zDWSI/defaultFrontend/midware.go

package main

import (
	"bytes"
	"fmt"
	"github.com/gin-gonic/gin"
	"io/ioutil"
	"net/http"
	"net/http/httputil"
	"runtime"
	"time"
)

var (
	crmchr_dunno     = []byte("???")
	crmchr_centerDot = []byte("·")
	crmchr_dot       = []byte(".")
	crmchr_slash     = []byte("/")
)

func CustomAccessLogMidware(alogger *AccessLogger, elogger *CommonLogger) gin.HandlerFunc {
	return func(context *gin.Context) {
		start := time.Now()
		path := context.Request.URL.Path
		raw := context.Request.URL.RawQuery
		context.Next()
		end := time.Now()
		latency := end.Sub(start)
		clientIP := context.ClientIP()
		method := context.Request.Method
		statusCode := context.Writer.Status()
		comment := context.Errors.ByType(gin.ErrorTypePrivate).String()
		if raw != "" {
			path = path + "?" + raw
		}
		alogger.Emit(start, statusCode, latency, clientIP, method, path)
		if comment != "" {
			elogger.EmitF(LogLv_WARN, "WebContext", "Web Context Error Info: %s", comment)
		}
	}
}

func CustomRecoveryMidware(logger *CommonLogger, isDebug bool) gin.HandlerFunc {
	return func(context *gin.Context) {
		defer func() {
			if err := recover(); err != nil {
				if logger != nil {
					stack := stack(3)
					if isDebug {
						httprequest, _ := httputil.DumpRequest(context.Request, false)
						msg := fmt.Sprintf("Panic recovered from error '%s':\n%s\n%s", err, string(httprequest), stack)
						logger.Emit(LogLv_PANIC, "Recovery", msg)
					} else {
						msg := fmt.Sprintf("Panic recovered from error '%s':\n%s", err, stack)
						logger.Emit(LogLv_PANIC, "Recovery", msg)
					}
				}
				context.AbortWithStatus(http.StatusInternalServerError)
			}
		}()
		context.Next()
	}
}

// stack returns a nicely formatted stack frame, skipping skip frames.
func stack(skip int) []byte {
	buf := new(bytes.Buffer) // the returned data
	// As we loop, we open files and read them. These variables record the currently
	// loaded file.
	var lines [][]byte
	var lastFile string
	for i := skip; ; i++ { // Skip the expected number of frames
		pc, file, line, ok := runtime.Caller(i)
		if !ok {
			break
		}
		// Print this much at least.  If we can't find the source, it won't show.
		fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
		if file != lastFile {
			data, err := ioutil.ReadFile(file)
			if err != nil {
				continue
			}
			lines = bytes.Split(data, []byte{'\n'})
			lastFile = file
		}
		fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
	}
	return buf.Bytes()
}

// source returns a space-trimmed slice of the n'th line.
func source(lines [][]byte, n int) []byte {
	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
	if n < 0 || n >= len(lines) {
		return crmchr_dunno
	}
	return bytes.TrimSpace(lines[n])
}

// function returns, if possible, the name of the function containing the PC.
func function(pc uintptr) []byte {
	fn := runtime.FuncForPC(pc)
	if fn == nil {
		return crmchr_dunno
	}
	name := []byte(fn.Name())
	// The name includes the path name to the package, which is unnecessary
	// since the file name is already included.  Plus, it has center dots.
	// That is, we see
	//	runtime/debug.*T·ptrmethod
	// and want
	//	*T.ptrmethod
	// Also the package path might contains dot (e.g. code.google.com/...),
	// so first eliminate the path prefix
	if lastslash := bytes.LastIndex(name, crmchr_slash); lastslash >= 0 {
		name = name[lastslash+1:]
	}
	if period := bytes.Index(name, crmchr_dot); period >= 0 {
		name = name[period+1:]
	}
	name = bytes.Replace(name, crmchr_centerDot, crmchr_dot, -1)
	return name
}