# README

arpc

ARPC is the Acoshift's opinionated HTTP-RPC styled api

Installation

go get -u github.com/acoshift/arpc/v2

HTTP Status Code

ARPC will response http with only these 3 status codes

200 OK - function works as expected
400 Bad Request - developer (api caller) error, should never happened in production
500 Internal Server Error - server error, should never happened (server broken)

Example Responses

Success Result

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
	"ok": true,
	"result": {
		// result object
	}
}

Error Result

Validate error
Precondition failed
User error

HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8

{
	"ok": false,
	"error": {
		"message": "some error message"
	}
}

Function not found

Developer (api caller) call not exists function

HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=utf-8

{
	"ok": false,
	"error": {
		"message": "not found"
	}
}

Unsupported Content-Type

Developer (api caller) send invalid content type

HTTP/1.1 400 Bad Request
Content-Type: application/json; charset=utf-8

{
	"ok": false,
	"error": {
		"message": "unsupported content type"
	}
}

Internal Server Error

Server broken !!!

HTTP/1.1 500 Internal Server Error
Content-Type: application/json; charset=utf-8

{
	"ok": false,
	"error": {} // internal error always return empty object
}

How to use

package main

import (
	"context"
	"log"
	"net/http"
	
	"github.com/acoshift/arpc/v2"
)

func main() { 
	// create new manager 
	am := arpc.New()

	mux := http.NewServeMux()
	mux.Handle("/hello", am.Handle(Hello))
	
	// start server 
	log.Fatal(http.ListenAndServe(":8080", mux))
}

type HelloParams struct {
	Name string `json:"name"`
}

func (r *HelloParams) Valid() error {
	if r.Name == "" {
		return arpc.NewError("name required")
	}
	return nil
}

type HelloResult struct {
	Message string `json:"message"`
}

func Hello(ctx context.Context, req *HelloParams) (*HelloResult, error) {
	return &HelloResult{
		Message: "hello " + req.Name,
	}, nil
}