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#pragma once
#include <Disks/ObjectStorages/IMetadataStorage.h>
#include <Disks/ObjectStorages/MetadataFromDiskTransactionState.h>
#include <Disks/ObjectStorages/Web/WebObjectStorage.h>
#include <Disks/IDisk.h>
namespace DB
{
class MetadataStorageFromStaticFilesWebServer final : public IMetadataStorage
{
private:
friend class MetadataStorageFromStaticFilesWebServerTransaction;
using FileType = WebObjectStorage::FileType;
const WebObjectStorage & object_storage;
std::string root_path;
void assertExists(const std::string & path) const;
void initializeImpl(const String & uri_path, const std::unique_lock<std::shared_mutex> &) const;
public:
explicit MetadataStorageFromStaticFilesWebServer(const WebObjectStorage & object_storage_);
MetadataTransactionPtr createTransaction() override;
const std::string & getPath() const override;
bool exists(const std::string & path) const override;
bool isFile(const std::string & path) const override;
bool isDirectory(const std::string & path) const override;
uint64_t getFileSize(const String & path) const override;
std::vector<std::string> listDirectory(const std::string & path) const override;
DirectoryIteratorPtr iterateDirectory(const std::string & path) const override;
StoredObjects getStorageObjects(const std::string & path) const override;
std::string getObjectStorageRootPath() const override { return ""; }
struct stat stat(const String & /* path */) const override { return {}; }
Poco::Timestamp getLastModified(const std::string & /* path */) const override
{
/// Required by MergeTree
return {};
}
uint32_t getHardlinkCount(const std::string & /* path */) const override
{
return 1;
}
bool supportsChmod() const override { return false; }
bool supportsStat() const override { return false; }
};
class MetadataStorageFromStaticFilesWebServerTransaction final : public IMetadataTransaction
{
private:
DiskPtr disk;
const MetadataStorageFromStaticFilesWebServer & metadata_storage;
public:
explicit MetadataStorageFromStaticFilesWebServerTransaction(
const MetadataStorageFromStaticFilesWebServer & metadata_storage_)
: metadata_storage(metadata_storage_)
{}
const IMetadataStorage & getStorageForNonTransactionalReads() const override;
void createEmptyMetadataFile(const std::string & /* path */) override
{
/// No metadata, no need to create anything.
}
void createMetadataFile(const std::string & /* path */, const std::string & /* blob_name */, uint64_t /* size_in_bytes */) override
{
/// Noop
}
void createDirectory(const std::string & path) override;
void createDirectoryRecursive(const std::string & path) override;
void commit() override
{
/// Nothing to commit.
}
bool supportsChmod() const override { return false; }
};
}
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