| package errors |
| |
| import ( |
| "strconv" |
| "strings" |
| ) |
| |
| type uncaughtPanic struct{ message string } |
| |
| func (p uncaughtPanic) Error() string { |
| return p.message |
| } |
| |
| // ParsePanic allows you to get an error object from the output of a go program |
| // that panicked. This is particularly useful with https://github.com/mitchellh/panicwrap. |
| func ParsePanic(text string) (*Error, error) { |
| lines := strings.Split(text, "\n") |
| |
| state := "start" |
| |
| var message string |
| var stack []StackFrame |
| |
| for i := 0; i < len(lines); i++ { |
| line := lines[i] |
| |
| if state == "start" { |
| if strings.HasPrefix(line, "panic: ") { |
| message = strings.TrimPrefix(line, "panic: ") |
| state = "seek" |
| } else { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (no prefix): %s", line) |
| } |
| |
| } else if state == "seek" { |
| if strings.HasPrefix(line, "goroutine ") && strings.HasSuffix(line, "[running]:") { |
| state = "parsing" |
| } |
| |
| } else if state == "parsing" { |
| if line == "" { |
| state = "done" |
| break |
| } |
| createdBy := false |
| if strings.HasPrefix(line, "created by ") { |
| line = strings.TrimPrefix(line, "created by ") |
| createdBy = true |
| } |
| |
| i++ |
| |
| if i >= len(lines) { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (unpaired): %s", line) |
| } |
| |
| frame, err := parsePanicFrame(line, lines[i], createdBy) |
| if err != nil { |
| return nil, err |
| } |
| |
| stack = append(stack, *frame) |
| if createdBy { |
| state = "done" |
| break |
| } |
| } |
| } |
| |
| if state == "done" || state == "parsing" { |
| return &Error{Err: uncaughtPanic{message}, frames: stack}, nil |
| } |
| return nil, Errorf("could not parse panic: %v", text) |
| } |
| |
| // The lines we're passing look like this: |
| // |
| // main.(*foo).destruct(0xc208067e98) |
| // /0/go/src/github.com/bugsnag/bugsnag-go/pan/main.go:22 +0x151 |
| func parsePanicFrame(name string, line string, createdBy bool) (*StackFrame, error) { |
| idx := strings.LastIndex(name, "(") |
| if idx == -1 && !createdBy { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (no call): %s", name) |
| } |
| if idx != -1 { |
| name = name[:idx] |
| } |
| pkg := "" |
| |
| if lastslash := strings.LastIndex(name, "/"); lastslash >= 0 { |
| pkg += name[:lastslash] + "/" |
| name = name[lastslash+1:] |
| } |
| if period := strings.Index(name, "."); period >= 0 { |
| pkg += name[:period] |
| name = name[period+1:] |
| } |
| |
| name = strings.Replace(name, "ยท", ".", -1) |
| |
| if !strings.HasPrefix(line, "\t") { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (no tab): %s", line) |
| } |
| |
| idx = strings.LastIndex(line, ":") |
| if idx == -1 { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (no line number): %s", line) |
| } |
| file := line[1:idx] |
| |
| number := line[idx+1:] |
| if idx = strings.Index(number, " +"); idx > -1 { |
| number = number[:idx] |
| } |
| |
| lno, err := strconv.ParseInt(number, 10, 32) |
| if err != nil { |
| return nil, Errorf("bugsnag.panicParser: Invalid line (bad line number): %s", line) |
| } |
| |
| return &StackFrame{ |
| File: file, |
| LineNumber: int(lno), |
| Package: pkg, |
| Name: name, |
| }, nil |
| } |