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