1 // Copyright 2013 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_DETACHABLE_RESOURCE_HANDLER_H_ 6 #define CONTENT_BROWSER_LOADER_DETACHABLE_RESOURCE_HANDLER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/compiler_specific.h" 10 #include "base/memory/ref_counted.h" 11 #include "base/memory/scoped_ptr.h" 12 #include "base/time/time.h" 13 #include "base/timer/timer.h" 14 #include "content/browser/loader/resource_handler.h" 15 #include "content/public/browser/resource_controller.h" 16 17 namespace net { 18 class IOBuffer; 19 class URLRequest; 20 } // namespace net 21 22 namespace content { 23 24 // A ResourceHandler which delegates all calls to the next handler, unless 25 // detached. Once detached, it drives the request to completion itself. This is 26 // used for requests which outlive the owning renderer, such as <link 27 // rel=prefetch> and <a ping>. Requests do not start out detached so, e.g., 28 // prefetches appear in DevTools and get placed in the renderer's local 29 // cache. If the request does not complete after a timeout on detach, it is 30 // cancelled. 31 // 32 // Note that, once detached, the request continues without the original next 33 // handler, so any policy decisions in that handler are skipped. 34 class DetachableResourceHandler : public ResourceHandler, 35 public ResourceController { 36 public: 37 DetachableResourceHandler(net::URLRequest* request, 38 base::TimeDelta cancel_delay, 39 scoped_ptr<ResourceHandler> next_handler); 40 virtual ~DetachableResourceHandler(); 41 is_detached()42 bool is_detached() const { return next_handler_ == NULL; } 43 void Detach(); 44 set_cancel_delay(base::TimeDelta cancel_delay)45 void set_cancel_delay(base::TimeDelta cancel_delay) { 46 cancel_delay_ = cancel_delay; 47 } 48 49 // ResourceHandler implementation: 50 virtual void SetController(ResourceController* controller) OVERRIDE; 51 virtual bool OnUploadProgress(int request_id, uint64 position, 52 uint64 size) OVERRIDE; 53 virtual bool OnRequestRedirected(int request_id, const GURL& url, 54 ResourceResponse* response, 55 bool* defer) OVERRIDE; 56 virtual bool OnResponseStarted(int request_id, 57 ResourceResponse* response, 58 bool* defer) OVERRIDE; 59 virtual bool OnWillStart(int request_id, const GURL& url, 60 bool* defer) OVERRIDE; 61 virtual bool OnWillRead(int request_id, 62 scoped_refptr<net::IOBuffer>* buf, 63 int* buf_size, 64 int min_size) OVERRIDE; 65 virtual bool OnReadCompleted(int request_id, int bytes_read, 66 bool* defer) OVERRIDE; 67 virtual void OnResponseCompleted(int request_id, 68 const net::URLRequestStatus& status, 69 const std::string& security_info, 70 bool* defer) OVERRIDE; 71 virtual void OnDataDownloaded(int request_id, int bytes_downloaded) OVERRIDE; 72 73 // ResourceController implementation: 74 virtual void Resume() OVERRIDE; 75 virtual void Cancel() OVERRIDE; 76 virtual void CancelAndIgnore() OVERRIDE; 77 virtual void CancelWithError(int error_code) OVERRIDE; 78 79 private: 80 scoped_ptr<ResourceHandler> next_handler_; 81 scoped_refptr<net::IOBuffer> read_buffer_; 82 83 scoped_ptr<base::OneShotTimer<DetachableResourceHandler> > detached_timer_; 84 base::TimeDelta cancel_delay_; 85 86 bool is_deferred_; 87 bool is_finished_; 88 89 DISALLOW_COPY_AND_ASSIGN(DetachableResourceHandler); 90 }; 91 92 } // namespace content 93 94 #endif // CONTENT_BROWSER_LOADER_DETACHABLE_RESOURCE_HANDLER_H_ 95