124 lines
4.2 KiB
Python
124 lines
4.2 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# Copyright 2021 Ubuntu
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# See LICENSE file for licensing details.
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import hashlib
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import json
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import interface_hacluster.common as common
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from ops.framework import (
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StoredState,
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EventBase,
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ObjectEvents,
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EventSource,
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Object)
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class HAServiceReadyEvent(EventBase):
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pass
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class HAServiceEvents(ObjectEvents):
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ha_ready = EventSource(HAServiceReadyEvent)
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class HAServiceRequires(Object, common.ResourceManagement):
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on = HAServiceEvents()
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_stored = StoredState()
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def __init__(self, charm, relation_name):
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super().__init__(charm, relation_name)
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self.relation_name = relation_name
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self.framework.observe(
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charm.on[self.relation_name].relation_changed,
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self._on_relation_changed)
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self._stored.set_default(
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resources={})
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def get_local(self, key, default=None):
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key = '%s.%s' % ('local-data', key)
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json_value = getattr(self._stored, key, None)
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if json_value:
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return json.loads(json_value)
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if default:
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return default
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return None
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def set_local(self, key=None, value=None, data=None, **kwdata):
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if data is None:
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data = {}
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if key is not None:
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data[key] = value
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data.update(kwdata)
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if not data:
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return
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for k, v in data.items():
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setattr(
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self._stored,
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'local-data.{}'.format(k),
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json.dumps(v))
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def _on_relation_changed(self, event):
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if self.is_clustered():
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self.on.ha_ready.emit()
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def data_changed(self, data_id, data, hash_type='md5'):
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"""Check if the given set of data has changed since the previous call.
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This works by hashing the JSON-serialization of the data. Note that,
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while the data will be serialized using ``sort_keys=True``, some types
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of data structures, such as sets, may lead to false positivies.
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NOTE: This method is adapted from the charms.reactive framework and
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is used by the parent class `common.ResourceManagement`. It is unlikely
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that a charm utilising this interface would call this method directly.
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:param str data_id: Unique identifier for this set of data.
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:param data: JSON-serializable data.
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:param str hash_type: Any hash algorithm supported by :mod:`hashlib`.
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"""
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key = 'data_changed.%s' % data_id
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alg = getattr(hashlib, hash_type)
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serialized = json.dumps(data, sort_keys=True).encode('utf8')
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old_hash = self.get_local(key)
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new_hash = alg(serialized).hexdigest()
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self.set_local(key, new_hash)
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return old_hash != new_hash
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def set_remote(self, key=None, value=None, data=None, **kwdata):
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if data is None:
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data = {}
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if key is not None:
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data[key] = value
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data.update(kwdata)
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if not data:
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return
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for relation in self.framework.model.relations[self.relation_name]:
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for k, v in data.items():
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# The reactive framework copes with integer values but the ops
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# framework insists on strings so convert them.
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if isinstance(v, int):
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v = str(v)
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relation.data[self.model.unit][k] = v
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def get_remote_all(self, key, default=None):
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"""Return a list of all values presented by remote units for key"""
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values = []
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for relation in self.framework.model.relations[self.relation_name]:
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for unit in relation.units:
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value = relation.data[unit].get(key)
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if value:
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values.append(value)
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return list(set(values))
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