Fix reconnection on Heartbeat timeout: add PacketTimeoutException

mirai-core/src/commonMain/kotlin/network/components/HeartbeatScheduler.kt

@@ -14,6 +14,7 @@ import net.mamoe.mirai.internal.network.component.ComponentKey
 import net.mamoe.mirai.internal.network.component.ComponentStorage
 import net.mamoe.mirai.internal.network.context.SsoProcessorContext
 import net.mamoe.mirai.internal.network.handler.NetworkHandlerSupport
+import net.mamoe.mirai.internal.network.handler.selector.PacketTimeoutException
 import net.mamoe.mirai.utils.BotConfiguration.HeartbeatStrategy.*
 import net.mamoe.mirai.utils.MiraiLogger
 import net.mamoe.mirai.utils.info
@@ -101,11 +102,11 @@ internal class TimeBasedHeartbeatSchedulerImpl(
                 }
 
                 try {
-                    withTimeoutOrNull(timeout()) {
+                    withTimeout(timeout()) {
                         action()
-                    } ?: error("Timeout $name.")
+                    }
                 } catch (e: Throwable) {
-                    onHeartFailure(name, e)
+                    onHeartFailure(name, PacketTimeoutException("Timeout receiving Heartbeat response", e))
                 }
             }
         }.apply {

mirai-core/src/commonMain/kotlin/network/handler/selector/PacketTimeoutException.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2019-2021 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/dev/LICENSE
+ */
+
+package net.mamoe.mirai.internal.network.handler.selector
+
+internal data class PacketTimeoutException(
+    override val message: String,
+    override val cause: Throwable? = null,
+) : NetworkException(true)

mirai-core/src/commonMain/kotlin/network/impl/netty/HeartbeatFailedException.kt

@@ -10,7 +10,6 @@
 package net.mamoe.mirai.internal.network.impl.netty
 
 import net.mamoe.mirai.internal.network.handler.selector.NetworkException
-import net.mamoe.mirai.utils.unwrap
 import net.mamoe.mirai.utils.unwrapCancellationException
 import java.io.IOException