wsclient: Unexpected error while receiving:read ... use of closed network connection

[srikanthccv]

When ws client is stopped, it closes the connection here

opamp-go/client/wsclient.go

Lines 84 to 90 in 06011e4

	c.connMutex.RLock()
	conn := c.conn
	c.connMutex.RUnlock()
	if conn != nil {
	_ = conn.Close()
	}

and cancels the context

opamp-go/client/internal/clientcommon.go

Lines 151 to 156 in 06011e4

	c.isStoppingMutex.Lock()
	cancelFunc := c.runCancel
	c.isStoppingFlag = true
	c.isStoppingMutex.Unlock()
	cancelFunc()

And the ReceiverLoop tries to read a message from the closed connection resulting in an error.

Unexpected error while receiving: read tcp 127.0.0.1:53775->127.0.0.1:53774: use of closed network connection

[portertech]

Running into this one consistently:

2023-11-22T22:18:00.217-0800    ERROR   internal/wsreceiver.go:53       Unexpected error while receiving: read tcp 127.0.0.1:33992->127.0.0.1:4320: use of closed network connection
github.com/open-telemetry/opamp-go/client/internal.(*wsReceiver).ReceiverLoop
        /home/portertech/go/pkg/mod/github.com/open-telemetry/opamp-go@v0.10.0/client/internal/wsreceiver.go:53
github.com/open-telemetry/opamp-go/client.(*wsClient).runOneCycle
        /home/portertech/go/pkg/mod/github.com/open-telemetry/opamp-go@v0.10.0/client/wsclient.go:244
github.com/open-telemetry/opamp-go/client.(*wsClient).runUntilStopped
        /home/portertech/go/pkg/mod/github.com/open-telemetry/opamp-go@v0.10.0/client/wsclient.go:266
github.com/open-telemetry/opamp-go/client/internal.(*ClientCommon).StartConnectAndRun.func1
        /home/portertech/go/pkg/mod/github.com/open-telemetry/opamp-go@v0.10.0/client/internal/clientcommon.go:199