Option to slowdown downloads and configure parallelism

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -141,6 +141,12 @@ class AppSettings(context: Context) {
 			}
 		}
 
+	val isDownloadsSlowdownEnabled: Boolean
+		get() = prefs.getBoolean(KEY_DOWNLOADS_SLOWDOWN, false)
+
+	val downloadsParallelism: Int
+		get() = prefs.getInt(KEY_DOWNLOADS_PARALLELISM, 2)
+
 	val isSuggestionsEnabled: Boolean
 		get() = prefs.getBoolean(KEY_SUGGESTIONS, false)
 
@@ -261,6 +267,8 @@ class AppSettings(context: Context) {
 		const val KEY_SUGGESTIONS_EXCLUDE_NSFW = "suggestions_exclude_nsfw"
 		const val KEY_SUGGESTIONS_EXCLUDE_TAGS = "suggestions_exclude_tags"
 		const val KEY_SEARCH_SINGLE_SOURCE = "search_single_source"
+		const val KEY_DOWNLOADS_PARALLELISM = "downloads_parallelism"
+		const val KEY_DOWNLOADS_SLOWDOWN = "downloads_slowdown"
 
 		// About
 		const val KEY_APP_UPDATE = "app_update"

app/src/main/java/org/koitharu/kotatsu/download/domain/DownloadManager.kt

@@ -17,6 +17,7 @@ import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.network.CommonHeaders
 import org.koitharu.kotatsu.core.parser.MangaRepository
+import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.local.data.PagesCache
 import org.koitharu.kotatsu.local.domain.CbzMangaOutput
 import org.koitharu.kotatsu.local.domain.LocalMangaRepository
@@ -30,8 +31,8 @@ import org.koitharu.kotatsu.utils.progress.ProgressJob
 import java.io.File
 
 private const val MAX_DOWNLOAD_ATTEMPTS = 3
-private const val MAX_PARALLEL_DOWNLOADS = 2
 private const val DOWNLOAD_ERROR_DELAY = 500L
+private const val SLOWDOWN_DELAY = 200L
 
 class DownloadManager(
 	private val coroutineScope: CoroutineScope,
@@ -40,9 +41,10 @@ class DownloadManager(
 	private val okHttp: OkHttpClient,
 	private val cache: PagesCache,
 	private val localMangaRepository: LocalMangaRepository,
+	private val settings: AppSettings,
 ) {
 
-	private val connectivityManager = context.applicationContext.getSystemService(
+	private val connectivityManager = context.getSystemService(
 		Context.CONNECTIVITY_SERVICE
 	) as ConnectivityManager
 	private val coverWidth = context.resources.getDimensionPixelSize(
@@ -51,7 +53,7 @@ class DownloadManager(
 	private val coverHeight = context.resources.getDimensionPixelSize(
 		androidx.core.R.dimen.compat_notification_large_icon_max_height
 	)
-	private val semaphore = Semaphore(MAX_PARALLEL_DOWNLOADS)
+	private val semaphore = Semaphore(settings.downloadsParallelism)
 
 	fun downloadManga(
 		manga: Manga,
@@ -141,6 +143,10 @@ class DownloadManager(
 						totalPages = pages.size,
 						currentPage = pageIndex,
 					)
+
+					if (settings.isDownloadsSlowdownEnabled) {
+						delay(SLOWDOWN_DELAY)
+					}
 				}
 			}
 			outState.value = DownloadState.PostProcessing(startId, data, cover)
@@ -206,4 +212,24 @@ class DownloadManager(
 				error = throwable,
 			)
 		}
+
+	class Factory(
+		private val context: Context,
+		private val imageLoader: ImageLoader,
+		private val okHttp: OkHttpClient,
+		private val cache: PagesCache,
+		private val localMangaRepository: LocalMangaRepository,
+		private val settings: AppSettings,
+	) {
+
+		fun create(coroutineScope: CoroutineScope) = DownloadManager(
+			coroutineScope = coroutineScope,
+			context = context,
+			imageLoader = imageLoader,
+			okHttp = okHttp,
+			cache = cache,
+			localMangaRepository = localMangaRepository,
+			settings = settings,
+		)
+	}
 }

app/src/main/java/org/koitharu/kotatsu/download/ui/service/DownloadService.kt

@@ -49,13 +49,8 @@ class DownloadService : BaseService() {
 		notificationSwitcher = ForegroundNotificationSwitcher(this)
 		val wakeLock = (getSystemService(Context.POWER_SERVICE) as PowerManager)
 			.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "kotatsu:downloading")
-		downloadManager = DownloadManager(
+		downloadManager = get<DownloadManager.Factory>().create(
 			coroutineScope = lifecycleScope + WakeLockNode(wakeLock, TimeUnit.HOURS.toMillis(1)),
-			context = this,
-			imageLoader = get(),
-			okHttp = get(),
-			cache = get(),
-			localMangaRepository = get(),
 		)
 		DownloadNotification.createChannel(this)
 		registerReceiver(controlReceiver, IntentFilter(ACTION_DOWNLOAD_CANCEL))

app/src/main/java/org/koitharu/kotatsu/local/LocalModule.kt

@@ -3,6 +3,7 @@ package org.koitharu.kotatsu.local
 import org.koin.android.ext.koin.androidContext
 import org.koin.androidx.viewmodel.dsl.viewModel
 import org.koin.dsl.module
+import org.koitharu.kotatsu.download.domain.DownloadManager
 import org.koitharu.kotatsu.local.data.LocalStorageManager
 import org.koitharu.kotatsu.local.domain.LocalMangaRepository
 import org.koitharu.kotatsu.local.ui.LocalListViewModel
@@ -16,5 +17,7 @@ val localModule
 
 		factory { ExternalStorageHelper(androidContext()) }
 
+		factory { DownloadManager.Factory(androidContext(), get(), get(), get(), get(), get()) }
+
 		viewModel { LocalListViewModel(get(), get(), get(), get()) }
 	}

app/src/main/java/org/koitharu/kotatsu/settings/ContentSettingsFragment.kt

@@ -4,7 +4,6 @@ import android.content.SharedPreferences
 import android.os.Bundle
 import android.view.View
 import androidx.preference.Preference
-import java.io.File
 import kotlinx.coroutines.launch
 import org.koin.android.ext.android.inject
 import org.koitharu.kotatsu.R
@@ -13,8 +12,10 @@ import org.koitharu.kotatsu.base.ui.dialog.StorageSelectDialog
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.local.data.LocalStorageManager
 import org.koitharu.kotatsu.parsers.model.MangaSource
+import org.koitharu.kotatsu.settings.utils.SliderPreference
 import org.koitharu.kotatsu.utils.ext.getStorageName
 import org.koitharu.kotatsu.utils.ext.viewLifecycleScope
+import java.io.File
 
 class ContentSettingsFragment :
 	BasePreferenceFragment(R.string.content),
@@ -29,6 +30,13 @@ class ContentSettingsFragment :
 		findPreference<Preference>(AppSettings.KEY_SUGGESTIONS)?.setSummary(
 			if (settings.isSuggestionsEnabled) R.string.enabled else R.string.disabled
 		)
+		findPreference<SliderPreference>(AppSettings.KEY_DOWNLOADS_PARALLELISM)?.run {
+			summary = value.toString()
+			setOnPreferenceChangeListener { preference, newValue ->
+				preference.summary = newValue.toString()
+				true
+			}
+		}
 		bindRemoteSourcesSummary()
 	}
 

app/src/main/java/org/koitharu/kotatsu/utils/ext/AndroidExt.kt

@@ -17,6 +17,7 @@ suspend fun ConnectivityManager.waitForNetwork(): Network {
 	return suspendCancellableCoroutine { cont ->
 		val callback = object : ConnectivityManager.NetworkCallback() {
 			override fun onAvailable(network: Network) {
+				unregisterNetworkCallback(this)
 				if (cont.isActive) {
 					cont.resume(network)
 				}

app/src/main/res/layout/preference_slider.xml

@@ -5,13 +5,12 @@
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
-	android:background="?android:attr/selectableItemBackground"
 	android:baselineAligned="false"
 	android:clipChildren="false"
 	android:clipToPadding="false"
-	android:orientation="horizontal"
 	android:gravity="center_vertical"
 	android:minHeight="?android:attr/listPreferredItemHeightSmall"
+	android:orientation="horizontal"
 	android:paddingStart="?android:attr/listPreferredItemPaddingStart"
 	android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
 	tools:ignore="PrivateResource">
@@ -27,17 +26,18 @@
 		android:clipToPadding="false"
 		android:orientation="vertical">
 
-		<RelativeLayout
+		<LinearLayout
-			android:layout_width="wrap_content"
+			android:layout_width="match_parent"
-			android:layout_height="0dp"
+			android:orientation="horizontal"
-			android:layout_weight="1">
+			android:baselineAligned="true"
+			android:baselineAlignedChildIndex="0"
+			android:layout_height="wrap_content">
 
 			<TextView
 				android:id="@android:id/title"
 				android:layout_width="0dp"
+				android:layout_weight="1"
 				android:layout_height="wrap_content"
-				android:layout_alignParentStart="true"
-				android:layout_toStartOf="@android:id/summary"
 				android:ellipsize="marquee"
 				android:labelFor="@id/seekbar"
 				android:singleLine="true"
@@ -49,12 +49,11 @@
 				style="@style/PreferenceSummaryTextStyle"
 				android:layout_width="wrap_content"
 				android:layout_height="wrap_content"
-				android:layout_alignParentEnd="true"
 				android:singleLine="true"
 				android:textAlignment="viewStart"
 				android:textColor="?android:attr/textColorSecondary" />
 
-		</RelativeLayout>
+		</LinearLayout>
 
 		<com.google.android.material.slider.Slider
 			android:id="@+id/slider"

app/src/main/res/values-ru/strings.xml

@@ -271,4 +271,7 @@
 	<string name="text_delete_local_manga_batch">Удалить выбранную мангу с накопителя?</string>
 	<string name="removal_completed">Удаление завершено</string>
 	<string name="batch_manga_save_confirm">Загрузить выбранную мангу со всеми главами? Это может привести к большому расходу трафика и места на накопителе</string>
+	<string name="parallel_downloads">Загружать параллельно</string>
+	<string name="download_slowdown">Замедление загрузки</string>
+	<string name="download_slowdown_summary">Помогает избежать блокировки IP-адреса</string>
 </resources>

app/src/main/res/values/strings.xml

@@ -274,4 +274,7 @@
 	<string name="text_delete_local_manga_batch">Delete selected items from device permanently?</string>
 	<string name="removal_completed">Removal completed</string>
 	<string name="batch_manga_save_confirm">Are you sure you want to download all selected manga with all its chapters? This action can consume a lot of traffic and storage</string>
+	<string name="parallel_downloads">Parallel downloads</string>
+	<string name="download_slowdown">Download slowdown</string>
+	<string name="download_slowdown_summary">Helps avoid blocking your IP address</string>
 </resources>

app/src/main/res/xml/pref_content.xml

@@ -8,17 +8,32 @@
 		android:key="remote_sources"
 		android:title="@string/remote_sources" />
 
-	<Preference
-		android:key="local_storage"
-		android:persistent="false"
-		android:title="@string/manga_save_location" />
-
 	<PreferenceScreen
 		android:fragment="org.koitharu.kotatsu.settings.SuggestionsSettingsFragment"
 		android:key="suggestions"
 		android:persistent="false"
 		android:title="@string/suggestions" />
 
+	<Preference
+		android:key="local_storage"
+		android:persistent="false"
+		android:title="@string/manga_save_location"
+		app:allowDividerAbove="true" />
+
+	<SwitchPreferenceCompat
+		android:defaultValue="false"
+		android:key="downloads_slowdown"
+		android:summary="@string/download_slowdown_summary"
+		android:title="@string/download_slowdown" />
+
+	<org.koitharu.kotatsu.settings.utils.SliderPreference
+		android:key="downloads_parallelism"
+		android:stepSize="1"
+		android:title="@string/parallel_downloads"
+		android:valueFrom="1"
+		android:valueTo="5"
+		app:defaultValue="2" />
+
 	<PreferenceScreen
 		android:fragment="org.koitharu.kotatsu.settings.backup.BackupSettingsFragment"
 		android:title="@string/backup_restore"