80 lines
1.0 KiB
Go
80 lines
1.0 KiB
Go
package externalcmd
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import (
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"time"
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)
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const (
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retryPause = 5 * time.Second
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)
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// Environment is a Cmd environment.
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type Environment struct {
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Path string
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Port string
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}
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// Cmd is an external command.
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type Cmd struct {
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cmdstr string
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restart bool
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env Environment
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// in
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terminate chan struct{}
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// out
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done chan struct{}
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}
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// New allocates an Cmd.
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func New(cmdstr string, restart bool, env Environment) *Cmd {
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e := &Cmd{
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cmdstr: cmdstr,
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restart: restart,
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env: env,
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terminate: make(chan struct{}),
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done: make(chan struct{}),
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}
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go e.run()
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return e
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}
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// Close closes an Cmd.
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func (e *Cmd) Close() {
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close(e.terminate)
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<-e.done
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}
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func (e *Cmd) run() {
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defer close(e.done)
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for {
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ok := func() bool {
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ok := e.runInner()
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if !ok {
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return false
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}
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if !e.restart {
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<-e.terminate
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return false
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}
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t := time.NewTimer(retryPause)
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defer t.Stop()
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select {
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case <-t.C:
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return true
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case <-e.terminate:
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return false
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}
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}()
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if !ok {
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break
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}
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}
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}
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