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112 lines
3.4 KiB
112 lines
3.4 KiB
// Copyright 2013 Martini Authors
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// Copyright 2014 The Macaron Authors
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// Copyright 2019 The Gitea Authors. All rights reserved.
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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 context
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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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"runtime"
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macaron "gopkg.in/macaron.v1"
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)
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// Recovery returns a middleware that recovers from any panics and writes a 500 and a log if so.
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// Although similar to macaron.Recovery() the main difference is that this error will be created
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// with the gitea 500 page.
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func Recovery() macaron.Handler {
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return func(ctx *Context) {
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defer func() {
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if err := recover(); err != nil {
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combinedErr := fmt.Errorf("%s\n%s", err, string(stack(3)))
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ctx.ServerError("PANIC:", combinedErr)
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}
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}()
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ctx.Next()
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}
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}
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var (
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unknown = []byte("???")
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)
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// Although we could just use debug.Stack(), this routine will return the source code
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// skip the provided number of frames - i.e. allowing us to ignore this function call
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// and the preceding function call.
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// If the problem is a lack of memory of course all this is not going to work...
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func stack(skip int) []byte {
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buf := new(bytes.Buffer)
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// Store the last file we opened as its probable that the preceding stack frame
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// will be in the same file
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var lines [][]byte
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var lastFilename string
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for i := skip; ; i++ { // Skip over frames
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programCounter, filename, lineNumber, ok := runtime.Caller(i)
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// If we can't retrieve the information break - basically we're into go internals at this point.
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if !ok {
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break
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}
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// Print equivalent of debug.Stack()
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fmt.Fprintf(buf, "%s:%d (0x%x)\n", filename, lineNumber, programCounter)
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// Now try to print the offending line
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if filename != lastFilename {
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data, err := ioutil.ReadFile(filename)
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if err != nil {
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// can't read this sourcefile
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// likely we don't have the sourcecode available
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continue
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}
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lines = bytes.Split(data, []byte{'\n'})
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lastFilename = filename
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}
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fmt.Fprintf(buf, "\t%s: %s\n", functionName(programCounter), source(lines, lineNumber))
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}
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return buf.Bytes()
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}
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// functionName converts the provided programCounter into a function name
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func functionName(programCounter uintptr) []byte {
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function := runtime.FuncForPC(programCounter)
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if function == nil {
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return unknown
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}
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name := []byte(function.Name())
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// Because we provide the filename we can drop the preceding package name.
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if lastslash := bytes.LastIndex(name, []byte("/")); lastslash >= 0 {
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name = name[lastslash+1:]
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}
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// And the current package name.
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if period := bytes.Index(name, []byte(".")); period >= 0 {
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name = name[period+1:]
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}
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// And we should just replace the interpunct with a dot
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name = bytes.Replace(name, []byte("·"), []byte("."), -1)
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return name
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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 unknown
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}
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return bytes.TrimSpace(lines[n])
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}
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