SnapshotStorage.h

/*
	This file is part of cpp-ethereum.

	cpp-ethereum 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 3 of the License, or
	(at your option) any later version.

	cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <libdevcore/Common.h>
#include <libdevcore/Exceptions.h>
#include <libdevcore/FixedHash.h>

#include <boost/filesystem.hpp>

#include <memory>

namespace dev
{

namespace eth
{

DEV_SIMPLE_EXCEPTION(FailedToReadSnapshotManifestFile);
DEV_SIMPLE_EXCEPTION(FailedToReadChunkFile);
DEV_SIMPLE_EXCEPTION(ChunkIsTooBig);
DEV_SIMPLE_EXCEPTION(ChunkDataCorrupted);
DEV_SIMPLE_EXCEPTION(FailedToGetUncompressedLength);
DEV_SIMPLE_EXCEPTION(FailedToUncompressedSnapshotChunk);

class SnapshotStorageFace
{
public:
	virtual ~SnapshotStorageFace() = default;

	virtual bytes readManifest() const = 0;

    virtual std::string readCompressedChunk(h256 const& _chunkHash) const = 0;

    virtual std::string readChunk(h256 const& _chunkHash) const = 0;

    virtual void copyTo(boost::filesystem::path const& _path) const = 0;
};


std::unique_ptr<SnapshotStorageFace> createSnapshotStorage(
    boost::filesystem::path const& _snapshotDirPath);

boost::filesystem::path importedSnapshotPath(
    boost::filesystem::path const& _dataDir, h256 const& _genesisHash);
}
}