jsonrpc

About

• Simple, Poetic, Pithy.
• No reflect package.
  • But reflect package is used only when invoke the debug handler.
• Support GAE/Go Standard Environment.
• Compliance with JSON-RPC 2.0.

Note: If you use Go 1.6, see v1.0.

Install

$ go get -u github.com/osamingo/jsonrpc

Usage

package main

import (
	"bytes"
	"context"
	"io"
	"log"
	"net/http"
	"net/http/httptest"
	"os"

	"github.com/intel-go/fastjson"
	"github.com/osamingo/jsonrpc"
)

type (
	EchoHandler struct{}
	EchoParams  struct {
		Name string `json:"name"`
	}
	EchoResult struct {
		Message string `json:"message"`
	}
)

func (h EchoHandler) ServeJSONRPC(c context.Context, params *fastjson.RawMessage) (interface{}, *jsonrpc.Error) {

	var p EchoParams
	if err := jsonrpc.Unmarshal(params, &p); err != nil {
		return nil, err
	}

	return EchoResult{
		Message: "Hello, " + p.Name,
	}, nil
}

func main() {

	mr := jsonrpc.NewMethodRepository()

	if err := mr.RegisterMethod("Main.Echo", EchoHandler{}, EchoParams{}, EchoResult{}); err != nil {
		log.Fatalln(err)
	}

	http.Handle("/jrpc", mr)
	http.HandleFunc("/jrpc/debug", mr.ServeDebug)

	srv := httptest.NewServer(http.DefaultServeMux)
	defer srv.Close()

	resp, err := http.Post(srv.URL+"/jrpc", "application/json", bytes.NewBufferString(`{
	  "jsonrpc": "2.0",
      "method": "Main.Echo",
      "params": {
        "name": "John Doe"
      },
      "id": "243a718a-2ebb-4e32-8cc8-210c39e8a14b"
    }`))
	if err != nil {
		log.Fatalln(err)
	}
	defer resp.Body.Close()
	if _, err := io.Copy(os.Stdout, resp.Body); err != nil {
		log.Fatalln(err)
	}
}

Result

Invoke the Echo method

POST /jrpc HTTP/1.1
Accept: application/json, */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 82
Content-Type: application/json
Host: localhost:8080
User-Agent: HTTPie/0.9.6

{
  "jsonrpc": "2.0",
  "method": "Main.Echo",
  "params": {
    "name": "John Doe"
  },
  "id": "243a718a-2ebb-4e32-8cc8-210c39e8a14b"
}

HTTP/1.1 200 OK
Content-Length: 68
Content-Type: application/json
Date: Mon, 28 Nov 2016 13:48:13 GMT

{
  "jsonrpc": "2.0",
  "result": {
    "message": "Hello, John Doe"
  },
  "id": "243a718a-2ebb-4e32-8cc8-210c39e8a14b"
}

Access to debug handler

GET /jrpc/debug HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate
Connection: keep-alive
Host: localhost:8080
User-Agent: HTTPie/0.9.6



HTTP/1.1 200 OK
Content-Length: 408
Content-Type: application/json
Date: Mon, 28 Nov 2016 13:56:24 GMT

[
  {
    "handler": "EchoHandler",
    "name": "Main.Echo",
    "params": {
      "$ref": "#/definitions/EchoParams",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "definitions": {
        "EchoParams": {
          "additionalProperties": false,
          "properties": {
            "name": {
              "type": "string"
            }
          },
          "required": [
            "name"
          ],
          "type": "object"
        }
      }
    },
    "result": {
      "$ref": "#/definitions/EchoResult",
      "$schema": "http://json-schema.org/draft-04/schema#",
      "definitions": {
        "EchoResult": {
          "additionalProperties": false,
          "properties": {
            "message": {
              "type": "string"
            }
          },
          "required": [
            "message"
          ],
          "type": "object"
        }
      }
    }
  }
]

License

Released under the MIT License.