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// Copyright 2022 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 relay
import (
"context"
"sync"
"time"
federationAPI "github.com/matrix-org/dendrite/federationapi/api"
relayServerAPI "github.com/matrix-org/dendrite/relayapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/sirupsen/logrus"
"go.uber.org/atomic"
)
const (
relayServerRetryInterval = time.Second * 30
)
type RelayServerRetriever struct {
ctx context.Context
serverName gomatrixserverlib.ServerName
federationAPI federationAPI.FederationInternalAPI
relayAPI relayServerAPI.RelayInternalAPI
relayServersQueried map[gomatrixserverlib.ServerName]bool
queriedServersMutex sync.Mutex
running atomic.Bool
quit <-chan bool
}
func NewRelayServerRetriever(
ctx context.Context,
serverName gomatrixserverlib.ServerName,
federationAPI federationAPI.FederationInternalAPI,
relayAPI relayServerAPI.RelayInternalAPI,
quit <-chan bool,
) RelayServerRetriever {
return RelayServerRetriever{
ctx: ctx,
serverName: serverName,
federationAPI: federationAPI,
relayAPI: relayAPI,
relayServersQueried: make(map[gomatrixserverlib.ServerName]bool),
running: *atomic.NewBool(false),
quit: quit,
}
}
func (r *RelayServerRetriever) InitializeRelayServers(eLog *logrus.Entry) {
request := federationAPI.P2PQueryRelayServersRequest{Server: gomatrixserverlib.ServerName(r.serverName)}
response := federationAPI.P2PQueryRelayServersResponse{}
err := r.federationAPI.P2PQueryRelayServers(r.ctx, &request, &response)
if err != nil {
eLog.Warnf("Failed obtaining list of this node's relay servers: %s", err.Error())
}
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
for _, server := range response.RelayServers {
r.relayServersQueried[server] = false
}
eLog.Infof("Registered relay servers: %v", response.RelayServers)
}
func (r *RelayServerRetriever) SetRelayServers(servers []gomatrixserverlib.ServerName) {
UpdateNodeRelayServers(r.serverName, servers, r.ctx, r.federationAPI)
// Replace list of servers to sync with and mark them all as unsynced.
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
r.relayServersQueried = make(map[gomatrixserverlib.ServerName]bool)
for _, server := range servers {
r.relayServersQueried[server] = false
}
r.StartSync()
}
func (r *RelayServerRetriever) GetRelayServers() []gomatrixserverlib.ServerName {
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
relayServers := []gomatrixserverlib.ServerName{}
for server := range r.relayServersQueried {
relayServers = append(relayServers, server)
}
return relayServers
}
func (r *RelayServerRetriever) GetQueriedServerStatus() map[gomatrixserverlib.ServerName]bool {
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
result := map[gomatrixserverlib.ServerName]bool{}
for server, queried := range r.relayServersQueried {
result[server] = queried
}
return result
}
func (r *RelayServerRetriever) StartSync() {
if !r.running.Load() {
logrus.Info("Starting relay server sync")
go r.SyncRelayServers(r.quit)
}
}
func (r *RelayServerRetriever) IsRunning() bool {
return r.running.Load()
}
func (r *RelayServerRetriever) SyncRelayServers(stop <-chan bool) {
defer r.running.Store(false)
t := time.NewTimer(relayServerRetryInterval)
for {
relayServersToQuery := []gomatrixserverlib.ServerName{}
func() {
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
for server, complete := range r.relayServersQueried {
if !complete {
relayServersToQuery = append(relayServersToQuery, server)
}
}
}()
if len(relayServersToQuery) == 0 {
// All relay servers have been synced.
logrus.Info("Finished syncing with all known relays")
return
}
r.queryRelayServers(relayServersToQuery)
t.Reset(relayServerRetryInterval)
select {
case <-stop:
if !t.Stop() {
<-t.C
}
return
case <-t.C:
}
}
}
func (r *RelayServerRetriever) queryRelayServers(relayServers []gomatrixserverlib.ServerName) {
logrus.Info("Querying relay servers for any available transactions")
for _, server := range relayServers {
userID, err := gomatrixserverlib.NewUserID("@user:"+string(r.serverName), false)
if err != nil {
return
}
logrus.Infof("Syncing with relay: %s", string(server))
err = r.relayAPI.PerformRelayServerSync(context.Background(), *userID, server)
if err == nil {
func() {
r.queriedServersMutex.Lock()
defer r.queriedServersMutex.Unlock()
r.relayServersQueried[server] = true
}()
// TODO : What happens if your relay receives new messages after this point?
// Should you continue to check with them, or should they try and contact you?
// They could send a "new_async_events" message your way maybe?
// Then you could mark them as needing to be queried again.
// What if you miss this message?
// Maybe you should try querying them again after a certain period of time as a backup?
} else {
logrus.Errorf("Failed querying relay server: %s", err.Error())
}
}
}
func UpdateNodeRelayServers(
node gomatrixserverlib.ServerName,
relays []gomatrixserverlib.ServerName,
ctx context.Context,
fedAPI federationAPI.FederationInternalAPI,
) {
// Get the current relay list
request := federationAPI.P2PQueryRelayServersRequest{Server: node}
response := federationAPI.P2PQueryRelayServersResponse{}
err := fedAPI.P2PQueryRelayServers(ctx, &request, &response)
if err != nil {
logrus.Warnf("Failed obtaining list of relay servers for %s: %s", node, err.Error())
}
// Remove old, non-matching relays
var serversToRemove []gomatrixserverlib.ServerName
for _, existingServer := range response.RelayServers {
shouldRemove := true
for _, newServer := range relays {
if newServer == existingServer {
shouldRemove = false
break
}
}
if shouldRemove {
serversToRemove = append(serversToRemove, existingServer)
}
}
removeRequest := federationAPI.P2PRemoveRelayServersRequest{
Server: node,
RelayServers: serversToRemove,
}
removeResponse := federationAPI.P2PRemoveRelayServersResponse{}
err = fedAPI.P2PRemoveRelayServers(ctx, &removeRequest, &removeResponse)
if err != nil {
logrus.Warnf("Failed removing old relay servers for %s: %s", node, err.Error())
}
// Add new relays
addRequest := federationAPI.P2PAddRelayServersRequest{
Server: node,
RelayServers: relays,
}
addResponse := federationAPI.P2PAddRelayServersResponse{}
err = fedAPI.P2PAddRelayServers(ctx, &addRequest, &addResponse)
if err != nil {
logrus.Warnf("Failed adding relay servers for %s: %s", node, err.Error())
}
}
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