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// Copyright 2021 The gVisor 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 connection_test
import (
"reflect"
"testing"
"golang.org/x/sys/unix"
"gvisor.dev/gvisor/pkg/lisafs"
"gvisor.dev/gvisor/pkg/sync"
"gvisor.dev/gvisor/pkg/unet"
)
const (
dynamicMsgID = lisafs.Channel + 1
versionMsgID = dynamicMsgID + 1
)
var handlers = [...]lisafs.RPCHandler{
lisafs.Error: lisafs.ErrorHandler,
lisafs.Mount: lisafs.MountHandler,
lisafs.Channel: lisafs.ChannelHandler,
dynamicMsgID: dynamicMsgHandler,
versionMsgID: versionHandler,
}
// testServer implements lisafs.ServerImpl.
type testServer struct {
lisafs.Server
}
var _ lisafs.ServerImpl = (*testServer)(nil)
type testControlFD struct {
lisafs.ControlFD
lisafs.ControlFDImpl
}
func (fd *testControlFD) FD() *lisafs.ControlFD {
return &fd.ControlFD
}
// Mount implements lisafs.Mount.
func (s *testServer) Mount(c *lisafs.Connection, mountPath string) (lisafs.ControlFDImpl, lisafs.Inode, error) {
return &testControlFD{}, lisafs.Inode{ControlFD: 1}, nil
}
// MaxMessageSize implements lisafs.MaxMessageSize.
func (s *testServer) MaxMessageSize() uint32 {
return lisafs.MaxMessageSize()
}
// SupportedMessages implements lisafs.ServerImpl.SupportedMessages.
func (s *testServer) SupportedMessages() []lisafs.MID {
return []lisafs.MID{
lisafs.Mount,
lisafs.Channel,
dynamicMsgID,
versionMsgID,
}
}
func runServerClient(t testing.TB, clientFn func(c *lisafs.Client)) {
serverSocket, clientSocket, err := unet.SocketPair(false)
if err != nil {
t.Fatalf("socketpair got err %v expected nil", err)
}
ts := &testServer{}
ts.Server.InitTestOnly(ts, handlers[:])
conn, err := ts.CreateConnection(serverSocket, false /* readonly */)
if err != nil {
t.Fatalf("starting connection failed: %v", err)
return
}
ts.StartConnection(conn)
c, _, err := lisafs.NewClient(clientSocket, "/")
if err != nil {
t.Fatalf("client creation failed: %v", err)
}
clientFn(c)
c.Close() // This should trigger client and server shutdown.
ts.Wait()
}
// TestStartUp tests that the server and client can be started up correctly.
func TestStartUp(t *testing.T) {
runServerClient(t, func(c *lisafs.Client) {
if c.IsSupported(lisafs.Error) {
t.Errorf("sending error messages should not be supported")
}
})
}
func TestUnsupportedMessage(t *testing.T) {
unsupportedM := lisafs.MID(len(handlers))
runServerClient(t, func(c *lisafs.Client) {
if err := c.SndRcvMessage(unsupportedM, 0, lisafs.NoopMarshal, lisafs.NoopUnmarshal, nil); err != unix.EOPNOTSUPP {
t.Errorf("expected EOPNOTSUPP but got err: %v", err)
}
})
}
func dynamicMsgHandler(c *lisafs.Connection, comm lisafs.Communicator, payloadLen uint32) (uint32, error) {
var req lisafs.MsgDynamic
req.UnmarshalBytes(comm.PayloadBuf(payloadLen))
// Just echo back the message.
respPayloadLen := uint32(req.SizeBytes())
req.MarshalBytes(comm.PayloadBuf(respPayloadLen))
return respPayloadLen, nil
}
// TestStress stress tests sending many messages from various goroutines.
func TestStress(t *testing.T) {
runServerClient(t, func(c *lisafs.Client) {
concurrency := 8
numMsgPerGoroutine := 5000
var clientWg sync.WaitGroup
for i := 0; i < concurrency; i++ {
clientWg.Add(1)
go func() {
defer clientWg.Done()
for j := 0; j < numMsgPerGoroutine; j++ {
// Create a massive random message.
var req lisafs.MsgDynamic
req.Randomize(100)
var resp lisafs.MsgDynamic
if err := c.SndRcvMessage(dynamicMsgID, uint32(req.SizeBytes()), req.MarshalBytes, resp.UnmarshalBytes, nil); err != nil {
t.Errorf("SndRcvMessage: received unexpected error %v", err)
return
}
if !reflect.DeepEqual(&req, &resp) {
t.Errorf("response should be the same as request: request = %+v, response = %+v", req, resp)
}
}
}()
}
clientWg.Wait()
})
}
func versionHandler(c *lisafs.Connection, comm lisafs.Communicator, payloadLen uint32) (uint32, error) {
// To be fair, usually handlers will create their own objects and return a
// pointer to those. Might be tempting to reuse above variables, but don't.
var rv lisafs.P9Version
rv.UnmarshalBytes(comm.PayloadBuf(payloadLen))
// Create a new response.
sv := lisafs.P9Version{
MSize: rv.MSize,
Version: "9P2000.L.Google.11",
}
respPayloadLen := uint32(sv.SizeBytes())
sv.MarshalBytes(comm.PayloadBuf(respPayloadLen))
return respPayloadLen, nil
}
// BenchmarkSendRecv exists to compete against p9's BenchmarkSendRecvChannel.
func BenchmarkSendRecv(b *testing.B) {
b.ReportAllocs()
sendV := lisafs.P9Version{
MSize: 1 << 20,
Version: "9P2000.L.Google.12",
}
var recvV lisafs.P9Version
runServerClient(b, func(c *lisafs.Client) {
for i := 0; i < b.N; i++ {
if err := c.SndRcvMessage(versionMsgID, uint32(sendV.SizeBytes()), sendV.MarshalBytes, recvV.UnmarshalBytes, nil); err != nil {
b.Fatalf("unexpected error occurred: %v", err)
}
}
})
}
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