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Copy pathrecovery.go
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204 lines (185 loc) · 5.68 KB
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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.
package gin
import (
"bufio"
"bytes"
"cmp"
"errors"
"fmt"
"io"
"log"
"net/http"
"net/http/httputil"
"os"
"runtime"
"strings"
"syscall"
"time"
"github.com/gin-gonic/gin/internal/bytesconv"
)
const (
dunno = "???"
stackSkip = 3
)
// RecoveryFunc defines the function passable to CustomRecovery.
type RecoveryFunc func(c *Context, err any)
// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
func Recovery() HandlerFunc {
return RecoveryWithWriter(DefaultErrorWriter)
}
// CustomRecovery returns a middleware that recovers from any panics and calls the provided handle func to handle it.
func CustomRecovery(handle RecoveryFunc) HandlerFunc {
return RecoveryWithWriter(DefaultErrorWriter, handle)
}
// RecoveryWithWriter returns a middleware for a given writer that recovers from any panics and writes a 500 if there was one.
func RecoveryWithWriter(out io.Writer, recovery ...RecoveryFunc) HandlerFunc {
if len(recovery) > 0 {
return CustomRecoveryWithWriter(out, recovery[0])
}
return CustomRecoveryWithWriter(out, defaultHandleRecovery)
}
// CustomRecoveryWithWriter returns a middleware for a given writer that recovers from any panics and calls the provided handle func to handle it.
func CustomRecoveryWithWriter(out io.Writer, handle RecoveryFunc) HandlerFunc {
var logger *log.Logger
if out != nil {
logger = log.New(out, "\n\n\x1b[31m", log.LstdFlags)
}
return func(c *Context) {
defer func() {
if rec := recover(); rec != nil {
// Check for a broken connection, as it is not really a
// condition that warrants a panic stack trace.
var isBrokenPipe bool
err, ok := rec.(error)
if ok {
isBrokenPipe = errors.Is(err, syscall.EPIPE) ||
errors.Is(err, syscall.ECONNRESET) ||
errors.Is(err, http.ErrAbortHandler)
}
if logger != nil {
if isBrokenPipe {
logger.Printf("%s\n%s%s", rec, secureRequestDump(c.Request), reset)
} else if IsDebugging() {
logger.Printf("[Recovery] %s panic recovered:\n%s\n%s\n%s%s",
timeFormat(time.Now()), secureRequestDump(c.Request), rec, stack(stackSkip), reset)
} else {
logger.Printf("[Recovery] %s panic recovered:\n%s\n%s%s",
timeFormat(time.Now()), rec, stack(stackSkip), reset)
}
}
if isBrokenPipe {
// If the connection is dead, we can't write a status to it.
c.Error(err) //nolint: errcheck
c.Abort()
} else {
handle(c, rec)
}
}
}()
c.Next()
}
}
// secureRequestDump returns a sanitized HTTP request dump where the Authorization header,
// if present, is replaced with a masked value ("Authorization: *") to avoid leaking sensitive credentials.
//
// Currently, only the Authorization header is sanitized. All other headers and request data remain unchanged.
func secureRequestDump(r *http.Request) string {
httpRequest, _ := httputil.DumpRequest(r, false)
lines := strings.Split(bytesconv.BytesToString(httpRequest), "\r\n")
for i, line := range lines {
if strings.HasPrefix(line, "Authorization:") {
lines[i] = "Authorization: *"
}
}
return strings.Join(lines, "\r\n")
}
func defaultHandleRecovery(c *Context, err any) {
e, ok := err.(error)
if !ok {
e = fmt.Errorf("%v", err)
}
c.Error(e) //nolint: errcheck
c.AbortWithStatus(http.StatusInternalServerError)
}
// 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 (
nLine string
lastFile string
err error
)
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 {
nLine, err = readNthLine(file, line-1)
if err != nil {
continue
}
lastFile = file
}
fmt.Fprintf(buf, "\t%s: %s\n", function(pc), cmp.Or(nLine, dunno))
}
return buf.Bytes()
}
// readNthLine reads the nth line from the file.
// It returns the trimmed content of the line if found,
// or an empty string if the line doesn't exist.
// If there's an error opening the file, it returns the error.
func readNthLine(file string, n int) (string, error) {
if n < 0 {
return "", nil
}
f, err := os.Open(file)
if err != nil {
return "", err
}
defer f.Close()
scanner := bufio.NewScanner(f)
for i := 0; i < n; i++ {
if !scanner.Scan() {
return "", nil
}
}
if scanner.Scan() {
return strings.TrimSpace(scanner.Text()), nil
}
return "", nil
}
// function returns, if possible, the name of the function containing the PC.
func function(pc uintptr) string {
fn := runtime.FuncForPC(pc)
if fn == nil {
return dunno
}
name := 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 contain dot (e.g. code.google.com/...),
// so first eliminate the path prefix
if lastSlash := strings.LastIndexByte(name, '/'); lastSlash >= 0 {
name = name[lastSlash+1:]
}
if period := strings.IndexByte(name, '.'); period >= 0 {
name = name[period+1:]
}
name = strings.ReplaceAll(name, "·", ".")
return name
}
// timeFormat returns a customized time string for logger.
func timeFormat(t time.Time) string {
return t.Format("2006/01/02 - 15:04:05")
}