Issue 6490 - Wrap browser.browserAction.set* with Promise

ext/background.js

Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -312,109 +312,96 @@
   let BrowserAction = function(tabId)
   {
     this._tabId = tabId;
     this._changes = null;
   };
   BrowserAction.prototype = {
     _applyChanges()
     {
-      if ("iconPath" in this._changes)
+      return Promise.all(Object.keys(this._changes).map(change =>
       {
-        // Firefox for Android displays the browser action not as an icon but
-        // as a menu item. There is no icon, but such an option may be added in
-        // the future.
-        // https://bugzilla.mozilla.org/show_bug.cgi?id=1331746
-        if ("setIcon" in browser.browserAction)
+        if (change == "iconPath")

[Sebastian Noack, 2018/06/16 02:02:52]

Combine the check here as well?

  if (change == "iconPath" && "setIcon" in browser.browserAction)

[Jon Sonesen, 2018/07/09 21:15:25]

Acknowledged.

         {
-          let path = {
-            16: this._changes.iconPath.replace("$size", "16"),
-            19: this._changes.iconPath.replace("$size", "19"),
-            20: this._changes.iconPath.replace("$size", "20"),
-            32: this._changes.iconPath.replace("$size", "32"),
-            38: this._changes.iconPath.replace("$size", "38"),
-            40: this._changes.iconPath.replace("$size", "40")
-          };
-          try
+          // Firefox for Android displays the browser action not as an icon but
+          // as a menu item. There is no icon, but such an option may be added
+          // in the future.
+          // https://bugzilla.mozilla.org/show_bug.cgi?id=1331746
+          if ("setIcon" in browser.browserAction)
           {
-            browser.browserAction.setIcon({tabId: this._tabId, path});
-          }
-          catch (e)
-          {
-            // Edge throws if passed icon sizes different than 19,20,38,40px.
-            delete path[16];
-            delete path[32];
-            browser.browserAction.setIcon({tabId: this._tabId, path});
+            let path = {
+              16: this._changes.iconPath.replace("$size", "16"),
+              19: this._changes.iconPath.replace("$size", "19"),
+              20: this._changes.iconPath.replace("$size", "20"),
+              32: this._changes.iconPath.replace("$size", "32"),
+              38: this._changes.iconPath.replace("$size", "38"),
+              40: this._changes.iconPath.replace("$size", "40")
+            };
+            try
+            {
+              return browser.browserAction.setIcon({tabId: this._tabId, path});
+            }
+            catch (e)
+            {
+              // Edge throws if passed icon sizes different than 19,20,38,40px.
+              delete path[16];
+              delete path[32];
+              return browser.browserAction.setIcon({tabId: this._tabId, path});
+            }
           }
         }
-      }
 
-      if ("badgeText" in this._changes)
-      {
         // There is no badge on Firefox for Android; the browser action is
         // simply a menu item.
-        if ("setBadgeText" in browser.browserAction)
-        {
-          browser.browserAction.setBadgeText({
+        if (change == "badgeText" && "setBadgeText" in browser.browserAction)
+          return browser.browserAction.setBadgeText({
             tabId: this._tabId,
             text: this._changes.badgeText
           });
-        }
-      }
 
-      if ("badgeColor" in this._changes)
-      {
         // There is no badge on Firefox for Android; the browser action is
         // simply a menu item.
-        if ("setBadgeBackgroundColor" in browser.browserAction)
-        {
-          browser.browserAction.setBadgeBackgroundColor({
+        if (change == "badgeColor" &&
+        "setBadgeBackgroundColor" in browser.browserAction)

[Sebastian Noack, 2018/06/16 02:02:52]

Nit: Please indent this line so that the condition on this line is aligned with
the condition on the line above:

  if (change == "badgeColor" &&
      "setBadgeBackgroundColor" in browser.browserAction)

[Jon Sonesen, 2018/07/09 21:15:25]

Acknowledged.

+          return browser.browserAction.setBadgeBackgroundColor({
             tabId: this._tabId,
             color: this._changes.badgeColor
           });
-        }
-      }
-
-      this._changes = null;
-    },
-    _queueChanges()
-    {
-      browser.tabs.get(this._tabId, () =>
-      {
-        // If the tab is prerendered, browser.tabs.get() sets
-        // browser.runtime.lastError and we have to delay our changes
-        // until the currently visible tab is replaced with the
-        // prerendered tab. Otherwise browser.browserAction.set* fails.
-        if (browser.runtime.lastError)
-        {
-          let onReplaced = (addedTabId, removedTabId) =>
-          {
-            if (addedTabId == this._tabId)
-            {
-              browser.tabs.onReplaced.removeListener(onReplaced);
-              this._applyChanges();
-            }
-          };
-          browser.tabs.onReplaced.addListener(onReplaced);
-        }
-        else
-        {
-          this._applyChanges();
-        }
-      });
+      }));
     },
     _addChange(name, value)
     {
+      let onReplaced = (addedTabId, removedTabId) =>

[Sebastian Noack, 2018/06/16 02:02:53]

For better code locality, I'd define this listener right before registering it,
like you did before.

[Jon Sonesen, 2018/07/09 21:15:24]

Acknowledged.

+      {
+        if (addedTabId == this._tabId)
+        {
+          browser.tabs.onReplaced.removeListener(onReplaced);
+          this._applyChanges().then(() =>
+          {
+            this._changes = null;
+          });
+        }
+      };
       if (!this._changes)
-      {
         this._changes = {};
-        this._queueChanges();
-      }
 
       this._changes[name] = value;
+      if (!browser.tabs.onReplaced.hasListener(onReplaced))

[Sebastian Noack, 2018/06/16 02:02:53]

Is this check necessary? It might be better to just rely on this._changes:

  let applyChanges = false;

  if (!this._changes)
  {
    this._changes = {};
    applyChanges = true;
  }

  this._changes[name] = value;

  if (applyChanges)
  {
    this._applyChanges().then(...);
  }

[Jon Sonesen, 2018/07/09 21:15:24]

Acknowledged.

[Jon Sonesen, 2018/07/09 22:46:00]

So perhaps i did this wrong but removing the check and the onReplaced definition
and using the applyChanges boolean doesn't seem to work right. It appears to not
be a reliable indicator of whether the listener is registered.

+      {
+        this._applyChanges().then(() =>
+        {
+          this._changes = null;
+        }).catch(() =>

[Sebastian Noack, 2018/06/16 02:02:53]

Instead of .then(onSuccess).catch(onFailure),
you can call .then(onSuccess, onFailure).

[Jon Sonesen, 2018/07/09 21:15:25]

Yeah, I am aware of that. I thought it was a bit more readable but your
suggestion fits our callbackish coding style better.

+        {
+          // If the tab is prerendered, browser.browserAction.set* fails
+          // and we have to delay our changes until the currently visible tab
+          // is replaced with the prerendered tab.
+          browser.tabs.onReplaced.addListener(onReplaced);
+        });
+      }
     },
     setIcon(path)
     {
       this._addChange("iconPath", path);
     },
     setBadge(badge)
     {
       if (!badge)