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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package leaktest provides tools to detect leaked goroutines in tests.
// To use it, call "defer leaktest.Check(t)()" at the beginning of each
// test that may use goroutines.
// copied out of the cockroachdb source tree with slight modifications to be
// more re-useable
package leaktest
import (
"context"
"fmt"
"runtime"
"sort"
"strconv"
"strings"
"time"
)
type goroutine struct {
id uint64
stack string
}
type goroutineByID []*goroutine
func (g goroutineByID) Len() int { return len(g) }
func (g goroutineByID) Less(i, j int) bool { return g[i].id < g[j].id }
func (g goroutineByID) Swap(i, j int) { g[i], g[j] = g[j], g[i] }
func interestingGoroutine(g string) (*goroutine, error) {
sl := strings.SplitN(g, "\n", 2)
if len(sl) != 2 {
return nil, fmt.Errorf("error parsing stack: %q", g)
}
stack := strings.TrimSpace(sl[1])
if strings.HasPrefix(stack, "testing.RunTests") {
return nil, nil
}
if stack == "" ||
// Ignore HTTP keep alives
strings.Contains(stack, ").readLoop(") ||
strings.Contains(stack, ").writeLoop(") ||
// Below are the stacks ignored by the upstream leaktest code.
strings.Contains(stack, "testing.Main(") ||
strings.Contains(stack, "testing.(*T).Run(") ||
strings.Contains(stack, "runtime.goexit") ||
strings.Contains(stack, "created by runtime.gc") ||
strings.Contains(stack, "interestingGoroutines") ||
strings.Contains(stack, "runtime.MHeap_Scavenger") ||
strings.Contains(stack, "signal.signal_recv") ||
strings.Contains(stack, "sigterm.handler") ||
strings.Contains(stack, "runtime_mcall") ||
strings.Contains(stack, "goroutine in C code") {
return nil, nil
}
// Parse the goroutine's ID from the header line.
h := strings.SplitN(sl[0], " ", 3)
if len(h) < 3 {
return nil, fmt.Errorf("error parsing stack header: %q", sl[0])
}
id, err := strconv.ParseUint(h[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("error parsing goroutine id: %s", err)
}
return &goroutine{id: id, stack: strings.TrimSpace(g)}, nil
}
// interestingGoroutines returns all goroutines we care about for the purpose
// of leak checking. It excludes testing or runtime ones.
func interestingGoroutines(t ErrorReporter) []*goroutine {
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
var gs []*goroutine
for _, g := range strings.Split(string(buf), "\n\n") {
gr, err := interestingGoroutine(g)
if err != nil {
t.Errorf("leaktest: %s", err)
continue
} else if gr == nil {
continue
}
gs = append(gs, gr)
}
sort.Sort(goroutineByID(gs))
return gs
}
// ErrorReporter is a tiny subset of a testing.TB to make testing not such a
// massive pain
type ErrorReporter interface {
Errorf(format string, args ...interface{})
}
// Check snapshots the currently-running goroutines and returns a
// function to be run at the end of tests to see whether any
// goroutines leaked, waiting up to 5 seconds in error conditions
func Check(t ErrorReporter) func() {
return CheckTimeout(t, 5*time.Second)
}
// CheckTimeout is the same as Check, but with a configurable timeout
func CheckTimeout(t ErrorReporter, dur time.Duration) func() {
ctx, cancel := context.WithCancel(context.Background())
fn := CheckContext(ctx, t)
return func() {
timer := time.AfterFunc(dur, cancel)
fn()
// Remember to clean up the timer and context
timer.Stop()
cancel()
}
}
// CheckContext is the same as Check, but uses a context.Context for
// cancellation and timeout control
func CheckContext(ctx context.Context, t ErrorReporter) func() {
orig := map[uint64]bool{}
for _, g := range interestingGoroutines(t) {
orig[g.id] = true
}
return func() {
var leaked []string
for {
select {
case <-ctx.Done():
t.Errorf("leaktest: timed out checking goroutines")
default:
leaked = make([]string, 0)
for _, g := range interestingGoroutines(t) {
if !orig[g.id] {
leaked = append(leaked, g.stack)
}
}
if len(leaked) == 0 {
return
}
// don't spin needlessly
time.Sleep(time.Millisecond * 50)
continue
}
break
}
for _, g := range leaked {
t.Errorf("leaktest: leaked goroutine: %v", g)
}
}
}
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