109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright (c) 2016 Uber Technologies, Inc.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
package hclog
|
|
|
|
import (
|
|
"bytes"
|
|
"runtime"
|
|
"strconv"
|
|
"strings"
|
|
"sync"
|
|
)
|
|
|
|
var (
|
|
_stacktraceIgnorePrefixes = []string{
|
|
"runtime.goexit",
|
|
"runtime.main",
|
|
}
|
|
_stacktracePool = sync.Pool{
|
|
New: func() interface{} {
|
|
return newProgramCounters(64)
|
|
},
|
|
}
|
|
)
|
|
|
|
// A stacktrace gathered by a previous call to log.Stacktrace. If passed
|
|
// to a logging function, the stacktrace will be appended.
|
|
type CapturedStacktrace string
|
|
|
|
// Gather a stacktrace of the current goroutine and return it to be passed
|
|
// to a logging function.
|
|
func Stacktrace() CapturedStacktrace {
|
|
return CapturedStacktrace(takeStacktrace())
|
|
}
|
|
|
|
func takeStacktrace() string {
|
|
programCounters := _stacktracePool.Get().(*programCounters)
|
|
defer _stacktracePool.Put(programCounters)
|
|
|
|
var buffer bytes.Buffer
|
|
|
|
for {
|
|
// Skip the call to runtime.Counters and takeStacktrace so that the
|
|
// program counters start at the caller of takeStacktrace.
|
|
n := runtime.Callers(2, programCounters.pcs)
|
|
if n < cap(programCounters.pcs) {
|
|
programCounters.pcs = programCounters.pcs[:n]
|
|
break
|
|
}
|
|
// Don't put the too-short counter slice back into the pool; this lets
|
|
// the pool adjust if we consistently take deep stacktraces.
|
|
programCounters = newProgramCounters(len(programCounters.pcs) * 2)
|
|
}
|
|
|
|
i := 0
|
|
frames := runtime.CallersFrames(programCounters.pcs)
|
|
for frame, more := frames.Next(); more; frame, more = frames.Next() {
|
|
if shouldIgnoreStacktraceFunction(frame.Function) {
|
|
continue
|
|
}
|
|
if i != 0 {
|
|
buffer.WriteByte('\n')
|
|
}
|
|
i++
|
|
buffer.WriteString(frame.Function)
|
|
buffer.WriteByte('\n')
|
|
buffer.WriteByte('\t')
|
|
buffer.WriteString(frame.File)
|
|
buffer.WriteByte(':')
|
|
buffer.WriteString(strconv.Itoa(int(frame.Line)))
|
|
}
|
|
|
|
return buffer.String()
|
|
}
|
|
|
|
func shouldIgnoreStacktraceFunction(function string) bool {
|
|
for _, prefix := range _stacktraceIgnorePrefixes {
|
|
if strings.HasPrefix(function, prefix) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
type programCounters struct {
|
|
pcs []uintptr
|
|
}
|
|
|
|
func newProgramCounters(size int) *programCounters {
|
|
return &programCounters{make([]uintptr, size)}
|
|
}
|