[YS-155] refact: 예외 핸들링 로직 수정 및 500 에러 디스코드 웹훅 알림 추가 (#37)

* feat: implement Discord error alarm notification feature

* refact: delete unused file

* chore: add discord env

* chore: add discord env in test yml

* refact: rename request dto name

* style: delete unused import

src/main/kotlin/com/dobby/backend/domain/exception/DomainException.kt

@@ -1,9 +1,6 @@
 package com.dobby.backend.domain.exception
 
-import org.springframework.http.HttpStatus
-
 open class DomainException(
     val errorCode: ErrorCode,
     val data: Any? = null,
 ) : RuntimeException(errorCode.message)
-

src/main/kotlin/com/dobby/backend/domain/gateway/AlertGateway.kt

@@ -0,0 +1,7 @@
+package com.dobby.backend.domain.gateway
+
+import jakarta.servlet.http.HttpServletRequest
+
+interface AlertGateway {
+    fun sendError(e: Exception, request: HttpServletRequest)
+}

src/main/kotlin/com/dobby/backend/infrastructure/feign/discord/DiscordFeignClient.kt

@@ -0,0 +1,17 @@
+package com.dobby.backend.infrastructure.feign.discord
+
+import com.dobby.backend.presentation.api.dto.request.DiscordMessageRequest
+import org.springframework.cloud.openfeign.FeignClient
+import org.springframework.http.MediaType
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+
+@FeignClient(
+    name = "discord-alarm-feign-client",
+    url = "\${discord.webhook-url}"
+)
+interface DiscordFeignClient {
+
+    @PostMapping(produces = [MediaType.APPLICATION_JSON_VALUE])
+    fun sendMessage(@RequestBody discordMessageRequest: DiscordMessageRequest)
+}

src/main/kotlin/com/dobby/backend/infrastructure/gateway/discord/AlertGatewayImpl.kt

@@ -0,0 +1,64 @@
+package com.dobby.backend.infrastructure.gateway.discord
+
+import com.dobby.backend.domain.gateway.AlertGateway
+import com.dobby.backend.infrastructure.feign.discord.DiscordFeignClient
+import com.dobby.backend.presentation.api.dto.request.DiscordMessageRequest
+import jakarta.servlet.http.HttpServletRequest
+import org.springframework.stereotype.Component
+import java.io.PrintWriter
+import java.io.StringWriter
+import java.time.LocalDateTime
+
+@Component
+class AlertGatewayImpl(
+    private val discordFeignClient: DiscordFeignClient
+): AlertGateway {
+
+    override fun sendError(e: Exception, request: HttpServletRequest) {
+        sendMessage(createMessage(e, request))
+    }
+
+    private fun createMessage(e: Exception, request: HttpServletRequest): DiscordMessageRequest {
+        return DiscordMessageRequest(
+            content = "# 🚨 에러 발생 비이이이이사아아아앙",
+            embeds = listOf(
+                DiscordMessageRequest.Embed(
+                    title = "ℹ️ 에러 정보",
+                    description = """
+                        ### 🕖 발생 시간
+                        ${LocalDateTime.now()}
+                        
+                        ### 🔗 요청 URL
+                        ${createRequestFullPath(request)}
+                        
+                        ### 📄 Stack Trace
+                        ```
+                        ${getStackTrace(e).substring(0, 1000)}
+                        ```
+                    """.trimIndent()
+                )
+            )
+        )
+    }
+
+    private fun createRequestFullPath(request: HttpServletRequest): String {
+        var fullPath = "${request.method} ${request.requestURL}"
+
+        val queryString = request.queryString
+        if (queryString != null) {
+            fullPath += "?$queryString"
+        }
+
+        return fullPath
+    }
+
+    private fun getStackTrace(e: Exception): String {
+        val stringWriter = StringWriter()
+        e.printStackTrace(PrintWriter(stringWriter))
+        return stringWriter.toString()
+    }
+
+    private fun sendMessage(request: DiscordMessageRequest) {
+        discordFeignClient.sendMessage(request)
+    }
+}

src/main/kotlin/com/dobby/backend/presentation/api/config/WebExceptionHandler.kt

@@ -1,9 +1,12 @@
 package com.dobby.backend.presentation.api.config
 
 import com.dobby.backend.domain.exception.*
+import com.dobby.backend.domain.gateway.AlertGateway
 import com.dobby.backend.presentation.api.dto.response.ErrorResponse
 import jakarta.servlet.http.HttpServletRequest
 import jakarta.validation.ConstraintViolationException
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 import org.springframework.http.HttpStatus
 import org.springframework.http.ResponseEntity
 import org.springframework.http.converter.HttpMessageNotReadableException
@@ -18,7 +21,10 @@ import org.springframework.web.util.BindErrorUtils
 import java.security.InvalidParameterException
 
 @RestControllerAdvice
-class WebExceptionHandler {
+class WebExceptionHandler(
+    private val alertGateway: AlertGateway
+) {
+    private val logger: Logger = LoggerFactory.getLogger(WebExceptionHandler::class.java)
 
     @ExceptionHandler(value = [DomainException::class])
     fun handleDomainException(
@@ -94,6 +100,18 @@ class WebExceptionHandler {
             )
     }
 
+    @ExceptionHandler(value = [Throwable::class])
+    fun handleUnhandledException(
+        exception: Exception,
+        request: HttpServletRequest
+    ): ResponseEntity<ErrorResponse> {
+        alertGateway.sendError(exception, request)
+        logger.error("[UnhandledException] " + exception.stackTraceToString())
+        return ResponseEntity
+            .status(HttpStatus.INTERNAL_SERVER_ERROR)
+            .body(ErrorResponse.fromErrorCode(ErrorCode.UNKNOWN_SERVER_ERROR))
+    }
+
     @ExceptionHandler(value = [AuthenticationException::class])
     fun handleAuthenticationException(
         exception: AuthenticationException,

src/main/kotlin/com/dobby/backend/presentation/api/dto/request/DiscordMessageRequest.kt

@@ -0,0 +1,12 @@
+package com.dobby.backend.presentation.api.dto.request
+
+data class DiscordMessageRequest(
+    val content: String? = null,
+    val embeds: List<Embed>? = null
+) {
+
+    data class Embed(
+        val title: String? = null,
+        val description: String? = null
+    )
+}

src/main/resources/application.yml

@@ -70,4 +70,7 @@ cloud:
       static: ${S3_REGION}
     credentials:
       access-key: ${S3_ACCESS_KEY}
-      secret-key: ${S3_SECRET_KEY}
+      secret-key: ${S3_SECRET_KEY}
+
+discord:
+  webhook-url: ${DISCORD_WEBHOOK_URL}

src/main/resources/template-application-local.yml

@@ -69,3 +69,6 @@ cloud:
     credentials:
       access-key: ${S3_ACCESS_KEY}
       secret-key: ${S3_SECRET_KEY}
+
+discord:
+  webhook-url: ${DISCORD_WEBHOOK_URL}

src/test/resources/application.yml

@@ -49,3 +49,6 @@ cloud:
     credentials:
       access-key: test
       secret-key: test
+
+discord:
+  webhook-url: test