127 lines
4.1 KiB
Go
127 lines
4.1 KiB
Go
// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package yggrooms
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import (
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"context"
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"sync"
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"time"
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"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/yggconn"
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"github.com/matrix-org/dendrite/federationapi/api"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/matrix-org/gomatrixserverlib/fclient"
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"github.com/matrix-org/util"
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)
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type YggdrasilRoomProvider struct {
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node *yggconn.Node
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fedSender api.FederationInternalAPI
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fedClient *fclient.FederationClient
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}
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func NewYggdrasilRoomProvider(
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node *yggconn.Node, fedSender api.FederationInternalAPI, fedClient *fclient.FederationClient,
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) *YggdrasilRoomProvider {
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p := &YggdrasilRoomProvider{
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node: node,
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fedSender: fedSender,
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fedClient: fedClient,
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}
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return p
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}
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func (p *YggdrasilRoomProvider) Rooms() []fclient.PublicRoom {
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return bulkFetchPublicRoomsFromServers(
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context.Background(), p.fedClient,
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gomatrixserverlib.ServerName(p.node.DerivedServerName()),
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p.node.KnownNodes(),
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)
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}
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// bulkFetchPublicRoomsFromServers fetches public rooms from the list of homeservers.
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// Returns a list of public rooms.
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func bulkFetchPublicRoomsFromServers(
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ctx context.Context, fedClient *fclient.FederationClient,
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origin gomatrixserverlib.ServerName,
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homeservers []gomatrixserverlib.ServerName,
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) (publicRooms []fclient.PublicRoom) {
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limit := 200
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// follow pipeline semantics, see https://blog.golang.org/pipelines for more info.
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// goroutines send rooms to this channel
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roomCh := make(chan fclient.PublicRoom, int(limit))
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// signalling channel to tell goroutines to stop sending rooms and quit
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done := make(chan bool)
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// signalling to say when we can close the room channel
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var wg sync.WaitGroup
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wg.Add(len(homeservers))
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// concurrently query for public rooms
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for _, hs := range homeservers {
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go func(homeserverDomain gomatrixserverlib.ServerName) {
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defer wg.Done()
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util.GetLogger(ctx).WithField("hs", homeserverDomain).Info("Querying HS for public rooms")
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fres, err := fedClient.GetPublicRooms(ctx, origin, homeserverDomain, int(limit), "", false, "")
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if err != nil {
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util.GetLogger(ctx).WithError(err).WithField("hs", homeserverDomain).Warn(
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"bulkFetchPublicRoomsFromServers: failed to query hs",
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)
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return
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}
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for _, room := range fres.Chunk {
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// atomically send a room or stop
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select {
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case roomCh <- room:
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case <-done:
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util.GetLogger(ctx).WithError(err).WithField("hs", homeserverDomain).Info("Interrupted whilst sending rooms")
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return
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}
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}
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}(hs)
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}
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// Close the room channel when the goroutines have quit so we don't leak, but don't let it stop the in-flight request.
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// This also allows the request to fail fast if all HSes experience errors as it will cause the room channel to be
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// closed.
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go func() {
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wg.Wait()
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util.GetLogger(ctx).Info("Cleaning up resources")
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close(roomCh)
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}()
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// fan-in results with timeout. We stop when we reach the limit.
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FanIn:
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for len(publicRooms) < int(limit) || limit == 0 {
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// add a room or timeout
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select {
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case room, ok := <-roomCh:
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if !ok {
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util.GetLogger(ctx).Info("All homeservers have been queried, returning results.")
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break FanIn
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}
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publicRooms = append(publicRooms, room)
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case <-time.After(5 * time.Second): // we've waited long enough, let's tell the client what we got.
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util.GetLogger(ctx).Info("Waited 5s for federated public rooms, returning early")
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break FanIn
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case <-ctx.Done(): // the client hung up on us, let's stop.
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util.GetLogger(ctx).Info("Client hung up, returning early")
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break FanIn
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}
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}
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// tell goroutines to stop
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close(done)
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return publicRooms
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}
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