Add throttling when restoring E-Hentai/ExHentai galleries.

app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt

@@ -30,8 +30,10 @@ import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.data.track.TrackManager
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
+import eu.kanade.tachiyomi.source.online.all.EHentai
 import eu.kanade.tachiyomi.util.sendLocalBroadcast
 import eu.kanade.tachiyomi.util.syncChaptersWithSource
+import exh.eh.EHentaiThrottleManager
 import rx.Observable
 import timber.log.Timber
 import uy.kohesive.injekt.injectLazy
@@ -280,9 +282,12 @@ class BackupManager(val context: Context, version: Int = CURRENT_VERSION) {
      * @param manga manga that needs updating
      * @return [Observable] that contains manga
      */
-    fun restoreChapterFetchObservable(source: Source, manga: Manga, chapters: List<Chapter>): Observable<Pair<List<Chapter>, List<Chapter>>> {
-        return source.fetchChapterList(manga)
-                .map { syncChaptersWithSource(databaseHelper, it, manga, source) }
+    fun restoreChapterFetchObservable(source: Source, manga: Manga, chapters: List<Chapter>, throttleManager: EHentaiThrottleManager): Observable<Pair<List<Chapter>, List<Chapter>>> {
+        return (if(source is EHentai) {
+            source.fetchChapterList(manga, throttleManager::throttle)
+        } else {
+            source.fetchChapterList(manga)
+        }).map { syncChaptersWithSource(databaseHelper, it, manga, source) }
                 .doOnNext {
                     if (it.first.isNotEmpty()) {
                         chapters.forEach { it.manga_id = manga.id }

app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupRestoreService.kt

@@ -28,11 +28,14 @@ import eu.kanade.tachiyomi.util.chop
 import eu.kanade.tachiyomi.util.isServiceRunning
 import eu.kanade.tachiyomi.util.sendLocalBroadcast
 import exh.BackupEntry
+import exh.EH_SOURCE_ID
 import exh.EXHMigrations
+import exh.EXH_SOURCE_ID
+import exh.eh.EHentaiThrottleManager
+import exh.eh.EHentaiUpdateWorker
 import rx.Observable
 import rx.Subscription
 import rx.schedulers.Schedulers
-import timber.log.Timber
 import uy.kohesive.injekt.injectLazy
 import java.io.File
 import java.text.SimpleDateFormat
@@ -125,6 +128,8 @@ class BackupRestoreService : Service() {
 
     private lateinit var executor: ExecutorService
 
+    private val throttleManager = EHentaiThrottleManager()
+
     /**
      * Method called when the service is created. It injects dependencies and acquire the wake lock.
      */
@@ -167,13 +172,23 @@ class BackupRestoreService : Service() {
 
         val uri = intent.getParcelableExtra<Uri>(BackupConst.EXTRA_URI)
 
+        throttleManager.resetThrottle()
+
         // Unsubscribe from any previous subscription if needed.
         subscription?.unsubscribe()
 
         subscription = Observable.using(
-                { db.lowLevel().beginTransaction() },
+                {
+                    // Pause auto-gallery-update during restore
+                    EHentaiUpdateWorker.cancelBackground(this)
+                    db.lowLevel().beginTransaction()
+                },
                 { getRestoreObservable(uri).doOnNext { db.lowLevel().setTransactionSuccessful() } },
-                { executor.execute { db.lowLevel().endTransaction() } })
+                {
+                    // Resume auto-gallery-update
+                    EHentaiUpdateWorker.scheduleBackground(this)
+                    executor.execute { db.lowLevel().endTransaction() }
+                })
                 .doAfterTerminate { stopSelf(startId) }
                 .subscribeOn(Schedulers.from(executor))
                 .subscribe()
@@ -340,6 +355,9 @@ class BackupRestoreService : Service() {
     private fun mangaFetchObservable(source: Source, manga: Manga, chapters: List<Chapter>,
                                      categories: List<String>, history: List<DHistory>,
                                      tracks: List<Track>): Observable<Manga> {
+        if(source.id == EH_SOURCE_ID || source.id == EXH_SOURCE_ID)
+            throttleManager.throttle()
+
         return backupManager.restoreMangaFetchObservable(source, manga)
                 .onErrorReturn {
                     // [EXH]
@@ -419,7 +437,7 @@ class BackupRestoreService : Service() {
      * @return [Observable] that contains manga
      */
     private fun chapterFetchObservable(source: Source, manga: Manga, chapters: List<Chapter>): Observable<Pair<List<Chapter>, List<Chapter>>> {
-        return backupManager.restoreChapterFetchObservable(source, manga, chapters)
+        return backupManager.restoreChapterFetchObservable(source, manga, chapters, throttleManager)
                 // If there's any error, return empty update and continue.
                 .onErrorReturn {
                     // [EXH]

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt

@@ -305,7 +305,7 @@ class SettingsBackupController : SettingsController() {
         override fun onCreateDialog(savedViewState: Bundle?): Dialog {
             return MaterialDialog.Builder(activity!!)
                     .title(R.string.pref_restore_backup)
-                    .content(R.string.backup_restore_content)
+                    .content(activity!!.getString(R.string.backup_restore_content) + "\n\nThe app will throttle when restoring EHentai/ExHentai backups. This may cause the app to appear frozen when it is actually still working. Report an issue if the app remains frozen for more than 30 minutes however.")
                     .positiveText(R.string.action_restore)
                     .onPositive { _, _ ->
                         val context = applicationContext

app/src/main/java/exh/GalleryAdder.kt

@@ -176,7 +176,12 @@ class GalleryAdder {
 
             //Fetch and copy chapters
             try {
-                sourceObj.fetchChapterList(manga).map {
+                val chapterListObs = if(sourceObj is EHentai) {
+                    sourceObj.fetchChapterList(manga, throttleFunc)
+                } else {
+                    sourceObj.fetchChapterList(manga)
+                }
+                chapterListObs.map {
                     syncChaptersWithSource(db, it, manga, sourceObj)
                 }.toBlocking().first()
             } catch (e: Exception) {

app/src/main/java/exh/eh/EHentaiThrottleManager.kt

@@ -0,0 +1,31 @@
+package exh.eh
+
+class EHentaiThrottleManager(private val max: Int = THROTTLE_MAX,
+                             private val inc: Int = THROTTLE_INC) {
+    private var lastThrottleTime: Long = 0
+    var throttleTime: Long = 0
+        private set
+
+    fun throttle() {
+        //Throttle requests if necessary
+        val now = System.currentTimeMillis()
+        val timeDiff = now - lastThrottleTime
+        if(timeDiff < throttleTime)
+            Thread.sleep(throttleTime - timeDiff)
+
+        if(throttleTime < max)
+            throttleTime += inc
+
+        lastThrottleTime = System.currentTimeMillis()
+    }
+
+    fun resetThrottle() {
+        lastThrottleTime = 0
+        throttleTime = 0
+    }
+
+    companion object {
+        const val THROTTLE_MAX = 5500
+        const val THROTTLE_INC = 20
+    }
+}

app/src/main/java/exh/favorites/FavoritesSyncHelper.kt

@@ -17,6 +17,7 @@ import eu.kanade.tachiyomi.util.powerManager
 import eu.kanade.tachiyomi.util.toast
 import eu.kanade.tachiyomi.util.wifiManager
 import exh.*
+import exh.eh.EHentaiThrottleManager
 import exh.eh.EHentaiUpdateWorker
 import exh.util.ignore
 import exh.util.trans
@@ -42,8 +43,7 @@ class FavoritesSyncHelper(val context: Context) {
 
     private val galleryAdder = GalleryAdder()
 
-    private var lastThrottleTime: Long = 0
-    private var throttleTime: Long = 0
+    private val throttleManager = EHentaiThrottleManager()
 
     private var wifiLock: WifiManager.WifiLock? = null
     private var wakeLock: PowerManager.WakeLock? = null
@@ -294,12 +294,12 @@ class FavoritesSyncHelper(val context: Context) {
         }
 
         //Apply additions
-        resetThrottle()
+        throttleManager.resetThrottle()
         changeSet.added.forEachIndexed { index, it ->
             status.onNext(FavoritesSyncStatus.Processing("Adding gallery ${index + 1} of ${changeSet.added.size} to remote server",
                     needWarnThrottle()))
 
-            throttle()
+            throttleManager.throttle()
 
             addGalleryRemote(errorList, it)
         }
@@ -335,18 +335,18 @@ class FavoritesSyncHelper(val context: Context) {
         val categories = db.getCategories().executeAsBlocking()
 
         //Apply additions
-        resetThrottle()
+        throttleManager.resetThrottle()
         changeSet.added.forEachIndexed { index, it ->
             status.onNext(FavoritesSyncStatus.Processing("Adding gallery ${index + 1} of ${changeSet.added.size} to local library",
                     needWarnThrottle()))
 
-            throttle()
+            throttleManager.throttle()
 
             //Import using gallery adder
             val result = galleryAdder.addGallery("${exh.baseUrl}${it.getUrl()}",
                     true,
                     EXH_SOURCE_ID,
-                    ::throttle)
+                    throttleManager::throttle)
 
             if(result is GalleryAddEvent.Fail) {
                 if(result is GalleryAddEvent.Fail.NotFound) {
@@ -380,32 +380,12 @@ class FavoritesSyncHelper(val context: Context) {
                 }
     }
 
-    fun throttle() {
-        //Throttle requests if necessary
-        val now = System.currentTimeMillis()
-        val timeDiff = now - lastThrottleTime
-        if(timeDiff < throttleTime)
-            Thread.sleep(throttleTime - timeDiff)
-
-        if(throttleTime < THROTTLE_MAX)
-            throttleTime += THROTTLE_INC
-
-        lastThrottleTime = System.currentTimeMillis()
-    }
-
-    fun resetThrottle() {
-        lastThrottleTime = 0
-        throttleTime = 0
-    }
-
     fun needWarnThrottle()
-            = throttleTime >= THROTTLE_WARN
+            = throttleManager.throttleTime >= THROTTLE_WARN
 
     class IgnoredException : RuntimeException()
 
     companion object {
-        private const val THROTTLE_MAX = 5500
-        private const val THROTTLE_INC = 20
         private const val THROTTLE_WARN = 1000
     }
 }