Begin adding unconfigured notifier

app/scripts/controllers/preferences.js

@@ -1,6 +1,8 @@
 const ObservableStore = require('obs-store')
 const normalizeAddress = require('eth-sig-util').normalize
 const extend = require('xtend')
+const BugNotifier = require('../lib/bug-notifier')
+const notifier = new BugNotifier()
 
 class PreferencesController {
 
@@ -30,6 +32,7 @@ class PreferencesController {
       identities: {},
       lostIdentities: {},
     }, opts.initState)
+
     this.store = new ObservableStore(initState)
   }
 // PUBLIC METHODS
@@ -108,16 +111,26 @@ class PreferencesController {
    */
   syncAddresses (addresses) {
     let { identities, lostIdentities } = this.store.getState()
-
     Object.keys(identities).forEach((identity) => {
       if (!addresses.includes(identity)) {
         delete identities[identity]
         lostIdentities[identity] = identities[identity]
+      }
+    })
 
-        // TODO: Report the bug to Sentry including the now-lost identity.
+    // Identities are no longer present.
+    if (Object.keys(lostIdentities).length > 0) {
+
+      // timeout to prevent blocking the thread:
+      setTimeout(() => {
         alert('Error 4486: MetaMask has encountered a very strange error. Please open a support issue immediately at support@metamask.io.')
+      }, 10)
+
+      // Notify our servers:
+      const uri =
+      notifier.notify(uri, { accounts: Object.keys(lostIdentities) })
+      .catch(log.error)
     }
-    })
 
     this.store.updateState({ identities, lostIdentities })
     this.addAddresses(addresses)

app/scripts/lib/bug-notifier.js

@@ -1,26 +1,21 @@
 class BugNotifier {
-  notify (message) {
-
-    postData('http://example.com/answer', {answer: 42})
+  notify (uri, message) {
+    return postData(uri, message)
       .then(data => console.log(data)) // JSON from `response.json()` call
       .catch(error => console.error(error))
   }
 }
 
-function postData(url, data) {
-  // Default options are marked with *
+function postData(uri, data) {
+
   return fetch(url, {
     body: JSON.stringify(data), // must match 'Content-Type' header
-    cache: 'no-cache', // *default, no-cache, reload, force-cache, only-if-cached
     credentials: 'same-origin', // include, same-origin, *omit
     headers: {
-      'user-agent': 'Mozilla/4.0 MDN Example',
       'content-type': 'application/json'
     },
     method: 'POST', // *GET, POST, PUT, DELETE, etc.
     mode: 'cors', // no-cors, cors, *same-origin
-    redirect: 'follow', // manual, *follow, error
-    referrer: 'no-referrer', // *client, no-referrer
   })
   .then(response => response.json()) // parses response to JSON
 }