Quirks Client for downloading and providing display profiles

components/quirks_client/quirks_client.h

+// Copyright 2016 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 COMPONENTS_QUIRKS_CLIENT_QUIRKS_CLIENT_H_
+#define COMPONENTS_QUIRKS_CLIENT_QUIRKS_CLIENT_H_
+
+#include "base/files/file_path.h"
+#include "base/macros.h"
+#include "base/timer/timer.h"
+#include "components/quirks_client/quirks_client_export.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+class PrefRegistrySimple;
+class PrefService;
+
+namespace base {
+class SequencedWorkerPool;
+}
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace quirks_client {
+
+class QuirksClientManager;
+
+using DownloadFinishedCallback = base::Callback<void(base::FilePath)>;
+
+// Format int as hex string for filename.
+QUIRKS_CLIENT_EXPORT std::string IdToHexString(int64_t product_id);
+
+// Returns path to icc file, if it exists; creates and starts QuirksServer if
+// it doesn't.
+QUIRKS_CLIENT_EXPORT base::FilePath RequestIccProfilePath(
+    int64_t product_id,
+    const DownloadFinishedCallback& on_download_finished);
+
+// Handles providing data from icc and other display data files.  This may
+// involve downloading and storing files from the Quirks Server, or serving
+// these files from local, writable storage.
+class QuirksClient : public net::URLFetcherDelegate {
+ public:
+  enum RequestReason {
+    FIRST,  // Device's first server request.
+    RETRY,  // Has server file been added since last check?
+    UPDATE  // Has server file been updated since last check?
+  };
+
+  QuirksClient(int64_t product_id,
+               const DownloadFinishedCallback& on_download_finished,
+               QuirksClientManager* manager);
+  ~QuirksClient() override;
+
+  void StartDownload();
+
+  // Is experimental flag set to enable Quirks Client?
+  static bool IsEnabled();
+
+ private:
+  // Send callback and self delete when done.
+  void Shutdown(bool success);
+
+  // Schedules retry.
+  void Retry();
+
+  // net::URLFetcherDelegate:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+  // Write |data| to |file_path|.
+  static bool WriteIccFile(const base::FilePath file_path,
+                           const std::string& data);
+
+  // Translate json with base64-encoded data (|result|) into raw |data|.
+  bool ParseResult(const std::string& result, std::string* data);
+
+  // ID of display to request from Quirks Server.
+  const int64_t product_id_;
+
+  // Callback supplied by caller.
+  const DownloadFinishedCallback on_download_finished_;
+
+  QuirksClientManager* manager_;
+
+  // Full path to icc file.
+  const base::FilePath icc_path_;
+
+  // This fetcher is used to download icc file.
+  scoped_ptr<net::URLFetcher> url_fetcher_;
+
+  // Why are we making this server call?
+  RequestReason request_reason_;
+
+  // Pending retry.
+  base::OneShotTimer request_scheduled_;
+
+  // Number of download retries (first attempt is not counted as retry).
+  unsigned retries_;

[Bernhard Bauer, 2016/02/12 14:51:21]

You could use net::BackoffEntry for this.

[Greg Levin, 2016/02/15 21:53:52]

Done.

+
+  // Factory for callbacks.
+  base::WeakPtrFactory<QuirksClient> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuirksClient);
+};
+
+}  // namespace chromeos
+
+#endif  // COMPONENTS_QUIRKS_CLIENT_QUIRKS_CLIENT_H_