Review extensions

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/MiraiConsoleImplementation.kt

@@ -30,6 +30,7 @@ import java.util.*
 import java.util.concurrent.locks.ReentrantLock
 import kotlin.annotation.AnnotationTarget.*
 import kotlin.coroutines.CoroutineContext
+import kotlin.system.exitProcess
 
 
 /**
@@ -176,7 +177,7 @@ public interface MiraiConsoleImplementation : CoroutineScope {
         /**
          * 可由前端调用, 获取当前的 [MiraiConsoleImplementation] 实例
          *
-         * 必须在 [start] 之后才能使用.
+         * 必须在 [start] 之后才能使用, 否则抛出 [UninitializedPropertyAccessException]
          */
         @JvmStatic
         @ConsoleFrontEndImplementation
@@ -189,7 +190,22 @@ public interface MiraiConsoleImplementation : CoroutineScope {
         public fun MiraiConsoleImplementation.start(): Unit = initLock.withLock {
             if (::instance.isInitialized) error("Mirai Console is already initialized.")
             this@Companion.instance = this
-            MiraiConsoleImplementationBridge.doStart()
+            kotlin.runCatching {
+                MiraiConsoleImplementationBridge.doStart()
+            }.onFailure { e ->
+                kotlin.runCatching {
+                    MiraiConsole.mainLogger.error("Failed to init MiraiConsole.", e)
+                }.onFailure {
+                    e.printStackTrace()
+                }
+
+                kotlin.runCatching {
+                    MiraiConsole.cancel()
+                }.onFailure {
+                    it.printStackTrace()
+                }
+                exitProcess(1)
+            }
         }
     }
 }

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extension/PluginComponentStorage.kt

@@ -56,6 +56,7 @@ public class PluginComponentStorage(
     public fun contributeSingletonExtensionSelector(lazyInstance: () -> SingletonExtensionSelector): Unit =
         contribute(SingletonExtensionSelector, plugin, lazyInstance)
 
+    @Suppress("SpellCheckingInspection") // alterer
     /** 注册一个 [BotConfigurationAlterer] */
     public fun contributeBotConfigurationAlterer(instance: BotConfigurationAlterer): Unit =
         contribute(BotConfigurationAlterer, plugin, lazyInstance = { instance })

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/BotConfigurationAlterer.kt

@@ -21,6 +21,7 @@ import net.mamoe.mirai.utils.BotConfiguration
  *
  * @see MiraiConsole.addBot
  */
+@Suppress("SpellCheckingInspection") // alterer
 public fun interface BotConfigurationAlterer : FunctionExtension {
 
     /**

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PluginLoaderProvider.kt

@@ -12,12 +12,19 @@ package net.mamoe.mirai.console.extensions
 import net.mamoe.mirai.console.extension.AbstractExtensionPoint
 import net.mamoe.mirai.console.extension.Extension
 import net.mamoe.mirai.console.extension.InstanceExtension
+import net.mamoe.mirai.console.extension.PluginComponentStorage
 import net.mamoe.mirai.console.plugin.loader.PluginLoader
 
 /**
  * 提供扩展 [PluginLoader]
  *
+ * @see PluginComponentStorage.contributePluginLoader
+ *
+ *
  * @see Extension
+ * @see PluginLoader
+ *
+ * @see LazyPluginLoaderProviderImpl
  */
 public interface PluginLoaderProvider : InstanceExtension<PluginLoader<*, *>> {
     public companion object ExtensionPoint : AbstractExtensionPoint<PluginLoaderProvider>(PluginLoaderProvider::class)

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/extensions/PostStartupExtension.kt

@@ -9,8 +9,11 @@
 
 package net.mamoe.mirai.console.extensions
 
+import net.mamoe.mirai.console.MiraiConsole
 import net.mamoe.mirai.console.extension.AbstractExtensionPoint
+import net.mamoe.mirai.console.extension.ExtensionException
 import net.mamoe.mirai.console.extension.FunctionExtension
+import net.mamoe.mirai.console.internal.MiraiConsoleImplementationBridge
 
 /**
  * 在 Console 启动完成后立即在主线程调用的扩展. 用于进行一些必要的延迟初始化.
@@ -20,7 +23,13 @@ import net.mamoe.mirai.console.extension.FunctionExtension
 public fun interface PostStartupExtension : FunctionExtension {
     /**
      * 将在 Console 主线程执行.
+     *
+     * @throws Exception 所有抛出的 [Exception] 都会被捕获并包装为 [ExtensionException] 抛出, 并停止 [MiraiConsole]
+     *
+     * #### 内部实现细节
+     * 在 [MiraiConsoleImplementationBridge.doStart] 所有 [MiraiConsoleImplementationBridge.phase] 执行完成后顺序调用.
      */
+    @Throws(Exception::class)
     public operator fun invoke()
 
     public companion object ExtensionPoint : AbstractExtensionPoint<PostStartupExtension>(PostStartupExtension::class)

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/MiraiConsoleImplementationBridge.kt

@@ -217,7 +217,7 @@ internal object MiraiConsoleImplementationBridge : CoroutineScope, MiraiConsoleI
         }
 
         GlobalComponentStorage.run {
-            PostStartupExtension.useExtensions { it() }
+            PostStartupExtension.useExtensions { it() } // exceptions thrown will be caught by caller of `doStart`.
         }
 
         mainLogger.info { "mirai-console started successfully." }

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/loader/PluginLoader.kt

@@ -37,6 +37,7 @@ import net.mamoe.mirai.console.plugin.jvm.JvmPluginLoader
  * 直接实现接口 [PluginLoader] 或 [FilePluginLoader], 并注册 [PluginLoaderProvider]
  *
  * @see JvmPluginLoader Jar 插件加载器
+ * @see PluginLoaderProvider 扩展
  */
 public interface PluginLoader<P : Plugin, D : PluginDescription> {
     /**