Gollang fiber zap logger

logger.go

package middlewares

import (
	"strconv"
	"time"

	"github.com/gofiber/fiber/v2"
	"go.uber.org/zap"
)

// Logger middleware for fiber
func Logger(parent *zap.Logger) fiber.Handler {
	return func(c *fiber.Ctx) error {
		req := c.Request()
		res := c.Response()
		start := time.Now()

		if err := c.Next(); err != nil {
			return err
		}

		// Latency
		latency := time.Since(start)

		// Request id
		requestID := string(req.Header.Peek(fiber.HeaderXRequestID))

		// Request path
		requestPath := string(req.URI().Path())
		if requestPath == "" {
			requestPath = "/"
		}

		// Bytes in
		bytesIn := string(req.Header.Peek(fiber.HeaderContentLength))
		if bytesIn == "" {
			bytesIn = "0"
		}

		// Bytes out
		bytesOut := string(res.Header.Peek(fiber.HeaderContentLength))
		if bytesOut == "" {
			bytesOut = "0"
		}

		// Log
		parent.Info(
			"request",
			zap.String("remote_ip", c.IP()),
			zap.Time("date", time.Now()),
			zap.String("method", c.Method()),
			zap.String("proto", c.Protocol()),
			zap.Int("status", res.StatusCode()),
			zap.String("bytes_in", bytesIn),
			zap.String("bytes_out", bytesOut),
			zap.String("latency_human", latency.String()),
			zap.String("latency_ns", strconv.FormatInt(int64(latency), 10)),
			zap.String("id", requestID),
			zap.String("host", string(req.Host())),
			zap.String("uri", string(req.RequestURI())),
			zap.String("path", requestPath),
		)

		return nil
	}
}