ClickHouse/src/Databases/DatabaseFactory.cpp
2021-01-23 12:05:37 +00:00

229 lines
9.5 KiB
C++

#include <Databases/DatabaseFactory.h>
#include <Databases/DatabaseAtomic.h>
#include <Databases/DatabaseDictionary.h>
#include <Databases/DatabaseLazy.h>
#include <Databases/DatabaseMemory.h>
#include <Databases/DatabaseOrdinary.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTIdentifier.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/formatAST.h>
#include <Poco/File.h>
#include <Poco/Path.h>
#include <Interpreters/Context.h>
#if !defined(ARCADIA_BUILD)
# include "config_core.h"
#endif
#if USE_MYSQL
# include <Core/MySQL/MySQLClient.h>
# include <Databases/MySQL/ConnectionMySQLSettings.h>
# include <Databases/MySQL/DatabaseConnectionMySQL.h>
# include <Databases/MySQL/MaterializeMySQLSettings.h>
# include <Databases/MySQL/DatabaseMaterializeMySQL.h>
# include <mysqlxx/Pool.h>
#endif
#if USE_MYSQL || USE_LIBPQXX
#include <Interpreters/evaluateConstantExpression.h>
#include <Common/parseAddress.h>
#endif
#if USE_LIBPQXX
#include <Databases/PostgreSQL/DatabasePostgreSQL.h> // Y_IGNORE
#include <Storages/PostgreSQL/PostgreSQLConnection.h>
#endif
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_ELEMENT_IN_AST;
extern const int BAD_ARGUMENTS;
extern const int UNKNOWN_DATABASE_ENGINE;
extern const int CANNOT_CREATE_DATABASE;
}
DatabasePtr DatabaseFactory::get(const ASTCreateQuery & create, const String & metadata_path, Context & context)
{
bool created = false;
try
{
/// Creates store/xxx/ for Atomic
Poco::File(Poco::Path(metadata_path).makeParent()).createDirectories();
/// Before 20.7 it's possible that .sql metadata file does not exist for some old database.
/// In this case Ordinary database is created on server startup if the corresponding metadata directory exists.
/// So we should remove metadata directory if database creation failed.
created = Poco::File(metadata_path).createDirectory();
DatabasePtr impl = getImpl(create, metadata_path, context);
if (impl && context.hasQueryContext() && context.getSettingsRef().log_queries)
context.getQueryContext().addQueryFactoriesInfo(Context::QueryLogFactories::Database, impl->getEngineName());
return impl;
}
catch (...)
{
Poco::File metadata_dir(metadata_path);
if (created && metadata_dir.exists())
metadata_dir.remove(true);
throw;
}
}
template <typename ValueType>
static inline ValueType safeGetLiteralValue(const ASTPtr &ast, const String &engine_name)
{
if (!ast || !ast->as<ASTLiteral>())
throw Exception("Database engine " + engine_name + " requested literal argument.", ErrorCodes::BAD_ARGUMENTS);
return ast->as<ASTLiteral>()->value.safeGet<ValueType>();
}
DatabasePtr DatabaseFactory::getImpl(const ASTCreateQuery & create, const String & metadata_path, Context & context)
{
auto * engine_define = create.storage;
const String & database_name = create.database;
const String & engine_name = engine_define->engine->name;
const UUID & uuid = create.uuid;
if (engine_name != "MySQL" && engine_name != "MaterializeMySQL" && engine_name != "Lazy" && engine_name != "PostgreSQL" && engine_define->engine->arguments)
throw Exception("Database engine " + engine_name + " cannot have arguments", ErrorCodes::BAD_ARGUMENTS);
if (engine_define->engine->parameters || engine_define->partition_by || engine_define->primary_key || engine_define->order_by ||
engine_define->sample_by || (!endsWith(engine_name, "MySQL") && engine_define->settings))
throw Exception("Database engine " + engine_name + " cannot have parameters, primary_key, order_by, sample_by, settings",
ErrorCodes::UNKNOWN_ELEMENT_IN_AST);
if (engine_name == "Ordinary")
return std::make_shared<DatabaseOrdinary>(database_name, metadata_path, context);
else if (engine_name == "Atomic")
return std::make_shared<DatabaseAtomic>(database_name, metadata_path, uuid, context);
else if (engine_name == "Memory")
return std::make_shared<DatabaseMemory>(database_name, context);
else if (engine_name == "Dictionary")
return std::make_shared<DatabaseDictionary>(database_name, context);
#if USE_MYSQL
else if (engine_name == "MySQL" || engine_name == "MaterializeMySQL")
{
const ASTFunction * engine = engine_define->engine;
if (!engine->arguments || engine->arguments->children.size() != 4)
throw Exception(
engine_name + " Database require mysql_hostname, mysql_database_name, mysql_username, mysql_password arguments.",
ErrorCodes::BAD_ARGUMENTS);
ASTs & arguments = engine->arguments->children;
arguments[1] = evaluateConstantExpressionOrIdentifierAsLiteral(arguments[1], context);
const auto & host_name_and_port = safeGetLiteralValue<String>(arguments[0], engine_name);
const auto & mysql_database_name = safeGetLiteralValue<String>(arguments[1], engine_name);
const auto & mysql_user_name = safeGetLiteralValue<String>(arguments[2], engine_name);
const auto & mysql_user_password = safeGetLiteralValue<String>(arguments[3], engine_name);
try
{
const auto & [remote_host_name, remote_port] = parseAddress(host_name_and_port, 3306);
auto mysql_pool = mysqlxx::Pool(mysql_database_name, remote_host_name, mysql_user_name, mysql_user_password, remote_port);
if (engine_name == "MySQL")
{
auto mysql_database_settings = std::make_unique<ConnectionMySQLSettings>();
mysql_database_settings->loadFromQueryContext(context);
mysql_database_settings->loadFromQuery(*engine_define); /// higher priority
return std::make_shared<DatabaseConnectionMySQL>(
context, database_name, metadata_path, engine_define, mysql_database_name, std::move(mysql_database_settings), std::move(mysql_pool));
}
MySQLClient client(remote_host_name, remote_port, mysql_user_name, mysql_user_password);
auto materialize_mode_settings = std::make_unique<MaterializeMySQLSettings>();
if (engine_define->settings)
materialize_mode_settings->loadFromQuery(*engine_define);
if (create.uuid == UUIDHelpers::Nil)
return std::make_shared<DatabaseMaterializeMySQL<DatabaseOrdinary>>(
context, database_name, metadata_path, uuid, mysql_database_name, std::move(mysql_pool), std::move(client)
, std::move(materialize_mode_settings));
else
return std::make_shared<DatabaseMaterializeMySQL<DatabaseAtomic>>(
context, database_name, metadata_path, uuid, mysql_database_name, std::move(mysql_pool), std::move(client)
, std::move(materialize_mode_settings));
}
catch (...)
{
const auto & exception_message = getCurrentExceptionMessage(true);
throw Exception("Cannot create MySQL database, because " + exception_message, ErrorCodes::CANNOT_CREATE_DATABASE);
}
}
#endif
else if (engine_name == "Lazy")
{
const ASTFunction * engine = engine_define->engine;
if (!engine->arguments || engine->arguments->children.size() != 1)
throw Exception("Lazy database require cache_expiration_time_seconds argument", ErrorCodes::BAD_ARGUMENTS);
const auto & arguments = engine->arguments->children;
const auto cache_expiration_time_seconds = safeGetLiteralValue<UInt64>(arguments[0], "Lazy");
return std::make_shared<DatabaseLazy>(database_name, metadata_path, cache_expiration_time_seconds, context);
}
#if USE_LIBPQXX
else if (engine_name == "PostgreSQL")
{
const ASTFunction * engine = engine_define->engine;
if (!engine->arguments || engine->arguments->children.size() < 4 || engine->arguments->children.size() > 5)
throw Exception(fmt::format(
"{} Database require host:port, database_name, username, password arguments "
"[, use_table_cache = 0].", engine_name),
ErrorCodes::BAD_ARGUMENTS);
ASTs & engine_args = engine->arguments->children;
for (auto & engine_arg : engine_args)
engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, context);
const auto & host_port = safeGetLiteralValue<String>(engine_args[0], engine_name);
const auto & postgres_database_name = safeGetLiteralValue<String>(engine_args[1], engine_name);
const auto & username = safeGetLiteralValue<String>(engine_args[2], engine_name);
const auto & password = safeGetLiteralValue<String>(engine_args[3], engine_name);
auto use_table_cache = 0;
if (engine->arguments->children.size() == 5)
use_table_cache = safeGetLiteralValue<UInt64>(engine_args[4], engine_name);
auto parsed_host_port = parseAddress(host_port, 5432);
/// no connection is made here
auto connection = std::make_shared<PostgreSQLConnection>(
postgres_database_name, parsed_host_port.first, parsed_host_port.second, username, password);
return std::make_shared<DatabasePostgreSQL>(
context, metadata_path, engine_define, database_name, postgres_database_name, connection, use_table_cache);
}
#endif
throw Exception("Unknown database engine: " + engine_name, ErrorCodes::UNKNOWN_DATABASE_ENGINE);
}
}