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