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stacks.go
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stacks.go
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// Copyright (c) 2015 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 goroutines
import (
"bufio"
"bytes"
"fmt"
"io"
"runtime"
"strconv"
"strings"
)
func getStackBuffer(all bool) []byte {
for i := 4096; ; i *= 2 {
buf := make([]byte, i)
if n := runtime.Stack(buf, all); n < i {
return buf
}
}
}
// parseGoStackHeader parses a stack header that looks like:
// goroutine 643 [runnable]:\n
// And returns the goroutine ID, and the state.
func parseGoStackHeader(line string) (goroutineID int, state string) {
line = strings.TrimSuffix(line, ":\n")
parts := strings.SplitN(line, " ", 3)
if len(parts) != 3 {
panic(fmt.Sprintf("unexpected stack header format: %v", line))
}
id, err := strconv.Atoi(parts[1])
if err != nil {
panic(fmt.Sprintf("failed to parse goroutine ID: %v", parts[1]))
}
state = strings.TrimSuffix(strings.TrimPrefix(parts[2], "["), "]")
return id, state
}
// Stack represents a single Goroutine's stack.
type Stack struct {
id int
state string
fullStack *bytes.Buffer
}
// ID returns the goroutine ID.
func (s Stack) ID() int {
return s.id
}
// State returns the Goroutine's state.
func (s Stack) State() string {
return s.state
}
// Full returns the full stack trace for this goroutine.
func (s Stack) Full() []byte {
return s.fullStack.Bytes()
}
func (s Stack) String() string {
return fmt.Sprintf("Goroutine %v in state %v:\n%s", s.id, s.state, s.Full())
}
// GetAll returns the stacks for all running goroutines.
func GetAll() []Stack {
var stacks []Stack
var curStack *Stack
stackReader := bufio.NewReader(bytes.NewReader(getStackBuffer(true /* all */)))
for {
line, err := stackReader.ReadString('\n')
if err == io.EOF {
break
}
if err != nil {
panic("stack reader failed")
}
// If we see the goroutine header, start a new stack.
if strings.HasPrefix(line, "goroutine ") {
// flush any previous stack
if curStack != nil {
stacks = append(stacks, *curStack)
}
id, goState := parseGoStackHeader(line)
curStack = &Stack{
id: id,
state: goState,
fullStack: &bytes.Buffer{},
}
}
curStack.fullStack.WriteString(line)
}
if curStack != nil {
stacks = append(stacks, *curStack)
}
return stacks
}