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package main
import (
"time"
)
type ProcessWatcher struct {
p *Process
t Task
padding int
state chan ProcessState
exitCh chan struct{}
result bool
}
func NewProcessWatcher(t Task, padding int) *ProcessWatcher {
stateCh := make(chan ProcessState, 1)
stateCh <- ProcessStateIdle
return &ProcessWatcher{
t: t,
padding: padding,
state: stateCh,
exitCh: make(chan struct{}),
}
}
func (w *ProcessWatcher) Start() {
s := <-w.state
if s != ProcessStateIdle {
return
}
go w.watch()
w.state <- ProcessStateStarting
w._start()
}
func (w *ProcessWatcher) Stop() {
s := <-w.state
switch s {
case ProcessStateRestarting, ProcessStateRunning:
case ProcessStateIdle:
w.state <- ProcessStateExited
close(w.exitCh)
return
default:
w.state <- s
return
}
w.state <- ProcessStateStopping
w.p.Stop()
}
func (w *ProcessWatcher) Kill() {
s := <-w.state
switch s {
case ProcessStateRestarting, ProcessStateRunning, ProcessStateStopping:
case ProcessStateIdle:
w.state <- ProcessStateExited
close(w.exitCh)
return
default:
w.state <- s
return
}
w.state <- ProcessStateKilling
w.p.Kill()
}
func (w *ProcessWatcher) _start() {
s := <-w.state
switch s {
case ProcessStateStarting, ProcessStateRestarting:
default:
w.state <- s
return
}
proc := NewProcess(w.t, w.padding)
proc.Start()
w.p = proc
w.state <- ProcessStateRunning
go func() {
result := proc.Wait()
s := <-w.state
if s == ProcessStateRestarting {
w.state <- ProcessStateRestarting
go w._start()
return
}
w.result = result
w.state <- ProcessStateExited
close(w.exitCh)
}()
}
func (w *ProcessWatcher) watch() {
wt := Watch(w.t.WatchFiles)
t := time.NewTicker(100 * time.Millisecond)
defer t.Stop()
for {
select {
case <-w.exitCh:
return
case <-t.C:
}
if !wt.Changed() {
continue
}
w._restart()
}
}
func (w *ProcessWatcher) _restart() {
s := <-w.state
if s != ProcessStateRunning {
w.state <- s
return
}
w.p.logAction("Change detected, restarting...")
w.state <- ProcessStateRestarting
w.p.Stop()
}
func (w *ProcessWatcher) Done() bool {
s := <-w.state
w.state <- s
return s == ProcessStateExited
}
func (w *ProcessWatcher) Wait() bool {
<-w.exitCh
return w.result
}
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