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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 postgreswithdht
import (
"context"
"encoding/json"
"fmt"
"sync"
"sync/atomic"
"time"
"github.com/matrix-org/dendrite/publicroomsapi/storage/postgres"
"github.com/matrix-org/gomatrixserverlib"
dht "github.com/libp2p/go-libp2p-kad-dht"
)
const DHTInterval = time.Second * 10
// PublicRoomsServerDatabase represents a public rooms server database.
type PublicRoomsServerDatabase struct {
dht *dht.IpfsDHT
postgres.PublicRoomsServerDatabase
ourRoomsContext context.Context // our current value in the DHT
ourRoomsCancel context.CancelFunc // cancel when we want to expire our value
foundRooms map[string]gomatrixserverlib.PublicRoom // additional rooms we have learned about from the DHT
foundRoomsMutex sync.RWMutex // protects foundRooms
maintenanceTimer *time.Timer //
roomsAdvertised atomic.Value // stores int
roomsDiscovered atomic.Value // stores int
}
// NewPublicRoomsServerDatabase creates a new public rooms server database.
func NewPublicRoomsServerDatabase(dataSourceName string, dht *dht.IpfsDHT) (*PublicRoomsServerDatabase, error) {
pg, err := postgres.NewPublicRoomsServerDatabase(dataSourceName, nil)
if err != nil {
return nil, err
}
provider := PublicRoomsServerDatabase{
dht: dht,
PublicRoomsServerDatabase: *pg,
}
go provider.ResetDHTMaintenance()
provider.roomsAdvertised.Store(0)
provider.roomsDiscovered.Store(0)
return &provider, nil
}
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.ResetDHTMaintenance()
return d.PublicRoomsServerDatabase.SetRoomVisibility(ctx, visible, roomID)
}
func (d *PublicRoomsServerDatabase) CountPublicRooms(ctx context.Context) (int64, error) {
count, err := d.PublicRoomsServerDatabase.CountPublicRooms(ctx)
if err != nil {
return 0, err
}
d.foundRoomsMutex.RLock()
defer d.foundRoomsMutex.RUnlock()
return count + int64(len(d.foundRooms)), nil
}
func (d *PublicRoomsServerDatabase) GetPublicRooms(ctx context.Context, offset int64, limit int16, filter string) ([]gomatrixserverlib.PublicRoom, error) {
realfilter := filter
if realfilter == "__local__" {
realfilter = ""
}
rooms, err := d.PublicRoomsServerDatabase.GetPublicRooms(ctx, offset, limit, realfilter)
if err != nil {
return []gomatrixserverlib.PublicRoom{}, err
}
if filter != "__local__" {
d.foundRoomsMutex.RLock()
defer d.foundRoomsMutex.RUnlock()
for _, room := range d.foundRooms {
rooms = append(rooms, 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) ResetDHTMaintenance() {
if d.maintenanceTimer != nil && !d.maintenanceTimer.Stop() {
<-d.maintenanceTimer.C
}
d.Interval()
}
func (d *PublicRoomsServerDatabase) Interval() {
if err := d.AdvertiseRoomsIntoDHT(); err != nil {
// fmt.Println("Failed to advertise room in DHT:", err)
}
if err := d.FindRoomsInDHT(); err != nil {
// fmt.Println("Failed to find rooms in DHT:", err)
}
fmt.Println("Found", d.roomsDiscovered.Load(), "room(s), advertised", d.roomsAdvertised.Load(), "room(s)")
d.maintenanceTimer = time.AfterFunc(DHTInterval, d.Interval)
}
func (d *PublicRoomsServerDatabase) AdvertiseRoomsIntoDHT() error {
dbCtx, dbCancel := context.WithTimeout(context.Background(), 3*time.Second)
_ = dbCancel
ourRooms, err := d.GetPublicRooms(dbCtx, 0, 1024, "__local__")
if err != nil {
return err
}
if j, err := json.Marshal(ourRooms); err == nil {
d.roomsAdvertised.Store(len(ourRooms))
d.ourRoomsContext, d.ourRoomsCancel = context.WithCancel(context.Background())
if err := d.dht.PutValue(d.ourRoomsContext, "/matrix/publicRooms", j); err != nil {
return err
}
}
return nil
}
func (d *PublicRoomsServerDatabase) FindRoomsInDHT() error {
d.foundRoomsMutex.Lock()
searchCtx, searchCancel := context.WithTimeout(context.Background(), 10*time.Second)
defer searchCancel()
defer d.foundRoomsMutex.Unlock()
results, err := d.dht.GetValues(searchCtx, "/matrix/publicRooms", 1024)
if err != nil {
return err
}
d.foundRooms = make(map[string]gomatrixserverlib.PublicRoom)
for _, result := range results {
var received []gomatrixserverlib.PublicRoom
if err := json.Unmarshal(result.Val, &received); err != nil {
return err
}
for _, room := range received {
d.foundRooms[room.RoomID] = room
}
}
d.roomsDiscovered.Store(len(d.foundRooms))
return nil
}
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