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# Copyright 2009 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
# pylint: disable-msg=E0611,W0212
"""Database classes including and related to CodeImportMachine."""
__metaclass__ = type
__all__ = [
'CodeImportMachine',
'CodeImportMachineSet',
]
from sqlobject import (
SQLMultipleJoin,
StringCol,
)
from zope.component import getUtility
from zope.interface import implements
from lp.code.enums import (
CodeImportMachineOfflineReason,
CodeImportMachineState,
)
from lp.code.interfaces.codeimportevent import ICodeImportEventSet
from lp.code.interfaces.codeimportmachine import (
ICodeImportMachine,
ICodeImportMachineSet,
)
from lp.services.config import config
from lp.services.database.constants import (
DEFAULT,
UTC_NOW,
)
from lp.services.database.datetimecol import UtcDateTimeCol
from lp.services.database.enumcol import EnumCol
from lp.services.database.sqlbase import SQLBase
class CodeImportMachine(SQLBase):
"""See `ICodeImportMachine`."""
_defaultOrder = ['hostname']
implements(ICodeImportMachine)
date_created = UtcDateTimeCol(notNull=True, default=DEFAULT)
hostname = StringCol(default=None)
state = EnumCol(enum=CodeImportMachineState, notNull=True,
default=CodeImportMachineState.OFFLINE)
heartbeat = UtcDateTimeCol(notNull=False)
current_jobs = SQLMultipleJoin(
'CodeImportJob', joinColumn='machine',
orderBy=['date_started', 'id'])
events = SQLMultipleJoin(
'CodeImportEvent', joinColumn='machine',
orderBy=['-date_created', '-id'])
def shouldLookForJob(self, worker_limit):
"""See `ICodeImportMachine`."""
job_count = self.current_jobs.count()
if self.state == CodeImportMachineState.OFFLINE:
return False
self.heartbeat = UTC_NOW
if self.state == CodeImportMachineState.QUIESCING:
if job_count == 0:
self.setOffline(
CodeImportMachineOfflineReason.QUIESCED)
return False
elif self.state == CodeImportMachineState.ONLINE:
return job_count < worker_limit
else:
raise AssertionError(
"Unknown machine state %r??" % self.state)
def setOnline(self, user=None, message=None):
"""See `ICodeImportMachine`."""
if self.state not in (CodeImportMachineState.OFFLINE,
CodeImportMachineState.QUIESCING):
raise AssertionError(
"State of machine %s was %s."
% (self.hostname, self.state.name))
self.state = CodeImportMachineState.ONLINE
getUtility(ICodeImportEventSet).newOnline(self, user, message)
def setOffline(self, reason, user=None, message=None):
"""See `ICodeImportMachine`."""
if self.state not in (CodeImportMachineState.ONLINE,
CodeImportMachineState.QUIESCING):
raise AssertionError(
"State of machine %s was %s."
% (self.hostname, self.state.name))
self.state = CodeImportMachineState.OFFLINE
getUtility(ICodeImportEventSet).newOffline(
self, reason, user, message)
def setQuiescing(self, user, message=None):
"""See `ICodeImportMachine`."""
if self.state != CodeImportMachineState.ONLINE:
raise AssertionError(
"State of machine %s was %s."
% (self.hostname, self.state.name))
self.state = CodeImportMachineState.QUIESCING
getUtility(ICodeImportEventSet).newQuiesce(self, user, message)
class CodeImportMachineSet(object):
"""See `ICodeImportMachineSet`."""
implements(ICodeImportMachineSet)
def getAll(self):
"""See `ICodeImportMachineSet`."""
return CodeImportMachine.select()
def getByHostname(self, hostname):
"""See `ICodeImportMachineSet`."""
return CodeImportMachine.selectOneBy(hostname=hostname)
def new(self, hostname, state=CodeImportMachineState.OFFLINE):
"""See `ICodeImportMachineSet`."""
machine = CodeImportMachine(hostname=hostname, heartbeat=None)
if state == CodeImportMachineState.ONLINE:
machine.setOnline()
elif state != CodeImportMachineState.OFFLINE:
raise AssertionError(
"Invalid machine creation state: %r." % state)
return machine
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