[Grouple] Fix pages url extraction

src/main/kotlin/org/koitharu/kotatsu/parsers/site/grouple/GroupleParser.kt

@@ -1,9 +1,11 @@
 package org.koitharu.kotatsu.parsers.site.grouple
 
-import kotlinx.coroutines.async
-import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.flow.channelFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
 import okhttp3.Headers
 import okhttp3.HttpUrl.Companion.toHttpUrl
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import okhttp3.Interceptor
 import okhttp3.Response
 import okhttp3.internal.headersContentLength
@@ -236,30 +238,42 @@ internal abstract class GroupleParser(
 
 	override suspend fun getPageUrl(page: MangaPage): String {
 		val parts = page.url.split('|')
+		if (parts.size < 2) {
+			throw ParseException("No servers found for page", page.url)
+		}
 		val path = parts.last()
-		val servers = parts.dropLast(1).toSet()
-		val cachedServer = cachedPagesServer
-		if (!cachedServer.isNullOrEmpty() && cachedServer in servers && tryHead(concatUrl(cachedServer, path))) {
-			return concatUrl(cachedServer, path)
+		// fast path
+		cachedPagesServer?.let { host ->
+			val url = concatUrl("https://$host/", path)
+			if (tryHead(url)) {
+				return url
+			} else {
+				cachedPagesServer = null
+			}
 		}
-		if (servers.isEmpty()) {
-			throw ParseException("No servers found for page", page.url)
+		// slow path
+		val candidates = HashSet<String>((parts.size - 1) * 2)
+		for (i in 0 until parts.size - 1) {
+			val server = parts[i].trim().ifEmpty { "https://$domain/" }
+			candidates.add(concatUrl(server, path))
+			candidates.add(concatUrl(server, path.substringBeforeLast('?')))
 		}
-		val server = try {
-			coroutineScope {
-				servers.map { server ->
-					async {
-						val host = server.trim().ifEmpty { "https://$domain/" }
-						if (tryHead(concatUrl(host, path))) host else null
+		return try {
+			channelFlow {
+				for (url in candidates) {
+					launch {
+						if (tryHead(url)) {
+							send(url)
+						}
 					}
-				}.awaitFirst { it != null }
-			}.also {
-				cachedPagesServer = it
+				}
+			}.first().also {
+				cachedPagesServer = it.toHttpUrlOrNull()?.host
 			}
 		} catch (e: NoSuchElementException) {
-			servers.random()
+			assert(false) { e.toString() }
+			candidates.random()
 		}
-		return concatUrl(checkNotNull(server).ifEmpty { "https://$domain/" }, path)
 	}
 
 	override suspend fun getTags(): Set<MangaTag> {

src/main/kotlin/org/koitharu/kotatsu/parsers/util/Coroutines.kt

@@ -2,39 +2,34 @@ package org.koitharu.kotatsu.parsers.util
 
 import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.selects.select
+import kotlinx.coroutines.flow.channelFlow
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
 import kotlin.coroutines.cancellation.CancellationException
 
 fun Iterable<Job>.cancelAll(cause: CancellationException? = null) {
 	forEach { it.cancel(cause) }
 }
 
-suspend fun <T> Iterable<Deferred<T>>.awaitFirst(): T = select<T> {
-	for (async in this@awaitFirst) {
-		async.onAwait { it }
-	}
-}.also { this@awaitFirst.cancelAll() }
+suspend fun <T> Iterable<Deferred<T>>.awaitFirst(): T {
+	return channelFlow {
+		for (deferred in this@awaitFirst) {
+			launch {
+				send(deferred.await())
+			}
+		}
+	}.first().also { this@awaitFirst.cancelAll() }
+}
 
 suspend fun <T> Collection<Deferred<T>>.awaitFirst(condition: (T) -> Boolean): T {
-	var result: Any? = NULL
-	var counter = size
-	while (result === NULL && counter > 0) {
-		val candidate = select<T> {
-			for (async in this@awaitFirst) {
-				async.onAwait { it }
+	return channelFlow {
+		for (deferred in this@awaitFirst) {
+			launch {
+				val result = deferred.await()
+				if (condition(result)) {
+					send(result)
+				}
 			}
 		}
-		if (condition(candidate)) {
-			result = candidate
-		}
-		counter--
-	}
-	cancelAll()
-	if (result === NULL) {
-		throw NoSuchElementException()
-	}
-	@Suppress("UNCHECKED_CAST")
-	return result as T
+	}.first().also { this@awaitFirst.cancelAll() }
 }
-
-private val NULL = Any()

src/test/kotlin/org/koitharu/kotatsu/parsers/MangaParserTest.kt

@@ -114,20 +114,24 @@ internal class MangaParserTest {
 	@MangaSources
 	fun pages(source: MangaSource) = runTest {
 		val parser = source.newParser(context)
-		val list = parser.getList(0, sortOrder = SortOrder.POPULARITY, tags = null)
+		val list = parser.getList(0, sortOrder = SortOrder.UPDATED, tags = null)
 		val manga = list.first()
-		val chapter = parser.getDetails(manga).chapters?.firstOrNull() ?: error("Chapter is null")
+		val chapter = parser.getDetails(manga).chapters?.firstOrNull() ?: error("Chapter is null at ${manga.publicUrl}")
 		val pages = parser.getPages(chapter)
 
 		assert(pages.isNotEmpty())
 		assert(pages.isDistinctBy { it.id })
 		assert(pages.all { it.source == source })
 
-		val page = pages.medianOrNull() ?: error("No page")
-		val pageUrl = parser.getPageUrl(page)
-		assert(pageUrl.isNotEmpty())
-		assert(pageUrl.isUrlAbsolute())
-		checkImageRequest(pageUrl, page.source)
+		arrayOf(
+			pages.first(),
+			pages.medianOrNull() ?: error("No page"),
+		).forEach { page ->
+			val pageUrl = parser.getPageUrl(page)
+			assert(pageUrl.isNotEmpty())
+			assert(pageUrl.isUrlAbsolute())
+			checkImageRequest(pageUrl, page.source)
+		}
 	}
 
 	@ParameterizedTest(name = "{index}|favicon|{0}")