131 lines
4.1 KiB
JavaScript
131 lines
4.1 KiB
JavaScript
'use strict';
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var utils = require('./utils.js');
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var XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;
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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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//console.log('mm', 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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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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callback(new Error('invalid response'));
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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 Provider(provider) {
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if (!(this instanceof Provider)) { throw new Error('missing new'); }
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var client = null;
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if (typeof(provider) === 'string') {
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// An RPC URL
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if (provider.substring(0, 7) === 'http://') {
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client = new Web3Connector(rpcSendAsync(provider));
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// An ethers.io URL
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} else if (provider.substring(0, 5) === 'ws://' || provider.substirng(0, 6) === 'wss://') {
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//client =
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// Etherscan
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} else if (string === 'testnet.etherscan.io' || string === 'etherscan.io') {
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// client =
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}
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// A Web3 Instance
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} else if (provider.currentProvider && provider.currentProvider.sendAsync) {
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client = new Web3Connector(provider.currentProvider);
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// A Web3 Provider
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} else if (provider.sendAsync) {
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client = new Web3Connector(provider);
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}
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if (!client) { throw new Error('invalid connector'); }
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utils.defineProperty(this, 'client', client);
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}
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utils.defineProperty(Provider.prototype, 'getBalance', function(address, blockNumber) {
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if (blockNumber == null) { blockNumber = 'latest'; }
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return this.client.sendMessage('eth_getBalance', [address, blockNumber]);
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});
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utils.defineProperty(Provider.prototype, 'getTransactionCount', function(address, blockNumber) {
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if (blockNumber == null) { blockNumber = 'latest'; }
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return this.client.sendMessage('eth_getTransactionCount', [address, blockNumber]);
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});
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utils.defineProperty(Provider.prototype, 'getGasPrice', function() {
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return this.client.sendMessage('eth_gasPrice', []);
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});
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utils.defineProperty(Provider.prototype, 'sendTransaction', function(signedTransaction) {
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return this.client.sendMessage('eth_sendRawTransaction', [signedTransaction]);
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});
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utils.defineProperty(Provider.prototype, 'call', function(transaction) {
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return this.client.sendMessage('eth_call', [transaction]);
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});
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utils.defineProperty(Provider.prototype, 'estimateGas', function(transaction) {
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return this.client.sendMessage('eth_estimateGas', [transaction]);
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});
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module.exports = Provider;
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