Move obs store into account-tracker instead of inheriting

app/scripts/controllers/balance.js

@@ -36,12 +36,12 @@ class BalanceController {
     this.txController.on('submitted', update)
     this.txController.on('confirmed', update)
     this.txController.on('failed', update)
-    this.accountTracker.subscribe(update)
+    this.accountTracker.store.subscribe(update)
     this.blockTracker.on('block', update)
   }
 
   async _getBalance () {
-    const { accounts } = this.accountTracker.getState()
+    const { accounts } = this.accountTracker.store.getState()
     const entry = accounts[this.address]
     const balance = entry.balance
     return balance ? new BN(balance.substring(2), 16) : undefined

app/scripts/controllers/computed-balances.js

@@ -20,15 +20,15 @@ class ComputedbalancesController {
   }
 
   updateAllBalances () {
-    for (let address in this.balances) {
+    for (let address in this.accountTracker.store.getState().accounts) {
       this.balances[address].updateBalance()
     }
   }
 
   _initBalanceUpdating () {
-    const store = this.accountTracker.getState()
+    const store = this.accountTracker.store.getState()
     this.addAnyAccountsFromStore(store)
-    this.accountTracker.subscribe(this.addAnyAccountsFromStore.bind(this))
+    this.accountTracker.store.subscribe(this.addAnyAccountsFromStore.bind(this))
   }
 
   addAnyAccountsFromStore(store) {

app/scripts/lib/account-tracker.js

@@ -10,16 +10,21 @@
 const async = require('async')
 const EthQuery = require('eth-query')
 const ObservableStore = require('obs-store')
+const EventEmitter = require('events').EventEmitter
 function noop () {}
 
 
-class EthereumStore extends ObservableStore {
+class AccountTracker extends EventEmitter {
 
   constructor (opts = {}) {
-    super({
+    super()
+
+    const initState = {
       accounts: {},
       currentBlockGasLimit: '',
-    })
+    }
+    this.store = new ObservableStore(initState)
+
     this._provider = opts.provider
     this._query = new EthQuery(this._provider)
     this._blockTracker = opts.blockTracker
@@ -34,17 +39,17 @@ class EthereumStore extends ObservableStore {
   //
 
   addAccount (address) {
-    const accounts = this.getState().accounts
+    const accounts = this.store.getState().accounts
     accounts[address] = {}
-    this.updateState({ accounts })
+    this.store.updateState({ accounts })
     if (!this._currentBlockNumber) return
     this._updateAccount(address)
   }
 
   removeAccount (address) {
-    const accounts = this.getState().accounts
+    const accounts = this.store.getState().accounts
     delete accounts[address]
-    this.updateState({ accounts })
+    this.store.updateState({ accounts })
   }
 
   //
@@ -55,31 +60,31 @@ class EthereumStore extends ObservableStore {
     const blockNumber = '0x' + block.number.toString('hex')
     this._currentBlockNumber = blockNumber
 
-    this.updateState({ currentBlockGasLimit: `0x${block.gasLimit.toString('hex')}` })
+    this.store.updateState({ currentBlockGasLimit: `0x${block.gasLimit.toString('hex')}` })
 
     async.parallel([
       this._updateAccounts.bind(this),
     ], (err) => {
       if (err) return console.error(err)
-      this.emit('block', this.getState())
+      this.emit('block', this.store.getState())
     })
   }
 
   _updateAccounts (cb = noop) {
-    const accounts = this.getState().accounts
+    const accounts = this.store.getState().accounts
     const addresses = Object.keys(accounts)
     async.each(addresses, this._updateAccount.bind(this), cb)
   }
 
   _updateAccount (address, cb = noop) {
-    const accounts = this.getState().accounts
     this._getAccount(address, (err, result) => {
       if (err) return cb(err)
       result.address = address
+      const accounts = this.store.getState().accounts
       // only populate if the entry is still present
       if (accounts[address]) {
         accounts[address] = result
-        this.updateState({ accounts })
+        this.store.updateState({ accounts })
       }
       cb(null, result)
     })
@@ -96,4 +101,4 @@ class EthereumStore extends ObservableStore {
 
 }
 
-module.exports = EthereumStore
+module.exports = AccountTracker

app/scripts/metamask-controller.js

@@ -194,7 +194,7 @@ module.exports = class MetamaskController extends EventEmitter {
 
     // manual mem state subscriptions
     this.networkController.store.subscribe(this.sendUpdate.bind(this))
-    this.accountTracker.subscribe(this.sendUpdate.bind(this))
+    this.accountTracker.store.subscribe(this.sendUpdate.bind(this))
     this.txController.memStore.subscribe(this.sendUpdate.bind(this))
     this.balancesController.store.subscribe(this.sendUpdate.bind(this))
     this.messageManager.memStore.subscribe(this.sendUpdate.bind(this))
@@ -277,7 +277,7 @@ module.exports = class MetamaskController extends EventEmitter {
         isInitialized,
       },
       this.networkController.store.getState(),
-      this.accountTracker.getState(),
+      this.accountTracker.store.getState(),
       this.txController.memStore.getState(),
       this.messageManager.memStore.getState(),
       this.personalMessageManager.memStore.getState(),