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// 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 yggrooms
import (
"context"
"sync"
"time"
"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/yggconn"
"github.com/matrix-org/dendrite/federationapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
)
type YggdrasilRoomProvider struct {
node *yggconn.Node
fedSender api.FederationInternalAPI
fedClient *gomatrixserverlib.FederationClient
}
func NewYggdrasilRoomProvider(
node *yggconn.Node, fedSender api.FederationInternalAPI, fedClient *gomatrixserverlib.FederationClient,
) *YggdrasilRoomProvider {
p := &YggdrasilRoomProvider{
node: node,
fedSender: fedSender,
fedClient: fedClient,
}
return p
}
func (p *YggdrasilRoomProvider) Rooms() []gomatrixserverlib.PublicRoom {
return bulkFetchPublicRoomsFromServers(
context.Background(), p.fedClient,
gomatrixserverlib.ServerName(p.node.DerivedServerName()),
p.node.KnownNodes(),
)
}
// bulkFetchPublicRoomsFromServers fetches public rooms from the list of homeservers.
// Returns a list of public rooms.
func bulkFetchPublicRoomsFromServers(
ctx context.Context, fedClient *gomatrixserverlib.FederationClient,
origin gomatrixserverlib.ServerName,
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, origin, 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
}
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