mirror of
https://github.com/caddyserver/caddy.git
synced 2024-11-22 06:51:30 +08:00
109 lines
3.2 KiB
Go
109 lines
3.2 KiB
Go
// Copyright 2015 Light Code Labs, LLC
|
|
//
|
|
// 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 caddy
|
|
|
|
import (
|
|
"log"
|
|
"os"
|
|
"os/signal"
|
|
"sync"
|
|
|
|
"github.com/caddyserver/caddy/telemetry"
|
|
)
|
|
|
|
// TrapSignals create signal handlers for all applicable signals for this
|
|
// system. If your Go program uses signals, this is a rather invasive
|
|
// function; best to implement them yourself in that case. Signals are not
|
|
// required for the caddy package to function properly, but this is a
|
|
// convenient way to allow the user to control this part of your program.
|
|
func TrapSignals() {
|
|
trapSignalsCrossPlatform()
|
|
trapSignalsPosix()
|
|
}
|
|
|
|
// trapSignalsCrossPlatform captures SIGINT, which triggers forceful
|
|
// shutdown that executes shutdown callbacks first. A second interrupt
|
|
// signal will exit the process immediately.
|
|
func trapSignalsCrossPlatform() {
|
|
go func() {
|
|
shutdown := make(chan os.Signal, 1)
|
|
signal.Notify(shutdown, os.Interrupt)
|
|
|
|
for i := 0; true; i++ {
|
|
<-shutdown
|
|
|
|
if i > 0 {
|
|
log.Println("[INFO] SIGINT: Force quit")
|
|
for _, f := range OnProcessExit {
|
|
f() // important cleanup actions only
|
|
}
|
|
os.Exit(2)
|
|
}
|
|
|
|
log.Println("[INFO] SIGINT: Shutting down")
|
|
|
|
telemetry.AppendUnique("sigtrap", "SIGINT")
|
|
go telemetry.StopEmitting() // not guaranteed to finish in time; that's OK (just don't block!)
|
|
|
|
// important cleanup actions before shutdown callbacks
|
|
for _, f := range OnProcessExit {
|
|
f()
|
|
}
|
|
|
|
go func() {
|
|
os.Exit(executeShutdownCallbacks("SIGINT"))
|
|
}()
|
|
}
|
|
}()
|
|
}
|
|
|
|
// executeShutdownCallbacks executes the shutdown callbacks as initiated
|
|
// by signame. It logs any errors and returns the recommended exit status.
|
|
// This function is idempotent; subsequent invocations always return 0.
|
|
func executeShutdownCallbacks(signame string) (exitCode int) {
|
|
shutdownCallbacksOnce.Do(func() {
|
|
// execute third-party shutdown hooks
|
|
EmitEvent(ShutdownEvent, signame)
|
|
|
|
errs := allShutdownCallbacks()
|
|
if len(errs) > 0 {
|
|
for _, err := range errs {
|
|
log.Printf("[ERROR] %s shutdown: %v", signame, err)
|
|
}
|
|
exitCode = 4
|
|
}
|
|
})
|
|
return
|
|
}
|
|
|
|
// allShutdownCallbacks executes all the shutdown callbacks
|
|
// for all the instances, and returns all the errors generated
|
|
// during their execution. An error executing one shutdown
|
|
// callback does not stop execution of others. Only one shutdown
|
|
// callback is executed at a time.
|
|
func allShutdownCallbacks() []error {
|
|
var errs []error
|
|
instancesMu.Lock()
|
|
for _, inst := range instances {
|
|
errs = append(errs, inst.ShutdownCallbacks()...)
|
|
}
|
|
instancesMu.Unlock()
|
|
return errs
|
|
}
|
|
|
|
// shutdownCallbacksOnce ensures that shutdown callbacks
|
|
// for all instances are only executed once.
|
|
var shutdownCallbacksOnce sync.Once
|