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package run
import (
"context"
"fmt"
"os"
"os/signal"
)
// SignalHandler returns an actor, i.e. an execute and interrupt func, that
// terminates with SignalError when the process receives one of the provided
// signals, or the parent context is canceled.
func SignalHandler(ctx context.Context, signals ...os.Signal) (execute func() error, interrupt func(error)) {
ctx, cancel := context.WithCancel(ctx)
return func() error {
c := make(chan os.Signal, 1)
signal.Notify(c, signals...)
select {
case sig := <-c:
return SignalError{Signal: sig}
case <-ctx.Done():
return ctx.Err()
}
}, func(error) {
cancel()
}
}
// SignalError is returned by the signal handler's execute function
// when it terminates due to a received signal.
type SignalError struct {
Signal os.Signal
}
// Error implements the error interface.
func (e SignalError) Error() string {
return fmt.Sprintf("received signal %s", e.Signal)
}
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