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Varios configuration parameters for etcd (#358)

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* Add https and auth support for etcd

Also implement support of PATRONI_ETCD_URL and PATRONI_ETCD_SRV
environment variables

* Implement etcd.proxy etcd.cacert, etcd.cert and etcd.key support

Now it should be possible to set up fully encrypted connection to etcd
with authorization.
This commit is contained in:
Alexander Kukushkin
2016-12-06 16:40:21 +01:00
committed by GitHub
parent c6417b2558
commit b299b12f58
6 changed files with 104 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/ENVIRONMENT.rst
+6
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@@ -27,6 +27,12 @@ Consul
Etcd
----
- **PATRONI\_ETCD\_HOST**: the host:port for the etcd endpoint.
- **PATRONI\_ETCD\_URL**: url for the etcd, in format: http(s)://(username:password@)host:port
- **PATRONI\_ETCD\_PROXY**: proxy url for the etcd. If you are connecting to the etcd using proxy, use this parameter instead of **PATRONI\_ETCD\_URL**
- **PATRONI\_ETCD\_SRV**: Domain to search the SRV record(s) for cluster autodiscovery.
- **PATRONI\_ETCD\_CACERT**: The ca certificate. If pressent it will enable validation.
- **PATRONI\_ETCD\_CERT**: File with the client certificate
- **PATRONI\_ETCD\_KEY**: File with the client key. Can be empty if the key is part of certificate.
Exhibitor
---------
docs/SETTINGS.rst
+10
View File
@@ -41,7 +41,17 @@ Consul
Etcd
----
Most of the parameters are optional, but you have to specify one of the **host**, **url**, **proxy** or **srv**
- **host**: the host:port for the etcd endpoint.
- **url**: url for the etcd
- **proxy**: proxy url for the etcd. If you are connecting to the etcd using proxy, use this parameter instead of **url**
- **srv**: Domain to search the SRV record(s) for cluster autodiscovery.
- **protocol**: (optional) http or https, if not specified http is used. If the **url** or **proxy** is specified - will take protocol from them.
- **username**: (optional) username for etcd authentication
- **password**: (optional) password for etcd authentication.
- **cacert**: (optional) The ca certificate. If pressent it will enable validation.
- **cert**: (optional) file with the client certificate
- **key**: (optional) file with the client key. Can be empty if the key is part of **cert**.
Exhibitor
---------
patroni/config.py
+3 -2
View File
@@ -236,8 +236,9 @@ class Config(object):
if param.startswith(Config.PATRONI_ENV_PREFIX):
name, suffix = (param[8:].rsplit('_', 1) + [''])[:2]
if name and suffix:
# PATRONI_(ETCD|CONSUL|ZOOKEEPER|EXHIBITOR|...)_(HOSTS?|PORT)
if suffix in ('HOST', 'HOSTS', 'PORT') and '_' not in name:
# PATRONI_(ETCD|CONSUL|ZOOKEEPER|EXHIBITOR|...)_(HOSTS?|PORT|..)
if suffix in ('HOST', 'HOSTS', 'PORT', 'SRV', 'URL', 'PROXY', 'CACERT', 'CERT', 'KEY') \
and '_' not in name:
value = os.environ.pop(param)
if suffix == 'PORT':
value = value and parse_int(value)
patroni/dcs/etcd.py
+53 -16
View File
@@ -15,6 +15,7 @@ from patroni.utils import Retry, RetryFailedError
from urllib3.exceptions import HTTPError, ReadTimeoutError
from requests.exceptions import RequestException
from six.moves.http_client import HTTPException
from six.moves.urllib_parse import urlparse
logger = logging.getLogger(__name__)
@@ -26,10 +27,12 @@ class EtcdError(DCSError):
class Client(etcd.Client):
def __init__(self, config):
super(Client, self).__init__(read_timeout=config['retry_timeout'])
args = {p: config.get(p) for p in ('host', 'port', 'protocol', 'use_proxies', 'username', 'password',
'cert', 'ca_cert') if config.get(p)}
super(Client, self).__init__(read_timeout=config['retry_timeout'], **args)
self._config = config
self._load_machines_cache()
self._allow_reconnect = True
self._allow_reconnect = not self._use_proxies
def _build_request_parameters(self):
kwargs = {'headers': self._get_headers(), 'redirect': self.allow_redirect}
@@ -147,40 +150,48 @@ class Client(etcd.Client):
@staticmethod
def get_srv_record(host):
try:
return [(str(r.target).rstrip('.'), r.port) for r in resolver.query('_etcd-server._tcp.' + host, 'SRV')]
return [(r.target.to_text(True), r.port) for r in resolver.query(host, 'SRV')]
except DNSException:
logger.exception('Can not resolve SRV for %s', host)
return []
def _get_machines_cache_from_srv(self, discovery_srv):
def _get_machines_cache_from_srv(self, srv):
"""Fetch list of etcd-cluster member by resolving _etcd-server._tcp. SRV record.
This record should contain list of host and peer ports which could be used to run
'GET http://{host}:{port}/members' request (peer protocol)"""
ret = []
for host, port in self.get_srv_record(discovery_srv):
url = '{0}://{1}:{2}/members'.format(self._protocol, host, port)
for r in ['-client-ssl', '-client', '-ssl', '', '-server-ssl', '-server']:
protocol = 'https' if '-ssl' in r else 'http'
endpoint = '/members' if '-server' in r else ''
for host, port in self.get_srv_record('_etcd{0}._tcp.{1}'.format(r, srv)):
url = '{0}://{1}:{2}{3}'.format(protocol, host, port, endpoint)
if endpoint:
try:
response = requests.get(url, timeout=self.read_timeout)
response = requests.get(url, timeout=self.read_timeout, verify=False)
if response.ok:
for member in response.json():
ret.extend(member['clientURLs'])
break
except RequestException:
logger.exception('GET %s', url)
else:
ret.append(url)
if ret:
self._protocol = protocol
break
return list(set(ret))
def _get_machines_cache_from_dns(self, addr):
def _get_machines_cache_from_dns(self, host, port):
"""One host might be resolved into multiple ip addresses. We will make list out of it"""
ret = []
host, port = addr.split(':')
try:
for r in set(socket.getaddrinfo(host, port, socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)):
ret.append('{0}://{1}:{2}'.format(self._protocol, r[4][0], r[4][1]))
ret.append('{0}://{1}:{2}'.format(self.protocol, *r[4]))
except socket.error:
logger.exception('Can not resolve %s', host)
return list(set(ret)) if ret else ['{0}://{1}:{2}'.format(self._protocol, host, port)]
return list(set(ret)) if ret else ['{0}://{1}:{2}'.format(self.protocol, host, port)]
def _load_machines_cache(self):
"""This method should fill up `_machines_cache` from scratch.
@@ -190,16 +201,19 @@ class Client(etcd.Client):
self._update_machines_cache = True
if 'discovery_srv' not in self._config and 'host' not in self._config:
raise Exception('Neither discovery_srv nor host are defined in etcd section of config')
if 'srv' not in self._config and 'host' not in self._config:
raise Exception('Neither srv nor host url are defined in etcd section of config')
if self._use_proxies:
self._machines_cache = ['{0}://{1}:{2}'.format(self.protocol, self._config['host'], self._config['port'])]
else:
self._machines_cache = []
if 'discovery_srv' in self._config:
self._machines_cache = self._get_machines_cache_from_srv(self._config['discovery_srv'])
if 'srv' in self._config:
self._machines_cache = self._get_machines_cache_from_srv(self._config['srv'])
if not self._machines_cache and 'host' in self._config:
self._machines_cache = self._get_machines_cache_from_dns(self._config['host'])
self._machines_cache = self._get_machines_cache_from_dns(self._config['host'], self._config['port'])
# Can not bootstrap list of etcd-cluster members, giving up
if not self._machines_cache:
@@ -245,6 +259,29 @@ class Etcd(AbstractDCS):
@staticmethod
def get_etcd_client(config):
if 'proxy' in config:
config['use_proxies'] = True
config['url'] = config['proxy']
if 'url' in config:
r = urlparse(config['url'])
config.update({'protocol': r.scheme, 'host': r.hostname, 'port': r.port or 2379,
'username': r.username, 'password': r.password})
elif 'host' in config:
host, port = (config['host'] + ':2379').split(':')[:2]
config['host'] = host
if 'port' not in config:
config['port'] = int(port)
if config.get('cacert'):
config['ca_cert'] = config.pop('cacert')
if config.get('key') and config.get('cert'):
config['cert'] = (config['cert'], config['key'])
for p in ('discovery_srv', 'srv_domain'):
if p in config:
config['srv'] = config.pop(p)
client = None
while not client:
try:
tests/test_config.py
+6
View File
@@ -40,6 +40,12 @@ class TestConfig(unittest.TestCase):
'PATRONI_POSTGRESQL_DATA_DIR': 'data/postgres0',
'PATRONI_POSTGRESQL_PGPASS': '/tmp/pgpass0',
'PATRONI_ETCD_HOST': '127.0.0.1:2379',
'PATRONI_ETCD_URL': 'https://127.0.0.1:2379',
'PATRONI_ETCD_PROXY': 'http://127.0.0.1:2379',
'PATRONI_ETCD_SRV': 'test',
'PATRONI_ETCD_CACERT': '/cacert',
'PATRONI_ETCD_CERT': '/cert',
'PATRONI_ETCD_KEY': '/key',
'PATRONI_CONSUL_HOST': '127.0.0.1:8500',
'PATRONI_ZOOKEEPER_HOSTS': "'host1:2181','host2:2181'",
'PATRONI_EXHIBITOR_HOSTS': 'host1,host2',
tests/test_etcd.py
+17 -12
View File
@@ -114,17 +114,17 @@ class SleepException(Exception):
pass
class MockSRV(object):
port = 2380
target = '127.0.0.1'
def dns_query(name, _):
if '-server' not in name or '-ssl' in name:
return []
if name == '_etcd-server._tcp.blabla':
return []
elif name == '_etcd-server._tcp.exception':
raise DNSException()
return [MockSRV()]
srv = Mock()
srv.port = 2380
srv.target.to_text.return_value = 'localhost' if name == '_etcd-server._tcp.foobar' else '127.0.0.1'
return [srv]
def socket_getaddrinfo(*args):
@@ -155,7 +155,7 @@ class TestClient(unittest.TestCase):
def setUp(self):
with patch.object(Client, 'machines') as mock_machines:
mock_machines.__get__ = Mock(return_value=['http://localhost:2379', 'http://localhost:4001'])
self.client = Client({'discovery_srv': 'test', 'retry_timeout': 3})
self.client = Client({'srv': 'test', 'retry_timeout': 3})
self.client.http.request = http_request
self.client.http.request_encode_body = http_request
@@ -188,22 +188,23 @@ class TestClient(unittest.TestCase):
self.assertRaises(etcd.EtcdException, self.client.api_execute, '/', 'GET')
def test_get_srv_record(self):
self.assertEquals(self.client.get_srv_record('blabla'), [])
self.assertEquals(self.client.get_srv_record('exception'), [])
self.assertEquals(self.client.get_srv_record('_etcd-server._tcp.blabla'), [])
self.assertEquals(self.client.get_srv_record('_etcd-server._tcp.exception'), [])
def test__get_machines_cache_from_srv(self):
self.client._get_machines_cache_from_srv('foobar')
self.client.get_srv_record = Mock(return_value=[('localhost', 2380)])
self.client._get_machines_cache_from_srv('blabla')
def test__get_machines_cache_from_dns(self):
self.client._get_machines_cache_from_dns('error:2379')
self.client._get_machines_cache_from_dns('error', 2379)
@patch.object(Client, 'machines')
def test__load_machines_cache(self, mock_machines):
mock_machines.__get__ = Mock(return_value=['http://localhost:2379'])
self.client._config = {}
self.assertRaises(Exception, self.client._load_machines_cache)
self.client._config = {'discovery_srv': 'blabla'}
self.client._config = {'srv': 'blabla'}
self.assertRaises(etcd.EtcdException, self.client._load_machines_cache)
@@ -228,7 +229,11 @@ class TestEtcd(unittest.TestCase):
mock_machines.__get__ = Mock(side_effect=etcd.EtcdException)
with patch('time.sleep', Mock(side_effect=SleepException)):
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'discovery_srv': 'test', 'retry_timeout': 10})
{'discovery_srv': 'test', 'retry_timeout': 10, 'cacert': '1', 'key': '1', 'cert': 1})
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'url': 'https://test:2379', 'retry_timeout': 10})
self.assertRaises(SleepException, self.etcd.get_etcd_client,
{'proxy': 'https://user:password@test:2379', 'retry_timeout': 10})
def test_get_cluster(self):
self.assertIsInstance(self.etcd.get_cluster(), Cluster)