141 lines
3.8 KiB
Go
141 lines
3.8 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package signalling
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import (
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"fmt"
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"github.com/livekit/protocol/livekit"
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"github.com/livekit/protocol/logger"
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"github.com/livekit/protocol/utils"
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"github.com/livekit/psrpc"
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"github.com/livekit/livekit-server/pkg/routing"
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"github.com/livekit/livekit-server/pkg/rtc/types"
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"google.golang.org/protobuf/proto"
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)
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var _ ParticipantSignaller = (*signallerAsync)(nil)
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type SignallerAsyncParams struct {
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Logger logger.Logger
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Participant types.LocalParticipant
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OnHandshakeOpened func()
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}
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type signallerAsync struct {
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params SignallerAsyncParams
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*signallerAsyncBase
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}
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func NewSignallerAsync(params SignallerAsyncParams) ParticipantSignaller {
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return &signallerAsync{
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params: params,
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signallerAsyncBase: newSignallerAsyncBase(signallerAsyncBaseParams{
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Logger: params.Logger,
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OnHandshakeOpened: params.OnHandshakeOpened,
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}),
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}
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}
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func (s *signallerAsync) WriteMessage(msg proto.Message) error {
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if msg == nil {
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return nil
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}
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getMessageType := func(msg proto.Message) string {
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messageType := "unknown"
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if typed, ok := msg.(*livekit.SignalResponse); ok {
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messageType = fmt.Sprintf("%T", typed.Message)
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}
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return messageType
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}
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if s.params.Participant.IsDisconnected() {
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s.params.Logger.Debugw(
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"could not send message to participant, participant disconnected",
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"messageType", getMessageType(msg),
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)
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return nil
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}
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// a signal connection opens with a join response, or with a reconnect response when
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// it is resumed or migrated in. The client reads that first message as the handshake,
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// so nothing may go out ahead of it.
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isHandshake := false
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isSdp := false
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if typed, ok := msg.(*livekit.SignalResponse); !ok {
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s.params.Logger.Warnw(
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"unknown message type", nil,
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"messageType", fmt.Sprintf("%T", msg),
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)
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} else {
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isHandshake = typed.GetJoin() != nil || typed.GetReconnect() != nil
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isSdp = typed.GetOffer() != nil || typed.GetAnswer() != nil
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}
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if !isHandshake && (!s.params.Participant.IsReady() || s.HandshakePending()) {
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logFunc := s.params.Logger.Debugw
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if isSdp {
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// a dropped SDP leaves the negotiation waiting for the peer until the
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// negotiation state machine recovers it, so make it visible
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logFunc = func(msg string, keysAndValues ...any) {
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s.params.Logger.Infow(msg, keysAndValues...)
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}
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}
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logFunc(
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"dropping message, connection has not opened yet",
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"messageType", getMessageType(msg),
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)
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return nil
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}
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sink := s.GetResponseSink()
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if sink == nil {
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s.params.Logger.Debugw(
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"could not send message to participant, no sink",
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"messageType", getMessageType(msg),
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)
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return nil
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}
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err := sink.WriteMessage(msg)
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if err != nil {
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if utils.ErrorIsOneOf(err, psrpc.Canceled, routing.ErrChannelClosed) {
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s.params.Logger.Debugw(
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"could not send message to participant",
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"error", err,
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"messageType", getMessageType(msg),
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)
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return nil
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} else {
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s.params.Logger.Warnw(
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"could not send message to participant", err,
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"messageType", getMessageType(msg),
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)
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return err
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}
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} else {
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if isHandshake {
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// the connection is open, hold nothing back any more
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s.OpenHandshake()
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}
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s.params.Logger.Debugw("sent signal response", "response", logger.Proto(msg))
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}
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return nil
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}
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