Add internal/middleware/logger.go

internal/middleware/logger.go

@@ -0,0 +1,44 @@
+package middleware
+
+import (
+	"log"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+// Logger 结构化日志中间件，记录请求 ID、方法、路径、状态码、耗时、客户端 IP
+func Logger() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+		path := c.Request.URL.Path
+		if raw := c.Request.URL.RawQuery; raw != "" {
+			path = path + "?" + raw
+		}
+
+		c.Next()
+
+		cost := time.Since(start)
+		rid := GetRequestID(c)
+		status := c.Writer.Status()
+
+		// 根据状态码选择日志级别标记
+		level := "INFO"
+		if status >= 500 {
+			level = "ERROR"
+		} else if status >= 400 {
+			level = "WARN"
+		}
+
+		log.Printf("[%s] req_id=%s | %s %s | %d | %s | ip=%s | size=%d",
+			level,
+			rid,
+			c.Request.Method,
+			path,
+			status,
+			cost.String(),
+			c.ClientIP(),
+			c.Writer.Size(),
+		)
+	}
+}