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#pragma once
#include "clickhouse_config.h"
#include <Disks/ObjectStorages/IObjectStorage.h>
#include <shared_mutex>
namespace Poco
{
class Logger;
}
namespace DB
{
class WebObjectStorage : public IObjectStorage, WithContext
{
friend class MetadataStorageFromStaticFilesWebServer;
friend class MetadataStorageFromStaticFilesWebServerTransaction;
public:
WebObjectStorage(const String & url_, ContextPtr context_);
DataSourceDescription getDataSourceDescription() const override
{
return DataSourceDescription{
.type = DataSourceType::WebServer,
.description = url,
.is_encrypted = false,
.is_cached = false,
};
}
std::string getName() const override { return "WebObjectStorage"; }
bool exists(const StoredObject & object) const override;
std::unique_ptr<ReadBufferFromFileBase> readObject( /// NOLINT
const StoredObject & object,
const ReadSettings & read_settings = ReadSettings{},
std::optional<size_t> read_hint = {},
std::optional<size_t> file_size = {}) const override;
std::unique_ptr<ReadBufferFromFileBase> readObjects( /// NOLINT
const StoredObjects & objects,
const ReadSettings & read_settings = ReadSettings{},
std::optional<size_t> read_hint = {},
std::optional<size_t> file_size = {}) const override;
/// Open the file for write and return WriteBufferFromFileBase object.
std::unique_ptr<WriteBufferFromFileBase> writeObject( /// NOLINT
const StoredObject & object,
WriteMode mode,
std::optional<ObjectAttributes> attributes = {},
size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE,
const WriteSettings & write_settings = {}) override;
void removeObject(const StoredObject & object) override;
void removeObjects(const StoredObjects & objects) override;
void removeObjectIfExists(const StoredObject & object) override;
void removeObjectsIfExist(const StoredObjects & objects) override;
ObjectMetadata getObjectMetadata(const std::string & path) const override;
void copyObject( /// NOLINT
const StoredObject & object_from,
const StoredObject & object_to,
std::optional<ObjectAttributes> object_to_attributes = {}) override;
void shutdown() override;
void startup() override;
void applyNewSettings(
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
ContextPtr context) override;
String getObjectsNamespace() const override { return ""; }
std::unique_ptr<IObjectStorage> cloneObjectStorage(
const std::string & new_namespace,
const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix,
ContextPtr context) override;
std::string generateBlobNameForPath(const std::string & path) override { return path; }
bool isRemote() const override { return true; }
bool isReadOnly() const override { return true; }
protected:
[[noreturn]] static void throwNotAllowed();
bool exists(const std::string & path) const;
enum class FileType
{
File,
Directory
};
struct FileData
{
FileType type{};
size_t size = 0;
};
using Files = std::map<String, FileData>; /// file path -> file data
mutable Files files;
mutable std::shared_mutex metadata_mutex;
private:
void initialize(const String & path, const std::unique_lock<std::shared_mutex> &) const;
const String url;
Poco::Logger * log;
size_t min_bytes_for_seek;
};
}
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