service/library/middleware/logger.go

package middleware

import (
	"bytes"
	"fmt"
	"github.com/gin-gonic/gin"
	"service/library/logger"
	"strings"
	"time"
)

var defaultLogFormatter = func(param gin.LogFormatterParams) string {
	if param.Latency > time.Minute {
		// Truncate in a golang < 1.8 safe way
		param.Latency = param.Latency - param.Latency%time.Second
	}
	return fmt.Sprintf("|%3d|%13v|%15s|%-7s %#v\t%s",
		param.StatusCode,
		param.Latency,
		param.ClientIP,
		param.Method,
		param.Path,
		param.ErrorMessage,
	)
}

type bodyLogWriter struct {
	gin.ResponseWriter
	body *bytes.Buffer
}

func (w bodyLogWriter) Write(b []byte) (int, error) {
	w.body.Write(b)
	return w.ResponseWriter.Write(b)
}

func LoggerMiddleware(conf gin.LoggerConfig) gin.HandlerFunc {
	formatter := conf.Formatter
	if formatter == nil {
		formatter = defaultLogFormatter
	}

	return func(c *gin.Context) {
		// Start timer
		start := time.Now()
		path := c.Request.URL.Path
		raw := c.Request.URL.RawQuery

		//body writer
		blw := &bodyLogWriter{body: bytes.NewBufferString(""), ResponseWriter: c.Writer}
		c.Writer = blw

		// Process request
		c.Next()

		notlogged := conf.SkipPaths
		var skip map[string]struct{}
		if length := len(notlogged); length > 0 {
			skip = make(map[string]struct{}, length)

			for _, path := range notlogged {
				skip[path] = struct{}{}
			}
		}

		// Log only when path is not being skipped
		if _, ok := skip[path]; !ok {
			param := gin.LogFormatterParams{
				Request: c.Request,
				Keys:    c.Keys,
			}
			// Stop timer
			param.TimeStamp = time.Now()
			param.Latency = param.TimeStamp.Sub(start)

			param.ClientIP = c.ClientIP()
			param.Method = c.Request.Method
			param.StatusCode = c.Writer.Status()
			param.ErrorMessage = c.Errors.ByType(gin.ErrorTypePrivate).String()

			param.BodySize = c.Writer.Size()

			if raw != "" {
				path = path + "?" + raw
			}

			param.Path = path

			var bodyStr string
			body, ok := c.Get(gin.BodyBytesKey)
			if ok {
				bodyStr = string(body.([]byte))
			}
			logger.Info("%s params: %s", formatter(param), bodyStr)
			if strings.Contains(param.Path, "is_there_a_new_version_available") {
				logger.Info("%s response: %s", formatter(param), blw.body.String())
			}

			//logger.WithCtx(c.Request.Context()).Info("%s params: %s", formatter(param), bodyStr)
			//if accessConf.LogResponseEnabled {
			//	logger.WithCtx(c.Request.Context()).Info("%s response: %s", formatter(param), blw.body.String())
			//}
		}
	}
}