SEEN/backend/internal/middleware/request_id.go

package middleware

import (
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"go.uber.org/zap"
)

const requestIDHeader = "X-Request-ID"

func RequestID() gin.HandlerFunc {
	return func(c *gin.Context) {
		requestID := c.GetHeader(requestIDHeader)
		if requestID == "" {
			requestID = uuid.NewString()
		}

		c.Set("request_id", requestID)
		c.Header(requestIDHeader, requestID)
		c.Next()
	}
}

func AccessLog(log *zap.Logger) gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		c.Next()

		requestID, _ := c.Get("request_id")
		log.Info("request",
			zap.String("method", c.Request.Method),
			zap.String("path", c.FullPath()),
			zap.Int("status", c.Writer.Status()),
			zap.Duration("duration", time.Since(start)),
			zap.String("client_ip", c.ClientIP()),
			zap.String("request_id", toString(requestID)),
		)
	}
}

func Recovery(log *zap.Logger) gin.HandlerFunc {
	return gin.CustomRecovery(func(c *gin.Context, recovered any) {
		requestID, _ := c.Get("request_id")
		log.Error("panic recovered",
			zap.Any("panic", recovered),
			zap.String("request_id", toString(requestID)),
		)

		c.AbortWithStatusJSON(500, gin.H{
			"error":     "internal server error",
			"requestId": toString(requestID),
		})
	})
}

func toString(value any) string {
	typed, ok := value.(string)
	if !ok {
		return ""
	}
	return typed
}