1 // Copyright 2014 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 CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 6 #define CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 7 8 #include <string> 9 10 #include "base/basictypes.h" 11 #include "base/memory/scoped_ptr.h" 12 #include "components/metrics/metrics_provider.h" 13 14 class Profile; 15 16 namespace extensions { 17 class ExtensionSet; 18 } 19 20 namespace metrics { 21 class MetricsStateManager; 22 class SystemProfileProto; 23 } 24 25 // ExtensionsMetricsProvider groups various constants and functions used for 26 // reporting extension IDs with UMA reports (after hashing the extension IDs 27 // for privacy). 28 class ExtensionsMetricsProvider : public metrics::MetricsProvider { 29 public: 30 // Holds on to |metrics_state_manager|, which must outlive this object, as a 31 // weak pointer. 32 explicit ExtensionsMetricsProvider( 33 metrics::MetricsStateManager* metrics_state_manager); 34 virtual ~ExtensionsMetricsProvider(); 35 36 // metrics::MetricsProvider: 37 virtual void ProvideSystemProfileMetrics( 38 metrics::SystemProfileProto* system_profile) OVERRIDE; 39 40 protected: 41 // Exposed for the sake of mocking in test code. 42 43 // Retrieves the set of extensions installed in the given |profile|. 44 virtual scoped_ptr<extensions::ExtensionSet> GetInstalledExtensions( 45 Profile* profile); 46 47 // Retrieves the client ID. 48 virtual uint64 GetClientID(); 49 50 // Hashes the extension extension ID using the provided client key (which 51 // must be less than kExtensionListClientKeys) and to produce an output value 52 // between 0 and kExtensionListBuckets-1. 53 static int HashExtension(const std::string& extension_id, uint32 client_key); 54 55 private: 56 // Returns the profile for which extensions will be gathered. Once a 57 // suitable profile has been found, future calls will continue to return the 58 // same value so that reported extensions are consistent. 59 Profile* GetMetricsProfile(); 60 61 // Writes whether any loaded profiles have extensions not from the webstore. 62 void ProvideOffStoreMetric(metrics::SystemProfileProto* system_profile); 63 64 // Writes the hashed list of installed extensions into the specified 65 // SystemProfileProto object. 66 void ProvideOccupiedBucketMetric(metrics::SystemProfileProto* system_profile); 67 68 // The MetricsStateManager from which the client ID is obtained. 69 metrics::MetricsStateManager* metrics_state_manager_; 70 71 // The profile for which extensions are gathered for the occupied bucket 72 // metric. Once a profile is found its value is cached here so that 73 // GetMetricsProfile() can return a consistent value. 74 Profile* cached_profile_; 75 76 DISALLOW_COPY_AND_ASSIGN(ExtensionsMetricsProvider); 77 }; 78 79 #endif // CHROME_BROWSER_METRICS_EXTENSIONS_METRICS_PROVIDER_H_ 80