Fix crash of metadata not available

app/src/main/java/com/hippo/ehviewer/gallery/ArchivePageLoader.java

@@ -46,9 +46,7 @@ import java.util.Set;
 import java.util.Stack;
 import java.util.concurrent.atomic.AtomicInteger;
 
-import eu.kanade.tachiyomi.ui.reader.loader.PageLoader;
 import kotlin.Pair;
-import kotlin.Unit;
 import kotlin.coroutines.Continuation;
 import kotlin.coroutines.intrinsics.CoroutineSingletons;
 
@@ -191,11 +189,11 @@ public class ArchivePageLoader extends PageLoader2 {
 
     }
 
-    private Continuation<? super Unit> continuation = null;
+    private Continuation<? super Boolean> continuation = null;
 
     @Nullable
     @Override
-    public Object awaitReady(@NonNull Continuation<? super Unit> $completion) {
+    public Object awaitReady(@NonNull Continuation<? super Boolean> $completion) {
         continuation = $completion;
         return CoroutineSingletons.COROUTINE_SUSPENDED;
     }

app/src/main/java/com/hippo/ehviewer/gallery/EhPageLoader.kt

@@ -97,8 +97,8 @@ class EhPageLoader(private val mGalleryInfo: GalleryInfo) : PageLoader2(), OnSpi
         mSpiderQueen.forceRequest(index)
     }
 
-    override suspend fun awaitReady() {
-        mSpiderQueen.awaitReady()
+    override suspend fun awaitReady(): Boolean {
+        return mSpiderQueen.awaitReady()
     }
 
     override fun onCancelRequest(index: Int) {

app/src/main/java/com/hippo/ehviewer/spider/SpiderQueen.kt

@@ -212,10 +212,6 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
             MODE_DOWNLOAD -> mDownloadReference++
         }
         check(mDownloadReference <= 1) { "mDownloadReference can't more than 0" }
-        launchIO {
-            prepareJob.join()
-            updateMode()
-        }
     }
 
     private fun clearMode(@Mode mode: Int) {
@@ -224,10 +220,6 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
             MODE_DOWNLOAD -> mDownloadReference--
         }
         check(!(mReadReference < 0 || mDownloadReference < 0)) { "Mode reference < 0" }
-        launchIO {
-            prepareJob.join()
-            updateMode()
-        }
     }
 
     private val prepareJob = launchIO { doPrepare() }
@@ -436,6 +428,7 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
 
     @Synchronized
     private fun writeSpiderInfoToLocal() {
+        if (!isReady) return
         mSpiderDen.downloadDir?.run { createFile(SPIDER_INFO_FILENAME).also { mSpiderInfo.write(it) } }
         mSpiderInfo.saveToCache()
     }
@@ -513,17 +506,23 @@ class SpiderQueen private constructor(val galleryInfo: GalleryInfo) : CoroutineS
 
         @JvmStatic
         fun obtainSpiderQueen(galleryInfo: GalleryInfo, @Mode mode: Int): SpiderQueen {
-            return sQueenMap[galleryInfo.gid]?.apply { setMode(mode) }
-                ?: SpiderQueen(galleryInfo).apply { setMode(mode) }
-                    .also { sQueenMap[galleryInfo.gid] = it }
+            val gid = galleryInfo.gid
+            return (sQueenMap[gid] ?: SpiderQueen(galleryInfo).also { sQueenMap[gid] = it }).apply {
+                setMode(mode)
+                launchIO { if (awaitReady()) updateMode() }
+            }
         }
 
         @JvmStatic
         fun releaseSpiderQueen(queen: SpiderQueen, @Mode mode: Int) {
-            queen.clearMode(mode)
-            if (queen.mReadReference == 0 && queen.mDownloadReference == 0) {
-                queen.stop()
-                sQueenMap.remove(queen.galleryInfo.gid)
+            queen.run {
+                clearMode(mode)
+                if (mReadReference == 0 && mDownloadReference == 0) {
+                    stop()
+                    sQueenMap.remove(galleryInfo.gid)
+                } else {
+                    launchIO { if (awaitReady()) updateMode() }
+                }
             }
         }
     }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -271,8 +271,7 @@ class ReaderActivity : EhActivity() {
         mGalleryProvider!!.start()
 
         lifecycleScope.launchUI {
-            mGalleryProvider!!.awaitReady()
-            setGallery()
+            if (mGalleryProvider!!.awaitReady()) setGallery()
         }
 
         config = ReaderConfig()

app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/PageLoader.kt

@@ -18,7 +18,7 @@ abstract class PageLoader {
 
     private val mPreloads = MathUtils.clamp(com.hippo.ehviewer.Settings.getPreloadImage(), 0, 100)
 
-    abstract suspend fun awaitReady()
+    abstract suspend fun awaitReady(): Boolean
 
     abstract fun start()