add version command to ocis

ocis/pkg/command/version.go

@@ -0,0 +1,60 @@
+package command
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/micro/cli/v2"
+	mreg "github.com/micro/go-micro/v2/registry"
+	tw "github.com/olekukonko/tablewriter"
+	"github.com/owncloud/ocis/ocis-pkg/registry"
+	"github.com/owncloud/ocis/ocis/pkg/config"
+	"github.com/owncloud/ocis/ocis/pkg/register"
+)
+
+// VersionCommand is the entrypoint for the version command.
+func VersionCommand(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "version",
+		Usage:    "Lists running services with version",
+		Category: "Runtime",
+		Action: func(c *cli.Context) error {
+			reg := *registry.GetRegistry()
+			serviceList, err := reg.ListServices()
+			if err != nil {
+				fmt.Println(fmt.Errorf("could not list services: %v", err))
+				return err
+			}
+
+			var services []*mreg.Service
+			for _, s := range serviceList {
+				s, err := reg.GetService(s.Name)
+				if err != nil {
+					fmt.Println(fmt.Errorf("could not get service: %v", err))
+					return err
+				}
+				services = append(services, s...)
+			}
+
+			if len(services) == 0 {
+				fmt.Println("No running services found.")
+				return nil
+			}
+
+			table := tw.NewWriter(os.Stdout)
+			table.SetHeader([]string{"Version", "Address", "Id"})
+			table.SetAutoFormatHeaders(false)
+			for _, s := range services {
+				for _, n := range s.Nodes {
+					table.Append([]string{s.Version, n.Address, n.Id})
+				}
+			}
+			table.Render()
+			return nil
+		},
+	}
+}
+
+func init() {
+	register.AddCommand(VersionCommand)
+}