Merge pull request #1 from MetaMask/master

Merge from the source

1 files changed, 14 insertions, 3 deletions

diff --git a/app/scripts/inpage.js b/app/scripts/inpage.js
index 9e98c044b..9261e7d64 100644
--- a/app/scripts/inpage.js
+++ b/app/scripts/inpage.js
@@ -1,6 +1,7 @@
 /*global Web3*/
 cleanContextForImports()
 require('web3/dist/web3.min.js')
+const log = require('loglevel')
 const LocalMessageDuplexStream = require('post-message-stream')
 // const PingStream = require('ping-pong-stream/ping')
 // const endOfStream = require('end-of-stream')
@@ -8,6 +9,10 @@ const setupDappAutoReload = require('./lib/auto-reload.js')
 const MetamaskInpageProvider = require('./lib/inpage-provider.js')
 restoreContextAfterImports()
 
+const METAMASK_DEBUG = 'GULP_METAMASK_DEBUG'
+window.log = log
+log.setDefaultLevel(METAMASK_DEBUG ? 'debug' : 'warn')
+
 
 //
 // setup plugin communication
@@ -26,11 +31,18 @@ var inpageProvider = new MetamaskInpageProvider(metamaskStream)
 // setup web3
 //
 
+if (typeof window.web3 !== 'undefined') {
+  throw new Error(`MetaMask detected another web3.
+     MetaMask will not work reliably with another web3 extension.
+     This usually happens if you have two MetaMasks installed,
+     or MetaMask and another web3 extension. Please remove one
+     and try again.`)
+}
 var web3 = new Web3(inpageProvider)
 web3.setProvider = function () {
-  console.log('MetaMask - overrode web3.setProvider')
+  log.debug('MetaMask - overrode web3.setProvider')
 }
-console.log('MetaMask - injected web3')
+log.debug('MetaMask - injected web3')
 // export global web3, with usage-detection
 setupDappAutoReload(web3, inpageProvider.publicConfigStore)
 
@@ -65,4 +77,3 @@ function restoreContextAfterImports () {
     console.warn('MetaMask - global.define could not be overwritten.')
   }
 }
-