blob: 9e7e418a2f21de79e94f0687475ef53581585a98 [file] [log] [blame]
// Copyright 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 <memory>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/browser/loader/resource_controller.h"
#include "content/browser/loader/resource_handler.h"
#include "content/common/content_export.h"
namespace net {
class IOBuffer;
class URLRequest;
} // namespace net
namespace content {
class ResourceController;
// A ResourceHandler which delegates all calls to the next handler, unless
// detached. Once detached, it drives the request to completion itself. This is
// used for requests which outlive the owning renderer, such as <link
// rel=prefetch> and <a ping>. Requests do not start out detached so, e.g.,
// prefetches appear in DevTools and get placed in the renderer's local
// cache. If the request does not complete after a timeout on detach, it is
// cancelled.
// Note that, once detached, the request continues without the original next
// handler, so any policy decisions in that handler are skipped.
class CONTENT_EXPORT DetachableResourceHandler : public ResourceHandler {
DetachableResourceHandler(net::URLRequest* request,
base::TimeDelta cancel_delay,
std::unique_ptr<ResourceHandler> next_handler);
~DetachableResourceHandler() override;
void SetDelegate(Delegate* delegate) override;
bool is_detached() const { return next_handler_ == NULL; }
void Detach();
void set_cancel_delay(base::TimeDelta cancel_delay) {
cancel_delay_ = cancel_delay;
// ResourceHandler implementation:
void OnRequestRedirected(
const net::RedirectInfo& redirect_info,
network::ResourceResponse* response,
std::unique_ptr<ResourceController> controller) override;
void OnResponseStarted(
network::ResourceResponse* response,
std::unique_ptr<ResourceController> controller) override;
void OnWillStart(const GURL& url,
std::unique_ptr<ResourceController> controller) override;
void OnWillRead(scoped_refptr<net::IOBuffer>* buf,
int* buf_size,
std::unique_ptr<ResourceController> controller) override;
void OnReadCompleted(int bytes_read,
std::unique_ptr<ResourceController> controller) override;
void OnResponseCompleted(
const net::URLRequestStatus& status,
std::unique_ptr<ResourceController> controller) override;
class Controller;
void ResumeInternal();
void OnTimedOut();
std::unique_ptr<ResourceHandler> next_handler_;
scoped_refptr<net::IOBuffer> read_buffer_;
std::unique_ptr<base::OneShotTimer> detached_timer_;
base::TimeDelta cancel_delay_;
// Only non-NULL between a call to |next_handler_|'s OnWillRead and it
// resuming the request. Needed so that if detached during that time, can
// complete the call.
scoped_refptr<net::IOBuffer>* parent_read_buffer_;
int* parent_read_buffer_size_;
bool is_finished_;
} // namespace content