feat(yogurt): provide more human-readable error msg

Author: Wesley-Young

yogurt/src/commonMain/kotlin/org/ntqqrev/yogurt/Initialization.kt

@@ -1,5 +1,7 @@
 package org.ntqqrev.yogurt
 
+import com.github.ajalt.mordant.platform.MultiplatformSystem.exitProcess
+import com.github.ajalt.mordant.rendering.TextColors
 import io.ktor.server.application.*
 import io.ktor.server.plugins.di.*
 import kotlinx.coroutines.flow.*
@@ -17,6 +19,7 @@ import org.ntqqrev.acidify.common.android.AndroidSessionStore
 import org.ntqqrev.acidify.common.android.AndroidSignProvider
 import org.ntqqrev.acidify.common.android.AndroidUrlSignProvider
 import org.ntqqrev.acidify.exception.UnstableNetworkException
+import org.ntqqrev.acidify.exception.WtLoginException
 import org.ntqqrev.milky.Event
 import org.ntqqrev.yogurt.YogurtApp.config
 import org.ntqqrev.yogurt.YogurtApp.t
@@ -177,6 +180,8 @@ suspend fun Application.botLogin() {
                 t.println(e.manualVerifyUrl)
                 readln()
                 botLogin()
+            } catch (e: WtLoginException) {
+                t.println(TextColors.red("${e.tag} (code=${e.code})：${e.msg}"))
             }
         }
     }

yogurt/src/commonMain/kotlin/org/ntqqrev/yogurt/Main.kt

@@ -2,17 +2,36 @@
 
 package org.ntqqrev.yogurt
 
+import com.github.ajalt.mordant.platform.MultiplatformSystem.exitProcess
+import com.github.ajalt.mordant.rendering.TextColors
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.runBlocking
+import org.ntqqrev.yogurt.YogurtApp.config
+import org.ntqqrev.yogurt.YogurtApp.t
+import org.ntqqrev.yogurt.util.isCausedByAddrInUse
 import kotlin.jvm.JvmName
 
 fun main() {
     val server = YogurtApp.createServer()
-    server.start(wait = false)
-    server.onSigint {
-        server.stop(gracePeriodMillis = 2000L, timeoutMillis = 5000L)
-    }
-    runBlocking {
-        delay(Long.MAX_VALUE)
+    try {
+        server.start(wait = false)
+        server.onSigint {
+            server.stop(gracePeriodMillis = 2000L, timeoutMillis = 5000L)
+        }
+        runBlocking {
+            delay(Long.MAX_VALUE)
+        }
+    } catch (e: Throwable) {
+        if (e.isCausedByAddrInUse()) {
+            t.println(
+                TextColors.red(
+                    """
+                        无法启动服务器，可能是 ${config.httpConfig.host}:${config.httpConfig.port} 已被占用。
+                        请检查是否有其他程序正在使用该地址，或者修改配置文件中的 host 和 port 后重试。
+                    """.trimIndent()
+                )
+            )
+        }
+        throw e
     }
 }

yogurt/src/commonMain/kotlin/org/ntqqrev/yogurt/util/ErrorUtils.kt

@@ -0,0 +1,3 @@
+package org.ntqqrev.yogurt.util
+
+expect fun Throwable.isCausedByAddrInUse(): Boolean

yogurt/src/jvmMain/kotlin/org/ntqqrev/yogurt/util/ErrorUtils.jvm.kt

@@ -0,0 +1,8 @@
+package org.ntqqrev.yogurt.util
+
+actual tailrec fun Throwable.isCausedByAddrInUse(): Boolean {
+    if (this is java.net.BindException) {
+        return true
+    }
+    return cause?.isCausedByAddrInUse() ?: false
+}

yogurt/src/nativeMain/kotlin/org/ntqqrev/yogurt/util/ErrorUtils.native.kt

@@ -0,0 +1,18 @@
+package org.ntqqrev.yogurt.util
+
+import io.ktor.utils.io.errors.PosixException
+
+val addrInUsePosixCodes = setOf(
+    48, // macOS - EADDRINUSE
+    98, // Linux - EADDRINUSE
+    10048, // Windows - WSAEADDRINUSE
+)
+
+actual tailrec fun Throwable.isCausedByAddrInUse(): Boolean {
+    if (this is PosixException.PosixErrnoException) {
+        if (errno in addrInUsePosixCodes) {
+            return true
+        }
+    }
+    return cause?.isCausedByAddrInUse() ?: false
+}