Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

cmd/server.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/cloudreve/Cloudreve/v4/application"
+	"github.com/cloudreve/Cloudreve/v4/application/constants"
+	"github.com/cloudreve/Cloudreve/v4/application/dependency"
+	"github.com/cloudreve/Cloudreve/v4/pkg/logging"
+	"github.com/spf13/cobra"
+)
+
+var (
+	licenseKey string
+)
+
+func init() {
+	rootCmd.AddCommand(serverCmd)
+	serverCmd.PersistentFlags().StringVarP(&licenseKey, "license-key", "l", "", "License key of your Cloudreve Pro")
+}
+
+var serverCmd = &cobra.Command{
+	Use:   "server",
+	Short: "Start a Cloudreve server with the given config file",
+	Run: func(cmd *cobra.Command, args []string) {
+		dep := dependency.NewDependency(
+			dependency.WithConfigPath(confPath),
+			dependency.WithProFlag(constants.IsProBool),
+			dependency.WithRequiredDbVersion(constants.BackendVersion),
+			dependency.WithLicenseKey(licenseKey),
+		)
+		server := application.NewServer(dep)
+		logger := dep.Logger()
+
+		server.PrintBanner()
+
+		// Graceful shutdown after received signal.
+		sigChan := make(chan os.Signal, 1)
+		signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT)
+		go shutdown(sigChan, logger, server)
+
+		if err := server.Start(); err != nil {
+			logger.Error("Failed to start server: %s", err)
+			os.Exit(1)
+		}
+
+		defer func() {
+			<-sigChan
+		}()
+	},
+}
+
+func shutdown(sigChan chan os.Signal, logger logging.Logger, server application.Server) {
+	sig := <-sigChan
+	logger.Info("Signal %s received, shutting down server...", sig)
+	server.Close()
+	close(sigChan)
+}