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      1 // Copyright (c) 2012 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_LOADER_RESOURCE_MESSAGE_FILTER_H_
      6 #define CONTENT_BROWSER_LOADER_RESOURCE_MESSAGE_FILTER_H_
      7 
      8 #include "base/callback_forward.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/memory/weak_ptr.h"
     11 #include "content/common/content_export.h"
     12 #include "content/public/browser/browser_message_filter.h"
     13 #include "webkit/common/resource_type.h"
     14 
     15 struct ResourceHostMsg_Request;
     16 
     17 namespace fileapi {
     18 class FileSystemContext;
     19 }  // namespace fileapi
     20 
     21 namespace net {
     22 class URLRequestContext;
     23 }  // namespace net
     24 
     25 
     26 namespace content {
     27 class ChromeAppCacheService;
     28 class ChromeBlobStorageContext;
     29 class ResourceContext;
     30 
     31 // This class filters out incoming IPC messages for network requests and
     32 // processes them on the IPC thread.  As a result, network requests are not
     33 // delayed by costly UI processing that may be occuring on the main thread of
     34 // the browser.  It also means that any hangs in starting a network request
     35 // will not interfere with browser UI.
     36 class CONTENT_EXPORT ResourceMessageFilter : public BrowserMessageFilter {
     37  public:
     38   typedef base::Callback<void(const ResourceHostMsg_Request&,
     39                               ResourceContext**,
     40                               net::URLRequestContext**)> GetContextsCallback;
     41 
     42   // |appcache_service|, |blob_storage_context|, |file_system_context| may be
     43   // NULL in unittests or for requests from the (NPAPI) plugin process.
     44   ResourceMessageFilter(
     45       int child_id,
     46       int process_type,
     47       ChromeAppCacheService* appcache_service,
     48       ChromeBlobStorageContext* blob_storage_context,
     49       fileapi::FileSystemContext* file_system_context,
     50       const GetContextsCallback& get_contexts_callback);
     51 
     52   // BrowserMessageFilter implementation.
     53   virtual void OnChannelClosing() OVERRIDE;
     54   virtual bool OnMessageReceived(const IPC::Message& message,
     55                                  bool* message_was_ok) OVERRIDE;
     56 
     57   void GetContexts(const ResourceHostMsg_Request& request,
     58                    ResourceContext** resource_context,
     59                    net::URLRequestContext** request_context);
     60 
     61   // Returns the net::URLRequestContext for the given request.
     62   net::URLRequestContext* GetURLRequestContext(
     63       ResourceType::Type request_type);
     64 
     65   ChromeAppCacheService* appcache_service() const {
     66     return appcache_service_.get();
     67   }
     68 
     69   ChromeBlobStorageContext* blob_storage_context() const {
     70     return blob_storage_context_.get();
     71   }
     72 
     73   fileapi::FileSystemContext* file_system_context() const {
     74     return file_system_context_.get();
     75   }
     76 
     77   int child_id() const { return child_id_; }
     78   int process_type() const { return process_type_; }
     79 
     80   base::WeakPtr<ResourceMessageFilter> GetWeakPtr();
     81 
     82  protected:
     83   // Protected destructor so that we can be overriden in tests.
     84   virtual ~ResourceMessageFilter();
     85 
     86  private:
     87   // The ID of the child process.
     88   int child_id_;
     89 
     90   int process_type_;
     91 
     92   scoped_refptr<ChromeAppCacheService> appcache_service_;
     93   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
     94   scoped_refptr<fileapi::FileSystemContext> file_system_context_;
     95 
     96   GetContextsCallback get_contexts_callback_;
     97 
     98   // This must come last to make sure weak pointers are invalidated first.
     99   base::WeakPtrFactory<ResourceMessageFilter> weak_ptr_factory_;
    100 
    101   DISALLOW_IMPLICIT_CONSTRUCTORS(ResourceMessageFilter);
    102 };
    103 
    104 }  // namespace content
    105 
    106 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_MESSAGE_FILTER_H_
    107