gotosocial/vendor/codeberg.org/gruf/go-errors/v2/callers.go
dependabot[bot] a6c6bdb34a
[chore]: Bump codeberg.org/gruf/go-errors/v2 from 2.0.2 to 2.1.1 (#1346)
Bumps codeberg.org/gruf/go-errors/v2 from 2.0.2 to 2.1.1.

---
updated-dependencies:
- dependency-name: codeberg.org/gruf/go-errors/v2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
2023-01-17 11:25:13 +00:00

98 lines
2.1 KiB
Go

package errors
import (
"encoding/json"
"runtime"
"strconv"
"strings"
"unsafe"
)
// Callers is a stacktrace of caller PCs.
type Callers []uintptr
// GetCallers returns a Callers slice of PCs, of at most 'depth'.
func GetCallers(skip int, depth int) Callers {
rpc := make([]uintptr, depth)
n := runtime.Callers(skip+1, rpc)
return Callers(rpc[0:n])
}
// Frames fetches runtime frames for a slice of caller PCs.
func (f Callers) Frames() []runtime.Frame {
// Allocate expected frames slice
frames := make([]runtime.Frame, 0, len(f))
// Get frames iterator for PCs
iter := runtime.CallersFrames(f)
for {
// Get next frame in iter
frame, ok := iter.Next()
if !ok {
break
}
// Append to frames slice
frames = append(frames, frame)
}
return frames
}
// MarshalJSON implements json.Marshaler to provide an easy, simple default.
func (f Callers) MarshalJSON() ([]byte, error) {
// JSON-able frame type
type jsonFrame struct {
Func string `json:"func"`
File string `json:"file"`
Line int `json:"line"`
}
// Convert to frames
frames := f.Frames()
// Allocate expected size jsonFrame slice
jsonFrames := make([]jsonFrame, 0, len(f))
for i := 0; i < len(frames); i++ {
frame := frames[i]
// Convert each to jsonFrame object
jsonFrames = append(jsonFrames, jsonFrame{
Func: funcname(frame.Function),
File: frame.File,
Line: frame.Line,
})
}
// marshal converted frames
return json.Marshal(frames)
}
// String will return a simple string representation of receiving Callers slice.
func (f Callers) String() string {
// Guess-timate to reduce allocs
buf := make([]byte, 0, 64*len(f))
// Convert to frames
frames := f.Frames()
for i := 0; i < len(frames); i++ {
frame := frames[i]
// Append formatted caller info
fn := funcname(frame.Function)
buf = append(buf, fn+"()\n\t"+frame.File+":"...)
buf = strconv.AppendInt(buf, int64(frame.Line), 10)
buf = append(buf, '\n')
}
return *(*string)(unsafe.Pointer(&buf))
}
// funcname splits a function name with pkg from its path prefix.
func funcname(name string) string {
i := strings.LastIndex(name, "/")
return name[i+1:]
}