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feat: Coroutine, Reactor 관련 MDC 설정 추가
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65 changes: 65 additions & 0 deletions
65
src/main/kotlin/com/balancemania/api/config/reactor/MdcContextLifterConfiguration.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| package com.balancemania.api.config.reactor | ||
|
|
||
| import com.balancemania.api.extension.copyToMdc | ||
| import jakarta.annotation.PostConstruct | ||
| import jakarta.annotation.PreDestroy | ||
| import org.reactivestreams.Subscription | ||
| import org.springframework.context.annotation.Configuration | ||
| import reactor.core.CoreSubscriber | ||
| import reactor.core.publisher.Hooks | ||
| import reactor.core.publisher.Operators | ||
| import reactor.util.context.Context | ||
|
|
||
| /** | ||
| * 리액터 쓰레드 변경시 MDC 값 전파하기 위해서 사용합니다. | ||
| * @link https://www.novatec-gmbh.de/en/blog/how-can-the-mdc-context-be-used-in-the-reactive-spring-applications/ | ||
| */ | ||
| @Configuration | ||
| class MdcContextLifterConfiguration { | ||
| companion object { | ||
| val MDC_CONTEXT_REACTOR_KEY: String = MdcContextLifterConfiguration::class.java.name | ||
| } | ||
|
|
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| @PostConstruct | ||
| fun contextOperatorHook() { | ||
| Hooks.onEachOperator( | ||
| MDC_CONTEXT_REACTOR_KEY, | ||
| Operators.lift { _, subscriber -> | ||
| MdcContextLifter<Any?>(subscriber) | ||
| } | ||
| ) | ||
| } | ||
|
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| @PreDestroy | ||
| fun cleanupHook() { | ||
| Hooks.resetOnEachOperator(MDC_CONTEXT_REACTOR_KEY) | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Helper that copies the state of Reactor [Context] to MDC on the #onNext function. | ||
| */ | ||
| class MdcContextLifter<T>( | ||
| private val coreSubscriber: CoreSubscriber<T>, | ||
| ) : CoreSubscriber<T> { | ||
| override fun onSubscribe(subscription: Subscription) { | ||
| coreSubscriber.onSubscribe(subscription) | ||
| } | ||
|
|
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| override fun onNext(t: T) { | ||
| coreSubscriber.currentContext().copyToMdc() | ||
| coreSubscriber.onNext(t) | ||
| } | ||
|
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| override fun onError(throwable: Throwable) { | ||
| coreSubscriber.onError(throwable) | ||
| } | ||
|
|
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| override fun onComplete() { | ||
| coreSubscriber.onComplete() | ||
| } | ||
|
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| override fun currentContext(): Context { | ||
| return coreSubscriber.currentContext() | ||
| } | ||
| } |
30 changes: 30 additions & 0 deletions
30
src/main/kotlin/com/balancemania/api/extension/ContextExtension.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| package com.balancemania.api.extension | ||
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|
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| import com.balancemania.api.common.MDC_KEY_TRACE_ID | ||
| import org.slf4j.MDC | ||
| import reactor.util.context.Context | ||
|
|
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| /** | ||
| * Extension function for the Reactor [Context]. Copies the current context to the MDC, if context is empty clears the MDC. | ||
| * State of the MDC after calling this method should be same as Reactor [Context] state. | ||
| * One thread-local access only. | ||
| */ | ||
| fun Context.copyToMdc() { | ||
| if (!this.isEmpty) { | ||
| val map = this.toMap() | ||
| MDC.setContextMap(map) | ||
| } else { | ||
| MDC.clear() | ||
| } | ||
| } | ||
|
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| private fun Context.toMap(): Map<String, String> = this.stream() | ||
| .map { ctx -> ctx.key.toString() to ctx.value.toString() } | ||
| .toList().toMap() | ||
|
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| fun Context.insertMDC(): Context { | ||
| val traceId = MDC.get(MDC_KEY_TRACE_ID) | ||
| val ctxMap = this.toMap().toMutableMap() | ||
| ctxMap[MDC_KEY_TRACE_ID] = traceId | ||
| return Context.of(ctxMap) | ||
| } |
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9 changes: 9 additions & 0 deletions
9
src/main/kotlin/com/balancemania/api/extension/ReactorExtension.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package com.balancemania.api.extension | ||
|
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| import kotlinx.coroutines.reactive.awaitSingle | ||
| import reactor.core.publisher.Mono | ||
|
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| suspend fun <T : Any> Mono<T>.awaitSingleWithMdc(): T { | ||
| return this.contextWrite { it.insertMDC() } | ||
| .awaitSingle() | ||
| } |