fix(#4): detail exceptions handling

Author: Samarium150

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
 }
 
 group = "com.github.samarium150"
-version = "1.4"
+version = "1.4.1"
 
 repositories {
     mavenLocal()

src/main/kotlin/APIError.kt

@@ -0,0 +1,37 @@
+package com.github.samarium150.mirai.plugin
+
+/**
+ * Class representation for handling Lolicon API error
+ *
+ * @property code [Int] Error code
+ * @property message [String] Error message
+ * @constructor
+ */
+class APIError internal constructor(
+    private val code: Int,
+    override val message: String
+): Exception(message) {
+
+    /**
+     * Override toString() for logging
+     *
+     * @return [String]
+     */
+    override fun toString(): String {
+        return "[${code}: ${message}]"
+    }
+
+    /**
+     * Return the readable information
+     *
+     * @return [String]
+     */
+    fun toReadable(): String {
+        return when (code) {
+            -1, 401 -> message
+            403 -> "调用不规范, 用户两行泪. 快去找开发者的麻烦."
+            404 -> "没有找到相关图片, 换个关键词试试吧"
+            else -> throw Exception(this.toString())
+        }
+    }
+}

src/main/kotlin/Lolicon.kt

@@ -1,5 +1,6 @@
 package com.github.samarium150.mirai.plugin
 
+import com.github.kittinunf.fuel.core.FuelError
 import kotlinx.coroutines.*
 import kotlinx.io.errors.IOException
 import net.mamoe.mirai.Mirai
@@ -125,6 +126,12 @@ object Lolicon: CompositeCommand(
                 @Suppress("BlockingMethodInNonBlockingContext")
                 withContext(Dispatchers.IO) { try { stream.close() } catch (e: IOException) {} }
             }
+        } catch (fe: FuelError) {
+            Main.logger.warning(fe.toString())
+            sendMessage("网络连接失败或图片已被删除，之后再试试吧")
+        } catch (ae: APIError) {
+            Main.logger.warning(ae.toString())
+            sendMessage(ae.toReadable())
         } catch (e: Exception) {
             Main.logger.error(e)
         }

src/main/kotlin/Main.kt

@@ -26,7 +26,7 @@ import net.mamoe.mirai.utils.info
 object Main: KotlinPlugin(
     JvmPluginDescription(
         id = "com.github.samarium150.mirai-console-lolicon",
-        version = "1.4",
+        version = "1.4.1",
         name = "mirai-console-lolicon"
     )
 ) {

src/main/kotlin/RequestHandler.kt

@@ -34,7 +34,7 @@ object RequestHandler {
         val (_, response, result) = getResponse(url)
         if (result is Result.Failure) throw result.getException()
         val feedback: Response = gson.fromJson(String(response.data), Response::class.java)
-        if (feedback.code != 0) throw Exception(feedback.msg)
+        if (feedback.code != 0) throw APIError(feedback.code, feedback.msg)
         return feedback
     }