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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 postgreswithpubsub
import (
"context"
"encoding/json"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/matrix-org/dendrite/publicroomsapi/storage/postgres"
"github.com/matrix-org/gomatrixserverlib"
pubsub "github.com/libp2p/go-libp2p-pubsub"
)
const MaintenanceInterval = time.Second * 10
type discoveredRoom struct {
time time.Time
room gomatrixserverlib.PublicRoom
}
// PublicRoomsServerDatabase represents a public rooms server database.
type PublicRoomsServerDatabase struct {
postgres.PublicRoomsServerDatabase //
pubsub *pubsub.PubSub //
subscription *pubsub.Subscription //
foundRooms map[string]discoveredRoom // additional rooms we have learned about from the DHT
foundRoomsMutex sync.RWMutex // protects foundRooms
maintenanceTimer *time.Timer //
roomsAdvertised atomic.Value // stores int
}
// NewPublicRoomsServerDatabase creates a new public rooms server database.
func NewPublicRoomsServerDatabase(dataSourceName string, pubsub *pubsub.PubSub) (*PublicRoomsServerDatabase, error) {
pg, err := postgres.NewPublicRoomsServerDatabase(dataSourceName)
if err != nil {
return nil, err
}
provider := PublicRoomsServerDatabase{
pubsub: pubsub,
PublicRoomsServerDatabase: *pg,
foundRooms: make(map[string]discoveredRoom),
}
if topic, err := pubsub.Join("/matrix/publicRooms"); err != nil {
return nil, err
} else if sub, err := topic.Subscribe(); err == nil {
provider.subscription = sub
go provider.MaintenanceTimer()
go provider.FindRooms()
provider.roomsAdvertised.Store(0)
return &provider, nil
} else {
return nil, err
}
}
func (d *PublicRoomsServerDatabase) GetRoomVisibility(ctx context.Context, roomID string) (bool, error) {
return d.PublicRoomsServerDatabase.GetRoomVisibility(ctx, roomID)
}
func (d *PublicRoomsServerDatabase) SetRoomVisibility(ctx context.Context, visible bool, roomID string) error {
d.MaintenanceTimer()
return d.PublicRoomsServerDatabase.SetRoomVisibility(ctx, visible, roomID)
}
func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
d.foundRoomsMutex.RLock()
defer d.foundRoomsMutex.RUnlock()
return int64(len(d.foundRooms)), nil
}
func (d *PublicRoomsServerDatabase) GetPublicRooms(ctx context.Context, offset int64, limit int16, filter string) ([]gomatrixserverlib.PublicRoom, error) {
var rooms []gomatrixserverlib.PublicRoom
if filter == "__local__" {
if r, err := d.PublicRoomsServerDatabase.GetPublicRooms(ctx, offset, limit, ""); err == nil {
rooms = append(rooms, r...)
} else {
return []gomatrixserverlib.PublicRoom{}, err
}
} else {
d.foundRoomsMutex.RLock()
defer d.foundRoomsMutex.RUnlock()
for _, room := range d.foundRooms {
rooms = append(rooms, room.room)
}
}
return rooms, nil
}
func (d *PublicRoomsServerDatabase) UpdateRoomFromEvents(ctx context.Context, eventsToAdd []gomatrixserverlib.Event, eventsToRemove []gomatrixserverlib.Event) error {
return d.PublicRoomsServerDatabase.UpdateRoomFromEvents(ctx, eventsToAdd, eventsToRemove)
}
func (d *PublicRoomsServerDatabase) UpdateRoomFromEvent(ctx context.Context, event gomatrixserverlib.Event) error {
return d.PublicRoomsServerDatabase.UpdateRoomFromEvent(ctx, event)
}
func (d *PublicRoomsServerDatabase) MaintenanceTimer() {
if d.maintenanceTimer != nil && !d.maintenanceTimer.Stop() {
<-d.maintenanceTimer.C
}
d.Interval()
}
func (d *PublicRoomsServerDatabase) Interval() {
d.foundRoomsMutex.Lock()
for k, v := range d.foundRooms {
if time.Since(v.time) > time.Minute {
delete(d.foundRooms, k)
}
}
d.foundRoomsMutex.Unlock()
if err := d.AdvertiseRooms(); err != nil {
fmt.Println("Failed to advertise room in DHT:", err)
}
d.foundRoomsMutex.RLock()
defer d.foundRoomsMutex.RUnlock()
fmt.Println("Found", len(d.foundRooms), "room(s), advertised", d.roomsAdvertised.Load(), "room(s)")
d.maintenanceTimer = time.AfterFunc(MaintenanceInterval, d.Interval)
}
func (d *PublicRoomsServerDatabase) AdvertiseRooms() error {
dbCtx, dbCancel := context.WithTimeout(context.Background(), 3*time.Second)
_ = dbCancel
ourRooms, err := d.GetPublicRooms(dbCtx, 0, 1024, "__local__")
if err != nil {
return err
}
advertised := 0
for _, room := range ourRooms {
if j, err := json.Marshal(room); err == nil {
if topic, err := d.pubsub.Join("/matrix/publicRooms"); err != nil {
fmt.Println("Failed to subscribe to topic:", err)
} else if err := topic.Publish(context.TODO(), j); err != nil {
fmt.Println("Failed to publish public room:", err)
} else {
advertised++
}
}
}
d.roomsAdvertised.Store(advertised)
return nil
}
func (d *PublicRoomsServerDatabase) FindRooms() {
for {
msg, err := d.subscription.Next(context.Background())
if err != nil {
continue
}
received := discoveredRoom{
time: time.Now(),
}
if err := json.Unmarshal(msg.Data, &received.room); err != nil {
fmt.Println("Unmarshal error:", err)
continue
}
d.foundRoomsMutex.Lock()
d.foundRooms[received.room.RoomID] = received
d.foundRoomsMutex.Unlock()
}
}
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