69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
'use strict';
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var _ = require('lodash');
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var $ = require('preconditions').singleton();
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var log = require('npmlog');
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log.debug = log.verbose;
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var Explorers = require('bitcore-explorers');
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var request = require('request');
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var io = require('socket.io-client');
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function BlockChainExplorer(opts) {
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$.checkArgument(opts);
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var provider = opts.provider || 'insight';
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var network = opts.network || 'livenet';
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var dfltUrl = network == 'livenet' ? 'https://insight.bitpay.com:443' :
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'https://test-insight.bitpay.com:443';
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var url = opts.url || dfltUrl;
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var url;
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switch (provider) {
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case 'insight':
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var explorer = new Explorers.Insight(url, network);
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explorer.getTransactions = _.bind(getTransactionsInsight, explorer, url);
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explorer.getAddressActivity = _.bind(getAddressActivityInsight, explorer, url);
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explorer.initSocket = _.bind(initSocketInsight, explorer, url);
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return explorer;
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default:
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throw new Error('Provider ' + provider + ' not supported');
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};
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};
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function getTransactionsInsight(url, addresses, from, to, cb) {
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var qs = [];
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if (_.isNumber(from)) qs.push('from=' + from);
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if (_.isNumber(to)) qs.push('to=' + to);
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var url = url + '/api/addrs/txs' + (qs.length > 0 ? '?' + qs.join('&') : '');
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request({
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method: "POST",
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url: url,
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json: {
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addrs: [].concat(addresses).join(',')
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}
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}, function(err, res, txs) {
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if (err || res.statusCode != 200) return cb(err || res);
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// NOTE: Whenever Insight breaks communication with bitcoind, it returns invalid data but no error code.
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if (!_.isArray(txs) || (txs.length != _.compact(txs).length)) return cb(new Error('Could not retrieve transactions from blockchain'));
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return cb(null, txs);
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});
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};
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function getAddressActivityInsight(url, addresses, cb) {
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getTransactionsInsight(url, addresses, 0, 0, function(err, result) {
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if (err) return cb(err);
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return cb(null, result.totalItems > 0);
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});
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};
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function initSocketInsight(url) {
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var socket = io.connect(url, {});
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return socket;
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};
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module.exports = BlockChainExplorer;
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