/usr/share/gocode/src/github.com/getsentry/raven-go/stacktrace.go is in golang-github-getsentry-raven-go-dev 0.0~git20150721.0.74c334d-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Some code from the runtime/debug package of the Go standard library.
package raven
import (
"bytes"
"go/build"
"io/ioutil"
"path/filepath"
"runtime"
"strings"
"sync"
)
// http://sentry.readthedocs.org/en/latest/developer/interfaces/index.html#sentry.interfaces.Stacktrace
type Stacktrace struct {
// Required
Frames []*StacktraceFrame `json:"frames"`
}
func (s *Stacktrace) Class() string { return "stacktrace" }
func (s *Stacktrace) Culprit() string {
for i := len(s.Frames) - 1; i >= 0; i-- {
frame := s.Frames[i]
if frame.InApp == true && frame.Module != "" && frame.Function != "" {
return frame.Module + "." + frame.Function
}
}
return ""
}
type StacktraceFrame struct {
// At least one required
Filename string `json:"filename,omitempty"`
Function string `json:"function,omitempty"`
Module string `json:"module,omitempty"`
// Optional
Lineno int `json:"lineno,omitempty"`
Colno int `json:"colno,omitempty"`
AbsolutePath string `json:"abs_path,omitempty"`
ContextLine string `json:"context_line,omitempty"`
PreContext []string `json:"pre_context,omitempty"`
PostContext []string `json:"post_context,omitempty"`
InApp bool `json:"in_app"`
}
// Intialize and populate a new stacktrace, skipping skip frames.
//
// context is the number of surrounding lines that should be included for context.
// Setting context to 3 would try to get seven lines. Setting context to -1 returns
// one line with no surrounding context, and 0 returns no context.
//
// appPackagePrefixes is a list of prefixes used to check whether a package should
// be considered "in app".
func NewStacktrace(skip int, context int, appPackagePrefixes []string) *Stacktrace {
var frames []*StacktraceFrame
for i := 1 + skip; ; i++ {
pc, file, line, ok := runtime.Caller(i)
if !ok {
break
}
frame := NewStacktraceFrame(pc, file, line, context, appPackagePrefixes)
if frame != nil {
frames = append(frames, frame)
}
}
// Sentry wants the frames with the oldest first, so reverse them
for i, j := 0, len(frames)-1; i < j; i, j = i+1, j-1 {
frames[i], frames[j] = frames[j], frames[i]
}
return &Stacktrace{frames}
}
// Build a single frame using data returned from runtime.Caller.
//
// context is the number of surrounding lines that should be included for context.
// Setting context to 3 would try to get seven lines. Setting context to -1 returns
// one line with no surrounding context, and 0 returns no context.
//
// appPackagePrefixes is a list of prefixes used to check whether a package should
// be considered "in app".
func NewStacktraceFrame(pc uintptr, file string, line, context int, appPackagePrefixes []string) *StacktraceFrame {
frame := &StacktraceFrame{AbsolutePath: file, Filename: trimPath(file), Lineno: line, InApp: false}
frame.Module, frame.Function = functionName(pc)
// `runtime.goexit` is effectively a placeholder that comes from
// runtime/asm_amd64.s and is meaningless.
if frame.Module == "runtime" && frame.Function == "goexit" {
return nil
}
if frame.Module == "main" {
frame.InApp = true
} else {
for _, prefix := range appPackagePrefixes {
if strings.HasPrefix(frame.Module, prefix) && !strings.Contains(frame.Module, "vendor") && !strings.Contains(frame.Module, "third_party") {
frame.InApp = true
}
}
}
if context > 0 {
contextLines, lineIdx := fileContext(file, line, context)
if len(contextLines) > 0 {
for i, line := range contextLines {
switch {
case i < lineIdx:
frame.PreContext = append(frame.PreContext, string(line))
case i == lineIdx:
frame.ContextLine = string(line)
default:
frame.PostContext = append(frame.PostContext, string(line))
}
}
}
} else if context == -1 {
contextLine, _ := fileContext(file, line, 0)
if len(contextLine) > 0 {
frame.ContextLine = string(contextLine[0])
}
}
return frame
}
// Retrieve the name of the package and function containing the PC.
func functionName(pc uintptr) (pack string, name string) {
fn := runtime.FuncForPC(pc)
if fn == nil {
return
}
name = fn.Name()
// We get this:
// runtime/debug.*T·ptrmethod
// and want this:
// pack = runtime/debug
// name = *T.ptrmethod
if idx := strings.LastIndex(name, "."); idx != -1 {
pack = name[:idx]
name = name[idx+1:]
}
name = strings.Replace(name, "·", ".", -1)
return
}
var fileCacheLock sync.Mutex
var fileCache = make(map[string][][]byte)
func fileContext(filename string, line, context int) ([][]byte, int) {
fileCacheLock.Lock()
defer fileCacheLock.Unlock()
lines, ok := fileCache[filename]
if !ok {
data, err := ioutil.ReadFile(filename)
if err != nil {
return nil, 0
}
lines = bytes.Split(data, []byte{'\n'})
fileCache[filename] = lines
}
line-- // stack trace lines are 1-indexed
start := line - context
var idx int
if start < 0 {
start = 0
idx = line
} else {
idx = context
}
end := line + context + 1
if line >= len(lines) {
return nil, 0
}
if end > len(lines) {
end = len(lines)
}
return lines[start:end], idx
}
var trimPaths []string
// Try to trim the GOROOT or GOPATH prefix off of a filename
func trimPath(filename string) string {
for _, prefix := range trimPaths {
if trimmed := strings.TrimPrefix(filename, prefix); len(trimmed) < len(filename) {
return trimmed
}
}
return filename
}
func init() {
// Collect all source directories, and make sure they
// end in a trailing "separator"
for _, prefix := range build.Default.SrcDirs() {
if prefix[len(prefix)-1] != filepath.Separator {
prefix += string(filepath.Separator)
}
trimPaths = append(trimPaths, prefix)
}
}
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