329 lines
11 KiB
JavaScript
329 lines
11 KiB
JavaScript
'use strict';
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var inherits = require('inherits');
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var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
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var SigningKey = require('./signing-key.js');
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var utils = require('./utils.js');
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// The required methods a provider must support
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var methods = [
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'getBalance',
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'getTransactionCount',
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'getGasPrice',
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'sendTransaction',
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'call',
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'estimateGas'
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];
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// Manages JSON-RPC to an Ethereum node
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function Web3Connector(provider) {
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if (!(this instanceof Web3Connector)) { throw new Error('missing new'); }
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var nextMessageId = 1;
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utils.defineProperty(this, 'sendMessage', function(method, params) {
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return new Promise(function(resolve, reject) {
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provider.sendAsync({
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id: (nextMessageId++),
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jsonrpc: '2.0',
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method: method,
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params: params
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}, function(error, result) {
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if (error) {
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reject(error);
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} else {
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if (result.error) {
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var error = new Error(result.error.message);
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error.code = result.error.code;
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error.data = result.error.data;
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reject(error);
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} else {
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resolve(result.result);
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}
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}
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});
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});
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});
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}
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// Mimics Web3 interface
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function rpcSendAsync(url) {
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return {
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sendAsync: function(payload, callback) {
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var request = new XMLHttpRequest();
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request.open('POST', url, true);
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request.setRequestHeader('Content-Type','application/json');
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request.onreadystatechange = function() {
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if (request.readyState !== 4) { return; }
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if (typeof(callback) !== 'function') { return; }
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var result = request.responseText;
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try {
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callback(null, JSON.parse(result));
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} catch (error) {
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var responseError = new Error('invalid response');
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responseError.orginialError = error;
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responseError.data = result;
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callback(responseError);
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}
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};
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try {
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request.send(JSON.stringify(payload));
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} catch (error) {
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var connectionError = new Error('connection error');
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connectionError.error = error;
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callback(connectionError);
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}
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}
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}
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}
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function SendAsyncProvider(sendAsync) {
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if (!(this instanceof SendAsyncProvider)) { throw new Error('missing new'); }
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utils.defineProperty(this, 'client', new Web3Connector(sendAsync));
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}
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function validBlock(value) {
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if (value == null) { return 'latest'; }
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if (value === 'latest' || value === 'pending') { return value; }
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if (typeof(value) === 'number' && value == parseInt(value)) {
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return parseInt(value);
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}
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throw new Error('invalid blockNumber');
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}
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function postProcess(client, method, params, makeBN) {
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return new Promise(function(resolve, reject) {
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client.sendMessage(method, params).then(function (result) {
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if (!utils.isHexString(result)) {
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reject(new Error('invalid server response'));
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} else {
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result = result.substring(2);
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if (makeBN) {
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result = new utils.BN(result, 16);
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} else {
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result = parseInt(result, 16);
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}
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resolve(result);
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}
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}, function(error) {
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reject(error);
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});
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});
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}
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utils.defineProperty(SendAsyncProvider.prototype, 'getBalance', function(address, blockNumber) {
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address = SigningKey.getAddress(address);
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return postProcess(this.client, 'eth_getBalance', [address, validBlock(blockNumber)], true);
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});
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utils.defineProperty(SendAsyncProvider.prototype, 'getTransactionCount', function(address, blockNumber) {
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address = SigningKey.getAddress(address);
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return postProcess(this.client, 'eth_getTransactionCount', [address, validBlock(blockNumber)], false);
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});
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utils.defineProperty(SendAsyncProvider.prototype, 'getGasPrice', function() {
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return postProcess(this.client, 'eth_gasPrice', [], true);
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});
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utils.defineProperty(SendAsyncProvider.prototype, 'sendTransaction', function(signedTransaction) {
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if (!utils.isHexString(signedTransaction)) { throw new Error('invalid transaction'); }
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return this.client.sendMessage('eth_sendRawTransaction', [signedTransaction]);
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});
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utils.defineProperty(SendAsyncProvider.prototype, 'call', function(transaction) {
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// @TODO: check validTransaction?
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return this.client.sendMessage('eth_call', [transaction]);
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});
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utils.defineProperty(SendAsyncProvider.prototype, 'estimateGas', function(transaction) {
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// @TODO: check validTransaction?
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return postProcess(this.client, 'eth_estimateGas', [transaction], true);
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});
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var providers = {};
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function HttpProvider(url) {
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if (!(this instanceof HttpProvider)) { throw new Error('missing new'); }
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SendAsyncProvider.call(this, rpcSendAsync(url));
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}
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inherits(HttpProvider, SendAsyncProvider);
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utils.defineProperty(providers, 'HttpProvider', HttpProvider);
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function Web3Provider(provider) {
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if (!(this instanceof Web3Provider)) { throw new Error('missing new'); }
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if (provider.currentProvider) { provider = provider.currentProvider; }
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if (!provider.sendAsync) { throw new Error('invalid provider'); }
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SendAsyncProvider.call(this, provider);
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}
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inherits(Web3Provider, SendAsyncProvider);
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utils.defineProperty(providers, 'Web3Provider', Web3Provider);
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function base10ToBN(value) {
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return new utils.BN(value);
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}
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function hexToBN(value) {
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return new utils.BN(ensureHex(value).substring(2), 16);
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}
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function hexToNumber(value) {
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if (!utils.isHexString(value)) { throw new Error('invalid hex string'); }
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return parseInt(value.substring(2), 16);
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}
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function ensureHex(value) {
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if (!utils.isHexString(value)) { throw new Error('invalid hex string'); }
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return value;
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}
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function ensureTxid(value) {
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if (!utils.isHexString(value, 32)) { throw new Error('invalid hex string'); }
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return value;
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}
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function getGasPrice(value) {
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if (!value || !value.transactions || value.transactions.length === 0) {
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throw new Error('invalid response');
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}
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return hexToBN(value.transactions[0].gasPrice);
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}
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function EtherscanProvider(options) {
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if (!(this instanceof EtherscanProvider)) { throw new Error('missing new'); }
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if (!options) { options = {}; }
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var testnet = options.testnet;
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var apiKey = options.apiKey;
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utils.defineProperty(this, 'testnet', testnet);
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utils.defineProperty(this, 'apiKey', apiKey);
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utils.defineProperty(this, '_send', function(query, check) {
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var url = (testnet ? 'https://testnet.etherscan.io/api?': 'https://api.etherscan.io/api?');
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url += query;
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if (apiKey) { url += 'apikey=' + apiKey; }
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//console.log('URL', url);
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return new Promise(function(resolve, reject) {
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var request = new XMLHttpRequest();
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request.open('GET', url, true);
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request.onreadystatechange = function() {
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if (request.readyState !== 4) { return; }
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var result = request.responseText;
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//console.log(result);
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try {
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result = JSON.parse(result);
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if (result.message) {
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if (result.message === 'OK') {
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resolve(check(result.result));
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} else {
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reject(new Error('invalid response'));
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}
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} else {
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if (result.error) {
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console.log(result.error);
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reject(new Error('invalid response'));
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} else {
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resolve(check(result.result));
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}
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}
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} catch (error) {
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console.log(error);
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reject(new Error('invalid response'));
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}
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}
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try {
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request.send();
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} catch (error) {
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var connectionError = new Error('connection error');
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connectionError.error = error;
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reject(connectionError);
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}
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});
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});
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}
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utils.defineProperty(providers, 'EtherscanProvider', EtherscanProvider);
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utils.defineProperty(EtherscanProvider.prototype, 'getBalance', function(address, blockNumber) {
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address = SigningKey.getAddress(address);
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blockNumber = validBlock(blockNumber);
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var query = ('module=account&action=balance&address=' + address + '&tag=' + blockNumber);
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return this._send(query, base10ToBN);
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});
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utils.defineProperty(EtherscanProvider.prototype, 'getTransactionCount', function(address, blockNumber) {
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address = SigningKey.getAddress(address);
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blockNumber = validBlock(blockNumber);
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var query = ('module=proxy&action=eth_getTransactionCount&address=' + address + '&tag=' + blockNumber);
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return this._send(query, hexToNumber);
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});
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utils.defineProperty(EtherscanProvider.prototype, 'getGasPrice', function() {
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var query = ('module=proxy&action=eth_gasPrice');
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return this._send(query, hexToBN);
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});
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utils.defineProperty(EtherscanProvider.prototype, 'sendTransaction', function(signedTransaction) {
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if (!utils.isHexString(signedTransaction)) { throw new Error('invalid transaction'); }
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var query = ('module=proxy&action=eth_sendRawTransaction&hex=' + signedTransaction);
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return this._send(query, ensureTxid);
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});
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utils.defineProperty(EtherscanProvider.prototype, 'call', function(transaction) {
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var address = SigningKey.getAddress(transaction.to);
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var data = transaction.data;
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if (!utils.isHexString(data)) { throw new Error('invalid data'); }
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var query = ('module=proxy&action=eth_call&to=' + address + '&data=' + data);
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return this._send(query, ensureHex);
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});
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utils.defineProperty(EtherscanProvider.prototype, 'estimateGas', function(transaction) {
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var address = SigningKey.getAddress(transaction.to);
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var query = 'module=proxy&action=eth_estimateGas&to=' + address;
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if (transaction.gasPrice) {
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query += '&gasPrice=' + utils.hexlify(transaction.gasPrice);
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}
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if (transaction.gasLimit) {
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query += '&gas=' + utils.hexlify(transaction.gasLimit);
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}
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if (transaction.from) {
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query += '&from=' + SigningKey.getAddress(transaction.from);
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}
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if (transaction.data) {
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query += '&data=' + ensureHex(transaction.data);
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}
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if (transaction.value) {
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query += '&value=' + utils.hexlify(transaction.value);
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}
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return this._send(query, hexToBN);
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});
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utils.defineProperty(providers, 'isProvider', function(provider) {
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if (!provider) { return false; }
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for (var i = 0; i < methods; i++) {
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if (typeof(provider[methods[i]]) !== 'function') {
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return false;
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}
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}
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return true;
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});
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module.exports = providers;
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