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|
package stack
import (
"fmt"
io "io"
"os"
"runtime"
"strconv"
"strings"
"sync"
"github.com/containerd/typeurl/v2"
"github.com/pkg/errors"
)
var helpers map[string]struct{}
var helpersMu sync.RWMutex
func init() {
typeurl.Register((*Stack)(nil), "github.com/moby/buildkit", "stack.Stack+json")
helpers = map[string]struct{}{}
}
var version string
var revision string
func SetVersionInfo(v, r string) {
version = v
revision = r
}
func Helper() {
var pc [1]uintptr
n := runtime.Callers(2, pc[:])
if n == 0 {
return
}
frames := runtime.CallersFrames(pc[:n])
frame, _ := frames.Next()
helpersMu.Lock()
helpers[frame.Function] = struct{}{}
helpersMu.Unlock()
}
func Traces(err error) []*Stack {
var st []*Stack
switch e := err.(type) {
case interface{ Unwrap() error }:
st = Traces(e.Unwrap())
case interface{ Unwrap() []error }:
for _, ue := range e.Unwrap() {
st = Traces(ue)
// Only take first stack
if len(st) > 0 {
break
}
}
}
switch ste := err.(type) {
case interface{ StackTrace() errors.StackTrace }:
st = append(st, convertStack(ste.StackTrace()))
case interface{ StackTrace() *Stack }:
st = append(st, ste.StackTrace())
}
return st
}
func Enable(err error) error {
if err == nil {
return nil
}
Helper()
if !hasLocalStackTrace(err) {
return errors.WithStack(err)
}
return err
}
func Wrap(err error, s *Stack) error {
return &withStack{stack: s, error: err}
}
func hasLocalStackTrace(err error) bool {
wrapped, ok := err.(interface {
Unwrap() error
})
if ok && hasLocalStackTrace(wrapped.Unwrap()) {
return true
}
_, ok = err.(interface {
StackTrace() errors.StackTrace
})
return ok
}
func Formatter(err error) fmt.Formatter {
return &formatter{err}
}
type formatter struct {
error
}
func (w *formatter) Format(s fmt.State, verb rune) {
if w.error == nil {
fmt.Fprintf(s, "%v", w.error)
return
}
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%s\n", w.Error())
for _, stack := range Traces(w.error) {
fmt.Fprintf(s, "%d %s %s\n", stack.Pid, stack.Version, strings.Join(stack.Cmdline, " "))
for _, f := range stack.Frames {
fmt.Fprintf(s, "%s\n\t%s:%d\n", f.Name, f.File, f.Line)
}
fmt.Fprintln(s)
}
return
}
fallthrough
case 's':
io.WriteString(s, w.Error())
case 'q':
fmt.Fprintf(s, "%q", w.Error())
}
}
func convertStack(s errors.StackTrace) *Stack {
var out Stack
helpersMu.RLock()
defer helpersMu.RUnlock()
for _, f := range s {
dt, err := f.MarshalText()
if err != nil {
continue
}
p := strings.SplitN(string(dt), " ", 2)
if len(p) != 2 {
continue
}
if _, ok := helpers[p[0]]; ok {
continue
}
idx := strings.LastIndexByte(p[1], ':')
if idx == -1 {
continue
}
line, err := strconv.ParseInt(p[1][idx+1:], 10, 32)
if err != nil {
continue
}
out.Frames = append(out.Frames, &Frame{
Name: p[0],
File: p[1][:idx],
Line: int32(line),
})
}
out.Cmdline = os.Args
out.Pid = int32(os.Getpid())
out.Version = version
out.Revision = revision
return &out
}
type withStack struct {
stack *Stack
error
}
func (e *withStack) Unwrap() error {
return e.error
}
func (e *withStack) StackTrace() *Stack {
return e.stack
}
|
