Implement offline mode behind a flag

content/browser/loader/offline_manager.cc

+// Copyright (c) 2013 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/offline_manager.h"
+
+#include "content/common/resource_messages.h"
+#include "net/base/load_flags.h"
+#include "net/http/http_response_info.h"
+#include "net/url_request/url_request.h"
+
+namespace content {
+
+OfflineManager::OfflineManager() {}
+
+OfflineManager::~OfflineManager() {}
+
+int OfflineManager::OfflineLoadFlags(
+    int child_id, int route_id, const ResourceHostMsg_Request& request_data) {

[darin (slow to review), 2013/03/27 18:33:59]

how will you use the request_data parameter?

[Randy Smith (Not in Mondays), 2013/04/03 19:20:34]

Ooops :-}.  I original put it in so that I'd have access to the MAIN_FRAME
parameter, but I'm not using that, but I should be.  I think based on the other
conversations we've had, I'm going to modify this arg to be
request_data.resource_type.

+  std::pair<int, int> key(std::make_pair(child_id, route_id));
+  // std::map::insert just returns an existing element if it already exists.
+  const RouteMap::iterator it(
+      offline_state_map_.insert(std::make_pair(key, ROUTE_INIT)).first);
+  switch(it->second) {
+    case ROUTE_INIT:
+      return net::LOAD_FROM_CACHE_IF_OFFLINE;
+    case ROUTE_ONLINE:
+      return 0;
+    case ROUTE_OFFLINE:
+      return net::LOAD_ONLY_FROM_CACHE;
+  }
+  NOTREACHED();
+  return 0;
+}
+
+void OfflineManager::RequestCompleted(
+    int child_id, int route_id, const net::URLRequest* request) {
+  const RouteMap::iterator it(
+      offline_state_map_.find(std::make_pair(child_id, route_id)));
+  const net::HttpResponseInfo& response_info(request->response_info());
+
+  // We should have seen this on the incoming side.
+  DCHECK(offline_state_map_.end() != it);
+
+  if (it->second == ROUTE_INIT) {
+    if (response_info.server_data_unavailable) {
+      it->second = ROUTE_OFFLINE;
+    } else if (!response_info.was_cached ||
+               response_info.response_time >= request->creation_time()) {
+      // If we got the response from the network or validated it as part
+      // of this request, that means our connection to the host is working.
+      it->second = ROUTE_ONLINE;
+    }
+  }
+}
+
+void OfflineManager::RouteDeleted(int child_id, int route_id) {
+  const RouteMap::iterator it(
+      offline_state_map_.find(std::make_pair(child_id, route_id)));
+  if (offline_state_map_.end() != it)
+    offline_state_map_.erase(it);
+}
+
+}  // namespace content