[GCM] Unregistration request

google_apis/gcm/engine/unregistration_request.h

+// Copyright 2014 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_GCM_ENGINE_UNREGISTRATION_REQUEST_H_
+#define GOOGLE_APIS_GCM_ENGINE_UNREGISTRATION_REQUEST_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "google_apis/gcm/base/gcm_export.h"
+#include "net/base/backoff_entry.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace gcm {
+
+// Unregistration request is used to revoke registration IDs for applications
+// that were uninstalled and should no longer receive GCM messages. In case an
+// attempt to unregister fails, it will retry using the backoff policy.
+// TODO(fgorski): Consider sharing code with RegistrationRequest if possible.
+class GCM_EXPORT UnregistrationRequest : public net::URLFetcherDelegate {
+ public:
+  // Callback completing the unregistration request.
+  typedef base::Callback<void(bool success)> UnregistrationCallback;
+
+  // Details of the of the Unregistration Request. All parameters are mandatory.
+  struct GCM_EXPORT RequestInfo {
+    RequestInfo(uint64 android_id,
+                uint64 security_token,
+                const std::string& app_id);
+    ~RequestInfo();
+
+    // Android ID of the device.
+    uint64 android_id;
+    // Security token of the device.
+    uint64 security_token;
+    // Application ID.
+    std::string app_id;
+  };
+
+  // Creates an instance of UnregistrationRequest. |callback| will be called
+  // once registration has been revoked or there has been an error that makes
+  // further retries pointless.
+  UnregistrationRequest(
+      const RequestInfo& request_info,
+      const net::BackoffEntry::Policy& backoff_policy,
+      const UnregistrationCallback& callback,
+      scoped_refptr<net::URLRequestContextGetter> request_context_getter);
+  virtual ~UnregistrationRequest();
+
+  // Starts an unregistration request.
+  void Start();
+
+  // URLFetcherDelegate implementation.
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
+ private:
+  // Schedules a retry attempt and informs the backoff of previous request's
+  // failure, when |update_backoff| is true.
+  void RetryWithBackoff(bool update_backoff);
+
+  UnregistrationCallback callback_;
+  RequestInfo request_info_;
+
+  net::BackoffEntry backoff_entry_;
+  scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
+  scoped_ptr<net::URLFetcher> url_fetcher_;
+
+  base::WeakPtrFactory<UnregistrationRequest> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnregistrationRequest);
+};
+
+}  // namespace gcm
+
+#endif  // GOOGLE_APIS_GCM_ENGINE_UNREGISTRATION_REQUEST_H_