Cross-process postMessage

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #if defined(OS_WIN)
@@ skipping 866 matching lines @@
       IPC_MESSAGE_HANDLER(ChildProcessHostMsg_ShutdownRequest,
                           OnShutdownRequest)
       IPC_MESSAGE_HANDLER(ChildProcessHostMsg_DumpHandlesDone,
                           OnDumpHandlesDone)
       IPC_MESSAGE_HANDLER(ViewHostMsg_SuddenTerminationChanged,
                           SuddenTerminationChanged)
       IPC_MESSAGE_HANDLER(ViewHostMsg_UserMetricsRecordAction,
                           OnUserMetricsRecordAction)
       IPC_MESSAGE_HANDLER(ViewHostMsg_RevealFolderInOS, OnRevealFolderInOS)
       IPC_MESSAGE_HANDLER(ViewHostMsg_SavedPageAsMHTML, OnSavedPageAsMHTML)
+      IPC_MESSAGE_HANDLER(ViewHostMsg_SendPostMessage, OnSendPostMessage)
       IPC_MESSAGE_UNHANDLED_ERROR()
     IPC_END_MESSAGE_MAP_EX()
 
     if (!msg_is_ok) {
       // The message had a handler, but its de-serialization failed.
       // We consider this a capital crime. Kill the renderer if we have one.
       LOG(ERROR) << "bad message " << msg.type() << " terminating renderer.";
       content::RecordAction(UserMetricsAction("BadMessageTerminate_BRPH"));
       ReceivedBadMessage();
     }
@@ skipping 406 matching lines @@
 void RenderProcessHostImpl::OnRevealFolderInOS(const FilePath& path) {
   // Only honor the request if appropriate persmissions are granted.
   if (ChildProcessSecurityPolicy::GetInstance()->CanReadFile(GetID(), path))
     content::GetContentClient()->browser()->OpenItem(path);
 }
 
 void RenderProcessHostImpl::OnSavedPageAsMHTML(int job_id, int64 data_size) {
   content::GetContentClient()->browser()->GetMHTMLGenerationManager()->
       MHTMLGenerated(job_id, data_size);
 }
+
+void RenderProcessHostImpl::OnSendPostMessage(
+    int64 content_frame_id,
+    const ViewMsg_PostMessage_Params& params) {
+  DLOG(WARNING) << "OnSendPostMessage";

[awong, 2011/12/21 01:56:07]

I assume we'll sweep through and clean up some DLOGs?

+  content::FrameMap& frame_mapper = GetBrowserContext()->frame_mapper();
+  content::ContentFrame* frame =
+      frame_mapper.FindFrame(content_frame_id);
+
+  // Until we remove the proxy when a frame is closed, there might be a proxy
+  // for a frame that no longer exists. If that's the case, just drop the msg.

[awong, 2011/12/21 01:56:07]

Should there be a TODO here as well?

+  if (!frame)
+    return;
+
+  RenderViewHost *rvh = RenderViewHost::FromID(frame->current_process_host_id(),
+                                               frame->current_route_id());
+
+  // TODO(supersat): Temporary workaround for frames not being removed from
+  // the mapper properly.

[awong, 2011/12/21 01:56:07]

Can we state the condition on which this should be removed?  Makes it easier for
future maintainers to know if they can safely fix a TODO.

+  if (!rvh) {
+    return;
+  }
+
+  rvh->Send(new ViewMsg_PostMessage(rvh->routing_id(),
+                                    frame->current_frame_id(),
+                                    params));
+}