Merge branch 'master' into mascara-deploy

1 files changed, 52 insertions, 24 deletions

diff --git a/app/scripts/lib/auto-reload.js b/app/scripts/lib/auto-reload.js
index 1302df35f..cce31c3d2 100644
--- a/app/scripts/lib/auto-reload.js
+++ b/app/scripts/lib/auto-reload.js
@@ -1,30 +1,58 @@
-const once = require('once')
-const ensnare = require('ensnare')
-
 module.exports = setupDappAutoReload
 
-function setupDappAutoReload (web3) {
+function setupDappAutoReload (web3, observable) {
   // export web3 as a global, checking for usage
-  var pageIsUsingWeb3 = false
-  var resetWasRequested = false
-  global.web3 = ensnare(web3, once(function () {
-    // if web3 usage happened after a reset request, trigger reset late
-    if (resetWasRequested) return triggerReset()
-    // mark web3 as used
-    pageIsUsingWeb3 = true
-    // reset web3 reference
-    global.web3 = web3
-  }))
-
-  return handleResetRequest
-
-  function handleResetRequest () {
-    resetWasRequested = true
-    // ignore if web3 was not used
-    if (!pageIsUsingWeb3) return
-    // reload after short timeout
-    setTimeout(triggerReset, 500)
-  }
+  let hasBeenWarned = false
+  let reloadInProgress = false
+  let lastTimeUsed
+  let lastSeenNetwork
+
+  global.web3 = new Proxy(web3, {
+    get: (_web3, key) => {
+      // show warning once on web3 access
+      if (!hasBeenWarned && key !== 'currentProvider') {
+        console.warn('MetaMask: web3 will be deprecated in the near future in favor of the ethereumProvider \nhttps://github.com/MetaMask/faq/blob/master/detecting_metamask.md#web3-deprecation')
+        hasBeenWarned = true
+      }
+      // get the time of use
+      lastTimeUsed = Date.now()
+      // return value normally
+      return _web3[key]
+    },
+    set: (_web3, key, value) => {
+      // set value normally
+      _web3[key] = value
+    },
+  })
+
+  observable.subscribe(function (state) {
+    // if reload in progress, no need to check reload logic
+    if (reloadInProgress) return
+
+    const currentNetwork = state.networkVersion
+
+    // set the initial network
+    if (!lastSeenNetwork) {
+      lastSeenNetwork = currentNetwork
+      return
+    }
+
+    // skip reload logic if web3 not used
+    if (!lastTimeUsed) return
+
+    // if network did not change, exit
+    if (currentNetwork === lastSeenNetwork) return
+
+    // initiate page reload
+    reloadInProgress = true
+    const timeSinceUse = Date.now() - lastTimeUsed
+    // if web3 was recently used then delay the reloading of the page
+    if (timeSinceUse > 500) {
+      triggerReset()
+    } else {
+      setTimeout(triggerReset, 500)
+    }
+  })
 }
 
 // reload the page