forked from TrueCloudLab/frostfs-node
[#83] services/util: Implement response service
Create response package. Implement response Service that sets values of response meta header. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
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4 changed files with 166 additions and 0 deletions
45
pkg/services/util/response/client_stream.go
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45
pkg/services/util/response/client_stream.go
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package response
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import (
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"github.com/nspcc-dev/neofs-node/pkg/services/util"
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"github.com/pkg/errors"
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)
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// ClientMessageStreamer represents client-side message streamer
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// that sets meta values to the response.
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type ClientMessageStreamer struct {
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cfg *cfg
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send util.RequestMessageWriter
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close util.ClientStreamCloser
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}
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// Recv calls send method of internal streamer.
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func (s *ClientMessageStreamer) Send(req interface{}) error {
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return errors.Wrapf(
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s.send(req),
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"(%T) could not send the request", s)
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}
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// CloseAndRecv closes internal stream, receivers the response,
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// sets meta values and returns the result.
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func (s *ClientMessageStreamer) CloseAndRecv() (util.ResponseMessage, error) {
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resp, err := s.close()
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if err != nil {
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return nil, errors.Wrapf(err, "(%T) could not close stream and receive response", s)
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}
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setMeta(resp, s.cfg)
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return resp, nil
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}
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// CreateRequestStreamer wraps stream methods and returns ClientMessageStreamer instance.
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func (s *Service) CreateRequestStreamer(sender util.RequestMessageWriter, closer util.ClientStreamCloser) *ClientMessageStreamer {
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return &ClientMessageStreamer{
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cfg: s.cfg,
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send: sender,
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close: closer,
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}
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}
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42
pkg/services/util/response/server_stream.go
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42
pkg/services/util/response/server_stream.go
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package response
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import (
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"context"
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"github.com/nspcc-dev/neofs-node/pkg/services/util"
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"github.com/pkg/errors"
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)
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// ServerMessageStreamer represents server-side message streamer
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// that sets meta values to all response messages.
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type ServerMessageStreamer struct {
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cfg *cfg
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recv util.ResponseMessageReader
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}
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// Recv calls Recv method of internal streamer, sets response meta
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// values and returns the response.
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func (s *ServerMessageStreamer) Recv() (util.ResponseMessage, error) {
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m, err := s.recv()
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if err != nil {
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return nil, errors.Wrap(err, "could not receive response message for signing")
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}
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setMeta(m, s.cfg)
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return m, nil
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}
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// HandleServerStreamRequest builds internal streamer via handlers, wraps it to ServerMessageStreamer and returns the result.
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func (s *Service) HandleServerStreamRequest(ctx context.Context, req interface{}, handler util.ServerStreamHandler) (*ServerMessageStreamer, error) {
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msgRdr, err := handler(ctx, req)
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if err != nil {
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return nil, errors.Wrap(err, "could not create message reader")
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}
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return &ServerMessageStreamer{
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cfg: s.cfg,
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recv: msgRdr,
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}, nil
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}
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58
pkg/services/util/response/service.go
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58
pkg/services/util/response/service.go
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package response
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import (
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"github.com/nspcc-dev/neofs-api-go/pkg"
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"github.com/nspcc-dev/neofs-api-go/v2/refs"
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"github.com/nspcc-dev/neofs-api-go/v2/session"
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"github.com/nspcc-dev/neofs-node/pkg/services/util"
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)
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// Service represents universal v2 service
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// that sets response meta header values.
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type Service struct {
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cfg *cfg
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}
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// Option is an option of Service constructor.
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type Option func(*cfg)
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type cfg struct {
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version *refs.Version
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// TODO: neofs-node#83 add network state
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}
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func defaultCfg() *cfg {
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return &cfg{
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version: pkg.SDKVersion().ToV2(),
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}
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}
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// NewService creates, initializes and returns Service instance.
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func NewService(opts ...Option) *Service {
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c := defaultCfg()
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for i := range opts {
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opts[i](c)
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}
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return &Service{
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cfg: c,
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}
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}
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func setMeta(resp util.ResponseMessage, cfg *cfg) {
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meta := new(session.ResponseMetaHeader)
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meta.SetVersion(cfg.version)
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meta.SetTTL(1) // FIXME: TTL must be calculated
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// TODO: neofs-node#83
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// meta.SetEpoch()
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if origin := resp.GetMetaHeader(); origin != nil {
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// FIXME: what if origin is set by local server?
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meta.SetOrigin(origin)
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}
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resp.SetMetaHeader(meta)
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}
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21
pkg/services/util/response/unary.go
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21
pkg/services/util/response/unary.go
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package response
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import (
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"context"
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"github.com/nspcc-dev/neofs-node/pkg/services/util"
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"github.com/pkg/errors"
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)
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// HandleUnaryRequest call passes request to handler, sets response meta header values and returns it.
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func (s *Service) HandleUnaryRequest(ctx context.Context, req interface{}, handler util.UnaryHandler) (util.ResponseMessage, error) {
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// process request
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resp, err := handler(ctx, req)
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if err != nil {
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return nil, errors.Wrap(err, "could not handle request")
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}
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setMeta(resp, s.cfg)
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return resp, nil
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}
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