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stopsignal.go
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stopsignal.go
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// Copyright 2020 The PipeCD 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 executor
import (
"context"
"go.uber.org/atomic"
)
type StopSignalType string
const (
// StopSignalTerminate means the executor should stop its execution
// because the program was asked to terminate.
StopSignalTerminate StopSignalType = "terminate"
// StopSignalCancel means the executor should stop its execution
// because the deployment was cancelled.
StopSignalCancel StopSignalType = "cancel"
// StopSignalTimeout means the executor should stop its execution
// because of timeout.
StopSignalTimeout StopSignalType = "timeout"
// StopSignalNone means the excutor can be continuously executed.
StopSignalNone StopSignalType = "none"
)
type StopSignal interface {
Context() context.Context
Ch() <-chan StopSignalType
Signal() StopSignalType
Stopped() bool
}
type StopSignalHandler interface {
Cancel()
Timeout()
Terminate()
}
type stopSignal struct {
ctx context.Context
cancel func()
ch chan StopSignalType
signal *atomic.String
}
func NewStopSignal() (StopSignal, StopSignalHandler) {
ctx, cancel := context.WithCancel(context.Background())
s := &stopSignal{
ctx: ctx,
cancel: cancel,
ch: make(chan StopSignalType, 1),
signal: atomic.NewString(string(StopSignalNone)),
}
return s, s
}
func (s *stopSignal) Cancel() {
s.signal.Store(string(StopSignalCancel))
s.cancel()
s.ch <- StopSignalCancel
close(s.ch)
}
func (s *stopSignal) Timeout() {
s.signal.Store(string(StopSignalTimeout))
s.cancel()
s.ch <- StopSignalTimeout
close(s.ch)
}
func (s *stopSignal) Terminate() {
s.signal.Store(string(StopSignalTerminate))
s.cancel()
s.ch <- StopSignalTerminate
close(s.ch)
}
func (s *stopSignal) Context() context.Context {
return s.ctx
}
func (s *stopSignal) Ch() <-chan StopSignalType {
return s.ch
}
func (s *stopSignal) Signal() StopSignalType {
value := s.signal.Load()
return StopSignalType(value)
}
func (s *stopSignal) Stopped() bool {
value := s.signal.Load()
return StopSignalType(value) != StopSignalNone
}