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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 http_test
import (
"fmt"
"io"
"log"
"net/http"
"os"
"runtime"
"sort"
"strings"
"testing"
"time"
)
var quietLog = log.New(io.Discard, "", 0)
func TestMain(m *testing.M) {
*http.MaxWriteWaitBeforeConnReuse = 60 * time.Minute
v := m.Run()
if v == 0 && goroutineLeaked() {
os.Exit(1)
}
os.Exit(v)
}
func interestingGoroutines() (gs []string) {
buf := make([]byte, 2<<20)
buf = buf[:runtime.Stack(buf, true)]
for _, g := range strings.Split(string(buf), "\n\n") {
_, stack, _ := strings.Cut(g, "\n")
stack = strings.TrimSpace(stack)
if stack == "" ||
strings.Contains(stack, "testing.(*M).before.func1") ||
strings.Contains(stack, "os/signal.signal_recv") ||
strings.Contains(stack, "created by net.startServer") ||
strings.Contains(stack, "created by testing.RunTests") ||
strings.Contains(stack, "closeWriteAndWait") ||
strings.Contains(stack, "testing.Main(") ||
// These only show up with GOTRACEBACK=2; Issue 5005 (comment 28)
strings.Contains(stack, "runtime.goexit") ||
strings.Contains(stack, "created by runtime.gc") ||
strings.Contains(stack, "interestingGoroutines") ||
strings.Contains(stack, "runtime.MHeap_Scavenger") {
continue
}
gs = append(gs, stack)
}
sort.Strings(gs)
return
}
// Verify the other tests didn't leave any goroutines running.
func goroutineLeaked() bool {
if testing.Short() || runningBenchmarks() {
// Don't worry about goroutine leaks in -short mode or in
// benchmark mode. Too distracting when there are false positives.
return false
}
var stackCount map[string]int
for i := 0; i < 5; i++ {
n := 0
stackCount = make(map[string]int)
gs := interestingGoroutines()
for _, g := range gs {
stackCount[g]++
n++
}
if n == 0 {
return false
}
// Wait for goroutines to schedule and die off:
time.Sleep(100 * time.Millisecond)
}
fmt.Fprintf(os.Stderr, "Too many goroutines running after net/http test(s).\n")
for stack, count := range stackCount {
fmt.Fprintf(os.Stderr, "%d instances of:\n%s\n", count, stack)
}
return true
}
// setParallel marks t as a parallel test if we're in short mode
// (all.bash), but as a serial test otherwise. Using t.Parallel isn't
// compatible with the afterTest func in non-short mode.
func setParallel(t *testing.T) {
if strings.Contains(t.Name(), "HTTP2") {
http.CondSkipHTTP2(t)
}
if testing.Short() {
t.Parallel()
}
}
func runningBenchmarks() bool {
for i, arg := range os.Args {
if strings.HasPrefix(arg, "-test.bench=") && !strings.HasSuffix(arg, "=") {
return true
}
if arg == "-test.bench" && i < len(os.Args)-1 && os.Args[i+1] != "" {
return true
}
}
return false
}
var leakReported bool
func afterTest(t testing.TB) {
http.DefaultTransport.(*http.Transport).CloseIdleConnections()
if testing.Short() {
return
}
if leakReported {
// To avoid confusion, only report the first leak of each test run.
// After the first leak has been reported, we can't tell whether the leaked
// goroutines are a new leak from a subsequent test or just the same
// goroutines from the first leak still hanging around, and we may add a lot
// of latency waiting for them to exit at the end of each test.
return
}
// We shouldn't be running the leak check for parallel tests, because we might
// report the goroutines from a test that is still running as a leak from a
// completely separate test that has just finished. So we use non-atomic loads
// and stores for the leakReported variable, and store every time we start a
// leak check so that the race detector will flag concurrent leak checks as a
// race even if we don't detect any leaks.
leakReported = true
var bad string
badSubstring := map[string]string{
").readLoop(": "a Transport",
").writeLoop(": "a Transport",
"created by net/http/httptest.(*Server).Start": "an httptest.Server",
"timeoutHandler": "a TimeoutHandler",
"net.(*netFD).connect(": "a timing out dial",
").noteClientGone(": "a closenotifier sender",
}
var stacks string
for i := 0; i < 10; i++ {
bad = ""
stacks = strings.Join(interestingGoroutines(), "\n\n")
for substr, what := range badSubstring {
if strings.Contains(stacks, substr) {
bad = what
}
}
if bad == "" {
leakReported = false
return
}
// Bad stuff found, but goroutines might just still be
// shutting down, so give it some time.
time.Sleep(250 * time.Millisecond)
}
t.Errorf("Test appears to have leaked %s:\n%s", bad, stacks)
}
// waitCondition waits for fn to return true,
// checking immediately and then at exponentially increasing intervals.
func waitCondition(t testing.TB, delay time.Duration, fn func(time.Duration) bool) {
t.Helper()
start := time.Now()
var since time.Duration
for !fn(since) {
time.Sleep(delay)
delay = 2*delay - (delay / 2) // 1.5x, rounded up
since = time.Since(start)
}
}