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#include <Disks/ObjectStorages/Local/LocalObjectStorage.h>
#include <Disks/ObjectStorages/DiskObjectStorageCommon.h>
#include <Interpreters/Context.h>
#include <Common/filesystemHelpers.h>
#include <Common/logger_useful.h>
#include <Disks/IO/ReadBufferFromRemoteFSGather.h>
#include <Disks/IO/createReadBufferFromFileBase.h>
#include <Disks/IO/AsynchronousBoundedReadBuffer.h>
#include <IO/WriteBufferFromFile.h>
#include <IO/copyData.h>
#include <Common/getRandomASCIIString.h>
#include <filesystem>
namespace fs = std::filesystem;
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
extern const int BAD_ARGUMENTS;
extern const int CANNOT_UNLINK;
}
LocalObjectStorage::LocalObjectStorage()
: log(&Poco::Logger::get("LocalObjectStorage"))
{
data_source_description.type = DataSourceType::Local;
if (auto block_device_id = tryGetBlockDeviceId("/"); block_device_id.has_value())
data_source_description.description = *block_device_id;
else
data_source_description.description = "/";
data_source_description.is_cached = false;
data_source_description.is_encrypted = false;
}
bool LocalObjectStorage::exists(const StoredObject & object) const
{
return fs::exists(object.remote_path);
}
std::unique_ptr<ReadBufferFromFileBase> LocalObjectStorage::readObjects( /// NOLINT
const StoredObjects & objects,
const ReadSettings & read_settings,
std::optional<size_t> read_hint,
std::optional<size_t> file_size) const
{
auto modified_settings = patchSettings(read_settings);
auto global_context = Context::getGlobalContextInstance();
auto read_buffer_creator =
[=] (const std::string & file_path, size_t /* read_until_position */)
-> std::unique_ptr<ReadBufferFromFileBase>
{
return createReadBufferFromFileBase(file_path, modified_settings, read_hint, file_size);
};
switch (read_settings.remote_fs_method)
{
case RemoteFSReadMethod::read:
{
return std::make_unique<ReadBufferFromRemoteFSGather>(
std::move(read_buffer_creator), objects, modified_settings,
global_context->getFilesystemCacheLog(), /* use_external_buffer */false);
}
case RemoteFSReadMethod::threadpool:
{
auto impl = std::make_unique<ReadBufferFromRemoteFSGather>(
std::move(read_buffer_creator), objects, modified_settings,
global_context->getFilesystemCacheLog(), /* use_external_buffer */true);
auto & reader = global_context->getThreadPoolReader(FilesystemReaderType::ASYNCHRONOUS_REMOTE_FS_READER);
return std::make_unique<AsynchronousBoundedReadBuffer>(
std::move(impl), reader, read_settings,
global_context->getAsyncReadCounters(),
global_context->getFilesystemReadPrefetchesLog());
}
}
}
ReadSettings LocalObjectStorage::patchSettings(const ReadSettings & read_settings) const
{
if (!read_settings.enable_filesystem_cache)
return IObjectStorage::patchSettings(read_settings);
auto modified_settings{read_settings};
/// For now we cannot allow asynchronous reader from local filesystem when CachedObjectStorage is used.
switch (modified_settings.local_fs_method)
{
case LocalFSReadMethod::pread_threadpool:
case LocalFSReadMethod::pread_fake_async:
{
modified_settings.local_fs_method = LocalFSReadMethod::pread;
LOG_INFO(log, "Changing local filesystem read method to `pread`");
break;
}
default:
{
break;
}
}
return IObjectStorage::patchSettings(modified_settings);
}
std::unique_ptr<ReadBufferFromFileBase> LocalObjectStorage::readObject( /// NOLINT
const StoredObject & object,
const ReadSettings & read_settings,
std::optional<size_t> read_hint,
std::optional<size_t> file_size) const
{
const auto & path = object.remote_path;
if (!file_size)
file_size = tryGetSizeFromFilePath(path);
LOG_TEST(log, "Read object: {}", path);
return createReadBufferFromFileBase(path, patchSettings(read_settings), read_hint, file_size);
}
std::unique_ptr<WriteBufferFromFileBase> LocalObjectStorage::writeObject( /// NOLINT
const StoredObject & object,
WriteMode mode,
std::optional<ObjectAttributes> /* attributes */,
size_t buf_size,
const WriteSettings & /* write_settings */)
{
if (mode != WriteMode::Rewrite)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "LocalObjectStorage doesn't support append to files");
LOG_TEST(log, "Write object: {}", object.remote_path);
return std::make_unique<WriteBufferFromFile>(object.remote_path, buf_size);
}
void LocalObjectStorage::removeObject(const StoredObject & object)
{
/// For local object storage files are actually removed when "metadata" is removed.
if (!exists(object))
return;
if (0 != unlink(object.remote_path.data()))
throwFromErrnoWithPath("Cannot unlink file " + object.remote_path, object.remote_path, ErrorCodes::CANNOT_UNLINK);
}
void LocalObjectStorage::removeObjects(const StoredObjects & objects)
{
for (const auto & object : objects)
removeObject(object);
}
void LocalObjectStorage::removeObjectIfExists(const StoredObject & object)
{
if (exists(object))
removeObject(object);
}
void LocalObjectStorage::removeObjectsIfExist(const StoredObjects & objects)
{
for (const auto & object : objects)
removeObjectIfExists(object);
}
ObjectMetadata LocalObjectStorage::getObjectMetadata(const std::string & /* path */) const
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Metadata is not supported for LocalObjectStorage");
}
void LocalObjectStorage::copyObject( // NOLINT
const StoredObject & object_from, const StoredObject & object_to, std::optional<ObjectAttributes> /* object_to_attributes */)
{
auto in = readObject(object_from);
auto out = writeObject(object_to, WriteMode::Rewrite);
copyData(*in, *out);
out->finalize();
}
void LocalObjectStorage::shutdown()
{
}
void LocalObjectStorage::startup()
{
}
std::unique_ptr<IObjectStorage> LocalObjectStorage::cloneObjectStorage(
const std::string & /* new_namespace */,
const Poco::Util::AbstractConfiguration & /* config */,
const std::string & /* config_prefix */, ContextPtr /* context */)
{
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "cloneObjectStorage() is not implemented for LocalObjectStorage");
}
void LocalObjectStorage::applyNewSettings(
const Poco::Util::AbstractConfiguration & /* config */, const std::string & /* config_prefix */, ContextPtr /* context */)
{
}
std::string LocalObjectStorage::generateBlobNameForPath(const std::string & /* path */)
{
constexpr size_t key_name_total_size = 32;
return getRandomASCIIString(key_name_total_size);
}
}
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