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transport_test.go
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transport_test.go
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/*
*
* Copyright 2023 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package test
import (
"context"
"io"
"net"
"sync"
"testing"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/internal/grpcsync"
"google.golang.org/grpc/internal/stubserver"
"google.golang.org/grpc/internal/transport"
"google.golang.org/grpc/status"
testpb "google.golang.org/grpc/test/grpc_testing"
)
// connWrapperWithCloseCh wraps a net.Conn and fires an event when closed.
type connWrapperWithCloseCh struct {
net.Conn
close *grpcsync.Event
}
// Close closes the connection and sends a value on the close channel.
func (cw *connWrapperWithCloseCh) Close() error {
cw.close.Fire()
return cw.Conn.Close()
}
// These custom creds are used for storing the connections made by the client.
// The closeCh in conn can be used to detect when conn is closed.
type transportRestartCheckCreds struct {
mu sync.Mutex
connections []*connWrapperWithCloseCh
}
func (c *transportRestartCheckCreds) ServerHandshake(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
return rawConn, nil, nil
}
func (c *transportRestartCheckCreds) ClientHandshake(ctx context.Context, authority string, rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
c.mu.Lock()
defer c.mu.Unlock()
conn := &connWrapperWithCloseCh{Conn: rawConn, close: grpcsync.NewEvent()}
c.connections = append(c.connections, conn)
return conn, nil, nil
}
func (c *transportRestartCheckCreds) Info() credentials.ProtocolInfo {
return credentials.ProtocolInfo{}
}
func (c *transportRestartCheckCreds) Clone() credentials.TransportCredentials {
return c
}
func (c *transportRestartCheckCreds) OverrideServerName(s string) error {
return nil
}
// Tests that the client transport drains and restarts when next stream ID exceeds
// MaxStreamID. This test also verifies that subsequent RPCs use a new client
// transport and the old transport is closed.
func (s) TestClientTransportRestartsAfterStreamIDExhausted(t *testing.T) {
// Set the transport's MaxStreamID to 4 to cause connection to drain after 2 RPCs.
originalMaxStreamID := transport.MaxStreamID
transport.MaxStreamID = 4
defer func() {
transport.MaxStreamID = originalMaxStreamID
}()
ss := &stubserver.StubServer{
FullDuplexCallF: func(stream testpb.TestService_FullDuplexCallServer) error {
if _, err := stream.Recv(); err != nil {
return status.Errorf(codes.Internal, "unexpected error receiving: %v", err)
}
if err := stream.Send(&testpb.StreamingOutputCallResponse{}); err != nil {
return status.Errorf(codes.Internal, "unexpected error sending: %v", err)
}
if recv, err := stream.Recv(); err != io.EOF {
return status.Errorf(codes.Internal, "Recv = %v, %v; want _, io.EOF", recv, err)
}
return nil
},
}
creds := &transportRestartCheckCreds{}
if err := ss.Start(nil, grpc.WithTransportCredentials(creds)); err != nil {
t.Fatalf("Starting stubServer: %v", err)
}
defer ss.Stop()
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
var streams []testpb.TestService_FullDuplexCallClient
const numStreams = 3
// expected number of conns when each stream is created i.e., 3rd stream is created
// on a new connection.
expectedNumConns := [numStreams]int{1, 1, 2}
// Set up 3 streams.
for i := 0; i < numStreams; i++ {
s, err := ss.Client.FullDuplexCall(ctx)
if err != nil {
t.Fatalf("Creating FullDuplex stream: %v", err)
}
streams = append(streams, s)
// Verify expected num of conns after each stream is created.
if len(creds.connections) != expectedNumConns[i] {
t.Fatalf("Got number of connections created: %v, want: %v", len(creds.connections), expectedNumConns[i])
}
}
// Verify all streams still work.
for i, stream := range streams {
if err := stream.Send(&testpb.StreamingOutputCallRequest{}); err != nil {
t.Fatalf("Sending on stream %d: %v", i, err)
}
if _, err := stream.Recv(); err != nil {
t.Fatalf("Receiving on stream %d: %v", i, err)
}
}
for i, stream := range streams {
if err := stream.CloseSend(); err != nil {
t.Fatalf("CloseSend() on stream %d: %v", i, err)
}
}
// Verifying first connection was closed.
select {
case <-creds.connections[0].close.Done():
case <-ctx.Done():
t.Fatal("Timeout expired when waiting for first client transport to close")
}
}