package middleware

import (
	"bytes"
	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
	"io/ioutil"
	"net"
	"net/http"
	"net/http/httputil"
	"os"
	"runtime/debug"
	"strings"
	"time"
)

func NewLogger() gin.HandlerFunc {
	return func(c *gin.Context) {
		// 开始时间
		startTime := time.Now()               // 处理请求
		endTime := time.Now()                 // 执行时间
		latencyTime := endTime.Sub(startTime) // 请求方式
		path := c.Request.URL.Path
		query := c.Request.URL.RawQuery
		data, _ := ioutil.ReadAll(c.Request.Body)
		dataStr := string(data)
		if len(dataStr) > 1000 {
			// 数据太大就不记录了
			dataStr = ""
		}
		zap.L().Info("path",
			zap.Int("status", c.Writer.Status()),
			zap.String("method", c.Request.Method),
			zap.String("path", path),
			zap.String("query", query),
			zap.Any("body", dataStr),
			zap.String("ip", c.ClientIP()),
			zap.String("user-agent", c.Request.UserAgent()),
			zap.String("errors", c.Errors.ByType(gin.ErrorTypePrivate).String()),
			zap.Duration("latencyTime", latencyTime))
		c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(data))
		c.Next()
	}
}

// GinRecovery recover掉项目可能出现的panic，并记录日志
func GinRecovery(stack bool) gin.HandlerFunc {
	return func(c *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				// Check for a broken connection, as it is not really a
				// condition that warrants a panic stack trace.
				var brokenPipe bool
				if ne, ok := err.(*net.OpError); ok {
					if se, ok := ne.Err.(*os.SyscallError); ok {
						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") || strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
							brokenPipe = true
						}
					}
				}
				httpRequest, _ := httputil.DumpRequest(c.Request, false)
				if brokenPipe {
					zap.L().Error(c.Request.URL.Path,
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
					// If the connection is dead, we can't write a status to it.
					c.Error(err.(error)) // nolint: errcheck
					c.Abort()
					return
				}
				if stack {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
						zap.String("stack", string(debug.Stack())),
					)
				} else {
					zap.L().Error("[Recovery from panic]",
						zap.Any("error", err),
						zap.String("request", string(httpRequest)),
					)
				}
				c.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		c.Next()
	}
}