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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 "content/public/common/resource_type.h"
     14 
     15 struct ResourceHostMsg_Request;
     16 
     17 namespace storage {
     18 class FileSystemContext;
     19 }  // namespace storage
     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 class ServiceWorkerContextWrapper;
     31 
     32 // This class filters out incoming IPC messages for network requests and
     33 // processes them on the IPC thread.  As a result, network requests are not
     34 // delayed by costly UI processing that may be occuring on the main thread of
     35 // the browser.  It also means that any hangs in starting a network request
     36 // will not interfere with browser UI.
     37 class CONTENT_EXPORT ResourceMessageFilter : public BrowserMessageFilter {
     38  public:
     39   typedef base::Callback<void(const ResourceHostMsg_Request&,
     40                               ResourceContext**,
     41                               net::URLRequestContext**)> GetContextsCallback;
     42 
     43   // |appcache_service|, |blob_storage_context|, |file_system_context| may be
     44   // NULL in unittests or for requests from the (NPAPI) plugin process.
     45   ResourceMessageFilter(int child_id,
     46                         int process_type,
     47                         ChromeAppCacheService* appcache_service,
     48                         ChromeBlobStorageContext* blob_storage_context,
     49                         storage::FileSystemContext* file_system_context,
     50                         ServiceWorkerContextWrapper* service_worker_context,
     51                         const GetContextsCallback& get_contexts_callback);
     52 
     53   // BrowserMessageFilter implementation.
     54   virtual void OnChannelClosing() OVERRIDE;
     55   virtual bool OnMessageReceived(const IPC::Message& message) 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(ResourceType request_type);
     63 
     64   ChromeAppCacheService* appcache_service() const {
     65     return appcache_service_.get();
     66   }
     67 
     68   ChromeBlobStorageContext* blob_storage_context() const {
     69     return blob_storage_context_.get();
     70   }
     71 
     72   storage::FileSystemContext* file_system_context() const {
     73     return file_system_context_.get();
     74   }
     75 
     76   ServiceWorkerContextWrapper* service_worker_context() const {
     77     return service_worker_context_.get();
     78   }
     79 
     80   int child_id() const { return child_id_; }
     81   int process_type() const { return process_type_; }
     82 
     83   base::WeakPtr<ResourceMessageFilter> GetWeakPtr();
     84 
     85  protected:
     86   // Protected destructor so that we can be overriden in tests.
     87   virtual ~ResourceMessageFilter();
     88 
     89  private:
     90   // The ID of the child process.
     91   int child_id_;
     92 
     93   int process_type_;
     94 
     95   scoped_refptr<ChromeAppCacheService> appcache_service_;
     96   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
     97   scoped_refptr<storage::FileSystemContext> file_system_context_;
     98   scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
     99 
    100   GetContextsCallback get_contexts_callback_;
    101 
    102   // This must come last to make sure weak pointers are invalidated first.
    103   base::WeakPtrFactory<ResourceMessageFilter> weak_ptr_factory_;
    104 
    105   DISALLOW_IMPLICIT_CONSTRUCTORS(ResourceMessageFilter);
    106 };
    107 
    108 }  // namespace content
    109 
    110 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_MESSAGE_FILTER_H_
    111