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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SHARE_SHARE_HISTORY_H_
#define CHROME_BROWSER_SHARE_SHARE_HISTORY_H_
#include <string>
#include <vector>
#include "base/callback_list.h"
#include "base/memory/weak_ptr.h"
#include "base/supports_user_data.h"
#include "build/build_config.h"
#include "chrome/browser/share/proto/share_history_message.pb.h"
#include "components/leveldb_proto/public/proto_database.h"
class Profile;
namespace sharing {
// A ShareHistory instance stores and provides access to the history of which
// targets the user has shared to. This history is stored per-profile and
// cleared when the user clears browsing data.
class ShareHistory : public base::SupportsUserData::Data {
public:
struct Target {
std::string component_name;
int count;
};
using BackingDb = leveldb_proto::ProtoDatabase<mojom::ShareHistory>;
using GetFlatHistoryCallback = base::OnceCallback<void(std::vector<Target>)>;
static void CreateForProfile(Profile* profile);
static ShareHistory* Get(Profile* profile);
explicit ShareHistory(Profile* profile,
std::unique_ptr<BackingDb> backing_db = nullptr);
~ShareHistory() override;
virtual void AddShareEntry(const std::string& component_name);
// Returns the flattened share history. Each entry in this list contains
// the total count of shares the corresponding target has received over
// the past |window| days. It is required that |window| <= the backend's
// WINDOW value. A window of -1 means all available history.
virtual void GetFlatShareHistory(GetFlatHistoryCallback callback,
int window = -1);
virtual void Clear(const base::Time& start = base::Time(),
const base::Time& end = base::Time());
// Don't call this.
//
// TODO(ellyjones): There should be a better way to deal with this - it's used
// to deal with the fact that ShareHistory's destruction order wrt
// ShareRanking is undefined, so ShareHistory can get torn down while
// ShareRanking has a pending async call to it, after the pending call's reply
// has been posted but before the posted response has been run.
base::WeakPtr<ShareHistory> GetWeakPtr() {
return weak_factory_.GetWeakPtr();
}
protected:
// Constructor for test fakes only - this constructor leaves this object in an
// invalid state, so you had better override the public methods with their own
// implementations that don't rely on the base ones!
ShareHistory();
private:
void Init();
void OnInitDone(leveldb_proto::Enums::InitStatus status);
void OnInitialReadDone(bool ok, std::unique_ptr<mojom::ShareHistory> history);
void FlushToBackingDb();
// These two methods get or create entries in the in-memory protobuf; they do
// not actually write back to the DB.
mojom::DayShareHistory* DayShareHistoryForToday();
mojom::TargetShareHistory* TargetShareHistoryByName(
mojom::DayShareHistory* history,
const std::string& target_name);
bool init_finished_ = false;
leveldb_proto::Enums::InitStatus db_init_status_;
base::OnceClosureList post_init_callbacks_;
std::unique_ptr<BackingDb> db_;
// Cached copy of the data that resides on disk; initialization is complete
// when this has first been loaded. After that point, any changes are synced
// back to disk asynchronously, but the in-memory version is authoritative.
mojom::ShareHistory history_;
// Used so that callbacks supplied to the backing LevelDB won't call us back
// if the Profile we're attached to is destroyed while we have a pending
// callback. This *shouldn't* happen, since the LevelDB is *usually* attached
// to the Profile too, but it seems like it might be possible anyway.
base::WeakPtrFactory<ShareHistory> weak_factory_{this};
};
} // namespace sharing
#endif // CHROME_BROWSER_SHARE_SHARE_HISTORY_H_
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