114 lines
2.8 KiB
JavaScript
114 lines
2.8 KiB
JavaScript
'use strict';
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angular.module('copayApp.services').factory('rateService', function($http, lodash) {
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var SAT_TO_BTC = 1 / 1e8;
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var BTC_TO_SAT = 1e8;
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var UNAVAILABLE_ERROR = 'Service is not available - check for service.isAvailable() or use service.whenAvailable()';
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var UNSUPPORTED_CURRENCY_ERROR = 'Currency not supported';
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var _isAvailable = false;
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var _rates = {};
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var _alternatives = [];
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var _bchRate = null;
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var _queued = [];
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var root = {};
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root.updateRates = function() {
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var backoffSeconds = 5;
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var rateServiceUrl = 'https://www.bitcoin.com/special/rates.json';
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function getRates(cb, tries) {
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tries = tries || 0;
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if (tries > 5) return cb('could not get rates');
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$http.get(rateServiceUrl).success(function(res) {
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lodash.each(res, function(currency) {
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_rates[currency.code] = currency.rate;
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_alternatives.push({
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name: currency.name,
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isoCode: currency.code,
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rate: currency.rate
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});
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if (currency.code == 'BCH') {
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_bchRate = currency.rate;
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}
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});
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return cb();
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}).error(function() {
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setTimeout(function() {
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backoffSeconds *= 1.5;
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getRates(cb, tries++)
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}, backoffSeconds * 1000)
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return;
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});
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}
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getRates(function(err) {
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if (err) return;
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_isAvailable = true;
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lodash.each(_queued, function(callback) {
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setTimeout(callback, 1);
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});
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});
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}
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root.getRate = function(code, chain) {
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var rate = _rates[code];
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return chain == 'bch' ? _bchRate * rate : rate;
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}
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root.getAlternatives = function() {
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return _alternatives;
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}
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root.isAvailable = function() {
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return _isAvailable;
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}
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root.whenAvailable = function(callback) {
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if (root.isAvailable()) {
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setTimeout(callback, 10);
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} else {
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_queued.push(callback);
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}
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}
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root.toFiat = function(satoshis, code, chain) {
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if (!root.isAvailable()) {
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return null;
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}
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return satoshis * SAT_TO_BTC * root.getRate(code, chain);
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}
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root.fromFiat = function(amount, code, chain) {
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if (!root.isAvailable()) {
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return null;
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}
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return amount / root.getRate(code, chain) * BTC_TO_SAT;
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};
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root.listAlternatives = function(sort) {
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if (!root.isAvailable()) {
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return [];
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}
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var alternatives = lodash.map(root.getAlternatives(), function(item) {
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return {
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name: item.name,
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isoCode: item.isoCode
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}
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});
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if (sort) {
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alternatives.sort(function(a, b) {
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return a.name.toLowerCase() > b.name.toLowerCase() ? 1 : -1;
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});
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}
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return lodash.uniq(alternatives, 'isoCode');
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};
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root.updateRates();
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setInterval(root.updateRates, 5 * 60 * 1000);
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return root;
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});
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