From 6653fa0e588d9fb777b627c947b377fa0518bfc8 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Mon, 14 Mar 2016 09:20:27 +0000
Subject: Use ports to track frames.

Use `onConnect()`, the `domReady` port  and `onDisconnect()` to track
the frames within a tab.
---
 background_scripts/main.coffee | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

(limited to 'background_scripts')

diff --git a/background_scripts/main.coffee b/background_scripts/main.coffee
index 81a694d0..2e0330ee 100644
--- a/background_scripts/main.coffee
+++ b/background_scripts/main.coffee
@@ -377,18 +377,21 @@ openOptionsPageInNewTab = ->
   chrome.tabs.getSelected(null, (tab) ->
     chrome.tabs.create({ url: chrome.runtime.getURL("pages/options.html"), index: tab.index + 1 }))
 
-registerFrame = (request, sender) ->
-  (frameIdsForTab[sender.tab.id] ?= []).push request.frameId
-
-unregisterFrame = (request, sender) ->
-  # When a tab is closing, Chrome sometimes passes messages without sender.tab.  Therefore, we guard against
-  # this.
-  tabId = sender.tab?.id
-  if tabId? and frameIdsForTab[tabId]?
-    if request.tab_is_closing
-      delete frameIdsForTab[tabId]
-    else
-      frameIdsForTab[tabId] = frameIdsForTab[tabId].filter (id) -> id != request.frameId
+Frames =
+  onConnect: (sender) ->
+    (request, port) =>
+      this[request.handler] request, sender, port
+
+  registerFrame: (request, sender, port) ->
+    (frameIdsForTab[sender.tab.id] ?= []).push request.frameId
+
+    [tabId, frameId, isTopFrame] = [sender.tab.id, request.frameId, request.isTopFrame]
+    port.onDisconnect.addListener ->
+      if isTopFrame
+        delete frameIdsForTab[tabId]
+      else
+        if tabId of frameIdsForTab
+          frameIdsForTab[tabId] = frameIdsForTab[tabId].filter (fId) -> fId != frameId
 
 handleFrameFocused = (request, sender) ->
   tabId = sender.tab.id
@@ -420,6 +423,7 @@ bgLog = (request, sender) ->
 # Port handler mapping
 portHandlers =
   completions: handleCompletions
+  domReady: Frames.onConnect.bind Frames
 
 sendRequestHandlers =
   runBackgroundCommand: runBackgroundCommand
@@ -428,8 +432,6 @@ sendRequestHandlers =
   openUrlInIncognito: TabOperations.openUrlInIncognito
   openUrlInCurrentTab: TabOperations.openUrlInCurrentTab
   openOptionsPageInNewTab: openOptionsPageInNewTab
-  registerFrame: registerFrame
-  unregisterFrame: unregisterFrame
   frameFocused: handleFrameFocused
   nextFrame: (request) -> BackgroundCommands.nextFrame 1, request.frameId
   copyToClipboard: copyToClipboard
@@ -457,11 +459,6 @@ chrome.tabs.onRemoved.addListener (tabId) ->
         # There are no remaining incognito-mode tabs, and findModeRawQueryListIncognito is set.
         chrome.storage.local.remove "findModeRawQueryListIncognito"
 
-# Tidy up tab caches when tabs are removed.  We cannot rely on unregisterFrame because Chrome does not always
-# provide sender.tab there.
-chrome.tabs.onRemoved.addListener (tabId) ->
-  delete cache[tabId] for cache in [ frameIdsForTab, urlForTab ]
-
 # Convenience function for development use.
 window.runTests = -> open(chrome.runtime.getURL('tests/dom_tests/dom_tests.html'))
 
-- 
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