forked from zyxar/argo
/
json2.go
116 lines (95 loc) · 2.99 KB
/
json2.go
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package rpc
// based on "github.com/gorilla/rpc/v2/json2"
// Copyright 2009 The Go Authors. All rights reserved.
// Copyright 2012 The Gorilla Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
import (
"bytes"
"encoding/json"
"errors"
"io"
)
// ----------------------------------------------------------------------------
// Request and Response
// ----------------------------------------------------------------------------
// clientRequest represents a JSON-RPC request sent by a client.
type clientRequest struct {
// JSON-RPC protocol.
Version string `json:"jsonrpc"`
// A String containing the name of the method to be invoked.
Method string `json:"method"`
// Object to pass as request parameter to the method.
Params interface{} `json:"params"`
// The request id. This can be of any type. It is used to match the
// response with the request that it is replying to.
Id uint64 `json:"id"`
}
// clientResponse represents a JSON-RPC response returned to a client.
type clientResponse struct {
Version string `json:"jsonrpc"`
Result *json.RawMessage `json:"result"`
Error *json.RawMessage `json:"error"`
Id *uint64 `json:"id"`
}
// EncodeClientRequest encodes parameters for a JSON-RPC client request.
func EncodeClientRequest(method string, args interface{}) (*bytes.Buffer, error) {
var buf bytes.Buffer
c := &clientRequest{
Version: "2.0",
Method: method,
Params: args,
Id: reqid(),
}
if err := json.NewEncoder(&buf).Encode(c); err != nil {
return nil, err
}
return &buf, nil
}
func (c clientResponse) decode(reply interface{}) error {
if c.Error != nil {
jsonErr := &Error{}
if err := json.Unmarshal(*c.Error, jsonErr); err != nil {
return &Error{
Code: E_SERVER,
Message: string(*c.Error),
}
}
return jsonErr
}
if c.Result == nil {
return ErrNullResult
}
return json.Unmarshal(*c.Result, reply)
}
// DecodeClientResponse decodes the response body of a client request into
// the interface reply.
func DecodeClientResponse(r io.Reader, reply interface{}) error {
var c clientResponse
if err := json.NewDecoder(r).Decode(&c); err != nil {
return err
}
return c.decode(reply)
}
type ErrorCode int
const (
E_PARSE ErrorCode = -32700
E_INVALID_REQ ErrorCode = -32600
E_NO_METHOD ErrorCode = -32601
E_BAD_PARAMS ErrorCode = -32602
E_INTERNAL ErrorCode = -32603
E_SERVER ErrorCode = -32000
)
var ErrNullResult = errors.New("result is null")
type Error struct {
// A Number that indicates the error type that occurred.
Code ErrorCode `json:"code"` /* required */
// A String providing a short description of the error.
// The message SHOULD be limited to a concise single sentence.
Message string `json:"message"` /* required */
// A Primitive or Structured value that contains additional information about the error.
Data interface{} `json:"data"` /* optional */
}
func (e *Error) Error() string {
return e.Message
}