path: root/rpc/jeth.go

package rpc

import (
    "encoding/json"
    "fmt"
    "github.com/ethereum/go-ethereum/jsre"
    "github.com/robertkrimen/otto"
)

type Jeth struct {
    ethApi *EthereumApi
    toVal  func(interface{}) otto.Value
    re     *jsre.JSRE
}

func NewJeth(ethApi *EthereumApi, toVal func(interface{}) otto.Value, re *jsre.JSRE) *Jeth {
    return &Jeth{ethApi, toVal, re}
}

func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id interface{}) (response otto.Value) {
    rpcerr := &RpcErrorObject{code, msg}
    call.Otto.Set("ret_jsonrpc", jsonrpcver)
    call.Otto.Set("ret_id", id)
    call.Otto.Set("ret_error", rpcerr)
    response, _ = call.Otto.Run(`
        ret_response = { jsonrpc: ret_jsonrpc, id: ret_id, error: ret_error };
    `)
    return
}

func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
    reqif, err := call.Argument(0).Export()
    if err != nil {
        return self.err(call, -32700, err.Error(), nil)
    }

    jsonreq, err := json.Marshal(reqif)
    var reqs []RpcRequest
    batch := true
    err = json.Unmarshal(jsonreq, &reqs)
    if err != nil {
        reqs = make([]RpcRequest, 1)
        err = json.Unmarshal(jsonreq, &reqs[0])
        batch = false
    }

    call.Otto.Set("response_len", len(reqs))
    call.Otto.Run("var ret_response = new Array(response_len);")

    for i, req := range reqs {
        var respif interface{}
        err = self.ethApi.GetRequestReply(&req, &respif)
        if err != nil {
            fmt.Println("Error response:", err)
            return self.err(call, -32603, err.Error(), req.Id)
        }
        call.Otto.Set("ret_jsonrpc", jsonrpcver)
        call.Otto.Set("ret_id", req.Id)

        res, _ := json.Marshal(respif)

        call.Otto.Set("ret_result", string(res))
        call.Otto.Set("response_idx", i)
        response, err = call.Otto.Run(`
        ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
        `)
    }

    if !batch {
        call.Otto.Run("ret_response = ret_response[0];")
    }

    if call.Argument(1).IsObject() {
        call.Otto.Set("callback", call.Argument(1))
        call.Otto.Run(`
        if (Object.prototype.toString.call(callback) == '[object Function]') {
            callback(null, ret_response);
        }
        `)
    }

    return
}