ClickHouse/tests/integration/helpers/postgres_utility.py

import psycopg2
import time
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT

postgres_table_template = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key Integer NOT NULL, value Integer, PRIMARY KEY(key))
    """
postgres_table_template_2 = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key Integer NOT NULL, value1 Integer, value2 Integer, value3 Integer, PRIMARY KEY(key))
    """
postgres_table_template_3 = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key1 Integer NOT NULL, value1 Integer, key2 Integer NOT NULL, value2 Integer NOT NULL)
    """
postgres_table_template_4 = """
    CREATE TABLE IF NOT EXISTS "{}"."{}" (
    key Integer NOT NULL, value Integer, PRIMARY KEY(key))
    """
postgres_table_template_5 = """
    CREATE TABLE IF NOT EXISTS "{}" (
    key Integer NOT NULL, value UUID, PRIMARY KEY(key))
    """

def get_postgres_conn(ip, port, database=False, auto_commit=True, database_name='postgres_database', replication=False):
    if database == True:
        conn_string = f"host={ip} port={port} dbname='{database_name}' user='postgres' password='mysecretpassword'"
    else:
        conn_string = f"host={ip} port={port} user='postgres' password='mysecretpassword'"

    if replication:
        conn_string += " replication='database'"

    conn = psycopg2.connect(conn_string)
    if auto_commit:
        conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
        conn.autocommit = True
    return conn

def create_replication_slot(conn, slot_name='user_slot'):
    cursor = conn.cursor()
    cursor.execute(f'CREATE_REPLICATION_SLOT {slot_name} LOGICAL pgoutput EXPORT_SNAPSHOT')
    result = cursor.fetchall()
    print(result[0][0]) # slot name
    print(result[0][1]) # start lsn
    print(result[0][2]) # snapshot
    return result[0][2]

def drop_replication_slot(conn, slot_name='user_slot'):
    cursor = conn.cursor()
    cursor.execute(f"select pg_drop_replication_slot('{slot_name}')")


def create_postgres_schema(cursor, schema_name):
    drop_postgres_schema(cursor, schema_name)
    cursor.execute(f'CREATE SCHEMA {schema_name}')

def drop_postgres_schema(cursor, schema_name):
    cursor.execute(f'DROP SCHEMA IF EXISTS {schema_name} CASCADE')


def create_postgres_table(cursor, table_name, replica_identity_full=False, template=postgres_table_template):
    drop_postgres_table(cursor, table_name)
    cursor.execute(template.format(table_name))
    if replica_identity_full:
        cursor.execute(f'ALTER TABLE {table_name} REPLICA IDENTITY FULL;')

def drop_postgres_table(cursor, table_name):
    cursor.execute(f"""DROP TABLE IF EXISTS "{table_name}" """)


def create_postgres_table_with_schema(cursor, schema_name, table_name):
    drop_postgres_table_with_schema(cursor, schema_name, table_name)
    cursor.execute(postgres_table_template_4.format(schema_name, table_name))

def drop_postgres_table_with_schema(cursor, schema_name, table_name):
    cursor.execute(f"""DROP TABLE IF EXISTS "{schema_name}"."{table_name}" """)


class PostgresManager:
    def __init__(self):
        self.created_postgres_db_list = set()
        self.created_materialized_postgres_db_list = set()
        self.created_ch_postgres_db_list = set()

    def init(self, instance, ip, port):
        self.instance = instance
        self.ip = ip
        self.port = port
        self.conn = get_postgres_conn(ip=self.ip, port=self.port)
        self.prepare()

    def restart(self):
        try:
            self.clear()
            self.prepare()
        except Exception as ex:
            self.prepare()
            raise ex

    def prepare(self):
        conn = get_postgres_conn(ip=self.ip, port=self.port)
        cursor = conn.cursor()
        self.create_postgres_db(cursor, 'postgres_database')
        self.create_clickhouse_postgres_db(ip=self.ip, port=self.port)

    def clear(self):
        if self.conn.closed == 0:
            self.conn.close()
        for db in self.created_materialized_postgres_db_list.copy():
            self.drop_materialized_db(db);
        for db in self.created_ch_postgres_db_list.copy():
            self.drop_clickhouse_postgres_db(db)
        if len(self.created_postgres_db_list) > 0:
            conn = get_postgres_conn(ip=self.ip, port=self.port)
            cursor = conn.cursor()
            for db in self.created_postgres_db_list.copy():
                self.drop_postgres_db(cursor, db)

    def get_db_cursor(self):
        self.conn = get_postgres_conn(ip=self.ip, port=self.port, database=True)
        return self.conn.cursor()

    def create_postgres_db(self, cursor, name='postgres_database'):
        self.drop_postgres_db(cursor, name)
        self.created_postgres_db_list.add(name)
        cursor.execute(f"CREATE DATABASE {name}")

    def drop_postgres_db(self, cursor, name='postgres_database'):
        cursor.execute(f"DROP DATABASE IF EXISTS {name}")
        if name in self.created_postgres_db_list:
            self.created_postgres_db_list.remove(name)

    def create_clickhouse_postgres_db(self, ip, port, name='postgres_database', database_name='postgres_database', schema_name=''):
        self.drop_clickhouse_postgres_db(name)
        self.created_ch_postgres_db_list.add(name)

        if len(schema_name) == 0:
            self.instance.query(f'''
                    CREATE DATABASE {name}
                    ENGINE = PostgreSQL('{ip}:{port}', '{database_name}', 'postgres', 'mysecretpassword')''')
        else:
            self.instance.query(f'''
                CREATE DATABASE {name}
                ENGINE = PostgreSQL('{ip}:{port}', '{database_name}', 'postgres', 'mysecretpassword', '{schema_name}')''')

    def drop_clickhouse_postgres_db(self, name='postgres_database'):
        self.instance.query(f'DROP DATABASE IF EXISTS {name}')
        if name in self.created_ch_postgres_db_list:
            self.created_ch_postgres_db_list.remove(name)


    def create_materialized_db(self, ip, port,
                               materialized_database='test_database', postgres_database='postgres_database',
                               settings=[], table_overrides=''):
        self.created_materialized_postgres_db_list.add(materialized_database)
        self.instance.query(f"DROP DATABASE IF EXISTS {materialized_database}")

        create_query = f"CREATE DATABASE {materialized_database} ENGINE = MaterializedPostgreSQL('{ip}:{port}', '{postgres_database}', 'postgres', 'mysecretpassword')"
        if len(settings) > 0:
            create_query += " SETTINGS "
            for i in range(len(settings)):
                if i != 0:
                    create_query += ', '
                create_query += settings[i]
        create_query += table_overrides
        self.instance.query(create_query)
        assert materialized_database in self.instance.query('SHOW DATABASES')

    def drop_materialized_db(self, materialized_database='test_database'):
        self.instance.query(f'DROP DATABASE IF EXISTS {materialized_database} NO DELAY')
        if materialized_database in self.created_materialized_postgres_db_list:
            self.created_materialized_postgres_db_list.remove(materialized_database)
        assert materialized_database not in self.instance.query('SHOW DATABASES')

    def create_and_fill_postgres_table(self, table_name):
        conn = get_postgres_conn(ip=self.ip, port=self.port, database=True)
        cursor = conn.cursor()
        self.create_and_fill_postgres_table_from_cursor(cursor, table_name)

    def create_and_fill_postgres_table_from_cursor(self, cursor, table_name):
        create_postgres_table(cursor, table_name);
        self.instance.query(f"INSERT INTO postgres_database.{table_name} SELECT number, number from numbers(50)")

    def create_and_fill_postgres_tables(self, tables_num, numbers=50):
        conn = get_postgres_conn(ip=self.ip, port=self.port, database=True)
        cursor = conn.cursor()
        self.create_and_fill_postgres_tables_from_cursor(cursor, tables_num, numbers=numbers)

    def create_and_fill_postgres_tables_from_cursor(self, cursor, tables_num, numbers=50):
        for i in range(tables_num):
            table_name = f'postgresql_replica_{i}'
            create_postgres_table(cursor, table_name);
            if numbers > 0:
                self.instance.query(f"INSERT INTO postgres_database.{table_name} SELECT number, number from numbers({numbers})")


queries = [
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(0, 10000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE (value*value) % 3 = 0;',
    'UPDATE postgresql_replica_{} SET value = value - 125 WHERE key % 2 = 0;',
    "UPDATE postgresql_replica_{} SET key=key+20000 WHERE key%2=0",
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(40000, 50000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE key % 10 = 0;',
    'UPDATE postgresql_replica_{} SET value = value + 101 WHERE key % 2 = 1;',
    "UPDATE postgresql_replica_{} SET key=key+80000 WHERE key%2=1",
    'DELETE FROM postgresql_replica_{} WHERE value % 2 = 0;',
    'UPDATE postgresql_replica_{} SET value = value + 2000 WHERE key % 5 = 0;',
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(200000, 250000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE value % 3 = 0;',
    'UPDATE postgresql_replica_{} SET value = value * 2 WHERE key % 3 = 0;',
    "UPDATE postgresql_replica_{} SET key=key+500000 WHERE key%2=1",
    'INSERT INTO postgresql_replica_{} select i, i from generate_series(1000000, 1050000) as t(i);',
    'DELETE FROM postgresql_replica_{} WHERE value % 9 = 2;',
    "UPDATE postgresql_replica_{} SET key=key+10000000",
    'UPDATE postgresql_replica_{} SET value = value + 2  WHERE key % 3 = 1;',
    'DELETE FROM postgresql_replica_{} WHERE value%5 = 0;'
    ]


def assert_nested_table_is_created(instance, table_name, materialized_database='test_database', schema_name=''):
    if len(schema_name) == 0:
        table = table_name
    else:
        table = schema_name + "." + table_name

    print(f'Checking table {table} exists in {materialized_database}')
    database_tables = instance.query(f'SHOW TABLES FROM {materialized_database}')

    while table not in database_tables:
        time.sleep(0.2)
        database_tables = instance.query(f'SHOW TABLES FROM {materialized_database}')

    assert(table in database_tables)


def assert_number_of_columns(instance, expected, table_name, database_name='test_database'):
    result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")
    while (int(result) != expected):
        time.sleep(1)
        result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")
    print('Number of columns ok')


def check_tables_are_synchronized(instance, table_name, order_by='key', postgres_database='postgres_database', materialized_database='test_database', schema_name=''):
    assert_nested_table_is_created(instance, table_name, materialized_database, schema_name)

    table_path = ''
    if len(schema_name) == 0:
        table_path = f'{materialized_database}.{table_name}'
    else:
        table_path = f'{materialized_database}.`{schema_name}.{table_name}`'

    print(f"Checking table is synchronized: {table_path}")
    result_query = f'select * from {table_path} order by {order_by};'

    expected = instance.query(f'select * from {postgres_database}.{table_name} order by {order_by};')
    result = instance.query(result_query)

    for _ in range(30):
        if result == expected:
            break
        else:
            time.sleep(0.5)
        result = instance.query(result_query)

    assert(result == expected)


def check_several_tables_are_synchronized(instance, tables_num, order_by='key', postgres_database='postgres_database', materialized_database='test_database', schema_name=''):
    for i in range(tables_num):
        check_tables_are_synchronized(instance, f'postgresql_replica_{i}');