Function ParsePanic

parse_panic.go:16–74

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.

(text string)

// 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)