135 lines
5.8 KiB
Python
Executable File
135 lines
5.8 KiB
Python
Executable File
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from my_error import MyError
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import mysql.connector
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from mysql.connector import errorcode
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from actions import BaseDMLAction
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from actions import reflect_action_cls_list
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from actions import QueryCursor
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from actions import check_current_cluster_is_primary
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import logging
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import my_utils
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'''
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添加一条normal dml的方法:
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在本文件中，添加一个类名以"NormalDMLActionPost"开头并且继承自BaseDMLAction的类，
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然后在这个类中实现以下成员函数，并且每个函数执行出错都要抛错：
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(1)@staticmethod get_seq_num():
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返回一个代表着执行顺序的序列号，该序列号在本文件中不允许重复，若有重复则会报错。
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(2)dump_before_do_action(self):
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执行action sql之前把一些相关数据dump到日志中。
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(3)check_before_do_action(self):
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执行action sql之前的检查。
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(4)@staticmethod get_action_dml():
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返回action sql，并且该sql必须为dml。
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(5)@staticmethod get_rollback_sql():
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返回回滚该action的sql。
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(6)dump_after_do_action(self):
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执行action sql之后把一些相关数据dump到日志中。
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(7)check_after_do_action(self):
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执行action sql之后的检查。
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(8)skip_action(self):
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check if check_before_do_action() and do_action() can be skipped
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举例:
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class NormalDMLActionPost1(BaseDMLAction):
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@staticmethod
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def get_seq_num():
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return 0
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def dump_before_do_action(self):
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my_utils.query_and_dump_results(self._query_cursor, """select * from test.for_test""")
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def skip_action(self):
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(desc, results) = self._query_cursor.exec_query("""select * from test.for_test where pk = 9""")
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return (len(results) > 0)
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def check_before_do_action(self):
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(desc, results) = self._query_cursor.exec_query("""select * from test.for_test where pk = 9""")
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if len(results) > 0:
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raise MyError('some row in table test.for_test whose primary key is 9 already exists')
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@staticmethod
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def get_action_dml():
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return """insert into test.for_test values (9, 'haha', 99)"""
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@staticmethod
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def get_rollback_sql():
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return """delete from test.for_test where pk = 9"""
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def dump_after_do_action(self):
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my_utils.query_and_dump_results(self._query_cursor, """select * from test.for_test""")
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def check_after_do_action(self):
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(desc, results) = self._query_cursor.exec_query("""select * from test.for_test where pk = 9""")
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if len(results) != 1:
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raise MyError('there should be only one row whose primary key is 9 in table test.for_test, but there has {0} rows like that'.format(len(results)))
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elif results[0][0] != 9 or results[0][1] != 'haha' or results[0][2] != 99:
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raise MyError('the row that has been inserted is not expected, it is: [{0}]'.format(','.join(str(r) for r in results[0])))
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'''
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#升级语句对应的action要写在下面的actions begin和actions end这两行之间，
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#因为基准版本更新的时候会调用reset_upgrade_scripts.py来清空actions begin和actions end
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#这两行之间的这些action，如果不写在这两行之间的话会导致清空不掉相应的action。
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####========******####======== actions begin ========####******========####
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####========******####========= actions end =========####******========####
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def do_normal_dml_actions_by_standby_cluster(standby_cluster_infos):
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try:
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for standby_cluster_info in standby_cluster_infos:
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logging.info("do_normal_dml_actions_by_standby_cluster: cluster_id = {0}, ip = {1}, port = {2}"
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.format(standby_cluster_info['cluster_id'],
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standby_cluster_info['ip'],
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standby_cluster_info['port']))
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logging.info("create connection : cluster_id = {0}, ip = {1}, port = {2}"
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.format(standby_cluster_info['cluster_id'],
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standby_cluster_info['ip'],
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standby_cluster_info['port']))
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conn = mysql.connector.connect(user = standby_cluster_info['user'],
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password = standby_cluster_info['pwd'],
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host = standby_cluster_info['ip'],
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port = standby_cluster_info['port'],
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database = 'oceanbase',
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raise_on_warnings = True)
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cur = conn.cursor(buffered=True)
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conn.autocommit = True
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query_cur = QueryCursor(cur)
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is_primary = check_current_cluster_is_primary(query_cur)
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if is_primary:
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logging.exception("""primary cluster changed : cluster_id = {0}, ip = {1}, port = {2}"""
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.format(standby_cluster_info['cluster_id'],
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standby_cluster_info['ip'],
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standby_cluster_info['port']))
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raise e
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## process
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do_normal_dml_actions(cur)
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cur.close()
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conn.close()
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except Exception, e:
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logging.exception("""do_normal_dml_actions_by_standby_cluster failed""")
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raise e
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def do_normal_dml_actions(cur):
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import normal_dml_actions_post
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cls_list = reflect_action_cls_list(normal_dml_actions_post, 'NormalDMLActionPost')
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for cls in cls_list:
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logging.info('do normal dml acion, seq_num: %d', cls.get_seq_num())
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action = cls(cur)
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action.dump_before_do_action()
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if False == action.skip_action():
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action.check_before_do_action()
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action.do_action()
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else:
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logging.info("skip dml action, seq_num: %d", cls.get_seq_num())
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action.dump_after_do_action()
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action.check_after_do_action()
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def get_normal_dml_actions_sqls_str():
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import normal_dml_actions_post
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ret_str = ''
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cls_list = reflect_action_cls_list(normal_dml_actions_post, 'NormalDMLActionPost')
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for i in range(0, len(cls_list)):
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if i > 0:
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ret_str += '\n'
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ret_str += cls_list[i].get_action_dml() + ';'
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return ret_str
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