Merge branch 'master' into neilalexander/persistentqueues

2025-12-20 21:33:19 -06:00 · 2020-06-30 14:05:09 +01:00 · 2020-06-30 14:05:09 +01:00 · 693928396d
parent 56e3d51fa4 6f49758b90
commit 693928396d
38 changed files with 1477 additions and 697 deletions
--- a/are-we-synapse-yet.list
+++ b/are-we-synapse-yet.list
@ -91,6 +91,7 @@ snd PUT /rooms/:room_id/send/:event_type/:txn_id deduplicates the same txn id
 get GET /rooms/:room_id/messages returns a message
 get GET /rooms/:room_id/messages lazy loads members correctly 
 typ PUT /rooms/:room_id/typing/:user_id sets typing notification 
+typ Typing notifications don't leak (3 subtests)
 rst GET /rooms/:room_id/state/m.room.power_levels can fetch levels
 rst PUT /rooms/:room_id/state/m.room.power_levels can set levels
 rst PUT power_levels should not explode if the old power levels were empty
--- a/clientapi/clientapi.go
+++ b/clientapi/clientapi.go
@ -18,9 +18,9 @@ import (
 	"github.com/Shopify/sarama"
 	"github.com/gorilla/mux"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
-	"github.com/matrix-org/dendrite/clientapi/consumers"
 	"github.com/matrix-org/dendrite/clientapi/producers"
 	"github.com/matrix-org/dendrite/clientapi/routing"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
 	"github.com/matrix-org/dendrite/internal/config"
@ -30,14 +30,12 @@ import (
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
 	"github.com/matrix-org/dendrite/userapi/storage/devices"
 	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/sirupsen/logrus"
 )

 // AddPublicRoutes sets up and registers HTTP handlers for the ClientAPI component.
 func AddPublicRoutes(
 	router *mux.Router,
 	cfg *config.Dendrite,
-	consumer sarama.Consumer,
 	producer sarama.SyncProducer,
 	deviceDB devices.Database,
 	accountsDB accounts.Database,
@ -45,6 +43,7 @@ func AddPublicRoutes(
 	rsAPI roomserverAPI.RoomserverInternalAPI,
 	eduInputAPI eduServerAPI.EDUServerInputAPI,
 	asAPI appserviceAPI.AppServiceQueryAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 	transactionsCache *transactions.Cache,
 	fsAPI federationSenderAPI.FederationSenderInternalAPI,
 	userAPI userapi.UserInternalAPI,
@ -54,16 +53,9 @@ func AddPublicRoutes(
 		Topic:    string(cfg.Kafka.Topics.OutputClientData),
 	}

-	roomEventConsumer := consumers.NewOutputRoomEventConsumer(
-		cfg, consumer, accountsDB, rsAPI,
-	)
-	if err := roomEventConsumer.Start(); err != nil {
-		logrus.WithError(err).Panicf("failed to start room server consumer")
-	}
-
 	routing.Setup(
 		router, cfg, eduInputAPI, rsAPI, asAPI,
 		accountsDB, deviceDB, userAPI, federation,
-		syncProducer, transactionsCache, fsAPI,
+		syncProducer, transactionsCache, fsAPI, stateAPI,
 	)
 }
--- a/clientapi/consumers/roomserver.go
+++ b/clientapi/consumers/roomserver.go
@ -1,92 +0,0 @@
-// 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 consumers
-
-import (
-	"context"
-	"encoding/json"
-
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/config"
-	"github.com/matrix-org/dendrite/roomserver/api"
-	"github.com/matrix-org/dendrite/userapi/storage/accounts"
-	"github.com/matrix-org/gomatrixserverlib"
-
-	"github.com/Shopify/sarama"
-	log "github.com/sirupsen/logrus"
-)
-
-// OutputRoomEventConsumer consumes events that originated in the room server.
-type OutputRoomEventConsumer struct {
-	rsAPI      api.RoomserverInternalAPI
-	rsConsumer *internal.ContinualConsumer
-	db         accounts.Database
-	serverName string
-}
-
-// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call Start() to begin consuming from room servers.
-func NewOutputRoomEventConsumer(
-	cfg *config.Dendrite,
-	kafkaConsumer sarama.Consumer,
-	store accounts.Database,
-	rsAPI api.RoomserverInternalAPI,
-) *OutputRoomEventConsumer {
-
-	consumer := internal.ContinualConsumer{
-		Topic:          string(cfg.Kafka.Topics.OutputRoomEvent),
-		Consumer:       kafkaConsumer,
-		PartitionStore: store,
-	}
-	s := &OutputRoomEventConsumer{
-		rsConsumer: &consumer,
-		db:         store,
-		rsAPI:      rsAPI,
-		serverName: string(cfg.Matrix.ServerName),
-	}
-	consumer.ProcessMessage = s.onMessage
-
-	return s
-}
-
-// Start consuming from room servers
-func (s *OutputRoomEventConsumer) Start() error {
-	return s.rsConsumer.Start()
-}
-
-// onMessage is called when the sync server receives a new event from the room server output log.
-// It is not safe for this function to be called from multiple goroutines, or else the
-// sync stream position may race and be incorrectly calculated.
-func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
-	// Parse out the event JSON
-	var output api.OutputEvent
-	if err := json.Unmarshal(msg.Value, &output); err != nil {
-		// If the message was invalid, log it and move on to the next message in the stream
-		log.WithError(err).Errorf("roomserver output log: message parse failure")
-		return nil
-	}
-
-	if output.Type != api.OutputTypeNewRoomEvent {
-		log.WithField("type", output.Type).Debug(
-			"roomserver output log: ignoring unknown output type",
-		)
-		return nil
-	}
-
-	return s.db.UpdateMemberships(
-		context.TODO(),
-		gomatrixserverlib.UnwrapEventHeaders(output.NewRoomEvent.AddsState()),
-		output.NewRoomEvent.RemovesStateEventIDs,
-	)
-}
--- a/clientapi/routing/memberships.go
+++ b/clientapi/routing/memberships.go
@ -18,9 +18,8 @@ import (
 	"encoding/json"
 	"net/http"

-	"github.com/matrix-org/dendrite/userapi/storage/accounts"
-
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/config"
 	"github.com/matrix-org/dendrite/roomserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
@ -95,20 +94,19 @@ func GetMemberships(
 func GetJoinedRooms(
 	req *http.Request,
 	device *userapi.Device,
-	accountsDB accounts.Database,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) util.JSONResponse {
-	localpart, _, err := gomatrixserverlib.SplitID('@', device.UserID)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err := stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("gomatrixserverlib.SplitID failed")
-		return jsonerror.InternalServerError()
-	}
-	joinedRooms, err := accountsDB.GetRoomIDsByLocalPart(req.Context(), localpart)
-	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountsDB.GetRoomIDsByLocalPart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}
 	return util.JSONResponse{
 		Code: http.StatusOK,
-		JSON: getJoinedRoomsResponse{joinedRooms},
+		JSON: getJoinedRoomsResponse{res.RoomIDs},
 	}
 }
--- a/clientapi/routing/profile.go
+++ b/clientapi/routing/profile.go
@ -23,6 +23,7 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/config"
 	"github.com/matrix-org/dendrite/internal/eventutil"
 	"github.com/matrix-org/dendrite/roomserver/api"
@ -93,8 +94,8 @@ func GetAvatarURL(
 // SetAvatarURL implements PUT /profile/{userID}/avatar_url
 // nolint:gocyclo
 func SetAvatarURL(
-	req *http.Request, accountDB accounts.Database, device *userapi.Device,
-	userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
+	req *http.Request, accountDB accounts.Database, stateAPI currentstateAPI.CurrentStateInternalAPI,
+	device *userapi.Device, userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
@ -139,9 +140,13 @@ func SetAvatarURL(
 		return jsonerror.InternalServerError()
 	}

-	memberships, err := accountDB.GetMembershipsByLocalpart(req.Context(), localpart)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err = stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipsByLocalpart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}

@ -152,7 +157,7 @@ func SetAvatarURL(
 	}

 	events, err := buildMembershipEvents(
-		req.Context(), memberships, newProfile, userID, cfg, evTime, rsAPI,
+		req.Context(), res.RoomIDs, newProfile, userID, cfg, evTime, rsAPI,
 	)
 	switch e := err.(type) {
 	case nil:
@ -207,8 +212,8 @@ func GetDisplayName(
 // SetDisplayName implements PUT /profile/{userID}/displayname
 // nolint:gocyclo
 func SetDisplayName(
-	req *http.Request, accountDB accounts.Database, device *userapi.Device,
-	userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
+	req *http.Request, accountDB accounts.Database, stateAPI currentstateAPI.CurrentStateInternalAPI,
+	device *userapi.Device, userID string, cfg *config.Dendrite, rsAPI api.RoomserverInternalAPI,
 ) util.JSONResponse {
 	if userID != device.UserID {
 		return util.JSONResponse{
@ -253,9 +258,13 @@ func SetDisplayName(
 		return jsonerror.InternalServerError()
 	}

-	memberships, err := accountDB.GetMembershipsByLocalpart(req.Context(), localpart)
+	var res currentstateAPI.QueryRoomsForUserResponse
+	err = stateAPI.QueryRoomsForUser(req.Context(), &currentstateAPI.QueryRoomsForUserRequest{
+		UserID:         device.UserID,
+		WantMembership: "join",
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipsByLocalpart failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryRoomsForUser failed")
 		return jsonerror.InternalServerError()
 	}

@ -266,7 +275,7 @@ func SetDisplayName(
 	}

 	events, err := buildMembershipEvents(
-		req.Context(), memberships, newProfile, userID, cfg, evTime, rsAPI,
+		req.Context(), res.RoomIDs, newProfile, userID, cfg, evTime, rsAPI,
 	)
 	switch e := err.(type) {
 	case nil:
@ -335,14 +344,14 @@ func getProfile(

 func buildMembershipEvents(
 	ctx context.Context,
-	memberships []authtypes.Membership,
+	roomIDs []string,
 	newProfile authtypes.Profile, userID string, cfg *config.Dendrite,
 	evTime time.Time, rsAPI api.RoomserverInternalAPI,
 ) ([]gomatrixserverlib.HeaderedEvent, error) {
 	evs := []gomatrixserverlib.HeaderedEvent{}

-	for _, membership := range memberships {
-		verReq := api.QueryRoomVersionForRoomRequest{RoomID: membership.RoomID}
+	for _, roomID := range roomIDs {
+		verReq := api.QueryRoomVersionForRoomRequest{RoomID: roomID}
 		verRes := api.QueryRoomVersionForRoomResponse{}
 		if err := rsAPI.QueryRoomVersionForRoom(ctx, &verReq, &verRes); err != nil {
 			return []gomatrixserverlib.HeaderedEvent{}, err
@ -350,7 +359,7 @@ func buildMembershipEvents(

 		builder := gomatrixserverlib.EventBuilder{
 			Sender:   userID,
-			RoomID:   membership.RoomID,
+			RoomID:   roomID,
 			Type:     "m.room.member",
 			StateKey: &userID,
 		}
--- a/clientapi/routing/routing.go
+++ b/clientapi/routing/routing.go
@ -23,6 +23,7 @@ import (
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
 	"github.com/matrix-org/dendrite/clientapi/producers"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
 	"github.com/matrix-org/dendrite/internal/config"
@ -58,6 +59,7 @@ func Setup(
 	syncProducer *producers.SyncAPIProducer,
 	transactionsCache *transactions.Cache,
 	federationSender federationSenderAPI.FederationSenderInternalAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) {

 	publicAPIMux.Handle("/client/versions",
@ -98,7 +100,7 @@ func Setup(
 	).Methods(http.MethodPost, http.MethodOptions)
 	r0mux.Handle("/joined_rooms",
 		httputil.MakeAuthAPI("joined_rooms", userAPI, func(req *http.Request, device *api.Device) util.JSONResponse {
-			return GetJoinedRooms(req, device, accountDB)
+			return GetJoinedRooms(req, device, stateAPI)
 		}),
 	).Methods(http.MethodGet, http.MethodOptions)
 	r0mux.Handle("/rooms/{roomID}/join",
@ -307,7 +309,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SendTyping(req, device, vars["roomID"], vars["userID"], accountDB, eduAPI)
+			return SendTyping(req, device, vars["roomID"], vars["userID"], accountDB, eduAPI, stateAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)

@ -404,7 +406,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SetAvatarURL(req, accountDB, device, vars["userID"], cfg, rsAPI)
+			return SetAvatarURL(req, accountDB, stateAPI, device, vars["userID"], cfg, rsAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 	// Browsers use the OPTIONS HTTP method to check if the CORS policy allows
@ -426,7 +428,7 @@ func Setup(
 			if err != nil {
 				return util.ErrorResponse(err)
 			}
-			return SetDisplayName(req, accountDB, device, vars["userID"], cfg, rsAPI)
+			return SetDisplayName(req, accountDB, stateAPI, device, vars["userID"], cfg, rsAPI)
 		}),
 	).Methods(http.MethodPut, http.MethodOptions)
 	// Browsers use the OPTIONS HTTP method to check if the CORS policy allows
--- a/clientapi/routing/sendtyping.go
+++ b/clientapi/routing/sendtyping.go
@ -13,15 +13,15 @@
 package routing

 import (
-	"database/sql"
 	"net/http"

 	"github.com/matrix-org/dendrite/clientapi/httputil"
 	"github.com/matrix-org/dendrite/clientapi/jsonerror"
-	"github.com/matrix-org/dendrite/clientapi/userutil"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/eduserver/api"
 	userapi "github.com/matrix-org/dendrite/userapi/api"
 	"github.com/matrix-org/dendrite/userapi/storage/accounts"
+	"github.com/matrix-org/gomatrixserverlib"
 	"github.com/matrix-org/util"
 )

@ -36,6 +36,7 @@ func SendTyping(
 	req *http.Request, device *userapi.Device, roomID string,
 	userID string, accountDB accounts.Database,
 	eduAPI api.EDUServerInputAPI,
+	stateAPI currentstateAPI.CurrentStateInternalAPI,
 ) util.JSONResponse {
 	if device.UserID != userID {
 		return util.JSONResponse{
@ -44,23 +45,38 @@ func SendTyping(
 		}
 	}

-	localpart, err := userutil.ParseUsernameParam(userID, nil)
+	// Verify that the user is a member of this room
+	tuple := gomatrixserverlib.StateKeyTuple{
+		EventType: gomatrixserverlib.MRoomMember,
+		StateKey:  userID,
+	}
+	var res currentstateAPI.QueryCurrentStateResponse
+	err := stateAPI.QueryCurrentState(req.Context(), &currentstateAPI.QueryCurrentStateRequest{
+		RoomID:      roomID,
+		StateTuples: []gomatrixserverlib.StateKeyTuple{tuple},
+	}, &res)
 	if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("userutil.ParseUsernameParam failed")
+		util.GetLogger(req.Context()).WithError(err).Error("QueryCurrentState failed")
 		return jsonerror.InternalServerError()
 	}
-
-	// Verify that the user is a member of this room
-	_, err = accountDB.GetMembershipInRoomByLocalpart(req.Context(), localpart, roomID)
-	if err == sql.ErrNoRows {
+	ev := res.StateEvents[tuple]
+	if ev == nil {
 		return util.JSONResponse{
 			Code: http.StatusForbidden,
 			JSON: jsonerror.Forbidden("User not in this room"),
 		}
-	} else if err != nil {
-		util.GetLogger(req.Context()).WithError(err).Error("accountDB.GetMembershipInRoomByLocalPart failed")
+	}
+	membership, err := ev.Membership()
+	if err != nil {
+		util.GetLogger(req.Context()).WithError(err).Error("Member event isn't valid")
 		return jsonerror.InternalServerError()
 	}
+	if membership != gomatrixserverlib.Join {
+		return util.JSONResponse{
+			Code: http.StatusForbidden,
+			JSON: jsonerror.Forbidden("User not in this room"),
+		}
+	}

 	// parse the incoming http request
 	var r typingContentJSON
--- a/cmd/dendrite-client-api-server/main.go
+++ b/cmd/dendrite-client-api-server/main.go
@ -35,10 +35,11 @@ func main() {
 	fsAPI := base.FederationSenderHTTPClient()
 	eduInputAPI := base.EDUServerClient()
 	userAPI := base.UserAPIClient()
+	stateAPI := base.CurrentStateAPIClient()

 	clientapi.AddPublicRoutes(
-		base.PublicAPIMux, base.Cfg, base.KafkaConsumer, base.KafkaProducer, deviceDB, accountDB, federation,
-		rsAPI, eduInputAPI, asQuery, transactions.New(), fsAPI, userAPI,
+		base.PublicAPIMux, base.Cfg, base.KafkaProducer, deviceDB, accountDB, federation,
+		rsAPI, eduInputAPI, asQuery, stateAPI, transactions.New(), fsAPI, userAPI,
 	)

 	base.SetupAndServeHTTP(string(base.Cfg.Bind.ClientAPI), string(base.Cfg.Listen.ClientAPI))
--- a/cmd/dendrite-demo-libp2p/main.go
+++ b/cmd/dendrite-demo-libp2p/main.go
@ -30,6 +30,7 @@ import (
 	p2pdisc "github.com/libp2p/go-libp2p/p2p/discovery"
 	"github.com/matrix-org/dendrite/appservice"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-libp2p/storage"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/federationsender"
 	"github.com/matrix-org/dendrite/internal/config"
@ -166,6 +167,7 @@ func main() {
 	if err != nil {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}
+	stateAPI := currentstateserver.NewInternalAPI(base.Base.Cfg, base.Base.KafkaConsumer)

 	monolith := setup.Monolith{
 		Config:        base.Base.Cfg,
@ -182,6 +184,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		ServerKeyAPI:        serverKeyAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,

 		PublicRoomsDB: publicRoomsDB,
--- a/cmd/dendrite-demo-yggdrasil/main.go
+++ b/cmd/dendrite-demo-yggdrasil/main.go
@ -27,6 +27,7 @@ import (
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/embed"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/signing"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/yggconn"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@ -115,6 +116,8 @@ func main() {

 	embed.Embed(base.BaseMux, *instancePort, "Yggdrasil Demo")

+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@ -130,6 +133,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		UserAPI:             userAPI,
+		StateAPI:            stateAPI,
 		//ServerKeyAPI:        serverKeyAPI,

 		PublicRoomsDB: publicRoomsDB,
--- a/cmd/dendrite-monolith-server/main.go
+++ b/cmd/dendrite-monolith-server/main.go
@ -20,6 +20,7 @@ import (
 	"os"

 	"github.com/matrix-org/dendrite/appservice"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@ -122,6 +123,8 @@ func main() {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}

+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@ -137,6 +140,7 @@ func main() {
 		FederationSenderAPI: fsAPI,
 		RoomserverAPI:       rsAPI,
 		ServerKeyAPI:        serverKeyAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,

 		PublicRoomsDB: publicRoomsDB,
--- a/cmd/dendritejs/main.go
+++ b/cmd/dendritejs/main.go
@ -22,6 +22,7 @@ import (
 	"syscall/js"

 	"github.com/matrix-org/dendrite/appservice"
+	"github.com/matrix-org/dendrite/currentstateserver"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
 	"github.com/matrix-org/dendrite/federationsender"
@ -218,6 +219,8 @@ func main() {
 		logrus.WithError(err).Panicf("failed to connect to public rooms db")
 	}

+	stateAPI := currentstateserver.NewInternalAPI(base.Cfg, base.KafkaConsumer)
+
 	monolith := setup.Monolith{
 		Config:        base.Cfg,
 		AccountDB:     accountDB,
@ -232,6 +235,7 @@ func main() {
 		EDUInternalAPI:      eduInputAPI,
 		FederationSenderAPI: fedSenderAPI,
 		RoomserverAPI:       rsAPI,
+		StateAPI:            stateAPI,
 		UserAPI:             userAPI,
 		//ServerKeyAPI:        serverKeyAPI,

--- a/currentstateserver/api/api.go
+++ b/currentstateserver/api/api.go
@ -0,0 +1,78 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 api
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type CurrentStateInternalAPI interface {
+	// QueryCurrentState retrieves the requested state events. If state events are not found, they will be missing from
+	// the response.
+	QueryCurrentState(ctx context.Context, req *QueryCurrentStateRequest, res *QueryCurrentStateResponse) error
+	// QueryRoomsForUser retrieves a list of room IDs matching the given query.
+	QueryRoomsForUser(ctx context.Context, req *QueryRoomsForUserRequest, res *QueryRoomsForUserResponse) error
+}
+
+type QueryRoomsForUserRequest struct {
+	UserID string
+	// The desired membership of the user. If this is the empty string then no rooms are returned.
+	WantMembership string
+}
+
+type QueryRoomsForUserResponse struct {
+	RoomIDs []string
+}
+
+type QueryCurrentStateRequest struct {
+	RoomID      string
+	StateTuples []gomatrixserverlib.StateKeyTuple
+}
+
+type QueryCurrentStateResponse struct {
+	StateEvents map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent
+}
+
+// MarshalJSON stringifies the StateKeyTuple keys so they can be sent over the wire in HTTP API mode.
+func (r *QueryCurrentStateResponse) MarshalJSON() ([]byte, error) {
+	se := make(map[string]*gomatrixserverlib.HeaderedEvent, len(r.StateEvents))
+	for k, v := range r.StateEvents {
+		// use 0x1F (unit separator) as the delimiter between type/state key,
+		se[fmt.Sprintf("%s\x1F%s", k.EventType, k.StateKey)] = v
+	}
+	return json.Marshal(se)
+}
+
+func (r *QueryCurrentStateResponse) UnmarshalJSON(data []byte) error {
+	res := make(map[string]*gomatrixserverlib.HeaderedEvent)
+	err := json.Unmarshal(data, &res)
+	if err != nil {
+		return err
+	}
+	r.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent, len(res))
+	for k, v := range res {
+		fields := strings.Split(k, "\x1F")
+		r.StateEvents[gomatrixserverlib.StateKeyTuple{
+			EventType: fields[0],
+			StateKey:  fields[1],
+		}] = v
+	}
+	return nil
+}
--- a/currentstateserver/consumers/roomserver.go
+++ b/currentstateserver/consumers/roomserver.go
@ -0,0 +1,140 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 consumers
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/Shopify/sarama"
+	"github.com/matrix-org/dendrite/currentstateserver/storage"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/dendrite/syncapi/types"
+	"github.com/matrix-org/gomatrixserverlib"
+	log "github.com/sirupsen/logrus"
+)
+
+type OutputRoomEventConsumer struct {
+	rsConsumer *internal.ContinualConsumer
+	db         storage.Database
+}
+
+func NewOutputRoomEventConsumer(topicName string, kafkaConsumer sarama.Consumer, store storage.Database) *OutputRoomEventConsumer {
+	consumer := &internal.ContinualConsumer{
+		Topic:          topicName,
+		Consumer:       kafkaConsumer,
+		PartitionStore: store,
+	}
+	s := &OutputRoomEventConsumer{
+		rsConsumer: consumer,
+		db:         store,
+	}
+	consumer.ProcessMessage = s.onMessage
+
+	return s
+}
+
+func (c *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
+	// Parse out the event JSON
+	var output api.OutputEvent
+	if err := json.Unmarshal(msg.Value, &output); err != nil {
+		// If the message was invalid, log it and move on to the next message in the stream
+		log.WithError(err).Errorf("roomserver output log: message parse failure")
+		return nil
+	}
+
+	switch output.Type {
+	case api.OutputTypeNewRoomEvent:
+		return c.onNewRoomEvent(context.TODO(), *output.NewRoomEvent)
+	case api.OutputTypeNewInviteEvent:
+	case api.OutputTypeRetireInviteEvent:
+	default:
+		log.WithField("type", output.Type).Debug(
+			"roomserver output log: ignoring unknown output type",
+		)
+	}
+	return nil
+}
+
+func (c *OutputRoomEventConsumer) onNewRoomEvent(
+	ctx context.Context, msg api.OutputNewRoomEvent,
+) error {
+	ev := msg.Event
+
+	addsStateEvents := msg.AddsState()
+
+	ev, err := c.updateStateEvent(ev)
+	if err != nil {
+		return err
+	}
+
+	for i := range addsStateEvents {
+		addsStateEvents[i], err = c.updateStateEvent(addsStateEvents[i])
+		if err != nil {
+			return err
+		}
+	}
+
+	err = c.db.StoreStateEvents(
+		ctx,
+		addsStateEvents,
+		msg.RemovesStateEventIDs,
+	)
+	if err != nil {
+		// panic rather than continue with an inconsistent database
+		log.WithFields(log.Fields{
+			"event":      string(ev.JSON()),
+			log.ErrorKey: err,
+			"add":        msg.AddsStateEventIDs,
+			"del":        msg.RemovesStateEventIDs,
+		}).Panicf("roomserver output log: write event failure")
+	}
+	return nil
+}
+
+// Start consuming from room servers
+func (c *OutputRoomEventConsumer) Start() error {
+	return c.rsConsumer.Start()
+}
+
+func (c *OutputRoomEventConsumer) updateStateEvent(event gomatrixserverlib.HeaderedEvent) (gomatrixserverlib.HeaderedEvent, error) {
+	var stateKey string
+	if event.StateKey() == nil {
+		stateKey = ""
+	} else {
+		stateKey = *event.StateKey()
+	}
+
+	prevEvent, err := c.db.GetStateEvent(
+		context.TODO(), event.RoomID(), event.Type(), stateKey,
+	)
+	if err != nil {
+		return event, err
+	}
+
+	if prevEvent == nil {
+		return event, nil
+	}
+
+	prev := types.PrevEventRef{
+		PrevContent:   prevEvent.Content(),
+		ReplacesState: prevEvent.EventID(),
+		PrevSender:    prevEvent.Sender(),
+	}
+
+	event.Event, err = event.SetUnsigned(prev)
+	return event, err
+}
--- a/currentstateserver/currentstateserver.go
+++ b/currentstateserver/currentstateserver.go
@ -0,0 +1,51 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 currentstateserver
+
+import (
+	"github.com/Shopify/sarama"
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/currentstateserver/api"
+	"github.com/matrix-org/dendrite/currentstateserver/consumers"
+	"github.com/matrix-org/dendrite/currentstateserver/internal"
+	"github.com/matrix-org/dendrite/currentstateserver/inthttp"
+	"github.com/matrix-org/dendrite/currentstateserver/storage"
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/sirupsen/logrus"
+)
+
+// AddInternalRoutes registers HTTP handlers for the internal API. Invokes functions
+// on the given input API.
+func AddInternalRoutes(router *mux.Router, intAPI api.CurrentStateInternalAPI) {
+	inthttp.AddRoutes(router, intAPI)
+}
+
+// NewInternalAPI returns a concrete implementation of the internal API. Callers
+// can call functions directly on the returned API or via an HTTP interface using AddInternalRoutes.
+func NewInternalAPI(cfg *config.Dendrite, consumer sarama.Consumer) api.CurrentStateInternalAPI {
+	csDB, err := storage.NewDatabase(string(cfg.Database.CurrentState), cfg.DbProperties())
+	if err != nil {
+		logrus.WithError(err).Panicf("failed to open database")
+	}
+	roomConsumer := consumers.NewOutputRoomEventConsumer(
+		string(cfg.Kafka.Topics.OutputRoomEvent), consumer, csDB,
+	)
+	if err = roomConsumer.Start(); err != nil {
+		logrus.WithError(err).Panicf("failed to start room server consumer")
+	}
+	return &internal.CurrentStateInternalAPI{
+		DB: csDB,
+	}
+}
--- a/currentstateserver/currentstateserver_test.go
+++ b/currentstateserver/currentstateserver_test.go
@ -0,0 +1,180 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 currentstateserver
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/Shopify/sarama"
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/currentstateserver/api"
+	"github.com/matrix-org/dendrite/currentstateserver/inthttp"
+	"github.com/matrix-org/dendrite/internal/config"
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/internal/test"
+	roomserverAPI "github.com/matrix-org/dendrite/roomserver/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/naffka"
+)
+
+var (
+	testRoomVersion = gomatrixserverlib.RoomVersionV1
+	testData        = []json.RawMessage{
+		[]byte(`{"auth_events":[],"content":{"creator":"@userid:kaer.morhen"},"depth":0,"event_id":"$0ok8ynDp7kjc95e3:kaer.morhen","hashes":{"sha256":"17kPoH+h0Dk4Omn7Sus0qMb6+oGcf+CZFEgDhv7UKWs"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[],"prev_state":[],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"jP4a04f5/F10Pw95FPpdCyKAO44JOwUQ/MZOOeA/RTU1Dn+AHPMzGSaZnuGjRr/xQuADt+I3ctb5ZQfLKNzHDw"}},"state_key":"","type":"m.room.create"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}]],"content":{"membership":"join"},"depth":1,"event_id":"$LEwEu0kxrtu5fOiS:kaer.morhen","hashes":{"sha256":"B7M88PhXf3vd1LaFtjQutFu4x/w7fHD28XKZ4sAsJTo"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}]],"prev_state":[],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"p2vqmuJn7ZBRImctSaKbXCAxCcBlIjPH9JHte1ouIUGy84gpu4eLipOvSBCLL26hXfC0Zrm4WUto6Hr+ohdrCg"}},"state_key":"@userid:kaer.morhen","type":"m.room.member"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"join_rule":"public"},"depth":2,"event_id":"$SMHlqUrNhhBBRLeN:kaer.morhen","hashes":{"sha256":"vIuJQvmMjrGxshAkj1SXe0C4RqvMbv4ZADDw9pFCWqQ"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"prev_state":[],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"hBMsb3Qppo3RaqqAl4JyTgaiWEbW5hlckATky6PrHun+F3YM203TzG7w9clwuQU5F5pZoB1a6nw+to0hN90FAw"}},"state_key":"","type":"m.room.join_rules"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"history_visibility":"shared"},"depth":3,"event_id":"$6F1yGIbO0J7TM93h:kaer.morhen","hashes":{"sha256":"Mr23GKSlZW7UCCYLgOWawI2Sg6KIoMjUWO2TDenuOgw"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$SMHlqUrNhhBBRLeN:kaer.morhen",{"sha256":"SylzE8U02I+6eyEHgL+FlU0L5YdqrVp8OOlxKS9VQW0"}]],"prev_state":[],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"sHLKrFI3hKGrEJfpMVZSDS3LvLasQsy50CTsOwru9XTVxgRsPo6wozNtRVjxo1J3Rk18RC9JppovmQ5VR5EcDw"}},"state_key":"","type":"m.room.history_visibility"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"ban":50,"events":null,"events_default":0,"invite":0,"kick":50,"redact":50,"state_default":50,"users":null,"users_default":0},"depth":4,"event_id":"$UKNe10XzYzG0TeA9:kaer.morhen","hashes":{"sha256":"ngbP3yja9U5dlckKerUs/fSOhtKxZMCVvsfhPURSS28"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$6F1yGIbO0J7TM93h:kaer.morhen",{"sha256":"A4CucrKSoWX4IaJXhq02mBg1sxIyZEftbC+5p3fZAvk"}]],"prev_state":[],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"zOmwlP01QL3yFchzuR9WHvogOoBZA3oVtNIF3lM0ZfDnqlSYZB9sns27G/4HVq0k7alaK7ZE3oGoCrVnMkPNCw"}},"state_key":"","type":"m.room.power_levels"}`),
+		// messages
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"body":"Test Message"},"depth":5,"event_id":"$gl2T9l3qm0kUbiIJ:kaer.morhen","hashes":{"sha256":"Qx3nRMHLDPSL5hBAzuX84FiSSP0K0Kju2iFoBWH4Za8"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$UKNe10XzYzG0TeA9:kaer.morhen",{"sha256":"KtSRyMjt0ZSjsv2koixTRCxIRCGoOp6QrKscsW97XRo"}]],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"sqDgv3EG7ml5VREzmT9aZeBpS4gAPNIaIeJOwqjDhY0GPU/BcpX5wY4R7hYLrNe5cChgV+eFy/GWm1Zfg5FfDg"}},"type":"m.room.message"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"body":"Test Message"},"depth":6,"event_id":"$MYSbs8m4rEbsCWXD:kaer.morhen","hashes":{"sha256":"kgbYM7v4Ud2YaBsjBTolM4ySg6rHcJNYI6nWhMSdFUA"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$gl2T9l3qm0kUbiIJ:kaer.morhen",{"sha256":"C/rD04h9wGxRdN2G/IBfrgoE1UovzLZ+uskwaKZ37/Q"}]],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"x0UoKh968jj/F5l1/R7Ew0T6CTKuew3PLNHASNxqck/bkNe8yYQiDHXRr+kZxObeqPZZTpaF1+EI+bLU9W8GDQ"}},"type":"m.room.message"}`),
+		[]byte(`{"auth_events":[["$0ok8ynDp7kjc95e3:kaer.morhen",{"sha256":"sWCi6Ckp9rDimQON+MrUlNRkyfZ2tjbPbWfg2NMB18Q"}],["$LEwEu0kxrtu5fOiS:kaer.morhen",{"sha256":"1aKajq6DWHru1R1HJjvdWMEavkJJHGaTmPvfuERUXaA"}]],"content":{"body":"Test Message"},"depth":7,"event_id":"$N5x9WJkl9ClPrAEg:kaer.morhen","hashes":{"sha256":"FWM8oz4yquTunRZ67qlW2gzPDzdWfBP6RPHXhK1I/x8"},"origin":"kaer.morhen","origin_server_ts":0,"prev_events":[["$MYSbs8m4rEbsCWXD:kaer.morhen",{"sha256":"fatqgW+SE8mb2wFn3UN+drmluoD4UJ/EcSrL6Ur9q1M"}]],"room_id":"!roomid:kaer.morhen","sender":"@userid:kaer.morhen","signatures":{"kaer.morhen":{"ed25519:auto":"Y+LX/xcyufoXMOIoqQBNOzy6lZfUGB1ffgXIrSugk6obMiyAsiRejHQN/pciZXsHKxMJLYRFAz4zSJoS/LGPAA"}},"type":"m.room.message"}`),
+	}
+	testEvents      = []gomatrixserverlib.HeaderedEvent{}
+	testStateEvents = make(map[gomatrixserverlib.StateKeyTuple]gomatrixserverlib.HeaderedEvent)
+
+	kafkaTopic = "room_events"
+)
+
+func init() {
+	for _, j := range testData {
+		e, err := gomatrixserverlib.NewEventFromTrustedJSON(j, false, testRoomVersion)
+		if err != nil {
+			panic("cannot load test data: " + err.Error())
+		}
+		h := e.Headered(testRoomVersion)
+		testEvents = append(testEvents, h)
+		if e.StateKey() != nil {
+			testStateEvents[gomatrixserverlib.StateKeyTuple{
+				EventType: e.Type(),
+				StateKey:  *e.StateKey(),
+			}] = h
+		}
+	}
+}
+
+func MustWriteOutputEvent(t *testing.T, producer sarama.SyncProducer, out *roomserverAPI.OutputNewRoomEvent) error {
+	value, err := json.Marshal(roomserverAPI.OutputEvent{
+		Type:         roomserverAPI.OutputTypeNewRoomEvent,
+		NewRoomEvent: out,
+	})
+	if err != nil {
+		t.Fatalf("failed to marshal output event: %s", err)
+	}
+	_, _, err = producer.SendMessage(&sarama.ProducerMessage{
+		Topic: kafkaTopic,
+		Key:   sarama.StringEncoder(out.Event.RoomID()),
+		Value: sarama.ByteEncoder(value),
+	})
+	if err != nil {
+		t.Fatalf("failed to send message: %s", err)
+	}
+	return nil
+}
+
+func MustMakeInternalAPI(t *testing.T) (api.CurrentStateInternalAPI, sarama.SyncProducer) {
+	cfg := &config.Dendrite{}
+	cfg.Kafka.Topics.OutputRoomEvent = config.Topic(kafkaTopic)
+	cfg.Database.CurrentState = config.DataSource("file::memory:")
+	db, err := sqlutil.Open(sqlutil.SQLiteDriverName(), "file::memory:", nil)
+	if err != nil {
+		t.Fatalf("Failed to open naffka database: %s", err)
+	}
+	naffkaDB, err := naffka.NewSqliteDatabase(db)
+	if err != nil {
+		t.Fatalf("Failed to setup naffka database: %s", err)
+	}
+	naff, err := naffka.New(naffkaDB)
+	if err != nil {
+		t.Fatalf("Failed to create naffka consumer: %s", err)
+	}
+	return NewInternalAPI(cfg, naff), naff
+}
+
+func TestQueryCurrentState(t *testing.T) {
+	currStateAPI, producer := MustMakeInternalAPI(t)
+	plTuple := gomatrixserverlib.StateKeyTuple{
+		EventType: "m.room.power_levels",
+		StateKey:  "",
+	}
+	plEvent := testEvents[4]
+	MustWriteOutputEvent(t, producer, &roomserverAPI.OutputNewRoomEvent{
+		Event:             plEvent,
+		AddsStateEventIDs: []string{plEvent.EventID()},
+	})
+	// we have no good way to know /when/ the server has consumed the event
+	time.Sleep(100 * time.Millisecond)
+
+	testCases := []struct {
+		req     api.QueryCurrentStateRequest
+		wantRes api.QueryCurrentStateResponse
+		wantErr error
+	}{
+		{
+			req: api.QueryCurrentStateRequest{
+				RoomID: plEvent.RoomID(),
+				StateTuples: []gomatrixserverlib.StateKeyTuple{
+					plTuple,
+				},
+			},
+			wantRes: api.QueryCurrentStateResponse{
+				StateEvents: map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent{
+					plTuple: &plEvent,
+				},
+			},
+		},
+	}
+
+	runCases := func(testAPI api.CurrentStateInternalAPI) {
+		for _, tc := range testCases {
+			var gotRes api.QueryCurrentStateResponse
+			gotErr := testAPI.QueryCurrentState(context.TODO(), &tc.req, &gotRes)
+			if tc.wantErr == nil && gotErr != nil || tc.wantErr != nil && gotErr == nil {
+				t.Errorf("QueryCurrentState error, got %s want %s", gotErr, tc.wantErr)
+				continue
+			}
+			for tuple, wantEvent := range tc.wantRes.StateEvents {
+				gotEvent, ok := gotRes.StateEvents[tuple]
+				if !ok {
+					t.Errorf("QueryCurrentState want tuple %+v but it is missing from the response", tuple)
+					continue
+				}
+				if !reflect.DeepEqual(gotEvent.JSON(), wantEvent.JSON()) {
+					t.Errorf("QueryCurrentState tuple %+v got event JSON %s want %s", tuple, string(gotEvent.JSON()), string(wantEvent.JSON()))
+				}
+			}
+		}
+	}
+	t.Run("HTTP API", func(t *testing.T) {
+		router := mux.NewRouter().PathPrefix(httputil.InternalPathPrefix).Subrouter()
+		AddInternalRoutes(router, currStateAPI)
+		apiURL, cancel := test.ListenAndServe(t, router, false)
+		defer cancel()
+		httpAPI, err := inthttp.NewCurrentStateAPIClient(apiURL, &http.Client{})
+		if err != nil {
+			t.Fatalf("failed to create HTTP client")
+		}
+		runCases(httpAPI)
+	})
+	t.Run("Monolith", func(t *testing.T) {
+		runCases(currStateAPI)
+	})
+}
--- a/currentstateserver/internal/api.go
+++ b/currentstateserver/internal/api.go
@ -0,0 +1,50 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 internal
+
+import (
+	"context"
+
+	"github.com/matrix-org/dendrite/currentstateserver/api"
+	"github.com/matrix-org/dendrite/currentstateserver/storage"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type CurrentStateInternalAPI struct {
+	DB storage.Database
+}
+
+func (a *CurrentStateInternalAPI) QueryCurrentState(ctx context.Context, req *api.QueryCurrentStateRequest, res *api.QueryCurrentStateResponse) error {
+	res.StateEvents = make(map[gomatrixserverlib.StateKeyTuple]*gomatrixserverlib.HeaderedEvent)
+	for _, tuple := range req.StateTuples {
+		ev, err := a.DB.GetStateEvent(ctx, req.RoomID, tuple.EventType, tuple.StateKey)
+		if err != nil {
+			return err
+		}
+		if ev != nil {
+			res.StateEvents[tuple] = ev
+		}
+	}
+	return nil
+}
+
+func (a *CurrentStateInternalAPI) QueryRoomsForUser(ctx context.Context, req *api.QueryRoomsForUserRequest, res *api.QueryRoomsForUserResponse) error {
+	roomIDs, err := a.DB.GetRoomsByMembership(ctx, req.UserID, req.WantMembership)
+	if err != nil {
+		return err
+	}
+	res.RoomIDs = roomIDs
+	return nil
+}
--- a/currentstateserver/inthttp/client.go
+++ b/currentstateserver/inthttp/client.go
@ -0,0 +1,75 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 inthttp
+
+import (
+	"context"
+	"errors"
+	"net/http"
+
+	"github.com/matrix-org/dendrite/currentstateserver/api"
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/opentracing/opentracing-go"
+)
+
+// HTTP paths for the internal HTTP APIs
+const (
+	QueryCurrentStatePath = "/currentstateserver/queryCurrentState"
+	QueryRoomsForUserPath = "/currentstateserver/queryRoomsForUser"
+)
+
+// NewCurrentStateAPIClient creates a CurrentStateInternalAPI implemented by talking to a HTTP POST API.
+// If httpClient is nil an error is returned
+func NewCurrentStateAPIClient(
+	apiURL string,
+	httpClient *http.Client,
+) (api.CurrentStateInternalAPI, error) {
+	if httpClient == nil {
+		return nil, errors.New("NewCurrentStateAPIClient: httpClient is <nil>")
+	}
+	return &httpCurrentStateInternalAPI{
+		apiURL:     apiURL,
+		httpClient: httpClient,
+	}, nil
+}
+
+type httpCurrentStateInternalAPI struct {
+	apiURL     string
+	httpClient *http.Client
+}
+
+func (h *httpCurrentStateInternalAPI) QueryCurrentState(
+	ctx context.Context,
+	request *api.QueryCurrentStateRequest,
+	response *api.QueryCurrentStateResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "QueryCurrentState")
+	defer span.Finish()
+
+	apiURL := h.apiURL + QueryCurrentStatePath
+	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}
+
+func (h *httpCurrentStateInternalAPI) QueryRoomsForUser(
+	ctx context.Context,
+	request *api.QueryRoomsForUserRequest,
+	response *api.QueryRoomsForUserResponse,
+) error {
+	span, ctx := opentracing.StartSpanFromContext(ctx, "QueryRoomsForUser")
+	defer span.Finish()
+
+	apiURL := h.apiURL + QueryRoomsForUserPath
+	return httputil.PostJSON(ctx, span, h.httpClient, apiURL, request, response)
+}
--- a/currentstateserver/inthttp/server.go
+++ b/currentstateserver/inthttp/server.go
@ -0,0 +1,54 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 inthttp
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/matrix-org/dendrite/currentstateserver/api"
+	"github.com/matrix-org/dendrite/internal/httputil"
+	"github.com/matrix-org/util"
+)
+
+func AddRoutes(internalAPIMux *mux.Router, intAPI api.CurrentStateInternalAPI) {
+	internalAPIMux.Handle(QueryCurrentStatePath,
+		httputil.MakeInternalAPI("queryCurrentState", func(req *http.Request) util.JSONResponse {
+			request := api.QueryCurrentStateRequest{}
+			response := api.QueryCurrentStateResponse{}
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.MessageResponse(http.StatusBadRequest, err.Error())
+			}
+			if err := intAPI.QueryCurrentState(req.Context(), &request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
+		}),
+	)
+	internalAPIMux.Handle(QueryRoomsForUserPath,
+		httputil.MakeInternalAPI("queryRoomsForUser", func(req *http.Request) util.JSONResponse {
+			request := api.QueryRoomsForUserRequest{}
+			response := api.QueryRoomsForUserResponse{}
+			if err := json.NewDecoder(req.Body).Decode(&request); err != nil {
+				return util.MessageResponse(http.StatusBadRequest, err.Error())
+			}
+			if err := intAPI.QueryRoomsForUser(req.Context(), &request, &response); err != nil {
+				return util.ErrorResponse(err)
+			}
+			return util.JSONResponse{Code: http.StatusOK, JSON: &response}
+		}),
+	)
+}
--- a/currentstateserver/storage/interface.go
+++ b/currentstateserver/storage/interface.go
@ -0,0 +1,34 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 storage
+
+import (
+	"context"
+
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type Database interface {
+	internal.PartitionStorer
+	// StoreStateEvents updates the database with new events from the roomserver.
+	StoreStateEvents(ctx context.Context, addStateEvents []gomatrixserverlib.HeaderedEvent, removeStateEventIDs []string) error
+	// GetStateEvent returns the state event of a given type for a given room with a given state key
+	// If no event could be found, returns nil
+	// If there was an issue during the retrieval, returns an error
+	GetStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error)
+	// GetRoomsByMembership returns a list of room IDs matching the provided membership and user ID (as state_key).
+	GetRoomsByMembership(ctx context.Context, userID, membership string) ([]string, error)
+}
--- a/currentstateserver/storage/postgres/current_room_state_table.go
+++ b/currentstateserver/storage/postgres/current_room_state_table.go
@ -0,0 +1,208 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 postgres
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"strconv"
+
+	"github.com/lib/pq"
+	"github.com/matrix-org/dendrite/currentstateserver/storage/tables"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+var leaveEnum = strconv.Itoa(tables.MembershipToEnum["leave"])
+
+var currentRoomStateSchema = `
+-- Stores the current room state for every room.
+CREATE TABLE IF NOT EXISTS currentstate_current_room_state (
+    -- The 'room_id' key for the state event.
+    room_id TEXT NOT NULL,
+    -- The state event ID
+    event_id TEXT NOT NULL,
+    -- The state event type e.g 'm.room.member'
+    type TEXT NOT NULL,
+    -- The 'sender' property of the event.
+    sender TEXT NOT NULL,
+    -- The state_key value for this state event e.g ''
+    state_key TEXT NOT NULL,
+    -- The JSON for the event. Stored as TEXT because this should be valid UTF-8.
+    headered_event_json TEXT NOT NULL,
+    -- The 'content.membership' enum value if this event is an m.room.member event.
+    membership SMALLINT NOT NULL DEFAULT 0,
+    -- Clobber based on 3-uple of room_id, type and state_key
+    CONSTRAINT currentstate_current_room_state_unique UNIQUE (room_id, type, state_key)
+);
+-- for event deletion
+CREATE UNIQUE INDEX IF NOT EXISTS currentstate_event_id_idx ON currentstate_current_room_state(event_id, room_id, type, sender);
+-- for querying membership states of users
+CREATE INDEX IF NOT EXISTS currentstate_membership_idx ON currentstate_current_room_state(type, state_key, membership)
+WHERE membership IS NOT NULL AND membership != ` + leaveEnum + `;
+`
+
+const upsertRoomStateSQL = "" +
+	"INSERT INTO currentstate_current_room_state (room_id, event_id, type, sender, state_key, headered_event_json, membership)" +
+	" VALUES ($1, $2, $3, $4, $5, $6, $7)" +
+	" ON CONFLICT ON CONSTRAINT currentstate_current_room_state_unique" +
+	" DO UPDATE SET event_id = $2, sender=$4, headered_event_json = $6, membership = $7"
+
+const deleteRoomStateByEventIDSQL = "" +
+	"DELETE FROM currentstate_current_room_state WHERE event_id = $1"
+
+const selectRoomIDsWithMembershipSQL = "" +
+	"SELECT room_id FROM currentstate_current_room_state WHERE type = 'm.room.member' AND state_key = $1 AND membership = $2"
+
+const selectStateEventSQL = "" +
+	"SELECT headered_event_json FROM currentstate_current_room_state WHERE room_id = $1 AND type = $2 AND state_key = $3"
+
+const selectEventsWithEventIDsSQL = "" +
+	"SELECT headered_event_json FROM currentstate_current_room_state WHERE event_id = ANY($1)"
+
+type currentRoomStateStatements struct {
+	upsertRoomStateStmt             *sql.Stmt
+	deleteRoomStateByEventIDStmt    *sql.Stmt
+	selectRoomIDsWithMembershipStmt *sql.Stmt
+	selectEventsWithEventIDsStmt    *sql.Stmt
+	selectStateEventStmt            *sql.Stmt
+}
+
+func NewPostgresCurrentRoomStateTable(db *sql.DB) (tables.CurrentRoomState, error) {
+	s := &currentRoomStateStatements{}
+	_, err := db.Exec(currentRoomStateSchema)
+	if err != nil {
+		return nil, err
+	}
+	if s.upsertRoomStateStmt, err = db.Prepare(upsertRoomStateSQL); err != nil {
+		return nil, err
+	}
+	if s.deleteRoomStateByEventIDStmt, err = db.Prepare(deleteRoomStateByEventIDSQL); err != nil {
+		return nil, err
+	}
+	if s.selectRoomIDsWithMembershipStmt, err = db.Prepare(selectRoomIDsWithMembershipSQL); err != nil {
+		return nil, err
+	}
+	if s.selectEventsWithEventIDsStmt, err = db.Prepare(selectEventsWithEventIDsSQL); err != nil {
+		return nil, err
+	}
+	if s.selectStateEventStmt, err = db.Prepare(selectStateEventSQL); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
+func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(
+	ctx context.Context,
+	txn *sql.Tx,
+	userID string,
+	membershipEnum int,
+) ([]string, error) {
+	stmt := sqlutil.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
+	rows, err := stmt.QueryContext(ctx, userID, membershipEnum)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "selectRoomIDsWithMembership: rows.close() failed")
+
+	var result []string
+	for rows.Next() {
+		var roomID string
+		if err := rows.Scan(&roomID); err != nil {
+			return nil, err
+		}
+		result = append(result, roomID)
+	}
+	return result, rows.Err()
+}
+
+func (s *currentRoomStateStatements) DeleteRoomStateByEventID(
+	ctx context.Context, txn *sql.Tx, eventID string,
+) error {
+	stmt := sqlutil.TxStmt(txn, s.deleteRoomStateByEventIDStmt)
+	_, err := stmt.ExecContext(ctx, eventID)
+	return err
+}
+
+func (s *currentRoomStateStatements) UpsertRoomState(
+	ctx context.Context, txn *sql.Tx,
+	event gomatrixserverlib.HeaderedEvent, membershipEnum int,
+) error {
+	headeredJSON, err := json.Marshal(event)
+	if err != nil {
+		return err
+	}
+
+	// upsert state event
+	stmt := sqlutil.TxStmt(txn, s.upsertRoomStateStmt)
+	_, err = stmt.ExecContext(
+		ctx,
+		event.RoomID(),
+		event.EventID(),
+		event.Type(),
+		event.Sender(),
+		*event.StateKey(),
+		headeredJSON,
+		membershipEnum,
+	)
+	return err
+}
+
+func (s *currentRoomStateStatements) SelectEventsWithEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]gomatrixserverlib.HeaderedEvent, error) {
+	stmt := sqlutil.TxStmt(txn, s.selectEventsWithEventIDsStmt)
+	rows, err := stmt.QueryContext(ctx, pq.StringArray(eventIDs))
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "selectEventsWithEventIDs: rows.close() failed")
+	result := []gomatrixserverlib.HeaderedEvent{}
+	for rows.Next() {
+		var eventBytes []byte
+		if err := rows.Scan(&eventBytes); err != nil {
+			return nil, err
+		}
+		// TODO: Handle redacted events
+		var ev gomatrixserverlib.HeaderedEvent
+		if err := json.Unmarshal(eventBytes, &ev); err != nil {
+			return nil, err
+		}
+		result = append(result, ev)
+	}
+	return result, rows.Err()
+}
+
+func (s *currentRoomStateStatements) SelectStateEvent(
+	ctx context.Context, roomID, evType, stateKey string,
+) (*gomatrixserverlib.HeaderedEvent, error) {
+	stmt := s.selectStateEventStmt
+	var res []byte
+	err := stmt.QueryRowContext(ctx, roomID, evType, stateKey).Scan(&res)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	var ev gomatrixserverlib.HeaderedEvent
+	if err = json.Unmarshal(res, &ev); err != nil {
+		return nil, err
+	}
+	return &ev, err
+}
--- a/currentstateserver/storage/postgres/storage.go
+++ b/currentstateserver/storage/postgres/storage.go
@ -0,0 +1,35 @@
+package postgres
+
+import (
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/shared"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+)
+
+type Database struct {
+	shared.Database
+	db *sql.DB
+	sqlutil.PartitionOffsetStatements
+}
+
+// NewDatabase creates a new sync server database
+func NewDatabase(dbDataSourceName string, dbProperties sqlutil.DbProperties) (*Database, error) {
+	var d Database
+	var err error
+	if d.db, err = sqlutil.Open("postgres", dbDataSourceName, dbProperties); err != nil {
+		return nil, err
+	}
+	if err = d.PartitionOffsetStatements.Prepare(d.db, "currentstate"); err != nil {
+		return nil, err
+	}
+	currRoomState, err := NewPostgresCurrentRoomStateTable(d.db)
+	if err != nil {
+		return nil, err
+	}
+	d.Database = shared.Database{
+		DB:               d.db,
+		CurrentRoomState: currRoomState,
+	}
+	return &d, nil
+}
--- a/currentstateserver/storage/shared/storage.go
+++ b/currentstateserver/storage/shared/storage.go
@ -0,0 +1,78 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 shared
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/tables"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+type Database struct {
+	DB               *sql.DB
+	CurrentRoomState tables.CurrentRoomState
+}
+
+func (d *Database) GetStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error) {
+	return d.CurrentRoomState.SelectStateEvent(ctx, roomID, evType, stateKey)
+}
+
+func (d *Database) StoreStateEvents(ctx context.Context, addStateEvents []gomatrixserverlib.HeaderedEvent,
+	removeStateEventIDs []string) error {
+	return sqlutil.WithTransaction(d.DB, func(txn *sql.Tx) error {
+		// remove first, then add, as we do not ever delete state, but do replace state which is a remove followed by an add.
+		for _, eventID := range removeStateEventIDs {
+			if err := d.CurrentRoomState.DeleteRoomStateByEventID(ctx, txn, eventID); err != nil {
+				return err
+			}
+		}
+
+		for _, event := range addStateEvents {
+			if event.StateKey() == nil {
+				// ignore non state events
+				continue
+			}
+			var membershipEnum int
+			if event.Type() == "m.room.member" {
+				membership, err := event.Membership()
+				if err != nil {
+					return err
+				}
+				enum, ok := tables.MembershipToEnum[membership]
+				if !ok {
+					return fmt.Errorf("unknown membership: %s", membership)
+				}
+				membershipEnum = enum
+			}
+
+			if err := d.CurrentRoomState.UpsertRoomState(ctx, txn, event, membershipEnum); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+
+func (d *Database) GetRoomsByMembership(ctx context.Context, userID, membership string) ([]string, error) {
+	enum, ok := tables.MembershipToEnum[membership]
+	if !ok {
+		return nil, fmt.Errorf("unknown membership: %s", membership)
+	}
+	return d.CurrentRoomState.SelectRoomIDsWithMembership(ctx, nil, userID, enum)
+}
--- a/currentstateserver/storage/sqlite3/current_room_state_table.go
+++ b/currentstateserver/storage/sqlite3/current_room_state_table.go
@ -0,0 +1,201 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"strings"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/tables"
+	"github.com/matrix-org/dendrite/internal"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+const currentRoomStateSchema = `
+-- Stores the current room state for every room.
+CREATE TABLE IF NOT EXISTS currentstate_current_room_state (
+    room_id TEXT NOT NULL,
+    event_id TEXT NOT NULL,
+    type TEXT NOT NULL,
+    sender TEXT NOT NULL,
+    state_key TEXT NOT NULL,
+    headered_event_json TEXT NOT NULL,
+    membership INTEGER NOT NULL DEFAULT 0,
+    UNIQUE (room_id, type, state_key)
+);
+-- for event deletion
+CREATE UNIQUE INDEX IF NOT EXISTS currentstate_event_id_idx ON currentstate_current_room_state(event_id, room_id, type, sender);
+-- for querying membership states of users
+-- CREATE INDEX IF NOT EXISTS currentstate_membership_idx ON currentstate_current_room_state(type, state_key, membership) WHERE membership IS NOT NULL AND membership != 'leave';
+`
+
+const upsertRoomStateSQL = "" +
+	"INSERT INTO currentstate_current_room_state (room_id, event_id, type, sender, state_key, headered_event_json, membership)" +
+	" VALUES ($1, $2, $3, $4, $5, $6, $7)" +
+	" ON CONFLICT (event_id, room_id, type, sender)" +
+	" DO UPDATE SET event_id = $2, sender=$4, headered_event_json = $6, membership = $7"
+
+const deleteRoomStateByEventIDSQL = "" +
+	"DELETE FROM currentstate_current_room_state WHERE event_id = $1"
+
+const selectRoomIDsWithMembershipSQL = "" +
+	"SELECT room_id FROM currentstate_current_room_state WHERE type = 'm.room.member' AND state_key = $1 AND membership = $2"
+
+const selectStateEventSQL = "" +
+	"SELECT headered_event_json FROM currentstate_current_room_state WHERE room_id = $1 AND type = $2 AND state_key = $3"
+
+const selectEventsWithEventIDsSQL = "" +
+	// TODO: The session_id and transaction_id blanks are here because otherwise
+	// the rowsToStreamEvents expects there to be exactly five columns. We need to
+	// figure out if these really need to be in the DB, and if so, we need a
+	// better permanent fix for this. - neilalexander, 2 Jan 2020
+	"SELECT added_at, headered_event_json, 0 AS session_id, false AS exclude_from_sync, '' AS transaction_id" +
+	" FROM currentstate_current_room_state WHERE event_id IN ($1)"
+
+type currentRoomStateStatements struct {
+	upsertRoomStateStmt             *sql.Stmt
+	deleteRoomStateByEventIDStmt    *sql.Stmt
+	selectRoomIDsWithMembershipStmt *sql.Stmt
+	selectStateEventStmt            *sql.Stmt
+}
+
+func NewSqliteCurrentRoomStateTable(db *sql.DB) (tables.CurrentRoomState, error) {
+	s := &currentRoomStateStatements{}
+	_, err := db.Exec(currentRoomStateSchema)
+	if err != nil {
+		return nil, err
+	}
+	if s.upsertRoomStateStmt, err = db.Prepare(upsertRoomStateSQL); err != nil {
+		return nil, err
+	}
+	if s.deleteRoomStateByEventIDStmt, err = db.Prepare(deleteRoomStateByEventIDSQL); err != nil {
+		return nil, err
+	}
+	if s.selectRoomIDsWithMembershipStmt, err = db.Prepare(selectRoomIDsWithMembershipSQL); err != nil {
+		return nil, err
+	}
+	if s.selectStateEventStmt, err = db.Prepare(selectStateEventSQL); err != nil {
+		return nil, err
+	}
+	return s, nil
+}
+
+// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
+func (s *currentRoomStateStatements) SelectRoomIDsWithMembership(
+	ctx context.Context,
+	txn *sql.Tx,
+	userID string,
+	membershipEnum int,
+) ([]string, error) {
+	stmt := sqlutil.TxStmt(txn, s.selectRoomIDsWithMembershipStmt)
+	rows, err := stmt.QueryContext(ctx, userID, membershipEnum)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "selectRoomIDsWithMembership: rows.close() failed")
+
+	var result []string
+	for rows.Next() {
+		var roomID string
+		if err := rows.Scan(&roomID); err != nil {
+			return nil, err
+		}
+		result = append(result, roomID)
+	}
+	return result, nil
+}
+
+func (s *currentRoomStateStatements) DeleteRoomStateByEventID(
+	ctx context.Context, txn *sql.Tx, eventID string,
+) error {
+	stmt := sqlutil.TxStmt(txn, s.deleteRoomStateByEventIDStmt)
+	_, err := stmt.ExecContext(ctx, eventID)
+	return err
+}
+
+func (s *currentRoomStateStatements) UpsertRoomState(
+	ctx context.Context, txn *sql.Tx,
+	event gomatrixserverlib.HeaderedEvent, membershipEnum int,
+) error {
+	headeredJSON, err := json.Marshal(event)
+	if err != nil {
+		return err
+	}
+
+	// upsert state event
+	stmt := sqlutil.TxStmt(txn, s.upsertRoomStateStmt)
+	_, err = stmt.ExecContext(
+		ctx,
+		event.RoomID(),
+		event.EventID(),
+		event.Type(),
+		event.Sender(),
+		*event.StateKey(),
+		headeredJSON,
+		membershipEnum,
+	)
+	return err
+}
+
+func (s *currentRoomStateStatements) SelectEventsWithEventIDs(
+	ctx context.Context, txn *sql.Tx, eventIDs []string,
+) ([]gomatrixserverlib.HeaderedEvent, error) {
+	iEventIDs := make([]interface{}, len(eventIDs))
+	for k, v := range eventIDs {
+		iEventIDs[k] = v
+	}
+	query := strings.Replace(selectEventsWithEventIDsSQL, "($1)", sqlutil.QueryVariadic(len(iEventIDs)), 1)
+	rows, err := txn.QueryContext(ctx, query, iEventIDs...)
+	if err != nil {
+		return nil, err
+	}
+	defer internal.CloseAndLogIfError(ctx, rows, "selectEventsWithEventIDs: rows.close() failed")
+	result := []gomatrixserverlib.HeaderedEvent{}
+	for rows.Next() {
+		var eventBytes []byte
+		if err := rows.Scan(&eventBytes); err != nil {
+			return nil, err
+		}
+		// TODO: Handle redacted events
+		var ev gomatrixserverlib.HeaderedEvent
+		if err := json.Unmarshal(eventBytes, &ev); err != nil {
+			return nil, err
+		}
+		result = append(result, ev)
+	}
+	return result, nil
+}
+
+func (s *currentRoomStateStatements) SelectStateEvent(
+	ctx context.Context, roomID, evType, stateKey string,
+) (*gomatrixserverlib.HeaderedEvent, error) {
+	stmt := s.selectStateEventStmt
+	var res []byte
+	err := stmt.QueryRowContext(ctx, roomID, evType, stateKey).Scan(&res)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	var ev gomatrixserverlib.HeaderedEvent
+	if err = json.Unmarshal(res, &ev); err != nil {
+		return nil, err
+	}
+	return &ev, err
+}
--- a/currentstateserver/storage/sqlite3/storage.go
+++ b/currentstateserver/storage/sqlite3/storage.go
@ -0,0 +1,39 @@
+package sqlite3
+
+import (
+	"database/sql"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/shared"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+)
+
+type Database struct {
+	shared.Database
+	db *sql.DB
+	sqlutil.PartitionOffsetStatements
+}
+
+// NewDatabase creates a new sync server database
+// nolint: gocyclo
+func NewDatabase(dataSourceName string) (*Database, error) {
+	var d Database
+	cs, err := sqlutil.ParseFileURI(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	if d.db, err = sqlutil.Open(sqlutil.SQLiteDriverName(), cs, nil); err != nil {
+		return nil, err
+	}
+	if err = d.PartitionOffsetStatements.Prepare(d.db, "currentstate"); err != nil {
+		return nil, err
+	}
+	currRoomState, err := NewSqliteCurrentRoomStateTable(d.db)
+	if err != nil {
+		return nil, err
+	}
+	d.Database = shared.Database{
+		DB:               d.db,
+		CurrentRoomState: currRoomState,
+	}
+	return &d, nil
+}
--- a/currentstateserver/storage/storage.go
+++ b/currentstateserver/storage/storage.go
@ -0,0 +1,41 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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.
+
+// +build !wasm
+
+package storage
+
+import (
+	"net/url"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/postgres"
+	"github.com/matrix-org/dendrite/currentstateserver/storage/sqlite3"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+)
+
+// NewDatabase opens a database connection.
+func NewDatabase(dataSourceName string, dbProperties sqlutil.DbProperties) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return postgres.NewDatabase(dataSourceName, dbProperties)
+	}
+	switch uri.Scheme {
+	case "postgres":
+		return postgres.NewDatabase(dataSourceName, dbProperties)
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName)
+	default:
+		return postgres.NewDatabase(dataSourceName, dbProperties)
+	}
+}
--- a/currentstateserver/storage/storage_wasm.go
+++ b/currentstateserver/storage/storage_wasm.go
@ -0,0 +1,42 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 storage
+
+import (
+	"fmt"
+	"net/url"
+
+	"github.com/matrix-org/dendrite/currentstateserver/storage/sqlite3"
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+)
+
+// NewDatabase opens a database connection.
+func NewDatabase(
+	dataSourceName string,
+	dbProperties sqlutil.DbProperties, // nolint:unparam
+) (Database, error) {
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, fmt.Errorf("Cannot use postgres implementation")
+	}
+	switch uri.Scheme {
+	case "postgres":
+		return nil, fmt.Errorf("Cannot use postgres implementation")
+	case "file":
+		return sqlite3.NewDatabase(dataSourceName)
+	default:
+		return nil, fmt.Errorf("Cannot use postgres implementation")
+	}
+}
--- a/currentstateserver/storage/tables/interface.go
+++ b/currentstateserver/storage/tables/interface.go
@ -0,0 +1,44 @@
+// Copyright 2020 The Matrix.org Foundation C.I.C.
+//
+// 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 tables
+
+import (
+	"context"
+	"database/sql"
+
+	"github.com/matrix-org/gomatrixserverlib"
+)
+
+var MembershipToEnum = map[string]int{
+	gomatrixserverlib.Invite: 1,
+	gomatrixserverlib.Join:   2,
+	gomatrixserverlib.Leave:  3,
+	gomatrixserverlib.Ban:    4,
+}
+var EnumToMembership = map[int]string{
+	1: gomatrixserverlib.Invite,
+	2: gomatrixserverlib.Join,
+	3: gomatrixserverlib.Leave,
+	4: gomatrixserverlib.Ban,
+}
+
+type CurrentRoomState interface {
+	SelectStateEvent(ctx context.Context, roomID, evType, stateKey string) (*gomatrixserverlib.HeaderedEvent, error)
+	SelectEventsWithEventIDs(ctx context.Context, txn *sql.Tx, eventIDs []string) ([]gomatrixserverlib.HeaderedEvent, error)
+	UpsertRoomState(ctx context.Context, txn *sql.Tx, event gomatrixserverlib.HeaderedEvent, membershipEnum int) error
+	DeleteRoomStateByEventID(ctx context.Context, txn *sql.Tx, eventID string) error
+	// SelectRoomIDsWithMembership returns the list of room IDs which have the given user in the given membership state.
+	SelectRoomIDsWithMembership(ctx context.Context, txn *sql.Tx, userID string, membershipEnum int) ([]string, error)
+}
--- a/dendrite-config.yaml
+++ b/dendrite-config.yaml
@ -121,6 +121,7 @@ database:
    federation_sender: "postgres://dendrite:itsasecret@localhost/dendrite_federationsender?sslmode=disable"
    appservice: "postgres://dendrite:itsasecret@localhost/dendrite_appservice?sslmode=disable"
    public_rooms_api: "postgres://dendrite:itsasecret@localhost/dendrite_publicroomsapi?sslmode=disable"
+    current_state: "postgres://dendrite:itsasecret@localhost/dendrite_currentstate?sslmode=disable"
    max_open_conns: 100
    max_idle_conns: 2
    conn_max_lifetime: -1
@ -143,6 +144,7 @@ listen:
    key_server: "localhost:7779"
    server_key_api: "localhost:7780"
    user_api: "localhost:7781"
+    current_state_server: "localhost:7782"

 # The configuration for tracing the dendrite components.
 tracing:
--- a/internal/config/config.go
+++ b/internal/config/config.go
@ -160,10 +160,13 @@ type Dendrite struct {
 	// Postgres Config
 	Database struct {
 		// The Account database stores the login details and account information
-		// for local users. It is accessed by the ClientAPI.
+		// for local users. It is accessed by the UserAPI.
 		Account DataSource `yaml:"account"`
+		// The CurrentState database stores the current state of all rooms.
+		// It is accessed by the CurrentStateServer.
+		CurrentState DataSource `yaml:"current_state"`
 		// The Device database stores session information for the devices of logged
-		// in local users. It is accessed by the ClientAPI, the MediaAPI and the SyncAPI.
+		// in local users. It is accessed by the UserAPI.
 		Device DataSource `yaml:"device"`
 		// The MediaAPI database stores information about files uploaded and downloaded
 		// by local users. It is only accessed by the MediaAPI.
@ -222,6 +225,7 @@ type Dendrite struct {
 	Bind struct {
 		MediaAPI         Address `yaml:"media_api"`
 		ClientAPI        Address `yaml:"client_api"`
+		CurrentState     Address `yaml:"current_state_server"`
 		FederationAPI    Address `yaml:"federation_api"`
 		ServerKeyAPI     Address `yaml:"server_key_api"`
 		AppServiceAPI    Address `yaml:"appservice_api"`
@ -238,6 +242,7 @@ type Dendrite struct {
 	Listen struct {
 		MediaAPI         Address `yaml:"media_api"`
 		ClientAPI        Address `yaml:"client_api"`
+		CurrentState     Address `yaml:"current_state_server"`
 		FederationAPI    Address `yaml:"federation_api"`
 		ServerKeyAPI     Address `yaml:"server_key_api"`
 		AppServiceAPI    Address `yaml:"appservice_api"`
@ -601,6 +606,7 @@ func (config *Dendrite) checkDatabase(configErrs *configErrors) {
 	checkNotEmpty(configErrs, "database.media_api", string(config.Database.MediaAPI))
 	checkNotEmpty(configErrs, "database.sync_api", string(config.Database.SyncAPI))
 	checkNotEmpty(configErrs, "database.room_server", string(config.Database.RoomServer))
+	checkNotEmpty(configErrs, "database.current_state", string(config.Database.CurrentState))
 }

 // checkListen verifies the parameters listen.* are valid.
@ -613,6 +619,7 @@ func (config *Dendrite) checkListen(configErrs *configErrors) {
 	checkNotEmpty(configErrs, "listen.edu_server", string(config.Listen.EDUServer))
 	checkNotEmpty(configErrs, "listen.server_key_api", string(config.Listen.EDUServer))
 	checkNotEmpty(configErrs, "listen.user_api", string(config.Listen.UserAPI))
+	checkNotEmpty(configErrs, "listen.current_state_server", string(config.Listen.CurrentState))
 }

 // checkLogging verifies the parameters logging.* are valid.
@ -735,6 +742,15 @@ func (config *Dendrite) UserAPIURL() string {
 	return "http://" + string(config.Listen.UserAPI)
 }

+// CurrentStateAPIURL returns an HTTP URL for where the currentstateserver is listening.
+func (config *Dendrite) CurrentStateAPIURL() string {
+	// Hard code the currentstateserver to talk HTTP for now.
+	// If we support HTTPS we need to think of a practical way to do certificate validation.
+	// People setting up servers shouldn't need to get a certificate valid for the public
+	// internet for an internal API.
+	return "http://" + string(config.Listen.CurrentState)
+}
+
 // EDUServerURL returns an HTTP URL for where the EDU server is listening.
 func (config *Dendrite) EDUServerURL() string {
 	// Hard code the EDU server to talk HTTP for now.
@ -753,7 +769,7 @@ func (config *Dendrite) FederationSenderURL() string {
 	return "http://" + string(config.Listen.FederationSender)
 }

-// FederationSenderURL returns an HTTP URL for where the federation sender is listening.
+// ServerKeyAPIURL returns an HTTP URL for where the federation sender is listening.
 func (config *Dendrite) ServerKeyAPIURL() string {
 	// Hard code the server key API server to talk HTTP for now.
 	// If we support HTTPS we need to think of a practical way to do certificate validation.
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@ -55,6 +55,7 @@ database:
  sync_api: "postgresql:///syn_api"
  room_server: "postgresql:///room_server"
  appservice: "postgresql:///appservice"
+  current_state: "postgresql:///current_state"
 listen:
  room_server: "localhost:7770"
  client_api: "localhost:7771"
@ -64,6 +65,7 @@ listen:
  appservice_api: "localhost:7777"
  edu_server: "localhost:7778"
  user_api: "localhost:7779"
+  current_state_server: "localhost:7775"
 logging:
  - type: "file"
    level: "info"
--- a/internal/setup/base.go
+++ b/internal/setup/base.go
@ -22,6 +22,7 @@ import (
 	"net/url"
 	"time"

+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	"github.com/matrix-org/dendrite/internal/caching"
 	"github.com/matrix-org/dendrite/internal/httputil"
 	"github.com/matrix-org/dendrite/internal/sqlutil"
@ -37,6 +38,7 @@ import (

 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	asinthttp "github.com/matrix-org/dendrite/appservice/inthttp"
+	currentstateinthttp "github.com/matrix-org/dendrite/currentstateserver/inthttp"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	eduinthttp "github.com/matrix-org/dendrite/eduserver/inthttp"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
@ -171,6 +173,15 @@ func (b *BaseDendrite) UserAPIClient() userapi.UserInternalAPI {
 	return userAPI
 }

+// CurrentStateAPIClient returns CurrentStateInternalAPI for hitting the currentstateserver over HTTP.
+func (b *BaseDendrite) CurrentStateAPIClient() currentstateAPI.CurrentStateInternalAPI {
+	stateAPI, err := currentstateinthttp.NewCurrentStateAPIClient(b.Cfg.CurrentStateAPIURL(), b.httpClient)
+	if err != nil {
+		logrus.WithError(err).Panic("UserAPIClient failed", b.httpClient)
+	}
+	return stateAPI
+}
+
 // EDUServerClient returns EDUServerInputAPI for hitting the EDU server over HTTP
 func (b *BaseDendrite) EDUServerClient() eduServerAPI.EDUServerInputAPI {
 	e, err := eduinthttp.NewEDUServerClient(b.Cfg.EDUServerURL(), b.httpClient)
--- a/internal/setup/monolith.go
+++ b/internal/setup/monolith.go
@ -19,6 +19,7 @@ import (
 	"github.com/gorilla/mux"
 	appserviceAPI "github.com/matrix-org/dendrite/appservice/api"
 	"github.com/matrix-org/dendrite/clientapi"
+	currentstateAPI "github.com/matrix-org/dendrite/currentstateserver/api"
 	eduServerAPI "github.com/matrix-org/dendrite/eduserver/api"
 	"github.com/matrix-org/dendrite/federationapi"
 	federationSenderAPI "github.com/matrix-org/dendrite/federationsender/api"
@ -56,6 +57,7 @@ type Monolith struct {
 	RoomserverAPI       roomserverAPI.RoomserverInternalAPI
 	ServerKeyAPI        serverKeyAPI.ServerKeyInternalAPI
 	UserAPI             userapi.UserInternalAPI
+	StateAPI            currentstateAPI.CurrentStateInternalAPI

 	// 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
@ -69,9 +71,9 @@ type Monolith struct {
 // 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,
+		publicMux, m.Config, m.KafkaProducer, m.DeviceDB, m.AccountDB,
 		m.FedClient, m.RoomserverAPI,
-		m.EDUInternalAPI, m.AppserviceAPI, transactions.New(),
+		m.EDUInternalAPI, m.AppserviceAPI, m.StateAPI, transactions.New(),
 		m.FederationSenderAPI, m.UserAPI,
 	)

--- a/userapi/storage/accounts/interface.go
+++ b/userapi/storage/accounts/interface.go
@ -22,7 +22,6 @@ import (
 	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
 	"github.com/matrix-org/dendrite/internal"
 	"github.com/matrix-org/dendrite/userapi/api"
-	"github.com/matrix-org/gomatrixserverlib"
 )

 type Database interface {
@ -36,10 +35,6 @@ type Database interface {
 	// account already exists, it will return nil, ErrUserExists.
 	CreateAccount(ctx context.Context, localpart, plaintextPassword, appserviceID string) (*api.Account, error)
 	CreateGuestAccount(ctx context.Context) (*api.Account, error)
-	UpdateMemberships(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string) error
-	GetMembershipInRoomByLocalpart(ctx context.Context, localpart, roomID string) (authtypes.Membership, error)
-	GetRoomIDsByLocalPart(ctx context.Context, localpart string) ([]string, error)
-	GetMembershipsByLocalpart(ctx context.Context, localpart string) (memberships []authtypes.Membership, err error)
 	SaveAccountData(ctx context.Context, localpart, roomID, dataType string, content json.RawMessage) error
 	GetAccountData(ctx context.Context, localpart string) (global map[string]json.RawMessage, rooms map[string]map[string]json.RawMessage, err error)
 	// GetAccountDataByType returns account data matching a given
--- a/userapi/storage/accounts/postgres/membership_table.go
+++ b/userapi/storage/accounts/postgres/membership_table.go
@ -1,159 +0,0 @@
-// 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 postgres
-
-import (
-	"context"
-	"database/sql"
-
-	"github.com/lib/pq"
-	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
-	"github.com/matrix-org/dendrite/internal"
-)
-
-const membershipSchema = `
-- Stores data about users memberships to rooms.
-CREATE TABLE IF NOT EXISTS account_memberships (
-    -- The Matrix user ID localpart for the member
-    localpart TEXT NOT NULL,
-    -- The room this user is a member of
-    room_id TEXT NOT NULL,
-    -- The ID of the join membership event
-    event_id TEXT NOT NULL,
-
-    -- A user can only be member of a room once
-    PRIMARY KEY (localpart, room_id)
-);
-
-- Use index to process deletion by ID more efficiently
-CREATE UNIQUE INDEX IF NOT EXISTS account_membership_event_id ON account_memberships(event_id);
-`
-
-const insertMembershipSQL = `
-	INSERT INTO account_memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)
-	ON CONFLICT (localpart, room_id) DO UPDATE SET event_id = EXCLUDED.event_id
-`
-
-const selectMembershipsByLocalpartSQL = "" +
-	"SELECT room_id, event_id FROM account_memberships WHERE localpart = $1"
-
-const selectMembershipInRoomByLocalpartSQL = "" +
-	"SELECT event_id FROM account_memberships WHERE localpart = $1 AND room_id = $2"
-
-const selectRoomIDsByLocalPartSQL = "" +
-	"SELECT room_id FROM account_memberships WHERE localpart = $1"
-
-const deleteMembershipsByEventIDsSQL = "" +
-	"DELETE FROM account_memberships WHERE event_id = ANY($1)"
-
-type membershipStatements struct {
-	deleteMembershipsByEventIDsStmt       *sql.Stmt
-	insertMembershipStmt                  *sql.Stmt
-	selectMembershipInRoomByLocalpartStmt *sql.Stmt
-	selectMembershipsByLocalpartStmt      *sql.Stmt
-	selectRoomIDsByLocalPartStmt          *sql.Stmt
-}
-
-func (s *membershipStatements) prepare(db *sql.DB) (err error) {
-	_, err = db.Exec(membershipSchema)
-	if err != nil {
-		return
-	}
-	if s.deleteMembershipsByEventIDsStmt, err = db.Prepare(deleteMembershipsByEventIDsSQL); err != nil {
-		return
-	}
-	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
-		return
-	}
-	if s.selectMembershipInRoomByLocalpartStmt, err = db.Prepare(selectMembershipInRoomByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectRoomIDsByLocalPartStmt, err = db.Prepare(selectRoomIDsByLocalPartSQL); err != nil {
-		return
-	}
-	return
-}
-
-func (s *membershipStatements) insertMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) (err error) {
-	stmt := txn.Stmt(s.insertMembershipStmt)
-	_, err = stmt.ExecContext(ctx, localpart, roomID, eventID)
-	return
-}
-
-func (s *membershipStatements) deleteMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) (err error) {
-	stmt := txn.Stmt(s.deleteMembershipsByEventIDsStmt)
-	_, err = stmt.ExecContext(ctx, pq.StringArray(eventIDs))
-	return
-}
-
-func (s *membershipStatements) selectMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	membership := authtypes.Membership{Localpart: localpart, RoomID: roomID}
-	stmt := s.selectMembershipInRoomByLocalpartStmt
-	err := stmt.QueryRowContext(ctx, localpart, roomID).Scan(&membership.EventID)
-
-	return membership, err
-}
-
-func (s *membershipStatements) selectMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	stmt := s.selectMembershipsByLocalpartStmt
-	rows, err := stmt.QueryContext(ctx, localpart)
-	if err != nil {
-		return
-	}
-
-	memberships = []authtypes.Membership{}
-
-	defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsByLocalpart: rows.close() failed")
-	for rows.Next() {
-		var m authtypes.Membership
-		m.Localpart = localpart
-		if err = rows.Scan(&m.RoomID, &m.EventID); err != nil {
-			return
-		}
-		memberships = append(memberships, m)
-	}
-	return memberships, rows.Err()
-}
-
-func (s *membershipStatements) selectRoomIDsByLocalPart(
-	ctx context.Context, localPart string,
-) ([]string, error) {
-	stmt := s.selectRoomIDsByLocalPartStmt
-	rows, err := stmt.QueryContext(ctx, localPart)
-	if err != nil {
-		return nil, err
-	}
-	roomIDs := []string{}
-	defer rows.Close() // nolint: errcheck
-	for rows.Next() {
-		var roomID string
-		if err = rows.Scan(&roomID); err != nil {
-			return nil, err
-		}
-		roomIDs = append(roomIDs, roomID)
-	}
-	return roomIDs, rows.Err()
-}
--- a/userapi/storage/accounts/postgres/storage.go
+++ b/userapi/storage/accounts/postgres/storage.go
@ -37,7 +37,6 @@ type Database struct {
 	sqlutil.PartitionOffsetStatements
 	accounts     accountsStatements
 	profiles     profilesStatements
-	memberships  membershipStatements
 	accountDatas accountDataStatements
 	threepids    threepidStatements
 	serverName   gomatrixserverlib.ServerName
@ -62,10 +61,6 @@ func NewDatabase(dataSourceName string, dbProperties sqlutil.DbProperties, serve
 	if err = p.prepare(db); err != nil {
 		return nil, err
 	}
-	m := membershipStatements{}
-	if err = m.prepare(db); err != nil {
-		return nil, err
-	}
 	ac := accountDataStatements{}
 	if err = ac.prepare(db); err != nil {
 		return nil, err
@ -74,7 +69,7 @@ func NewDatabase(dataSourceName string, dbProperties sqlutil.DbProperties, serve
 	if err = t.prepare(db); err != nil {
 		return nil, err
 	}
-	return &Database{db, partitions, a, p, m, ac, t, serverName}, nil
+	return &Database{db, partitions, a, p, ac, t, serverName}, nil
 }

 // GetAccountByPassword returns the account associated with the given localpart and password.
@ -179,112 +174,6 @@ func (d *Database) createAccount(
 	return d.accounts.insertAccount(ctx, txn, localpart, hash, appserviceID)
 }

-// SaveMembership saves the user matching a given localpart as a member of a given
-// room. It also stores the ID of the membership event.
-// If a membership already exists between the user and the room, or if the
-// insert fails, returns the SQL error
-func (d *Database) saveMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) error {
-	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
-}
-
-// removeMembershipsByEventIDs removes the memberships corresponding to the
-// `join` membership events IDs in the eventIDs slice.
-// If the removal fails, or if there is no membership to remove, returns an error
-func (d *Database) removeMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) error {
-	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
-}
-
-// UpdateMemberships adds the "join" membership events included in a given state
-// events array, and removes those which ID is included in a given array of events
-// IDs. All of the process is run in a transaction, which commits only once/if every
-// insertion and deletion has been successfully processed.
-// Returns a SQL error if there was an issue with any part of the process
-func (d *Database) UpdateMemberships(
-	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
-) error {
-	return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
-			return err
-		}
-
-		for _, event := range eventsToAdd {
-			if err := d.newMembership(ctx, txn, event); err != nil {
-				return err
-			}
-		}
-
-		return nil
-	})
-}
-
-// GetMembershipInRoomByLocalpart returns the membership for an user
-// matching the given localpart if he is a member of the room matching roomID,
-// if not sql.ErrNoRows is returned.
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
-}
-
-// GetRoomIDsByLocalPart returns an array containing the room ids of all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetRoomIDsByLocalPart(
-	ctx context.Context, localpart string,
-) ([]string, error) {
-	return d.memberships.selectRoomIDsByLocalPart(ctx, localpart)
-}
-
-// GetMembershipsByLocalpart returns an array containing the memberships for all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
-}
-
-// newMembership saves a new membership in the database.
-// If the event isn't a valid m.room.member event with type `join`, does nothing.
-// If an error occurred, returns the SQL error
-func (d *Database) newMembership(
-	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
-) error {
-	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
-		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
-		if err != nil {
-			return err
-		}
-
-		// We only want state events from local users
-		if string(serverName) != string(d.serverName) {
-			return nil
-		}
-
-		eventID := ev.EventID()
-		roomID := ev.RoomID()
-		membership, err := ev.Membership()
-		if err != nil {
-			return err
-		}
-
-		// Only "join" membership events can be considered as new memberships
-		if membership == gomatrixserverlib.Join {
-			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 // SaveAccountData saves new account data for a given user and a given room.
 // If the account data is not specific to a room, the room ID should be an empty string
 // If an account data already exists for a given set (user, room, data type), it will
--- a/userapi/storage/accounts/sqlite3/membership_table.go
+++ b/userapi/storage/accounts/sqlite3/membership_table.go
@ -1,159 +0,0 @@
-// 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 sqlite3
-
-import (
-	"context"
-	"database/sql"
-	"strings"
-
-	"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
-	"github.com/matrix-org/dendrite/internal"
-	"github.com/matrix-org/dendrite/internal/sqlutil"
-)
-
-const membershipSchema = `
-- Stores data about users memberships to rooms.
-CREATE TABLE IF NOT EXISTS account_memberships (
-    -- The Matrix user ID localpart for the member
-    localpart TEXT NOT NULL,
-    -- The room this user is a member of
-    room_id TEXT NOT NULL,
-    -- The ID of the join membership event
-    event_id TEXT NOT NULL,
-
-    -- A user can only be member of a room once
-    PRIMARY KEY (localpart, room_id),
-
-		UNIQUE (event_id)
-);
-`
-
-const insertMembershipSQL = `
-	INSERT INTO account_memberships(localpart, room_id, event_id) VALUES ($1, $2, $3)
-	ON CONFLICT (localpart, room_id) DO UPDATE SET event_id = EXCLUDED.event_id
-`
-
-const selectMembershipsByLocalpartSQL = "" +
-	"SELECT room_id, event_id FROM account_memberships WHERE localpart = $1"
-
-const selectMembershipInRoomByLocalpartSQL = "" +
-	"SELECT event_id FROM account_memberships WHERE localpart = $1 AND room_id = $2"
-
-const selectRoomIDsByLocalPartSQL = "" +
-	"SELECT room_id FROM account_memberships WHERE localpart = $1"
-
-const deleteMembershipsByEventIDsSQL = "" +
-	"DELETE FROM account_memberships WHERE event_id IN ($1)"
-
-type membershipStatements struct {
-	insertMembershipStmt                  *sql.Stmt
-	selectMembershipInRoomByLocalpartStmt *sql.Stmt
-	selectMembershipsByLocalpartStmt      *sql.Stmt
-	selectRoomIDsByLocalPartStmt          *sql.Stmt
-}
-
-func (s *membershipStatements) prepare(db *sql.DB) (err error) {
-	_, err = db.Exec(membershipSchema)
-	if err != nil {
-		return
-	}
-	if s.insertMembershipStmt, err = db.Prepare(insertMembershipSQL); err != nil {
-		return
-	}
-	if s.selectMembershipInRoomByLocalpartStmt, err = db.Prepare(selectMembershipInRoomByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectMembershipsByLocalpartStmt, err = db.Prepare(selectMembershipsByLocalpartSQL); err != nil {
-		return
-	}
-	if s.selectRoomIDsByLocalPartStmt, err = db.Prepare(selectRoomIDsByLocalPartSQL); err != nil {
-		return
-	}
-	return
-}
-
-func (s *membershipStatements) insertMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) (err error) {
-	stmt := txn.Stmt(s.insertMembershipStmt)
-	_, err = stmt.ExecContext(ctx, localpart, roomID, eventID)
-	return
-}
-
-func (s *membershipStatements) deleteMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) (err error) {
-	sqlStr := strings.Replace(deleteMembershipsByEventIDsSQL, "($1)", sqlutil.QueryVariadic(len(eventIDs)), 1)
-	iEventIDs := make([]interface{}, len(eventIDs))
-	for i, e := range eventIDs {
-		iEventIDs[i] = e
-	}
-	_, err = txn.ExecContext(ctx, sqlStr, iEventIDs...)
-	return
-}
-
-func (s *membershipStatements) selectMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	membership := authtypes.Membership{Localpart: localpart, RoomID: roomID}
-	stmt := s.selectMembershipInRoomByLocalpartStmt
-	err := stmt.QueryRowContext(ctx, localpart, roomID).Scan(&membership.EventID)
-
-	return membership, err
-}
-
-func (s *membershipStatements) selectMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	stmt := s.selectMembershipsByLocalpartStmt
-	rows, err := stmt.QueryContext(ctx, localpart)
-	if err != nil {
-		return
-	}
-
-	memberships = []authtypes.Membership{}
-
-	defer internal.CloseAndLogIfError(ctx, rows, "selectMembershipsByLocalpart: rows.close() failed")
-	for rows.Next() {
-		var m authtypes.Membership
-		m.Localpart = localpart
-		if err := rows.Scan(&m.RoomID, &m.EventID); err != nil {
-			return nil, err
-		}
-		memberships = append(memberships, m)
-	}
-
-	return
-}
-func (s *membershipStatements) selectRoomIDsByLocalPart(
-	ctx context.Context, localPart string,
-) ([]string, error) {
-	stmt := s.selectRoomIDsByLocalPartStmt
-	rows, err := stmt.QueryContext(ctx, localPart)
-	if err != nil {
-		return nil, err
-	}
-	roomIDs := []string{}
-	defer rows.Close() // nolint: errcheck
-	for rows.Next() {
-		var roomID string
-		if err = rows.Scan(&roomID); err != nil {
-			return nil, err
-		}
-		roomIDs = append(roomIDs, roomID)
-	}
-	return roomIDs, rows.Err()
-}
--- a/userapi/storage/accounts/sqlite3/storage.go
+++ b/userapi/storage/accounts/sqlite3/storage.go
@ -36,7 +36,6 @@ type Database struct {
 	sqlutil.PartitionOffsetStatements
 	accounts     accountsStatements
 	profiles     profilesStatements
-	memberships  membershipStatements
 	accountDatas accountDataStatements
 	threepids    threepidStatements
 	serverName   gomatrixserverlib.ServerName
@ -67,10 +66,6 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if err = p.prepare(db); err != nil {
 		return nil, err
 	}
-	m := membershipStatements{}
-	if err = m.prepare(db); err != nil {
-		return nil, err
-	}
 	ac := accountDataStatements{}
 	if err = ac.prepare(db); err != nil {
 		return nil, err
@ -79,7 +74,7 @@ func NewDatabase(dataSourceName string, serverName gomatrixserverlib.ServerName)
 	if err = t.prepare(db); err != nil {
 		return nil, err
 	}
-	return &Database{db, partitions, a, p, m, ac, t, serverName, sync.Mutex{}}, nil
+	return &Database{db, partitions, a, p, ac, t, serverName, sync.Mutex{}}, nil
 }

 // GetAccountByPassword returns the account associated with the given localpart and password.
@ -193,112 +188,6 @@ func (d *Database) createAccount(
 	return d.accounts.insertAccount(ctx, txn, localpart, hash, appserviceID)
 }

-// SaveMembership saves the user matching a given localpart as a member of a given
-// room. It also stores the ID of the membership event.
-// If a membership already exists between the user and the room, or if the
-// insert fails, returns the SQL error
-func (d *Database) saveMembership(
-	ctx context.Context, txn *sql.Tx, localpart, roomID, eventID string,
-) error {
-	return d.memberships.insertMembership(ctx, txn, localpart, roomID, eventID)
-}
-
-// removeMembershipsByEventIDs removes the memberships corresponding to the
-// `join` membership events IDs in the eventIDs slice.
-// If the removal fails, or if there is no membership to remove, returns an error
-func (d *Database) removeMembershipsByEventIDs(
-	ctx context.Context, txn *sql.Tx, eventIDs []string,
-) error {
-	return d.memberships.deleteMembershipsByEventIDs(ctx, txn, eventIDs)
-}
-
-// UpdateMemberships adds the "join" membership events included in a given state
-// events array, and removes those which ID is included in a given array of events
-// IDs. All of the process is run in a transaction, which commits only once/if every
-// insertion and deletion has been successfully processed.
-// Returns a SQL error if there was an issue with any part of the process
-func (d *Database) UpdateMemberships(
-	ctx context.Context, eventsToAdd []gomatrixserverlib.Event, idsToRemove []string,
-) error {
-	return sqlutil.WithTransaction(d.db, func(txn *sql.Tx) error {
-		if err := d.removeMembershipsByEventIDs(ctx, txn, idsToRemove); err != nil {
-			return err
-		}
-
-		for _, event := range eventsToAdd {
-			if err := d.newMembership(ctx, txn, event); err != nil {
-				return err
-			}
-		}
-
-		return nil
-	})
-}
-
-// GetMembershipInRoomByLocalpart returns the membership for an user
-// matching the given localpart if he is a member of the room matching roomID,
-// if not sql.ErrNoRows is returned.
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipInRoomByLocalpart(
-	ctx context.Context, localpart, roomID string,
-) (authtypes.Membership, error) {
-	return d.memberships.selectMembershipInRoomByLocalpart(ctx, localpart, roomID)
-}
-
-// GetMembershipsByLocalpart returns an array containing the memberships for all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetMembershipsByLocalpart(
-	ctx context.Context, localpart string,
-) (memberships []authtypes.Membership, err error) {
-	return d.memberships.selectMembershipsByLocalpart(ctx, localpart)
-}
-
-// GetRoomIDsByLocalPart returns an array containing the room ids of all
-// the rooms a user matching a given localpart is a member of
-// If no membership match the given localpart, returns an empty array
-// If there was an issue during the retrieval, returns the SQL error
-func (d *Database) GetRoomIDsByLocalPart(
-	ctx context.Context, localpart string,
-) ([]string, error) {
-	return d.memberships.selectRoomIDsByLocalPart(ctx, localpart)
-}
-
-// newMembership saves a new membership in the database.
-// If the event isn't a valid m.room.member event with type `join`, does nothing.
-// If an error occurred, returns the SQL error
-func (d *Database) newMembership(
-	ctx context.Context, txn *sql.Tx, ev gomatrixserverlib.Event,
-) error {
-	if ev.Type() == "m.room.member" && ev.StateKey() != nil {
-		localpart, serverName, err := gomatrixserverlib.SplitID('@', *ev.StateKey())
-		if err != nil {
-			return err
-		}
-
-		// We only want state events from local users
-		if string(serverName) != string(d.serverName) {
-			return nil
-		}
-
-		eventID := ev.EventID()
-		roomID := ev.RoomID()
-		membership, err := ev.Membership()
-		if err != nil {
-			return err
-		}
-
-		// Only "join" membership events can be considered as new memberships
-		if membership == gomatrixserverlib.Join {
-			if err := d.saveMembership(ctx, txn, localpart, roomID, eventID); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 // SaveAccountData saves new account data for a given user and a given room.
 // If the account data is not specific to a room, the room ID should be an empty string
 // If an account data already exists for a given set (user, room, data type), it will