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caddy/sigtrap.go at master · std-vector/caddy · GitHub
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sigtrap.go
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// 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"
)
// 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"
)
if
PidFile
!=
""
{
os
.
Remove
(
PidFile
)
}
os
.
Exit
(
2
)
}
log
.
Println
(
"[INFO] SIGINT: Shutting down"
)
if
PidFile
!=
""
{
os
.
Remove
(
PidFile
)
}
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
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