p2p: Implement published rooms (#923)

* Create and glue ExternalPublicRoomsProvider into the public rooms component

This is how we will link p2p stuff to dendrite proper.

* Use gmsl structs rather than our own

* Implement federated public rooms

- Make thirdparty endpoint r0 so riot-web loads the public room list

* Typo

* Missing callsites

cmd/dendrite-monolith-server/main.go

@@ -69,7 +69,7 @@ func main() {
 	)
 	federationapi.SetupFederationAPIComponent(base, accountDB, deviceDB, federation, &keyRing, alias, input, query, asQuery, fedSenderAPI)
 	mediaapi.SetupMediaAPIComponent(base, deviceDB)
-	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query)
+	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query, federation, nil)
 	syncapi.SetupSyncAPIComponent(base, deviceDB, accountDB, query, federation, cfg)
 
 	httpHandler := common.WrapHandlerInCORS(base.APIMux)

cmd/dendrite-public-rooms-api-server/main.go

@@ -28,7 +28,7 @@ func main() {
 
 	_, _, query := base.CreateHTTPRoomserverAPIs()
 
-	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query)
+	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query, nil, nil)
 
 	base.SetupAndServeHTTP(string(base.Cfg.Bind.PublicRoomsAPI), string(base.Cfg.Listen.PublicRoomsAPI))
 

cmd/dendritejs/main.go

@@ -119,6 +119,7 @@ func main() {
 		},
 		KeyDatabase: keyDB,
 	}
+	p2pPublicRoomProvider := NewLibP2PPublicRoomsProvider(node)
 
 	alias, input, query := roomserver.SetupRoomServerComponent(base)
 	typingInputAPI := typingserver.SetupTypingServerComponent(base, cache.NewTypingCache())
@@ -134,7 +135,7 @@ func main() {
 	)
 	federationapi.SetupFederationAPIComponent(base, accountDB, deviceDB, federation, &keyRing, alias, input, query, asQuery, fedSenderAPI)
 	mediaapi.SetupMediaAPIComponent(base, deviceDB)
-	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query)
+	publicroomsapi.SetupPublicRoomsAPIComponent(base, deviceDB, query, federation, p2pPublicRoomProvider)
 	syncapi.SetupSyncAPIComponent(base, deviceDB, accountDB, query, federation, cfg)
 
 	httpHandler := common.WrapHandlerInCORS(base.APIMux)

cmd/dendritejs/publicrooms.go

@@ -0,0 +1,46 @@
+// 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 main
+
+import (
+	"github.com/matrix-org/go-http-js-libp2p/go_http_js_libp2p"
+)
+
+type libp2pPublicRoomsProvider struct {
+	node      *go_http_js_libp2p.P2pLocalNode
+	providers []go_http_js_libp2p.PeerInfo
+}
+
+func NewLibP2PPublicRoomsProvider(node *go_http_js_libp2p.P2pLocalNode) *libp2pPublicRoomsProvider {
+	p := &libp2pPublicRoomsProvider{
+		node: node,
+	}
+	node.RegisterFoundProviders(p.foundProviders)
+	return p
+}
+
+func (p *libp2pPublicRoomsProvider) foundProviders(peerInfos []go_http_js_libp2p.PeerInfo) {
+	p.providers = peerInfos
+}
+
+func (p *libp2pPublicRoomsProvider) Homeservers() []string {
+	result := make([]string, len(p.providers))
+	for i := range p.providers {
+		result[i] = p.providers[i].Id
+	}
+	return result
+}