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ping.go
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ping.go
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// Copyright 2020 SEQSENSE, Inc.
//
// 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 tunnel
import (
"sync"
"time"
"golang.org/x/net/websocket"
)
func pingMarshal(v interface{}) (msg []byte, payloadType byte, err error) {
return []byte{}, websocket.PingFrame, nil
}
func pingUnmarshal(msg []byte, payloadType byte, v interface{}) (err error) {
return nil
}
func newPinger(ws *websocket.Conn, period time.Duration) func() {
var doneOnce sync.Once
done := make(chan struct{})
pingMessage := websocket.Codec{Marshal: pingMarshal, Unmarshal: pingUnmarshal}
go func() {
for {
select {
case <-done:
return
case <-time.After(period):
_ = pingMessage.Send(ws, nil)
}
}
}()
return func() {
doneOnce.Do(func() {
close(done)
})
}
}