mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
114 lines
3.2 KiB
Go
114 lines
3.2 KiB
Go
// Copyright 2015 Light Code Labs, LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !windows,!plan9,!nacl,!js
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package caddy
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import (
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"log"
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"os"
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"os/signal"
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"syscall"
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"github.com/mholt/caddy/telemetry"
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)
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// trapSignalsPosix captures POSIX-only signals.
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func trapSignalsPosix() {
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go func() {
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sigchan := make(chan os.Signal, 1)
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signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGUSR1, syscall.SIGUSR2)
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for sig := range sigchan {
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switch sig {
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case syscall.SIGQUIT:
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log.Println("[INFO] SIGQUIT: Quitting process immediately")
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for _, f := range OnProcessExit {
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f() // only perform important cleanup actions
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}
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os.Exit(0)
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case syscall.SIGTERM:
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log.Println("[INFO] SIGTERM: Shutting down servers then terminating")
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exitCode := executeShutdownCallbacks("SIGTERM")
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for _, f := range OnProcessExit {
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f() // only perform important cleanup actions
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}
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err := Stop()
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if err != nil {
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log.Printf("[ERROR] SIGTERM stop: %v", err)
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exitCode = 3
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}
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telemetry.AppendUnique("sigtrap", "SIGTERM")
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go telemetry.StopEmitting() // won't finish in time, but that's OK - just don't block
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os.Exit(exitCode)
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case syscall.SIGUSR1:
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log.Println("[INFO] SIGUSR1: Reloading")
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go telemetry.AppendUnique("sigtrap", "SIGUSR1")
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// Start with the existing Caddyfile
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caddyfileToUse, inst, err := getCurrentCaddyfile()
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if err != nil {
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log.Printf("[ERROR] SIGUSR1: %v", err)
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continue
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}
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if loaderUsed.loader == nil {
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// This also should never happen
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log.Println("[ERROR] SIGUSR1: no Caddyfile loader with which to reload Caddyfile")
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continue
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}
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// Load the updated Caddyfile
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newCaddyfile, err := loaderUsed.loader.Load(inst.serverType)
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if err != nil {
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log.Printf("[ERROR] SIGUSR1: loading updated Caddyfile: %v", err)
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continue
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}
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if newCaddyfile != nil {
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caddyfileToUse = newCaddyfile
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}
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// Backup old event hooks
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oldEventHooks := cloneEventHooks()
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// Purge the old event hooks
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purgeEventHooks()
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// Kick off the restart; our work is done
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EmitEvent(InstanceRestartEvent, nil)
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_, err = inst.Restart(caddyfileToUse)
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if err != nil {
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restoreEventHooks(oldEventHooks)
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log.Printf("[ERROR] SIGUSR1: %v", err)
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}
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case syscall.SIGUSR2:
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log.Println("[INFO] SIGUSR2: Upgrading")
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go telemetry.AppendUnique("sigtrap", "SIGUSR2")
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if err := Upgrade(); err != nil {
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log.Printf("[ERROR] SIGUSR2: upgrading: %v", err)
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}
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case syscall.SIGHUP:
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// ignore; this signal is sometimes sent outside of the user's control
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go telemetry.AppendUnique("sigtrap", "SIGHUP")
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}
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}
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}()
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}
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