401 lines
22 KiB
Python
401 lines
22 KiB
Python
"""在 47 服务器创建空数据副本并进行受限验收，不停止线上服务或删除文件。"""
|
|
|
|
import argparse
|
|
from contextlib import closing
|
|
import hashlib
|
|
import json
|
|
import os
|
|
from pathlib import Path
|
|
import re
|
|
import secrets
|
|
import shutil
|
|
import sqlite3
|
|
import subprocess
|
|
import time
|
|
|
|
|
|
def run(*args):
|
|
return subprocess.check_output(args, text=True).strip()
|
|
|
|
|
|
def service_state():
|
|
return {name: run('systemctl', 'show', name, '--property=MainPID,NRestarts,ActiveState,InvocationID')
|
|
for name in ('smail.service', 'nginx.service', 'mysql.service', 'Scert.service',
|
|
'fdm-studio.service', 'postgresql@18-main.service')}
|
|
|
|
|
|
def database_integrity(root):
|
|
# 验收器不能创建数据库，也不能允许第二个状态库。
|
|
data = root / 'data'
|
|
assert not (data / 'smail-state.db').exists(), '单数据库实例生成了旧状态库'
|
|
assert sorted(path.name for path in data.glob('*.db')) == ['smail.db']
|
|
with closing(sqlite3.connect((data / 'smail.db').as_uri() + '?mode=ro', uri=True)) as database:
|
|
integrity = database.execute('PRAGMA integrity_check').fetchall()
|
|
assert database.execute("SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='config_records'").fetchone()[0] == 1
|
|
assert integrity == [('ok',)]
|
|
return {'smail.db': integrity}
|
|
|
|
|
|
def stop_test_units(names):
|
|
assert all(re.fullmatch(r'smail-runtime-(review|probe|nginx|netns)-[0-9]{8}-[0-9]{6}', name)
|
|
for name in names), '只能停止本轮隔离测试单元'
|
|
errors = []
|
|
for name in names:
|
|
try:
|
|
stopped = subprocess.run(['systemctl', 'stop', name], capture_output=True,
|
|
text=True, timeout=25)
|
|
if stopped.returncode and 'not loaded' not in stopped.stderr:
|
|
raise subprocess.CalledProcessError(stopped.returncode, 'systemctl')
|
|
except (OSError, subprocess.SubprocessError) as error:
|
|
errors.append({'unit': name, 'action': 'stop', 'error': type(error).__name__})
|
|
try:
|
|
subprocess.run(['systemctl', 'kill', '--kill-whom=all', '--signal=SIGKILL', name],
|
|
check=True, capture_output=True, timeout=15)
|
|
except (OSError, subprocess.SubprocessError) as kill_error:
|
|
errors.append({'unit': name, 'action': 'kill', 'error': type(kill_error).__name__})
|
|
return errors
|
|
|
|
|
|
def collect_and_stop(result, unit, probe_unit, proxy_unit=None):
|
|
result['resource_errors'] = []
|
|
try:
|
|
for key, name in [('resources', unit)] + ([('nginx_resources', proxy_unit)] if proxy_unit else []):
|
|
try:
|
|
result[key] = subprocess.check_output([
|
|
'systemctl', 'show', name,
|
|
'--property=MemoryPeak,MemoryCurrent,MemorySwapPeak,Result,ExecMainStatus,NRestarts',
|
|
], text=True, timeout=15).strip()
|
|
except (OSError, subprocess.SubprocessError) as error:
|
|
result['resource_errors'].append({'unit': name, 'error': type(error).__name__})
|
|
finally:
|
|
names = ([proxy_unit] if proxy_unit else []) + [probe_unit, unit]
|
|
result['cleanup_errors'] = stop_test_units(names)
|
|
|
|
|
|
def migration_kind(source, target, enabled, interrupted):
|
|
if target is None:
|
|
return source
|
|
if not enabled or interrupted or target not in ('sqlite', 'mysql', 'postgres'):
|
|
raise ValueError('跨引擎目标必须用于独立 SQL 迁移验收')
|
|
return target
|
|
|
|
|
|
def stop_database_bridges(bridges, result):
|
|
errors = result.setdefault('cleanup_errors', [])
|
|
closed = []
|
|
for port, bridge in reversed(list(bridges.items())):
|
|
try:
|
|
bridge.close()
|
|
closed.append(port)
|
|
except Exception as error:
|
|
errors.append({'action': 'database_bridge', 'port': port, 'error': type(error).__name__})
|
|
result['database_bridge_ports_stopped'] = sorted(closed)
|
|
result['database_bridge_stopped'] = bool(bridges) and len(closed) == len(bridges)
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument('--main-sha', required=True)
|
|
parser.add_argument('--binary', type=Path, default=Path('/opt/smail/smail'))
|
|
parser.add_argument('--nginx-template', type=Path)
|
|
parser.add_argument('--memory-max-mib', type=int, choices=(128, 192, 256), default=128)
|
|
parser.add_argument('--restore', action='store_true')
|
|
parser.add_argument('--migration', action='store_true')
|
|
parser.add_argument('--interruption', action='store_true')
|
|
parser.add_argument('--database-type', choices=('sqlite', 'mysql', 'postgres'), default='sqlite')
|
|
parser.add_argument('--migration-target-type', choices=('sqlite', 'mysql', 'postgres'))
|
|
args = parser.parse_args()
|
|
try:
|
|
target_kind = migration_kind(args.database_type, args.migration_target_type, args.migration, args.interruption)
|
|
except ValueError as error:
|
|
parser.error(str(error))
|
|
if args.interruption and (not args.migration or args.database_type != 'sqlite'):
|
|
parser.error('中断验收必须选择 SQLite 迁移独立场景')
|
|
if args.migration and (args.nginx_template or args.restore):
|
|
parser.error('迁移进程验收仅使用直接 TLS 的独立场景')
|
|
if args.restore and args.database_type != 'sqlite':
|
|
parser.error('SQL 数据库备份恢复需要独立验收，不能套用 SQLite 冷备流程')
|
|
assert os.geteuid() == 0 and run('hostname') == 'ikun2'
|
|
os.umask(0o027)
|
|
live = Path('/opt/smail')
|
|
binary = args.binary.resolve(strict=True)
|
|
assert binary == args.binary and binary.is_file()
|
|
if binary != live / 'smail':
|
|
assert binary.parent.parent == Path('/var/tmp') and binary.parent.name.startswith('smail-review-')
|
|
assert binary.stat().st_uid == 0 and binary.stat().st_mode & 0o022 == 0
|
|
assert binary.parent.stat().st_uid == 0 and binary.parent.stat().st_mode & 0o022 == 0
|
|
with binary.open('rb') as stream:
|
|
assert hashlib.file_digest(stream, 'sha256').hexdigest() == args.main_sha
|
|
stream.seek(0)
|
|
header = stream.read(20)
|
|
assert header[:5] == b'\x7fELF\x02' and header[18:20] == b'\x3e\x00'
|
|
with (live / 'smail').open('rb') as stream:
|
|
live_sha = hashlib.file_digest(stream, 'sha256').hexdigest()
|
|
memory = dict(line.split(':', 1) for line in Path('/proc/meminfo').read_text().splitlines())
|
|
required_memory = args.memory_max_mib + (192 if args.nginx_template else 144)
|
|
assert int(memory['MemAvailable'].split()[0]) >= required_memory * 1024, '可用内存不足，暂停隔离验收'
|
|
stamp = time.strftime('%Y%m%d-%H%M%S')
|
|
target = Path('/var/tmp') / ('smail-review-runtime-' + stamp)
|
|
target.mkdir(mode=0o750)
|
|
shutil.chown(target, user='smail', group='smail')
|
|
root = target / 'instance'
|
|
control = target / 'control'
|
|
for directory in (root, control, root / 'ssl'):
|
|
directory.mkdir(mode=0o750)
|
|
shutil.chown(directory, user='smail', group='smail')
|
|
shutil.copy2(binary, root / 'smail')
|
|
(root / 'smail').chmod(0o755)
|
|
shutil.copy2(Path(__file__).with_name('runtime_probe.py'), target / 'runtime_probe.py')
|
|
(target / 'runtime_probe.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_probe.py', user='root', group='smail')
|
|
if args.migration:
|
|
shutil.copy2(Path(__file__).with_name('runtime_migration.py'), target / 'runtime_migration.py')
|
|
(target / 'runtime_migration.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_migration.py', user='root', group='smail')
|
|
mixed = args.migration and args.database_type != target_kind and 'sqlite' in (args.database_type, target_kind)
|
|
if args.database_type != 'sqlite' or mixed:
|
|
shutil.copy2(Path(__file__).with_name('runtime_sql.py'), target / 'runtime_sql.py')
|
|
(target / 'runtime_sql.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_sql.py', user='root', group='smail')
|
|
if args.migration:
|
|
shutil.copy2(Path(__file__).with_name('runtime_sql_migration.py'), target / 'runtime_sql_migration.py')
|
|
(target / 'runtime_sql_migration.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_sql_migration.py', user='root', group='smail')
|
|
if mixed:
|
|
shutil.copy2(Path(__file__).with_name('runtime_mixed_migration.py'), target / 'runtime_mixed_migration.py')
|
|
(target / 'runtime_mixed_migration.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_mixed_migration.py', user='root', group='smail')
|
|
if args.interruption:
|
|
shutil.copy2(Path(__file__).with_name('runtime_interruption.py'), target / 'runtime_interruption.py')
|
|
(target / 'runtime_interruption.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_interruption.py', user='root', group='smail')
|
|
if args.nginx_template:
|
|
shutil.copy2(Path(__file__).with_name('runtime_proxy.py'), target / 'runtime_proxy.py')
|
|
(target / 'runtime_proxy.py').chmod(0o640)
|
|
shutil.chown(target / 'runtime_proxy.py', user='root', group='smail')
|
|
subprocess.run(['openssl', 'req', '-x509', '-newkey', 'rsa:2048', '-nodes', '-days', '2',
|
|
'-keyout', str(root / 'ssl/runtime.key'), '-out', str(root / 'ssl/runtime.crt'),
|
|
'-subj', '/CN=mail.runtime.invalid', '-addext',
|
|
'subjectAltName=DNS:runtime.invalid,DNS:*.runtime.invalid'],
|
|
check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
|
|
for name in ('runtime.key', 'runtime.crt'):
|
|
path = root / 'ssl' / name
|
|
path.chmod(0o600)
|
|
shutil.chown(path, user='smail', group='smail')
|
|
assert not (root / 'data').exists() and not (root / 'config.json').exists()
|
|
before = service_state()
|
|
unit = 'smail-runtime-review-' + stamp
|
|
probe_unit = 'smail-runtime-probe-' + stamp
|
|
proxy_unit = 'smail-runtime-nginx-' + stamp
|
|
result = {'target': str(target), 'unit': unit, 'main_sha256': args.main_sha,
|
|
'memory_max_mib': args.memory_max_mib,
|
|
'source': str(binary), 'live_sha256': live_sha, 'before': before,
|
|
'topology': 'nginx-8001-8002' if args.nginx_template else 'direct-80-443'}
|
|
service_env = []
|
|
probe_args = []
|
|
sql_fixture = None
|
|
migration_target = None
|
|
network_unit = None
|
|
bridges = {}
|
|
result['database_type'] = args.database_type
|
|
if args.database_type != 'sqlite':
|
|
from runtime_sql import SQLFixture
|
|
sql_fixture = SQLFixture(args.database_type)
|
|
result['sql_database'] = sql_fixture.settings['name']
|
|
if args.migration and target_kind != 'sqlite':
|
|
from runtime_sql_migration import MigrationTarget
|
|
migration_target = MigrationTarget(target_kind)
|
|
result['sql_target_database'] = migration_target.settings['name']
|
|
if args.migration:
|
|
result['migration_target_type'] = target_kind
|
|
mixed_source = mixed_target = None
|
|
if mixed:
|
|
from runtime_mixed_migration import SQLiteDatabase
|
|
mixed_source = sql_fixture or SQLiteDatabase(root, {'kind': 'sqlite', 'name': 'smail.db'})
|
|
mixed_target = migration_target or SQLiteDatabase(root, {'kind': 'sqlite', 'name': 'migrated.db'})
|
|
if args.nginx_template:
|
|
from runtime_proxy import prepare_nginx
|
|
prepare_nginx(target, root, args.nginx_template)
|
|
result['nginx_template_sha256'] = hashlib.sha256(args.nginx_template.read_bytes()).hexdigest()
|
|
service_env = ['--setenv=setup_port=8001', '--setenv=SMAIL_HTTP_PORT=8001',
|
|
'--setenv=SMAIL_HTTPS_PORT=8002']
|
|
probe_args = ['--proxy']
|
|
started = time.strftime('%Y-%m-%dT%H:%M:%S')
|
|
password = secrets.token_urlsafe(9)
|
|
try:
|
|
if sql_fixture:
|
|
sql_fixture.create()
|
|
probe_args.append('--sql-stdin')
|
|
network_args = ['--property=PrivateNetwork=yes']
|
|
if migration_target:
|
|
migration_target.create()
|
|
if args.migration and (sql_fixture or migration_target):
|
|
# 使用独立限时单元固定隔离网络，应用换进程后仍能访问本轮数据库桥接。
|
|
network_unit = 'smail-runtime-netns-' + stamp
|
|
subprocess.run([
|
|
'systemd-run', '--unit=' + network_unit, '--property=Type=exec',
|
|
'--property=User=smail', '--property=Group=smail', '--property=PrivateNetwork=yes',
|
|
'--property=ProtectSystem=strict', '--property=ProtectHome=yes',
|
|
'--property=NoNewPrivileges=yes', '--property=InaccessiblePaths=/opt/smail /run/smail',
|
|
'--property=MemoryMax=8M', '--property=MemorySwapMax=0', '--property=TasksMax=8',
|
|
'--property=RuntimeMaxSec=900s', '/usr/bin/sleep', '900',
|
|
], check=True)
|
|
network_pid = run('systemctl', 'show', network_unit, '--property=MainPID', '--value')
|
|
assert network_pid.isdigit() and int(network_pid) > 0
|
|
assert Path('/proc/' + network_pid + '/ns/net').readlink() != Path('/proc/self/ns/net').readlink()
|
|
network_args = ['--property=NetworkNamespacePath=/proc/' + network_pid + '/ns/net']
|
|
subprocess.run([
|
|
'systemd-run', '--unit=' + unit, '--property=Type=exec',
|
|
'--property=User=smail', '--property=Group=smail',
|
|
*network_args, '--property=PrivateTmp=yes',
|
|
'--property=ProtectSystem=strict', '--property=ProtectHome=yes',
|
|
'--property=NoNewPrivileges=yes', '--property=CapabilityBoundingSet=CAP_NET_BIND_SERVICE',
|
|
'--property=AmbientCapabilities=CAP_NET_BIND_SERVICE',
|
|
'--property=MemoryMax=' + str(args.memory_max_mib) + 'M',
|
|
'--property=MemorySwapMax=0', '--property=CPUQuota=25%',
|
|
'--property=TasksMax=128', '--property=RuntimeMaxSec=' + ('600s' if args.migration else '300s'),
|
|
'--property=OOMPolicy=stop',
|
|
'--property=KillMode=control-group', '--property=TimeoutStopSec=10s',
|
|
'--property=BindPaths=' + str(root) + ':/opt/smail ' + str(control) + ':/run/smail',
|
|
'--property=ReadWritePaths=/opt/smail /run/smail',
|
|
'--property=WorkingDirectory=/opt/smail', '--setenv=SMAIL_ROOT=/opt/smail',
|
|
'--setenv=GOMEMLIMIT=64MiB', '--setenv=GOMAXPROCS=1', *service_env, '/opt/smail/smail',
|
|
], check=True)
|
|
pid = run('systemctl', 'show', unit, '--property=MainPID', '--value')
|
|
assert pid != '0'
|
|
live_net = str(Path('/proc/self/ns/net').readlink())
|
|
assert str(Path('/proc/' + pid + '/ns/net').readlink()) != live_net
|
|
assert Path('/proc/' + pid + '/root/opt/smail/smail').stat().st_ino == (root / 'smail').stat().st_ino
|
|
assert (root / 'smail').stat().st_ino != (live / 'smail').stat().st_ino
|
|
if sql_fixture or migration_target:
|
|
from runtime_sql_bridge import DatabaseBridge
|
|
ports = {fixture.port for fixture in (sql_fixture, migration_target) if fixture}
|
|
for port in sorted(ports):
|
|
bridges[port] = DatabaseBridge(int(pid), port)
|
|
result['database_bridge_ports'] = sorted(bridges)
|
|
if args.nginx_template:
|
|
subprocess.run([
|
|
'systemd-run', '--unit=' + proxy_unit, '--property=Type=exec',
|
|
'--property=User=smail', '--property=Group=smail',
|
|
'--property=NetworkNamespacePath=/proc/' + pid + '/ns/net',
|
|
'--property=PrivateTmp=no', '--property=ProtectSystem=strict',
|
|
'--property=ProtectHome=yes', '--property=NoNewPrivileges=yes',
|
|
'--property=InaccessiblePaths=/opt/smail /run/smail /etc/nginx',
|
|
'--property=ReadWritePaths=' + str(target / 'nginx'),
|
|
'--property=CapabilityBoundingSet=CAP_NET_BIND_SERVICE',
|
|
'--property=AmbientCapabilities=CAP_NET_BIND_SERVICE',
|
|
'--property=MemoryMax=32M', '--property=MemorySwapMax=0',
|
|
'--property=CPUQuota=25%', '--property=TasksMax=16',
|
|
'--property=RuntimeMaxSec=300s', '--property=OOMPolicy=stop',
|
|
'--property=KillMode=control-group', '--property=TimeoutStopSec=10s',
|
|
'/usr/sbin/nginx', '-p', str(target / 'nginx'),
|
|
'-c', str(target / 'nginx/nginx.conf'), '-g', 'daemon off;',
|
|
], check=True)
|
|
probe = subprocess.run([
|
|
'systemd-run', '--wait', '--pipe', '--unit=' + probe_unit,
|
|
'--property=User=smail', '--property=Group=smail',
|
|
'--property=NetworkNamespacePath=/proc/' + pid + '/ns/net',
|
|
'--property=PrivateTmp=no', '--property=ProtectSystem=strict', '--property=ProtectHome=yes',
|
|
'--property=NoNewPrivileges=yes', '--property=InaccessiblePaths=/opt/smail /run/smail',
|
|
'--property=ReadWritePaths=' + str(target), '--property=MemoryMax=48M',
|
|
'--property=MemorySwapMax=0', '--property=CPUQuota=25%', '--property=TasksMax=32',
|
|
'--property=RuntimeMaxSec=240s', '--property=OOMPolicy=stop',
|
|
'--property=KillMode=control-group', '--property=TimeoutStopSec=10s',
|
|
'python3', str(target / 'runtime_probe.py'), str(root), '--live-net', live_net,
|
|
'--password-stdin', *probe_args,
|
|
], input=password + '\n' + (json.dumps(sql_fixture.settings) + '\n' if sql_fixture else ''),
|
|
text=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=270)
|
|
(target / 'probe.log').write_text(probe.stdout, encoding='utf-8')
|
|
result['probe_code'] = probe.returncode
|
|
if (target / 'probe-result.json').exists():
|
|
result['probe'] = json.loads((target / 'probe-result.json').read_text())
|
|
assert probe.returncode == 0, '隔离验收失败，请检查保留的 probe.log'
|
|
assert result['probe']['passed']
|
|
with sqlite3.connect(f'file:{live / "data/smail.db"}?mode=ro', uri=True) as database:
|
|
message_id = result['probe']['smtp']['message_id']
|
|
assert database.execute('SELECT COUNT(*) FROM email WHERE msg_id=?', (message_id,)).fetchone()[0] == 0
|
|
result['live_message_absent'] = True
|
|
if args.migration:
|
|
if args.interruption:
|
|
from runtime_interruption import verify_interruption
|
|
verify_interruption(root, unit, password, result)
|
|
if mixed:
|
|
from runtime_mixed_migration import verify_migration
|
|
verify_migration(root, unit, password, result, mixed_source, mixed_target)
|
|
elif migration_target:
|
|
from runtime_sql_migration import verify_migration
|
|
verify_migration(root, unit, password, result, sql_fixture, migration_target)
|
|
else:
|
|
from runtime_migration import verify_migration
|
|
verify_migration(root, unit, password, result)
|
|
finally:
|
|
try:
|
|
collect_and_stop(result, unit, probe_unit, proxy_unit if args.nginx_template else None)
|
|
result['after'] = service_state()
|
|
with (live / 'smail').open('rb') as stream:
|
|
result['live_unchanged'] = (result['after'] == before
|
|
and hashlib.file_digest(stream, 'sha256').hexdigest() == live_sha)
|
|
try:
|
|
if mixed:
|
|
from runtime_mixed_migration import migration_integrity
|
|
result['integrity'] = migration_integrity(root, mixed_source, mixed_target)
|
|
elif migration_target:
|
|
from runtime_sql_migration import assert_active
|
|
assert_active(root, migration_target)
|
|
result['integrity'] = migration_target.integrity(root)
|
|
elif args.migration:
|
|
from runtime_migration import migration_integrity
|
|
result['integrity'] = migration_integrity(root, interrupted=args.interruption)
|
|
else:
|
|
result['integrity'] = sql_fixture.integrity(root) if sql_fixture else database_integrity(root)
|
|
except (AssertionError, sqlite3.Error, RuntimeError, OSError, ValueError, subprocess.SubprocessError) as error:
|
|
result['integrity'] = {'error': type(error).__name__}
|
|
finally:
|
|
result.setdefault('cleanup_errors', [])
|
|
if bridges:
|
|
stop_database_bridges(bridges, result)
|
|
if sql_fixture:
|
|
try:
|
|
sql_fixture.lock()
|
|
result['test_database_account_locked'] = True
|
|
except Exception as error:
|
|
result['cleanup_errors'].append({'action': 'database_account', 'error': type(error).__name__})
|
|
if migration_target:
|
|
try:
|
|
migration_target.lock()
|
|
result['migration_target_account_locked'] = True
|
|
except Exception as error:
|
|
result['cleanup_errors'].append({'action': 'migration_target_account', 'error': type(error).__name__})
|
|
if network_unit:
|
|
errors = stop_test_units([network_unit])
|
|
result['cleanup_errors'].extend(errors)
|
|
result['network_anchor_stopped'] = not errors
|
|
(target / 'service.log').write_text(run('journalctl', '-u', unit, '--no-pager'), encoding='utf-8')
|
|
kernel = run('journalctl', '-k', '--since', started, '--no-pager')
|
|
result['oom_events'] = sum('oom-kill:constraint=' in line for line in kernel.splitlines())
|
|
(target / 'result.json').write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding='utf-8')
|
|
print(json.dumps(result, ensure_ascii=False, indent=2))
|
|
assert result['live_unchanged'] and result['oom_events'] == 0
|
|
assert not result['cleanup_errors'], '测试单元未全部停止，需要核查保留的结果'
|
|
assert not result['resource_errors'], '资源证据不完整，需要核查保留的结果'
|
|
if mixed:
|
|
assert result['migration']['passed'] and result['network_anchor_stopped']
|
|
assert result['integrity']['config_records'] > 0
|
|
elif sql_fixture:
|
|
assert result['integrity'].get('sqlite_files') == 0 and result['integrity']['config_records'] > 0
|
|
if args.migration:
|
|
assert result['migration']['passed'] and result['network_anchor_stopped']
|
|
elif args.migration:
|
|
assert result['migration']['passed'] and result['integrity']['active_database'] == 'migrated.db'
|
|
else:
|
|
assert result['integrity'] == {'smail.db': [('ok',)]}
|
|
if args.restore:
|
|
from runtime_restore import verify_backup_restore
|
|
restored = verify_backup_restore(root, result, password, args.nginx_template is not None)
|
|
(target / 'restore-result.json').write_text(json.dumps(restored, ensure_ascii=False, indent=2), encoding='utf-8')
|
|
print(json.dumps({'restore': restored}, ensure_ascii=False, indent=2))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|