Add json codec
This commit is contained in:
Asim
parent
609a59d3ab
commit
80f53ab176
@ -4,6 +4,7 @@ import (
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"bytes"
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"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/codec/json"
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"github.com/micro/go-micro/codec/proto"
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"github.com/micro/go-micro/transport"
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rpc "github.com/youtube/vitess/go/rpcplus"
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@ -26,8 +27,8 @@ 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.NewClientCodec,
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// "application/json-rpc": jsonrpc.NewClientCodec,
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"application/json": json.NewCodec,
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"application/json-rpc": json.NewCodec,
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"application/protobuf": proto.NewCodec,
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"application/proto-rpc": proto.NewCodec,
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"application/octet-stream": proto.NewCodec,
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97
codec/json/client.go
Normal file
97
codec/json/client.go
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@ -0,0 +1,97 @@
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package json
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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[uint64]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 uint64 `json:"id"`
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}
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type clientResponse struct {
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ID uint64 `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[uint64]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.Method
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c.Unlock()
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c.req.Method = m.Method
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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.Method = 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 = 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 {
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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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88
codec/json/json.go
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88
codec/json/json.go
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@ -0,0 +1,88 @@
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package json
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"github.com/micro/go-micro/codec"
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)
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type jsonCodec struct {
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buf *bytes.Buffer
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mt codec.MessageType
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rwc io.ReadWriteCloser
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c *clientCodec
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s *serverCodec
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}
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func (j *jsonCodec) Close() error {
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j.buf.Reset()
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return j.rwc.Close()
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}
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func (j *jsonCodec) String() string {
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return "json"
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}
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func (j *jsonCodec) Write(m *codec.Message, b interface{}) error {
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switch m.Type {
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case codec.Request:
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return j.c.Write(m, b)
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case codec.Response:
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return j.s.Write(m, b)
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case codec.Publication:
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data, err := json.Marshal(b)
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if err != nil {
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return err
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}
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_, err = j.rwc.Write(data)
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return err
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default:
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return fmt.Errorf("Unrecognised message type: %v", m.Type)
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}
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return nil
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}
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func (j *jsonCodec) ReadHeader(m *codec.Message, mt codec.MessageType) error {
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j.buf.Reset()
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j.mt = mt
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switch mt {
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case codec.Request:
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return j.s.ReadHeader(m)
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case codec.Response:
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return j.c.ReadHeader(m)
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case codec.Publication:
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io.Copy(j.buf, j.rwc)
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default:
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return fmt.Errorf("Unrecognised message type: %v", mt)
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}
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return nil
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}
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func (j *jsonCodec) ReadBody(b interface{}) error {
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switch j.mt {
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case codec.Request:
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return j.s.ReadBody(b)
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case codec.Response:
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return j.c.ReadBody(b)
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case codec.Publication:
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if b != nil {
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return json.Unmarshal(j.buf.Bytes(), b)
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}
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default:
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return fmt.Errorf("Unrecognised message type: %v", j.mt)
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}
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return nil
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}
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func NewCodec(rwc io.ReadWriteCloser) codec.Codec {
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return &jsonCodec{
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buf: bytes.NewBuffer(nil),
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rwc: rwc,
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c: newClientCodec(rwc),
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s: newServerCodec(rwc),
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}
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}
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111
codec/json/server.go
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111
codec/json/server.go
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@ -0,0 +1,111 @@
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package json
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import (
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"encoding/json"
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"errors"
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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 serverCodec 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 serverRequest
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resp serverResponse
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sync.Mutex
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seq uint64
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pending map[uint64]*json.RawMessage
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}
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type serverRequest struct {
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Method string `json:"method"`
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Params *json.RawMessage `json:"params"`
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ID *json.RawMessage `json:"id"`
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}
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type serverResponse struct {
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ID *json.RawMessage `json:"id"`
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Result interface{} `json:"result"`
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Error interface{} `json:"error"`
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}
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func newServerCodec(conn io.ReadWriteCloser) *serverCodec {
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return &serverCodec{
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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[uint64]*json.RawMessage),
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}
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}
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func (r *serverRequest) reset() {
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r.Method = ""
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if r.Params != nil {
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*r.Params = (*r.Params)[0:0]
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}
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if r.ID != nil {
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*r.ID = (*r.ID)[0:0]
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}
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}
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func (c *serverCodec) ReadHeader(m *codec.Message) error {
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c.req.reset()
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if err := c.dec.Decode(&c.req); err != nil {
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return err
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}
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m.Method = c.req.Method
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c.Lock()
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c.seq++
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c.pending[c.seq] = c.req.ID
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c.req.ID = nil
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m.Id = c.seq
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c.Unlock()
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return nil
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}
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func (c *serverCodec) ReadBody(x interface{}) error {
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if x == nil {
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return nil
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}
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var params [1]interface{}
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params[0] = x
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return json.Unmarshal(*c.req.Params, ¶ms)
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}
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var null = json.RawMessage([]byte("null"))
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func (c *serverCodec) Write(m *codec.Message, x interface{}) error {
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var resp serverResponse
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c.Lock()
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b, ok := c.pending[m.Id]
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if !ok {
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c.Unlock()
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return errors.New("invalid sequence number in response")
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}
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c.Unlock()
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if b == nil {
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// Invalid request so no id. Use JSON null.
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b = &null
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}
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resp.ID = b
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resp.Result = x
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if m.Error == "" {
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resp.Error = nil
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} else {
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resp.Error = m.Error
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}
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return c.enc.Encode(resp)
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}
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func (c *serverCodec) Close() error {
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return c.c.Close()
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}
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@ -4,6 +4,7 @@ import (
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"bytes"
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"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/codec/json"
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"github.com/micro/go-micro/codec/proto"
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"github.com/micro/go-micro/transport"
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rpc "github.com/youtube/vitess/go/rpcplus"
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@ -24,8 +25,8 @@ type readWriteCloser struct {
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var (
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defaultCodecs = map[string]codec.NewCodec{
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// "application/json": jsonrpc.NewServerCodec,
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// "application/json-rpc": jsonrpc.NewServerCodec,
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"application/json": json.NewCodec,
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"application/json-rpc": json.NewCodec,
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"application/protobuf": proto.NewCodec,
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"application/proto-rpc": proto.NewCodec,
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"application/octet-stream": proto.NewCodec,
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