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// Copyright (c) 2019 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package fx
import (
"fmt"
"os"
"syscall"
)
// Shutdowner provides a method that can manually trigger the shutdown of the
// application by sending a signal to all open Done channels. Shutdowner works
// on applications using Run as well as Start, Done, and Stop. The Shutdowner is
// provided to all Fx applications.
type Shutdowner interface {
Shutdown(...ShutdownOption) error
}
// ShutdownOption provides a way to configure properties of the shutdown
// process. Currently, no options have been implemented.
type ShutdownOption interface {
apply(*shutdowner)
}
type shutdowner struct {
app *App
}
// Shutdown broadcasts a signal to all of the application's Done channels
// and begins the Stop process.
func (s *shutdowner) Shutdown(opts ...ShutdownOption) error {
return s.app.broadcastSignal(syscall.SIGTERM)
}
func (app *App) shutdowner() Shutdowner {
return &shutdowner{app: app}
}
func (app *App) broadcastSignal(signal os.Signal) error {
app.donesMu.RLock()
defer app.donesMu.RUnlock()
var unsent int
for _, done := range app.dones {
select {
case done <- signal:
default:
// shutdown called when done channel has already received a
// termination signal that has not been cleared
unsent++
}
}
if unsent != 0 {
return fmt.Errorf("failed to send %v signal to %v out of %v channels",
signal, unsent, len(app.dones),
)
}
return nil
}
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