updates

server/internal/middleware/logger.go

@@ -0,0 +1,41 @@
+// internal/middleware/logger.go
+package middleware
+
+import (
+	"strconv"
+	"time"
+
+	"go-server/pkg/logger"
+
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+)
+
+// Logger provides lightweight structured logging and response time header
+func Logger() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+
+		c.Next()
+
+		latency := time.Since(start)
+		status := c.Writer.Status()
+		method := c.Request.Method
+		path := c.Request.URL.Path
+		ip := c.ClientIP()
+		ua := c.Request.UserAgent()
+
+		// Expose response time for clients/benchmarks
+		c.Header("X-Response-Time", strconv.FormatInt(latency.Microseconds(), 10)+"us")
+
+		// Structured log (zap is very fast and minimally blocking)
+		logger.Info("http_request",
+			zap.Int("status", status),
+			zap.String("method", method),
+			zap.String("path", path),
+			zap.Int64("latency_us", latency.Microseconds()),
+			zap.String("ip", ip),
+			zap.String("user_agent", ua),
+		)
+	}
+}