Use extension list fallback if extensions fail to fetch (#469)

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/ExtensionsList.kt

@@ -22,6 +22,7 @@ import suwayomi.tachidesk.manga.impl.extension.github.OnlineExtension
 import suwayomi.tachidesk.manga.model.dataclass.ExtensionDataClass
 import suwayomi.tachidesk.manga.model.table.ExtensionTable
 import java.util.concurrent.ConcurrentHashMap
+import kotlin.time.Duration.Companion.seconds
 
 object ExtensionsList {
     private val logger = KotlinLogging.logger {}
@@ -29,12 +30,9 @@ object ExtensionsList {
     var lastUpdateCheck: Long = 0
     var updateMap = ConcurrentHashMap<String, OnlineExtension>()
 
-    /** 60,000 milliseconds = 60 seconds */
-    private const val ExtensionUpdateDelayTime = 60 * 1000
-
     suspend fun getExtensionList(): List<ExtensionDataClass> {
-        // update if {ExtensionUpdateDelayTime} seconds has passed or requested offline and database is empty
+        // update if 60 seconds has passed or requested offline and database is empty
-        if (lastUpdateCheck + ExtensionUpdateDelayTime < System.currentTimeMillis()) {
+        if (lastUpdateCheck + 60.seconds.inWholeMilliseconds < System.currentTimeMillis()) {
             logger.debug("Getting extensions list from the internet")
             lastUpdateCheck = System.currentTimeMillis()
 
@@ -80,14 +78,14 @@ object ExtensionsList {
                                 updateMap.putIfAbsent(foundExtension.pkgName, foundExtension)
                             }
                             foundExtension.versionCode < extensionRecord[ExtensionTable.versionCode] -> {
-                                // some how the user installed an invalid version
+                                // somehow the user installed an invalid version
                                 ExtensionTable.update({ ExtensionTable.pkgName eq foundExtension.pkgName }) {
                                     it[isObsolete] = true
                                 }
                             }
                         }
                     } else {
-                        // extension is not installed so we can overwrite the data without a care
+                        // extension is not installed, so we can overwrite the data without a care
                         ExtensionTable.update({ ExtensionTable.pkgName eq foundExtension.pkgName }) {
                             it[name] = foundExtension.name
                             it[versionName] = foundExtension.versionName
@@ -117,14 +115,14 @@ object ExtensionsList {
             ExtensionTable.selectAll().forEach { extensionRecord ->
                 val foundExtension = foundExtensions.find { it.pkgName == extensionRecord[ExtensionTable.pkgName] }
                 if (foundExtension == null) {
-                    // not in the repo, so this extensions is obsolete
+                    // not in the repo, so these extensions are obsolete
                     if (extensionRecord[ExtensionTable.isInstalled]) {
                         // is installed so we should mark it as obsolete
                         ExtensionTable.update({ ExtensionTable.pkgName eq extensionRecord[ExtensionTable.pkgName] }) {
                             it[isObsolete] = true
                         }
                     } else {
-                        // is not installed so we can remove the record without a care
+                        // is not installed, so we can remove the record without a care
                         ExtensionTable.deleteWhere { ExtensionTable.pkgName eq extensionRecord[ExtensionTable.pkgName] }
                     }
                 }

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/github/ExtensionGithubApi.kt

@@ -7,11 +7,12 @@ package suwayomi.tachidesk.manga.impl.extension.github
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.await
 import eu.kanade.tachiyomi.network.parseAs
 import kotlinx.serialization.Serializable
-import okhttp3.Request
+import mu.KotlinLogging
 import suwayomi.tachidesk.manga.impl.util.PackageTools.LIB_VERSION_MAX
 import suwayomi.tachidesk.manga.impl.util.PackageTools.LIB_VERSION_MIN
 import suwayomi.tachidesk.manga.model.dataclass.ExtensionDataClass
@@ -19,6 +20,8 @@ import uy.kohesive.injekt.injectLazy
 
 object ExtensionGithubApi {
     private const val REPO_URL_PREFIX = "https://raw.githubusercontent.com/tachiyomiorg/tachiyomi-extensions/repo/"
+    private const val FALLBACK_REPO_URL_PREFIX = "https://gcore.jsdelivr.net/gh/tachiyomiorg/tachiyomi-extensions@repo/"
+    private val logger = KotlinLogging.logger {}
 
     @Serializable
     private data class ExtensionJsonObject(
@@ -42,13 +45,26 @@ object ExtensionGithubApi {
         val baseUrl: String
     )
 
-    suspend fun findExtensions(): List<OnlineExtension> {
+    private var requiresFallbackSource = false
-        val request = Request.Builder()
-            .url("$REPO_URL_PREFIX/index.min.json")
-            .build()
 
-        return client.newCall(request)
+    suspend fun findExtensions(): List<OnlineExtension> {
-            .await()
+        val githubResponse = if (requiresFallbackSource) {
+            null
+        } else {
+            try {
+                client.newCall(GET("${REPO_URL_PREFIX}index.min.json")).await()
+            } catch (e: Throwable) {
+                logger.error(e) { "Failed to get extensions from GitHub" }
+                requiresFallbackSource = true
+                null
+            }
+        }
+
+        val response = githubResponse ?: run {
+            client.newCall(GET("${FALLBACK_REPO_URL_PREFIX}index.min.json")).await()
+        }
+
+        return response
             .parseAs<List<ExtensionJsonObject>>()
             .toExtensions()
     }