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// Copyright (c) 2012 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.
#ifndef CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
#define CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
#include <memory>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "content/browser/loader/resource_controller.h"
#include "content/browser/loader/resource_handler.h"
#include "content/browser/ssl/ssl_client_auth_handler.h"
#include "content/browser/ssl/ssl_error_handler.h"
#include "content/common/content_export.h"
#include "net/url_request/url_request.h"
#include "url/gurl.h"
namespace net {
class X509Certificate;
}
namespace content {
class ResourceDispatcherHostLoginDelegate;
class ResourceHandler;
class ResourceLoaderDelegate;
class ResourceRequestInfoImpl;
// This class is responsible for driving the URLRequest (i.e., calling Start,
// Read, and servicing events). It has a ResourceHandler, which is typically a
// chain of ResourceHandlers, and is the ResourceController for its handler.
class CONTENT_EXPORT ResourceLoader : public net::URLRequest::Delegate,
public SSLErrorHandler::Delegate,
public SSLClientAuthHandler::Delegate,
public ResourceHandler::Delegate {
public:
ResourceLoader(std::unique_ptr<net::URLRequest> request,
std::unique_ptr<ResourceHandler> handler,
ResourceLoaderDelegate* delegate);
~ResourceLoader() override;
void StartRequest();
void CancelRequest(bool from_renderer);
bool is_transferring() const { return is_transferring_; }
void MarkAsTransferring(const base::Closure& on_transfer_complete_callback);
void CompleteTransfer();
net::URLRequest* request() { return request_.get(); }
ResourceRequestInfoImpl* GetRequestInfo();
void ClearLoginDelegate();
// ResourceHandler::Delegate implementation:
void OutOfBandCancel(int error_code, bool tell_renderer) override;
private:
// ResourceController implementation for the ResourceLoader.
class Controller;
// net::URLRequest::Delegate implementation:
void OnReceivedRedirect(net::URLRequest* request,
const net::RedirectInfo& redirect_info,
bool* defer) override;
void OnAuthRequired(net::URLRequest* request,
net::AuthChallengeInfo* info) override;
void OnCertificateRequested(net::URLRequest* request,
net::SSLCertRequestInfo* info) override;
void OnSSLCertificateError(net::URLRequest* request,
const net::SSLInfo& info,
bool fatal) override;
void OnResponseStarted(net::URLRequest* request) override;
void OnReadCompleted(net::URLRequest* request, int bytes_read) override;
// SSLErrorHandler::Delegate implementation:
void CancelSSLRequest(int error, const net::SSLInfo* ssl_info) override;
void ContinueSSLRequest() override;
// SSLClientAuthHandler::Delegate implementation.
void ContinueWithCertificate(net::X509Certificate* cert) override;
void CancelCertificateSelection() override;
// These correspond to Controller's methods.
// TODO(mmenke): Seems like this could be simplified a little.
// |called_from_resource_controller| is true if called directly from a
// ResourceController, in which case |resource_handler_| must not be invoked
// or destroyed synchronously to avoid re-entrancy issues, and false
// otherwise.
void Resume(bool called_from_resource_controller);
void Cancel();
void CancelAndIgnore();
void CancelWithError(int error_code);
void StartRequestInternal();
void CancelRequestInternal(int error, bool from_renderer);
void FollowDeferredRedirectInternal();
void CompleteResponseStarted();
// If |handle_result_async| is true, the result of the following read will be
// handled asynchronously if it completes synchronously, unless it's EOF or an
// error. This is to prevent a single request from blocking the thread for too
// long.
void PrepareToReadMore(bool handle_result_async);
void ReadMore(bool handle_result_async);
void ResumeReading();
// Passes a read result to the handler.
void CompleteRead(int bytes_read);
void ResponseCompleted();
void CallDidFinishLoading();
void RecordHistograms();
bool is_deferred() const { return deferred_stage_ != DEFERRED_NONE; }
// Used for categorizing loading of prefetches for reporting in histograms.
// NOTE: This enumeration is used in histograms, so please do not add entries
// in the middle.
enum PrefetchStatus {
STATUS_UNDEFINED,
STATUS_SUCCESS_FROM_CACHE,
STATUS_SUCCESS_FROM_NETWORK,
STATUS_CANCELED,
STATUS_SUCCESS_ALREADY_PREFETCHED,
STATUS_MAX,
};
enum DeferredStage {
DEFERRED_NONE,
// Magic deferral "stage" which means that the code is currently in a
// recursive call from the ResourceLoader. When in this state, Resume() does
// nothing but update the deferral state, and when the stack is unwound back
// up to the ResourceLoader, the request will be continued. This is used to
// prevent the stack from getting too deep.
DEFERRED_SYNC,
DEFERRED_START,
DEFERRED_REDIRECT,
DEFERRED_ON_WILL_READ,
DEFERRED_READ,
DEFERRED_RESPONSE_COMPLETE,
DEFERRED_FINISH
};
DeferredStage deferred_stage_;
class ScopedDeferral;
std::unique_ptr<net::URLRequest> request_;
std::unique_ptr<ResourceHandler> handler_;
ResourceLoaderDelegate* delegate_;
scoped_refptr<ResourceDispatcherHostLoginDelegate> login_delegate_;
std::unique_ptr<SSLClientAuthHandler> ssl_client_auth_handler_;
base::TimeTicks read_deferral_start_time_;
// Indicates that we are in a state of being transferred to a new downstream
// consumer. We are waiting for a notification to complete the transfer, at
// which point we'll receive a new ResourceHandler.
bool is_transferring_;
// Called when a navigation has finished transfer.
base::Closure on_transfer_complete_callback_;
// Instrumentation add to investigate http://crbug.com/503306.
// TODO(mmenke): Remove once bug is fixed.
int times_cancelled_before_request_start_;
bool started_request_;
int times_cancelled_after_request_start_;
// Stores the URL from a deferred redirect.
GURL deferred_redirect_url_;
// Read buffer and its size. Class members as OnWillRead can complete
// asynchronously.
scoped_refptr<net::IOBuffer> read_buffer_;
int read_buffer_size_;
base::ThreadChecker thread_checker_;
base::WeakPtrFactory<ResourceLoader> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ResourceLoader);
};
} // namespace content
#endif // CONTENT_BROWSER_LOADER_RESOURCE_LOADER_H_
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