/usr/lib/python2.7/dist-packages/kombu/pools.py is in python-kombu 3.0.33-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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kombu.pools
===========
Public resource pools.
"""
from __future__ import absolute_import
import os
from itertools import chain
from .connection import Resource
from .five import range, values
from .messaging import Producer
from .utils import EqualityDict
from .utils.functional import lazy
__all__ = ['ProducerPool', 'PoolGroup', 'register_group',
'connections', 'producers', 'get_limit', 'set_limit', 'reset']
_limit = [200]
_used = [False]
_groups = []
use_global_limit = object()
disable_limit_protection = os.environ.get('KOMBU_DISABLE_LIMIT_PROTECTION')
class ProducerPool(Resource):
Producer = Producer
def __init__(self, connections, *args, **kwargs):
self.connections = connections
self.Producer = kwargs.pop('Producer', None) or self.Producer
super(ProducerPool, self).__init__(*args, **kwargs)
def _acquire_connection(self):
return self.connections.acquire(block=True)
def create_producer(self):
conn = self._acquire_connection()
try:
return self.Producer(conn)
except BaseException:
conn.release()
raise
def new(self):
return lazy(self.create_producer)
def setup(self):
if self.limit:
for _ in range(self.limit):
self._resource.put_nowait(self.new())
def close_resource(self, resource):
pass
def prepare(self, p):
if callable(p):
p = p()
if p._channel is None:
conn = self._acquire_connection()
try:
p.revive(conn)
except BaseException:
conn.release()
raise
return p
def release(self, resource):
if resource.__connection__:
resource.__connection__.release()
resource.channel = None
super(ProducerPool, self).release(resource)
class PoolGroup(EqualityDict):
def __init__(self, limit=None):
self.limit = limit
def create(self, resource, limit):
raise NotImplementedError('PoolGroups must define ``create``')
def __missing__(self, resource):
limit = self.limit
if limit is use_global_limit:
limit = get_limit()
if not _used[0]:
_used[0] = True
k = self[resource] = self.create(resource, limit)
return k
def register_group(group):
_groups.append(group)
return group
class Connections(PoolGroup):
def create(self, connection, limit):
return connection.Pool(limit=limit)
connections = register_group(Connections(limit=use_global_limit))
class Producers(PoolGroup):
def create(self, connection, limit):
return ProducerPool(connections[connection], limit=limit)
producers = register_group(Producers(limit=use_global_limit))
def _all_pools():
return chain(*[(values(g) if g else iter([])) for g in _groups])
def get_limit():
return _limit[0]
def set_limit(limit, force=False, reset_after=False):
limit = limit or 0
glimit = _limit[0] or 0
if limit < glimit:
if not disable_limit_protection and (_used[0] and not force):
raise RuntimeError("Can't lower limit after pool in use.")
reset_after = True
if limit != glimit:
_limit[0] = limit
for pool in _all_pools():
pool.limit = limit
if reset_after:
reset()
return limit
def reset(*args, **kwargs):
for pool in _all_pools():
try:
pool.force_close_all()
except Exception:
pass
for group in _groups:
group.clear()
_used[0] = False
try:
from multiprocessing.util import register_after_fork
register_after_fork(connections, reset)
except ImportError: # pragma: no cover
pass
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