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Code Issues Releases Activity

Merge pull request #29 from micro/stream

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Stream
This commit is contained in:
Asim 2015-12-19 17:48:02 +00:00
commit 539b3d045c
19 changed files with 654 additions and 227 deletions
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36
client/client.go
View File

@ -27,13 +27,13 @@ import (
type Client interface {
NewPublication(topic string, msg interface{}) Publication
NewRequest(service, method string, req interface{}) Request
NewProtoRequest(service, method string, req interface{}) Request
NewJsonRequest(service, method string, req interface{}) Request
NewRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
NewProtoRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
NewJsonRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
CallRemote(ctx context.Context, addr string, req Request, rsp interface{}, opts ...CallOption) error
Stream(ctx context.Context, req Request, rspChan interface{}, opts ...CallOption) (Streamer, error)
StreamRemote(ctx context.Context, addr string, req Request, rspChan interface{}, opts ...CallOption) (Streamer, error)
Stream(ctx context.Context, req Request, opts ...CallOption) (Streamer, error)
StreamRemote(ctx context.Context, addr string, req Request, opts ...CallOption) (Streamer, error)
Publish(ctx context.Context, p Publication, opts ...PublishOption) error
}
@ -48,10 +48,15 @@ type Request interface {
Method() string
ContentType() string
Request() interface{}
// indicates whether the request will be a streaming one rather than unary
Stream() bool
}
type Streamer interface {
Context() context.Context
Request() Request
Send(interface{}) error
Recv(interface{}) error
Error() error
Close() error
}
@ -59,6 +64,7 @@ type Streamer interface {
type Option func(*options)
type CallOption func(*callOptions)
type PublishOption func(*publishOptions)
type RequestOption func(*requestOptions)
var (
DefaultClient Client = newRpcClient()
@ -76,13 +82,13 @@ func CallRemote(ctx context.Context, address string, request Request, response i
// Creates a streaming connection with a service and returns responses on the
// channel passed in. It's upto the user to close the streamer.
func Stream(ctx context.Context, request Request, responseChan interface{}, opts ...CallOption) (Streamer, error) {
return DefaultClient.Stream(ctx, request, responseChan, opts...)
func Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
return DefaultClient.Stream(ctx, request, opts...)
}
// Creates a streaming connection to the address specified.
func StreamRemote(ctx context.Context, address string, request Request, responseChan interface{}, opts ...CallOption) (Streamer, error) {
return DefaultClient.StreamRemote(ctx, address, request, responseChan, opts...)
func StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
return DefaultClient.StreamRemote(ctx, address, request, opts...)
}
// Publishes a publication using the default client. Using the underlying broker
@ -103,16 +109,16 @@ func NewPublication(topic string, message interface{}) Publication {
// Creates a new request using the default client. Content Type will
// be set to the default within options and use the appropriate codec
func NewRequest(service, method string, request interface{}) Request {
return DefaultClient.NewRequest(service, method, request)
func NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewRequest(service, method, request, reqOpts...)
}
// Creates a new protobuf request using the default client
func NewProtoRequest(service, method string, request interface{}) Request {
return DefaultClient.NewProtoRequest(service, method, request)
func NewProtoRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewProtoRequest(service, method, request, reqOpts...)
}
// Creates a new json request using the default client
func NewJsonRequest(service, method string, request interface{}) Request {
return DefaultClient.NewJsonRequest(service, method, request)
func NewJsonRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewJsonRequest(service, method, request, reqOpts...)
}

3
client/client_wrapper.go
View File

@ -36,3 +36,6 @@ Example usage:
// Wrapper wraps a client and returns a client
type Wrapper func(Client) Client
// StreamWrapper wraps a Stream and returns the equivalent
type StreamWrapper func(Streamer) Streamer

12
client/options.go
View File

@ -24,6 +24,10 @@ type callOptions struct {
type publishOptions struct{}
type requestOptions struct {
stream bool
}
// Broker to be used for pub/sub
func Broker(b broker.Broker) Option {
return func(o *options) {
@ -80,3 +84,11 @@ func WithSelectOption(so selector.SelectOption) CallOption {
o.selectOptions = append(o.selectOptions, so)
}
}
// Request Options
func StreamingRequest() RequestOption {
return func(o *requestOptions) {
o.stream = true
}
}

40
client/rpc_client.go
View File

@ -112,7 +112,7 @@ func (r *rpcClient) call(ctx context.Context, address string, request Request, r
return client.Close()
}
func (r *rpcClient) stream(ctx context.Context, address string, request Request, responseChan interface{}) (Streamer, error) {
func (r *rpcClient) stream(ctx context.Context, address string, req Request) (Streamer, error) {
msg := &transport.Message{
Header: make(map[string]string),
}
@ -124,9 +124,9 @@ func (r *rpcClient) stream(ctx context.Context, address string, request Request,
}
}
msg.Header["Content-Type"] = request.ContentType()
msg.Header["Content-Type"] = req.ContentType()
cf, err := r.newCodec(request.ContentType())
cf, err := r.newCodec(req.ContentType())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
@ -136,14 +136,14 @@ func (r *rpcClient) stream(ctx context.Context, address string, request Request,
return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
}
client := newClientWithCodec(newRpcPlusCodec(msg, c, cf))
call := client.StreamGo(request.Service(), request.Method(), request.Request(), responseChan)
stream := &rpcStream{
context: ctx,
request: req,
codec: newRpcPlusCodec(msg, c, cf),
}
return &rpcStream{
request: request,
call: call,
client: client,
}, nil
err = stream.Send(req.Request())
return stream, err
}
func (r *rpcClient) CallRemote(ctx context.Context, address string, request Request, response interface{}, opts ...CallOption) error {
@ -180,11 +180,11 @@ func (r *rpcClient) Call(ctx context.Context, request Request, response interfac
return err
}
func (r *rpcClient) StreamRemote(ctx context.Context, address string, request Request, responseChan interface{}, opts ...CallOption) (Streamer, error) {
return r.stream(ctx, address, request, responseChan)
func (r *rpcClient) StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
return r.stream(ctx, address, request)
}
func (r *rpcClient) Stream(ctx context.Context, request Request, responseChan interface{}, opts ...CallOption) (Streamer, error) {
func (r *rpcClient) Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
var copts callOptions
for _, opt := range opts {
opt(&copts)
@ -209,7 +209,7 @@ func (r *rpcClient) Stream(ctx context.Context, request Request, responseChan in
address = fmt.Sprintf("%s:%d", address, node.Port)
}
stream, err := r.stream(ctx, address, request, responseChan)
stream, err := r.stream(ctx, address, request)
r.opts.selector.Mark(request.Service(), node, err)
return stream, err
}
@ -247,14 +247,14 @@ func (r *rpcClient) NewPublication(topic string, message interface{}) Publicatio
func (r *rpcClient) NewProtoPublication(topic string, message interface{}) Publication {
return newRpcPublication(topic, message, "application/octet-stream")
}
func (r *rpcClient) NewRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, r.opts.contentType)
func (r *rpcClient) NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return newRpcRequest(service, method, request, r.opts.contentType, reqOpts...)
}
func (r *rpcClient) NewProtoRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, "application/octet-stream")
func (r *rpcClient) NewProtoRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return newRpcRequest(service, method, request, "application/octet-stream", reqOpts...)
}
func (r *rpcClient) NewJsonRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, "application/json")
func (r *rpcClient) NewJsonRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return newRpcRequest(service, method, request, "application/json", reqOpts...)
}

1
client/rpc_codec.go
View File

@ -63,6 +63,7 @@ func newRpcPlusCodec(req *transport.Message, client transport.Client, c codec.Ne
}
func (c *rpcPlusCodec) WriteRequest(req *request, body interface{}) error {
c.buf.wbuf.Reset()
m := &codec.Message{
Id: req.Seq,
Target: req.Service,

14
client/rpc_request.go
View File

@ -5,14 +5,22 @@ type rpcRequest struct {
method string
contentType string
request interface{}
opts requestOptions
}
func newRpcRequest(service, method string, request interface{}, contentType string, reqOpts ...RequestOption) Request {
var opts requestOptions
for _, o := range reqOpts {
o(&opts)
}
func newRpcRequest(service, method string, request interface{}, contentType string) Request {
return &rpcRequest{
service: service,
method: method,
request: request,
contentType: contentType,
opts: opts,
}
}
@ -31,3 +39,7 @@ func (r *rpcRequest) Method() string {
func (r *rpcRequest) Request() interface{} {
return r.request
}
func (r *rpcRequest) Stream() bool {
return r.opts.stream
}

101
client/rpc_stream.go
View File

@ -1,19 +1,112 @@
package client
import (
"errors"
"io"
"log"
"sync"
"golang.org/x/net/context"
)
// Implements the streamer interface
type rpcStream struct {
sync.RWMutex
seq uint64
closed bool
err error
request Request
call *call
client *client
codec clientCodec
context context.Context
}
func (r *rpcStream) Context() context.Context {
return r.context
}
func (r *rpcStream) Request() Request {
return r.request
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.closed {
r.err = errShutdown
return errShutdown
}
seq := r.seq
r.seq++
req := request{
Service: r.request.Service(),
Seq: seq,
ServiceMethod: r.request.Method(),
}
if err := r.codec.WriteRequest(&req, msg); err != nil {
r.err = err
return err
}
return nil
}
func (r *rpcStream) Recv(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.closed {
r.err = errShutdown
return errShutdown
}
var resp response
if err := r.codec.ReadResponseHeader(&resp); err != nil {
if err == io.EOF && !r.closed {
r.err = io.ErrUnexpectedEOF
return io.ErrUnexpectedEOF
}
r.err = err
return err
}
switch {
case len(resp.Error) > 0:
// We've got an error response. Give this to the request;
// any subsequent requests will get the ReadResponseBody
// error if there is one.
if resp.Error != lastStreamResponseError {
r.err = serverError(resp.Error)
} else {
r.err = io.EOF
}
if err := r.codec.ReadResponseBody(nil); err != nil {
r.err = errors.New("reading error payload: " + err.Error())
}
default:
if err := r.codec.ReadResponseBody(msg); err != nil {
r.err = errors.New("reading body " + err.Error())
}
}
if r.err != nil && r.err != io.EOF && !r.closed {
log.Println("rpc: client protocol error:", r.err)
}
return r.err
}
func (r *rpcStream) Error() error {
return r.call.Error
r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
return r.client.Close()
r.Lock()
defer r.Unlock()
r.closed = true
return r.codec.Close()
}

46
client/rpcplus_client.go
View File

@ -8,7 +8,6 @@ import (
"errors"
"io"
"log"
"reflect"
"sync"
"github.com/youtube/vitess/go/trace"
@ -38,7 +37,6 @@ type call struct {
Reply interface{} // The reply from the function (*struct for single, chan * struct for streaming).
Error error // After completion, the error status.
Done chan *call // Strobes when call is complete (nil for streaming RPCs)
Stream bool // True for a streaming RPC call, false otherwise
Subseq uint64 // The next expected subseq in the packets
}
@ -145,28 +143,12 @@ func (client *client) input() {
// We've got an error response. Give this to the request;
// any subsequent requests will get the ReadResponseBody
// error if there is one.
if !(call.Stream && resp.Error == lastStreamResponseError) {
call.Error = serverError(resp.Error)
}
err = client.codec.ReadResponseBody(nil)
if err != nil {
err = errors.New("reading error payload: " + err.Error())
}
client.done(seq)
case call.Stream:
// call.Reply is a chan *T2
// we need to create a T2 and get a *T2 back
value := reflect.New(reflect.TypeOf(call.Reply).Elem().Elem()).Interface()
err = client.codec.ReadResponseBody(value)
if err != nil {
call.Error = errors.New("reading body " + err.Error())
} else {
// writing on the channel could block forever. For
// instance, if a client calls 'close', this might block
// forever. the current suggestion is for the
// client to drain the receiving channel in that case
reflect.ValueOf(call.Reply).Send(reflect.ValueOf(value))
}
default:
err = client.codec.ReadResponseBody(call.Reply)
if err != nil {
@ -203,12 +185,6 @@ func (client *client) done(seq uint64) {
}
func (call *call) done() {
if call.Stream {
// need to close the channel. client won't be able to read any more.
reflect.ValueOf(call.Reply).Close()
return
}
select {
case call.Done <- call:
// ok
@ -270,28 +246,6 @@ func (client *client) Go(ctx context.Context, service, serviceMethod string, arg
return cal
}
// StreamGo invokes the streaming function asynchronously. It returns the call structure representing
// the invocation.
func (client *client) StreamGo(service string, serviceMethod string, args interface{}, replyStream interface{}) *call {
// first check the replyStream object is a stream of pointers to a data structure
typ := reflect.TypeOf(replyStream)
// FIXME: check the direction of the channel, maybe?
if typ.Kind() != reflect.Chan || typ.Elem().Kind() != reflect.Ptr {
log.Panic("rpc: replyStream is not a channel of pointers")
return nil
}
call := new(call)
call.Service = service
call.ServiceMethod = serviceMethod
call.Args = args
call.Reply = replyStream
call.Stream = true
call.Subseq = 0
client.send(call)
return call
}
// call invokes the named function, waits for it to complete, and returns its error status.
func (client *client) Call(ctx context.Context, service string, serviceMethod string, args interface{}, reply interface{}) error {
call := <-client.Go(ctx, service, serviceMethod, args, reply, make(chan *call, 1)).Done

42
examples/client/codegen/codegen.go
View File

@ -21,14 +21,14 @@ func call(i int) {
fmt.Println("Call:", i, "rsp:", rsp.Msg)
}
func stream() {
stream, err := cl.Stream(context.Background(), &example.StreamingRequest{Count: int64(10)})
func stream(i int) {
stream, err := cl.Stream(context.Background(), &example.StreamingRequest{Count: int64(i)})
if err != nil {
fmt.Println("err:", err)
return
}
for i := 0; i < 10; i++ {
rsp, err := stream.Next()
for j := 0; j < i; j++ {
rsp, err := stream.RecvR()
if err != nil {
fmt.Println("err:", err)
break
@ -44,6 +44,34 @@ func stream() {
}
}
func pingPong(i int) {
stream, err := cl.PingPong(context.Background())
if err != nil {
fmt.Println("err:", err)
return
}
for j := 0; j < i; j++ {
if err := stream.SendR(&example.Ping{Stroke: int64(j)}); err != nil {
fmt.Println("err:", err)
return
}
rsp, err := stream.RecvR()
if err != nil {
fmt.Println("recv err", err)
break
}
fmt.Printf("Sent ping %v got pong %v\n", j, rsp.Stroke)
}
if stream.Error() != nil {
fmt.Println("stream err:", err)
return
}
if err := stream.Close(); err != nil {
fmt.Println("stream close err:", err)
}
}
func main() {
cmd.Init()
@ -51,6 +79,10 @@ func main() {
for i := 0; i < 10; i++ {
call(i)
}
fmt.Println("\n--- Streamer example ---\n")
stream()
stream(10)
fmt.Println("\n--- Ping Pong example ---\n")
pingPong(10)
}

62
examples/client/main.go
View File

@ -54,22 +54,63 @@ func call(i int) {
fmt.Println("Call:", i, "rsp:", rsp.Msg)
}
func stream() {
func stream(i int) {
// Create new request to service go.micro.srv.example, method Example.Call
req := client.NewRequest("go.micro.srv.example", "Example.Stream", &example.StreamingRequest{
Count: int64(10),
})
// Request can be empty as its actually ignored and merely used to call the handler
req := client.NewRequest("go.micro.srv.example", "Example.Stream", &example.StreamingRequest{})
rspChan := make(chan *example.StreamingResponse, 10)
stream, err := client.Stream(context.Background(), req)
if err != nil {
fmt.Println("err:", err)
return
}
if err := stream.Send(&example.StreamingRequest{Count: int64(i)}); err != nil {
fmt.Println("err:", err)
return
}
for stream.Error() == nil {
rsp := &example.StreamingResponse{}
err := stream.Recv(rsp)
if err != nil {
fmt.Println("recv err", err)
break
}
fmt.Println("Stream: rsp:", rsp.Count)
}
stream, err := client.Stream(context.Background(), req, rspChan)
if stream.Error() != nil {
fmt.Println("stream err:", err)
return
}
if err := stream.Close(); err != nil {
fmt.Println("stream close err:", err)
}
}
func pingPong(i int) {
// Create new request to service go.micro.srv.example, method Example.Call
// Request can be empty as its actually ignored and merely used to call the handler
req := client.NewRequest("go.micro.srv.example", "Example.PingPong", &example.StreamingRequest{})
stream, err := client.Stream(context.Background(), req)
if err != nil {
fmt.Println("err:", err)
return
}
for rsp := range rspChan {
fmt.Println("Stream: rsp:", rsp.Count)
for j := 0; j < i; j++ {
if err := stream.Send(&example.Ping{Stroke: int64(j + 1)}); err != nil {
fmt.Println("err:", err)
return
}
rsp := &example.Pong{}
err := stream.Recv(rsp)
if err != nil {
fmt.Println("recv err", err)
break
}
fmt.Printf("Sent ping %v got pong %v\n", j+1, rsp.Stroke)
}
if stream.Error() != nil {
@ -90,7 +131,10 @@ func main() {
}
fmt.Println("\n--- Streamer example ---\n")
stream()
stream(10)
fmt.Println("\n--- Ping Pong example ---\n")
pingPong(10)
fmt.Println("\n--- Publisher example ---\n")
pub()

32
examples/server/handler/example.go
View File

@ -18,19 +18,41 @@ func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.R
return nil
}
func (e *Example) Stream(ctx context.Context, req *example.StreamingRequest, response func(interface{}) error) error {
func (e *Example) Stream(ctx context.Context, stream server.Streamer) error {
log.Info("Executing streaming handler")
req := &example.StreamingRequest{}
// We just want to receive 1 request and then process here
if err := stream.Recv(req); err != nil {
log.Errorf("Error receiving streaming request: %v", err)
return err
}
log.Infof("Received Example.Stream request with count: %d", req.Count)
for i := 0; i < int(req.Count); i++ {
log.Infof("Responding: %d", i)
r := &example.StreamingResponse{
if err := stream.Send(&example.StreamingResponse{
Count: int64(i),
}
if err := response(r); err != nil {
}); err != nil {
return err
}
}
return nil
}
func (e *Example) PingPong(ctx context.Context, stream server.Streamer) error {
for {
req := &example.Ping{}
if err := stream.Recv(req); err != nil {
return err
}
log.Infof("Got ping %v", req.Stroke)
if err := stream.Send(&example.Pong{Stroke: req.Stroke}); err != nil {
return err
}
}
return nil
}

173
examples/server/proto/example/example.pb.go
View File

@ -14,6 +14,8 @@ It has these top-level messages:
Response
StreamingRequest
StreamingResponse
Ping
Pong
*/
package go_micro_srv_example
@ -77,12 +79,32 @@ func (m *StreamingResponse) String() string { return proto.CompactTex
func (*StreamingResponse) ProtoMessage() {}
func (*StreamingResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
type Ping struct {
Stroke int64 `protobuf:"varint,1,opt,name=stroke" json:"stroke,omitempty"`
}
func (m *Ping) Reset() { *m = Ping{} }
func (m *Ping) String() string { return proto.CompactTextString(m) }
func (*Ping) ProtoMessage() {}
func (*Ping) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
type Pong struct {
Stroke int64 `protobuf:"varint,1,opt,name=stroke" json:"stroke,omitempty"`
}
func (m *Pong) Reset() { *m = Pong{} }
func (m *Pong) String() string { return proto.CompactTextString(m) }
func (*Pong) ProtoMessage() {}
func (*Pong) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
func init() {
proto.RegisterType((*Message)(nil), "go.micro.srv.example.Message")
proto.RegisterType((*Request)(nil), "go.micro.srv.example.Request")
proto.RegisterType((*Response)(nil), "go.micro.srv.example.Response")
proto.RegisterType((*StreamingRequest)(nil), "go.micro.srv.example.StreamingRequest")
proto.RegisterType((*StreamingResponse)(nil), "go.micro.srv.example.StreamingResponse")
proto.RegisterType((*Ping)(nil), "go.micro.srv.example.Ping")
proto.RegisterType((*Pong)(nil), "go.micro.srv.example.Pong")
}
// Reference imports to suppress errors if they are not otherwise used.
@ -95,6 +117,7 @@ var _ server.Option
type ExampleClient interface {
Call(ctx context.Context, in *Request, opts ...client.CallOption) (*Response, error)
Stream(ctx context.Context, in *StreamingRequest, opts ...client.CallOption) (Example_StreamClient, error)
PingPong(ctx context.Context, opts ...client.CallOption) (Example_PingPongClient, error)
}
type exampleClient struct {
@ -126,59 +149,151 @@ func (c *exampleClient) Call(ctx context.Context, in *Request, opts ...client.Ca
}
func (c *exampleClient) Stream(ctx context.Context, in *StreamingRequest, opts ...client.CallOption) (Example_StreamClient, error) {
req := c.c.NewRequest(c.serviceName, "Example.Stream", in)
outCh := make(chan *StreamingResponse)
stream, err := c.c.Stream(ctx, req, outCh, opts...)
req := c.c.NewRequest(c.serviceName, "Example.Stream", &StreamingRequest{})
stream, err := c.c.Stream(ctx, req, opts...)
if err != nil {
return nil, err
}
return &exampleStreamClient{stream, outCh}, nil
if err := stream.Send(in); err != nil {
return nil, err
}
return &exampleStreamClient{stream}, nil
}
type Example_StreamClient interface {
Next() (*StreamingResponse, error)
RecvR() (*StreamingResponse, error)
client.Streamer
}
type exampleStreamClient struct {
client.Streamer
next chan *StreamingResponse
}
func (x *exampleStreamClient) Next() (*StreamingResponse, error) {
out, ok := <-x.next
if !ok {
return nil, fmt.Errorf(`chan closed`)
func (x *exampleStreamClient) RecvR() (*StreamingResponse, error) {
m := new(StreamingResponse)
err := x.Recv(m)
if err != nil {
return nil, err
}
return out, nil
return m, nil
}
func (c *exampleClient) PingPong(ctx context.Context, opts ...client.CallOption) (Example_PingPongClient, error) {
req := c.c.NewRequest(c.serviceName, "Example.PingPong", &Ping{})
stream, err := c.c.Stream(ctx, req, opts...)
if err != nil {
return nil, err
}
return &examplePingPongClient{stream}, nil
}
type Example_PingPongClient interface {
SendR(*Ping) error
RecvR() (*Pong, error)
client.Streamer
}
type examplePingPongClient struct {
client.Streamer
}
func (x *examplePingPongClient) SendR(m *Ping) error {
return x.Send(m)
}
func (x *examplePingPongClient) RecvR() (*Pong, error) {
m := new(Pong)
err := x.Recv(m)
if err != nil {
return nil, err
}
return m, nil
}
// Server API for Example service
type ExampleHandler interface {
Call(context.Context, *Request, *Response) error
Stream(context.Context, func(*StreamingResponse) error) error
Stream(context.Context, *StreamingRequest, Example_StreamStream) error
PingPong(context.Context, Example_PingPongStream) error
}
func RegisterExampleHandler(s server.Server, hdlr ExampleHandler) {
s.Handle(s.NewHandler(hdlr))
s.Handle(s.NewHandler(&exampleHandler{hdlr}))
}
type exampleHandler struct {
ExampleHandler
}
func (h *exampleHandler) Call(ctx context.Context, in *Request, out *Response) error {
return h.ExampleHandler.Call(ctx, in, out)
}
func (h *exampleHandler) Stream(ctx context.Context, stream server.Streamer) error {
m := new(StreamingRequest)
if err := stream.Recv(m); err != nil {
return err
}
return h.ExampleHandler.Stream(ctx, m, &exampleStreamStream{stream})
}
type Example_StreamStream interface {
SendR(*StreamingResponse) error
server.Streamer
}
type exampleStreamStream struct {
server.Streamer
}
func (x *exampleStreamStream) SendR(m *StreamingResponse) error {
return x.Streamer.Send(m)
}
func (h *exampleHandler) PingPong(ctx context.Context, stream server.Streamer) error {
return h.ExampleHandler.PingPong(ctx, &examplePingPongStream{stream})
}
type Example_PingPongStream interface {
SendR(*Pong) error
RecvR() (*Ping, error)
server.Streamer
}
type examplePingPongStream struct {
server.Streamer
}
func (x *examplePingPongStream) SendR(m *Pong) error {
return x.Streamer.Send(m)
}
func (x *examplePingPongStream) RecvR() (*Ping, error) {
m := new(Ping)
if err := x.Streamer.Recv(m); err != nil {
return nil, err
}
return m, nil
}
var fileDescriptor0 = []byte{
// 230 bytes of a gzipped FileDescriptorProto
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x84, 0x90, 0xcd, 0x4a, 0xc5, 0x30,
0x10, 0x85, 0x0d, 0xf7, 0x7a, 0xab, 0xa3, 0x82, 0x06, 0x51, 0x29, 0x28, 0x9a, 0x85, 0xba, 0x31,
0x15, 0xf5, 0x0d, 0x44, 0x5c, 0xb9, 0xa9, 0x6b, 0x17, 0xb1, 0x0c, 0xa1, 0xd0, 0x24, 0x35, 0x93,
0x16, 0x7d, 0x2c, 0xdf, 0x50, 0x48, 0xd3, 0xa2, 0x52, 0x71, 0x15, 0x98, 0xf3, 0x9d, 0x1f, 0x02,
0x77, 0xda, 0x5d, 0x99, 0xba, 0xf2, 0xae, 0xc0, 0x77, 0x65, 0xda, 0x06, 0xa9, 0x20, 0xf4, 0x3d,
0xfa, 0xa2, 0xf5, 0x2e, 0x4c, 0xd7, 0xf1, 0x95, 0xf1, 0xca, 0xf7, 0xb5, 0x93, 0xd1, 0x25, 0xc9,
0xf7, 0x32, 0x69, 0xe2, 0x00, 0xb2, 0x27, 0x24, 0x52, 0x1a, 0xf9, 0x16, 0x2c, 0x48, 0x7d, 0x1c,
0xb1, 0x53, 0x76, 0xb9, 0x29, 0x0e, 0x21, 0x2b, 0xf1, 0xad, 0x43, 0x0a, 0x7c, 0x1b, 0x96, 0x56,
0x19, 0x9c, 0x84, 0x8d, 0x12, 0xa9, 0x75, 0x96, 0xa2, 0xc3, 0x90, 0x4e, 0xc2, 0x19, 0xec, 0x3e,
0x07, 0x8f, 0xca, 0xd4, 0x56, 0x8f, 0xd6, 0x1d, 0x58, 0xaf, 0x5c, 0x67, 0x43, 0x44, 0x16, 0x42,
0xc0, 0xde, 0x37, 0x24, 0x85, 0xfc, 0x64, 0x6e, 0x3e, 0x19, 0x64, 0x0f, 0xc3, 0x38, 0xfe, 0x08,
0xcb, 0x7b, 0xd5, 0x34, 0xfc, 0x58, 0xce, 0x6d, 0x97, 0xa9, 0x25, 0x3f, 0xf9, 0x4b, 0x1e, 0x1a,
0xc4, 0x1a, 0x7f, 0x81, 0xd5, 0x50, 0xcc, 0xcf, 0xe7, 0xd9, 0xdf, 0xcb, 0xf3, 0x8b, 0x7f, 0xb9,
0x31, 0xfc, 0x9a, 0xbd, 0xae, 0xe2, 0x0f, 0xdf, 0x7e, 0x05, 0x00, 0x00, 0xff, 0xff, 0x63, 0x02,
0xbf, 0x5f, 0x99, 0x01, 0x00, 0x00,
// 270 bytes of a gzipped FileDescriptorProto
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x84, 0x91, 0x5f, 0x4b, 0xc3, 0x30,
0x14, 0xc5, 0x17, 0x56, 0xdb, 0x79, 0xfd, 0x83, 0x06, 0x99, 0x52, 0x50, 0x34, 0x0f, 0xba, 0x17,
0xd3, 0xa1, 0x7e, 0x03, 0x11, 0x7d, 0x11, 0x64, 0x3e, 0xfb, 0x10, 0xc7, 0x25, 0x0c, 0x9b, 0xa6,
0xe6, 0x66, 0x43, 0x3f, 0xbb, 0x2f, 0x6e, 0x69, 0x3b, 0xc6, 0xec, 0xf0, 0x29, 0x70, 0x7e, 0xe7,
0x5c, 0xce, 0x21, 0x70, 0xa7, 0xed, 0xb5, 0x99, 0x8c, 0x9d, 0xcd, 0xf0, 0x4b, 0x99, 0x32, 0x47,
0xca, 0x08, 0xdd, 0x0c, 0x5d, 0x56, 0x3a, 0xeb, 0x97, 0x6a, 0xf3, 0xca, 0xa0, 0xf2, 0x23, 0x6d,
0x65, 0x48, 0x49, 0x72, 0x33, 0x59, 0x33, 0xd1, 0x87, 0xe4, 0x19, 0x89, 0x94, 0x46, 0xbe, 0x03,
0x5d, 0x52, 0xdf, 0x27, 0xec, 0x9c, 0x0d, 0xb6, 0xc5, 0x31, 0x24, 0x23, 0xfc, 0x9c, 0x22, 0x79,
0xbe, 0x0b, 0x51, 0xa1, 0x0c, 0x2e, 0x41, 0x6f, 0x84, 0x54, 0xda, 0x82, 0x42, 0xc2, 0x90, 0xae,
0xc1, 0x05, 0x1c, 0xbc, 0x7a, 0x87, 0xca, 0x4c, 0x0a, 0xdd, 0x44, 0xf7, 0x60, 0x6b, 0x6c, 0xa7,
0x85, 0x0f, 0x96, 0xae, 0x10, 0x70, 0xb8, 0x62, 0xa9, 0x8f, 0xac, 0x79, 0xfa, 0x10, 0xbd, 0xcc,
0x31, 0xdf, 0x87, 0x98, 0xbc, 0xb3, 0x1f, 0xb8, 0xa2, 0xdb, 0xbf, 0xfa, 0xcd, 0x0f, 0x83, 0xe4,
0xa1, 0x1a, 0xc3, 0x1f, 0x21, 0xba, 0x57, 0x79, 0xce, 0x4f, 0x65, 0xdb, 0x56, 0x59, 0xb7, 0x4a,
0xcf, 0x36, 0xe1, 0xaa, 0x91, 0xe8, 0xf0, 0x37, 0x88, 0xab, 0xa2, 0xfc, 0xb2, 0xdd, 0xbb, 0xbe,
0x34, 0xbd, 0xfa, 0xd7, 0xd7, 0x1c, 0x1f, 0x32, 0xfe, 0x04, 0xbd, 0xc5, 0xc6, 0xb0, 0x27, 0x6d,
0x0f, 0x2e, 0x78, 0xba, 0x89, 0xcd, 0x73, 0xa2, 0x33, 0x60, 0x43, 0xf6, 0x1e, 0x87, 0xbf, 0xbd,
0xfd, 0x0d, 0x00, 0x00, 0xff, 0xff, 0x53, 0xb5, 0xeb, 0x31, 0x13, 0x02, 0x00, 0x00,
}

9
examples/server/proto/example/example.proto
View File

@ -5,6 +5,7 @@ package go.micro.srv.example;
service Example {
rpc Call(Request) returns (Response) {}
rpc Stream(StreamingRequest) returns (stream StreamingResponse) {}
rpc PingPong(stream Ping) returns (stream Pong) {}
}
message Message {
@ -26,3 +27,11 @@ message StreamingRequest {
message StreamingResponse {
int64 count = 1;
}
message Ping {
int64 stroke = 1;
}
message Pong {
int64 stroke = 1;
}

17
server/rpc_codec.go
View File

@ -60,9 +60,20 @@ func newRpcPlusCodec(req *transport.Message, socket transport.Socket, c codec.Ne
return r
}
func (c *rpcPlusCodec) ReadRequestHeader(r *request) error {
m := codec.Message{
Headers: c.req.Header,
func (c *rpcPlusCodec) ReadRequestHeader(r *request, first bool) error {
m := codec.Message{Headers: c.req.Header}
if !first {
var tm transport.Message
if err := c.socket.Recv(&tm); err != nil {
return err
}
c.buf.rbuf.Reset()
if _, err := c.buf.rbuf.Write(tm.Body); err != nil {
return err
}
m.Headers = tm.Header
}
err := c.codec.ReadHeader(&m, codec.Request)

78
server/rpc_stream.go Normal file
View File

@ -0,0 +1,78 @@
package server
import (
"log"
"sync"
"golang.org/x/net/context"
)
// Implements the Streamer interface
type rpcStream struct {
sync.RWMutex
seq uint64
closed bool
err error
request Request
codec serverCodec
context context.Context
}
func (r *rpcStream) Context() context.Context {
return r.context
}
func (r *rpcStream) Request() Request {
return r.request
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
seq := r.seq
r.seq++
resp := response{
ServiceMethod: r.request.Method(),
Seq: seq,
}
err := r.codec.WriteResponse(&resp, msg, false)
if err != nil {
log.Println("rpc: writing response:", err)
}
return err
}
func (r *rpcStream) Recv(msg interface{}) error {
r.Lock()
defer r.Unlock()
req := request{}
if err := r.codec.ReadRequestHeader(&req, false); err != nil {
// discard body
r.codec.ReadRequestBody(nil)
return err
}
if err := r.codec.ReadRequestBody(msg); err != nil {
return err
}
return nil
}
func (r *rpcStream) Error() error {
r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
r.Lock()
defer r.Unlock()
r.closed = true
return r.codec.Close()
}

93
server/rpcplus_server.go
View File

@ -102,14 +102,19 @@ func prepareMethod(method reflect.Method) *methodType {
mtype := method.Type
mname := method.Name
var replyType, argType, contextType reflect.Type
var stream bool
stream := false
// Method must be exported.
if method.PkgPath != "" {
return nil
}
switch mtype.NumIn() {
case 3:
// assuming streaming
argType = mtype.In(2)
contextType = mtype.In(1)
stream = true
case 4:
// method that takes a context
argType = mtype.In(2)
@ -120,35 +125,23 @@ func prepareMethod(method reflect.Method) *methodType {
return nil
}
if stream {
// check stream type
streamType := reflect.TypeOf((*Streamer)(nil)).Elem()
if !argType.Implements(streamType) {
log.Println(mname, "argument does not implement Streamer interface:", argType)
return nil
}
} else {
// if not stream check the replyType
// First arg need not be a pointer.
if !isExportedOrBuiltinType(argType) {
log.Println(mname, "argument type not exported:", argType)
return nil
}
// the second argument will tell us if it's a streaming call
// or a regular call
if replyType.Kind() == reflect.Func {
// this is a streaming call
stream = true
if replyType.NumIn() != 1 {
log.Println("method", mname, "sendReply has wrong number of ins:", replyType.NumIn())
return nil
}
if replyType.In(0).Kind() != reflect.Interface {
log.Println("method", mname, "sendReply parameter type not an interface:", replyType.In(0))
return nil
}
if replyType.NumOut() != 1 {
log.Println("method", mname, "sendReply has wrong number of outs:", replyType.NumOut())
return nil
}
if returnType := replyType.Out(0); returnType != typeOfError {
log.Println("method", mname, "sendReply returns", returnType.String(), "not error")
return nil
}
} else if replyType.Kind() != reflect.Ptr {
if replyType.Kind() != reflect.Ptr {
log.Println("method", mname, "reply type not a pointer:", replyType)
return nil
}
@ -158,6 +151,8 @@ func prepareMethod(method reflect.Method) *methodType {
log.Println("method", mname, "reply type not exported:", replyType)
return nil
}
}
// Method needs one out.
if mtype.NumOut() != 1 {
log.Println("method", mname, "has wrong number of outs:", mtype.NumOut())
@ -242,10 +237,11 @@ func (s *service) call(ctx context.Context, server *server, sending *sync.Mutex,
service: s.name,
contentType: ct,
method: req.ServiceMethod,
request: argv.Interface(),
}
if !mtype.stream {
r.request = argv.Interface()
fn := func(ctx context.Context, req Request, rsp interface{}) error {
returnValues = function.Call([]reflect.Value{s.rcvr, mtype.prepareContext(ctx), reflect.ValueOf(req.Request()), reflect.ValueOf(rsp)})
@ -276,40 +272,16 @@ func (s *service) call(ctx context.Context, server *server, sending *sync.Mutex,
// keep track of the type, to make sure we return
// the same one consistently
var lastError error
var firstType reflect.Type
sendReply := func(oneReply interface{}) error {
// we already triggered an error, we're done
if lastError != nil {
return lastError
}
// check the oneReply has the right type using reflection
typ := reflect.TypeOf(oneReply)
if firstType == nil {
firstType = typ
} else {
if firstType != typ {
log.Println("passing wrong type to sendReply",
firstType, "!=", typ)
lastError = errors.New("rpc: passing wrong type to sendReply")
return lastError
}
}
lastError = server.sendResponse(sending, req, oneReply, codec, "", false)
if lastError != nil {
return lastError
}
// we manage to send, we're good
return nil
stream := &rpcStream{
context: ctx,
codec: codec,
request: r,
}
// Invoke the method, providing a new value for the reply.
fn := func(ctx context.Context, req Request, rspFn interface{}) error {
returnValues = function.Call([]reflect.Value{s.rcvr, mtype.prepareContext(ctx), reflect.ValueOf(req.Request()), reflect.ValueOf(rspFn)})
fn := func(ctx context.Context, req Request, stream interface{}) error {
returnValues = function.Call([]reflect.Value{s.rcvr, mtype.prepareContext(ctx), reflect.ValueOf(stream)})
if err := returnValues[0].Interface(); err != nil {
// the function returned an error, we use that
return err.(error)
@ -331,7 +303,7 @@ func (s *service) call(ctx context.Context, server *server, sending *sync.Mutex,
r.stream = true
errmsg := ""
if err := fn(ctx, r, reflect.ValueOf(sendReply).Interface()); err != nil {
if err := fn(ctx, r, stream); err != nil {
errmsg = err.Error()
}
@ -417,6 +389,11 @@ func (server *server) readRequest(codec serverCodec) (service *service, mtype *m
codec.ReadRequestBody(nil)
return
}
// is it a streaming request? then we don't read the body
if mtype.stream {
codec.ReadRequestBody(nil)
return
}
// Decode the argument value.
argIsValue := false // if true, need to indirect before calling.
@ -443,7 +420,7 @@ func (server *server) readRequest(codec serverCodec) (service *service, mtype *m
func (server *server) readRequestHeader(codec serverCodec) (service *service, mtype *methodType, req *request, keepReading bool, err error) {
// Grab the request header.
req = server.getRequest()
err = codec.ReadRequestHeader(req)
err = codec.ReadRequestHeader(req, true)
if err != nil {
req = nil
if err == io.EOF || err == io.ErrUnexpectedEOF {
@ -478,7 +455,7 @@ func (server *server) readRequestHeader(codec serverCodec) (service *service, mt
}
type serverCodec interface {
ReadRequestHeader(*request) error
ReadRequestHeader(*request, bool) error
ReadRequestBody(interface{}) error
WriteResponse(*response, interface{}, bool) error

16
server/server.go
View File

@ -35,6 +35,7 @@ import (
log "github.com/golang/glog"
"github.com/pborman/uuid"
"golang.org/x/net/context"
)
type Server interface {
@ -61,10 +62,23 @@ type Request interface {
Method() string
ContentType() string
Request() interface{}
// indicates whether the response should be streaming
// indicates whether the request will be streamed
Stream() bool
}
// Streamer represents a stream established with a client.
// A stream can be bidirectional which is indicated by the request.
// The last error will be left in Error().
// EOF indicated end of the stream.
type Streamer interface {
Context() context.Context
Request() Request
Send(interface{}) error
Recv(interface{}) error
Error() error
Close() error
}
type Option func(*options)
var (

6
server/server_wrapper.go
View File

@ -19,3 +19,9 @@ type HandlerWrapper func(HandlerFunc) HandlerFunc
// SubscriberWrapper wraps the SubscriberFunc and returns the equivalent
type SubscriberWrapper func(SubscriberFunc) SubscriberFunc
// StreamerWrapper wraps a Streamer interface and returns the equivalent.
// Because streams exist for the lifetime of a method invocation this
// is a convenient way to wrap a Stream as its in use for trace, monitoring,
// metrics, etc.
type StreamerWrapper func(Streamer) Streamer

72
transport/http_transport.go
View File

@ -23,16 +23,21 @@ type httpTransportClient struct {
addr string
conn net.Conn
dialOpts dialOptions
r chan *http.Request
once sync.Once
sync.Mutex
r chan *http.Request
bl []*http.Request
buff *bufio.Reader
}
type httpTransportSocket struct {
r *http.Request
r chan *http.Request
conn net.Conn
once sync.Once
sync.Mutex
buff *bufio.Reader
}
type httpTransportListener struct {
@ -68,7 +73,14 @@ func (h *httpTransportClient) Send(m *Message) error {
Host: h.addr,
}
h.r <- req
h.Lock()
h.bl = append(h.bl, req)
select {
case h.r <- h.bl[0]:
h.bl = h.bl[1:]
default:
}
h.Unlock()
return req.Write(h.conn)
}
@ -134,17 +146,23 @@ func (h *httpTransportSocket) Recv(m *Message) error {
return errors.New("message passed in is nil")
}
b, err := ioutil.ReadAll(h.r.Body)
r, err := http.ReadRequest(h.buff)
if err != nil {
return err
}
h.r.Body.Close()
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return err
}
r.Body.Close()
mr := &Message{
Header: make(map[string]string),
Body: b,
}
for k, v := range h.r.Header {
for k, v := range r.Header {
if len(v) > 0 {
mr.Header[k] = v[0]
} else {
@ -152,6 +170,11 @@ func (h *httpTransportSocket) Recv(m *Message) error {
}
}
select {
case h.r <- r:
default:
}
*m = *mr
return nil
}
@ -159,8 +182,11 @@ func (h *httpTransportSocket) Recv(m *Message) error {
func (h *httpTransportSocket) Send(m *Message) error {
b := bytes.NewBuffer(m.Body)
defer b.Reset()
r := <-h.r
rsp := &http.Response{
Header: h.r.Header,
Header: r.Header,
Body: &buffer{b},
Status: "200 OK",
StatusCode: 200,
@ -174,6 +200,11 @@ func (h *httpTransportSocket) Send(m *Message) error {
rsp.Header.Set(k, v)
}
select {
case h.r <- r:
default:
}
return rsp.Write(h.conn)
}
@ -199,7 +230,14 @@ func (h *httpTransportSocket) error(m *Message) error {
}
func (h *httpTransportSocket) Close() error {
return h.conn.Close()
err := h.conn.Close()
h.once.Do(func() {
h.Lock()
h.buff.Reset(nil)
h.buff = nil
h.Unlock()
})
return err
}
func (h *httpTransportListener) Addr() string {
@ -211,18 +249,19 @@ func (h *httpTransportListener) Close() error {
}
func (h *httpTransportListener) Accept(fn func(Socket)) error {
srv := &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
conn, _, err := w.(http.Hijacker).Hijack()
for {
c, err := h.listener.Accept()
if err != nil {
return
return err
}
sock := &httpTransportSocket{
conn: conn,
r: r,
conn: c,
buff: bufio.NewReader(c),
r: make(chan *http.Request, 1),
}
go func() {
// TODO: think of a better error response strategy
defer func() {
if r := recover(); r != nil {
@ -231,10 +270,9 @@ func (h *httpTransportListener) Accept(fn func(Socket)) error {
}()
fn(sock)
}),
}()
}
return srv.Serve(h.listener)
return nil
}
func (h *httpTransport) Dial(addr string, opts ...DialOption) (Client, error) {