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Diffstat (limited to 'app/scripts/controllers/currency.js')
| -rw-r--r-- | app/scripts/controllers/currency.js | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/app/scripts/controllers/currency.js b/app/scripts/controllers/currency.js deleted file mode 100644 index fce65fd9c..000000000 --- a/app/scripts/controllers/currency.js +++ /dev/null @@ -1,205 +0,0 @@ -const ObservableStore = require('obs-store') -const extend = require('xtend') -const log = require('loglevel') - -// every ten minutes -const POLLING_INTERVAL = 600000 - -class CurrencyController { - - /** - * Controller responsible for managing data associated with the currently selected currency. - * - * @typedef {Object} CurrencyController - * @param {object} opts Overrides the defaults for the initial state of this.store - * @property {array} opts.initState initializes the the state of the CurrencyController. Can contain an - * currentCurrency, conversionRate and conversionDate properties - * @property {string} currentCurrency A 2-4 character shorthand that describes a specific currency, currently - * selected by the user - * @property {number} conversionRate The conversion rate from ETH to the selected currency. - * @property {string} conversionDate The date at which the conversion rate was set. Expressed in in milliseconds - * since midnight of January 1, 1970 - * @property {number} conversionInterval The id of the interval created by the scheduleConversionInterval method. - * Used to clear an existing interval on subsequent calls of that method. - * @property {string} nativeCurrency The ticker/symbol of the native chain currency - * - */ - constructor (opts = {}) { - const initState = extend({ - currentCurrency: 'usd', - conversionRate: 0, - conversionDate: 'N/A', - nativeCurrency: 'ETH', - }, opts.initState) - this.store = new ObservableStore(initState) - } - - // - // PUBLIC METHODS - // - - /** - * A getter for the nativeCurrency property - * - * @returns {string} A 2-4 character shorthand that describes the specific currency - * - */ - getNativeCurrency () { - return this.store.getState().nativeCurrency - } - - /** - * A setter for the nativeCurrency property - * - * @param {string} nativeCurrency The new currency to set as the nativeCurrency in the store - * - */ - setNativeCurrency (nativeCurrency) { - this.store.updateState({ - nativeCurrency, - ticker: nativeCurrency, - }) - } - - /** - * A getter for the currentCurrency property - * - * @returns {string} A 2-4 character shorthand that describes a specific currency, currently selected by the user - * - */ - getCurrentCurrency () { - return this.store.getState().currentCurrency - } - - /** - * A setter for the currentCurrency property - * - * @param {string} currentCurrency The new currency to set as the currentCurrency in the store - * - */ - setCurrentCurrency (currentCurrency) { - this.store.updateState({ currentCurrency }) - } - - /** - * A getter for the conversionRate property - * - * @returns {string} The conversion rate from ETH to the selected currency. - * - */ - getConversionRate () { - return this.store.getState().conversionRate - } - - /** - * A setter for the conversionRate property - * - * @param {number} conversionRate The new rate to set as the conversionRate in the store - * - */ - setConversionRate (conversionRate) { - this.store.updateState({ conversionRate }) - } - - /** - * A getter for the conversionDate property - * - * @returns {string} The date at which the conversion rate was set. Expressed in milliseconds since midnight of - * January 1, 1970 - * - */ - getConversionDate () { - return this.store.getState().conversionDate - } - - /** - * A setter for the conversionDate property - * - * @param {number} conversionDate The date, expressed in milliseconds since midnight of January 1, 1970, that the - * conversionRate was set - * - */ - setConversionDate (conversionDate) { - this.store.updateState({ conversionDate }) - } - - /** - * Updates the conversionRate and conversionDate properties associated with the currentCurrency. Updated info is - * fetched from an external API - * - */ - async updateConversionRate () { - let currentCurrency, nativeCurrency - try { - currentCurrency = this.getCurrentCurrency() - nativeCurrency = this.getNativeCurrency() - // select api - let apiUrl - if (nativeCurrency === 'ETH') { - // ETH - apiUrl = `https://api.infura.io/v1/ticker/eth${currentCurrency.toLowerCase()}` - } else { - // ETC - apiUrl = `https://min-api.cryptocompare.com/data/price?fsym=${nativeCurrency.toUpperCase()}&tsyms=${currentCurrency.toUpperCase()}` - } - // attempt request - let response - try { - response = await fetch(apiUrl) - } catch (err) { - log.error(new Error(`CurrencyController - Failed to request currency from Infura:\n${err.stack}`)) - return - } - // parse response - let rawResponse - let parsedResponse - try { - rawResponse = await response.text() - parsedResponse = JSON.parse(rawResponse) - } catch (err) { - log.error(new Error(`CurrencyController - Failed to parse response "${rawResponse}"`)) - return - } - // set conversion rate - if (nativeCurrency === 'ETH') { - // ETH - this.setConversionRate(Number(parsedResponse.bid)) - this.setConversionDate(Number(parsedResponse.timestamp)) - } else { - // ETC - if (parsedResponse[currentCurrency.toUpperCase()]) { - this.setConversionRate(Number(parsedResponse[currentCurrency.toUpperCase()])) - this.setConversionDate(parseInt((new Date()).getTime() / 1000)) - } else { - this.setConversionRate(0) - this.setConversionDate('N/A') - } - } - } catch (err) { - // reset current conversion rate - log.warn(`MetaMask - Failed to query currency conversion:`, nativeCurrency, currentCurrency, err) - this.setConversionRate(0) - this.setConversionDate('N/A') - // throw error - log.error(new Error(`CurrencyController - Failed to query rate for currency "${currentCurrency}":\n${err.stack}`)) - return - } - } - - /** - * Creates a new poll, using setInterval, to periodically call updateConversionRate. The id of the interval is - * stored at the controller's conversionInterval property. If it is called and such an id already exists, the - * previous interval is clear and a new one is created. - * - */ - scheduleConversionInterval () { - if (this.conversionInterval) { - clearInterval(this.conversionInterval) - } - this.conversionInterval = setInterval(() => { - this.updateConversionRate() - }, POLLING_INTERVAL) - } -} - -module.exports = CurrencyController |