78 lines
2.3 KiB
Go
78 lines
2.3 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package rpc implements the Ethereum JSON-RPC API.
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package rpc
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import (
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"encoding/json"
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"fmt"
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"reflect"
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"sync/atomic"
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"github.com/ethereum/go-ethereum/rpc/comms"
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"github.com/ethereum/go-ethereum/rpc/shared"
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)
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// Xeth is a native API interface to a remote node.
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type Xeth struct {
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client comms.EthereumClient
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reqId uint32
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}
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// NewXeth constructs a new native API interface to a remote node.
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func NewXeth(client comms.EthereumClient) *Xeth {
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return &Xeth{
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client: client,
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}
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}
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// Call invokes a method with the given parameters are the remote node.
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func (self *Xeth) Call(method string, params []interface{}) (map[string]interface{}, error) {
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// Assemble the json RPC request
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data, err := json.Marshal(params)
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if err != nil {
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return nil, err
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}
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req := &shared.Request{
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Id: atomic.AddUint32(&self.reqId, 1),
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Jsonrpc: "2.0",
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Method: method,
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Params: data,
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}
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// Send the request over and retrieve the response
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if err := self.client.Send(req); err != nil {
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return nil, err
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}
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res, err := self.client.Recv()
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if err != nil {
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return nil, err
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}
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// Ensure the response is valid, and extract the results
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success, isSuccessResponse := res.(*shared.SuccessResponse)
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failure, isFailureResponse := res.(*shared.ErrorResponse)
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switch {
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case isFailureResponse:
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return nil, fmt.Errorf("Method invocation failed: %v", failure.Error)
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case isSuccessResponse:
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return success.Result.(map[string]interface{}), nil
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default:
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return nil, fmt.Errorf("Invalid response type: %v", reflect.TypeOf(res))
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}
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}
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