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// Copyright 2023 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.
//go:build go1.21
package quic
import (
"bytes"
"fmt"
"os"
"runtime"
"testing"
"time"
)
func TestMain(m *testing.M) {
// Add all goroutines running at the start of the test to the set
// of not-leaked goroutines. This includes TestMain, and anything else
// that might have been started by test infrastructure.
skip := [][]byte{
[]byte("created by os/signal.Notify"),
[]byte("gotraceback_test.go"),
}
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
for _, g := range bytes.Split(buf, []byte("\n\n")) {
id, _, _ := bytes.Cut(g, []byte("["))
skip = append(skip, id)
}
defer os.Exit(m.Run())
// Look for leaked goroutines.
//
// Checking after every test makes it easier to tell which test is the culprit,
// but checking once at the end is faster and less likely to miss something.
if runtime.GOOS == "js" {
// The js-wasm runtime creates an additional background goroutine.
// Just skip the leak check there.
return
}
start := time.Now()
warned := false
for {
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
leaked := false
for _, g := range bytes.Split(buf, []byte("\n\n")) {
leaked = true
for _, s := range skip {
if bytes.Contains(g, s) {
leaked = false
break
}
}
}
if !leaked {
break
}
if !warned && time.Since(start) > 1*time.Second {
// Print a warning quickly, in case this is an interactive session.
// Keep waiting until the test times out, in case this is a slow trybot.
fmt.Printf("Tests seem to have leaked some goroutines, still waiting.\n\n")
fmt.Print(string(buf))
warned = true
}
// Goroutines might still be shutting down.
time.Sleep(1 * time.Millisecond)
}
}
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