Save recent network balances in local storage (#5843)

* Use selector for state.metamask.accounts in all cases.

* Default to cached balance when selecting metamask accounts

* Adds the cached-balances controller

* Documentation and small codes fixes for #5843

Co-Authored-By: danjm <danjm.com@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 7d6f06f92..fe806e47e 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -29,6 +29,7 @@ const ShapeShiftController = require('./controllers/shapeshift')
 const AddressBookController = require('./controllers/address-book')
 const InfuraController = require('./controllers/infura')
 const BlacklistController = require('./controllers/blacklist')
+const CachedBalancesController = require('./controllers/cached-balances')
 const RecentBlocksController = require('./controllers/recent-blocks')
 const MessageManager = require('./lib/message-manager')
 const PersonalMessageManager = require('./lib/personal-message-manager')
@@ -142,6 +143,12 @@ module.exports = class MetamaskController extends EventEmitter {
       }
     })
 
+    this.cachedBalancesController = new CachedBalancesController({
+      accountTracker: this.accountTracker,
+      getNetwork: this.networkController.getNetworkState.bind(this.networkController),
+      initState: initState.CachedBalancesController,
+    })
+
     // ensure accountTracker updates balances after network change
     this.networkController.on('networkDidChange', () => {
       this.accountTracker._updateAccounts()
@@ -241,6 +248,7 @@ module.exports = class MetamaskController extends EventEmitter {
       ShapeShiftController: this.shapeshiftController.store,
       NetworkController: this.networkController.store,
       InfuraController: this.infuraController.store,
+      CachedBalancesController: this.cachedBalancesController.store,
     })
 
     this.memStore = new ComposableObservableStore(null, {
@@ -248,6 +256,7 @@ module.exports = class MetamaskController extends EventEmitter {
       AccountTracker: this.accountTracker.store,
       TxController: this.txController.memStore,
       BalancesController: this.balancesController.store,
+      CachedBalancesController: this.cachedBalancesController.store,
       TokenRatesController: this.tokenRatesController.store,
       MessageManager: this.messageManager.memStore,
       PersonalMessageManager: this.personalMessageManager.memStore,