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forked from ghostunnel/ghostunnel
/
signals.go
74 lines (69 loc) · 2.03 KB
/
signals.go
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/*-
* Copyright 2015 Square Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"io"
"os"
"os/signal"
"sync/atomic"
"syscall"
"time"
)
// signalHandler. Listens for incoming SIGTERM or SIGUSR1 signals. If we get
// SIGTERM, stop listening for new connections and gracefully terminate the
// process. If we get SIGUSR1, reload certificates.
func signalHandler(proxy *proxy, closeables []io.Closer, context *Context) {
signals := make(chan os.Signal)
signal.Notify(signals, syscall.SIGUSR1, syscall.SIGTERM)
defer signal.Stop(signals)
for {
// Wait for a signal
select {
case sig := <-signals:
switch sig {
case syscall.SIGTERM:
logger.Printf("received SIGTERM, shutting down")
time.AfterFunc(*shutdownTimeout, func() {
logger.Printf("graceful shutdown timeout: exiting")
exitFunc(1)
})
atomic.StoreInt32(&proxy.quit, 1)
for _, closeable := range closeables {
closeable.Close()
}
logger.Printf("done with signal handler")
return
case syscall.SIGUSR1:
logger.Printf("received SIGUSR1, reloading certificates")
context.status.Reloading()
err := context.cert.reload()
if err != nil {
logger.Printf("error reloading: %s", err)
}
logger.Printf("reloading complete")
context.status.Listening()
}
case _ = <-context.watcher:
context.status.Reloading()
err := context.cert.reload()
if err != nil {
logger.Printf("error reloading: %s", err)
}
logger.Printf("reloading complete")
context.status.Listening()
}
}
}