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net/http: deflake TestTransportConnectionCloseOnRequest

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Fixes #52450 (hopefully)

Change-Id: Ib723f8efb4a13af1b98c25cd02935425172d01e6
Reviewed-on: https://go-review.googlesource.com/c/go/+/401314
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Brad Fitzpatrick 2022-04-20 08:58:42 -07:00
parent 338a81741a
commit a2f7d9d95a
2 changed files with 40 additions and 11 deletions
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9
src/net/http/export_test.go
View File

@ -306,3 +306,12 @@ func ExportCloseTransportConnsAbruptly(tr *Transport) {
}
tr.idleMu.Unlock()
}
// ResponseWriterConnForTesting returns w's underlying connection, if w
// is a regular *response ResponseWriter.
func ResponseWriterConnForTesting(w ResponseWriter) (c net.Conn, ok bool) {
if r, ok := w.(*response); ok {
return r.conn.rwc, true
}
return nil, false
}

42
src/net/http/transport_test.go
View File

@ -57,6 +57,12 @@ var hostPortHandler = HandlerFunc(func(w ResponseWriter, r *Request) {
}
w.Header().Set("X-Saw-Close", fmt.Sprint(r.Close))
w.Write([]byte(r.RemoteAddr))
// Include the address of the net.Conn in addition to the RemoteAddr,
// in case kernels reuse source ports quickly (see Issue 52450)
if c, ok := ResponseWriterConnForTesting(w); ok {
fmt.Fprintf(w, ", %T %p", c, c)
}
})
// testCloseConn is a net.Conn tracked by a testConnSet.
@ -240,6 +246,12 @@ func TestTransportConnectionCloseOnResponse(t *testing.T) {
connSet.check(t)
}
// TestTransportConnectionCloseOnRequest tests that the Transport's doesn't reuse
// an underlying TCP connection after making an http.Request with Request.Close set.
//
// It tests the behavior by making an HTTP request to a server which
// describes the source source connection it got (remote port number +
// address of its net.Conn).
func TestTransportConnectionCloseOnRequest(t *testing.T) {
defer afterTest(t)
ts := httptest.NewServer(hostPortHandler)
@ -250,7 +262,7 @@ func TestTransportConnectionCloseOnRequest(t *testing.T) {
c := ts.Client()
tr := c.Transport.(*Transport)
tr.Dial = testDial
for _, connectionClose := range []bool{false, true} {
for _, reqClose := range []bool{false, true} {
fetch := func(n int) string {
req := new(Request)
var err error
@ -262,29 +274,37 @@ func TestTransportConnectionCloseOnRequest(t *testing.T) {
req.Proto = "HTTP/1.1"
req.ProtoMajor = 1
req.ProtoMinor = 1
req.Close = connectionClose
req.Close = reqClose
res, err := c.Do(req)
if err != nil {
t.Fatalf("error in connectionClose=%v, req #%d, Do: %v", connectionClose, n, err)
t.Fatalf("error in Request.Close=%v, req #%d, Do: %v", reqClose, n, err)
}
if got, want := res.Header.Get("X-Saw-Close"), fmt.Sprint(connectionClose); got != want {
t.Errorf("For connectionClose = %v; handler's X-Saw-Close was %v; want %v",
connectionClose, got, !connectionClose)
if got, want := res.Header.Get("X-Saw-Close"), fmt.Sprint(reqClose); got != want {
t.Errorf("for Request.Close = %v; handler's X-Saw-Close was %v; want %v",
reqClose, got, !reqClose)
}
body, err := io.ReadAll(res.Body)
if err != nil {
t.Fatalf("error in connectionClose=%v, req #%d, ReadAll: %v", connectionClose, n, err)
t.Fatalf("for Request.Close=%v, on request %v/2: ReadAll: %v", reqClose, n, err)
}
return string(body)
}
body1 := fetch(1)
body2 := fetch(2)
bodiesDiffer := body1 != body2
if bodiesDiffer != connectionClose {
t.Errorf("error in connectionClose=%v. unexpected bodiesDiffer=%v; body1=%q; body2=%q",
connectionClose, bodiesDiffer, body1, body2)
got := 1
if body1 != body2 {
got++
}
want := 1
if reqClose {
want = 2
}
if got != want {
t.Errorf("for Request.Close=%v: server saw %v unique connections, wanted %v\n\nbodies were: %q and %q",
reqClose, got, want, body1, body2)
}
tr.CloseIdleConnections()