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147 lines
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<h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="ComposableObservableStore.html">ComposableObservableStore</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="ComposableObservableStore.html#getFlatState">getFlatState</a></li><li data-type='method'><a href="ComposableObservableStore.html#updateStructure">updateStructure</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="EdgeEncryptor.html">EdgeEncryptor</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="EdgeEncryptor.html#decrypt">decrypt</a></li><li data-type='method'><a href="EdgeEncryptor.html#encrypt">encrypt</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="dropdown icon"></i><a href="TokenRatesController.html">TokenRatesController</a></div></div></div><div class="content"><ul class='methods'><li data-type='method'><a href="TokenRatesController.html#fetchExchangeRate">fetchExchangeRate</a></li><li data-type='method'><a href="TokenRatesController.html#updateExchangeRates">updateExchangeRates</a></li></ul></div></li></div><div class="ui vertical accordion"><div class="title"><div class="ui list"><div class="item"><i class="inverted dropdown icon"></i><a href="module.exports_module.exports.html">exports</a></div></div></div></li></div></ul><h3>Global</h3><ul><li><a href="global.html#blacklistedDomainCheck">blacklistedDomainCheck</a></li><li><a href="global.html#cleanContextForImports">cleanContextForImports</a></li><li><a href="global.html#config">config</a></li><li><a href="global.html#connectToAccountManager">connectToAccountManager</a></li><li><a href="global.html#doctypeCheck">doctypeCheck</a></li><li><a href="global.html#documentElementCheck">documentElementCheck</a></li><li><a href="global.html#initializePopup">initializePopup</a></li><li><a href="global.html#initialState">initialState</a></li><li><a href="global.html#logStreamDisconnectWarning">logStreamDisconnectWarning</a></li><li><a href="global.html#redirectToPhishingWarning">redirectToPhishingWarning</a></li><li><a href="global.html#restoreContextAfterImports">restoreContextAfterImports</a></li><li><a href="global.html#setupControllerConnection">setupControllerConnection</a></li><li><a href="global.html#setupInjection">setupInjection</a></li><li><a href="global.html#setupStreams">setupStreams</a></li><li><a href="global.html#setupWeb3Connection">setupWeb3Connection</a></li><li><a href="global.html#shouldInjectWeb3">shouldInjectWeb3</a></li><li><a href="global.html#suffixCheck">suffixCheck</a></li></ul>
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<h1 class="page-title">controllers/token-rates.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>const ObservableStore = require('obs-store')
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// By default, poll every 3 minutes
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const DEFAULT_INTERVAL = 180 * 1000
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/**
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* A controller that polls for token exchange
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* rates based on a user's current token list
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*/
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class TokenRatesController {
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/**
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* Creates a TokenRatesController
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*
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* @param {Object} [config] - Options to configure controller
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*/
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constructor ({ interval = DEFAULT_INTERVAL, preferences } = {}) {
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this.store = new ObservableStore()
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this.preferences = preferences
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this.interval = interval
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}
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/**
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* Updates exchange rates for all tokens
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*/
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async updateExchangeRates () {
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if (!this.isActive) { return }
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const contractExchangeRates = {}
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for (const i in this._tokens) {
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const address = this._tokens[i].address
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contractExchangeRates[address] = await this.fetchExchangeRate(address)
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}
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this.store.putState({ contractExchangeRates })
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}
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/**
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* Fetches a token exchange rate by address
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*
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* @param {String} address - Token contract address
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*/
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async fetchExchangeRate (address) {
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try {
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const response = await fetch(`https://exchanges.balanc3.net/prices?from=${address}&to=ETH&autoConversion=false&summaryOnly=true`)
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const json = await response.json()
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return json && json.length ? json[0].averagePrice : 0
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} catch (error) { }
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}
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/**
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* @type {Number}
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*/
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set interval (interval) {
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this._handle && clearInterval(this._handle)
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if (!interval) { return }
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this._handle = setInterval(() => { this.updateExchangeRates() }, interval)
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}
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/**
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* @type {Object}
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*/
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set preferences (preferences) {
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this._preferences && this._preferences.unsubscribe()
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if (!preferences) { return }
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this._preferences = preferences
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this.tokens = preferences.getState().tokens
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preferences.subscribe(({ tokens = [] }) => { this.tokens = tokens })
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}
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/**
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* @type {Array}
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*/
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set tokens (tokens) {
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this._tokens = tokens
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this.updateExchangeRates()
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}
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}
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module.exports = TokenRatesController
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</code></pre>
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</article>
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</section>
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Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a> on Wed Apr 18 2018 17:21:38 GMT-0400 (EDT) using the radgrad jsdoc theme. Derived from docdash.
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