feature: integrate gaba/CurrencyRateController (#6570)

2 files changed, 1 insertions, 206 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${err.stack}`))
-      return
-    }
-  }
-
-  /**
-   * Creates a new poll, using setInterval, to periodically call updateConversionRate. The id of the interval is
-   * stored at the controller's conversionInterval property. If it is called and such an id already exists, the
-   * previous interval is clear and a new one is created.
-   *
-   */
-  scheduleConversionInterval () {
-    if (this.conversionInterval) {
-      clearInterval(this.conversionInterval)
-    }
-    this.conversionInterval = setInterval(() => {
-      this.updateConversionRate()
-    }, POLLING_INTERVAL)
-  }
-}
-
-module.exports = CurrencyController
diff --git a/app/scripts/controllers/token-rates.js b/app/scripts/controllers/token-rates.js
index 6b6265dba..9b86a9ebf 100644
--- a/app/scripts/controllers/token-rates.js
+++ b/app/scripts/controllers/token-rates.js
@@ -30,7 +30,7 @@ class TokenRatesController {
   async updateExchangeRates () {
     if (!this.isActive) { return }
     const contractExchangeRates = {}
-    const nativeCurrency = this.currency ? this.currency.getState().nativeCurrency.toLowerCase() : 'eth'
+    const nativeCurrency = this.currency ? this.currency.state.nativeCurrency.toLowerCase() : 'eth'
     const pairs = this._tokens.map(token => token.address).join(',')
     const query = `contract_addresses=${pairs}&vs_currencies=${nativeCurrency}`
     if (this._tokens.length > 0) {