2 files changed, 34 insertions, 1 deletions
diff --git a/app/scripts/lib/account-tracker.js b/app/scripts/lib/account-tracker.js
index e2892b1ce..07fc32b10 100644
--- a/app/scripts/lib/account-tracker.js
+++ b/app/scripts/lib/account-tracker.js
@@ -11,6 +11,7 @@ const async = require('async')
 const EthQuery = require('eth-query')
 const ObservableStore = require('obs-store')
 const EventEmitter = require('events').EventEmitter
+const ethUtil = require('ethereumjs-util')
 function noop () {}
 
 
@@ -59,8 +60,9 @@ class AccountTracker extends EventEmitter {
   _updateForBlock (block) {
     const blockNumber = '0x' + block.number.toString('hex')
     this._currentBlockNumber = blockNumber
+    const currentBlockGasLimit = ethUtil.addHexPrefix(block.gasLimit.toString())
 
-    this.store.updateState({ currentBlockGasLimit: `0x${block.gasLimit.toString('hex')}` })
+    this.store.updateState({ currentBlockGasLimit })
 
     async.parallel([
       this._updateAccounts.bind(this),
diff --git a/app/scripts/lib/events-proxy.js b/app/scripts/lib/events-proxy.js
new file mode 100644
index 000000000..d1199a278
--- /dev/null
+++ b/app/scripts/lib/events-proxy.js
@@ -0,0 +1,31 @@
+module.exports = function createEventEmitterProxy(eventEmitter, listeners) {
+  let target = eventEmitter
+  const eventHandlers = listeners || {}
+  const proxy = new Proxy({}, {
+    get: (obj, name) => {
+      // intercept listeners
+      if (name === 'on') return addListener
+      if (name === 'setTarget') return setTarget
+      if (name === 'proxyEventHandlers') return eventHandlers
+      return target[name]
+    },
+    set: (obj, name, value) => {
+      target[name] = value
+      return true
+    },
+  })
+  function setTarget (eventEmitter) {
+    target = eventEmitter
+    // migrate listeners
+    Object.keys(eventHandlers).forEach((name) => {
+      eventHandlers[name].forEach((handler) => target.on(name, handler))
+    })
+  }
+  function addListener (name, handler) {
+    if (!eventHandlers[name]) eventHandlers[name] = []
+    eventHandlers[name].push(handler)
+    target.on(name, handler)
+  }
+  if (listeners) proxy.setTarget(eventEmitter)
+  return proxy
+}
+\ No newline at end of file