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sigint.go
47 lines (39 loc) · 904 Bytes
/
sigint.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package fncobra
import (
"context"
"os"
"os/signal"
"time"
"go.uber.org/atomic"
)
func WithSigIntCancel(ctx context.Context) (context.Context, func()) {
ctx, cancel := context.WithCancel(ctx)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
defer signal.Stop(c)
cancelled := atomic.NewBool(false)
for {
select {
case <-c:
if cancelled.CAS(false, true) {
cancel()
// Give cleanups a moment to run, and then force exit.
go func() {
time.Sleep(2 * time.Second)
os.Exit(2)
}()
} else {
// Already cancelled, exit immediately.
os.Exit(3)
}
case <-ctx.Done():
return
}
}
}()
return ctx, cancel
}