f47d7bad34
Stale data is read from the db-router relation if the leader is not the lowest numbered unit. This change refactors the requires module to use Endpoint class to enable use of app-bag to read the app-data. Partial-bug: #1989505 Change-Id: I5bcf9362cd7f6adea308942013dac37e84a6c504
132 lines
4.9 KiB
Python
132 lines
4.9 KiB
Python
# Copyright 2019 Canonical Ltd
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#
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# 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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from charms import reactive
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import charmhelpers.contrib.network.ip as ch_net_ip
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class MySQLRouterProvides(reactive.Endpoint):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.ingress_address = ch_net_ip.get_relation_ip(self.endpoint_name)
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def relation_ids(self):
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return [x.relation_id for x in self.relations]
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def set_ingress_address(self):
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for relation in self.relations:
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relation.to_publish_raw["ingress-address"] = self.ingress_address
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relation.to_publish_raw["private-address"] = self.ingress_address
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def available(self):
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for unit in self.all_joined_units:
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# Check for prefixed username
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for key in unit.received.keys():
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if "_username" in key:
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return True
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return False
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def set_or_clear_available(self):
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if self.available():
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reactive.set_flag(self.expand_name('{endpoint_name}.available'))
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else:
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reactive.clear_flag(self.expand_name('{endpoint_name}.available'))
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@reactive.when('endpoint.{endpoint_name}.joined')
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def joined(self):
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reactive.set_flag(self.expand_name('{endpoint_name}.connected'))
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self.set_ingress_address()
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self.set_or_clear_available()
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@reactive.when('endpoint.{endpoint_name}.changed')
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def changed(self):
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flags = (
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self.expand_name(
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'endpoint.{endpoint_name}.changed.database'),
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self.expand_name(
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'endpoint.{endpoint_name}.changed.username'),
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self.expand_name(
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'endpoint.{endpoint_name}.changed.hostname'),
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)
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if reactive.all_flags_set(*flags):
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for flag in flags:
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reactive.clear_flag(flag)
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self.set_or_clear_available()
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def remove(self):
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flags = (
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self.expand_name('{endpoint_name}.connected'),
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self.expand_name('{endpoint_name}.available'),
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)
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for flag in flags:
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reactive.clear_flag(flag)
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@reactive.when('endpoint.{endpoint_name}.broken')
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def broken(self):
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self.remove()
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@reactive.when('endpoint.{endpoint_name}.departed')
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def departed(self):
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self.remove()
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def set_db_connection_info(
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self, relation_id, db_host, password,
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allowed_units=None, prefix=None, wait_timeout=None,
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ssl_ca=None):
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"""Send database connection information to the client.
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:param relation_id: Relation ID to set connection information on
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:type relation_id: str
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:param db_host: Host IP or hostname for connecting to the DB
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:type db_host: str
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:param wait_timeout: Non-interactive wait timeout in seconds
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:type wait_timeout: int
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:param password: Password for connecting to the DB
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:type password: str
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:param allowed_units: Space delimited unit names allowed to connect to
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the DB.
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:type allowed_units: str
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:param prefix: Prefix to use for responses.
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:type prefix: str
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:side effect: Data is set on the relation
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:returns: None, this function is called for its side effect
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:rtype: None
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"""
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self._set_db_connection_info(
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getattr(self.relations[relation_id], 'to_publish_app'),
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db_host, password, allowed_units, prefix, wait_timeout, ssl_ca)
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# NOTE(ganso): Deprecated non-app-bag data for backwards compatibility
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self._set_db_connection_info(
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getattr(self.relations[relation_id], 'to_publish'),
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db_host, password, allowed_units, prefix, wait_timeout, ssl_ca)
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def _set_db_connection_info(
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self, publish_prop, db_host, password,
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allowed_units=None, prefix=None, wait_timeout=None,
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ssl_ca=None):
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# No prefix for db_host or wait_timeout
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publish_prop["db_host"] = db_host
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if wait_timeout:
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publish_prop["wait_timeout"] = wait_timeout
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if ssl_ca:
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publish_prop["ssl_ca"] = ssl_ca
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if not prefix:
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publish_prop["password"] = password
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publish_prop["allowed_units"] = allowed_units
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else:
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publish_prop["{}_password".format(prefix)] = password
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publish_prop["{}_allowed_units".format(prefix)] = allowed_units
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