query network version when metamask is back on line

app/scripts/controllers/network.js

@@ -11,6 +11,7 @@ const createEventEmitterProxy = require('../lib/events-proxy.js')
 const RPC_ADDRESS_LIST = require('../config.js').network
 const DEFAULT_RPC = RPC_ADDRESS_LIST['rinkeby']
 const INFURA_PROVIDER_TYPES = ['ropsten', 'rinkeby', 'kovan', 'mainnet']
+const noop = function () {}
 
 module.exports = class NetworkController extends EventEmitter {
 
@@ -58,15 +59,21 @@ module.exports = class NetworkController extends EventEmitter {
     return this.getNetworkState() === 'loading'
   }
 
-  lookupNetwork () {
+  lookupNetwork (cb = noop){
     // Prevent firing when provider is not defined.
     if (!this.ethQuery || !this.ethQuery.sendAsync) {
       return log.warn('NetworkController - lookupNetwork aborted due to missing ethQuery')
     }
     this.ethQuery.sendAsync({ method: 'net_version' }, (err, network) => {
-      if (err) return this.setNetworkState('loading')
+      if (err) {
+        this.setNetworkState('loading')
+        console.error(err)
+        cb(err)
+        return
+      }
       log.info('web3.getNetwork returned ' + network)
       this.setNetworkState(network)
+      cb(null, network)
     })
   }
 

app/scripts/metamask-controller.js

@@ -61,6 +61,21 @@ module.exports = class MetamaskController extends EventEmitter {
     // network store
     this.networkController = new NetworkController(initState.NetworkController)
 
+    // setup onLine lister for restarting the provider
+    if (this.platform.addOnLineListener) {
+      this.platform.addOnLineListener(() => {
+        // guard against premature firring of the event listener
+        if (this.provider) {
+          // start the block tracker up
+          this.provider.stop()
+          this.provider.start()
+        }
+        // look up the network
+        this.networkController.lookupNetwork(() => {
+          this.sendUpdate()
+        })
+      })
+    }
     // config manager
     this.configManager = new ConfigManager({
       store: this.store,
@@ -91,6 +106,7 @@ module.exports = class MetamaskController extends EventEmitter {
 
     // rpc provider
     this.provider = this.initializeProvider()
+
     this.blockTracker = this.provider._blockTracker
 
     this.recentBlocksController = new RecentBlocksController({

app/scripts/platforms/extension.js

@@ -26,6 +26,14 @@ class ExtensionPlatform {
       cb(e)
     }
   }
+
+  isOnline () {
+    return navigator.onLine
+  }
+
+  addOnLineListener (cb) {
+    window.addEventListener('online', cb)
+  }
 }
 
 module.exports = ExtensionPlatform