refactor web

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

extensions/web/pkg/command/server.go

@@ -0,0 +1,119 @@
+package command
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+
+	"github.com/oklog/run"
+	"github.com/owncloud/ocis/extensions/web/pkg/config"
+	"github.com/owncloud/ocis/extensions/web/pkg/config/parser"
+	"github.com/owncloud/ocis/extensions/web/pkg/logging"
+	"github.com/owncloud/ocis/extensions/web/pkg/metrics"
+	"github.com/owncloud/ocis/extensions/web/pkg/server/debug"
+	"github.com/owncloud/ocis/extensions/web/pkg/server/http"
+	"github.com/owncloud/ocis/extensions/web/pkg/tracing"
+	"github.com/urfave/cli/v2"
+)
+
+// Server is the entrypoint 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
+			}
+
+			// actually read the contents of the config file and override defaults
+			if cfg.File != "" {
+				contents, err := ioutil.ReadFile(cfg.File)
+				if err != nil {
+					logger.Err(err).Msg("error opening config file")
+					return err
+				}
+				if err = json.Unmarshal(contents, &cfg.Web.Config); err != nil {
+					logger.Fatal().Err(err).Msg("error unmarshalling config file")
+					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()
+
+			{
+				server, err := http.Server(
+					http.Logger(logger),
+					http.Context(ctx),
+					http.Namespace(cfg.HTTP.Namespace),
+					http.Config(cfg),
+					http.Metrics(metrics),
+				)
+
+				if err != nil {
+					logger.Info().
+						Err(err).
+						Str("transport", "http").
+						Msg("Failed to initialize server")
+
+					return err
+				}
+
+				gr.Add(func() error {
+					err := server.Run()
+					if err != nil {
+						logger.Error().
+							Err(err).
+							Str("transport", "http").
+							Msg("Failed to start server")
+					}
+					return err
+				}, func(_ error) {
+					logger.Info().
+						Str("transport", "http").
+						Msg("Shutting down server")
+
+					cancel()
+				})
+			}
+
+			{
+				server, err := debug.Server(
+					debug.Logger(logger),
+					debug.Context(ctx),
+					debug.Config(cfg),
+				)
+
+				if err != nil {
+					logger.Info().Err(err).Str("transport", "debug").Msg("Failed to initialize server")
+					return err
+				}
+
+				gr.Add(server.ListenAndServe, func(_ error) {
+					_ = server.Shutdown(ctx)
+					cancel()
+				})
+			}
+
+			return gr.Run()
+		},
+	}
+}