批处理JSON- RPC与大猩猩RPC

Question

好吧，我在服务器上工作。它提供网页服务和其他服务。

package main

import (
    "fmt"
    "log"
    "net/http"

    "github.com/gorilla/rpc"
    "github.com/gorilla/rpc/json"
)

type Service struct {
    Name string
}

type ServiceArgs struct {
    Str string
    Val float64
}

type ServiceReply struct {
    Message string
}

func (e *Service) DoSomething(request *http.Request, args *ServiceArgs, reply *ServiceReply) error {
    fmt.Println("DoSomething called remotely!")
    reply.Message = "OMG. It works."

    return nil
}

func main() {
    rpcHandler := rpc.NewServer()
    rpcHandler.RegisterCodec(json.NewCodec(), "application/json")
    rpcHandler.RegisterService(new(Service), "")
    http.Handle("/rpc", rpcHandler)

    http.Handle("/", http.StripPrefix("/", http.FileServer(http.Dir("."))))

    fmt.Println("Listening on port 8080.")
    if err := http.ListenAndServe(":8080", nil); err != nil {
        log.Fatalln(err)
    }
}

我在服务器端有一个API，我希望普通客户端能够访问这个API。为此，我开始学习更多关于JSON-RPC的知识。这就是我如何从网络浏览器调用Service.DoSomething。

var log = document.getElementById("log");
var request = new XMLHttpRequest();

var command = {
    "jsonrpc":"2.0",
    "method":"Service.DoSomething",
    "params":[{
        "Str":"pie",
        "Val":3.14
    }],
    "id":1
};

request.onreadystatechange = function() {
    if (request.readyState == 4 && request.status == 200) {
        var response = JSON.parse(request.responseText).result;
        log.textContent += response["Message"];
    } else {
        console.log(request.statusText);
    }
};

request.open("POST", "/rpc", true);
request.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
request.send(JSON.stringify(command));

这个很好用。我看到了“天哪，它起作用了”在我的浏览器中运行那个JavaScript。接下来，我想运行多个方法调用。我发现有一种方法可以向服务器发送“批处理”调用。所以我从JavaScript那里试了这个。

var command = [
    {"jsonrpc":"2.0","method":"Service.DoSomething","params":[{"Str":"pie","Val":3.14}],"id":1},
    {"jsonrpc":"2.0","method":"Service.DoSomething","params":[{"Str":"pie","Val":3.14}],"id":2}
];

request.send(JSON.stringify(command));

然而，这给了我一个400 (Bad Request)。我在哪里搞砸了语法吗？或者这是gorilla/rpc的问题？

Answer 1

根据Gorilla Toolkit JSON-RPC概述

此包遵循JSON-RPC1.0规范：

根据JSON-RPC规范和JSON-RPC谷歌小组讨论的说法，'batch‘是一个JSON-RPC2.0特性。

看起来大猩猩JSON不理解批处理查询。