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201 lines (170 loc) · 6.45 KB
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import argparse
from typing import List, Tuple, Iterable, Optional
_GOOGLE_DEFAULT_PORT = 1080
_AWS_DEFAULT_PORT = 1091
_DEFAULT_AWS_GLOBAL_SERVICES: Tuple[str] = (
'iam',
'route53',
)
_DEFAULT_AWS_REGIONAL_SERVICES: Tuple[str] = (
"ce", # costexplorer
"cloudcontrolapi", # cloudcontrol
'cloudhsmv2', # cloudhsm
"ec2",
'logs', # cloudwatch
"s3",
"transfer",
)
_DEFAULT_AWS_REGIONS: Tuple[str] = (
"us-east-1",
"us-east-2",
"us-west-1",
"us-west-2",
"ap-south-1",
"ap-northeast-1",
"ap-northeast-2",
"ap-southeast-1",
"ap-southeast-2",
"ap-northeast-3",
"ca-central-1",
"eu-central-1",
"eu-west-1",
"eu-west-2",
"eu-west-3",
"eu-north-1",
"sa-east-1",
)
_DEFAULT_GCP_SERVICES: Tuple[str] = (
'compute',
'storage',
)
class _LB(object):
def __init__(self, lb_host: str, lb_port, backend_host: str, backend_port: int) -> None:
self._lb_host = lb_host
self._lb_port = lb_port
self._backend_host = backend_host
self._backend_port = backend_port
def get_lb_host(self) -> str:
return self._lb_host
def get_lb_port(self) -> int:
return self._lb_port
def get_backend_host(self) -> str:
return self._backend_host
def get_backend_port(self) -> int:
return self._backend_port
class _HostsGenerator(object):
def __init__(
self,
aws_global_services: Optional[Iterable[str]] = None,
aws_regional_services: Optional[Iterable[str]] = None,
aws_regions: Optional[Iterable[str]] = None,
google_services: Optional[Iterable[str]] = None
) -> None:
self._aws_global_services = aws_global_services if aws_global_services is not None else _DEFAULT_AWS_GLOBAL_SERVICES
self._aws_regional_services = aws_regional_services if aws_regional_services is not None else _DEFAULT_AWS_REGIONAL_SERVICES
self._aws_regions = aws_regions if aws_regions is not None else _DEFAULT_AWS_REGIONS
self._google_services = google_services if google_services is not None else _DEFAULT_GCP_SERVICES
@staticmethod
def _generate_aws_hosts(aws_regional_services: Iterable[str], aws_regions: Iterable[str], aws_global_services: Iterable[str]) -> Iterable[_LB]:
for service in aws_regional_services:
for region in aws_regions:
yield _LB(f'{service}.{region}.amazonaws.com', 443, '127.0.0.1', _AWS_DEFAULT_PORT)
for service in aws_global_services:
yield _LB(f'{service}.amazonaws.com', 443, '127.0.0.1', _AWS_DEFAULT_PORT)
@staticmethod
def _generate_gcp_hosts(google_services: Iterable[str]) -> Iterable[_LB]:
for service in google_services:
yield _LB(f'{service}.googleapis.com', 443, '127.0.0.1', _GOOGLE_DEFAULT_PORT)
def generate_all_load_balancers(self) -> Iterable[_LB]:
yield from self._generate_aws_hosts(self._aws_regional_services, self._aws_regions, self._aws_global_services)
yield from self._generate_gcp_hosts(self._google_services)
class _NginxConfigGenerator(object):
def __init__(self, n_indent: int = 2) -> None:
self._n_indent = n_indent
@staticmethod
def _generate_backends(hosts: Iterable[_LB], indent: int) -> Iterable[str]:
"""
Generate the nginx config.
"""
return [
" " * indent + f'{host.get_lb_host()} {host.get_backend_host()}:{host.get_backend_port()};'
for host in hosts
]
def _generate_file_content(self, hosts: Iterable[_LB]) -> Tuple[str]:
"""
Generate the file content.
"""
lines : Tuple[str] = (
'worker_processes 1;',
'',
'#error_log logs/error.log;',
'#error_log logs/error.log notice;',
'#error_log logs/error.log info;',
'',
'#pid logs/nginx.pid;',
'',
'',
'events {',
f'{" " * self._n_indent}worker_connections 1024;',
'}',
'',
'stream {',
'',
f'{" " * self._n_indent}map $ssl_preread_server_name $targetBackend {{',
*self._generate_backends(hosts, self._n_indent * 2),
f'{" " * self._n_indent}}}',
'',
f'{" " * self._n_indent}server {{',
f'{" " * self._n_indent}listen 443;',
f'{" " * self._n_indent}',
f'{" " * self._n_indent}proxy_connect_timeout 1s;',
f'{" " * self._n_indent}proxy_timeout 3s;',
f'{" " * self._n_indent}resolver 1.1.1.1;',
f'{" " * self._n_indent}',
f'{" " * self._n_indent}proxy_pass $targetBackend;',
f'{" " * self._n_indent}ssl_preread on;',
f'{" " * self._n_indent}}}',
'}',
)
return lines
def generate_file_content(self, hosts: Iterable[_LB]) -> Tuple[str]:
"""
Generate the file content.
"""
return self._generate_file_content(hosts)
class _HostsFileEntriesGenerator(object):
def __init__(self, hosts: Iterable[_LB]) -> None:
self._hosts = hosts
def generate_entries(self) -> Iterable[str]:
"""
Generate the entries.
"""
return tuple(
f'{host.get_backend_host()} {host.get_lb_host()}'
for host in self._hosts
)
def _parse_args() -> argparse.Namespace:
"""
Parse the arguments.
"""
parser = argparse.ArgumentParser(description='Create a token.')
parser.add_argument('--generate-nginx-lb', help='Opt-in nginx config generation', action=argparse.BooleanOptionalAction)
parser.add_argument('--generate-hosts-entries', help='Opt-in hosts files entries generation', action=argparse.BooleanOptionalAction)
# parser.add_argument('--header', type=str, help='The header.')
return parser.parse_args()
def generate_lb_config():
args = _parse_args()
host_gen = _HostsGenerator()
all_hosts = [lb for lb in host_gen.generate_all_load_balancers()]
nginx_cfg_gen = _NginxConfigGenerator()
if args.generate_nginx_lb:
for l in nginx_cfg_gen.generate_file_content(all_hosts):
print(l)
return
if args.generate_hosts_entries:
hosts_gen = _HostsFileEntriesGenerator(all_hosts)
for l in hosts_gen.generate_entries():
print(l)
return
if __name__ == '__main__':
generate_lb_config()