mirror of
https://github.com/strukturag/nextcloud-spreed-signaling
synced 2024-06-08 00:42:25 +02:00
470 lines
12 KiB
Go
470 lines
12 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2022 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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"encoding/json"
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"fmt"
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"log"
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"net"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/dlintw/goconf"
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clientv3 "go.etcd.io/etcd/client/v3"
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"google.golang.org/grpc"
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codes "google.golang.org/grpc/codes"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/credentials/insecure"
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status "google.golang.org/grpc/status"
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)
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const (
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GrpcTargetTypeStatic = "static"
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GrpcTargetTypeEtcd = "etcd"
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DefaultGrpcTargetType = GrpcTargetTypeStatic
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)
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func init() {
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RegisterGrpcClientStats()
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}
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type grpcClientImpl struct {
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RpcMcuClient
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RpcSessionsClient
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}
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func newGrpcClientImpl(conn grpc.ClientConnInterface) *grpcClientImpl {
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return &grpcClientImpl{
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RpcMcuClient: NewRpcMcuClient(conn),
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RpcSessionsClient: NewRpcSessionsClient(conn),
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}
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}
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type GrpcClient struct {
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conn *grpc.ClientConn
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impl *grpcClientImpl
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}
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func NewGrpcClient(target string, opts ...grpc.DialOption) (*GrpcClient, error) {
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conn, err := grpc.Dial(target, opts...)
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if err != nil {
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return nil, err
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}
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result := &GrpcClient{
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conn: conn,
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impl: newGrpcClientImpl(conn),
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}
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return result, nil
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}
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func (c *GrpcClient) Target() string {
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return c.conn.Target()
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}
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func (c *GrpcClient) Close() error {
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return c.conn.Close()
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}
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func (c *GrpcClient) LookupSessionId(ctx context.Context, roomSessionId string) (string, error) {
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statsGrpcClientCalls.WithLabelValues("LookupSessionId").Inc()
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// TODO: Remove debug logging
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log.Printf("Lookup room session %s on %s", roomSessionId, c.Target())
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response, err := c.impl.LookupSessionId(ctx, &LookupSessionIdRequest{
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RoomSessionId: roomSessionId,
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}, grpc.WaitForReady(true))
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if s, ok := status.FromError(err); ok && s.Code() == codes.NotFound {
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return "", ErrNoSuchRoomSession
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} else if err != nil {
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return "", err
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}
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sessionId := response.GetSessionId()
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if sessionId == "" {
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return "", ErrNoSuchRoomSession
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}
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return sessionId, nil
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}
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func (c *GrpcClient) IsSessionInCall(ctx context.Context, sessionId string, room *Room) (bool, error) {
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statsGrpcClientCalls.WithLabelValues("IsSessionInCall").Inc()
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// TODO: Remove debug logging
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log.Printf("Check if session %s is in call %s on %s", sessionId, room.Id(), c.Target())
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response, err := c.impl.IsSessionInCall(ctx, &IsSessionInCallRequest{
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SessionId: sessionId,
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RoomId: room.Id(),
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BackendUrl: room.Backend().url,
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}, grpc.WaitForReady(true))
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if s, ok := status.FromError(err); ok && s.Code() == codes.NotFound {
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return false, nil
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} else if err != nil {
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return false, err
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}
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return response.GetInCall(), nil
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}
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func (c *GrpcClient) GetPublisherId(ctx context.Context, sessionId string, streamType string) (string, string, net.IP, error) {
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statsGrpcClientCalls.WithLabelValues("GetPublisherId").Inc()
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// TODO: Remove debug logging
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log.Printf("Get %s publisher id %s on %s", streamType, sessionId, c.Target())
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response, err := c.impl.GetPublisherId(ctx, &GetPublisherIdRequest{
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SessionId: sessionId,
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StreamType: streamType,
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}, grpc.WaitForReady(true))
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if s, ok := status.FromError(err); ok && s.Code() == codes.NotFound {
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return "", "", nil, nil
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} else if err != nil {
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return "", "", nil, err
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}
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return response.GetPublisherId(), response.GetProxyUrl(), net.ParseIP(response.GetIp()), nil
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}
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type GrpcClients struct {
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mu sync.RWMutex
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clientsMap map[string]*GrpcClient
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clients []*GrpcClient
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etcdClient *EtcdClient
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targetPrefix string
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targetSelf string
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targetInformation map[string]*GrpcTargetInformationEtcd
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dialOptions atomic.Value // []grpc.DialOption
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initializedCtx context.Context
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initializedFunc context.CancelFunc
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wakeupChanForTesting chan bool
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}
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func NewGrpcClients(config *goconf.ConfigFile, etcdClient *EtcdClient) (*GrpcClients, error) {
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initializedCtx, initializedFunc := context.WithCancel(context.Background())
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result := &GrpcClients{
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etcdClient: etcdClient,
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initializedCtx: initializedCtx,
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initializedFunc: initializedFunc,
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}
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if err := result.load(config); err != nil {
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return nil, err
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}
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return result, nil
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}
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func (c *GrpcClients) load(config *goconf.ConfigFile) error {
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var opts []grpc.DialOption
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caFile, _ := config.GetString("grpc", "ca")
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if caFile != "" {
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creds, err := credentials.NewClientTLSFromFile(caFile, "")
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if err != nil {
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return fmt.Errorf("invalid GRPC CA in %s: %w", caFile, err)
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}
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opts = append(opts, grpc.WithTransportCredentials(creds))
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} else {
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log.Printf("WARNING: No GRPC CA configured, expecting unencrypted connections")
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opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
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}
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targetType, _ := config.GetString("grpc", "targettype")
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if targetType == "" {
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targetType = DefaultGrpcTargetType
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}
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switch targetType {
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case GrpcTargetTypeStatic:
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return c.loadTargetsStatic(config, opts...)
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case GrpcTargetTypeEtcd:
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return c.loadTargetsEtcd(config, opts...)
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default:
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return fmt.Errorf("unknown GRPC target type: %s", targetType)
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}
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}
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func (c *GrpcClients) loadTargetsStatic(config *goconf.ConfigFile, opts ...grpc.DialOption) error {
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c.mu.Lock()
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defer c.mu.Unlock()
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clientsMap := make(map[string]*GrpcClient)
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var clients []*GrpcClient
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removeTargets := make(map[string]bool, len(c.clientsMap))
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for target, client := range c.clientsMap {
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removeTargets[target] = true
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clientsMap[target] = client
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}
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targets, _ := config.GetString("grpc", "targets")
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for _, target := range strings.Split(targets, ",") {
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target = strings.TrimSpace(target)
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if target == "" {
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continue
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}
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if client, found := clientsMap[target]; found {
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clients = append(clients, client)
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delete(removeTargets, target)
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continue
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}
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client, err := NewGrpcClient(target, opts...)
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if err != nil {
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for target, client := range clientsMap {
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if closeerr := client.Close(); closeerr != nil {
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log.Printf("Error closing client to %s: %s", target, closeerr)
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}
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}
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return err
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}
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log.Printf("Adding %s as GRPC target", target)
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clientsMap[target] = client
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clients = append(clients, client)
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}
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for target := range removeTargets {
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if client, found := clientsMap[target]; found {
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log.Printf("Deleting GRPC target %s", target)
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if err := client.Close(); err != nil {
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log.Printf("Error closing client to %s: %s", target, err)
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}
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delete(clientsMap, target)
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}
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}
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c.clients = clients
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c.clientsMap = clientsMap
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c.initializedFunc()
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statsGrpcClients.Set(float64(len(clients)))
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return nil
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}
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func (c *GrpcClients) loadTargetsEtcd(config *goconf.ConfigFile, opts ...grpc.DialOption) error {
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if !c.etcdClient.IsConfigured() {
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return fmt.Errorf("No etcd endpoints configured")
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}
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targetPrefix, _ := config.GetString("grpc", "targetprefix")
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if targetPrefix == "" {
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return fmt.Errorf("No GRPC target prefix configured")
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}
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c.targetPrefix = targetPrefix
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if c.targetInformation == nil {
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c.targetInformation = make(map[string]*GrpcTargetInformationEtcd)
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}
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targetSelf, _ := config.GetString("grpc", "targetself")
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c.targetSelf = targetSelf
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if opts == nil {
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opts = make([]grpc.DialOption, 0)
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}
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c.dialOptions.Store(opts)
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c.etcdClient.AddListener(c)
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return nil
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}
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func (c *GrpcClients) EtcdClientCreated(client *EtcdClient) {
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go func() {
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if err := client.Watch(context.Background(), c.targetPrefix, c, clientv3.WithPrefix()); err != nil {
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log.Printf("Error processing watch for %s: %s", c.targetPrefix, err)
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}
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}()
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go func() {
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client.WaitForConnection()
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waitDelay := initialWaitDelay
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for {
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response, err := c.getGrpcTargets(client, c.targetPrefix)
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if err != nil {
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if err == context.DeadlineExceeded {
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log.Printf("Timeout getting initial list of GRPC targets, retry in %s", waitDelay)
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} else {
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log.Printf("Could not get initial list of GRPC targets, retry in %s: %s", waitDelay, err)
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}
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time.Sleep(waitDelay)
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waitDelay = waitDelay * 2
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if waitDelay > maxWaitDelay {
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waitDelay = maxWaitDelay
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}
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continue
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}
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for _, ev := range response.Kvs {
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c.EtcdKeyUpdated(client, string(ev.Key), ev.Value)
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}
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c.initializedFunc()
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return
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}
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}()
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}
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func (c *GrpcClients) getGrpcTargets(client *EtcdClient, targetPrefix string) (*clientv3.GetResponse, error) {
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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return client.Get(ctx, targetPrefix, clientv3.WithPrefix())
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}
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func (c *GrpcClients) EtcdKeyUpdated(client *EtcdClient, key string, data []byte) {
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var info GrpcTargetInformationEtcd
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if err := json.Unmarshal(data, &info); err != nil {
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log.Printf("Could not decode GRPC target %s=%s: %s", key, string(data), err)
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return
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}
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if err := info.CheckValid(); err != nil {
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log.Printf("Received invalid GRPC target %s=%s: %s", key, string(data), err)
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return
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}
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c.mu.Lock()
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defer c.mu.Unlock()
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prev, found := c.targetInformation[key]
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if found && prev.Address != info.Address {
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// Address of endpoint has changed, remove old one.
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c.removeEtcdClientLocked(key)
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}
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if c.targetSelf != "" && info.Address == c.targetSelf {
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log.Printf("GRPC target %s is this server, ignoring %s", info.Address, key)
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c.wakeupForTesting()
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return
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}
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if _, found := c.clientsMap[info.Address]; found {
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log.Printf("GRPC target %s already exists, ignoring %s", info.Address, key)
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return
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}
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opts := c.dialOptions.Load().([]grpc.DialOption)
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cl, err := NewGrpcClient(info.Address, opts...)
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if err != nil {
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log.Printf("Could not create GRPC client for target %s: %s", info.Address, err)
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return
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}
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log.Printf("Adding %s as GRPC target", info.Address)
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if c.clientsMap == nil {
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c.clientsMap = make(map[string]*GrpcClient)
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}
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c.clientsMap[info.Address] = cl
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c.clients = append(c.clients, cl)
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c.targetInformation[key] = &info
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statsGrpcClients.Inc()
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c.wakeupForTesting()
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}
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func (c *GrpcClients) EtcdKeyDeleted(client *EtcdClient, key string) {
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c.mu.Lock()
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defer c.mu.Unlock()
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c.removeEtcdClientLocked(key)
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}
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func (c *GrpcClients) removeEtcdClientLocked(key string) {
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info, found := c.targetInformation[key]
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if !found {
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log.Printf("No connection found for %s, ignoring", key)
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c.wakeupForTesting()
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return
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}
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delete(c.targetInformation, key)
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client, found := c.clientsMap[info.Address]
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if !found {
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return
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}
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log.Printf("Removing connection to %s (from %s)", info.Address, key)
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if err := client.Close(); err != nil {
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log.Printf("Error closing client to %s: %s", client.Target(), err)
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}
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delete(c.clientsMap, info.Address)
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c.clients = make([]*GrpcClient, 0, len(c.clientsMap))
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for _, client := range c.clientsMap {
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c.clients = append(c.clients, client)
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}
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statsGrpcClients.Dec()
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c.wakeupForTesting()
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}
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func (c *GrpcClients) WaitForInitialized(ctx context.Context) error {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-c.initializedCtx.Done():
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return nil
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}
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}
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func (c *GrpcClients) wakeupForTesting() {
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if c.wakeupChanForTesting == nil {
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return
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}
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select {
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case c.wakeupChanForTesting <- true:
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default:
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}
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}
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func (c *GrpcClients) Reload(config *goconf.ConfigFile) {
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if err := c.load(config); err != nil {
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log.Printf("Could not reload RPC clients: %s", err)
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}
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}
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func (c *GrpcClients) Close() {
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c.mu.Lock()
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defer c.mu.Unlock()
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for target, client := range c.clientsMap {
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if err := client.Close(); err != nil {
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log.Printf("Error closing client to %s: %s", target, err)
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}
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}
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c.clients = nil
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c.clientsMap = nil
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if c.etcdClient != nil {
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c.etcdClient.RemoveListener(c)
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}
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}
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func (c *GrpcClients) GetClients() []*GrpcClient {
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c.mu.RLock()
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defer c.mu.RUnlock()
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return c.clients
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}
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