mirror of
https://github.com/gravitational/teleport.git
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rosstimothy
77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
/*
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* Teleport
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* Copyright (C) 2023 Gravitational, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package lib
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import (
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"context"
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"log/slog"
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"os"
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"os/signal"
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"syscall"
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"time"
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)
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type Terminable interface {
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// Shutdown attempts to gracefully terminate.
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Shutdown(context.Context) error
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// Close does a fast (force) termination.
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Close()
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}
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func ServeSignals(app Terminable, shutdownTimeout time.Duration) {
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ctx := context.Background()
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sigC := make(chan os.Signal, 1)
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signal.Notify(sigC,
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syscall.SIGTERM, // graceful shutdown
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syscall.SIGINT, // graceful-then-fast shutdown
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syscall.SIGUSR1, // capture pprof profiles
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)
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defer signal.Stop(sigC)
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gracefulShutdown := func() {
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tctx, tcancel := context.WithTimeout(ctx, shutdownTimeout)
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defer tcancel()
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slog.InfoContext(tctx, "Attempting graceful shutdown")
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if err := app.Shutdown(tctx); err != nil {
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slog.InfoContext(tctx, "Graceful shutdown failed, attempting fast shutdown")
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app.Close()
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}
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}
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var alreadyInterrupted bool
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for {
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signal := <-sigC
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switch signal {
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case syscall.SIGTERM:
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gracefulShutdown()
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return
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case syscall.SIGINT:
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if alreadyInterrupted {
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app.Close()
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return
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}
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go gracefulShutdown()
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alreadyInterrupted = true
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case syscall.SIGUSR1:
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if p, ok := app.(interface{ Profile() }); ok {
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go p.Profile()
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}
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}
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}
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}
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