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Remove self-imposed limit on max concurrent streams if the server doesn't impose any. (#1624) 

* Remove self-imposed limit on max concurrent streams if the server allows it.

* Remove test necessitating buggy behavior.
This commit is contained in:
mmukhi 2017-10-26 10:05:17 -07:00 committed by GitHub
parent e9a5821d35
commit 0d399e6307
2 changed files with 16 additions and 49 deletions
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46
test/end2end_test.go
View File

@ -3675,52 +3675,6 @@ func testExceedMaxStreamsLimit(t *testing.T, e env) {
}
}
const defaultMaxStreamsClient = 100
func TestExceedDefaultMaxStreamsLimit(t *testing.T) {
defer leakcheck.Check(t)
for _, e := range listTestEnv() {
if e.name == "handler-tls" {
// The default max stream limit in handler_server is not 100?
continue
}
testExceedDefaultMaxStreamsLimit(t, e)
}
}
func testExceedDefaultMaxStreamsLimit(t *testing.T, e env) {
te := newTest(t, e)
te.declareLogNoise(
"http2Client.notifyError got notified that the client transport was broken",
"Conn.resetTransport failed to create client transport",
"grpc: the connection is closing",
)
// When masStream is set to 0 the server doesn't send a settings frame for
// MaxConcurrentStreams, essentially allowing infinite (math.MaxInt32) streams.
// In such a case, there should be a default cap on the client-side.
te.maxStream = 0
te.startServer(&testServer{security: e.security})
defer te.tearDown()
cc := te.clientConn()
tc := testpb.NewTestServiceClient(cc)
// Create as many streams as a client can.
for i := 0; i < defaultMaxStreamsClient; i++ {
if _, err := tc.StreamingInputCall(te.ctx); err != nil {
t.Fatalf("%v.StreamingInputCall(_) = _, %v, want _, <nil>", tc, err)
}
}
// Trying to create one more should timeout.
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel()
_, err := tc.StreamingInputCall(ctx)
if err == nil || grpc.Code(err) != codes.DeadlineExceeded {
t.Fatalf("%v.StreamingInputCall(_) = _, %v, want _, %s", tc, err, codes.DeadlineExceeded)
}
}
func TestStreamsQuotaRecovery(t *testing.T) {
defer leakcheck.Check(t)
for _, e := range listTestEnv() {

19
transport/http2_client.go
View File

@ -918,15 +918,28 @@ func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
s.write(recvMsg{err: io.EOF})
}
func (t *http2Client) handleSettings(f *http2.SettingsFrame) {
func (t *http2Client) handleSettings(f *http2.SettingsFrame, isFirst bool) {
if f.IsAck() {
return
}
var ss []http2.Setting
isMaxConcurrentStreamsMissing := true
f.ForeachSetting(func(s http2.Setting) error {
if s.ID == http2.SettingMaxConcurrentStreams {
isMaxConcurrentStreamsMissing = false
}
ss = append(ss, s)
return nil
})
if isFirst && isMaxConcurrentStreamsMissing {
// This means server is imposing no limits on
// maximum number of concurrent streams initiated by client.
// So we must remove our self-imposed limit.
ss = append(ss, http2.Setting{
ID: http2.SettingMaxConcurrentStreams,
Val: math.MaxUint32,
})
}
// The settings will be applied once the ack is sent.
t.controlBuf.put(&settings{ack: true, ss: ss})
}
@ -1125,7 +1138,7 @@ func (t *http2Client) reader() {
t.Close()
return
}
t.handleSettings(sf)
t.handleSettings(sf, true)
// loop to keep reading incoming messages on this transport.
for {
@ -1158,7 +1171,7 @@ func (t *http2Client) reader() {
case *http2.RSTStreamFrame:
t.handleRSTStream(frame)
case *http2.SettingsFrame:
t.handleSettings(frame)
t.handleSettings(frame, false)
case *http2.PingFrame:
t.handlePing(frame)
case *http2.GoAwayFrame: