feat: 사용자 구독 기능 구현

user/src/main/kotlin/com/van1164/user/subscribe/controller/SubscribeController.kt

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+package com.van1164.user.subscribe.controller
+
+import com.van1164.common.security.PrincipalDetails
+import com.van1164.user.subscribe.service.SubscribeService
+import org.springframework.http.ResponseEntity
+import org.springframework.security.core.annotation.AuthenticationPrincipal
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+import reactor.core.publisher.Mono
+
+
+@RestController
+@RequestMapping("/api/v1/user/subscribe")
+class SubscribeController(
+    private val subscribeService: SubscribeService
+) {
+
+    @PostMapping("/{toUserId}")
+    fun subscribe(
+        @PathVariable("toUserId") toUserId : String,
+        @AuthenticationPrincipal principal : Mono<PrincipalDetails>
+    ): Mono<ResponseEntity<String>> {
+        return principal.flatMap {user->
+            subscribeService.subscribe(user.name,toUserId)
+        }
+    }
+
+    @PostMapping("cancel/{toUserId}")
+    fun subscribeCancel(
+        @PathVariable("toUserId") toUserId : String,
+        @AuthenticationPrincipal principal : Mono<PrincipalDetails>
+    ): Mono<ResponseEntity<String>> {
+        return principal.flatMap {user->
+            subscribeService.subscribeCancel(user.name,toUserId)
+        }
+    }
+}

user/src/main/kotlin/com/van1164/user/subscribe/repository/SubscribeRepository.kt

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+package com.van1164.user.subscribe.repository
+
+import com.van1164.common.domain.UserSubscribe
+import org.springframework.data.r2dbc.repository.R2dbcRepository
+import reactor.core.publisher.Mono
+
+interface SubscribeRepository : R2dbcRepository<UserSubscribe,Long> {
+
+    fun existsByFromUserIdAndToUserId(fromUserId: String,toUserId: String) : Mono<Boolean>
+
+    fun findByFromUserIdAndToUserId(fromUserId : String, toUserId : String) : Mono<UserSubscribe>
+}

user/src/main/kotlin/com/van1164/user/subscribe/service/SubscribeService.kt

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+package com.van1164.user.subscribe.service
+
+import com.van1164.common.domain.UserSubscribe
+import com.van1164.common.exception.AlreadySubscribeException
+import com.van1164.user.UserRepository
+import com.van1164.user.subscribe.repository.SubscribeRepository
+import org.springframework.data.crossstore.ChangeSetPersister.NotFoundException
+import org.springframework.http.ResponseEntity
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+import reactor.core.publisher.Mono
+import reactor.kotlin.core.publisher.switchIfEmpty
+import reactor.kotlin.core.publisher.toMono
+
+@Service
+class SubscribeService(
+    private val subscribeRepository: SubscribeRepository,
+    private val userRepository: UserRepository
+) {
+
+    @Transactional
+    fun subscribe(fromUserId: String, toUserId: String): Mono<ResponseEntity<String>> {
+        return userRepository.findFirstByUserId(fromUserId)
+            .switchIfEmpty{Mono.error(NotFoundException())}
+            .flatMap {
+                userRepository.findFirstByUserId(toUserId)
+            }
+            .switchIfEmpty{Mono.error(NotFoundException())}
+            .flatMap {
+                subscribeRepository.existsByFromUserIdAndToUserId(fromUserId,toUserId)
+            }
+            .filter{it == false}
+            .switchIfEmpty { Mono.error(AlreadySubscribeException()) }
+            .map{
+                UserSubscribe(fromUserId,toUserId)
+            }
+            .flatMap {
+                subscribeRepository.save(it)
+            }
+            .map {
+                ResponseEntity.ok().body("success")
+            }
+            .onErrorResume {
+                when(it){
+                    is NotFoundException -> ResponseEntity.badRequest().body("존재하지 않는 User").toMono()
+                    is AlreadySubscribeException -> ResponseEntity.badRequest().body("이미 구독 중").toMono()
+                    else ->  ResponseEntity.badRequest().body("fail").toMono()
+                }
+            }
+    }
+
+    @Transactional
+    fun subscribeCancel(fromUserId: String, toUserId: String): Mono<ResponseEntity<String>> {
+        return subscribeRepository.findByFromUserIdAndToUserId(fromUserId,toUserId)
+            .doOnNext {
+                println(it)
+            }
+            .flatMap {
+                subscribeRepository.delete(it)
+            }
+            .thenReturn(ResponseEntity.ok().body("success"))
+            .defaultIfEmpty(ResponseEntity.badRequest().body("존재하지 않는 User"))
+            .onErrorReturn(ResponseEntity.badRequest().body("fail"))
+    }
+}

video/src/test/kotlin/repository/SubscribeRepositoryTest.kt

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+package repository
+
+import com.van1164.user.subscribe.repository.SubscribeRepository
+import com.van1164.video.VideoApplication
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.autoconfigure.data.r2dbc.DataR2dbcTest
+import org.springframework.boot.test.context.SpringBootTest
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+
+@SpringBootTest(classes = [VideoApplication::class])
+class SubscribeRepositoryTest(
+    @Autowired
+    private val subscribeRepository: SubscribeRepository
+) {
+
+    @Test
+    fun findByFromUserIdAndToUserId(){
+        val userSubscribe = subscribeRepository.findByFromUserIdAndToUserId("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        assertNotNull(userSubscribe)
+        assertEquals(userSubscribe.fromUserId,"GOOGLE_van1154van@gmail.com")
+    }
+}

video/src/test/kotlin/service/SubscribeServiceTest.kt

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+package service
+
+import com.van1164.user.subscribe.service.SubscribeService
+import com.van1164.video.VideoApplication
+import org.junit.jupiter.api.DisplayName
+import org.junit.jupiter.api.Test
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.http.HttpStatus
+import org.springframework.test.annotation.Rollback
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+
+
+@SpringBootTest(classes = [VideoApplication::class])
+class SubscribeServiceTest @Autowired constructor(
+    val subscribeService: SubscribeService
+) {
+
+    @Test
+    @DisplayName("구독 성공 테스트")
+    @Rollback(value = true)
+    fun successTest(){
+        val subscribe = subscribeService.subscribe("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        assert(subscribe != null)
+        assert(subscribe!!.statusCode == HttpStatus.OK)
+        assert(subscribe.body != null)
+        assert(subscribe.body == "success")
+    }
+
+    @Test
+    @DisplayName("없는 아이디로 인한 구독 실패 테스트")
+    @Rollback(value = true)
+    fun noUserIdFailTest(){
+        val subscribe = subscribeService.subscribe("GOOGLE_van1154van@gmail.com","test@gmail.com").block()
+        assertNotNull(subscribe)
+        assertEquals(subscribe.statusCode,HttpStatus.BAD_REQUEST)
+        assertNotNull(subscribe.body)
+        assertEquals(subscribe.body ,"존재하지 않는 User")
+    }
+
+    @Test
+    @DisplayName("이미 구독한 사용자 실패 테스트")
+    @Rollback(value = true)
+    fun duplicatedSubscribeFailTest(){
+        subscribeService.subscribe("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        val subscribe = subscribeService.subscribe("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        assertNotNull(subscribe)
+        assertEquals(subscribe.statusCode,HttpStatus.BAD_REQUEST)
+        assertNotNull(subscribe.body)
+        assertEquals(subscribe.body ,"이미 구독 중")
+    }
+
+    @Test
+    @DisplayName("구독 취소 성공 테스트")
+    @Rollback(value = true)
+    fun subscribeCancel(){
+        val subscribe = subscribeService.subscribe("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        assertNotNull(subscribe)
+        assertEquals(subscribe.statusCode,HttpStatus.OK)
+        assertNotNull(subscribe.body)
+        assertEquals(subscribe.body ,"success")
+
+        val cancel = subscribeService.subscribeCancel("GOOGLE_van1154van@gmail.com","GOOGLE_van1154van@gmail.com").block()
+        assertNotNull(cancel)
+        assertEquals(cancel.statusCode,HttpStatus.OK)
+        assertNotNull(cancel.body)
+        assertEquals(cancel.body ,"success")
+    }
+}