feat: MDC 로깅 적용

Author: m3k0813

.gitignore

@@ -36,4 +36,6 @@ out/
 ### VS Code ###
 .vscode/
 
-src/main/resources/**
+src/main/resources/application.yml
+src/main/resources/application-dev.yml
+src/main/resources/application-prod.yml

src/main/java/com/gotogether/global/interceptor/LoggingInterceptor.java

@@ -2,6 +2,7 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
 import org.springframework.web.servlet.HandlerInterceptor;
 import org.springframework.web.util.ContentCachingRequestWrapper;
 import org.springframework.web.util.ContentCachingResponseWrapper;
@@ -18,6 +19,9 @@ public class LoggingInterceptor implements HandlerInterceptor {
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         request.setAttribute(START_TIME, System.currentTimeMillis());
 
+        String traceId = java.util.UUID.randomUUID().toString();
+        MDC.put("traceId", traceId);
+
         logger.info("===================== [로깅 인터셉터 시작] =====================");
         logger.info("[요청] {} {}", request.getMethod(), request.getRequestURI());
         logRequestHeaders(request);
@@ -39,6 +43,8 @@ public void afterCompletion(HttpServletRequest request, HttpServletResponse resp
         logResponseHeaders(response);
         logResponseBody(response);
         logger.info("===========================================================\n");
+
+        MDC.clear();
     }
 
     private void logRequestHeaders(HttpServletRequest request) {

src/main/resources/logback.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>
+                %d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %highlight(%-5level) %cyan(%logger{36}) - [TRACE-%X{traceId}] %msg%n
+            </pattern>
+            <charset>UTF-8</charset>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+</configuration>