introduce eventhistory service

Signed-off-by: jkoberg <jkoberg@owncloud.com>

services/eventhistory/pkg/command/health.go

@@ -0,0 +1,18 @@
+package command
+
+import (
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/config"
+	"github.com/urfave/cli/v2"
+)
+
+// Health is the entrypoint for the health command.
+func Health(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "health",
+		Usage: "Check health status",
+		Action: func(c *cli.Context) error {
+			// Not implemented
+			return nil
+		},
+	}
+}

services/eventhistory/pkg/command/root.go

@@ -0,0 +1,59 @@
+package command
+
+import (
+	"context"
+	"os"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/clihelper"
+	ociscfg "github.com/owncloud/ocis/v2/ocis-pkg/config"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/config"
+	"github.com/thejerf/suture/v4"
+	"github.com/urfave/cli/v2"
+)
+
+// GetCommands provides all commands for this service
+func GetCommands(cfg *config.Config) cli.Commands {
+	return []*cli.Command{
+		// start this service
+		Server(cfg),
+
+		// interaction with this service
+
+		// infos about this service
+		Health(cfg),
+		Version(cfg),
+	}
+}
+
+// Execute is the entry point for the eventhistory command.
+func Execute(cfg *config.Config) error {
+	app := clihelper.DefaultApp(&cli.App{
+		Name:     "eventhistory",
+		Usage:    "starts eventhistory service",
+		Commands: GetCommands(cfg),
+	})
+
+	return app.Run(os.Args)
+}
+
+// SutureService allows for the eventhistory command to be embedded and supervised by a suture supervisor tree.
+type SutureService struct {
+	cfg *config.Config
+}
+
+// NewSutureService creates a new eventhistory.SutureService
+func NewSutureService(cfg *ociscfg.Config) suture.Service {
+	cfg.Notifications.Commons = cfg.Commons
+	return SutureService{
+		//cfg: cfg.Notifications,
+	}
+}
+
+func (s SutureService) Serve(ctx context.Context) error {
+	s.cfg.Context = ctx
+	if err := Execute(s.cfg); err != nil {
+		return err
+	}
+
+	return nil
+}

services/eventhistory/pkg/command/server.go

@@ -0,0 +1,85 @@
+package command
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/cs3org/reva/v2/pkg/events/stream"
+	"github.com/oklog/run"
+	"github.com/owncloud/ocis/v2/ocis-pkg/config/configlog"
+	ogrpc "github.com/owncloud/ocis/v2/ocis-pkg/service/grpc"
+	"github.com/owncloud/ocis/v2/ocis-pkg/version"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/config"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/config/parser"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/logging"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/metrics"
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/server/grpc"
+	"github.com/urfave/cli/v2"
+	"go-micro.dev/v4/store"
+)
+
+// Server is the entrypoint for the server command.
+func Server(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "server",
+		Usage:    fmt.Sprintf("start the %s service without runtime (unsupervised mode)", cfg.Service.Name),
+		Category: "server",
+		Before: func(c *cli.Context) error {
+			return configlog.ReturnFatal(parser.ParseConfig(cfg))
+		},
+		Action: func(c *cli.Context) error {
+			logger := logging.Configure(cfg.Service.Name, cfg.Log)
+			err := ogrpc.Configure(ogrpc.GetClientOptions(cfg.GRPCClientTLS)...)
+			if err != nil {
+				return err
+			}
+
+			var (
+				gr          = run.Group{}
+				ctx, cancel = func() (context.Context, context.CancelFunc) {
+					if cfg.Context == nil {
+						return context.WithCancel(context.Background())
+					}
+					return context.WithCancel(cfg.Context)
+				}()
+				metrics = metrics.New()
+			)
+
+			defer cancel()
+
+			metrics.BuildInfo.WithLabelValues(version.GetString()).Set(1)
+
+			consumer, err := stream.NatsFromConfig(stream.NatsConfig(cfg.Events))
+			if err != nil {
+				return err
+			}
+
+			// TODO: configure store
+			st := store.DefaultStore
+
+			service := grpc.NewService(
+				grpc.Logger(logger),
+				grpc.Context(ctx),
+				grpc.Config(cfg),
+				grpc.Name(cfg.Service.Name),
+				grpc.Namespace(cfg.GRPC.Namespace),
+				grpc.Address(cfg.GRPC.Addr),
+				grpc.Metrics(metrics),
+				grpc.Consumer(consumer),
+				grpc.Store(st),
+			)
+
+			gr.Add(service.Run, func(_ error) {
+				logger.Error().
+					Err(err).
+					Str("server", "grpc").
+					Msg("Shutting down server")
+
+				cancel()
+			})
+
+			return gr.Run()
+
+		},
+	}
+}

services/eventhistory/pkg/command/version.go

@@ -0,0 +1,19 @@
+package command
+
+import (
+	"github.com/owncloud/ocis/v2/services/eventhistory/pkg/config"
+	"github.com/urfave/cli/v2"
+)
+
+// Version prints the service versions of all running instances.
+func Version(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "version",
+		Usage:    "print the version of this binary and the running service instances",
+		Category: "info",
+		Action: func(c *cli.Context) error {
+			// not implemented
+			return nil
+		},
+	}
+}