also { lastRead = it } != -1L
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) {
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sink.emit()
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totalRead += lastRead
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_downloadFlow.emit(
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item.id to DownloadStatus.Progress(
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lastRead,
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totalRead,
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item.downloadSize
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)
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)
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if (item.downloadSize != -1L &&
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System.currentTimeMillis() / 1000 > lastTime
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) {
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notificationBuilder
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.setContentText(
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totalRead.formatAsFileSize() + " / " +
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item.downloadSize.formatAsFileSize()
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)
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.setProgress(
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item.downloadSize.toInt(),
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totalRead.toInt(),
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false
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)
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notificationManager.notify(
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item.getNotificationId(),
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notificationBuilder.build()
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)
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lastTime = System.currentTimeMillis() / 1000
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}
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}
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} catch (_: CancellationException) {
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break
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} catch (e: Exception) {
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toastFromMainThread("${getString(R.string.download)}: ${e.message}")
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_downloadFlow.emit(item.id to DownloadStatus.Error(e.message.toString(), e))
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break
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}
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withContext(Dispatchers.IO) {
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sink.flush()
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sink.close()
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sourceByte.close()
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con.disconnect()
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}
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} catch (_: Exception) {
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break
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}
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}
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val completed = totalRead >= item.downloadSize
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if (completed) {
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_downloadFlow.emit(item.id to DownloadStatus.Completed)
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} else {
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_downloadFlow.emit(item.id to DownloadStatus.Paused)
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}
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setPauseNotification(notificationBuilder, item, completed)
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pause(item.id)
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if (_downloadFlow.firstOrNull { it.first == item.id }?.second == DownloadStatus.Stopped) {
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downloadQueue.remove(item.id, false)
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}
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}
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private suspend fun startConnection(
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item: DownloadItem,
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url: URL,
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alreadyRead: Long,
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readLimit: Long?
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): HttpURLConnection? {
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// Set start range where last downloading was held.
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val con = CronetHelper.cronetEngine.openConnection(url) as HttpURLConnection
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con.requestMethod = "GET"
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val limit = if (readLimit == null) {
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""
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} else {
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min(readLimit, alreadyRead + BYTES_PER_REQUEST)
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}
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con.setRequestProperty("Range", "bytes=$alreadyRead-$limit")
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con.connectTimeout = DownloadHelper.DEFAULT_TIMEOUT
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con.readTimeout = DownloadHelper.DEFAULT_TIMEOUT
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withContext(Dispatchers.IO) {
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// Retry connecting to server for n times.
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for (i in 1..DownloadHelper.DEFAULT_RETRY) {
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try {
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con.connect()
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break
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} catch (_: SocketTimeoutException) {
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val message = getString(R.string.downloadfailed) + " " + i
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_downloadFlow.emit(item.id to DownloadStatus.Error(message))
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toastFromMainThread(message)
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}
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}
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}
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// If link is expired try to regenerate using available info.
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if (con.responseCode == 403) {
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regenerateLink(item)
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con.disconnect()
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downloadFile(item)
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return null
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} else if (con.responseCode !in 200..299) {
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val message = getString(R.string.downloadfailed) + ": " + con.responseMessage
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_downloadFlow.emit(item.id to DownloadStatus.Error(message))
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toastFromMainThread(message)
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con.disconnect()
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pause(item.id)
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return null
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}
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return con
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}
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/**
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* Resume download which may have been paused.
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*/
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fun resume(id: Int) {
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// If file is already downloading then avoid new download job.
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if (downloadQueue[id]) {
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return
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}
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val downloadCount = downloadQueue.valueIterator().asSequence().count { it }
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if (downloadCount >= DownloadHelper.getMaxConcurrentDownloads()) {
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toastFromMainThread(getString(R.string.concurrent_downloads_limit_reached))
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lifecycleScope.launch(coroutineContext) {
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_downloadFlow.emit(id to DownloadStatus.Paused)
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}
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return
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}
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lifecycleScope.launch(coroutineContext) {
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downloadFile(Database.downloadDao().findDownloadItemById(id))
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}
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}
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/**
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* Pause downloading job for given [id]. If no downloads are active, stop the service.
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*/
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fun pause(id: Int) {
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downloadQueue[id] = false
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stopServiceIfDone()
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}
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/**
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* Stop downloading job for given [id]. If no downloads are active, stop the service.
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*/
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private fun stop(id: Int) = CoroutineScope(Dispatchers.IO).launch {
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downloadQueue[id] = false
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_downloadFlow.emit(id to DownloadStatus.Stopped)
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lifecycleScope.launch {
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val item = Database.downloadDao().findDownloadItemById(id)
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notificationManager.cancel(item.getNotificationId())
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Database.downloadDao().deleteDownloadItemById(id)
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stopServiceIfDone()
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}
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}
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/**
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* Stop service if no downloads are active
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*/
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private fun stopServiceIfDone() {
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if (downloadQueue.valueIterator().asSequence().none { it }) {
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ServiceCompat.stopForeground(this@DownloadService, ServiceCompat.STOP_FOREGROUND_DETACH)
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sendBroadcast(Intent(ACTION_SERVICE_STOPPED))
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stopSelf()
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}
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}
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/**
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* Regenerate stream url using available info format and quality.
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*/
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private suspend fun regenerateLink(item: DownloadItem) {
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val streams = RetrofitInstance.api.getStreams(item.videoId)
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val stream = when (item.type) {
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FileType.AUDIO -> streams.audioStreams
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FileType.VIDEO -> streams.videoStreams
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else -> null
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}
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stream?.find {
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it.format == item.format && it.quality == item.quality && it.audioTrackLocale == item.language
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}?.let {
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item.url = it.url
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}
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Database.downloadDao().updateDownloadItem(item)
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}
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/**
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* Check whether the file downloading or not.
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*/
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fun isDownloading(id: Int): Boolean {
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return downloadQueue[id]
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}
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private fun notifyForeground() {
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notificationManager = getSystemService()!!
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summaryNotificationBuilder = NotificationCompat
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.Builder(this, DOWNLOAD_CHANNEL_ID)
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.setSmallIcon(R.drawable.ic_launcher_lockscreen)
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.setContentTitle(getString(R.string.downloading))
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.setForegroundServiceBehavior(NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE)
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.setGroup(DOWNLOAD_NOTIFICATION_GROUP)
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.setPriority(NotificationCompat.PRIORITY_LOW)
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.setOnlyAlertOnce(true)
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.setGroupSummary(true)
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startForeground(DOWNLOAD_PROGRESS_NOTIFICATION_ID, summaryNotificationBuilder.build())
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}
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private fun getNotificationBuilder(item: DownloadItem): NotificationCompat.Builder {
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val intent = Intent(this@DownloadService, MainActivity::class.java)
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.putExtra("fragmentToOpen", "downloads")
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val activityIntent = PendingIntentCompat
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.getActivity(this@DownloadService, 0, intent, FLAG_CANCEL_CURRENT, false)
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return NotificationCompat
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.Builder(this, DOWNLOAD_CHANNEL_ID)
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.setContentTitle("[${item.type}] ${item.fileName}")
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.setProgress(0, 0, true)
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.setOngoing(true)
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.setContentIntent(activityIntent)
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.setForegroundServiceBehavior(NotificationCompat.FOREGROUND_SERVICE_IMMEDIATE)
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.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_SUMMARY)
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.setGroup(DOWNLOAD_NOTIFICATION_GROUP)
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}
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private fun setResumeNotification(
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notificationBuilder: NotificationCompat.Builder,
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item: DownloadItem
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) {
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notificationBuilder
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.setSmallIcon(android.R.drawable.stat_sys_download)
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.setWhen(System.currentTimeMillis())
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.setOngoing(true)
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.clearActions()
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.addAction(getPauseAction(item.id))
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.addAction(getStopAction(item.id))
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notificationManager.notify(item.getNotificationId(), notificationBuilder.build())
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}
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private fun setPauseNotification(
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notificationBuilder: NotificationCompat.Builder,
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item: DownloadItem,
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isCompleted: Boolean = false
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) {
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notificationBuilder
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.setProgress(0, 0, false)
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.setOngoing(false)
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.clearActions()
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if (isCompleted) {
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notificationBuilder
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.setSmallIcon(R.drawable.ic_done)
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.setContentText(getString(R.string.download_completed))
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} else {
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notificationBuilder
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.setSmallIcon(R.drawable.ic_pause)
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.setContentText(getString(R.string.download_paused))
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.addAction(getResumeAction(item.id))
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.addAction(getStopAction(item.id))
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}
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notificationManager.notify(item.getNotificationId(), notificationBuilder.build())
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}
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private fun getResumeAction(id: Int): NotificationCompat.Action {
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val intent = Intent(this, NotificationReceiver::class.java)
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.setAction(ACTION_DOWNLOAD_RESUME)
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.putExtra("id", id)
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return NotificationCompat.Action.Builder(
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R.drawable.ic_play,
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getString(R.string.resume),
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PendingIntentCompat.getBroadcast(this, id, intent, FLAG_UPDATE_CURRENT, false)
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).build()
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}
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private fun getPauseAction(id: Int): NotificationCompat.Action {
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val intent = Intent(this, NotificationReceiver::class.java)
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.setAction(ACTION_DOWNLOAD_PAUSE)
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.putExtra("id", id)
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return NotificationCompat.Action.Builder(
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R.drawable.ic_pause,
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getString(R.string.pause),
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PendingIntentCompat.getBroadcast(this, id, intent, FLAG_UPDATE_CURRENT, false)
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).build()
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}
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private fun getStopAction(id: Int): NotificationCompat.Action {
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val intent = Intent(this, NotificationReceiver::class.java).apply {
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action = ACTION_DOWNLOAD_STOP
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putExtra("id", id)
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}
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// the request code must differ from the one of the pause/resume action
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val requestCode = Int.MAX_VALUE / 2 - id
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return NotificationCompat.Action.Builder(
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R.drawable.ic_stop,
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getString(R.string.stop),
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PendingIntentCompat.getBroadcast(this, requestCode, intent, FLAG_UPDATE_CURRENT, false)
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).build()
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}
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/**
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* Get a [File] from the corresponding download directory and the file name
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*/
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private fun getDownloadPath(directory: String, fileName: String): Path {
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return DownloadHelper.getDownloadDir(this, directory) / fileName
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}
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override fun onDestroy() {
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downloadQueue.clear()
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IS_DOWNLOAD_RUNNING = false
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sendBroadcast(Intent(ACTION_SERVICE_STOPPED))
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super.onDestroy()
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}
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override fun onBind(intent: Intent): IBinder {
|
|
super.onBind(intent)
|
|
intent.getIntArrayExtra("ids")?.forEach { resume(it) }
|
|
return binder
|
|
}
|
|
|
|
inner class LocalBinder : Binder() {
|
|
fun getService(): DownloadService = this@DownloadService
|
|
}
|
|
|
|
companion object {
|
|
private const val DOWNLOAD_NOTIFICATION_GROUP = "download_notification_group"
|
|
const val ACTION_SERVICE_STARTED =
|
|
"com.github.libretube.services.DownloadService.ACTION_SERVICE_STARTED"
|
|
const val ACTION_SERVICE_STOPPED =
|
|
"com.github.libretube.services.DownloadService.ACTION_SERVICE_STOPPED"
|
|
var IS_DOWNLOAD_RUNNING = false
|
|
private const val BYTES_PER_REQUEST = 10000000L
|
|
}
|
|
}
|