harness-drone/livelog/sub.go

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2019-02-19 23:56:41 +00:00
// Copyright 2019 Drone.IO Inc. All rights reserved.
// Use of this source code is governed by the Drone Non-Commercial License
// that can be found in the LICENSE file.
package livelog
import (
"sync"
"github.com/drone/drone/core"
)
type subscriber struct {
sync.Mutex
handler chan *core.Line
closec chan struct{}
closed bool
}
func (s *subscriber) publish(line *core.Line) {
select {
case <-s.closec:
case s.handler <- line:
default:
// lines are sent on a buffered channel. If there
// is a slow consumer that is not processing events,
// the buffered channel will fill and newer messages
// are ignored.
}
}
func (s *subscriber) close() {
s.Lock()
if !s.closed {
close(s.closec)
s.closed = true
}
s.Unlock()
}