content/browser/appcache/appcache_request_handler.h

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
   6 #define CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/supports_user_data.h"
  10 #include "content/browser/appcache/appcache_entry.h"
  11 #include "content/browser/appcache/appcache_host.h"
  12 #include "content/common/content_export.h"
  13 #include "content/public/common/resource_type.h"
  14
  15 namespace net {
  16 class NetworkDelegate;
  17 class URLRequest;
  18 class URLRequestJob;
  19 }  // namespace net
  20
  21 namespace content {
  22 class AppCacheRequestHandlerTest;
  23 class AppCacheURLRequestJob;
  24
  25 // An instance is created for each net::URLRequest. The instance survives all
  26 // http transactions involved in the processing of its net::URLRequest, and is
  27 // given the opportunity to hijack the request along the way. Callers
  28 // should use AppCacheHost::CreateRequestHandler to manufacture instances
  29 // that can retrieve resources for a particular host.
  30 class CONTENT_EXPORT AppCacheRequestHandler
  31     : public base::SupportsUserData::Data,
  32       public AppCacheHost::Observer,
  33       public AppCacheStorage::Delegate  {
  34  public:
  35   virtual ~AppCacheRequestHandler();
  36
  37   // These are called on each request intercept opportunity.
  38   AppCacheURLRequestJob* MaybeLoadResource(
  39       net::URLRequest* request, net::NetworkDelegate* network_delegate);
  40   AppCacheURLRequestJob* MaybeLoadFallbackForRedirect(
  41       net::URLRequest* request,
  42       net::NetworkDelegate* network_delegate,
  43       const GURL& location);
  44   AppCacheURLRequestJob* MaybeLoadFallbackForResponse(
  45       net::URLRequest* request, net::NetworkDelegate* network_delegate);
  46
  47   void GetExtraResponseInfo(int64* cache_id, GURL* manifest_url);
  48
  49   // Methods to support cross site navigations.
  50   void PrepareForCrossSiteTransfer(int old_process_id);
  51   void CompleteCrossSiteTransfer(int new_process_id, int new_host_id);
  52
  53   static bool IsMainResourceType(ResourceType type) {
  54     return IsResourceTypeFrame(type) ||
  55            type == RESOURCE_TYPE_SHARED_WORKER;
  56   }
  57
  58  private:
  59   friend class AppCacheHost;
  60
  61   // Callers should use AppCacheHost::CreateRequestHandler.
  62   AppCacheRequestHandler(AppCacheHost* host, ResourceType resource_type);
  63
  64   // AppCacheHost::Observer override
  65   virtual void OnDestructionImminent(AppCacheHost* host) OVERRIDE;
  66
  67   // Helpers to instruct a waiting job with what response to
  68   // deliver for the request we're handling.
  69   void DeliverAppCachedResponse(const AppCacheEntry& entry, int64 cache_id,
  70                                 int64 group_id, const GURL& manifest_url,
  71                                 bool is_fallback,
  72                                 const GURL& namespace_entry_url);
  73   void DeliverNetworkResponse();
  74   void DeliverErrorResponse();
  75
  76   // Helper to retrieve a pointer to the storage object.
  77   AppCacheStorage* storage() const;
  78
  79   bool is_main_resource() const {
  80     return IsMainResourceType(resource_type_);
  81   }
  82
  83   // Main-resource loading -------------------------------------
  84   // Frame and SharedWorker main resources are handled here.
  85
  86   void MaybeLoadMainResource(net::URLRequest* request,
  87                              net::NetworkDelegate* network_delegate);
  88
  89   // AppCacheStorage::Delegate methods
  90   virtual void OnMainResponseFound(
  91       const GURL& url, const AppCacheEntry& entry,
  92       const GURL& fallback_url, const AppCacheEntry& fallback_entry,
  93       int64 cache_id, int64 group_id, const GURL& mainfest_url) OVERRIDE;
  94
  95   // Sub-resource loading -------------------------------------
  96   // Dedicated worker and all manner of sub-resources are handled here.
  97
  98   void MaybeLoadSubResource(net::URLRequest* request,
  99                             net::NetworkDelegate* network_delegate);
 100   void ContinueMaybeLoadSubResource();
 101
 102   // AppCacheHost::Observer override
 103   virtual void OnCacheSelectionComplete(AppCacheHost* host) OVERRIDE;
 104
 105   // Data members -----------------------------------------------
 106
 107   // What host we're servicing a request for.
 108   AppCacheHost* host_;
 109
 110   // Frame vs subresource vs sharedworker loads are somewhat different.
 111   ResourceType resource_type_;
 112
 113   // Subresource requests wait until after cache selection completes.
 114   bool is_waiting_for_cache_selection_;
 115
 116   // Info about the type of response we found for delivery.
 117   // These are relevant for both main and subresource requests.
 118   int64 found_group_id_;
 119   int64 found_cache_id_;
 120   AppCacheEntry found_entry_;
 121   AppCacheEntry found_fallback_entry_;
 122   GURL found_namespace_entry_url_;
 123   GURL found_manifest_url_;
 124   bool found_network_namespace_;
 125
 126   // True if a cache entry this handler attempted to return was
 127   // not found in the disk cache. Once set, the handler will take
 128   // no action on all subsequent intercept opportunities, so the
 129   // request and any redirects will be handled by the network library.
 130   bool cache_entry_not_found_;
 131
 132   // True if this->MaybeLoadResource(...) has been called in the past.
 133   bool maybe_load_resource_executed_;
 134
 135   // The job we use to deliver a response.
 136   scoped_refptr<AppCacheURLRequestJob> job_;
 137
 138   // During a cross site navigation, we transfer ownership the AppcacheHost
 139   // from the old processes structures over to the new structures.
 140   scoped_ptr<AppCacheHost> host_for_cross_site_transfer_;
 141
 142   friend class content::AppCacheRequestHandlerTest;
 143   DISALLOW_COPY_AND_ASSIGN(AppCacheRequestHandler);
 144 };
 145
 146 }  // namespace content
 147
 148 #endif  // CONTENT_BROWSER_APPCACHE_APPCACHE_REQUEST_HANDLER_H_