mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-10 09:32:06 +00:00
287 lines
8.5 KiB
Python
287 lines
8.5 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import datetime
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import logging
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import pyodbc
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import sqlite3
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import traceback
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import enum
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import random
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import string
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from contextlib import contextmanager
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from exceptions import ProgramError
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logger = logging.getLogger("connection")
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logger.setLevel(logging.DEBUG)
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class OdbcConnectingArgs:
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def __init__(self, **kwargs):
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self._kwargs = kwargs
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def __str__(self):
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conn_str = ";".join(
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["{}={}".format(x, y) for x, y in self._kwargs.items() if y]
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)
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return conn_str
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def update_database(self, database):
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self._kwargs["Database"] = database
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@staticmethod
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def create_from_kw(
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dsn="", server="localhost", user="default", database="default", **kwargs
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):
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conn_args = {
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"DSN": dsn,
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"Server": server,
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"User": user,
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"Database": database,
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}
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conn_args.update(kwargs)
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return OdbcConnectingArgs(**conn_args)
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@staticmethod
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def create_from_connection_string(conn_str):
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args = OdbcConnectingArgs()
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for kv in conn_str.split(";"):
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if kv:
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k, v = kv.split("=", 1)
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args._kwargs[k] = v
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return args
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def _random_str(length=8):
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alphabet = string.ascii_lowercase + string.digits
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return "".join(random.SystemRandom().choice(alphabet) for _ in range(length))
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def default_clickhouse_odbc_conn_str():
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return str(
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OdbcConnectingArgs.create_from_kw(
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dsn="ClickHouse DSN (ANSI)",
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Url="http://localhost:8123/query?default_format=ODBCDriver2&default_table_engine=MergeTree&union_default_mode=DISTINCT&group_by_use_nulls=1&join_use_nulls=1&allow_create_index_without_type=1",
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)
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)
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class Engines(enum.Enum):
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SQLITE = enum.auto()
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ODBC = enum.auto()
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@staticmethod
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def list():
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return list(map(lambda c: c.name.lower(), Engines))
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class KnownDBMS(str, enum.Enum):
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sqlite = "sqlite"
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clickhouse = "ClickHouse"
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class ConnectionWrap(object):
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def __init__(self, connection=None, factory=None, factory_kwargs=None):
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self._factory = factory
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self._factory_kwargs = factory_kwargs
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self._connection = connection
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self.DBMS_NAME = None
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self.DATABASE_NAME = None
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self.USER_NAME = None
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@staticmethod
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def create(connection):
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return ConnectionWrap(connection=connection)
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@staticmethod
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def create_form_factory(factory, factory_kwargs):
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return ConnectionWrap(
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factory=factory, factory_kwargs=factory_kwargs
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).reconnect()
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def can_reconnect(self):
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return self._factory is not None
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def reconnect(self):
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if self._connection is not None:
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self._connection.close()
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self._connection = self._factory(self._factory_kwargs)
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return self
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def assert_can_reconnect(self):
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assert self.can_reconnect(), f"no reconnect for: {self.DBMS_NAME}"
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def __getattr__(self, item):
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return getattr(self._connection, item)
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def __enter__(self):
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return self
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def drop_all_tables(self):
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if self.DBMS_NAME == KnownDBMS.clickhouse.value:
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list_query = (
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f"SELECT name FROM system.tables WHERE database='{self.DATABASE_NAME}'"
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)
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elif self.DBMS_NAME == KnownDBMS.sqlite.value:
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list_query = f"SELECT name FROM sqlite_master WHERE type='table'"
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else:
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logger.warning(
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"unable to drop all tables for unknown database: %s", self.DBMS_NAME
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)
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return
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list_result = execute_request(list_query, self)
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logger.info("tables will be dropped: %s", list_result.get_result())
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for table_name in list_result.get_result():
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table_name = table_name[0]
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execute_request(f"DROP TABLE {table_name}", self).assert_no_exception()
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logger.debug("success drop table: %s", table_name)
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def _use_database(self, database="default"):
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if self.DBMS_NAME == KnownDBMS.clickhouse.value:
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logger.info("use test database: %s", database)
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self._factory_kwargs.update_database(database)
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self.reconnect()
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self.DATABASE_NAME = database
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def use_random_database(self):
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if self.DBMS_NAME == KnownDBMS.clickhouse.value:
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database = f"test_{_random_str()}"
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execute_request(f"CREATE DATABASE {database}", self).assert_no_exception()
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self._use_database(database)
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logger.info(
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"currentDatabase : %s",
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execute_request(f"SELECT currentDatabase()", self).get_result(),
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)
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@contextmanager
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def with_one_test_scope(self):
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try:
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yield self
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finally:
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self.drop_all_tables()
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@contextmanager
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def with_test_database_scope(self):
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self.use_random_database()
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try:
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yield self
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finally:
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self._use_database()
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def __exit__(self, *args):
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if hasattr(self._connection, "close"):
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return self._connection.close()
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def setup_connection(engine, conn_str=None, make_debug_request=True):
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connection = None
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if isinstance(engine, str):
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engine = Engines[engine.upper()]
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if engine == Engines.ODBC:
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if conn_str is None:
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raise ProgramError("conn_str has to be set up for ODBC connection")
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logger.debug("Drivers: %s", pyodbc.drivers())
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logger.debug("DataSources: %s", pyodbc.dataSources())
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logger.debug("Connection string: %s", conn_str)
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conn_args = OdbcConnectingArgs.create_from_connection_string(conn_str)
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connection = ConnectionWrap.create_form_factory(
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factory=lambda args: pyodbc.connect(str(args)),
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factory_kwargs=conn_args,
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)
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connection.add_output_converter(pyodbc.SQL_UNKNOWN_TYPE, lambda x: None)
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connection.DBMS_NAME = connection.getinfo(pyodbc.SQL_DBMS_NAME)
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connection.DATABASE_NAME = connection.getinfo(pyodbc.SQL_DATABASE_NAME)
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connection.USER_NAME = connection.getinfo(pyodbc.SQL_USER_NAME)
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elif engine == Engines.SQLITE:
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conn_str = conn_str if conn_str is not None else ":memory:"
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connection = ConnectionWrap.create(sqlite3.connect(conn_str))
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connection.DBMS_NAME = "sqlite"
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connection.DATABASE_NAME = "main"
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connection.USER_NAME = "default"
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logger.info(
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"Connection info: DBMS name %s, database %s, user %s",
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connection.DBMS_NAME,
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connection.DATABASE_NAME,
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connection.USER_NAME,
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)
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if make_debug_request:
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request = "SELECT 1"
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logger.debug("Make debug request to the connection: %s", request)
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result = execute_request(request, connection)
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logger.debug("Debug request returned: %s", result.get_result())
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logger.debug("Connection is ok")
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return connection
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class ExecResult:
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def __init__(self):
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self._exception = None
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self._result = None
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self._description = None
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def as_exception(self, exc):
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self._exception = exc
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return self
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def get_result(self):
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self.assert_no_exception()
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return self._result
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def get_description(self):
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self.assert_no_exception()
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return self._description
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def as_ok(self, rows=None, description=None):
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if rows is None:
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self._result = True
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return self
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self._result = rows
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self._description = description
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return self
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def get_exception(self):
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return self._exception
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def has_exception(self):
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return self._exception is not None
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def assert_no_exception(self):
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if self.has_exception():
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raise ProgramError(
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f"request doesn't have a result set, it has the exception",
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parent=self._exception,
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)
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def execute_request(request, connection):
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cursor = connection.cursor()
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try:
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cursor.execute(request)
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if cursor.description:
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logging.debug("request has a description %s", cursor.description)
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rows = cursor.fetchall()
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connection.commit()
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return ExecResult().as_ok(rows=rows, description=cursor.description)
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else:
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logging.debug("request doesn't have a description")
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connection.commit()
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return ExecResult().as_ok()
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except (pyodbc.Error, sqlite3.DatabaseError) as err:
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return ExecResult().as_exception(err)
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finally:
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cursor.close()
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