Fix feed loading and show a dialog for each invalid subscription

app/src/main/java/org/schabi/newpipe/local/feed/FeedFragment.kt

@@ -19,7 +19,6 @@
 
 package org.schabi.newpipe.local.feed
 
-import android.content.DialogInterface
 import android.content.Intent
 import android.os.Bundle
 import android.os.Parcelable
@@ -256,8 +255,6 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
             listState = null
         }
 
-        oldestSubscriptionUpdate = loadedState.oldestUpdate
-
         val feedsNotLoaded = loadedState.notLoadedCount > 0
         feedBinding.refreshSubtitleText.isVisible = feedsNotLoaded
         if (feedsNotLoaded) {
@@ -267,6 +264,12 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
             )
         }
 
+        if (oldestSubscriptionUpdate != loadedState.oldestUpdate) {
+            // ignore errors if they have already been handled for the current update
+            handleItemsErrors(loadedState.itemsErrors)
+        }
+        oldestSubscriptionUpdate = loadedState.oldestUpdate
+
         if (loadedState.items.isEmpty()) {
             showEmptyState()
         } else {
@@ -279,11 +282,19 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
             hideLoading()
             false
         } else {
-            if (errorState.error is FeedLoadService.RequestException) {
+            showError(ErrorInfo(errorState.error, UserAction.REQUESTED_FEED, "Loading feed"))
-                disposables.add(
+            true
+        }
+    }
+
+    private fun handleItemsErrors(errors: List<Throwable>) {
+        errors.forEachIndexed() { i, t ->
+            if (t is FeedLoadService.RequestException &&
+                t.cause is ContentNotAvailableException
+            ) {
                 Single.fromCallable {
                     NewPipeDatabase.getInstance(requireContext()).subscriptionDAO()
-                            .getSubscription(errorState.error.subscriptionId)
+                        .getSubscription(t.subscriptionId)
                 }.subscribeOn(Schedulers.io())
                     .observeOn(AndroidSchedulers.mainThread())
                     .subscribe(
@@ -291,39 +302,39 @@ class FeedFragment : BaseListFragment<FeedState, Unit>() {
                             subscriptionEntity ->
                             handleFeedNotAvailable(
                                 subscriptionEntity,
-                                    errorState.error.cause?.cause
+                                t.cause?.cause,
+                                errors.subList(i + 1, errors.size)
                             )
                         },
                         { throwable -> throwable.printStackTrace() }
                     )
-                )
+                return // this will be called on the remaining errors by handleFeedNotAvailable()
-            } else {
-                showError(ErrorInfo(errorState.error, UserAction.REQUESTED_FEED, "Loading feed"))
             }
-            true
         }
     }
 
     private fun handleFeedNotAvailable(
         subscriptionEntity: SubscriptionEntity,
-        @Nullable cause: Throwable?
+        @Nullable cause: Throwable?,
+        nextItemsErrors: List<Throwable>
     ) {
         val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(requireContext())
         val isFastFeedModeEnabled = sharedPreferences.getBoolean(
             getString(R.string.feed_use_dedicated_fetch_method_key), false
         )
+
         val builder = AlertDialog.Builder(requireContext())
             .setTitle(R.string.feed_load_error)
             .setPositiveButton(
-                R.string.unsubscribe,
+                R.string.unsubscribe
-                DialogInterface.OnClickListener {
+            ) { _, _ ->
-                    _, _ ->
                 SubscriptionManager(requireContext()).deleteSubscription(
                     subscriptionEntity.serviceId, subscriptionEntity.url
                 ).subscribe()
+                handleItemsErrors(nextItemsErrors)
             }
-            )
+            .setNegativeButton(R.string.cancel) { _, _ -> }
-            .setNegativeButton(R.string.cancel, DialogInterface.OnClickListener { _, _ -> })
+
         var message = getString(R.string.feed_load_error_account_info, subscriptionEntity.name)
         if (cause is AccountTerminatedException) {
             message += "\n" + getString(R.string.feed_load_error_terminated)

app/src/main/java/org/schabi/newpipe/local/feed/service/FeedLoadService.kt

@@ -48,10 +48,7 @@ import org.schabi.newpipe.MainActivity.DEBUG
 import org.schabi.newpipe.R
 import org.schabi.newpipe.database.feed.model.FeedGroupEntity
 import org.schabi.newpipe.extractor.ListInfo
-import org.schabi.newpipe.extractor.exceptions.ContentNotAvailableException
-import org.schabi.newpipe.extractor.exceptions.ReCaptchaException
 import org.schabi.newpipe.extractor.stream.StreamInfoItem
-import org.schabi.newpipe.ktx.isNetworkRelated
 import org.schabi.newpipe.local.feed.FeedDatabaseManager
 import org.schabi.newpipe.local.feed.service.FeedEventManager.Event.ErrorResultEvent
 import org.schabi.newpipe.local.feed.service.FeedEventManager.Event.ProgressEvent
@@ -59,7 +56,6 @@ import org.schabi.newpipe.local.feed.service.FeedEventManager.Event.SuccessResul
 import org.schabi.newpipe.local.feed.service.FeedEventManager.postEvent
 import org.schabi.newpipe.local.subscription.SubscriptionManager
 import org.schabi.newpipe.util.ExtractorHelper
-import java.io.IOException
 import java.time.OffsetDateTime
 import java.time.ZoneOffset
 import java.util.concurrent.TimeUnit
@@ -163,7 +159,7 @@ class FeedLoadService : Service() {
     // Loading & Handling
     // /////////////////////////////////////////////////////////////////////////
 
-    public class RequestException(val subscriptionId: Long, message: String, cause: Throwable) : Exception(message, cause) {
+    class RequestException(val subscriptionId: Long, message: String, cause: Throwable) : Exception(message, cause) {
         companion object {
             fun wrapList(subscriptionId: Long, info: ListInfo<StreamInfoItem>): List<Throwable> {
                 val toReturn = ArrayList<Throwable>(info.errors.size)
@@ -210,29 +206,40 @@ class FeedLoadService : Service() {
             .filter { !cancelSignal.get() }
 
             .map { subscriptionEntity ->
+                var error: Throwable? = null
                 try {
                     val listInfo = if (useFeedExtractor) {
                         ExtractorHelper
                             .getFeedInfoFallbackToChannelInfo(subscriptionEntity.serviceId, subscriptionEntity.url)
+                            .onErrorReturn {
+                                error = it // store error, otherwise wrapped into RuntimeException
+                                throw it
+                            }
                             .blockingGet()
                     } else {
                         ExtractorHelper
                             .getChannelInfo(subscriptionEntity.serviceId, subscriptionEntity.url, true)
+                            .onErrorReturn {
+                                error = it // store error, otherwise wrapped into RuntimeException
+                                throw it
+                            }
                             .blockingGet()
                     } as ListInfo<StreamInfoItem>
 
                     return@map Notification.createOnNext(Pair(subscriptionEntity.uid, listInfo))
                 } catch (e: Throwable) {
+                    if (error == null) {
+                        // do this to prevent blockingGet() from wrapping into RuntimeException
+                        error = e
+                    }
+
                     val request = "${subscriptionEntity.serviceId}:${subscriptionEntity.url}"
-                    val wrapper = RequestException(subscriptionEntity.uid, request, e)
+                    val wrapper = RequestException(subscriptionEntity.uid, request, error!!)
                     return@map Notification.createOnError<Pair<Long, ListInfo<StreamInfoItem>>>(wrapper)
                 }
             }
             .sequential()
 
-            .observeOn(AndroidSchedulers.mainThread())
-            .doOnNext(errorHandlingConsumer)
-
             .observeOn(AndroidSchedulers.mainThread())
             .doOnNext(notificationsConsumer)
 
@@ -332,38 +339,6 @@ class FeedLoadService : Service() {
             }
         }
 
-    private val errorHandlingConsumer: Consumer<Notification<Pair<Long, ListInfo<StreamInfoItem>>>>
-        get() = Consumer {
-            if (it.isOnError) {
-                var maybeWrapper = it.error!!
-                val error = if (maybeWrapper is RequestException) maybeWrapper.cause!!
-                else maybeWrapper
-                val cause = error.cause
-
-                when {
-                    error is ReCaptchaException -> throw error
-                    cause is ReCaptchaException -> throw cause
-
-                    error is IOException -> throw error
-                    cause is IOException -> throw cause
-                    error.isNetworkRelated -> throw IOException(error)
-
-                    cause is ContentNotAvailableException -> {
-                        // maybeWrapper is definitely a RequestException,
-                        // because this is an exception thrown in the extractor
-                        if (maybeWrapper is RequestException) {
-                            throw maybeWrapper
-                        } else {
-                            if (DEBUG) {
-                                Log.d(TAG, "Cause is ContentNotAvailableException, but maybeWrapper is not a RequestException")
-                            }
-                            throw cause // should never be the case
-                        }
-                    }
-                }
-            }
-        }
-
     private val notificationsConsumer: Consumer<Notification<Pair<Long, ListInfo<StreamInfoItem>>>>
         get() = Consumer { onItemCompleted(it.value?.second?.name) }