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