Factor out how monolith routes get added (#1107)

Previously we had 3 monoliths:
 - dendrite-monolith-server
 - dendrite-demo-libp2p
 - dendritejs

which all had their own of setting up public routes. Factor this
out into a new `setup.Monolith` struct which gets all dependencies
set as fields. This is different to `basecomponent.Base` which
doesn't provide any way to set configured deps (e.g public rooms db)

Part of a larger process to clean up how we initialise Dendrite.

internal/setup/monolith.go

@@ -0,0 +1,78 @@
+package setup
+
+import (
+	"github.com/Shopify/sarama"
+	"github.com/gorilla/mux"
+	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
+	"github.com/matrix-org/dendrite/clientapi"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/accounts"
+	"github.com/matrix-org/dendrite/clientapi/auth/storage/devices"
+	"github.com/matrix-org/dendrite/clientapi/producers"
+	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
+	"github.com/matrix-org/dendrite/federationapi"
+	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/matrix-org/dendrite/internal/transactions"
+	"github.com/matrix-org/dendrite/keyserver"
+	"github.com/matrix-org/dendrite/mediaapi"
+	"github.com/matrix-org/dendrite/publicroomsapi"
+	"github.com/matrix-org/dendrite/publicroomsapi/storage"
+	"github.com/matrix-org/dendrite/publicroomsapi/types"
+	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
+	serverKeyAPI "github.com/matrix-org/dendrite/serverkeyapi/api"
+	"github.com/matrix-org/dendrite/syncapi"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+// Monolith represents an instantiation of all dependencies required to build
+// all components of Dendrite, for use in monolith mode.
+type Monolith struct {
+	Config        *config.Dendrite
+	DeviceDB      devices.Database
+	AccountDB     accounts.Database
+	KeyRing       *gomatrixserverlib.KeyRing
+	FedClient     *gomatrixserverlib.FederationClient
+	KafkaConsumer sarama.Consumer
+	KafkaProducer sarama.SyncProducer
+
+	AppserviceAPI       appserviceAPI.AppServiceQueryAPI
+	EDUInternalAPI      eduServerAPI.EDUServerInputAPI
+	FederationSenderAPI federationSenderAPI.FederationSenderInternalAPI
+	RoomserverAPI       roomserverAPI.RoomserverInternalAPI
+	ServerKeyAPI        serverKeyAPI.ServerKeyInternalAPI
+
+	// TODO: remove, this isn't even a producer
+	EDUProducer *producers.EDUServerProducer
+	// TODO: can we remove this? It's weird that we are required the database
+	// yet every other component can do that on its own. libp2p-demo uses a custom
+	// database though annoyingly.
+	PublicRoomsDB storage.Database
+
+	// Optional
+	ExtPublicRoomsProvider types.ExternalPublicRoomsProvider
+}
+
+// AddAllPublicRoutes attaches all public paths to the given router
+func (m *Monolith) AddAllPublicRoutes(publicMux *mux.Router) {
+	clientapi.AddPublicRoutes(
+		publicMux, m.Config, m.KafkaConsumer, m.KafkaProducer, m.DeviceDB, m.AccountDB,
+		m.FedClient, m.KeyRing, m.RoomserverAPI,
+		m.EDUInternalAPI, m.AppserviceAPI, transactions.New(),
+		m.FederationSenderAPI,
+	)
+
+	keyserver.AddPublicRoutes(publicMux, m.Config, m.DeviceDB, m.AccountDB)
+	federationapi.AddPublicRoutes(
+		publicMux, m.Config, m.AccountDB, m.DeviceDB, m.FedClient,
+		m.KeyRing, m.RoomserverAPI, m.AppserviceAPI, m.FederationSenderAPI,
+		m.EDUProducer,
+	)
+	mediaapi.AddPublicRoutes(publicMux, m.Config, m.DeviceDB)
+	publicroomsapi.AddPublicRoutes(
+		publicMux, m.Config, m.KafkaConsumer, m.DeviceDB, m.PublicRoomsDB, m.RoomserverAPI, m.FedClient,
+		m.ExtPublicRoomsProvider,
+	)
+	syncapi.AddPublicRoutes(
+		publicMux, m.KafkaConsumer, m.DeviceDB, m.AccountDB, m.RoomserverAPI, m.FedClient, m.Config,
+	)
+}