/
stream.go
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/
stream.go
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// Copyright (c) 2022 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package transport
import (
"context"
"io"
"go.uber.org/yarpc/yarpcerrors"
)
// StreamRequest represents a streaming request. It contains basic stream
// metadata.
type StreamRequest struct {
Meta *RequestMeta
}
// ServerStreamOption are options to configure a ServerStream.
// There are no current ServerStreamOptions implemented.
type ServerStreamOption interface {
unimplemented()
}
// NewServerStream will create a new ServerStream.
// The Stream can implement StreamHeadersSender if the underlying transport
// supports stream headers.
func NewServerStream(s Stream, options ...ServerStreamOption) (*ServerStream, error) {
if s == nil {
return nil, yarpcerrors.InvalidArgumentErrorf("non-nil stream is required")
}
return &ServerStream{stream: s}, nil
}
// ServerStream represents the Server API of interacting with a Stream.
type ServerStream struct {
stream Stream
}
// StreamHeadersSender is the interface for sending stream headers.
type StreamHeadersSender interface {
SendHeaders(headers Headers) error
}
// SendStreamHeaders conditionally type asserts a Stream to a StreamHeadersSender to send the provided headers.
func SendStreamHeaders(s Stream, headers Headers) error {
if w, ok := s.(StreamHeadersSender); ok {
return w.SendHeaders(headers)
}
return yarpcerrors.UnimplementedErrorf("stream does not support sending headers")
}
// Context returns the context for the stream.
func (s *ServerStream) Context() context.Context {
return s.stream.Context()
}
// Request contains all the metadata about the request.
func (s *ServerStream) Request() *StreamRequest {
return s.stream.Request()
}
// SendMessage sends a request over the stream. It blocks until the message
// has been sent. In certain implementations, the timeout on the context
// will be used to timeout the request.
func (s *ServerStream) SendMessage(ctx context.Context, msg *StreamMessage) error {
return s.stream.SendMessage(ctx, msg)
}
// ReceiveMessage blocks until a message is received from the connection. It
// returns an io.Reader with the contents of the message.
func (s *ServerStream) ReceiveMessage(ctx context.Context) (*StreamMessage, error) {
return s.stream.ReceiveMessage(ctx)
}
// SendHeaders sends the one-time response headers to an initial stream connect.
// It fails if called multiple times.
func (s *ServerStream) SendHeaders(headers Headers) error {
return SendStreamHeaders(s.stream, headers)
}
// ClientStreamOption is an option for configuring a client stream.
// There are no current ClientStreamOptions implemented.
type ClientStreamOption interface {
unimplemented()
}
// NewClientStream will create a new ClientStream.
// The StreamCloser can implement StreamMessageReader if the underlying stream
// supports stream headers.
func NewClientStream(s StreamCloser, options ...ClientStreamOption) (*ClientStream, error) {
if s == nil {
return nil, yarpcerrors.InvalidArgumentErrorf("non-nil stream with close is required")
}
return &ClientStream{stream: s}, nil
}
// ClientStream represents the Client API of interacting with a Stream.
type ClientStream struct {
stream StreamCloser
}
// StreamHeadersReader is the interface for reading stream headers.
type StreamHeadersReader interface {
Headers() (Headers, error)
}
// ReadStreamHeaders conditionally type asserts a Stream to a StreamHeadersReader to read the received headers.
func ReadStreamHeaders(s Stream) (Headers, error) {
if r, ok := s.(StreamHeadersReader); ok {
return r.Headers()
}
return NewHeaders(), yarpcerrors.UnimplementedErrorf("stream does not support reading headers")
}
// Context returns the context for the stream.
func (s *ClientStream) Context() context.Context {
return s.stream.Context()
}
// Request contains all the metadata about the request.
func (s *ClientStream) Request() *StreamRequest {
return s.stream.Request()
}
// SendMessage sends a request over the stream. It blocks until the message
// has been sent. In certain implementations, the timeout on the context
// will be used to timeout the request.
func (s *ClientStream) SendMessage(ctx context.Context, msg *StreamMessage) error {
return s.stream.SendMessage(ctx, msg)
}
// ReceiveMessage blocks until a message is received from the connection. It
// returns an io.Reader with the contents of the message.
func (s *ClientStream) ReceiveMessage(ctx context.Context) (*StreamMessage, error) {
return s.stream.ReceiveMessage(ctx)
}
// Close will close the connection. It blocks until the server has
// acknowledged the close. In certain implementations, the timeout on the
// context will be used to timeout the request. If the server timed out the
// connection will be forced closed by the client.
func (s *ClientStream) Close(ctx context.Context) error {
return s.stream.Close(ctx)
}
// Headers returns the initial stream response headers received from the server if there
// are any. It blocks if the headers are not available.
func (s *ClientStream) Headers() (Headers, error) {
return ReadStreamHeaders(s.stream)
}
// StreamCloser represents an API of interacting with a Stream that is
// closable.
type StreamCloser interface {
Stream
// Close will close the connection. It blocks until the server has
// acknowledged the close. The provided context controls the timeout for
// this operation if the implementation supports it. If the server timed out
// the connection will be forced closed by the client.
Close(context.Context) error
}
// Stream is an interface for interacting with a stream.
type Stream interface {
// Context returns the context for the stream.
Context() context.Context
// Request contains all the metadata about the request.
Request() *StreamRequest
// SendMessage sends a request over the stream. It blocks until the message
// has been sent. In certain implementations, the timeout on the context
// will be used to timeout the request.
SendMessage(context.Context, *StreamMessage) error
// ReceiveMessage blocks until a message is received from the connection. It
// returns an io.Reader with the contents of the message.
ReceiveMessage(context.Context) (*StreamMessage, error)
}
// StreamMessage represents information that can be read off of an individual
// message in the stream.
type StreamMessage struct {
Body io.ReadCloser
BodySize int
}