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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 GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_
#define GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "google_apis/drive/gdata_errorcode.h"
namespace base {
class SequencedTaskRunner;
}
namespace net {
class URLRequestContextGetter;
}
namespace google_apis {
class AuthenticatedRequestInterface;
class AuthServiceInterface;
// Helper class that sends requests implementing
// AuthenticatedRequestInterface and handles retries and authentication.
class RequestSender {
public:
// |auth_service| is used for fetching OAuth tokens. It'll be owned by
// this RequestSender.
//
// |url_request_context_getter| is the context used to perform network
// requests from this RequestSender.
//
// |blocking_task_runner| is used for running blocking operation, e.g.,
// parsing JSON response from the server.
//
// |custom_user_agent| will be used for the User-Agent header in HTTP
// requests issued through the request sender if the value is not empty.
RequestSender(AuthServiceInterface* auth_service,
net::URLRequestContextGetter* url_request_context_getter,
base::SequencedTaskRunner* blocking_task_runner,
const std::string& custom_user_agent);
~RequestSender();
AuthServiceInterface* auth_service() { return auth_service_.get(); }
net::URLRequestContextGetter* url_request_context_getter() const {
return url_request_context_getter_;
}
base::SequencedTaskRunner* blocking_task_runner() const {
return blocking_task_runner_.get();
}
// Starts a request implementing the AuthenticatedRequestInterface
// interface, and makes the request retry upon authentication failures by
// calling back to RetryRequest. The |request| object is owned by this
// RequestSender. It will be deleted in RequestSender's destructor or
// in RequestFinished().
//
// Returns a closure to cancel the request. The closure cancels the request
// if it is in-flight, and does nothing if it is already terminated.
base::Closure StartRequestWithRetry(AuthenticatedRequestInterface* request);
// Notifies to this RequestSender that |request| has finished.
// TODO(kinaba): refactor the life time management and make this at private.
void RequestFinished(AuthenticatedRequestInterface* request);
private:
// Called when the access token is fetched.
void OnAccessTokenFetched(
const base::WeakPtr<AuthenticatedRequestInterface>& request,
GDataErrorCode error,
const std::string& access_token);
// Clears any authentication token and retries the request, which forces
// an authentication token refresh.
void RetryRequest(AuthenticatedRequestInterface* request);
// Cancels the request. Used for implementing the returned closure of
// StartRequestWithRetry.
void CancelRequest(
const base::WeakPtr<AuthenticatedRequestInterface>& request);
scoped_ptr<AuthServiceInterface> auth_service_;
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
std::set<AuthenticatedRequestInterface*> in_flight_requests_;
const std::string custom_user_agent_;
base::ThreadChecker thread_checker_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<RequestSender> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(RequestSender);
};
} // namespace google_apis
#endif // GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_
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