bwc

js/models/RateService.js

@@ -1,171 +0,0 @@
-'use strict';
-
-var util = require('util');
-var _ = require('lodash');
-var log = require('../util/log');
-var preconditions = require('preconditions').singleton();
-var request = require('request');
-
-/*
-  This class lets interfaces with BitPay's exchange rate API.
-*/
-
-var RateService = function(opts) {
-  var self = this;
-
-  opts = opts || {};
-  self.request = opts.request || request;
-
-  self.SAT_TO_BTC = 1 / 1e8;
-  self.BTC_TO_SAT = 1e8;
-  self.UNAVAILABLE_ERROR = 'Service is not available - check for service.isAvailable() or use service.whenAvailable()';
-  self.UNSUPPORTED_CURRENCY_ERROR = 'Currency not supported';
-
-  self._url = opts.url || 'https://insight.bitpay.com:443/api/rates';
-
-  self._isAvailable = false;
-  self._rates = {};
-  self._alternatives = [];
-  self._queued = [];
-
-  self._fetchCurrencies();
-};
-
-var _instance;
-RateService.singleton = function(opts) {
-  if (!_instance) {
-    _instance = new RateService(opts);
-  }
-  return _instance;
-};
-
-
-RateService.prototype._fetchCurrencies = function() {
-  var self = this;
-
-  var backoffSeconds = 5;
-  var updateFrequencySeconds = 3600;
-  var rateServiceUrl = 'https://bitpay.com/api/rates';
-
-  var retrieve = function() {
-    log.info('Fetching exchange rates');
-    self.request.get({
-      url: rateServiceUrl,
-      json: true
-    }, function(err, res, body) {
-      if (err || !body) {
-        log.debug('Error fetching exchange rates', err);
-        setTimeout(function() {
-          backoffSeconds *= 1.5;
-          retrieve();
-        }, backoffSeconds * 1000);
-        return;
-      }
-      _.each(body, function(currency) {
-        self._rates[currency.code] = currency.rate;
-        self._alternatives.push({
-          name: currency.name,
-          isoCode: currency.code,
-          rate: currency.rate
-        });
-      });
-      self._isAvailable = true;
-      _.each(self._queued, function(callback) {
-        setTimeout(callback, 1);
-      });
-      setTimeout(retrieve, updateFrequencySeconds * 1000);
-    });
-  };
-
-  retrieve();
-};
-
-RateService.prototype.getRate = function(code) {
-  return this._rates[code];
-};
-
-RateService.prototype.getHistoricRate = function(code, date, cb) {
-  var self = this;
-
-  self.request.get({
-    url: self._url + '/' + code + '?ts=' + date,
-    json: true
-  }, function(err, res, body) {
-    if (err || res.statusCode != 200 || !body) return cb(err || res);
-    return cb(null, body.rate);
-  });
-};
-
-RateService.prototype.getHistoricRates = function(code, dates, cb) {
-  var self = this;
-
-  var tsList = dates.join(',');
-  self.request.get({
-    url: self._url + '/' + code + '?ts=' + tsList,
-    json: true
-  }, function(err, res, body) {
-    if (err || res.statusCode != 200 || !body) return cb(err || res);
-    if (!_.isArray(body)) {
-      body = [{
-        ts: dates[0],
-        rate: body.rate
-      }];
-    }
-    return cb(null, body);
-  });
-};
-
-RateService.prototype.getAlternatives = function() {
-  return this._alternatives;
-};
-
-RateService.prototype.isAvailable = function() {
-  return this._isAvailable;
-};
-
-RateService.prototype.whenAvailable = function(callback) {
-  if (this.isAvailable()) {
-    setTimeout(callback, 1);
-  } else {
-    this._queued.push(callback);
-  }
-};
-
-RateService.prototype.toFiat = function(satoshis, code) {
-  if (!this.isAvailable()) {
-    throw new Error(this.UNAVAILABLE_ERROR);
-  }
-  return satoshis * this.SAT_TO_BTC * this.getRate(code);
-};
-
-RateService.prototype.toFiatHistoric = function(satoshis, code, date, cb) {
-  var self = this;
-
-  self.getHistoricRate(code, date, function(err, rate) {
-    if (err) return cb(err);
-    return cb(null, satoshis * self.SAT_TO_BTC * rate);
-  });
-};
-
-RateService.prototype.fromFiat = function(amount, code) {
-  if (!this.isAvailable()) {
-    throw new Error(this.UNAVAILABLE_ERROR);
-  }
-  return amount / this.getRate(code) * this.BTC_TO_SAT;
-};
-
-RateService.prototype.listAlternatives = function() {
-  if (!this.isAvailable()) {
-    throw new Error(this.UNAVAILABLE_ERROR);
-  }
-
-  return _.map(this.getAlternatives(), function(item) {
-    return {
-      name: item.name,
-      isoCode: item.isoCode
-    }
-  });
-};
-
-
-module.exports = RateService;