mirror of
https://github.com/livekit/livekit.git
synced 2026-10-23 15:12:43 +00:00
Nicolas Buszczak
3a7228fa74
LoadIngress reads the ingress info and its state from two separate Redis keys non-atomically, while DeleteIngress removes both keys in a single transaction. If the delete lands between the two reads, LoadIngress returns an IngressInfo with a nil State and no error, and UpdateIngressState panics dereferencing info.State.Status — taking down the whole server with every room it hosts. The race fires in practice when an ingress session is being torn down by DeleteIngress and the ingress service reports the session state change concurrently: with short-lived per-room WHIP ingresses this crashed production servers within minutes (observed on v1.13.5 and v1.13.6, SIGSEGV at ioservice_ingress.go:82, addr=0x8). Guard the nil State by treating it as an empty state, matching how the store's UpdateIngressState already tolerates a missing state key.
125 lines
3.7 KiB
Go
125 lines
3.7 KiB
Go
// Copyright 2024 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 service
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import (
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"context"
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"errors"
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"google.golang.org/protobuf/types/known/emptypb"
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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/rpc"
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)
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func (s *IOInfoService) CreateIngress(ctx context.Context, info *livekit.IngressInfo) (*rpc.CreateIngressResponse, error) {
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if s.is == nil {
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return nil, ErrIngressNotConnected
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}
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err := s.is.StoreIngress(ctx, info)
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if err != nil {
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return nil, err
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}
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s.telemetry.IngressCreated(ctx, info)
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return &rpc.CreateIngressResponse{Info: info}, nil
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}
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func (s *IOInfoService) GetIngressInfo(ctx context.Context, req *rpc.GetIngressInfoRequest) (*rpc.GetIngressInfoResponse, error) {
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info, err := s.loadIngressFromInfoRequest(req)
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if err != nil {
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return nil, err
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}
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return &rpc.GetIngressInfoResponse{Info: info}, nil
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}
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func (s *IOInfoService) loadIngressFromInfoRequest(req *rpc.GetIngressInfoRequest) (info *livekit.IngressInfo, err error) {
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if s.is == nil {
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return nil, ErrIngressNotConnected
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}
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if req.IngressId != "" {
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info, err = s.is.LoadIngress(context.Background(), req.IngressId)
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} else if req.StreamKey != "" {
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info, err = s.is.LoadIngressFromStreamKey(context.Background(), req.StreamKey)
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} else {
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err = errors.New("request needs to specify either IngressId or StreamKey")
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}
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return info, err
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}
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func (s *IOInfoService) UpdateIngressState(ctx context.Context, req *rpc.UpdateIngressStateRequest) (*emptypb.Empty, error) {
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if s.is == nil {
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return nil, ErrIngressNotConnected
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}
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info, err := s.is.LoadIngress(ctx, req.IngressId)
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if err != nil {
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return nil, err
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}
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if info.State == nil {
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// LoadIngress reads the ingress info and its state non-atomically: a concurrent
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// DeleteIngress can remove the state key between the two reads, in which case
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// LoadIngress returns the info with a nil State and no error. Treat it as an
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// empty state instead of panicking on the status comparison below.
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info.State = &livekit.IngressState{}
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}
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if err = s.is.UpdateIngressState(ctx, req.IngressId, req.State); err != nil {
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logger.Errorw("could not update ingress", err)
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return nil, err
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}
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if info.State.Status != req.State.Status {
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info.State = req.State
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switch req.State.Status {
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case livekit.IngressState_ENDPOINT_ERROR,
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livekit.IngressState_ENDPOINT_INACTIVE,
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livekit.IngressState_ENDPOINT_COMPLETE:
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s.telemetry.IngressEnded(ctx, info)
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if req.State.Error != "" {
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logger.Infow("ingress failed", "error", req.State.Error, "ingressID", req.IngressId)
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} else {
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logger.Infow("ingress ended", "ingressID", req.IngressId)
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}
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case livekit.IngressState_ENDPOINT_PUBLISHING:
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s.telemetry.IngressStarted(ctx, info)
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logger.Infow("ingress started", "ingressID", req.IngressId)
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case livekit.IngressState_ENDPOINT_BUFFERING:
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s.telemetry.IngressUpdated(ctx, info)
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logger.Infow("ingress buffering", "ingressID", req.IngressId)
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}
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} else {
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// Status didn't change, send Updated event
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info.State = req.State
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s.telemetry.IngressUpdated(ctx, info)
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logger.Infow("ingress state updated", "ingressID", req.IngressId, "status", info.State.Status)
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}
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return &emptypb.Empty{}, nil
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}
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