1 files changed, 111 insertions, 0 deletions
diff --git a/chromium/google_apis/drive/request_sender.h b/chromium/google_apis/drive/request_sender.h
new file mode 100644
index 00000000000..dfc671c42bf
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+++ b/chromium/google_apis/drive/request_sender.h
@@ -0,0 +1,111 @@
+// 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_