126 lines
3.8 KiB
Python
126 lines
3.8 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
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# 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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"""Cache for nodes currently under discovery."""
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import logging
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import sqlite3
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import time
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from ironic_discoverd import conf
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from ironic_discoverd import utils
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LOG = logging.getLogger("discoverd")
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_DB = None
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_SCHEMA = """
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create table if not exists nodes
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(uuid text primary key, started_at real);
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create table if not exists attributes
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(name text, value text, uuid text,
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primary key (name, value),
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foreign key (uuid) references nodes);
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"""
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def init():
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"""Initialize the database."""
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global _DB
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conn = conf.get('discoverd', 'database') or ':memory:'
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_DB = sqlite3.connect(conn)
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_DB.executescript(_SCHEMA)
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def _db():
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if _DB is None:
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init()
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return _DB
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def add_node(uuid, **attributes):
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"""Store information about a node under discovery.
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All existing information about this node is dropped.
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Empty values are skipped.
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:param uuid: Ironic node UUID
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:param attributes: attributes known about this node (like macs, BMC etc)
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"""
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drop_node(uuid)
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with _db():
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_db().execute("insert into nodes(uuid, started_at) "
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"values(?, ?)", (uuid, time.time()))
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for (name, value) in attributes.items():
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if not value:
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continue
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if not isinstance(value, list):
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value = [value]
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try:
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_db().executemany("insert into attributes(name, value, uuid) "
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"values(?, ?, ?)",
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[(name, v, uuid) for v in value])
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except sqlite3.IntegrityError:
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raise utils.DiscoveryFailed(
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'Some or all of %(name)s\'s %(value)s are already '
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'on discovery' %
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{'name': name, 'value': value})
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def drop_node(uuid):
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"""Forget information about node with given uuid."""
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with _db():
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_db().execute("delete from nodes where uuid=?", (uuid,))
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_db().execute("delete from attributes where uuid=?", (uuid,))
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def pop_node(**attributes):
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"""Find node in cache.
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This function also deletes a node from the cache, thus it's name.
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:param attributes: attributes known about this node (like macs, BMC etc)
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:returns: UUID or None
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"""
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# NOTE(dtantsur): sorting is not required, but gives us predictability
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found = set()
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for (name, value) in sorted(attributes.items()):
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if not value:
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LOG.warning('Empty value for attribute %s', name)
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continue
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if not isinstance(value, list):
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value = [value]
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LOG.debug('Trying to use %s %s for discovery' % (name, value))
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rows = _db().execute('select distinct uuid from attributes where ' +
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' OR '.join('name=? AND value=?' for _ in value),
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sum(([name, v] for v in value), [])).fetchall()
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if rows:
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found.update(item[0] for item in rows)
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if not found:
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LOG.error('Could not find a node based on attributes %s',
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list(attributes))
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return
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elif len(found) > 1:
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LOG.error('Multiple nodes were matched based on attributes %(keys)s: '
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'%(uuids)s',
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{'keys': list(attributes),
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'uuids': list(found)})
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return
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uuid = found.pop()
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drop_node(uuid)
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return uuid
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