Source code for piwheels.master.the_architect

# The piwheels project
#   Copyright (c) 2017 Ben Nuttall <https://github.com/bennuttall>
#   Copyright (c) 2017 Dave Jones <dave@waveform.org.uk>
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"""
Defines :class:`TheArchitect` task; see class for more details.

.. autoclass:: TheArchitect
    :members:
"""

from datetime import timedelta

from psycopg2.extensions import QueryCanceledError

from .. import protocols, tasks, transport
from .db import Database


[docs]class TheArchitect(tasks.Task): """ This task queries the backend database to determine which versions of packages have yet to be built (and aren't marked to be skipped). It pushes the results to :class:`~.slave_driver.SlaveDriver` to sort out. """ name = 'master.the_architect' def __init__(self, config): super().__init__(config) self.db = Database(config.dsn) self.builds_queue = self.socket( transport.PUSH, protocol=protocols.the_architect) self.builds_queue.hwm = 10 self.builds_queue.connect(config.builds_queue) self.every(timedelta(minutes=1), self.update_build_queue) self.can_cancel = False
[docs] def close(self): self.db.close() super().close()
[docs] def quit(self): """ Overridden to cancel any existing long-running query. """ if self.can_cancel: self.db._conn.connection.cancel() super().quit()
[docs] def update_build_queue(self): """ The architect simply runs the build queue query repeatedly, with a break of a minute between each execution. All entries found within this limit are sorted into per-ABI queues and pushed to :class:`~.slave_driver.SlaveDriver` which queues and dispatches jobs to build ABI-matched slaves as they become available. """ self.can_cancel = True try: self.builds_queue.send_msg( 'QUEUE', self.db.get_build_queue(100000)) except QueryCanceledError: self.logger.warning('Cancelled query during shutdown') finally: self.can_cancel = False