95 lines
3.8 KiB
Python
95 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from kazoo import client
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import six
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from taskflow import exceptions as exc
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def _parse_hosts(hosts):
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if isinstance(hosts, six.string_types):
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return hosts.strip()
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if isinstance(hosts, (dict)):
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host_ports = []
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for (k, v) in six.iteritems(hosts):
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host_ports.append("%s:%s" % (k, v))
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hosts = host_ports
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if isinstance(hosts, (list, set, tuple)):
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return ",".join([str(h) for h in hosts])
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return hosts
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def finalize_client(client):
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"""Stops and closes a client, even if it wasn't started."""
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client.stop()
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try:
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client.close()
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except TypeError:
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# NOTE(harlowja): https://github.com/python-zk/kazoo/issues/167
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#
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# This can be removed after that one is fixed/merged.
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pass
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def check_compatible(client, min_version=None, max_version=None):
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"""Checks if a kazook client is backed by a zookeeper server version
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that satisfies a given min (inclusive) and max (inclusive) version range.
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"""
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server_version = None
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if min_version:
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server_version = tuple((int(a) for a in client.server_version()))
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min_version = tuple((int(a) for a in min_version))
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if server_version < min_version:
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pretty_server_version = ".".join([str(a) for a in server_version])
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min_version = ".".join([str(a) for a in min_version])
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raise exc.IncompatibleVersion("Incompatible zookeeper version"
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" %s detected, zookeeper >= %s"
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" required" % (pretty_server_version,
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min_version))
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if max_version:
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if server_version is None:
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server_version = tuple((int(a) for a in client.server_version()))
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max_version = tuple((int(a) for a in max_version))
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if server_version > max_version:
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pretty_server_version = ".".join([str(a) for a in server_version])
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max_version = ".".join([str(a) for a in max_version])
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raise exc.IncompatibleVersion("Incompatible zookeeper version"
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" %s detected, zookeeper <= %s"
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" required" % (pretty_server_version,
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max_version))
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def make_client(conf):
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"""Creates a kazoo client given a configuration dictionary."""
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client_kwargs = {
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'read_only': bool(conf.get('read_only')),
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'randomize_hosts': bool(conf.get('randomize_hosts')),
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}
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hosts = _parse_hosts(conf.get("hosts", "localhost:2181"))
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if not hosts or not isinstance(hosts, six.string_types):
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raise TypeError("Invalid hosts format, expected "
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"non-empty string/list, not %s" % type(hosts))
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client_kwargs['hosts'] = hosts
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if 'timeout' in conf:
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client_kwargs['timeout'] = float(conf['timeout'])
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# Kazoo supports various handlers, gevent, threading, eventlet...
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# allow the user of this client object to optionally specify one to be
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# used.
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if 'handler' in conf:
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client_kwargs['handler'] = conf['handler']
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return client.KazooClient(**client_kwargs)
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