feat: Payment 도메인의 커스텀 예외 추가 및 서비스 코드 수정

src/main/kotlin/roomescape/payment/business/PaymentService.kt

@@ -1,10 +1,9 @@
 package roomescape.payment.business
 
-import org.springframework.http.HttpStatus
 import org.springframework.stereotype.Service
 import org.springframework.transaction.annotation.Transactional
-import roomescape.common.exception.ErrorType
+import roomescape.payment.exception.PaymentErrorCode
-import roomescape.common.exception.RoomescapeException
+import roomescape.payment.exception.PaymentException
 import roomescape.payment.infrastructure.client.PaymentApproveResponse
 import roomescape.payment.infrastructure.persistence.CanceledPaymentEntity
 import roomescape.payment.infrastructure.persistence.CanceledPaymentRepository
@@ -24,44 +23,45 @@ class PaymentService(
 ) {
     @Transactional
     fun createPayment(
-            paymentResponse: PaymentApproveResponse,
+            approveResponse: PaymentApproveResponse,
             reservation: ReservationEntity
-    ): PaymentCreateResponse = PaymentEntity(
+    ): PaymentCreateResponse {
-            orderId = paymentResponse.orderId,
+        val payment = PaymentEntity(
-            paymentKey = paymentResponse.paymentKey,
+                orderId = approveResponse.orderId,
-            totalAmount = paymentResponse.totalAmount,
+                paymentKey = approveResponse.paymentKey,
-            reservation = reservation,
+                totalAmount = approveResponse.totalAmount,
-            approvedAt = paymentResponse.approvedAt
+                reservation = reservation,
-    ).also {
+                approvedAt = approveResponse.approvedAt
-        paymentRepository.save(it)
+        )
-    }.toCreateResponse()
+
+        return paymentRepository.save(payment).toCreateResponse()
+    }
 
     @Transactional(readOnly = true)
-    fun isReservationPaid(
+    fun isReservationPaid(reservationId: Long): Boolean = paymentRepository.existsByReservationId(reservationId)
-            reservationId: Long
-    ): Boolean = paymentRepository.existsByReservationId(reservationId)
 
     @Transactional
     fun createCanceledPayment(
             cancelInfo: PaymentCancelResponse,
             approvedAt: OffsetDateTime,
             paymentKey: String
-    ): CanceledPaymentEntity = CanceledPaymentEntity(
+    ): CanceledPaymentEntity {
-            paymentKey = paymentKey,
+        val canceledPayment = CanceledPaymentEntity(
-            cancelReason = cancelInfo.cancelReason,
+                paymentKey = paymentKey,
-            cancelAmount = cancelInfo.cancelAmount,
+                cancelReason = cancelInfo.cancelReason,
-            approvedAt = approvedAt,
+                cancelAmount = cancelInfo.cancelAmount,
-            canceledAt = cancelInfo.canceledAt
+                approvedAt = approvedAt,
-    ).also { canceledPaymentRepository.save(it) }
+                canceledAt = cancelInfo.canceledAt
+        )
+
+        return canceledPaymentRepository.save(canceledPayment)
+    }
 
     @Transactional
     fun createCanceledPaymentByReservationId(reservationId: Long): PaymentCancelRequest {
         val paymentKey: String = paymentRepository.findPaymentKeyByReservationId(reservationId)
-                ?: throw RoomescapeException(
+                ?: throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
-                        ErrorType.PAYMENT_NOT_FOUND,
+
-                        "[reservationId: $reservationId]",
-                        HttpStatus.NOT_FOUND
-                )
         // 취소 시간은 현재 시간으로 일단 생성한 뒤, 결제 취소 완료 후 해당 시간으로 변경합니다.
         val canceled: CanceledPaymentEntity = cancelPayment(paymentKey)
 
@@ -73,23 +73,19 @@ class PaymentService(
             cancelReason: String = "고객 요청",
             canceledAt: OffsetDateTime = OffsetDateTime.now()
     ): CanceledPaymentEntity {
-        val paymentEntity: PaymentEntity = paymentRepository.findByPaymentKey(paymentKey)
+        val payment: PaymentEntity = paymentRepository.findByPaymentKey(paymentKey)
                 ?.also { paymentRepository.delete(it) }
-                ?: throw RoomescapeException(
+                ?: throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
-                        ErrorType.PAYMENT_NOT_FOUND,
-                        "[paymentKey: $paymentKey]",
-                        HttpStatus.NOT_FOUND
-                )
 
-        return CanceledPaymentEntity(
+        val canceledPayment = CanceledPaymentEntity(
                 paymentKey = paymentKey,
                 cancelReason = cancelReason,
-                cancelAmount = paymentEntity.totalAmount,
+                cancelAmount = payment.totalAmount,
-                approvedAt = paymentEntity.approvedAt,
+                approvedAt = payment.approvedAt,
                 canceledAt = canceledAt
-        ).also {
+        )
-            canceledPaymentRepository.save(it)
+
-        }
+        return canceledPaymentRepository.save(canceledPayment)
     }
 
     @Transactional
@@ -97,12 +93,8 @@ class PaymentService(
             paymentKey: String,
             canceledAt: OffsetDateTime
     ) {
-        canceledPaymentRepository.findByPaymentKey(paymentKey)?.let {
+        canceledPaymentRepository.findByPaymentKey(paymentKey)
-            it.canceledAt = canceledAt
+                ?.apply { this.canceledAt = canceledAt }
-        } ?: throw RoomescapeException(
+                ?: throw PaymentException(PaymentErrorCode.PAYMENT_NOT_FOUND)
-                ErrorType.PAYMENT_NOT_FOUND,
-                "[paymentKey: $paymentKey]",
-                HttpStatus.NOT_FOUND
-        )
     }
 }

src/main/kotlin/roomescape/payment/exception/PaymentErrorCode.kt

@@ -0,0 +1,16 @@
+package roomescape.payment.exception
+
+import org.springframework.http.HttpStatus
+import roomescape.common.exception.ErrorCode
+
+enum class PaymentErrorCode(
+        override val httpStatus: HttpStatus,
+        override val errorCode: String,
+        override val message: String
+) : ErrorCode {
+    PAYMENT_NOT_FOUND(HttpStatus.NOT_FOUND, "P001", "결제 정보를 찾을 수 없어요."),
+    CANCELED_PAYMENT_NOT_FOUND(HttpStatus.NOT_FOUND, "P002", "취소된 결제 정보를 찾을 수 없어요."),
+    PAYMENT_CLIENT_ERROR(HttpStatus.BAD_REQUEST, "P003", "결제에 실패했어요. 결제 수단을 확인한 후 다시 시도해주세요."),
+
+    PAYMENT_PROVIDER_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "P999", "시스템에 일시적인 오류가 발생했어요. 잠시 후 다시 시도해주세요.")
+}

src/main/kotlin/roomescape/payment/exception/PaymentException.kt

@@ -0,0 +1,8 @@
+package roomescape.payment.exception
+
+import roomescape.common.exception.RoomescapeExceptionV2
+
+class PaymentException(
+        override val errorCode: PaymentErrorCode,
+        override val message: String = errorCode.message
+) : RoomescapeExceptionV2(errorCode, message)

src/test/kotlin/roomescape/payment/business/PaymentServiceTest.kt

@@ -11,6 +11,8 @@ import io.mockk.runs
 import org.springframework.http.HttpStatus
 import roomescape.common.exception.ErrorType
 import roomescape.common.exception.RoomescapeException
+import roomescape.payment.exception.PaymentErrorCode
+import roomescape.payment.exception.PaymentException
 import roomescape.payment.infrastructure.persistence.CanceledPaymentRepository
 import roomescape.payment.infrastructure.persistence.PaymentRepository
 import roomescape.payment.web.PaymentCancelRequest
@@ -23,19 +25,15 @@ class PaymentServiceTest : FunSpec({
 
     val paymentService = PaymentService(paymentRepository, canceledPaymentRepository)
 
-    context("cancelPaymentByAdmin") {
+    context("createCanceledPaymentByReservationId") {
         val reservationId = 1L
         test("reservationId로 paymentKey를 찾을 수 없으면 예외를 던진다.") {
             every { paymentRepository.findPaymentKeyByReservationId(reservationId) } returns null
 
-            val exception = shouldThrow<RoomescapeException> {
+            val exception = shouldThrow<PaymentException> {
                 paymentService.createCanceledPaymentByReservationId(reservationId)
             }
-
+            exception.errorCode shouldBe PaymentErrorCode.PAYMENT_NOT_FOUND
-            assertSoftly(exception) {
-                this.errorType shouldBe ErrorType.PAYMENT_NOT_FOUND
-                this.httpStatus shouldBe HttpStatus.NOT_FOUND
-            }
         }
 
         context("reservationId로 paymentKey를 찾고난 후") {
@@ -50,14 +48,10 @@ class PaymentServiceTest : FunSpec({
                     paymentRepository.findByPaymentKey(paymentKey)
                 } returns null
 
-                val exception = shouldThrow<RoomescapeException> {
+                val exception = shouldThrow<PaymentException> {
                     paymentService.createCanceledPaymentByReservationId(reservationId)
                 }
-
+                exception.errorCode shouldBe PaymentErrorCode.PAYMENT_NOT_FOUND
-                assertSoftly(exception) {
-                    this.errorType shouldBe ErrorType.PAYMENT_NOT_FOUND
-                    this.httpStatus shouldBe HttpStatus.NOT_FOUND
-                }
             }
 
             test("해당 paymentKey로 paymentEntity를 찾고, cancelPaymentEntity를 저장한다.") {
@@ -76,6 +70,7 @@ class PaymentServiceTest : FunSpec({
                 } returns PaymentFixture.createCanceled(
                         id = 1L,
                         paymentKey = paymentKey,
+                        cancelReason = "Test",
                         cancelAmount = paymentEntity.totalAmount,
                 )
 
@@ -84,7 +79,7 @@ class PaymentServiceTest : FunSpec({
                 assertSoftly(result) {
                     this.paymentKey shouldBe paymentKey
                     this.amount shouldBe paymentEntity.totalAmount
-                    this.cancelReason shouldBe "고객 요청"
+                    this.cancelReason shouldBe "Test"
                 }
             }
         }
@@ -99,14 +94,10 @@ class PaymentServiceTest : FunSpec({
                 canceledPaymentRepository.findByPaymentKey(paymentKey)
             } returns null
 
-            val exception = shouldThrow<RoomescapeException> {
+            val exception = shouldThrow<PaymentException> {
                 paymentService.updateCanceledTime(paymentKey, canceledAt)
             }
-
+            exception.errorCode shouldBe PaymentErrorCode.PAYMENT_NOT_FOUND
-            assertSoftly(exception) {
-                this.errorType shouldBe ErrorType.PAYMENT_NOT_FOUND
-                this.httpStatus shouldBe HttpStatus.NOT_FOUND
-            }
         }
 
         test("paymentKey로 canceledPaymentEntity를 찾고, canceledAt을 업데이트한다.") {