UpdateFetcher.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef UpdateFetcher_h__
#define UpdateFetcher_h__

#include <DBUpdater.h>

#include <functional>
#include <string>
#include <memory>
#include <vector>

class TC_DATABASE_API UpdateFetcher
{
 typedef boost::filesystem::path Path;

public:
 UpdateFetcher(Path const& updateDirectory,
 std::function<void(std::string const&)> const& apply,
 std::function<void(Path const& path)> const& applyFile,
 std::function<QueryResult(std::string const&)> const& retrieve);

 UpdateResult Update(bool const redundancyChecks, bool const allowRehash,
 bool const archivedRedundancy, int32 const cleanDeadReferencesMaxCount) const;

private:
 enum UpdateMode
 {
 MODE_APPLY,
 MODE_REHASH
 };

 enum State
 {
 RELEASED,
 ARCHIVED
 };

 struct AppliedFileEntry
 {
 AppliedFileEntry(std::string const& name_, std::string const& hash_, State state_, uint64 timestamp_)
 : name(name_), hash(hash_), state(state_), timestamp(timestamp_) { }

 std::string const name;

 std::string const hash;

 State const state;

 uint64 const timestamp;

 static inline State StateConvert(std::string const& state)
 {
 return (state == "RELEASED") ? RELEASED : ARCHIVED;
 }

 static inline std::string StateConvert(State const state)
 {
 return (state == RELEASED) ? "RELEASED" : "ARCHIVED";
 }

 std::string GetStateAsString() const
 {
 return StateConvert(state);
 }
 };

 struct DirectoryEntry
 {
 DirectoryEntry(Path const& path_, State state_) : path(path_), state(state_) { }

 Path const path;

 State const state;
 };

 typedef std::pair<Path, State> LocaleFileEntry;

 struct PathCompare
 {
 inline bool operator() (LocaleFileEntry const& left, LocaleFileEntry const& right) const
 {
 return left.first.filename().string() < right.first.filename().string();
 }
 };

 typedef std::set<LocaleFileEntry, PathCompare> LocaleFileStorage;
 typedef std::unordered_map<std::string, std::string> HashToFileNameStorage;
 typedef std::unordered_map<std::string, AppliedFileEntry> AppliedFileStorage;
 typedef std::vector<UpdateFetcher::DirectoryEntry> DirectoryStorage;

 LocaleFileStorage GetFileList() const;
 void FillFileListRecursively(Path const& path, LocaleFileStorage& storage,
 State const state, uint32 const depth) const;

 DirectoryStorage ReceiveIncludedDirectories() const;
 AppliedFileStorage ReceiveAppliedFiles() const;

 std::string ReadSQLUpdate(Path const& file) const;
 std::string CalculateHash(std::string const& query) const;

 uint32 Apply(Path const& path) const;

 void UpdateEntry(AppliedFileEntry const& entry, uint32 const speed = 0) const;
 void RenameEntry(std::string const& from, std::string const& to) const;
 void CleanUp(AppliedFileStorage const& storage) const;

 void UpdateState(std::string const& name, State const state) const;

 Path const _sourceDirectory;

 std::function<void(std::string const&)> const _apply;
 std::function<void(Path const& path)> const _applyFile;
 std::function<QueryResult(std::string const&)> const _retrieve;
};

#endif // UpdateFetcher_h__