Merge pull request #4144 from MetaMask/ui-actions-pify-importNewAccount

ui - actions - importNewAccount - use async and pify for cleaner syntax

ui/app/actions.js

@@ -1,4 +1,5 @@
 const abi = require('human-standard-token-abi')
+const pify = require('pify')
 const getBuyEthUrl = require('../../app/scripts/lib/buy-eth-url')
 const { getTokenAddressFromTokenObject } = require('./util')
 const ethUtil = require('ethereumjs-util')
@@ -523,31 +524,26 @@ function addNewKeyring (type, opts) {
 }
 
 function importNewAccount (strategy, args) {
-  return (dispatch) => {
+  return async (dispatch) => {
-    dispatch(actions.showLoadingIndication('This may take a while, be patient.'))
+    let newState
+    dispatch(actions.showLoadingIndication('This may take a while, please be patient.'))
+    try {
       log.debug(`background.importAccountWithStrategy`)
-    return new Promise((resolve, reject) => {
+      await pify(background.importAccountWithStrategy).call(background, strategy, args)
-      background.importAccountWithStrategy(strategy, args, (err) => {
-        if (err) {
-          dispatch(actions.displayWarning(err.message))
-          return reject(err)
-        }
       log.debug(`background.getState`)
-        background.getState((err, newState) => {
+      newState = await pify(background.getState).call(background)
+    } catch (err) {
       dispatch(actions.hideLoadingIndication())
-          if (err) {
       dispatch(actions.displayWarning(err.message))
-            return reject(err)
+      return
     }
+    dispatch(actions.hideLoadingIndication())
     dispatch(actions.updateMetamaskState(newState))
     dispatch({
       type: actions.SHOW_ACCOUNT_DETAIL,
       value: newState.selectedAddress,
     })
-          resolve(newState)
+    return newState
-        })
-      })
-    })
   }
 }