gin/recovery.go

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// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
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package gin
import (
"bytes"
"fmt"
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"io"
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"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"os"
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"runtime"
"strings"
"time"
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)
var (
dunno = []byte("???")
centerDot = []byte("·")
dot = []byte(".")
slash = []byte("/")
)
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// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
func Recovery() HandlerFunc {
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return RecoveryWithWriter(DefaultErrorWriter)
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}
// RecoveryWithWriter returns a middleware for a given writer that recovers from any panics and writes a 500 if there was one.
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func RecoveryWithWriter(out io.Writer) HandlerFunc {
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var logger *log.Logger
if out != nil {
logger = log.New(out, "\n\n\x1b[31m", log.LstdFlags)
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}
return func(c *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
}
}
}
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if logger != nil {
stack := stack(3)
httprequest, _ := httputil.DumpRequest(c.Request, false)
if brokenPipe {
logger.Printf("%s\n%s%s", err, string(httprequest), reset)
} else if IsDebugging() {
logger.Printf("[Recovery] %s panic recovered:\n%s\n%s\n%s%s",
timeFormat(time.Now()), string(httprequest), err, stack, reset)
} else {
logger.Printf("[Recovery] %s panic recovered:\n%s\n%s%s",
timeFormat(time.Now()), err, stack, reset)
}
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}
// If the connection is dead, we can't write a status to it.
if brokenPipe {
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c.Error(err.(error)) // nolint: errcheck
c.Abort()
} else {
c.AbortWithStatus(http.StatusInternalServerError)
}
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}
}()
c.Next()
}
}
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// stack returns a nicely formatted stack frame, skipping skip frames.
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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 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 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, slash); lastslash >= 0 {
name = name[lastslash+1:]
}
if period := bytes.Index(name, dot); period >= 0 {
name = name[period+1:]
}
name = bytes.Replace(name, centerDot, dot, -1)
return name
}
func timeFormat(t time.Time) string {
var timeString = t.Format("2006/01/02 - 15:04:05")
return timeString
}