forked from uncloud/uncloud
127 lines
3.8 KiB
Python
127 lines
3.8 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# 2020 Nico Schottelius (nico.schottelius at ungleich.ch)
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#
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# This file is part of uncloud.
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#
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# uncloud is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# uncloud is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with uncloud. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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import etcd3
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import json
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import logging
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from functools import wraps
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from uncloud import UncloudException
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log = logging.getLogger(__name__)
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def readable_errors(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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try:
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return func(*args, **kwargs)
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except etcd3.exceptions.ConnectionFailedError as e:
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raise UncloudException('Cannot connect to etcd: is etcd running and reachable? {}'.format(e))
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except etcd3.exceptions.ConnectionTimeoutError as e:
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raise UncloudException('etcd connection timeout. {}'.format(e))
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return wrapper
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class DB(object):
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def __init__(self, config, prefix="/"):
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self.config = config
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# Root for everything
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self.base_prefix= '/nicohack'
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# Can be set from outside
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self.prefix = prefix
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try:
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self.connect()
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except FileNotFoundError as e:
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raise UncloudException("Is the path to the etcd certs correct? {}".format(e))
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@readable_errors
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def connect(self):
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self._db_clients = []
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for endpoint in self.config.etcd_hosts:
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client = etcd3.client(host=endpoint, **self.config.etcd_args)
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self._db_clients.append(client)
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def realkey(self, key):
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return "{}{}/{}".format(self.base_prefix,
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self.prefix,
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key)
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@readable_errors
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def get(self, key, as_json=False, **kwargs):
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value, _ = self._db_clients[0].get(self.realkey(key), **kwargs)
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if as_json:
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value = json.loads(value)
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return value
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@readable_errors
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def get_prefix(self, key, as_json=False, **kwargs):
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for value, meta in self._db_clients[0].get_prefix(self.realkey(key), **kwargs):
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k = meta.key.decode("utf-8")
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value = value.decode("utf-8")
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if as_json:
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value = json.loads(value)
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yield (k, value)
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@readable_errors
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def set(self, key, value, as_json=False, **kwargs):
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if as_json:
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value = json.dumps(value)
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log.debug("Setting {} = {}".format(self.realkey(key), value))
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# FIXME: iterate over clients in case of failure ?
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return self._db_clients[0].put(self.realkey(key), value, **kwargs)
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@readable_errors
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def increment(self, key, **kwargs):
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print(self.realkey(key))
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print("prelock")
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lock = self._db_clients[0].lock('/nicohack/foo')
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print("prelockacq")
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lock.acquire()
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print("prelockrelease")
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lock.release()
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with self._db_clients[0].lock("/nicohack/mac/last_used_index") as lock:
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print("in lock")
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pass
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# with self._db_clients[0].lock(self.realkey(key)) as lock:# value = int(self.get(self.realkey(key), **kwargs))
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# self.set(self.realkey(key), str(value + 1), **kwargs)
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if __name__ == '__main__':
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endpoints = [ "https://etcd1.ungleich.ch:2379",
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"https://etcd2.ungleich.ch:2379",
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"https://etcd3.ungleich.ch:2379" ]
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db = DB(url=endpoints)
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