jsonrpc

About

• Simple, Poetic, Pithy.
• Compliance with JSON-RPC 2.0.

Install

$ go get github.com/osamingo/jsonrpc/v2@latest

Usage

package main

import (
	"context"
	"log"
	"net/http"

	"github.com/goccy/go-json"
	"github.com/osamingo/jsonrpc/v2"
)

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

	PositionalHandler struct{}
	PositionalParams  []int
	PositionalResult  struct {
		Message []int `json:"message"`
	}
)

func (h EchoHandler) ServeJSONRPC(c context.Context, params *json.RawMessage) (any, *jsonrpc.Error) {

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

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

func (h PositionalHandler) ServeJSONRPC(c context.Context, params *json.RawMessage) (any, **jsonrpc.Error) {

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

	return PositionalResult{
		Message: p,
	}, nil
}

func main() {

	mr := jsonrpc.NewMethodRepository()

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

	if err := mr.RegisterMethod("Main.Positional", PositionalHandler{}, PositionalParams{}, PositionalResult{}); err != nil {
		log.Fatalln(err)
	}

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

	if err := http.ListenAndServe(":8080", http.DefaultServeMux); err != nil {
		log.Fatalln(err)
	}
}

Advanced

package main

import (
	"log"
	"net/http"

	"github.com/osamingo/jsonrpc/v2"
)

type (
	HandleParamsResulter interface {
		jsonrpc.Handler
		Name() string
		Params() any
		Result() any
	}
	Servicer interface {
		MethodName(HandleParamsResulter) string
		Handlers() []HandleParamsResulter
	}
	UserService struct {
		SignUpHandler HandleParamsResulter
		SignInHandler HandleParamsResulter
	}
)

func (us *UserService) MethodName(h HandleParamsResulter) string {
	return "UserService." + h.Name()
}

func (us *UserService) Handlers() []HandleParamsResulter {
	return []HandleParamsResulter{us.SignUpHandler, us.SignInHandler}
}

func NewUserService() *UserService {
	return &UserService{
	// Initialize handlers
	}
}

func main() {

	mr := jsonrpc.NewMethodRepository()

	for _, s := range []Servicer{NewUserService()} {
		for _, h := range s.Handlers() {
			mr.RegisterMethod(s.MethodName(h), h, h.Params(), h.Result())
		}
	}

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

	if err := http.ListenAndServe(":8080", http.DefaultServeMux); 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"
}

Invoke the Positional method

POST /jrpc HTTP/1.1
Accept: */*
Content-Length: 133
Content-Type: application/json
Host: localhost:8080
User-Agent: curl/7.61.1

{
  "jsonrpc": "2.0",
  "method": "Main.Positional",
  "params": [3,1,1,3,5,3],
  "id": "243a718a-2ebb-4e32-8cc8-210c39e8a14b"
}

HTTP/1.1 200 OK
Content-Length: 97
Content-Type: application/json
Date: Mon, 05 Nov 2018 11:23:35 GMT

{
  "jsonrpc": "2.0",
  "result": {
    "message": [3,1,1,3,5,3]
  },
  "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.