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/*
Copyright The containerd Authors.
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 streaming
import (
"errors"
"io"
api "github.com/containerd/containerd/api/services/streaming/v1"
"github.com/containerd/errdefs/pkg/errgrpc"
"github.com/containerd/log"
"github.com/containerd/plugin"
"github.com/containerd/plugin/registry"
"github.com/containerd/typeurl/v2"
"google.golang.org/grpc"
"github.com/containerd/containerd/v2/core/streaming"
ptypes "github.com/containerd/containerd/v2/pkg/protobuf/types"
"github.com/containerd/containerd/v2/plugins"
)
var emptyResponse typeurl.Any
func init() {
// save marshalled empty response to avoid marshaling everytime
var err error
emptyResponse, err = typeurl.MarshalAny(&ptypes.Empty{})
if err != nil {
panic(err)
}
registry.Register(&plugin.Registration{
Type: plugins.GRPCPlugin,
ID: "streaming",
Requires: []plugin.Type{
plugins.StreamingPlugin,
},
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
i, err := ic.GetByID(plugins.StreamingPlugin, "manager")
if err != nil {
return nil, err
}
return &service{manager: i.(streaming.StreamManager)}, nil
},
})
}
type service struct {
manager streaming.StreamManager
api.UnimplementedStreamingServer
}
func (s *service) Register(server *grpc.Server) error {
api.RegisterStreamingServer(server, s)
return nil
}
func (s *service) Stream(srv api.Streaming_StreamServer) error {
// TODO: Timeout waiting
a, err := srv.Recv()
if err != nil {
return err
}
var i api.StreamInit
if err := typeurl.UnmarshalTo(a, &i); err != nil {
return err
}
cc := make(chan struct{})
ss := &serviceStream{
s: srv,
cc: cc,
}
log.G(srv.Context()).WithField("stream", i.ID).Debug("registering stream")
if err := s.manager.Register(srv.Context(), i.ID, ss); err != nil {
return err
}
// Send response packet after registering stream
if err := srv.Send(typeurl.MarshalProto(emptyResponse)); err != nil {
return err
}
select {
case <-srv.Context().Done():
// TODO: Should return error if not cancelled?
case <-cc:
}
return nil
}
type serviceStream struct {
s api.Streaming_StreamServer
cc chan struct{}
}
func (ss *serviceStream) Send(a typeurl.Any) (err error) {
err = errgrpc.ToNative(ss.s.Send(typeurl.MarshalProto(a)))
if !errors.Is(err, io.EOF) {
err = errgrpc.ToNative(err)
}
return
}
func (ss *serviceStream) Recv() (a typeurl.Any, err error) {
a, err = ss.s.Recv()
if !errors.Is(err, io.EOF) {
err = errgrpc.ToNative(err)
}
return
}
func (ss *serviceStream) Close() error {
select {
case <-ss.cc:
default:
close(ss.cc)
}
return nil
}
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