micro/codec/jsonrpc/client.go
2019-01-18 10:12:57 +00:00

98 lines
1.8 KiB
Go

package jsonrpc
import (
"encoding/json"
"fmt"
"io"
"sync"
"github.com/micro/go-micro/codec"
)
type clientCodec struct {
dec *json.Decoder // for reading JSON values
enc *json.Encoder // for writing JSON values
c io.Closer
// temporary work space
req clientRequest
resp clientResponse
sync.Mutex
pending map[interface{}]string
}
type clientRequest struct {
Method string `json:"method"`
Params [1]interface{} `json:"params"`
ID interface{} `json:"id"`
}
type clientResponse struct {
ID interface{} `json:"id"`
Result *json.RawMessage `json:"result"`
Error interface{} `json:"error"`
}
func newClientCodec(conn io.ReadWriteCloser) *clientCodec {
return &clientCodec{
dec: json.NewDecoder(conn),
enc: json.NewEncoder(conn),
c: conn,
pending: make(map[interface{}]string),
}
}
func (c *clientCodec) Write(m *codec.Message, b interface{}) error {
c.Lock()
c.pending[m.Id] = m.Method
c.Unlock()
c.req.Method = m.Method
c.req.Params[0] = b
c.req.ID = m.Id
return c.enc.Encode(&c.req)
}
func (r *clientResponse) reset() {
r.ID = 0
r.Result = nil
r.Error = nil
}
func (c *clientCodec) ReadHeader(m *codec.Message) error {
c.resp.reset()
if err := c.dec.Decode(&c.resp); err != nil {
return err
}
c.Lock()
m.Method = c.pending[c.resp.ID]
delete(c.pending, c.resp.ID)
c.Unlock()
m.Error = ""
m.Id = fmt.Sprintf("%v", c.resp.ID)
if c.resp.Error != nil {
x, ok := c.resp.Error.(string)
if !ok {
return fmt.Errorf("invalid error %v", c.resp.Error)
}
if x == "" {
x = "unspecified error"
}
m.Error = x
}
return nil
}
func (c *clientCodec) ReadBody(x interface{}) error {
if x == nil || c.resp.Result == nil {
return nil
}
return json.Unmarshal(*c.resp.Result, x)
}
func (c *clientCodec) Close() error {
return c.c.Close()
}