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- <h1 class="page-title">controllers/token-rates.js</h1>
-
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-
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-
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- <section>
- <article>
- <pre class="prettyprint source linenums"><code>const ObservableStore = require('obs-store')
-
-// By default, poll every 3 minutes
-const DEFAULT_INTERVAL = 180 * 1000
-
-/**
- * A controller that polls for token exchange
- * rates based on a user's current token list
- */
-class TokenRatesController {
- /**
- * Creates a TokenRatesController
- *
- * @param {Object} [config] - Options to configure controller
- */
- constructor ({ interval = DEFAULT_INTERVAL, preferences } = {}) {
- this.store = new ObservableStore()
- this.preferences = preferences
- this.interval = interval
- }
-
- /**
- * Updates exchange rates for all tokens
- */
- async updateExchangeRates () {
- if (!this.isActive) { return }
- const contractExchangeRates = {}
- for (const i in this._tokens) {
- const address = this._tokens[i].address
- contractExchangeRates[address] = await this.fetchExchangeRate(address)
- }
- this.store.putState({ contractExchangeRates })
- }
-
- /**
- * Fetches a token exchange rate by address
- *
- * @param {String} address - Token contract address
- */
- async fetchExchangeRate (address) {
- try {
- const response = await fetch(`https://exchanges.balanc3.net/prices?from=${address}&amp;to=ETH&amp;autoConversion=false&amp;summaryOnly=true`)
- const json = await response.json()
- return json &amp;&amp; json.length ? json[0].averagePrice : 0
- } catch (error) { }
- }
-
- /**
- * @type {Number}
- */
- set interval (interval) {
- this._handle &amp;&amp; clearInterval(this._handle)
- if (!interval) { return }
- this._handle = setInterval(() => { this.updateExchangeRates() }, interval)
- }
-
- /**
- * @type {Object}
- */
- set preferences (preferences) {
- this._preferences &amp;&amp; this._preferences.unsubscribe()
- if (!preferences) { return }
- this._preferences = preferences
- this.tokens = preferences.getState().tokens
- preferences.subscribe(({ tokens = [] }) => { this.tokens = tokens })
- }
-
- /**
- * @type {Array}
- */
- set tokens (tokens) {
- this._tokens = tokens
- this.updateExchangeRates()
- }
-}
-
-module.exports = TokenRatesController
-</code></pre>
- </article>
- </section>
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