refactor accounts

Signed-off-by: Christian Richter <crichter@owncloud.com>

extensions/accounts/pkg/command/server.go

@@ -0,0 +1,104 @@
+package command
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/oklog/run"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/config"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/config/parser"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/logging"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/metrics"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/server/debug"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/server/grpc"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/server/http"
+	svc "github.com/owncloud/ocis/extensions/accounts/pkg/service/v0"
+	"github.com/owncloud/ocis/extensions/accounts/pkg/tracing"
+	"github.com/owncloud/ocis/ocis-pkg/version"
+	"github.com/urfave/cli/v2"
+)
+
+// Server is the entry point for the server command.
+func Server(cfg *config.Config) *cli.Command {
+	return &cli.Command{
+		Name:     "server",
+		Usage:    fmt.Sprintf("start %s extension without runtime (unsupervised mode)", cfg.Service.Name),
+		Category: "server",
+		Before: func(c *cli.Context) error {
+			return parser.ParseConfig(cfg)
+		},
+		Action: func(c *cli.Context) error {
+			logger := logging.Configure(cfg.Service.Name, cfg.Log)
+			err := tracing.Configure(cfg)
+			if err != nil {
+				return err
+			}
+			gr := run.Group{}
+			ctx, cancel := defineContext(cfg)
+			mtrcs := metrics.New()
+
+			defer cancel()
+
+			mtrcs.BuildInfo.WithLabelValues(version.String).Set(1)
+
+			handler, err := svc.New(svc.Logger(logger), svc.Config(cfg))
+			if err != nil {
+				logger.Error().Err(err).Msg("handler init")
+				return err
+			}
+
+			httpServer := http.Server(
+				http.Config(cfg),
+				http.Logger(logger),
+				http.Name(cfg.Service.Name),
+				http.Context(ctx),
+				http.Metrics(mtrcs),
+				http.Handler(handler),
+			)
+
+			gr.Add(httpServer.Run, func(_ error) {
+				logger.Info().Str("server", "http").Msg("shutting down server")
+				cancel()
+			})
+
+			grpcServer := grpc.Server(
+				grpc.Config(cfg),
+				grpc.Logger(logger),
+				grpc.Name(cfg.Service.Name),
+				grpc.Context(ctx),
+				grpc.Metrics(mtrcs),
+				grpc.Handler(handler),
+			)
+
+			gr.Add(grpcServer.Run, func(_ error) {
+				logger.Info().Str("server", "grpc").Msg("shutting down server")
+				cancel()
+			})
+
+			// prepare a debug server and add it to the group run.
+			debugServer, err := debug.Server(debug.Logger(logger), debug.Context(ctx), debug.Config(cfg))
+			if err != nil {
+				logger.Error().Err(err).Str("server", "debug").Msg("Failed to initialize server")
+				return err
+			}
+
+			gr.Add(debugServer.ListenAndServe, func(_ error) {
+				_ = debugServer.Shutdown(ctx)
+				cancel()
+			})
+
+			return gr.Run()
+		},
+	}
+}
+
+// defineContext sets the context for the extension. If there is a context configured it will create a new child from it,
+// if not, it will create a root context that can be cancelled.
+func defineContext(cfg *config.Config) (context.Context, context.CancelFunc) {
+	return func() (context.Context, context.CancelFunc) {
+		if cfg.Context == nil {
+			return context.WithCancel(context.Background())
+		}
+		return context.WithCancel(cfg.Context)
+	}()
+}