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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 util.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 (
"runtime"
"sort"
"strings"
"time"
)
// interestingGoroutines returns all goroutines we care about for the purpose
// of leak checking. It excludes testing or runtime ones.
func interestingGoroutines() (gs []string) {
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
for _, g := range strings.Split(string(buf), "\n\n") {
sl := strings.SplitN(g, "\n", 2)
if len(sl) != 2 {
continue
}
stack := strings.TrimSpace(sl[1])
if strings.HasPrefix(stack, "testing.RunTests") {
continue
}
if stack == "" ||
// 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") {
continue
}
gs = append(gs, strings.TrimSpace(g))
}
sort.Strings(gs)
return
}
// 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.
func Check(t ErrorReporter) func() {
orig := map[string]bool{}
for _, g := range interestingGoroutines() {
orig[g] = true
}
return func() {
// Loop, waiting for goroutines to shut down.
// Wait up to 5 seconds, but finish as quickly as possible.
deadline := time.Now().Add(5 * time.Second)
for {
var leaked []string
for _, g := range interestingGoroutines() {
if !orig[g] {
leaked = append(leaked, g)
}
}
if len(leaked) == 0 {
return
}
if time.Now().Before(deadline) {
time.Sleep(50 * time.Millisecond)
continue
}
for _, g := range leaked {
t.Errorf("Leaked goroutine: %v", g)
}
return
}
}
}
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