frostfs-node/pkg/services/util/response/server_stream.go

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package response
import (
"context"
"github.com/nspcc-dev/neofs-node/pkg/services/util"
"github.com/pkg/errors"
)
// ServerMessageStreamer represents server-side message streamer
// that sets meta values to all response messages.
type ServerMessageStreamer struct {
cfg *cfg
recv util.ResponseMessageReader
}
// Recv calls Recv method of internal streamer, sets response meta
// values and returns the response.
func (s *ServerMessageStreamer) Recv() (util.ResponseMessage, error) {
m, err := s.recv()
if err != nil {
return nil, errors.Wrap(err, "could not receive response message for signing")
}
setMeta(m, s.cfg)
return m, nil
}
// HandleServerStreamRequest builds internal streamer via handlers, wraps it to ServerMessageStreamer and returns the result.
func (s *Service) HandleServerStreamRequest(ctx context.Context, req interface{}, handler util.ServerStreamHandler) (*ServerMessageStreamer, error) {
msgRdr, err := handler(ctx, req)
if err != nil {
return nil, errors.Wrap(err, "could not create message reader")
}
return &ServerMessageStreamer{
cfg: s.cfg,
recv: msgRdr,
}, nil
}
func (s *Service) HandleServerStreamRequest_(respWriter util.ResponseMessageWriter) util.ResponseMessageWriter {
return func(resp util.ResponseMessage) error {
setMeta(resp, s.cfg)
return respWriter(resp)
}
}