add version command and add build information to metrics

Signed-off-by: David Christofas <dchristofas@owncloud.com>

ocis/pkg/command/ocs.go

@@ -4,6 +4,7 @@ package command
 
 import (
 	"github.com/micro/cli/v2"
+	"github.com/owncloud/ocis/ocis/pkg/version"
 	"github.com/owncloud/ocis/ocs/pkg/command"
 	svcconfig "github.com/owncloud/ocis/ocs/pkg/config"
 	"github.com/owncloud/ocis/ocs/pkg/flagset"
@@ -18,6 +19,9 @@ func OCSCommand(cfg *config.Config) *cli.Command {
 		Usage:    "Start ocs server",
 		Category: "Extensions",
 		Flags:    flagset.ServerWithConfig(cfg.OCS),
+		Subcommands: []*cli.Command{
+			command.PrintVersion(cfg.OCS),
+		},
 		Action: func(ctx *cli.Context) error {
 			ocsCommand := command.Server(configureOCS(cfg))
 
@@ -34,6 +38,7 @@ func configureOCS(cfg *config.Config) *svcconfig.Config {
 	cfg.OCS.Log.Level = cfg.Log.Level
 	cfg.OCS.Log.Pretty = cfg.Log.Pretty
 	cfg.OCS.Log.Color = cfg.Log.Color
+	cfg.OCS.Service.Version = version.String
 
 	if cfg.Tracing.Enabled {
 		cfg.OCS.Tracing.Enabled = cfg.Tracing.Enabled

ocs/changelog/unreleased/add-version-command.md

@@ -0,0 +1,6 @@
+Enhancement: Add version command
+
+Added a command to list the currently running services with their respective version.
+Also added a metrics entry for build information which includes the service version.
+
+https://github.com/owncloud/product/issues/226

ocs/pkg/command/root.go

@@ -32,12 +32,14 @@ func Execute() error {
 		Flags: flagset.RootWithConfig(cfg),
 
 		Before: func(c *cli.Context) error {
+			cfg.Service.Version = version.String
 			return ParseConfig(c, cfg)
 		},
 
 		Commands: []*cli.Command{
 			Server(cfg),
 			Health(cfg),
+			PrintVersion(cfg),
 		},
 	}
 

ocs/pkg/command/server.go

@@ -135,6 +135,8 @@ func Server(cfg *config.Config) *cli.Command {
 
 			defer cancel()
 
+			metrics.BuildInfo.WithLabelValues(cfg.Service.Version).Set(1)
+
 			{
 				server, err := http.Server(
 					http.Logger(logger),

ocs/pkg/command/version.go

@@ -0,0 +1,45 @@
+package command
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/micro/cli/v2"
+	"github.com/micro/go-micro/v2/registry/mdns"
+	tw "github.com/olekukonko/tablewriter"
+	"github.com/owncloud/ocis/ocs/pkg/config"
+	"github.com/owncloud/ocis/ocs/pkg/flagset"
+)
+
+// PrintVersion prints the service versions of all running instances.
+func PrintVersion(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "version",
+		Usage: "Print the versions of the running instances",
+		Flags: flagset.ListOcsWithConfig(cfg),
+		Action: func(c *cli.Context) error {
+			reg := mdns.NewRegistry()
+			services, err := reg.GetService(cfg.Service.Namespace + "." + cfg.Service.Name)
+			if err != nil {
+				fmt.Println(fmt.Errorf("could not get ocs services from the registry: %v", err))
+				return err
+			}
+
+			if len(services) == 0 {
+				fmt.Println("No running ocs service 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
+		},
+	}
+}

ocs/pkg/config/config.go

@@ -17,9 +17,15 @@ type Debug struct {
 
 // HTTP defines the available http configuration.
 type HTTP struct {
-	Addr      string
+	Addr string
+	Root string
+}
+
+// Service defines the available service configuration.
+type Service struct {
+	Name      string
 	Namespace string
-	Root      string
+	Version   string
 }
 
 // Tracing defines the available tracing configuration.
@@ -44,6 +50,7 @@ type Config struct {
 	HTTP         HTTP
 	Tracing      Tracing
 	TokenManager TokenManager
+	Service      Service
 }
 
 // New initializes a new configuration with or without defaults.

ocs/pkg/flagset/flagset.go

@@ -128,7 +128,14 @@ func ServerWithConfig(cfg *config.Config) []cli.Flag {
 			Value:       "com.owncloud.web",
 			Usage:       "Set the base namespace for the http namespace",
 			EnvVars:     []string{"OCS_NAMESPACE"},
-			Destination: &cfg.HTTP.Namespace,
+			Destination: &cfg.Service.Namespace,
+		},
+		&cli.StringFlag{
+			Name:        "name",
+			Value:       "ocs",
+			Usage:       "Service name",
+			EnvVars:     []string{"OCS_NAME"},
+			Destination: &cfg.Service.Name,
 		},
 		&cli.StringFlag{
 			Name:        "http-root",
@@ -147,3 +154,23 @@ func ServerWithConfig(cfg *config.Config) []cli.Flag {
 		},
 	}
 }
+
+// ListOcsWithConfig applies the config to the list commands flagset.
+func ListOcsWithConfig(cfg *config.Config) []cli.Flag {
+	return []cli.Flag{
+		&cli.StringFlag{
+			Name:        "http-namespace",
+			Value:       "com.owncloud.web",
+			Usage:       "Set the base namespace for the http namespace",
+			EnvVars:     []string{"OCS_NAMESPACE"},
+			Destination: &cfg.Service.Namespace,
+		},
+		&cli.StringFlag{
+			Name:        "name",
+			Value:       "ocs",
+			Usage:       "Service name",
+			EnvVars:     []string{"OCS_NAME"},
+			Destination: &cfg.Service.Name,
+		},
+	}
+}

ocs/pkg/metrics/metrics.go

@@ -1,5 +1,7 @@
 package metrics
 
+import "github.com/prometheus/client_golang/prometheus"
+
 var (
 	// Namespace defines the namespace for the defines metrics.
 	Namespace = "ocis"
@@ -11,6 +13,7 @@ var (
 // Metrics defines the available metrics of this service.
 type Metrics struct {
 	// Counter  *prometheus.CounterVec
+	BuildInfo *prometheus.GaugeVec
 }
 
 // New initializes the available metrics.
@@ -22,11 +25,21 @@ func New() *Metrics {
 		// 	Name:      "greet_total",
 		// 	Help:      "How many greeting requests processed",
 		// }, []string{}),
+		BuildInfo: prometheus.NewGaugeVec(prometheus.GaugeOpts{
+			Namespace: Namespace,
+			Subsystem: Subsystem,
+			Name:      "build_info",
+			Help:      "Build Information",
+		}, []string{"version"}),
 	}
 
 	// prometheus.Register(
 	// 	m.Counter,
 	// )
 
+	_ = prometheus.Register(
+		m.BuildInfo,
+	)
+
 	return m
 }

ocs/pkg/server/debug/server.go

@@ -4,9 +4,8 @@ import (
 	"io"
 	"net/http"
 
-	"github.com/owncloud/ocis/ocs/pkg/config"
-	"github.com/owncloud/ocis/ocs/pkg/version"
 	"github.com/owncloud/ocis/ocis-pkg/service/debug"
+	"github.com/owncloud/ocis/ocs/pkg/config"
 )
 
 // Server initializes the debug service and server.
@@ -15,8 +14,8 @@ func Server(opts ...Option) (*http.Server, error) {
 
 	return debug.NewService(
 		debug.Logger(options.Logger),
-		debug.Name("ocs"),
+		debug.Name(options.Config.Service.Name),
-		debug.Version(version.String),
+		debug.Version(options.Config.Service.Version),
 		debug.Address(options.Config.Debug.Addr),
 		debug.Token(options.Config.Debug.Token),
 		debug.Pprof(options.Config.Debug.Pprof),

ocs/pkg/server/http/server.go

@@ -1,10 +1,9 @@
 package http
 
 import (
-	svc "github.com/owncloud/ocis/ocs/pkg/service/v0"
-	"github.com/owncloud/ocis/ocs/pkg/version"
 	"github.com/owncloud/ocis/ocis-pkg/middleware"
 	"github.com/owncloud/ocis/ocis-pkg/service/http"
+	svc "github.com/owncloud/ocis/ocs/pkg/service/v0"
 )
 
 // Server initializes the http service and server.
@@ -13,9 +12,9 @@ func Server(opts ...Option) (http.Service, error) {
 
 	service := http.NewService(
 		http.Logger(options.Logger),
-		http.Name("ocs"),
+		http.Name(options.Config.Service.Name),
-		http.Version(version.String),
+		http.Version(options.Config.Service.Version),
-		http.Namespace(options.Config.HTTP.Namespace),
+		http.Namespace(options.Config.Service.Namespace),
 		http.Address(options.Config.HTTP.Addr),
 		http.Context(options.Context),
 		http.Flags(options.Flags...),
@@ -31,8 +30,8 @@ func Server(opts ...Option) (http.Service, error) {
 			middleware.Cors,
 			middleware.Secure,
 			middleware.Version(
-				"ocs",
+				options.Config.Service.Name,
-				version.String,
+				options.Config.Service.Version,
 			),
 			middleware.Logger(
 				options.Logger,