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sigtrap_posix.go
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sigtrap_posix.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.
// +build !windows,!plan9,!nacl
package caddy
import (
"log"
"os"
"os/signal"
"syscall"
"github.com/mholt/caddy/telemetry"
)
// trapSignalsPosix captures POSIX-only signals.
func trapSignalsPosix() {
go func() {
sigchan := make(chan os.Signal, 1)
signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGUSR1, syscall.SIGUSR2)
for sig := range sigchan {
switch sig {
case syscall.SIGQUIT:
log.Println("[INFO] SIGQUIT: Quitting process immediately")
for _, f := range OnProcessExit {
f() // only perform important cleanup actions
}
os.Exit(0)
case syscall.SIGTERM:
log.Println("[INFO] SIGTERM: Shutting down servers then terminating")
exitCode := executeShutdownCallbacks("SIGTERM")
for _, f := range OnProcessExit {
f() // only perform important cleanup actions
}
err := Stop()
if err != nil {
log.Printf("[ERROR] SIGTERM stop: %v", err)
exitCode = 3
}
telemetry.AppendUnique("sigtrap", "SIGTERM")
go telemetry.StopEmitting() // won't finish in time, but that's OK - just don't block
os.Exit(exitCode)
case syscall.SIGUSR1:
log.Println("[INFO] SIGUSR1: Reloading")
go telemetry.AppendUnique("sigtrap", "SIGUSR1")
// Start with the existing Caddyfile
caddyfileToUse, inst, err := getCurrentCaddyfile()
if err != nil {
log.Printf("[ERROR] SIGUSR1: %v", err)
continue
}
if loaderUsed.loader == nil {
// This also should never happen
log.Println("[ERROR] SIGUSR1: no Caddyfile loader with which to reload Caddyfile")
continue
}
// Load the updated Caddyfile
newCaddyfile, err := loaderUsed.loader.Load(inst.serverType)
if err != nil {
log.Printf("[ERROR] SIGUSR1: loading updated Caddyfile: %v", err)
continue
}
if newCaddyfile != nil {
caddyfileToUse = newCaddyfile
}
// Backup old event hooks
oldEventHooks := cloneEventHooks()
// Purge the old event hooks
purgeEventHooks()
// Kick off the restart; our work is done
_, err = inst.Restart(caddyfileToUse)
if err != nil {
restoreEventHooks(oldEventHooks)
log.Printf("[ERROR] SIGUSR1: %v", err)
}
case syscall.SIGUSR2:
log.Println("[INFO] SIGUSR2: Upgrading")
go telemetry.AppendUnique("sigtrap", "SIGUSR2")
if err := Upgrade(); err != nil {
log.Printf("[ERROR] SIGUSR2: upgrading: %v", err)
}
case syscall.SIGHUP:
// ignore; this signal is sometimes sent outside of the user's control
go telemetry.AppendUnique("sigtrap", "SIGHUP")
}
}
}()
}