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network: ensure server is started and shut down only once

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Use started atomic.Bool field to ensure that the node server shutdown
procedure is executed only once. Prevent the following panic caused by
server double-shutdown in testing code:
```
--- FAIL: TestServerRegisterPeer (0
.06s)
 panic: closed twice
 goroutine 60 [running]:
 testing.tRunner.func1.2({0x104c40b20, 0x104d0ec90})
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1545 +0x1c8
 testing.tRunner.func1()
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1548 +0x360
 panic({0x104c40b20?, 0x104d0ec90?})
 	/opt/homebrew/opt/go/libexec/src/runtime/panic.go:914 +0x218
 github.com/nspcc-dev/neo-go/pkg/network.(*fakeTransp).Close
 (0x14000159e08?)
 	/Users/ekaterinapavlova/Workplace/neo-go/pkg/network
 	/discovery_test.go:83 +0x54
 github.com/nspcc-dev/neo-go/pkg/network.(*Server).Shutdown
 (0x14000343400)
 	/Users/ekaterinapavlova/Workplace/neo-go/pkg/network/server.go:299
 	 +0x104
 github.com/nspcc-dev/neo-go/pkg/network.startWithCleanup.func1()
 	/Users/ekaterinapavlova/Workplace/neo-go/pkg/network/server_test
 	.go:408 +0x20
 testing.(*common).Cleanup.func1()
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1169 +0x110
 testing.(*common).runCleanup(0x1400032c340, 0x14000159d80?)
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1347 +0xd8
 testing.tRunner.func2()
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1589 +0x2c
 testing.tRunner(0x1400032c340, 0x104d0c5d0)
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1601 +0x114
 created by testing.(*T).Run in goroutine 1
 	/opt/homebrew/opt/go/libexec/src/testing/testing.go:1648 +0x33c
```

Signed-off-by: Ekaterina Pavlova <ekt@morphbits.io>
This commit is contained in:
Ekaterina Pavlova 2024-02-18 15:27:52 +03:00
parent 4715e523e0
commit 775c56e87e
2 changed files with 37 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
pkg/network/server.go
View file

@ -138,6 +138,9 @@ type (
stateSync StateSync
log *zap.Logger
// started used to Start and Shutdown server only once.
started atomic.Bool
}
peerDrop struct {
@ -262,8 +265,12 @@ func (s *Server) ID() uint32 {
}
// Start will start the server and its underlying transport. Calling it twice
// is an error. Caller should wait for Start to finish for normal server operation.
// is a no-op. Caller should wait for Start to finish for normal server operation.
func (s *Server) Start() {
if !s.started.CompareAndSwap(false, true) {
s.log.Info("node server already started")
return
}
s.log.Info("node started",
zap.Uint32("blockHeight", s.chain.BlockHeight()),
zap.Uint32("headerHeight", s.chain.HeaderHeight()))
@ -288,9 +295,12 @@ func (s *Server) Start() {
go s.run()
}
// Shutdown disconnects all peers and stops listening. Calling it twice is an error,
// Shutdown disconnects all peers and stops listening. Calling it twice is a no-op,
// once stopped the same intance of the Server can't be started again by calling Start.
func (s *Server) Shutdown() {
if !s.started.CompareAndSwap(true, false) {
return
}
s.log.Info("shutting down server", zap.Int("peers", s.PeerCount()))
for _, tr := range s.transports {
tr.Close()

25
pkg/network/server_test.go
View file

@ -96,10 +96,12 @@ func TestServerStartAndShutdown(t *testing.T) {
require.Eventually(t, func() bool { return 1 == s.PeerCount() }, time.Second, time.Millisecond*10)
assert.True(t, s.transports[0].(*fakeTransp).started.Load())
require.True(t, s.started.Load())
assert.Nil(t, s.txCallback)
s.Shutdown()
require.False(t, s.started.Load())
require.True(t, s.transports[0].(*fakeTransp).closed.Load())
err, ok := p.droppedWith.Load().(error)
require.True(t, ok)
@ -115,11 +117,34 @@ func TestServerStartAndShutdown(t *testing.T) {
s.register <- p
assert.True(t, s.services["fake"].(*fakeConsensus).started.Load())
require.True(t, s.started.Load())
s.Shutdown()
require.False(t, s.started.Load())
require.True(t, s.services["fake"].(*fakeConsensus).stopped.Load())
})
t.Run("double start", func(t *testing.T) {
s := newTestServer(t, ServerConfig{})
startWithCleanup(t, s)
// Attempt to start the server again.
s.Start()
require.True(t, s.started.Load(), "server should still be marked as started after second Start call")
})
t.Run("double shutdown", func(t *testing.T) {
s := newTestServer(t, ServerConfig{})
s.Start()
require.True(t, s.started.Load(), "server should still be marked as started after second Start call")
s.Shutdown()
require.False(t, s.started.Load(), "server should be marked as not started after second Shutdown call")
// Attempt to shutdown the server again.
s.Shutdown()
// Verify the server state remains unchanged and is still considered shutdown.
require.False(t, s.started.Load(), "server should remain shutdown after second call")
})
}
func TestServerRegisterPeer(t *testing.T) {