148 lines
3.2 KiB
Go
148 lines
3.2 KiB
Go
package client
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
|
|
"github.com/micro/go-micro/codec"
|
|
"github.com/micro/go-micro/codec/jsonrpc"
|
|
"github.com/micro/go-micro/codec/protorpc"
|
|
"github.com/micro/go-micro/transport"
|
|
)
|
|
|
|
const (
|
|
lastStreamResponseError = "EOS"
|
|
)
|
|
|
|
// serverError represents an error that has been returned from
|
|
// the remote side of the RPC connection.
|
|
type serverError string
|
|
|
|
func (e serverError) Error() string {
|
|
return string(e)
|
|
}
|
|
|
|
// errShutdown holds the specific error for closing/closed connections
|
|
var (
|
|
errShutdown = errors.New("connection is shut down")
|
|
)
|
|
|
|
type rpcPlusCodec struct {
|
|
client transport.Client
|
|
codec codec.Codec
|
|
|
|
req *transport.Message
|
|
buf *readWriteCloser
|
|
}
|
|
|
|
type readWriteCloser struct {
|
|
wbuf *bytes.Buffer
|
|
rbuf *bytes.Buffer
|
|
}
|
|
|
|
type clientCodec interface {
|
|
WriteRequest(*request, interface{}) error
|
|
ReadResponseHeader(*response) error
|
|
ReadResponseBody(interface{}) error
|
|
|
|
Close() error
|
|
}
|
|
|
|
type request struct {
|
|
Service string
|
|
ServiceMethod string // format: "Service.Method"
|
|
Seq uint64 // sequence number chosen by client
|
|
next *request // for free list in Server
|
|
}
|
|
|
|
type response struct {
|
|
ServiceMethod string // echoes that of the Request
|
|
Seq uint64 // echoes that of the request
|
|
Error string // error, if any.
|
|
next *response // for free list in Server
|
|
}
|
|
|
|
var (
|
|
defaultContentType = "application/octet-stream"
|
|
|
|
defaultCodecs = map[string]codec.NewCodec{
|
|
"application/json": jsonrpc.NewCodec,
|
|
"application/json-rpc": jsonrpc.NewCodec,
|
|
"application/protobuf": protorpc.NewCodec,
|
|
"application/proto-rpc": protorpc.NewCodec,
|
|
"application/octet-stream": protorpc.NewCodec,
|
|
}
|
|
)
|
|
|
|
func (rwc *readWriteCloser) Read(p []byte) (n int, err error) {
|
|
return rwc.rbuf.Read(p)
|
|
}
|
|
|
|
func (rwc *readWriteCloser) Write(p []byte) (n int, err error) {
|
|
return rwc.wbuf.Write(p)
|
|
}
|
|
|
|
func (rwc *readWriteCloser) Close() error {
|
|
rwc.rbuf.Reset()
|
|
rwc.wbuf.Reset()
|
|
return nil
|
|
}
|
|
|
|
func newRpcPlusCodec(req *transport.Message, client transport.Client, c codec.NewCodec) *rpcPlusCodec {
|
|
rwc := &readWriteCloser{
|
|
wbuf: bytes.NewBuffer(nil),
|
|
rbuf: bytes.NewBuffer(nil),
|
|
}
|
|
r := &rpcPlusCodec{
|
|
buf: rwc,
|
|
client: client,
|
|
codec: c(rwc),
|
|
req: req,
|
|
}
|
|
return r
|
|
}
|
|
|
|
func (c *rpcPlusCodec) WriteRequest(req *request, body interface{}) error {
|
|
c.buf.wbuf.Reset()
|
|
m := &codec.Message{
|
|
Id: req.Seq,
|
|
Target: req.Service,
|
|
Method: req.ServiceMethod,
|
|
Type: codec.Request,
|
|
Header: map[string]string{},
|
|
}
|
|
if err := c.codec.Write(m, body); err != nil {
|
|
return err
|
|
}
|
|
c.req.Body = c.buf.wbuf.Bytes()
|
|
for k, v := range m.Header {
|
|
c.req.Header[k] = v
|
|
}
|
|
return c.client.Send(c.req)
|
|
}
|
|
|
|
func (c *rpcPlusCodec) ReadResponseHeader(r *response) error {
|
|
var m transport.Message
|
|
if err := c.client.Recv(&m); err != nil {
|
|
return err
|
|
}
|
|
c.buf.rbuf.Reset()
|
|
c.buf.rbuf.Write(m.Body)
|
|
var me codec.Message
|
|
err := c.codec.ReadHeader(&me, codec.Response)
|
|
r.ServiceMethod = me.Method
|
|
r.Seq = me.Id
|
|
r.Error = me.Error
|
|
return err
|
|
}
|
|
|
|
func (c *rpcPlusCodec) ReadResponseBody(b interface{}) error {
|
|
return c.codec.ReadBody(b)
|
|
}
|
|
|
|
func (c *rpcPlusCodec) Close() error {
|
|
c.buf.Close()
|
|
c.codec.Close()
|
|
return c.client.Close()
|
|
}
|