Pinecone room directory support (early)

build/gobind-pinecone/monolith.go

@@ -18,6 +18,7 @@ import (
 	"github.com/hjson/hjson-go"
 	"github.com/matrix-org/dendrite/appservice"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-pinecone/conn"
+	"github.com/matrix-org/dendrite/cmd/dendrite-demo-pinecone/rooms"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/signing"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
@@ -223,7 +224,7 @@ func (m *DendriteMonolith) Start() {
 		RoomserverAPI:          rsAPI,
 		UserAPI:                userAPI,
 		KeyAPI:                 keyAPI,
-		ExtPublicRoomsProvider: nil,
+		ExtPublicRoomsProvider: rooms.NewPineconeRoomProvider(pSwitch, pRouter, pQUIC, fsAPI, federation),
 	}
 	monolith.AddAllPublicRoutes(
 		base.PublicClientAPIMux,

cmd/dendrite-demo-pinecone/embed/embed_riotweb.go

@@ -36,12 +36,12 @@ func (h mimeFixingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func Embed(rootMux *mux.Router, listenPort int, serverName string) {
-	url := fmt.Sprintf("http://localhost:%d", listenPort)
 	embeddedFS := _escFS(false)
 	embeddedServ := mimeFixingHandler{http.FileServer(embeddedFS)}
 
 	rootMux.NotFoundHandler = embeddedServ
-	rootMux.HandleFunc("/config.json", func(w http.ResponseWriter, _ *http.Request) {
+	rootMux.HandleFunc("/config.json", func(w http.ResponseWriter, r *http.Request) {
+		url := fmt.Sprintf("http://%s:%d", r.Header("Host"), listenPort)
 		configFile, err := embeddedFS.Open("/config.sample.json")
 		if err != nil {
 			w.WriteHeader(500)

cmd/dendrite-demo-pinecone/main.go

@@ -32,6 +32,7 @@ import (
 	"github.com/matrix-org/dendrite/appservice"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-pinecone/conn"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-pinecone/embed"
+	"github.com/matrix-org/dendrite/cmd/dendrite-demo-pinecone/rooms"
 	"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/signing"
 	"github.com/matrix-org/dendrite/eduserver"
 	"github.com/matrix-org/dendrite/eduserver/cache"
@@ -174,6 +175,7 @@ func main() {
 		RoomserverAPI:          rsAPI,
 		UserAPI:                userAPI,
 		KeyAPI:                 keyAPI,
+		ExtPublicRoomsProvider: rooms.NewPineconeRoomProvider(pSwitch, pRouter, pQUIC, fsAPI, federation),
 	}
 	monolith.AddAllPublicRoutes(
 		base.PublicClientAPIMux,

cmd/dendrite-demo-pinecone/rooms/rooms.go

@@ -0,0 +1,148 @@
+// 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 rooms
+
+import (
+	"context"
+	"crypto/ed25519"
+	"encoding/hex"
+	"sync"
+	"time"
+
+	"github.com/matrix-org/dendrite/federationsender/api"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/matrix-org/util"
+
+	pineconeSwitch "github.com/matrix-org/pinecone/packetswitch"
+	pineconeRouter "github.com/matrix-org/pinecone/router"
+	pineconeSessions "github.com/matrix-org/pinecone/sessions"
+)
+
+type PineconeRoomProvider struct {
+	s         *pineconeSwitch.Switch
+	r         *pineconeRouter.Router
+	q         *pineconeSessions.QUIC
+	fedSender api.FederationSenderInternalAPI
+	fedClient *gomatrixserverlib.FederationClient
+}
+
+func NewPineconeRoomProvider(
+	s *pineconeSwitch.Switch,
+	r *pineconeRouter.Router,
+	q *pineconeSessions.QUIC,
+	fedSender api.FederationSenderInternalAPI,
+	fedClient *gomatrixserverlib.FederationClient,
+) *PineconeRoomProvider {
+	p := &PineconeRoomProvider{
+		s:         s,
+		r:         r,
+		q:         q,
+		fedSender: fedSender,
+		fedClient: fedClient,
+	}
+	return p
+}
+
+func (p *PineconeRoomProvider) Rooms() []gomatrixserverlib.PublicRoom {
+	known := []ed25519.PublicKey{}
+	known = append(known, p.s.KnownNodes()...)
+	if successor := p.r.DHTSuccessor(); successor != nil {
+		known = append(known, successor)
+	}
+	if predecessor := p.r.DHTPredecessor(); predecessor != nil {
+		known = append(known, predecessor)
+	}
+	known = append(known, p.q.Sessions()...)
+	list := []gomatrixserverlib.ServerName{}
+	for _, k := range known {
+		if len(k) == ed25519.PublicKeySize {
+			list = append(list, gomatrixserverlib.ServerName(hex.EncodeToString(k)))
+		}
+	}
+	return bulkFetchPublicRoomsFromServers(context.Background(), p.fedClient, list)
+}
+
+// bulkFetchPublicRoomsFromServers fetches public rooms from the list of homeservers.
+// Returns a list of public rooms.
+func bulkFetchPublicRoomsFromServers(
+	ctx context.Context, fedClient *gomatrixserverlib.FederationClient,
+	homeservers []gomatrixserverlib.ServerName,
+) (publicRooms []gomatrixserverlib.PublicRoom) {
+	limit := 200
+	// follow pipeline semantics, see https://blog.golang.org/pipelines for more info.
+	// goroutines send rooms to this channel
+	roomCh := make(chan gomatrixserverlib.PublicRoom, int(limit))
+	// signalling channel to tell goroutines to stop sending rooms and quit
+	done := make(chan bool)
+	// signalling to say when we can close the room channel
+	var wg sync.WaitGroup
+	wg.Add(len(homeservers))
+	// concurrently query for public rooms
+	for _, hs := range homeservers {
+		go func(homeserverDomain gomatrixserverlib.ServerName) {
+			defer wg.Done()
+			util.GetLogger(ctx).WithField("hs", homeserverDomain).Info("Querying HS for public rooms")
+			fres, err := fedClient.GetPublicRooms(ctx, homeserverDomain, int(limit), "", false, "")
+			if err != nil {
+				util.GetLogger(ctx).WithError(err).WithField("hs", homeserverDomain).Warn(
+					"bulkFetchPublicRoomsFromServers: failed to query hs",
+				)
+				return
+			}
+			for _, room := range fres.Chunk {
+				// atomically send a room or stop
+				select {
+				case roomCh <- room:
+				case <-done:
+					util.GetLogger(ctx).WithError(err).WithField("hs", homeserverDomain).Info("Interrupted whilst sending rooms")
+					return
+				}
+			}
+		}(hs)
+	}
+
+	// Close the room channel when the goroutines have quit so we don't leak, but don't let it stop the in-flight request.
+	// This also allows the request to fail fast if all HSes experience errors as it will cause the room channel to be
+	// closed.
+	go func() {
+		wg.Wait()
+		util.GetLogger(ctx).Info("Cleaning up resources")
+		close(roomCh)
+	}()
+
+	// fan-in results with timeout. We stop when we reach the limit.
+FanIn:
+	for len(publicRooms) < int(limit) || limit == 0 {
+		// add a room or timeout
+		select {
+		case room, ok := <-roomCh:
+			if !ok {
+				util.GetLogger(ctx).Info("All homeservers have been queried, returning results.")
+				break FanIn
+			}
+			publicRooms = append(publicRooms, room)
+		case <-time.After(5 * time.Second): // we've waited long enough, let's tell the client what we got.
+			util.GetLogger(ctx).Info("Waited 5s for federated public rooms, returning early")
+			break FanIn
+		case <-ctx.Done(): // the client hung up on us, let's stop.
+			util.GetLogger(ctx).Info("Client hung up, returning early")
+			break FanIn
+		}
+	}
+	// tell goroutines to stop
+	close(done)
+
+	return publicRooms
+}