Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/cmd/mattermost/commands/server.go

@@ -0,0 +1,152 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package commands
+
+import (
+	"bytes"
+	"net"
+	"os"
+	"os/signal"
+	"runtime/debug"
+	"runtime/pprof"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+
+	"github.com/mattermost/mattermost-server/v6/server/channels/api4"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/manualtesting"
+	"github.com/mattermost/mattermost-server/v6/server/channels/utils"
+	"github.com/mattermost/mattermost-server/v6/server/channels/web"
+	"github.com/mattermost/mattermost-server/v6/server/channels/wsapi"
+	"github.com/mattermost/mattermost-server/v6/server/config"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/mlog"
+)
+
+var serverCmd = &cobra.Command{
+	Use:          "server",
+	Short:        "Run the Mattermost server",
+	RunE:         serverCmdF,
+	SilenceUsage: true,
+}
+
+func init() {
+	RootCmd.AddCommand(serverCmd)
+	RootCmd.RunE = serverCmdF
+}
+
+func serverCmdF(command *cobra.Command, args []string) error {
+	interruptChan := make(chan os.Signal, 1)
+
+	if err := utils.TranslationsPreInit(); err != nil {
+		return errors.Wrap(err, "unable to load Mattermost translation files")
+	}
+
+	customDefaults, err := loadCustomDefaults()
+	if err != nil {
+		mlog.Warn("Error loading custom configuration defaults: " + err.Error())
+	}
+
+	configStore, err := config.NewStoreFromDSN(getConfigDSN(command, config.GetEnvironment()), false, customDefaults, true)
+	if err != nil {
+		return errors.Wrap(err, "failed to load configuration")
+	}
+	defer configStore.Close()
+
+	return runServer(configStore, interruptChan)
+}
+
+func runServer(configStore *config.Store, interruptChan chan os.Signal) error {
+	// Setting the highest traceback level from the code.
+	// This is done to print goroutines from all threads (see golang.org/issue/13161)
+	// and also preserve a crash dump for later investigation.
+	debug.SetTraceback("crash")
+
+	options := []app.Option{
+		// The option order is important as app.Config option reads app.StartMetrics option.
+		app.StartMetrics,
+		app.ConfigStore(configStore),
+		app.RunEssentialJobs,
+		app.JoinCluster,
+	}
+	server, err := app.NewServer(options...)
+	if err != nil {
+		mlog.Error(err.Error())
+		return err
+	}
+	defer server.Shutdown()
+	// We add this after shutdown so that it can be called
+	// before server shutdown happens as it can close
+	// the advanced logger and prevent the mlog call from working properly.
+	defer func() {
+		// A panic pass-through layer which just logs it
+		// and sends it upwards.
+		if x := recover(); x != nil {
+			var buf bytes.Buffer
+			pprof.Lookup("goroutine").WriteTo(&buf, 2)
+			mlog.Error("A panic occurred",
+				mlog.Any("error", x),
+				mlog.String("stack", buf.String()))
+			panic(x)
+		}
+	}()
+
+	api, err := api4.Init(server)
+	if err != nil {
+		mlog.Error(err.Error())
+		return err
+	}
+	wsapi.Init(server)
+	web.New(server)
+
+	err = server.Start()
+	if err != nil {
+		mlog.Error(err.Error())
+		return err
+	}
+
+	// If we allow testing then listen for manual testing URL hits
+	if *server.Config().ServiceSettings.EnableTesting {
+		manualtesting.Init(api)
+	}
+
+	notifyReady()
+
+	// wait for kill signal before attempting to gracefully shutdown
+	// the running service
+	signal.Notify(interruptChan, syscall.SIGINT, syscall.SIGTERM)
+	<-interruptChan
+
+	return nil
+}
+
+func notifyReady() {
+	// If the environment vars provide a systemd notification socket,
+	// notify systemd that the server is ready.
+	systemdSocket := os.Getenv("NOTIFY_SOCKET")
+	if systemdSocket != "" {
+		mlog.Info("Sending systemd READY notification.")
+
+		err := sendSystemdReadyNotification(systemdSocket)
+		if err != nil {
+			mlog.Error(err.Error())
+		}
+	}
+}
+
+func sendSystemdReadyNotification(socketPath string) error {
+	msg := "READY=1"
+	addr := &net.UnixAddr{
+		Name: socketPath,
+		Net:  "unixgram",
+	}
+	conn, err := net.DialUnix(addr.Net, nil, addr)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	_, err = conn.Write([]byte(msg))
+	return err
+}