google_apis/drive/request_sender.h

   1 // Copyright (c) 2012 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 GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_
   6 #define GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_
   7
   8 #include <set>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/callback_forward.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/threading/thread_checker.h"
  17 #include "google_apis/drive/gdata_errorcode.h"
  18
  19 namespace base {
  20 class SequencedTaskRunner;
  21 }
  22
  23 namespace net {
  24 class URLRequestContextGetter;
  25 }
  26
  27 namespace google_apis {
  28
  29 class AuthenticatedRequestInterface;
  30 class AuthServiceInterface;
  31
  32 // Helper class that sends requests implementing
  33 // AuthenticatedRequestInterface and handles retries and authentication.
  34 class RequestSender {
  35  public:
  36   // |auth_service| is used for fetching OAuth tokens. It'll be owned by
  37   // this RequestSender.
  38   //
  39   // |url_request_context_getter| is the context used to perform network
  40   // requests from this RequestSender.
  41   //
  42   // |blocking_task_runner| is used for running blocking operation, e.g.,
  43   // parsing JSON response from the server.
  44   //
  45   // |custom_user_agent| will be used for the User-Agent header in HTTP
  46   // requests issued through the request sender if the value is not empty.
  47   RequestSender(AuthServiceInterface* auth_service,
  48                 net::URLRequestContextGetter* url_request_context_getter,
  49                 base::SequencedTaskRunner* blocking_task_runner,
  50                 const std::string& custom_user_agent);
  51   ~RequestSender();
  52
  53   AuthServiceInterface* auth_service() { return auth_service_.get(); }
  54
  55   net::URLRequestContextGetter* url_request_context_getter() const {
  56     return url_request_context_getter_.get();
  57   }
  58
  59   base::SequencedTaskRunner* blocking_task_runner() const {
  60     return blocking_task_runner_.get();
  61   }
  62
  63   // Starts a request implementing the AuthenticatedRequestInterface
  64   // interface, and makes the request retry upon authentication failures by
  65   // calling back to RetryRequest. The |request| object is owned by this
  66   // RequestSender. It will be deleted in RequestSender's destructor or
  67   // in RequestFinished().
  68   //
  69   // Returns a closure to cancel the request. The closure cancels the request
  70   // if it is in-flight, and does nothing if it is already terminated.
  71   base::Closure StartRequestWithRetry(AuthenticatedRequestInterface* request);
  72
  73   // Notifies to this RequestSender that |request| has finished.
  74   // TODO(kinaba): refactor the life time management and make this at private.
  75   void RequestFinished(AuthenticatedRequestInterface* request);
  76
  77  private:
  78   // Called when the access token is fetched.
  79   void OnAccessTokenFetched(
  80       const base::WeakPtr<AuthenticatedRequestInterface>& request,
  81       GDataErrorCode error,
  82       const std::string& access_token);
  83
  84   // Clears any authentication token and retries the request, which forces
  85   // an authentication token refresh.
  86   void RetryRequest(AuthenticatedRequestInterface* request);
  87
  88   // Cancels the request. Used for implementing the returned closure of
  89   // StartRequestWithRetry.
  90   void CancelRequest(
  91       const base::WeakPtr<AuthenticatedRequestInterface>& request);
  92
  93   scoped_ptr<AuthServiceInterface> auth_service_;
  94   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
  95   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
  96
  97   std::set<AuthenticatedRequestInterface*> in_flight_requests_;
  98   const std::string custom_user_agent_;
  99
 100   base::ThreadChecker thread_checker_;
 101
 102   // Note: This should remain the last member so it'll be destroyed and
 103   // invalidate its weak pointers before any other members are destroyed.
 104   base::WeakPtrFactory<RequestSender> weak_ptr_factory_;
 105
 106   DISALLOW_COPY_AND_ASSIGN(RequestSender);
 107 };
 108
 109 }  // namespace google_apis
 110
 111 #endif  // GOOGLE_APIS_DRIVE_REQUEST_SENDER_H_