147 lines
3.6 KiB
Go
147 lines
3.6 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2019 struktur AG
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*
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* @author Joachim Bauch <bauch@struktur.de>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package signaling
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import (
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"context"
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"errors"
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"log"
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"sync"
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"sync/atomic"
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)
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type BuiltinRoomSessions struct {
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sessionIdToRoomSession map[string]string
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roomSessionToSessionid map[string]string
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mu sync.RWMutex
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clients *GrpcClients
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}
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func NewBuiltinRoomSessions(clients *GrpcClients) (RoomSessions, error) {
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return &BuiltinRoomSessions{
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sessionIdToRoomSession: make(map[string]string),
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roomSessionToSessionid: make(map[string]string),
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clients: clients,
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}, nil
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}
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func (r *BuiltinRoomSessions) SetRoomSession(session Session, roomSessionId string) error {
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if roomSessionId == "" {
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r.DeleteRoomSession(session)
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return nil
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}
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if sid := session.PublicId(); sid != "" {
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r.mu.Lock()
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defer r.mu.Unlock()
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if prev, found := r.sessionIdToRoomSession[sid]; found {
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if prev == roomSessionId {
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return nil
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}
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delete(r.roomSessionToSessionid, prev)
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}
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r.sessionIdToRoomSession[sid] = roomSessionId
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r.roomSessionToSessionid[roomSessionId] = sid
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}
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return nil
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}
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func (r *BuiltinRoomSessions) DeleteRoomSession(session Session) {
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if sid := session.PublicId(); sid != "" {
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r.mu.Lock()
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defer r.mu.Unlock()
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if roomSessionId, found := r.sessionIdToRoomSession[sid]; found {
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delete(r.sessionIdToRoomSession, sid)
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if r.roomSessionToSessionid[roomSessionId] == sid {
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delete(r.roomSessionToSessionid, roomSessionId)
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}
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}
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}
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}
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func (r *BuiltinRoomSessions) GetSessionId(roomSessionId string) (string, error) {
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r.mu.RLock()
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defer r.mu.RUnlock()
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sid, found := r.roomSessionToSessionid[roomSessionId]
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if !found {
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return "", ErrNoSuchRoomSession
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}
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return sid, nil
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}
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func (r *BuiltinRoomSessions) LookupSessionId(ctx context.Context, roomSessionId string, disconnectReason string) (string, error) {
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sid, err := r.GetSessionId(roomSessionId)
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if err == nil {
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return sid, nil
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}
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if r.clients == nil {
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return "", ErrNoSuchRoomSession
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}
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clients := r.clients.GetClients()
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if len(clients) == 0 {
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return "", ErrNoSuchRoomSession
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}
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lookupctx, cancel := context.WithCancel(ctx)
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defer cancel()
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var wg sync.WaitGroup
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var result atomic.Value
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for _, client := range clients {
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wg.Add(1)
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go func(client *GrpcClient) {
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defer wg.Done()
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sid, err := client.LookupSessionId(lookupctx, roomSessionId, disconnectReason)
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if errors.Is(err, context.Canceled) {
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return
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} else if err != nil {
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log.Printf("Received error while checking for room session id %s on %s: %s", roomSessionId, client.Target(), err)
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return
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} else if sid == "" {
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log.Printf("Received empty session id for room session id %s from %s", roomSessionId, client.Target())
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return
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}
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cancel() // Cancel pending RPC calls.
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result.Store(sid)
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}(client)
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}
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wg.Wait()
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value := result.Load()
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if value == nil {
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return "", ErrNoSuchRoomSession
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}
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return value.(string), nil
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}
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