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# This file is part of Tryton. The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
import datetime as dt
import logging
import random
import selectors
import signal
import time
from multiprocessing import Pool as MPool
from multiprocessing import cpu_count
from sql import Flavor
from trytond import backend
from trytond.config import config
from trytond.exceptions import UserError, UserWarning
from trytond.pool import Pool
from trytond.status import processing
from trytond.transaction import Transaction, TransactionError
__all__ = ['work']
logger = logging.getLogger(__name__)
class Queue(object):
def __init__(self, database_name, mpool):
self.database = backend.Database(database_name).connect()
self.connection = self.database.get_connection(autocommit=True)
self.mpool = mpool
def pull(self, name=None):
database_list = Pool.database_list()
pool = Pool(self.database.name)
if self.database.name not in database_list:
with Transaction().start(self.database.name, 0, readonly=True):
pool.init()
Queue = pool.get('ir.queue')
return Queue.pull(self.database, self.connection, name=name)
def run(self, task_id):
return self.mpool.apply_async(run_task, (self.database.name, task_id))
class TaskList(list):
def filter(self):
for t in list(self):
if t.ready():
self.remove(t)
return self
def work(options):
Flavor.set(backend.Database.flavor)
if not config.getboolean('queue', 'worker', default=False):
return
try:
processes = options.processes or cpu_count()
except NotImplementedError:
processes = 1
logger.info("start %d workers", processes)
mpool = MPool(
processes, initializer, (options.database_names,),
options.maxtasksperchild)
queues = [Queue(name, mpool) for name in options.database_names]
tasks = TaskList()
selector = selectors.DefaultSelector()
for queue in queues:
selector.register(queue.connection, selectors.EVENT_READ)
try:
while True:
timeout = options.timeout
# Add some randomness to avoid concurrent pulling
time.sleep(0.1 * random.random())
while len(tasks.filter()) >= processes:
time.sleep(0.1)
for queue in queues:
try:
task_id, next_ = queue.pull(options.name)
except backend.DatabaseOperationalError:
break
if next_ is not None:
timeout = min(next_, timeout)
if task_id:
tasks.append(queue.run(task_id))
break
else:
for key, _ in selector.select(timeout=timeout):
connection = key.fileobj
connection.poll()
while connection.notifies:
connection.notifies.pop(0)
except KeyboardInterrupt:
mpool.close()
finally:
selector.close()
def initializer(database_names, worker=True):
if worker:
signal.signal(signal.SIGINT, signal.SIG_IGN)
pools = []
database_list = Pool.database_list()
for database_name in database_names:
pool = Pool(database_name)
if database_name not in database_list:
with Transaction().start(database_name, 0, readonly=True):
pool.init()
pools.append(pool)
return pools
def run_task(pool, task_id):
if not isinstance(pool, Pool):
database_list = Pool.database_list()
pool = Pool(pool)
if pool.database_name not in database_list:
with Transaction().start(pool.database_name, 0, readonly=True):
pool.init()
Queue = pool.get('ir.queue')
Error = pool.get('ir.error')
def duration():
return (time.monotonic() - started) * 1000
started = time.monotonic()
name = '<Task %s@%s>' % (task_id, pool.database_name)
retry = config.getint('database', 'retry')
try:
count = 0
transaction_extras = {}
while True:
if count:
time.sleep(0.02 * count)
with Transaction().start(
pool.database_name, 0,
**transaction_extras) as transaction:
try:
try:
task, = Queue.search([('id', '=', task_id)])
except ValueError:
# the task was rollbacked, nothing to do
break
with processing(name):
task.run()
break
except TransactionError as e:
transaction.rollback()
e.fix(transaction_extras)
continue
except backend.DatabaseOperationalError:
if count < retry:
transaction.rollback()
count += 1
logger.debug("Retry: %i", count)
continue
raise
except (UserError, UserWarning) as e:
Error.report(task, e)
raise
logger.info("%s in %i ms", name, duration())
except backend.DatabaseOperationalError:
logger.info(
"%s failed after %i ms, retrying", name, duration(),
exc_info=logger.isEnabledFor(logging.DEBUG))
if not config.getboolean('queue', 'worker', default=False):
time.sleep(0.02 * retry)
try:
with Transaction().start(pool.database_name, 0) as transaction:
if not transaction.database.has_channel():
logger.critical('%s failed', name, exc_info=True)
return
task = Queue(task_id)
if task.scheduled_at and task.enqueued_at < task.scheduled_at:
duration = (task.scheduled_at - task.enqueued_at) * 2
else:
duration = dt.timedelta(seconds=2 * retry)
duration = min(duration, dt.timedelta(hours=1))
scheduled_at = dt.datetime.now() + duration * random.random()
Queue.push(task.name, task.data, scheduled_at=scheduled_at)
except Exception:
logger.critical(
"rescheduling %s failed", name, exc_info=True)
except (UserError, UserWarning):
logger.info(
"%s failed after %i ms", name, duration(),
exc_info=logger.isEnabledFor(logging.DEBUG))
except Exception:
logger.critical(
"%s failed after %i ms", name, duration(), exc_info=True)
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