mirror of
https://github.com/caddyserver/caddy.git
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87 lines
3.1 KiB
Go
87 lines
3.1 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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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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//go:build !windows && !plan9 && !nacl && !js
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package caddy
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import (
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"context"
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"errors"
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"os"
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"os/signal"
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"syscall"
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"github.com/caddyserver/certmagic"
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"go.uber.org/zap"
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)
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// trapSignalsPosix captures POSIX-only signals.
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func trapSignalsPosix() {
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// Ignore all SIGPIPE signals to prevent weird issues with systemd: https://github.com/dunglas/frankenphp/issues/1020
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// Docker/Moby has a similar hack: https://github.com/moby/moby/blob/d828b032a87606ae34267e349bf7f7ccb1f6495a/cmd/dockerd/docker.go#L87-L90
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signal.Ignore(syscall.SIGPIPE)
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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().Info("quitting process immediately", zap.String("signal", "SIGQUIT"))
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certmagic.CleanUpOwnLocks(context.TODO(), Log()) // try to clean up locks anyway, it's important
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os.Exit(ExitCodeForceQuit)
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case syscall.SIGTERM:
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Log().Info("shutting down apps, then terminating", zap.String("signal", "SIGTERM"))
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exitProcessFromSignal("SIGTERM")
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case syscall.SIGUSR1:
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logger := Log().With(zap.String("signal", "SIGUSR1"))
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// If we know the last source config file/adapter (set when starting
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// via `caddy run --config <file> --adapter <adapter>`), attempt
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// to reload from that source. Otherwise, ignore the signal.
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file, adapter, reloadCallback := getLastConfig()
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if file == "" {
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logger.Info("last config unknown, ignored SIGUSR1")
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break
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}
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logger = logger.With(
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zap.String("file", file),
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zap.String("adapter", adapter))
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if reloadCallback == nil {
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logger.Warn("no reload helper available, ignored SIGUSR1")
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break
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}
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logger.Info("reloading config from last-known source")
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if err := reloadCallback(file, adapter); errors.Is(err, errReloadFromSourceUnavailable) {
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// No reload helper available (likely not started via caddy run).
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logger.Warn("reload from source unavailable in this process; ignored SIGUSR1")
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} else if err != nil {
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logger.Error("failed to reload config from file", zap.Error(err))
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} else {
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logger.Info("successfully reloaded config from file")
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}
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case syscall.SIGUSR2:
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Log().Info("not implemented", zap.String("signal", "SIGUSR2"))
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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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Log().Info("not implemented", zap.String("signal", "SIGHUP"))
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}
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}
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}()
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}
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