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signals.go
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/
signals.go
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package runnable
import (
"context"
"os"
ossignal "os/signal"
"syscall"
)
// Signal returns a runnable that runs the runnable and cancels it when the process receives a POSIX signal.
func Signal(runnable Runnable, signals ...os.Signal) Runnable {
if len(signals) == 0 {
signals = append(signals, syscall.SIGINT)
signals = append(signals, syscall.SIGTERM)
}
return &signal{runnable, signals}
}
type signal struct {
runnable Runnable
signals []os.Signal
}
func (s *signal) Run(ctx context.Context) error {
ctx, cancelFunc := context.WithCancel(ctx)
sigChan := make(chan os.Signal, 1)
ossignal.Notify(sigChan, s.signals...)
go func() {
defer ossignal.Reset(s.signals...)
sig := <-sigChan
Log(s, "received signal %s", sig)
cancelFunc()
}()
return s.runnable.Run(ctx)
}