⽅法⼀：借助第三⽅的Go包
如果使⽤第三⽅的Go包来实现优雅关闭，⽬前⽤得⽐较多的包是fvbock/endless github.com/fvbock/endl…
⽅法⼆：编码实现
package server
import (
"os"
"os/signal"
)
var onlyOneSignalHandler = make(chan struct{})
var shutdownHandler chan os.Signal
// SetupSignalHandler registered for SIGTERM and SIGINT. A stop channel is returned
// which is closed on one of these signals. If a second signal is caught, the program
// is terminated with exit code 1.
func SetupSignalHandler() <-chan struct{} {
close(onlyOneSignalHandler) // panics when called twice
shutdownHandler = make(chan os.Signal, 2)
stop := make(chan struct{})
signal.Notify(shutdownHandler, shutdownSignals...)
go func() {
<-shutdownHandler
close(stop)
<-shutdownHandler
os.Exit(1) // second signal. Exit directly.
}()
return stop
}
// RequestShutdown emulates a received event that is considered as shutdown signal (SIGTERM/SIGINT)
// This returns whether a handler was notified.
func RequestShutdown() bool {
if shutdownHandler != nil {
select {
case shutdownHandler <- shutdownSignals[0]:
return true
default:
}
}
return false
}
