ClickHouse/tests/clickhouse-test

#!/usr/bin/env python3

# pylint: disable=too-many-return-statements
# pylint: disable=global-variable-not-assigned

import enum
import shutil
import sys
import os
import os.path
import signal
import re
import copy
import traceback
import math
# Not requests, to avoid requiring extra dependency.
import http.client
import urllib.parse
import json
# for crc32
import zlib

from argparse import ArgumentParser
from typing import Tuple, Union, Optional, Dict, Set, List
import subprocess
from subprocess import Popen
from subprocess import PIPE
from datetime import datetime
from time import time, sleep
from errno import ESRCH

try:
    import termcolor
except ImportError:
    termcolor = None

import random
import string
import multiprocessing
import socket
from contextlib import closing

USE_JINJA = True
try:
    import jinja2
except ImportError:
    USE_JINJA = False
    print('WARNING: jinja2 not installed! Template tests will be skipped.')

MESSAGES_TO_RETRY = [
    "ConnectionPoolWithFailover: Connection failed at try",
    "DB::Exception: New table appeared in database being dropped or detached. Try again",
    "is already started to be removing by another replica right now",
    "DB::Exception: Cannot enqueue query",
    "environment: line 1: wait_for: No record of process", # Something weird from bash internals, let's just retry
    "is executing longer than distributed_ddl_task_timeout" # FIXME
]

MAX_RETRIES = 3

TEST_FILE_EXTENSIONS = ['.sql', '.sql.j2', '.sh', '.py', '.expect']

VERSION_PATTERN = r"^((\d+\.)?(\d+\.)?(\d+\.)?\d+)$"


def stringhash(s):
    # default hash() function consistent
    # only during process invocation https://stackoverflow.com/a/42089311
    return zlib.crc32(s.encode('utf-8'))


class HTTPError(Exception):
    def __init__(self, message=None, code=None):
        self.message = message
        self.code = code
        super().__init__(message)

    def __str__(self):
        return 'Code: {}. {}'.format(self.code, self.message)

# Helpers to execute queries via HTTP interface.
def clickhouse_execute_http(base_args, query, timeout=30, settings=None, default_format=None):
    client = http.client.HTTPConnection(
        host=base_args.tcp_host,
        port=base_args.http_port,
        timeout=timeout)

    timeout = int(timeout)
    params = {
        'query': query,

        # hung check in stress tests may remove the database,
        # hence we should use 'system'.
        'database': 'system',

        'connect_timeout': timeout,
        'receive_timeout': timeout,
        'send_timeout': timeout,

        'http_connection_timeout': timeout,
        'http_receive_timeout': timeout,
        'http_send_timeout': timeout,
    }
    if settings is not None:
        params.update(settings)
    if default_format is not None:
        params['default_format'] = default_format

    client.request('POST', '/?' + base_args.client_options_query_str + urllib.parse.urlencode(params))
    res = client.getresponse()
    data = res.read()
    if res.status != 200:
        raise HTTPError(data.decode(), res.status)

    return data

def clickhouse_execute(base_args, query, timeout=30, settings=None):
    return clickhouse_execute_http(base_args, query, timeout, settings).strip()

def clickhouse_execute_json(base_args, query, timeout=60, settings=None):
    data = clickhouse_execute_http(base_args, query, timeout, settings, 'JSONEachRow')
    if not data:
        return None
    rows = []
    for row in data.strip().splitlines():
        rows.append(json.loads(row))
    return rows


class Terminated(KeyboardInterrupt):
    pass

def signal_handler(sig, frame):
    raise Terminated(f'Terminated with {sig} signal')

def stop_tests():
    global stop_tests_triggered_lock
    global stop_tests_triggered
    global restarted_tests

    with stop_tests_triggered_lock:
        print("Stopping tests")
        if not stop_tests_triggered.is_set():
            stop_tests_triggered.set()

            # materialize multiprocessing.Manager().list() object before
            # sending SIGTERM since this object is a proxy, that requires
            # communicating with manager thread, but after SIGTERM will be
            # send, this thread will die, and you will get
            # ConnectionRefusedError error for any access to "restarted_tests"
            # variable.
            restarted_tests = [*restarted_tests]

            # send signal to all processes in group to avoid hung check triggering
            # (to avoid terminating clickhouse-test itself, the signal should be ignored)
            signal.signal(signal.SIGTERM, signal.SIG_IGN)
            os.killpg(os.getpgid(os.getpid()), signal.SIGTERM)
            signal.signal(signal.SIGTERM, signal.SIG_DFL)


def get_db_engine(args, database_name):
    if args.replicated_database:
        return f" ON CLUSTER test_cluster_database_replicated \
            ENGINE=Replicated('/test/clickhouse/db/{database_name}', \
            '{{shard}}', '{{replica}}')"
    if args.db_engine:
        return " ENGINE=" + args.db_engine
    return ""   # Will use default engine


def get_zookeeper_session_uptime(args):
    try:
        if args.replicated_database:
            return int(clickhouse_execute(args, """
            SELECT min(materialize(zookeeperSessionUptime()))
            FROM clusterAllReplicas('test_cluster_database_replicated', system.one)
            """))
        else:
            return int(clickhouse_execute(args, 'SELECT zookeeperSessionUptime()'))
    except:
        return None


def need_retry(args, stdout, stderr, total_time):
    if args.check_zookeeper_session:
        # Sometimes we may get unexpected exception like "Replica is readonly" or "Shutdown is called for table"
        # instead of "Session expired" or "Connection loss"
        # Retry if session was expired during test execution.
        # If ZooKeeper is configured, then it's more reliable than checking stderr,
        # but the following condition is always true if ZooKeeper is not configured.
        session_uptime = get_zookeeper_session_uptime(args)
        if session_uptime is not None and session_uptime < math.ceil(total_time):
            return True
    return any(msg in stdout for msg in MESSAGES_TO_RETRY) or any(msg in stderr for msg in MESSAGES_TO_RETRY)


def get_processlist(args):
    if args.replicated_database:
        return clickhouse_execute_json(args, """
        SELECT materialize((hostName(), tcpPort())) as host, *
        FROM clusterAllReplicas('test_cluster_database_replicated', system.processes)
        WHERE query NOT LIKE '%system.processes%'
        """)
    else:
        return clickhouse_execute_json(args, 'SHOW PROCESSLIST')


def get_processlist_after_test(args):
    log_comment = args.testcase_basename
    database = args.testcase_database
    if args.replicated_database:
        return clickhouse_execute_json(args, f"""
        SELECT materialize((hostName(), tcpPort())) as host, *
        FROM clusterAllReplicas('test_cluster_database_replicated', system.processes)
        WHERE
            query NOT LIKE '%system.processes%' AND
            Settings['log_comment'] = '{log_comment}' AND
            current_database = '{database}'
        """)
    else:
        return clickhouse_execute_json(args, f"""
        SELECT *
        FROM system.processes
        WHERE
            query NOT LIKE '%system.processes%' AND
            Settings['log_comment'] = '{log_comment}' AND
            current_database = '{database}'
        """)


# collect server stacktraces using gdb
def get_stacktraces_from_gdb(server_pid):
    try:
        cmd = f"gdb -batch -ex 'thread apply all backtrace' -p {server_pid}"
        return subprocess.check_output(cmd, shell=True).decode('utf-8')
    except Exception as e:
        print(f"Error occurred while receiving stack traces from gdb: {e}")
        return None


# collect server stacktraces from system.stack_trace table
# it does not work in Sandbox
def get_stacktraces_from_clickhouse(args):
    settings_str = ' '.join([
        get_additional_client_options(args),
        '--allow_introspection_functions=1',
        '--skip_unavailable_shards=1',
    ])
    replicated_msg = \
        "{} {} --query \
        \"SELECT materialize((hostName(), tcpPort())) as host, thread_id, \
        arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), \
        arrayMap(x -> addressToLine(x), trace), \
        arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace \
        FROM clusterAllReplicas('test_cluster_database_replicated', 'system.stack_trace') \
        ORDER BY host, thread_id FORMAT Vertical\"".format(args.client, settings_str)

    msg = \
        "{} {} --query \
        \"SELECT arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), \
        arrayMap(x -> addressToLine(x), trace), \
        arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace \
        FROM system.stack_trace FORMAT Vertical\"".format(args.client, settings_str)

    try:
        return subprocess.check_output(
            replicated_msg if args.replicated_database else msg,
            shell=True, stderr=subprocess.STDOUT).decode('utf-8')
    except Exception as e:
        print(f"Error occurred while receiving stack traces from client: {e}")
        return None


def print_stacktraces() -> None:
    server_pid = get_server_pid()

    bt = None

    if server_pid and not args.replicated_database:
        print("")
        print(f"Located ClickHouse server process {server_pid} listening at TCP port {args.tcp_port}")
        print("Collecting stacktraces from all running threads with gdb:")

        bt = get_stacktraces_from_gdb(server_pid)

        if len(bt) < 1000:
            print("Got suspiciously small stacktraces: ", bt)
            bt = None

    if bt is None:
        print("\nCollecting stacktraces from system.stacktraces table:")

        bt = get_stacktraces_from_clickhouse(args)

    if bt is not None:
        print(bt)
        return

    print(colored(
        f"\nUnable to locate ClickHouse server process listening at TCP port {args.tcp_port}. "
         "It must have crashed or exited prematurely!",
        args, "red", attrs=["bold"]))


def get_server_pid():
    # lsof does not work in stress tests for some reason
    cmd_lsof = f"lsof -i tcp:{args.tcp_port} -s tcp:LISTEN -Fp | awk '/^p[0-9]+$/{{print substr($0, 2)}}'"
    cmd_pidof = "pidof -s clickhouse-server"

    commands = [cmd_lsof, cmd_pidof]
    output = None

    for cmd in commands:
        try:
            output = subprocess.check_output(cmd, shell=True, stderr=subprocess.STDOUT, universal_newlines=True)
            if output:
                return int(output)
        except Exception as e:
            print(f"Cannot get server pid with {cmd}, got {output}: {e}")

    return None  # most likely server is dead


def colored(text, args, color=None, on_color=None, attrs=None):
    if termcolor and (sys.stdout.isatty() or args.force_color):
        return termcolor.colored(text, color, on_color, attrs)
    else:
        return text


class TestStatus(enum.Enum):
    FAIL = "FAIL"
    UNKNOWN = "UNKNOWN"
    OK = "OK"
    SKIPPED = "SKIPPED"


class FailureReason(enum.Enum):
    # FAIL reasons
    TIMEOUT = "Timeout!"
    SERVER_DIED = "server died"
    EXIT_CODE = "return code: "
    STDERR = "having stderror: "
    EXCEPTION = "having having exception in stdout: "
    RESULT_DIFF = "result differs with reference: "
    TOO_LONG = "Test runs too long (> 60s). Make it faster."
    INTERNAL_QUERY_FAIL = "Internal query (CREATE/DROP DATABASE) failed:"

    # SKIPPED reasons
    DISABLED = "disabled"
    SKIP = "skip"
    NO_JINJA = "no jinja"
    NO_ZOOKEEPER = "no zookeeper"
    NO_SHARD = "no shard"
    FAST_ONLY = "running fast tests only"
    NO_LONG = "not running long tests"
    REPLICATED_DB = "replicated-database"
    S3_STORAGE = "s3-storage"
    BUILD = "not running for current build"
    BACKWARD_INCOMPATIBLE = "test is backward incompatible"

    # UNKNOWN reasons
    NO_REFERENCE = "no reference file"
    INTERNAL_ERROR = "Test internal error: "


class SettingsRandomizer:
    settings = {
        "max_insert_threads": lambda: 0 if random.random() < 0.5 else random.randint(1, 16),
        "group_by_two_level_threshold": lambda: 1 if random.random() < 0.1 else 2 ** 60 if random.random() < 0.11 else 100000,
        "group_by_two_level_threshold_bytes": lambda: 1 if random.random() < 0.1 else 2 ** 60 if random.random() < 0.11 else 50000000,
        "distributed_aggregation_memory_efficient": lambda: random.randint(0, 1),
        "fsync_metadata": lambda: random.randint(0, 1),
        "priority": lambda: min(3, int(abs(random.gauss(0, 2)))),
        "output_format_parallel_formatting": lambda: random.randint(0, 1),
        "input_format_parallel_parsing": lambda: random.randint(0, 1),
        "min_chunk_bytes_for_parallel_parsing": lambda: max(1024, int(random.gauss(10 * 1024 * 1024, 5 * 1000 * 1000))),
        "max_read_buffer_size": lambda: random.randint(500000, 1048576),
        "prefer_localhost_replica": lambda: random.randint(0, 1),
        "max_block_size": lambda: random.randint(8000, 100000),
        "max_threads": lambda: random.randint(1, 64),
    }

    @staticmethod
    def get_random_settings():
        random_settings = []
        for setting, generator in SettingsRandomizer.settings.items():
            random_settings.append(setting + "=" + str(generator()) + "")
        return random_settings


class TestResult:
    def __init__(self, case_name: str, status: TestStatus, reason: Optional[FailureReason], total_time: float, description: str):
        self.case_name: str = case_name
        self.status: TestStatus = status
        self.reason: Optional[FailureReason] = reason
        self.total_time: float = total_time
        self.description: str = description
        self.need_retry: bool = False

    def check_if_need_retry(self, args, stdout, stderr, runs_count):
        if self.status != TestStatus.FAIL:
            return
        if not need_retry(args, stdout, stderr, self.total_time):
            return
        if MAX_RETRIES < runs_count:
            return
        self.need_retry = True


class TestCase:
    @staticmethod
    def get_description_from_exception_info(exc_info):
        exc_type, exc_value, tb = exc_info
        exc_name = exc_type.__name__
        traceback_str = "\n".join(traceback.format_tb(tb, 10))
        description = f"\n{exc_name}\n{exc_value}\n{traceback_str}"
        return description

    @staticmethod
    def get_reference_file(suite_dir, name):
        """
        Returns reference file name for specified test
        """

        name = removesuffix(name, ".gen")
        for ext in ['.reference', '.gen.reference']:
            reference_file = os.path.join(suite_dir, name) + ext
            if os.path.isfile(reference_file):
                return reference_file
        return None

    @staticmethod
    def configure_testcase_args(args, case_file, suite_tmp_dir):
        testcase_args = copy.deepcopy(args)

        testcase_args.testcase_start_time = datetime.now()
        testcase_basename = os.path.basename(case_file)
        testcase_args.testcase_client = f"{testcase_args.client} --log_comment '{testcase_basename}'"
        testcase_args.testcase_basename = testcase_basename

        if testcase_args.database:
            database = testcase_args.database
            os.environ.setdefault("CLICKHOUSE_DATABASE", database)
            os.environ.setdefault("CLICKHOUSE_TMP", suite_tmp_dir)
        else:
            # If --database is not specified, we will create temporary database with unique name
            # And we will recreate and drop it for each test
            def random_str(length=6):
                alphabet = string.ascii_lowercase + string.digits
                # NOTE: it is important not to use default random generator, since it shares state.
                return ''.join(random.SystemRandom().choice(alphabet) for _ in range(length))

            database = 'test_{suffix}'.format(suffix=random_str())

            clickhouse_execute(args, "CREATE DATABASE " + database + get_db_engine(testcase_args, database), settings={
                'log_comment': testcase_args.testcase_basename,
            })

            os.environ["CLICKHOUSE_DATABASE"] = database
            # Set temporary directory to match the randomly generated database,
            # because .sh tests also use it for temporary files and we want to avoid
            # collisions.
            testcase_args.test_tmp_dir = os.path.join(suite_tmp_dir, database)
            os.mkdir(testcase_args.test_tmp_dir)
            os.environ.setdefault("CLICKHOUSE_TMP", testcase_args.test_tmp_dir)

        testcase_args.testcase_database = database

        return testcase_args

    def add_random_settings(self, args, client_options):
        if self.tags and 'no-random-settings' in self.tags:
            return client_options
        if args.no_random_settings:
            return client_options

        if len(self.base_url_params) == 0:
            os.environ['CLICKHOUSE_URL_PARAMS'] = '&'.join(self.random_settings)
        else:
            os.environ['CLICKHOUSE_URL_PARAMS'] = self.base_url_params + '&' + '&'.join(self.random_settings)

        new_options = " --allow_repeated_settings --" + " --".join(self.random_settings)
        os.environ['CLICKHOUSE_CLIENT_OPT'] = self.base_client_options + new_options + ' '
        return client_options + new_options

    def remove_random_settings_from_env(self):
        os.environ['CLICKHOUSE_URL_PARAMS'] = self.base_url_params
        os.environ['CLICKHOUSE_CLIENT_OPT'] = self.base_client_options

    def add_info_about_settings(self, args, description):
        if self.tags and 'no-random-settings' in self.tags:
            return description
        if args.no_random_settings:
            return description

        return description + "\n" + "Settings used in the test: " + "--" + " --".join(self.random_settings) + "\n"

    def __init__(self, suite, case: str, args, is_concurrent: bool):
        self.case: str = case   # case file name
        self.tags: Set[str] = suite.all_tags[case] if case in suite.all_tags else set()

        for tag in os.getenv("GLOBAL_TAGS", "").split(","):
            self.tags.add(tag.strip())

        self.case_file: str = os.path.join(suite.suite_path, case)
        (self.name, self.ext) = os.path.splitext(case)

        file_suffix = ('.' + str(os.getpid())) if is_concurrent and args.test_runs > 1 else ''
        self.reference_file = self.get_reference_file(suite.suite_path, self.name)
        self.stdout_file = os.path.join(suite.suite_tmp_path, self.name) + file_suffix + '.stdout'
        self.stderr_file = os.path.join(suite.suite_tmp_path, self.name) + file_suffix + '.stderr'

        self.testcase_args = None
        self.runs_count = 0

        self.random_settings = SettingsRandomizer.get_random_settings()
        self.base_url_params = os.environ['CLICKHOUSE_URL_PARAMS'] if 'CLICKHOUSE_URL_PARAMS' in os.environ else ''
        self.base_client_options = os.environ['CLICKHOUSE_CLIENT_OPT'] if 'CLICKHOUSE_CLIENT_OPT' in os.environ else ''

    # Check if test contains tag "no-backward-compatibility-check" and we should skip it
    def check_backward_incompatible_tag(self) -> bool:
        for tag in self.tags:
            if tag.startswith("no-backward-compatibility-check"):
                split = tag.split(':')

                # If version is not specified in tag, always skip this test.
                if len(split) == 1:
                    return True
                version_from_tag = split[1]

                # Check if extracted string from tag is a real ClickHouse version, if not - always skip test.
                if re.match(VERSION_PATTERN, version_from_tag) is None:
                    return True

                server_version = str(clickhouse_execute(args, "SELECT version()").decode())
                # If server version is less or equal from the version specified in tag, we should skip this test.
                version_from_tag_split = list(map(int, version_from_tag.split('.')))
                server_version_split = list(map(int, server_version.split('.')))
                if server_version_split[:len(version_from_tag_split)] <= version_from_tag_split:
                    return True

        return False

    # should skip test, should increment skipped_total, skip reason
    def should_skip_test(self, suite) -> Optional[FailureReason]:
        tags = self.tags

        if tags and ('disabled' in tags) and not args.disabled:
            return FailureReason.DISABLED

        elif os.path.exists(os.path.join(suite.suite_path, self.name) + '.disabled') and not args.disabled:
            return FailureReason.DISABLED

        elif args.skip and any(s in self.name for s in args.skip):
            return FailureReason.SKIP

        elif not USE_JINJA and self.ext.endswith("j2"):
            return FailureReason.NO_JINJA

        elif tags and (('zookeeper' in tags) or ('replica' in tags)) and not args.zookeeper:
            return FailureReason.NO_ZOOKEEPER

        elif tags and (('shard' in tags) or ('distributed' in tags) or ('global' in tags)) and not args.shard:
            return FailureReason.NO_SHARD

        elif tags and ('no-fasttest' in tags) and args.fast_tests_only:
            return FailureReason.FAST_ONLY

        elif tags and (('long' in tags) or ('deadlock' in tags) or ('race' in tags)) and args.no_long:
            # Tests for races and deadlocks usually are run in a loop for a significant amount of time
            return FailureReason.NO_LONG

        elif tags and ('no-replicated-database' in tags) and args.replicated_database:
            return FailureReason.REPLICATED_DB

        elif args.backward_compatibility_check and self.check_backward_incompatible_tag():
            return FailureReason.BACKWARD_INCOMPATIBLE

        elif tags and ('no-s3-storage' in tags) and args.s3_storage:
            return FailureReason.S3_STORAGE

        elif tags:
            for build_flag in args.build_flags:
                if 'no-' + build_flag in tags:
                    return FailureReason.BUILD
            for tag in tags:
                tag = tag.replace('-', '_')
                if tag.startswith('use_') and tag not in args.build_flags:
                    return FailureReason.BUILD

        return None

    def process_result_impl(self, proc, stdout: str, stderr: str, total_time: float):
        description = ""

        if proc:
            if proc.returncode is None:
                try:
                    proc.kill()
                except OSError as e:
                    if e.errno != ESRCH:
                        raise

                if stderr:
                    description += stderr
                return TestResult(self.name, TestStatus.FAIL, FailureReason.TIMEOUT, total_time, description)

            if proc.returncode != 0:
                reason = FailureReason.EXIT_CODE
                description += str(proc.returncode)

                if stderr:
                    description += "\n"
                    description += stderr

                # Stop on fatal errors like segmentation fault. They are sent to client via logs.
                if ' <Fatal> ' in stderr:
                    reason = FailureReason.SERVER_DIED

                if self.testcase_args.stop \
                        and ('Connection refused' in stderr or 'Attempt to read after eof' in stderr) \
                        and 'Received exception from server' not in stderr:
                    reason = FailureReason.SERVER_DIED

                if os.path.isfile(self.stdout_file):
                    description += ", result:\n\n"
                    description += '\n'.join(open(self.stdout_file).read().splitlines()[:100])
                    description += '\n'

                description += "\nstdout:\n{}\n".format(stdout)
                return TestResult(self.name, TestStatus.FAIL, reason, total_time, description)

        if stderr:
            description += "\n{}\n".format('\n'.join(stderr.splitlines()[:100]))
            description += "\nstdout:\n{}\n".format(stdout)
            return TestResult(self.name, TestStatus.FAIL, FailureReason.STDERR, total_time, description)

        if 'Exception' in stdout:
            description += "\n{}\n".format('\n'.join(stdout.splitlines()[:100]))
            return TestResult(self.name, TestStatus.FAIL, FailureReason.EXCEPTION, total_time, description)

        if '@@SKIP@@' in stdout:
            skip_reason = stdout.replace('@@SKIP@@', '').rstrip("\n")
            description += " - "
            description += skip_reason
            return TestResult(self.name, TestStatus.SKIPPED, FailureReason.SKIP, total_time, description)

        if self.reference_file is None:
            return TestResult(self.name, TestStatus.UNKNOWN, FailureReason.NO_REFERENCE, total_time, description)

        result_is_different = subprocess.call(['diff', '-q', self.reference_file, self.stdout_file], stdout=PIPE)

        if result_is_different:
            diff = Popen(['diff', '-U', str(self.testcase_args.unified), self.reference_file, self.stdout_file], stdout=PIPE,
                         universal_newlines=True).communicate()[0]
            description += "\n{}\n".format(diff)
            return TestResult(self.name, TestStatus.FAIL, FailureReason.RESULT_DIFF, total_time, description)

        if self.testcase_args.test_runs > 1 and total_time > 60 and 'long' not in self.tags:
            # We're in Flaky Check mode, check the run time as well while we're at it.
            return TestResult(self.name, TestStatus.FAIL, FailureReason.TOO_LONG, total_time, description)

        if os.path.exists(self.stdout_file):
            os.remove(self.stdout_file)
        if os.path.exists(self.stderr_file):
            os.remove(self.stderr_file)

        return TestResult(self.name, TestStatus.OK, None, total_time, description)

    @staticmethod
    def print_test_time(test_time) -> str:
        if args.print_time:
            return " {0:.2f} sec.".format(test_time)
        else:
            return ''

    def process_result(self, result: TestResult, messages):
        description_full = messages[result.status]
        description_full += self.print_test_time(result.total_time)
        if result.reason is not None:
            description_full += " - "
            description_full += result.reason.value

        description_full += result.description
        description_full += "\n"

        if result.status == TestStatus.FAIL:
            description_full += 'Database: ' + self.testcase_args.testcase_database

        result.description = description_full
        return result

    @staticmethod
    def send_test_name_failed(suite: str, case: str) -> bool:
        pid = os.getpid()
        clickhouse_execute(args, f"SELECT 'Running test {suite}/{case} from pid={pid}'")

    def run_single_test(self, server_logs_level, client_options):
        args = self.testcase_args
        client = args.testcase_client
        start_time = args.testcase_start_time
        database = args.testcase_database

        # This is for .sh tests
        os.environ["CLICKHOUSE_LOG_COMMENT"] = args.testcase_basename

        params = {
            'client': client + ' --database=' + database,
            'logs_level': server_logs_level,
            'options': client_options,
            'test': self.case_file,
            'stdout': self.stdout_file,
            'stderr': self.stderr_file,
        }

        # >> append to stderr (but not stdout since it is not used there),
        # because there are also output of per test database creation
        if not args.database:
            pattern = '{test} > {stdout} 2> {stderr}'
        else:
            pattern = '{test} > {stdout} 2> {stderr}'

        if self.ext == '.sql':
            pattern = "{client} --send_logs_level={logs_level} --multiquery {options} < " + pattern

        command = pattern.format(**params)

        proc = Popen(command, shell=True, env=os.environ)

        while (datetime.now() - start_time).total_seconds() < args.timeout and proc.poll() is None:
            sleep(0.01)

        need_drop_database = not args.database
        if need_drop_database and args.no_drop_if_fail:
            maybe_passed = (proc.returncode == 0) and (proc.stderr is None) and (
                        proc.stdout is None or 'Exception' not in proc.stdout)
            need_drop_database = not maybe_passed

        left_queries_check = args.no_left_queries_check is False
        if self.tags and 'no-left-queries-check' in self.tags:
            left_queries_check = False
        if left_queries_check:
            processlist = get_processlist_after_test(args)
            if processlist:
                print(colored(f"\nFound queries left in processlist after running {args.testcase_basename} (database={database}):", args, "red", attrs=["bold"]))
                print(json.dumps(processlist, indent=4))
                exit_code.value = 1

        if need_drop_database:
            seconds_left = max(args.timeout - (datetime.now() - start_time).total_seconds(), 20)
            try:
                clickhouse_execute(args, "DROP DATABASE " + database, timeout=seconds_left, settings={
                    'log_comment': args.testcase_basename,
                })
            except socket.timeout:
                total_time = (datetime.now() - start_time).total_seconds()
                return None, "", f"Timeout dropping database {database} after test", total_time
            shutil.rmtree(args.test_tmp_dir)

        total_time = (datetime.now() - start_time).total_seconds()

        # Normalize randomized database names in stdout, stderr files.
        os.system("LC_ALL=C sed -i -e 's/{test_db}/default/g' {file}".format(test_db=database, file=self.stdout_file))
        if args.hide_db_name:
            os.system(
                "LC_ALL=C sed -i -e 's/{test_db}/default/g' {file}".format(test_db=database, file=self.stderr_file))
        if args.replicated_database:
            os.system("LC_ALL=C sed -i -e 's|/auto_{{shard}}||g' {file}".format(file=self.stdout_file))
            os.system("LC_ALL=C sed -i -e 's|auto_{{replica}}||g' {file}".format(file=self.stdout_file))

        # Normalize hostname in stdout file.
        os.system("LC_ALL=C sed -i -e 's/{hostname}/localhost/g' {file}".format(hostname=socket.gethostname(),
                                                                                file=self.stdout_file))

        stdout = open(self.stdout_file, 'rb').read() if os.path.exists(self.stdout_file) else b''
        stdout = str(stdout, errors='replace', encoding='utf-8')
        stderr = open(self.stderr_file, 'rb').read() if os.path.exists(self.stderr_file) else b''
        stderr = str(stderr, errors='replace', encoding='utf-8')

        return proc, stdout, stderr, total_time

    def run(self, args, suite, client_options, server_logs_level):
        try:
            skip_reason = self.should_skip_test(suite)
            if skip_reason is not None:
                return TestResult(self.name, TestStatus.SKIPPED, skip_reason, 0., "")

            if args.testname:
                try:
                    self.send_test_name_failed(suite.suite, self.case)
                except:
                    return TestResult(self.name, TestStatus.FAIL, FailureReason.SERVER_DIED, 0.,
                        "\nServer does not respond to health check\n")

            self.runs_count += 1
            self.testcase_args = self.configure_testcase_args(args, self.case_file, suite.suite_tmp_path)
            client_options = self.add_random_settings(args, client_options)
            proc, stdout, stderr, total_time = self.run_single_test(server_logs_level, client_options)

            result = self.process_result_impl(proc, stdout, stderr, total_time)
            result.check_if_need_retry(args, stdout, stderr, self.runs_count)
            if result.status == TestStatus.FAIL:
                result.description = self.add_info_about_settings(args, result.description)
            return result
        except KeyboardInterrupt as e:
            raise e
        except HTTPError:
            return TestResult(self.name, TestStatus.FAIL,
                              FailureReason.INTERNAL_QUERY_FAIL,
                              0.,
                              self.add_info_about_settings(args, self.get_description_from_exception_info(sys.exc_info())))
        except (ConnectionRefusedError, ConnectionResetError):
            return TestResult(self.name, TestStatus.FAIL,
                              FailureReason.SERVER_DIED,
                              0.,
                              self.add_info_about_settings(args, self.get_description_from_exception_info(sys.exc_info())))
        except:
            return TestResult(self.name, TestStatus.UNKNOWN,
                              FailureReason.INTERNAL_ERROR,
                              0.,
                              self.get_description_from_exception_info(sys.exc_info()))
        finally:
            self.remove_random_settings_from_env()


class TestSuite:
    @staticmethod
    def tests_in_suite_key_func(item: str) -> int:
        if args.order == 'random':
            return random.random()

        reverse = 1 if args.order == 'asc' else -1

        if -1 == item.find('_'):
            return 99998

        prefix, _ = item.split('_', 1)

        try:
            return reverse * int(prefix)
        except ValueError:
            return 99997

    @staticmethod
    def render_test_template(j2env, suite_dir, test_name):
        """
        Render template for test and reference file if needed
        """

        if j2env is None:
            return test_name

        test_base_name = removesuffix(test_name, ".sql.j2", ".sql")

        reference_file_name = test_base_name + ".reference.j2"
        reference_file_path = os.path.join(suite_dir, reference_file_name)
        if os.path.isfile(reference_file_path):
            tpl = j2env.get_template(reference_file_name)
            tpl.stream().dump(os.path.join(suite_dir, test_base_name) + ".gen.reference")

        if test_name.endswith(".sql.j2"):
            tpl = j2env.get_template(test_name)
            generated_test_name = test_base_name + ".gen.sql"
            tpl.stream().dump(os.path.join(suite_dir, generated_test_name))
            return generated_test_name

        return test_name

    @staticmethod
    def read_test_tags(suite_dir: str, all_tests: List[str]) -> Dict[str, Set[str]]:
        def get_comment_sign(filename):
            if filename.endswith('.sql') or filename.endswith('.sql.j2'):
                return '--'
            elif filename.endswith('.sh') or filename.endswith('.py') or filename.endswith('.expect'):
                return '#'
            else:
                raise Exception(f'Unknown file_extension: {filename}')

        def parse_tags_from_line(line, comment_sign):
            if not line.startswith(comment_sign):
                return None
            tags_str = line[len(comment_sign):].lstrip()
            tags_prefix = "Tags:"
            if not tags_str.startswith(tags_prefix):
                return None
            tags_str = tags_str[len(tags_prefix):]
            tags = tags_str.split(',')
            tags = {tag.strip() for tag in tags}
            return tags

        def is_shebang(line):
            return line.startswith('#!')

        def load_tags_from_file(filepath):
            with open(filepath, 'r') as file:
                try:
                    line = file.readline()
                    if is_shebang(line):
                        line = file.readline()
                except UnicodeDecodeError:
                    return []
            return parse_tags_from_line(line, get_comment_sign(filepath))

        all_tags = {}
        start_time = datetime.now()
        for test_name in all_tests:
            tags = load_tags_from_file(os.path.join(suite_dir, test_name))
            if tags:
                all_tags[test_name] = tags
        elapsed = (datetime.now() - start_time).total_seconds()
        if elapsed > 1:
            print(f"Tags for suite {suite_dir} read in {elapsed:.2f} seconds")
        return all_tags

    def __init__(self, args, suite_path: str, suite_tmp_path: str, suite: str):
        self.args = args
        self.suite_path: str = suite_path
        self.suite_tmp_path: str = suite_tmp_path
        self.suite: str = suite

        filter_func = lambda x: True

        if args.run_by_hash_num is not None and args.run_by_hash_total is not None:
            if args.run_by_hash_num > args.run_by_hash_total:
                raise Exception(f"Incorrect run by hash, value {args.run_by_hash_num} bigger than total {args.run_by_hash_total}")

            filter_func = lambda x: stringhash(x) % args.run_by_hash_total == args.run_by_hash_num

        self.all_tests: List[str] = self.get_tests_list(self.tests_in_suite_key_func, filter_func)
        self.all_tags: Dict[str, Set[str]] = self.read_test_tags(self.suite_path, self.all_tests)

        self.sequential_tests = []
        self.parallel_tests = []
        for test_name in self.all_tests:
            if self.is_sequential_test(test_name):
                self.sequential_tests.append(test_name)
            else:
                self.parallel_tests.append(test_name)

    def is_sequential_test(self, test_name):
        if args.sequential:
            if any(s in test_name for s in args.sequential):
                return True

        if test_name not in self.all_tags:
            return False

        return ('no-parallel' in self.all_tags[test_name]) or ('sequential' in self.all_tags[test_name])

    def get_tests_list(self, sort_key, filter_func):
        """
        Return list of tests file names to run
        """

        all_tests = list(self.get_selected_tests(filter_func))
        all_tests = all_tests * self.args.test_runs
        all_tests.sort(key=sort_key)
        return all_tests

    def get_selected_tests(self, filter_func):
        """
        Find all files with tests, filter, render templates
        """

        j2env = jinja2.Environment(
            loader=jinja2.FileSystemLoader(self.suite_path),
            keep_trailing_newline=True,
        ) if USE_JINJA else None

        for test_name in os.listdir(self.suite_path):
            if not is_test_from_dir(self.suite_path, test_name):
                continue
            if self.args.test and not any(re.search(pattern, test_name) for pattern in self.args.test):
                continue
            if USE_JINJA and test_name.endswith(".gen.sql"):
                continue
            if not filter_func(test_name):
                continue
            test_name = self.render_test_template(j2env, self.suite_path, test_name)
            yield test_name

    @staticmethod
    def read_test_suite(args, suite_dir_name: str):
        def is_data_present():
            return int(clickhouse_execute(args, 'EXISTS TABLE test.hits'))

        base_dir = os.path.abspath(args.queries)
        tmp_dir = os.path.abspath(args.tmp)
        suite_path = os.path.join(base_dir, suite_dir_name)

        suite_re_obj = re.search('^[0-9]+_(.*)$', suite_dir_name)
        if not suite_re_obj:  # skip .gitignore and so on
            return None

        suite_tmp_path = os.path.join(tmp_dir, suite_dir_name)
        if not os.path.exists(suite_tmp_path):
            os.makedirs(suite_tmp_path)

        suite = suite_re_obj.group(1)

        if not os.path.isdir(suite_path):
            return None

        if 'stateful' in suite and not args.no_stateful and not is_data_present():
            print("Won't run stateful tests because test data wasn't loaded.")
            return None
        if 'stateless' in suite and args.no_stateless:
            print("Won't run stateless tests because they were manually disabled.")
            return None
        if 'stateful' in suite and args.no_stateful:
            print("Won't run stateful tests because they were manually disabled.")
            return None

        return TestSuite(args, suite_path, suite_tmp_path, suite)


stop_time = None
exit_code = None
server_died = None
stop_tests_triggered_lock = None
stop_tests_triggered = None
queue = None
multiprocessing_manager = None
restarted_tests = None

# def run_tests_array(all_tests: List[str], num_tests: int, test_suite: TestSuite):
def run_tests_array(all_tests_with_params):
    all_tests, num_tests, test_suite = all_tests_with_params
    global stop_time
    global exit_code
    global server_died
    global restarted_tests

    OP_SQUARE_BRACKET = colored("[", args, attrs=['bold'])
    CL_SQUARE_BRACKET = colored("]", args, attrs=['bold'])

    MSG_FAIL = OP_SQUARE_BRACKET + colored(" FAIL ", args, "red", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_UNKNOWN = OP_SQUARE_BRACKET + colored(" UNKNOWN ", args, "yellow", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_OK = OP_SQUARE_BRACKET + colored(" OK ", args, "green", attrs=['bold']) + CL_SQUARE_BRACKET
    MSG_SKIPPED = OP_SQUARE_BRACKET + colored(" SKIPPED ", args, "cyan", attrs=['bold']) + CL_SQUARE_BRACKET

    MESSAGES = {TestStatus.FAIL: MSG_FAIL, TestStatus.UNKNOWN: MSG_UNKNOWN, TestStatus.OK: MSG_OK, TestStatus.SKIPPED: MSG_SKIPPED}

    passed_total = 0
    skipped_total = 0
    failures_total = 0
    failures_chain = 0
    start_time = datetime.now()

    is_concurrent = multiprocessing.current_process().name != "MainProcess"

    client_options = get_additional_client_options(args)

    if num_tests > 0:
        about = 'about ' if is_concurrent else ''
        proc_name = multiprocessing.current_process().name
        print(f"\nRunning {about}{num_tests} {test_suite.suite} tests ({proc_name}).\n")

    while True:
        if is_concurrent:
            case = queue.get(timeout=args.timeout * 1.1)
            if not case:
                break
        else:
            if all_tests:
                case = all_tests.pop(0)
            else:
                break

        if server_died.is_set():
            stop_tests()
            break

        if stop_time and time() > stop_time:
            print("\nStop tests run because global time limit is exceeded.\n")
            stop_tests()
            break

        test_case = TestCase(test_suite, case, args, is_concurrent)

        try:
            description = ''
            if not is_concurrent:
                sys.stdout.flush()
                sys.stdout.write("{0:72}".format(removesuffix(test_case.name, ".gen", ".sql") + ": "))
                # This flush is needed so you can see the test name of the long
                # running test before it will finish. But don't do it in parallel
                # mode, so that the lines don't mix.
                sys.stdout.flush()
            else:
                description = "{0:72}".format(removesuffix(test_case.name, ".gen", ".sql") + ": ")

            while True:
                test_result = test_case.run(args, test_suite, client_options, server_logs_level)
                test_result = test_case.process_result(test_result, MESSAGES)
                if not test_result.need_retry:
                    break
                restarted_tests.append(test_result)

            if test_result.status == TestStatus.OK:
                passed_total += 1
                failures_chain = 0
            elif test_result.status == TestStatus.FAIL:
                failures_total += 1
                failures_chain += 1
                if test_result.reason == FailureReason.SERVER_DIED:
                    server_died.set()
                    stop_tests()

            elif test_result.status == TestStatus.SKIPPED:
                skipped_total += 1

            description += test_result.description

            if description and not description.endswith('\n'):
                description += '\n'

            sys.stdout.write(description)
            sys.stdout.flush()
        except KeyboardInterrupt as e:
            print(colored("Break tests execution", args, "red"))
            stop_tests()
            raise e

        if failures_chain >= 20:
            stop_tests()
            break

    if failures_total > 0:
        print(colored(f"\nHaving {failures_total} errors! {passed_total} tests passed."
            f" {skipped_total} tests skipped. {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
            f' ({multiprocessing.current_process().name}).',
            args, "red", attrs=["bold"]))
        exit_code.value = 1
    else:
        print(colored(f"\n{passed_total} tests passed. {skipped_total} tests skipped."
            f" {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
            f' ({multiprocessing.current_process().name}).',
            args, "green", attrs=["bold"]))

    sys.stdout.flush()


server_logs_level = "warning"


def check_server_started(args):
    print("Connecting to ClickHouse server...", end='')

    sys.stdout.flush()
    retry_count = args.server_check_retries
    while retry_count > 0:
        try:
            clickhouse_execute(args, 'SELECT 1')
            print(" OK")
            sys.stdout.flush()
            return True
        except (ConnectionRefusedError, ConnectionResetError):
            print('.', end='')
            sys.stdout.flush()
            retry_count -= 1
            sleep(0.5)
            continue

    print('\nAll connection tries failed')
    sys.stdout.flush()
    return False


class BuildFlags():
    THREAD = 'tsan'
    ADDRESS = 'asan'
    UNDEFINED = 'ubsan'
    MEMORY = 'msan'
    DEBUG = 'debug'
    RELEASE = 'release'
    ORDINARY_DATABASE = 'ordinary-database'
    POLYMORPHIC_PARTS = 'polymorphic-parts'


def collect_build_flags(args):
    result = []

    value = clickhouse_execute(args, "SELECT value FROM system.build_options WHERE name = 'CXX_FLAGS'")
    if b'-fsanitize=thread' in value:
        result.append(BuildFlags.THREAD)
    elif b'-fsanitize=address' in value:
        result.append(BuildFlags.ADDRESS)
    elif b'-fsanitize=undefined' in value:
        result.append(BuildFlags.UNDEFINED)
    elif b'-fsanitize=memory' in value:
        result.append(BuildFlags.MEMORY)

    value = clickhouse_execute(args, "SELECT value FROM system.build_options WHERE name = 'BUILD_TYPE'")
    if b'Debug' in value:
        result.append(BuildFlags.DEBUG)
    elif b'RelWithDebInfo' in value or b'Release' in value:
        result.append(BuildFlags.RELEASE)

    value = clickhouse_execute(args, "SELECT value FROM system.settings WHERE name = 'default_database_engine'")
    if value == b'Ordinary':
        result.append(BuildFlags.ORDINARY_DATABASE)

    value = int(clickhouse_execute(args, "SELECT value FROM system.merge_tree_settings WHERE name = 'min_bytes_for_wide_part'"))
    if value == 0:
        result.append(BuildFlags.POLYMORPHIC_PARTS)

    use_flags = clickhouse_execute(args, "SELECT name FROM system.build_options WHERE name like 'USE_%' AND value in ('ON', '1')")
    for use_flag in use_flags.strip().splitlines():
        use_flag = use_flag.decode().lower()
        result.append(use_flag)

    system_processor = clickhouse_execute(args, "SELECT value FROM system.build_options WHERE name = 'SYSTEM_PROCESSOR' LIMIT 1").strip()
    if system_processor:
        result.append(f'cpu-{system_processor.decode().lower()}')

    return result


def suite_key_func(item: str) -> Union[int, Tuple[int, str]]:
    if args.order == 'random':
        return random.random()

    if -1 == item.find('_'):
        return 99998, ''

    prefix, suffix = item.split('_', 1)

    try:
        return int(prefix), suffix
    except ValueError:
        return 99997, ''


def extract_key(key: str) -> str:
    return subprocess.getstatusoutput(
        args.extract_from_config +
        " --try --config " +
        args.configserver + key)[1]


def do_run_tests(jobs, test_suite: TestSuite, parallel):
    if jobs > 1 and len(test_suite.parallel_tests) > 0:
        print("Found", len(test_suite.parallel_tests), "parallel tests and", len(test_suite.sequential_tests), "sequential tests")
        run_n, run_total = parallel.split('/')
        run_n = float(run_n)
        run_total = float(run_total)
        tests_n = len(test_suite.parallel_tests)
        if run_total > tests_n:
            run_total = tests_n

        if jobs > tests_n:
            jobs = tests_n
        if jobs > run_total:
            run_total = jobs

        batch_size = max(1, len(test_suite.parallel_tests) // jobs)
        parallel_tests_array = []
        for _ in range(jobs):
            parallel_tests_array.append((None, batch_size, test_suite))

        with closing(multiprocessing.Pool(processes=jobs)) as pool:
            pool.map_async(run_tests_array, parallel_tests_array)

            for suit in test_suite.parallel_tests:
                queue.put(suit, timeout=args.timeout * 1.1)

            for _ in range(jobs):
                queue.put(None, timeout=args.timeout * 1.1)

            queue.close()

        pool.join()

        run_tests_array((test_suite.sequential_tests, len(test_suite.sequential_tests), test_suite))
        return len(test_suite.sequential_tests) + len(test_suite.parallel_tests)
    else:
        num_tests = len(test_suite.all_tests)
        run_tests_array((test_suite.all_tests, num_tests, test_suite))
        return num_tests


def is_test_from_dir(suite_dir, case):
    case_file = os.path.join(suite_dir, case)
    # We could also test for executable files (os.access(case_file, os.X_OK),
    # but it interferes with 01610_client_spawn_editor.editor, which is invoked
    # as a query editor in the test, and must be marked as executable.
    return os.path.isfile(case_file) and any(case_file.endswith(suppotred_ext) for suppotred_ext in TEST_FILE_EXTENSIONS)


def removesuffix(text, *suffixes):
    """
    Added in python 3.9
    https://www.python.org/dev/peps/pep-0616/

    This version can work with several possible suffixes
    """
    for suffix in suffixes:
        if suffix and text.endswith(suffix):
            return text[:-len(suffix)]
    return text


def main(args):
    global server_died
    global stop_time
    global exit_code
    global server_logs_level
    global restarted_tests

    if not check_server_started(args):
        msg = "Server is not responding. Cannot execute 'SELECT 1' query. \
            If you are using split build, you have to specify -c option."
        if args.hung_check:
            print(msg)
            pid = get_server_pid()
            print("Got server pid", pid)
            print_stacktraces()
        raise Exception(msg)

    args.build_flags = collect_build_flags(args)

    if args.skip:
        args.skip = set(args.skip)

    base_dir = os.path.abspath(args.queries)

    # Keep same default values as in queries/shell_config.sh
    os.environ.setdefault("CLICKHOUSE_BINARY", args.binary)
    # os.environ.setdefault("CLICKHOUSE_CLIENT", args.client)
    os.environ.setdefault("CLICKHOUSE_CONFIG", args.configserver)

    if args.configclient:
        os.environ.setdefault("CLICKHOUSE_CONFIG_CLIENT", args.configclient)

    # Force to print server warnings in stderr
    # Shell scripts could change logging level
    os.environ.setdefault("CLICKHOUSE_CLIENT_SERVER_LOGS_LEVEL", server_logs_level)

    # This code is bad as the time is not monotonic
    if args.global_time_limit:
        stop_time = time() + args.global_time_limit

    if args.zookeeper is None:
        try:
            args.zookeeper = int(extract_key(" --key zookeeper | grep . | wc -l")) > 0
        except ValueError:
            args.zookeeper = False

    if args.shard is None:
        args.shard = bool(extract_key(' --key listen_host | grep -E "127.0.0.2|::"'))

    def create_common_database(args, db_name):
        create_database_retries = 0
        while create_database_retries < MAX_RETRIES:
            start_time = datetime.now()
            try:
                clickhouse_execute(args, "CREATE DATABASE IF NOT EXISTS " + db_name + get_db_engine(args, db_name))
            except HTTPError as e:
                total_time = (datetime.now() - start_time).total_seconds()
                if not need_retry(args, e.message, e.message, total_time):
                    break
            create_database_retries += 1

    if args.database and args.database != "test":
        create_common_database(args, args.database)

    create_common_database(args, "test")

    total_tests_run = 0

    for suite in sorted(os.listdir(base_dir), key=suite_key_func):
        if server_died.is_set():
            break

        test_suite = TestSuite.read_test_suite(args, suite)
        if test_suite is None:
            continue

        total_tests_run += do_run_tests(args.jobs, test_suite, args.parallel)

    if server_died.is_set():
        exit_code.value = 1

    if args.hung_check:

        # Some queries may execute in background for some time after test was finished. This is normal.
        for _ in range(1, 60):
            processlist = get_processlist(args)
            if not processlist:
                break
            sleep(1)

        if processlist:
            print(colored("\nFound hung queries in processlist:", args, "red", attrs=["bold"]))
            print(json.dumps(processlist, indent=4))

            print_stacktraces()
            exit_code.value = 1
        else:
            print(colored("\nNo queries hung.", args, "green", attrs=["bold"]))

    if len(restarted_tests) > 0:
        print("\nSome tests were restarted:\n")

        for test_result in restarted_tests:
            print("\n{0:72}: ".format(test_result.case_name))
            # replace it with lowercase to avoid parsing retried tests as failed
            for status in TestStatus:
                test_result.description = test_result.description.replace(status.value, status.value.lower())
            print(test_result.description)

    if total_tests_run == 0:
        print("No tests were run.")
        sys.exit(1)
    else:
        print("All tests have finished.")

    sys.exit(exit_code.value)


def find_binary(name):
    if os.path.exists(name) and os.access(name, os.X_OK):
        return True
    paths = os.environ.get("PATH").split(':')
    for path in paths:
        if os.access(os.path.join(path, name), os.X_OK):
            return True

    # maybe it wasn't in PATH
    if os.access(os.path.join('/usr/local/bin', name), os.X_OK):
        return True
    if os.access(os.path.join('/usr/bin', name), os.X_OK):
        return True
    return False


def get_additional_client_options(args):
    if args.client_option:
        return ' '.join('--' + option for option in args.client_option)
    return ''

def get_additional_client_options_url(args):
    if args.client_option:
        return '&'.join(args.client_option)
    return ''

if __name__ == '__main__':
    stop_time = None
    exit_code = multiprocessing.Value("i", 0)
    server_died = multiprocessing.Event()
    stop_tests_triggered_lock = multiprocessing.Lock()
    stop_tests_triggered = multiprocessing.Event()
    queue = multiprocessing.Queue(maxsize=1)
    multiprocessing_manager = multiprocessing.Manager()
    restarted_tests = multiprocessing_manager.list()

    # Move to a new process group and kill it at exit so that we don't have any
    # infinite tests processes left
    # (new process group is required to avoid killing some parent processes)
    os.setpgid(0, 0)
    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGHUP, signal_handler)

    parser = ArgumentParser(description='ClickHouse functional tests')
    parser.add_argument('-q', '--queries', help='Path to queries dir')
    parser.add_argument('--tmp', help='Path to tmp dir')

    parser.add_argument('-b', '--binary', default='clickhouse',
        help='Path to clickhouse (if monolithic build, clickhouse-server otherwise) binary or name of binary in PATH')

    parser.add_argument('-c', '--client',
        help='Path to clickhouse-client (if split build, useless otherwise) binary of name of binary in PATH')

    parser.add_argument('--extract_from_config', help='extract-from-config program')
    parser.add_argument('--configclient', help='Client config (if you use not default ports)')
    parser.add_argument('--configserver', default='/etc/clickhouse-server/config.xml', help='Preprocessed server config')
    parser.add_argument('-o', '--output', help='Output xUnit compliant test report directory')
    parser.add_argument('-t', '--timeout', type=int, default=600, help='Timeout for each test case in seconds')
    parser.add_argument('--global_time_limit', type=int, help='Stop if executing more than specified time (after current test finished)')
    parser.add_argument('test', nargs='*', help='Optional test case name regex')
    parser.add_argument('-d', '--disabled', action='store_true', default=False, help='Also run disabled tests')
    parser.add_argument('--stop', action='store_true', default=None, dest='stop', help='Stop on network errors')
    parser.add_argument('--order', default='desc', choices=['asc', 'desc', 'random'], help='Run order')
    parser.add_argument('--testname', action='store_true', default=None, dest='testname', help='Make query with test name before test run')
    parser.add_argument('--hung-check', action='store_true', default=False)
    parser.add_argument('--no-left-queries-check', action='store_true', default=False)
    parser.add_argument('--force-color', action='store_true', default=False)
    parser.add_argument('--database', help='Database for tests (random name test_XXXXXX by default)')
    parser.add_argument('--no-drop-if-fail', action='store_true', help='Do not drop database for test if test has failed')
    parser.add_argument('--hide-db-name', action='store_true', help='Replace random database name with "default" in stderr')
    parser.add_argument('--parallel', default='1/1', help='One parallel test run number/total')
    parser.add_argument('-j', '--jobs', default=1, nargs='?', type=int, help='Run all tests in parallel')
    parser.add_argument('--test-runs', default=1, nargs='?', type=int, help='Run each test many times (useful for e.g. flaky check)')
    parser.add_argument('-U', '--unified', default=3, type=int, help='output NUM lines of unified context')
    parser.add_argument('-r', '--server-check-retries', default=180, type=int, help='Num of tries to execute SELECT 1 before tests started')
    parser.add_argument('--db-engine', help='Database engine name')
    parser.add_argument('--replicated-database', action='store_true', default=False, help='Run tests with Replicated database engine')
    parser.add_argument('--fast-tests-only', action='store_true', default=False, help='Run only fast tests (the tests without the "no-fasttest" tag)')
    parser.add_argument('--no-stateless', action='store_true', help='Disable all stateless tests')
    parser.add_argument('--no-stateful', action='store_true', help='Disable all stateful tests')
    parser.add_argument('--skip', nargs='+', help="Skip these tests")
    parser.add_argument('--sequential', nargs='+', help="Run these tests sequentially even if --parallel specified")
    parser.add_argument('--no-long', action='store_true', dest='no_long', help='Do not run long tests')
    parser.add_argument('--client-option', nargs='+', help='Specify additional client argument')
    parser.add_argument('--print-time', action='store_true', dest='print_time', help='Print test time')
    parser.add_argument('--check-zookeeper-session', action='store_true', help='Check ZooKeeper session uptime to determine if failed test should be retried')
    parser.add_argument('--s3-storage', action='store_true', default=False, help='Run tests over s3 storage')
    parser.add_argument('--no-random-settings', action='store_true', default=False, help='Disable settings randomization')

    parser.add_argument('--run-by-hash-num', type=int, help='Run tests matching crc32(test_name) % run_by_hash_total == run_by_hash_num')
    parser.add_argument('--run-by-hash-total', type=int, help='Total test groups for crc32(test_name) % run_by_hash_total == run_by_hash_num')

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument('--zookeeper', action='store_true', default=None, dest='zookeeper', help='Run zookeeper related tests')
    group.add_argument('--no-zookeeper', action='store_false', default=None, dest='zookeeper', help='Do not run zookeeper related tests')

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument('--shard', action='store_true', default=None, dest='shard', help='Run sharding related tests (required to clickhouse-server listen 127.0.0.2 127.0.0.3)')
    group.add_argument('--no-shard', action='store_false', default=None, dest='shard', help='Do not run shard related tests')

    group.add_argument('--backward-compatibility-check', action='store_true', help='Run tests for further backwoard compatibility testing by ignoring all'
                                                                                   'drop queries in tests for collecting data from new version of server')
    args = parser.parse_args()

    if args.queries and not os.path.isdir(args.queries):
        print(f"Cannot access the specified directory with queries ({args.queries})", file=sys.stderr)
        sys.exit(1)

    # Autodetect the directory with queries if not specified
    if args.queries is None:
        args.queries = 'queries'

    if not os.path.isdir(args.queries):
        # If we're running from the repo
        args.queries = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'queries')

    if not os.path.isdir(args.queries):
        # Next we're going to try some system directories, don't write 'stdout' files into them.
        if args.tmp is None:
            args.tmp = '/tmp/clickhouse-test'

        args.queries = '/usr/local/share/clickhouse-test/queries'

    if not os.path.isdir(args.queries):
        args.queries = '/usr/share/clickhouse-test/queries'

    if not os.path.isdir(args.queries):
        print("Failed to detect path to the queries directory. Please specify it with '--queries' option.", file=sys.stderr)
        sys.exit(1)

    print("Using queries from '" + args.queries + "' directory")

    if args.tmp is None:
        args.tmp = args.queries
    if args.client is None:
        if find_binary(args.binary + '-client'):
            args.client = args.binary + '-client'

            print("Using " + args.client + " as client program (expecting split build)")
        elif find_binary(args.binary):
            args.client = args.binary + ' client'

            print("Using " + args.client + " as client program (expecting monolithic build)")
        else:
            print("No 'clickhouse' or 'clickhouse-client' client binary found", file=sys.stderr)
            parser.print_help()
            sys.exit(1)

    if args.configclient:
        args.client += ' --config-file=' + args.configclient

    tcp_host = os.getenv("CLICKHOUSE_HOST")
    if tcp_host is not None:
        args.tcp_host = tcp_host
        args.client += f' --host={tcp_host}'
    else:
        args.tcp_host = 'localhost'

    tcp_port = os.getenv("CLICKHOUSE_PORT_TCP")
    if tcp_port is not None:
        args.tcp_port = int(tcp_port)
        args.client += f" --port={tcp_port}"
    else:
        args.tcp_port = 9000

    http_port = os.getenv("CLICKHOUSE_PORT_HTTP")
    if http_port is not None:
        args.http_port = int(http_port)
    else:
        args.http_port = 8123

    client_database = os.getenv("CLICKHOUSE_DATABASE")
    if client_database is not None:
        args.client += f' --database={client_database}'
        args.client_database = client_database
    else:
        args.client_database = 'default'

    if args.backward_compatibility_check:
        args.client += ' --fake-drop'

    if args.client_option:
        # Set options for client
        if 'CLICKHOUSE_CLIENT_OPT' in os.environ:
            os.environ['CLICKHOUSE_CLIENT_OPT'] += ' '
        else:
            os.environ['CLICKHOUSE_CLIENT_OPT'] = ''

        os.environ['CLICKHOUSE_CLIENT_OPT'] += get_additional_client_options(args)

        # Set options for curl
        if 'CLICKHOUSE_URL_PARAMS' in os.environ:
            os.environ['CLICKHOUSE_URL_PARAMS'] += '&'
        else:
            os.environ['CLICKHOUSE_URL_PARAMS'] = ''

        client_options_query_str = get_additional_client_options_url(args)
        args.client_options_query_str = client_options_query_str + '&'
        os.environ['CLICKHOUSE_URL_PARAMS'] += client_options_query_str
    else:
        args.client_options_query_str = ''

    if args.extract_from_config is None:
        if os.access(args.binary + '-extract-from-config', os.X_OK):
            args.extract_from_config = args.binary + '-extract-from-config'
        else:
            args.extract_from_config = args.binary + ' extract-from-config'

    if args.jobs is None:
        args.jobs = multiprocessing.cpu_count()

    main(args)