164 lines
4.3 KiB
Go
164 lines
4.3 KiB
Go
// Copyright 2013 Martini Authors
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// Copyright 2014 The Macaron Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package macaron
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"net/http"
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"runtime"
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"github.com/go-macaron/inject"
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)
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const (
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panicHtml = `<html>
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<head><title>PANIC: %s</title>
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<meta charset="utf-8" />
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<style type="text/css">
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html, body {
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font-family: "Roboto", sans-serif;
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color: #333333;
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background-color: #ea5343;
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margin: 0px;
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}
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h1 {
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color: #d04526;
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background-color: #ffffff;
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padding: 20px;
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border-bottom: 1px dashed #2b3848;
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}
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pre {
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margin: 20px;
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padding: 20px;
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border: 2px solid #2b3848;
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background-color: #ffffff;
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white-space: pre-wrap; /* css-3 */
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white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
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white-space: -pre-wrap; /* Opera 4-6 */
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white-space: -o-pre-wrap; /* Opera 7 */
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word-wrap: break-word; /* Internet Explorer 5.5+ */
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}
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</style>
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</head><body>
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<h1>PANIC</h1>
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<pre style="font-weight: bold;">%s</pre>
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<pre>%s</pre>
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</body>
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</html>`
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)
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var (
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dunno = []byte("???")
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centerDot = []byte("·")
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dot = []byte(".")
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slash = []byte("/")
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)
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// stack returns a nicely formated stack frame, skipping skip frames
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func stack(skip int) []byte {
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buf := new(bytes.Buffer) // the returned data
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// As we loop, we open files and read them. These variables record the currently
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// loaded file.
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var lines [][]byte
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var lastFile string
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for i := skip; ; i++ { // Skip the expected number of frames
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pc, file, line, ok := runtime.Caller(i)
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if !ok {
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break
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}
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// Print this much at least. If we can't find the source, it won't show.
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fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
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if file != lastFile {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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continue
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}
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lines = bytes.Split(data, []byte{'\n'})
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lastFile = file
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}
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fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
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}
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return buf.Bytes()
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}
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// source returns a space-trimmed slice of the n'th line.
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func source(lines [][]byte, n int) []byte {
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n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
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if n < 0 || n >= len(lines) {
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return dunno
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}
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return bytes.TrimSpace(lines[n])
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}
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// function returns, if possible, the name of the function containing the PC.
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func function(pc uintptr) []byte {
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fn := runtime.FuncForPC(pc)
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if fn == nil {
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return dunno
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}
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name := []byte(fn.Name())
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// The name includes the path name to the package, which is unnecessary
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// since the file name is already included. Plus, it has center dots.
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// That is, we see
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// runtime/debug.*T·ptrmethod
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// and want
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// *T.ptrmethod
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// Also the package path might contains dot (e.g. code.google.com/...),
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// so first eliminate the path prefix
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if lastslash := bytes.LastIndex(name, slash); lastslash >= 0 {
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name = name[lastslash+1:]
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}
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if period := bytes.Index(name, dot); period >= 0 {
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name = name[period+1:]
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}
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name = bytes.Replace(name, centerDot, dot, -1)
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return name
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}
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// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
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// While Martini is in development mode, Recovery will also output the panic as HTML.
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func Recovery() Handler {
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return func(c *Context, log *log.Logger) {
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defer func() {
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if err := recover(); err != nil {
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stack := stack(3)
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log.Printf("PANIC: %s\n%s", err, stack)
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// Lookup the current responsewriter
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val := c.GetVal(inject.InterfaceOf((*http.ResponseWriter)(nil)))
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res := val.Interface().(http.ResponseWriter)
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// respond with panic message while in development mode
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var body []byte
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if Env == DEV {
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res.Header().Set("Content-Type", "text/html")
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body = []byte(fmt.Sprintf(panicHtml, err, err, stack))
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}
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res.WriteHeader(http.StatusInternalServerError)
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if nil != body {
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res.Write(body)
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}
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}
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}()
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c.Next()
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}
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}
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