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gproc_signal.go
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gproc_signal.go
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// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gproc
import (
"context"
"os"
"os/signal"
"sync"
"syscall"
"github.com/gogf/gf/v2/internal/intlog"
"github.com/gogf/gf/v2/util/gutil"
)
// SigHandler defines a function type for signal handling.
type SigHandler func(sig os.Signal)
var (
// Use internal variable to guarantee concurrent safety
// when multiple Listen happen.
signalChan = make(chan os.Signal, 1)
signalHandlerMu sync.Mutex
signalHandlerMap = make(map[os.Signal][]SigHandler)
shutdownSignalMap = map[os.Signal]struct{}{
syscall.SIGINT: {},
syscall.SIGQUIT: {},
syscall.SIGKILL: {},
syscall.SIGTERM: {},
syscall.SIGABRT: {},
}
)
func init() {
for sig := range shutdownSignalMap {
signalHandlerMap[sig] = make([]SigHandler, 0)
}
}
// AddSigHandler adds custom signal handler for custom one or more signals.
func AddSigHandler(handler SigHandler, signals ...os.Signal) {
signalHandlerMu.Lock()
defer signalHandlerMu.Unlock()
for _, sig := range signals {
signalHandlerMap[sig] = append(signalHandlerMap[sig], handler)
}
}
// AddSigHandlerShutdown adds custom signal handler for shutdown signals:
// syscall.SIGINT,
// syscall.SIGQUIT,
// syscall.SIGKILL,
// syscall.SIGTERM,
// syscall.SIGABRT.
func AddSigHandlerShutdown(handler ...SigHandler) {
signalHandlerMu.Lock()
defer signalHandlerMu.Unlock()
for _, h := range handler {
for sig := range shutdownSignalMap {
signalHandlerMap[sig] = append(signalHandlerMap[sig], h)
}
}
}
// Listen blocks and does signal listening and handling.
func Listen() {
var (
signals = getHandlerSignals()
ctx = context.Background()
wg = sync.WaitGroup{}
sig os.Signal
)
signal.Notify(signalChan, signals...)
for {
sig = <-signalChan
intlog.Printf(ctx, `signal received: %s`, sig.String())
if handlers := getHandlersBySignal(sig); len(handlers) > 0 {
for _, handler := range handlers {
wg.Add(1)
var (
currentHandler = handler
currentSig = sig
)
gutil.TryCatch(ctx, func(ctx context.Context) {
defer wg.Done()
currentHandler(currentSig)
}, func(ctx context.Context, exception error) {
intlog.Errorf(ctx, `execute signal handler failed: %+v`, exception)
})
}
}
// If it is shutdown signal, it exits this signal listening.
if _, ok := shutdownSignalMap[sig]; ok {
intlog.Printf(
ctx,
`receive shutdown signal "%s", waiting all signal handler done`,
sig.String(),
)
// Wait until signal handlers done.
wg.Wait()
intlog.Print(ctx, `all signal handler done, exit process`)
return
}
}
}
func getHandlerSignals() []os.Signal {
signalHandlerMu.Lock()
defer signalHandlerMu.Unlock()
var signals = make([]os.Signal, 0)
for s := range signalHandlerMap {
signals = append(signals, s)
}
return signals
}
func getHandlersBySignal(sig os.Signal) []SigHandler {
signalHandlerMu.Lock()
defer signalHandlerMu.Unlock()
return signalHandlerMap[sig]
}