mirror of https://github.com/minio/minio.git
123 lines
3.5 KiB
Go
123 lines
3.5 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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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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*/
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package cmd
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import (
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"os"
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"os/exec"
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"syscall"
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"time"
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)
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// Type of service signals currently supported.
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type serviceSignal int
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const (
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serviceStatus = iota // Gets status about the service.
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serviceRestart // Restarts the service.
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serviceStop // Stops the server.
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// Add new service requests here.
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)
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// Global service signal channel.
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var globalServiceSignalCh chan serviceSignal
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// Global service done channel.
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var globalServiceDoneCh chan struct{}
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// Initialize service mutex once.
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func init() {
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globalServiceDoneCh = make(chan struct{}, 1)
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globalServiceSignalCh = make(chan serviceSignal)
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}
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// restartProcess starts a new process passing it the active fd's. It
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// doesn't fork, but starts a new process using the same environment and
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// arguments as when it was originally started. This allows for a newly
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// deployed binary to be started. It returns the pid of the newly started
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// process when successful.
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func restartProcess() error {
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// Use the original binary location. This works with symlinks such that if
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// the file it points to has been changed we will use the updated symlink.
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argv0, err := exec.LookPath(os.Args[0])
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if err != nil {
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return err
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}
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// Pass on the environment and replace the old count key with the new one.
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cmd := exec.Command(argv0, os.Args[1:]...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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return cmd.Start()
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}
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// Handles all serviceSignal and execute service functions.
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func (m *ServerMux) handleServiceSignals() error {
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// Custom exit function
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runExitFn := func(err error) {
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// If global profiler is set stop before we exit.
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if globalProfiler != nil {
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globalProfiler.Stop()
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}
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// Call user supplied user exit function
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fatalIf(err, "Unable to gracefully complete service operation.")
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// We are usually done here, close global service done channel.
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globalServiceDoneCh <- struct{}{}
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}
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// Wait for SIGTERM in a go-routine.
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trapCh := signalTrap(os.Interrupt, syscall.SIGTERM)
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go func(trapCh <-chan bool) {
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<-trapCh
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globalServiceSignalCh <- serviceStop
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}(trapCh)
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// Start listening on service signal. Monitor signals.
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for {
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signal := <-globalServiceSignalCh
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switch signal {
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case serviceStatus:
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/// We don't do anything for this.
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case serviceRestart:
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if err := m.Close(); err != nil {
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errorIf(err, "Unable to close server gracefully")
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}
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if err := restartProcess(); err != nil {
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errorIf(err, "Unable to restart the server.")
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}
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runExitFn(nil)
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case serviceStop:
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log.Println("Received signal to exit.")
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go func() {
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time.Sleep(serverShutdownPoll + time.Millisecond*100)
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log.Println("Waiting for active connections to terminate - press Ctrl+C to quit immediately.")
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}()
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if err := m.Close(); err != nil {
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errorIf(err, "Unable to close server gracefully")
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}
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objAPI := newObjectLayerFn()
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if objAPI == nil {
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// Server not initialized yet, exit happily.
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runExitFn(nil)
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} else {
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runExitFn(objAPI.Shutdown())
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}
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}
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}
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}
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