Factor out component setup from commands (#384)

* Add base component

* Convert clientapi to using base component

* Convert federationapi to using base component

* Convert federationsender to using base component

* Convert mediaapi to using base component

* Convert publicroomsapi to using base component

* Convert roomserver to using base component

* Convert syncapi to using base component

* Convert monolith to using base component

* Split out config parsing and roomserver API creation

src/github.com/matrix-org/dendrite/federationsender/federationsender.go

@@ -0,0 +1,48 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package federationsender
+
+import (
+	"github.com/matrix-org/dendrite/common/basecomponent"
+	"github.com/matrix-org/dendrite/federationsender/consumers"
+	"github.com/matrix-org/dendrite/federationsender/queue"
+	"github.com/matrix-org/dendrite/federationsender/storage"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/sirupsen/logrus"
+)
+
+// SetupFederationSenderComponent sets up and registers HTTP handlers for the
+// FederationSender component.
+func SetupFederationSenderComponent(
+	base *basecomponent.BaseDendrite,
+	federation *gomatrixserverlib.FederationClient,
+	queryAPI api.RoomserverQueryAPI,
+) {
+	federationSenderDB, err := storage.NewDatabase(string(base.Cfg.Database.FederationSender))
+	if err != nil {
+		logrus.WithError(err).Panic("failed to connect to federation sender db")
+	}
+
+	queues := queue.NewOutgoingQueues(base.Cfg.Matrix.ServerName, federation)
+
+	consumer := consumers.NewOutputRoomEventConsumer(
+		base.Cfg, base.KafkaConsumer, queues,
+		federationSenderDB, queryAPI,
+	)
+	if err = consumer.Start(); err != nil {
+		logrus.WithError(err).Panic("failed to start room server consumer")
+	}
+}