dcf5687cab
Adds a service capable of streaming Any objects bi-directionally. This can be used by services to send data, received data, or to initiate requests from server to client. Signed-off-by: Derek McGowan <derek@mcg.dev>
124 lines
2.8 KiB
Go
124 lines
2.8 KiB
Go
/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package streaming
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import (
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"io"
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api "github.com/containerd/containerd/api/services/streaming/v1"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/pkg/streaming"
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"github.com/containerd/containerd/plugin"
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"github.com/containerd/containerd/protobuf"
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ptypes "github.com/containerd/containerd/protobuf/types"
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"github.com/containerd/typeurl"
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"google.golang.org/grpc"
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)
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func init() {
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plugin.Register(&plugin.Registration{
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Type: plugin.GRPCPlugin,
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ID: "streaming",
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Requires: []plugin.Type{
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plugin.StreamingPlugin,
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},
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InitFn: func(ic *plugin.InitContext) (interface{}, error) {
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i, err := ic.GetByID(plugin.StreamingPlugin, "manager")
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if err != nil {
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return nil, err
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}
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return &service{manager: i.(streaming.StreamManager)}, nil
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},
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})
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}
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type service struct {
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manager streaming.StreamManager
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api.UnimplementedStreamingServer
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}
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func (s *service) Register(server *grpc.Server) error {
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api.RegisterStreamingServer(server, s)
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return nil
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}
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func (s *service) Stream(srv api.Streaming_StreamServer) error {
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// TODO: Timeout waiting
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a, err := srv.Recv()
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if err != nil {
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return err
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}
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var i api.StreamInit
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if err := typeurl.UnmarshalTo(a, &i); err != nil {
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return err
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}
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// TODO: Save this response to avoid marshaling everytime
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response, err := typeurl.MarshalAny(&ptypes.Empty{})
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if err != nil {
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return err
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}
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if err := srv.Send(protobuf.FromAny(response)); err != nil {
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return err
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}
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cc := make(chan struct{})
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ss := &serviceStream{
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s: srv,
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cc: cc,
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}
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log.G(srv.Context()).WithField("stream", i.ID).Debug("registering stream")
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if err := s.manager.Register(srv.Context(), i.ID, ss); err != nil {
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return err
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}
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select {
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case <-srv.Context().Done():
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// TODO: Should return error if not cancelled?
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case <-cc:
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}
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return nil
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}
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type serviceStream struct {
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s api.Streaming_StreamServer
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cc chan struct{}
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}
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func (ss *serviceStream) Send(a typeurl.Any) error {
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return errdefs.FromGRPC(ss.s.Send(protobuf.FromAny(a)))
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}
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func (ss *serviceStream) Recv() (a typeurl.Any, err error) {
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a, err = ss.s.Recv()
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if err != io.EOF {
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err = errdefs.FromGRPC(err)
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}
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return
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}
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func (ss *serviceStream) Close() error {
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select {
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case <-ss.cc:
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default:
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close(ss.cc)
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}
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return nil
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}
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