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/*
    This file is part of go-ethereum

    go-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    go-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
package rpc

import (
    "encoding/json"
    "io"
    "net/http"
)

type jsonWrapper struct{}

func (self jsonWrapper) Send(writer io.Writer, v interface{}) (n int, err error) {
    var payload []byte
    payload, err = json.Marshal(v)
    if err != nil {
        jsonlogger.Fatalln("Error marshalling JSON", err)
        return 0, err
    }
    jsonlogger.Infof("Sending payload: %s", payload)

    return writer.Write(payload)
}

func (self jsonWrapper) ParseRequestBody(req *http.Request) (RpcRequest, error) {
    var reqParsed RpcRequest

    // Convert JSON to native types
    d := json.NewDecoder(req.Body)
    // d.UseNumber()
    defer req.Body.Close()
    err := d.Decode(&reqParsed)

    if err != nil {
        jsonlogger.Errorln("Error decoding JSON: ", err)
        return reqParsed, err
    }
    jsonlogger.DebugDetailf("Parsed request: %s", reqParsed)

    return reqParsed, nil
}

func (self jsonWrapper) GetRequestReply(xeth *EthereumApi, req *RpcRequest, reply *interface{}) error {
    // call function for request method
    jsonlogger.DebugDetailf("%T %s", req.Params, req.Params)
    switch req.Method {
    case "eth_coinbase":
        return xeth.GetCoinbase(reply)
    case "eth_listening":
        return xeth.GetIsListening(reply)
    case "eth_mining":
        return xeth.GetIsMining(reply)
    case "eth_peerCount":
        return xeth.GetPeerCount(reply)
    case "eth_countAt":
        args, err := req.ToGetTxCountArgs()
        if err != nil {
            return err
        }
        return xeth.GetTxCountAt(args, reply)
    case "eth_codeAt":
        args, err := req.ToGetCodeAtArgs()
        if err != nil {
            return err
        }
        return xeth.GetCodeAt(args, reply)
    case "eth_balanceAt":
        args, err := req.ToGetBalanceArgs()
        if err != nil {
            return err
        }
        return xeth.GetBalanceAt(args, reply)
    case "eth_stateAt":
        args, err := req.ToGetStorageArgs()
        if err != nil {
            return err
        }
        return xeth.GetStorageAt(args, reply)
    case "eth_blockByNumber", "eth_blockByHash":
        args, err := req.ToGetBlockArgs()
        if err != nil {
            return err
        }
        return xeth.GetBlock(args, reply)
    default:
        return NewErrorResponse(ErrorNotImplemented)
    }

    jsonlogger.DebugDetailf("Reply: %T %s", reply, reply)
    return nil
}

var JSON jsonWrapper