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stacktrace.go
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stacktrace.go
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package e5
import (
"errors"
"fmt"
"hash/maphash"
"path"
"path/filepath"
"runtime"
"strings"
"sync"
"unsafe"
)
// Stacktrace represents call stack frames
type Stacktrace struct {
hashSum uint64
}
var framesInfo sync.Map // uint64 -> []Frame
// Frame represents a call frame
type Frame struct {
File string
Dir string
Pkg string
Function string
PkgPath string
Line int
}
var _ error = new(Stacktrace)
// Error implements error interface
func (s *Stacktrace) Error() string {
v, ok := framesInfo.Load(s.hashSum)
if !ok {
panic("bad key")
}
frames := v.([]Frame)
var b strings.Builder
for i, frame := range frames {
if i == 0 {
b.WriteString("$ ")
} else {
b.WriteString("\n& ")
}
b.WriteString(fmt.Sprintf(
"%s:%s:%d %s %s",
frame.Pkg,
frame.File,
frame.Line,
frame.Dir,
frame.Function,
))
}
return b.String()
}
func (s *Stacktrace) Is(err error) bool {
// ignore content
if _, ok := err.(*Stacktrace); ok {
return true
}
return false
}
var pcsPool = sync.Pool{
New: func() any {
slice := make([]uintptr, 128)
return slice
},
}
var hasherPool = sync.Pool{
New: func() any {
return new(maphash.Hash)
},
}
// WrapStacktrace wraps current stacktrace
var WrapStacktrace = WrapFunc(func(prev error) error {
if prev == nil {
return nil
}
if stacktraceIncluded(prev) {
return prev
}
pcs := pcsPool.Get().([]uintptr)
defer func() {
pcsPool.Put(pcs)
}()
n := runtime.Callers(2, pcs)
pcs = pcs[:n]
hasher := hasherPool.Get().(*maphash.Hash)
defer func() {
hasher.Reset()
hasherPool.Put(hasher)
}()
for _, pc := range pcs {
hasher.Write(
unsafe.Slice(
(*byte)(unsafe.Pointer(&pc)),
unsafe.Sizeof(pc),
),
)
}
sum := hasher.Sum64()
if _, ok := framesInfo.Load(sum); !ok {
// construct frame infos
frames := make([]Frame, 0, n)
runtimeFrames := runtime.CallersFrames(pcs[:n])
for {
frame, more := runtimeFrames.Next()
if strings.HasPrefix(frame.Function, "github.com/reusee/e5.") &&
!strings.HasPrefix(frame.Function, "github.com/reusee/e5.Test") {
// internal funcs
if !more {
break
}
continue
}
dir, file := filepath.Split(frame.File)
mod, fn := path.Split(frame.Function)
if i := strings.Index(dir, mod); i > 0 {
dir = dir[i:]
}
pkg := fn[:strings.IndexByte(fn, '.')]
pkgPath := mod + pkg
frames = append(frames, Frame{
File: file,
Dir: dir,
Line: frame.Line,
Pkg: pkg,
Function: fn,
PkgPath: pkgPath,
})
if !more {
break
}
}
framesInfo.LoadOrStore(sum, frames)
}
stacktrace := &Stacktrace{
hashSum: sum,
}
err := Join(stacktrace, prev)
return err
})
func stacktraceIncluded(err error) bool {
var p *Stacktrace
return errors.Is(err, p)
}
var errStacktrace = errors.New("stacktrace")