Compressed activity log database storage

chrome/browser/extensions/activity_log/fullstream_ui_policy.h

 // Copyright 2013 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 CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_
 
 #include <string>
 
 #include "chrome/browser/extensions/activity_log/activity_database.h"
 #include "chrome/browser/extensions/activity_log/activity_log_policy.h"
 
 class GURL;
 
 namespace extensions {
 
 // A policy for logging the full stream of actions, including all arguments.
 // It's mostly intended to be used in testing and analysis.
+//
+// NOTE: The FullStreamUIPolicy deliberately keeps almost all information,
+// including some data that could be privacy sensitive (full URLs including
+// incognito URLs, full headers when WebRequest is used, etc.).  It should not
+// be used during normal browsing if users care about privacy.
 class FullStreamUIPolicy : public ActivityLogDatabasePolicy {
  public:
   // For more info about these member functions, see the super class.
   explicit FullStreamUIPolicy(Profile* profile);
 
   virtual void ProcessAction(scoped_refptr<Action> action) OVERRIDE;
 
   // TODO(felt,dbabic) This is overly specific to FullStreamUIPolicy.
   // It assumes that the callback can return a sorted vector of actions.  Some
   // policies might not do that.  For instance, imagine a trivial policy that
   // just counts the frequency of certain actions within some time period,
   // this call would be meaningless, as it couldn't return anything useful.
   virtual void ReadData(
       const std::string& extension_id,
       const int day,
       const base::Callback
           <void(scoped_ptr<Action::ActionVector>)>& callback) OVERRIDE;
 
-  // Returns the actual key for a given key type
-  virtual std::string GetKey(ActivityLogPolicy::KeyType key_id) const OVERRIDE;
-
   virtual void Close() OVERRIDE;
 
   // Database table schema.
   static const char* kTableName;
   static const char* kTableContentFields[];
   static const char* kTableFieldTypes[];
   static const int kTableFieldCount;
 
  protected:
   // Only ever run by OnDatabaseClose() below; see the comments on the
   // ActivityDatabase class for an overall discussion of how cleanup works.
   virtual ~FullStreamUIPolicy();
 
-  // The ActivityDatabase::PolicyDelegate interface.  These are always called
-  // from the database thread.
+  // The ActivityDatabase::Delegate interface.  These are always called from
+  // the database thread.
   virtual bool InitDatabase(sql::Connection* db) OVERRIDE;
   virtual bool FlushDatabase(sql::Connection* db) OVERRIDE;
   virtual void OnDatabaseFailure() OVERRIDE;
   virtual void OnDatabaseClose() OVERRIDE;
 
   // Strips arguments if needed by policy.  May return the original object (if
   // unmodified), or a copy (if modifications were made).  The implementation
   // in FullStreamUIPolicy returns the action unmodified.
   virtual scoped_refptr<Action> ProcessArguments(
       scoped_refptr<Action> action) const;
 
   // Tracks any pending updates to be written to the database, if write
   // batching is turned on.  Should only be accessed from the database thread.
   Action::ActionVector queued_actions_;
 
  private:
   // Adds an Action to queued_actions_; this should be invoked only on the
   // database thread.
   void QueueAction(scoped_refptr<Action> action);
 
   // The implementation of ReadData; this must only run on the database thread.
   scoped_ptr<Action::ActionVector> DoReadData(const std::string& extension_id,
                                               const int days_ago);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_FULLSTREAM_UI_POLICY_H_