PROTOTYPE: PlzNavigate: use a Mojo data pipe to stream navigation data to the renderer.

content/browser/loader/navigation_resource_handler.cc

 // Copyright 2014 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.
 
 #include "content/browser/loader/navigation_resource_handler.h"
 
 #include "base/logging.h"
 #include "content/browser/devtools/devtools_netlog_observer.h"
 #include "content/browser/loader/navigation_url_loader_impl_core.h"
+#include "content/browser/loader/resource_message_filter.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/browser/resource_context_impl.h"
 #include "content/browser/streams/stream.h"
 #include "content/browser/streams/stream_context.h"
+#include "content/common/resource_messages.h"
 #include "content/public/browser/resource_controller.h"
 #include "content/public/browser/stream_handle.h"
 #include "content/public/common/resource_response.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request.h"
 
 namespace content {
 
 NavigationResourceHandler::NavigationResourceHandler(
     net::URLRequest* request,
     NavigationURLLoaderImplCore* core)
     : ResourceHandler(request),
       core_(core) {
   core_->set_resource_handler(this);
-  writer_.set_immediate_mode(true);
 }
 
 NavigationResourceHandler::~NavigationResourceHandler() {
   if (core_) {
     core_->NotifyRequestFailed(false, net::ERR_ABORTED);
     DetachFromCore();
   }
 }
 
 void NavigationResourceHandler::Cancel() {
@@ skipping 14 matching lines @@
     const net::RedirectInfo& redirect_info,
     ResourceResponse* response,
     bool* defer) {
   DCHECK(core_);
 
   // TODO(davidben): Perform a CSP check here, and anything else that would have
   // been done renderer-side.
   DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
   core_->NotifyRequestRedirected(redirect_info, response);
   *defer = true;
+
   return true;
 }
 
 bool NavigationResourceHandler::OnResponseStarted(ResourceResponse* response,
                                                   bool* defer) {
+  // TODO(carlosk): review the TODO below. :) When I wrote it I thought we
+  // needed to send ResourceMsg_ReceivedResponse from here but it seems we
+  // don't.
+  // TODO(carlosk): More "work" is done in
+  // AsyncResourceHandler::OnResponseStarted than here. Now that this is the
+  // resource handler actually carrying out the navigation load, some of that
+  // has to be done here to. I'm adding TODOs below for some that but I'm not
+  // fully sure of what's needed and what's not and further investigation is
+  // need.
+  // I'm assuming anything mentioning "upload", RDH delegate (we don't have one
+  // in this class), "download", InliningHelper (I don't think we need one) are
+  // not needed here.
+  // TODO(carlosk): The same as above should affect other methods existing in
+  // both classes.
   DCHECK(core_);
 
+  // TODO(carlosk): see if we need the time recording in
+  // response_started_ticks_ used later for UMA metrics.
+
   ResourceRequestInfoImpl* info = GetRequestInfo();
+  LOG(ERROR)
+      << "*** NavigationResourceHandler::OnResponseStarted frame_tree_node_id: "
+      << info->frame_tree_node_id();
+
+  // TODO(carlosk): see if we need the filter check.
 
   // If the MimeTypeResourceHandler intercepted this request and converted it
   // into a download, it will still call OnResponseStarted and immediately
   // cancel. Ignore the call; OnReadCompleted will happen shortly.
   //
   // TODO(davidben): Move the dispatch out of MimeTypeResourceHandler. Perhaps
   // all the way to the UI thread. Downloads, user certificates, etc., should be
   // dispatched at the navigation layer.
   if (info->IsDownload() || info->is_stream())
     return true;
 
-  StreamContext* stream_context =
-      GetStreamContextForResourceContext(info->GetContext());
-  writer_.InitializeStream(stream_context->registry(),
-                           request()->url().GetOrigin());
+  mojo::ScopedDataPipeConsumerHandle data_consumer_handle;
+  writer_.InitializeStream(&data_consumer_handle);
 
   // Detach from the loader; at this point, the request is now owned by the
   // StreamHandle.
   DevToolsNetLogObserver::PopulateResponseInfo(request(), response);
-  core_->NotifyResponseStarted(response, writer_.stream()->CreateHandle());
+  // MAYBE SHOULD SEND THE CONSUMER HANDLE REFERENCE DIRECTLY FROM HERE?
+  core_->NotifyResponseStarted(response, std::move(data_consumer_handle),
+                               GetRequestID());
   DetachFromCore();
+
+  // TODO(carlosk): see if we need the zoom level control here (I assume we do).
+
+  response->head.request_start = request()->creation_time();
+  response->head.response_start = base::TimeTicks::Now();
+
+  // TODO(carlosk): see if we need the guard for http://crbug.com/124680 using
+  // sent_received_response_msg_.
+
+  // TODO(carlosk): see if we need to send ResourceMsg_ReceivedCachedMetadata.
+
   return true;
 }
 
 bool NavigationResourceHandler::OnWillStart(const GURL& url, bool* defer) {
   return true;
 }
 
 bool NavigationResourceHandler::OnBeforeNetworkStart(const GURL& url,
                                                      bool* defer) {
   return true;
@@ skipping 12 matching lines @@
 }
 
 void NavigationResourceHandler::OnResponseCompleted(
     const net::URLRequestStatus& status,
     const std::string& security_info,
     bool* defer) {
   // If the request has already committed, close the stream and leave it as-is.
   //
   // TODO(davidben): The net error code should be passed through StreamWriter
   // down to the stream's consumer. See https://crbug.com/426162.
-  if (writer_.stream()) {
+  if (writer_.has_stream()) {
     writer_.Finalize();
+    ResourceRequestInfoImpl* info = GetRequestInfo();
+    LOG(ERROR) << "*** NavigationResourceHandler::OnResponseCompleted "
+                  "frame_tree_node_id: "
+               << info->frame_tree_node_id();
     return;
   }
 
   if (core_) {
     DCHECK_NE(net::OK, status.error());
     core_->NotifyRequestFailed(request()->response_info().was_cached,
                                status.error());
     DetachFromCore();
   }
 }
 
 void NavigationResourceHandler::OnDataDownloaded(int bytes_downloaded) {
   NOTREACHED();
 }
 
 void NavigationResourceHandler::DetachFromCore() {
   DCHECK(core_);
   core_->set_resource_handler(nullptr);
   core_ = nullptr;
 }
 
 }  // namespace content