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package yarpc
import (
"context"
"encoding/binary"
"errors"
"io"
"github.com/influxdata/yamux"
"github.com/influxdata/yarpc/codes"
"github.com/influxdata/yarpc/status"
)
type StreamHandler func(srv interface{}, stream ServerStream) error
type StreamDesc struct {
Index uint8
StreamName string
Handler StreamHandler
ServerStreams bool
ClientStreams bool
}
// Stream defines the common interface a client or server stream has to satisfy.
type Stream interface {
// Context returns the context for this stream.
Context() context.Context
// SendMsg blocks until it sends m, the stream is done or the stream
// breaks.
// On error, it aborts the stream and returns an RPC status on client
// side. On server side, it simply returns the error to the caller.
// SendMsg is called by generated code. Also Users can call SendMsg
// directly when it is really needed in their use cases.
// It's safe to have a goroutine calling SendMsg and another goroutine calling
// recvMsg on the same stream at the same time.
// But it is not safe to call SendMsg on the same stream in different goroutines.
SendMsg(m interface{}) error
// RecvMsg blocks until it receives a message or the stream is
// done. On client side, it returns io.EOF when the stream is done. On
// any other error, it aborts the stream and returns an RPC status. On
// server side, it simply returns the error to the caller.
// It's safe to have a goroutine calling SendMsg and another goroutine calling
// recvMsg on the same stream at the same time.
// But it is not safe to call RecvMsg on the same stream in different goroutines.
RecvMsg(m interface{}) error
}
// ClientStream defines the interface a client stream has to satisfy.
type ClientStream interface {
// CloseSend closes the send direction of the stream. It closes the stream
// when non-nil error is met.
CloseSend() error
Stream
}
func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, api uint16) (ClientStream, error) {
cn, err := cc.NewStream()
if err != nil {
return nil, err
}
var tmp [2]byte
binary.BigEndian.PutUint16(tmp[:], api)
_, err = cn.Write(tmp[:])
if err != nil {
return nil, err
}
cs := &clientStream{
cn: cn,
codec: cc.dopts.codec,
p: &parser{r: cn},
desc: desc,
ctx: ctx,
closing: make(chan struct{}),
}
go func() {
select {
case <-ctx.Done():
cs.CloseSend()
case <-cs.closing:
}
}()
return cs, nil
}
type clientStream struct {
cn *yamux.Stream
codec Codec
p *parser
desc *StreamDesc
ctx context.Context
closing chan struct{}
}
func (c *clientStream) CloseSend() error {
select {
case <-c.closing:
default:
close(c.closing)
}
return c.cn.Close()
}
func (c *clientStream) Context() context.Context {
return c.ctx
}
func (c *clientStream) SendMsg(m interface{}) error {
select {
case <-c.closing:
return errors.New("stream closed")
default:
}
out, err := encode(c.codec, m)
if err != nil {
return err
}
_, err = c.cn.Write(out)
return err
}
func (c *clientStream) RecvMsg(m interface{}) error {
select {
case <-c.closing:
return errors.New("stream closed")
default:
}
err := decode(c.p, c.codec, c.cn, m)
if err == nil {
if !c.desc.ClientStreams || c.desc.ServerStreams {
return nil
}
}
return err
}
type ServerStream interface {
Stream
}
type serverStream struct {
cn *yamux.Stream
codec Codec
p *parser
buf []byte
}
func (s *serverStream) Context() context.Context {
panic("implement me")
}
func (s *serverStream) SendMsg(m interface{}) error {
out, err := encode(s.codec, m)
if err != nil {
return err
}
_, err = s.cn.Write(out)
if err != nil {
// TODO(sgc): wrap in status error
return err
}
return nil
}
func (s *serverStream) RecvMsg(m interface{}) error {
if err := decode(s.p, s.codec, s.cn, m); err != nil {
if err == io.EOF {
return err
}
if err == io.ErrUnexpectedEOF {
err = status.Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
}
// TODO(sgc): wrap in status error
return err
}
return nil
}
|
