使用Python时,多处理无法将LDAP对象共享给子进程
我将有一个子进程发送LDAP查询,另一个子进程检索响应。 在两个进程之间共享LDAP对象存在问题。有人能告诉我一个解决办法吗使用Python时,多处理无法将LDAP对象共享给子进程,python,multiprocessing,python-ldap,python-multiprocessing,Python,Multiprocessing,Python Ldap,Python Multiprocessing,我将有一个子进程发送LDAP查询,另一个子进程检索响应。 在两个进程之间共享LDAP对象存在问题。有人能告诉我一个解决办法吗 import ldap from multiprocessing import Process def send_ldap(ldap_conn): print ldap_conn def receive_ldap(ldap_conn): print ldap_conn def main(): ldap_conn = ldap.initial
import ldap
from multiprocessing import Process
def send_ldap(ldap_conn):
print ldap_conn
def receive_ldap(ldap_conn):
print ldap_conn
def main():
ldap_conn = ldap.initialize('ldap://abc:12345')
ldap_sender = Process(target=send_ldap, args=(ldap_conn,))
ldap_receiver = Process(target=receive_ldap, args=(ldap_conn,))
ldap_sender.start()
if __name__ == '__main__':
main()
pickle模块出现错误:
Traceback (most recent call last):
File "t.py", line 22, in <module>
main()
File "t.py", line 16, in main
ldap_sender.start()
File "c:\python27\lib\multiprocessing\process.py", line 130, in start
self._popen = Popen(self)
File "c:\python27\lib\multiprocessing\forking.py", line 277, in __init__
dump(process_obj, to_child, HIGHEST_PROTOCOL)
File "c:\python27\lib\multiprocessing\forking.py", line 199, in dump
ForkingPickler(file, protocol).dump(obj)
File "c:\python27\lib\pickle.py", line 224, in dump
self.save(obj)
File "c:\python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "c:\python27\lib\pickle.py", line 419, in save_reduce
save(state)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "c:\python27\lib\pickle.py", line 681, in _batch_setitems
save(v)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 548, in save_tuple
save(element)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 725, in save_inst
save(stuff)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "c:\python27\lib\pickle.py", line 681, in _batch_setitems
save(v)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 725, in save_inst
save(stuff)
File "c:\python27\lib\pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 649, in save_dict
self._batch_setitems(obj.iteritems())
File "c:\python27\lib\pickle.py", line 681, in _batch_setitems
save(v)
File "c:\python27\lib\pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
Traceback (most recent call last):
File "c:\python27\lib\pickle.py", line 396, in save_reduce
File "<string>", line 1, in <module>
File "c:\python27\lib\multiprocessing\forking.py", line 381, in main
save(cls)
File "c:\python27\lib\pickle.py", line 286, in save
self = load(from_parent)
File "c:\python27\lib\pickle.py", line 1378, in load
f(self, obj) # Call unbound method with explicit self
File "c:\python27\lib\pickle.py", line 748, in save_global
return Unpickler(file).load()
File "c:\python27\lib\pickle.py", line 858, in load
(obj, module, name))
pickle.PicklingError: Can't pickle <type 'thread.lock'>: it's not found as thread.lock
dispatch[key](self)
File "c:\python27\lib\pickle.py", line 880, in load_eof
raise EOFError
EOFError
回溯(最近一次呼叫最后一次):
文件“t.py”,第22行,在
main()
文件“t.py”,第16行,主
ldap_sender.start()
文件“c:\python27\lib\multiprocessing\process.py”,第130行,在开始处
self.\u popen=popen(self)
文件“c:\python27\lib\multiprocessing\forking.py”,第277行,在\uuu init中__
转储(进程对象、到子进程、最高\u协议)
文件“c:\python27\lib\multiprocessing\forking.py”,第199行,在转储中
ForkingPickler(文件、协议).dump(obj)
文件“c:\python27\lib\pickle.py”,第224行,位于转储文件中
自我保存(obj)
文件“c:\python27\lib\pickle.py”,第331行,保存
自我保存(obj=obj,*rv)
文件“c:\python27\lib\pickle.py”,第419行,在save\u reduce中
保存(状态)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
保存目录中第649行的文件“c:\python27\lib\pickle.py”
self.\u batch\u setitems(obj.iteritems())
文件“c:\python27\lib\pickle.py”,第681行,在批处理设置项中
保存(v)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
文件“c:\python27\lib\pickle.py”,第548行,在save\u tuple中
保存(元素)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
文件“c:\python27\lib\pickle.py”,第725行,在save\u inst中
保存(东西)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
保存目录中第649行的文件“c:\python27\lib\pickle.py”
self.\u batch\u setitems(obj.iteritems())
文件“c:\python27\lib\pickle.py”,第681行,在批处理设置项中
保存(v)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
文件“c:\python27\lib\pickle.py”,第725行,在save\u inst中
保存(东西)
文件“c:\python27\lib\pickle.py”,第286行,保存
f(self,obj)#用显式self调用未绑定方法
保存目录中第649行的文件“c:\python27\lib\pickle.py”
self.\u batch\u setitems(obj.iteritems())
文件“c:\python27\lib\pickle.py”,第681行,在批处理设置项中
保存(v)
文件“c:\python27\lib\pickle.py”,第331行,保存
自我保存(obj=obj,*rv)
回溯(最近一次呼叫最后一次):
文件“c:\python27\lib\pickle.py”,第396行,在save\u reduce中
文件“”,第1行,在
文件“c:\python27\lib\multiprocessing\forking.py”,第381行,在main中
保存(cls)
文件“c:\python27\lib\pickle.py”,第286行,保存
self=加载(从父级)
加载文件“c:\python27\lib\pickle.py”,第1378行
f(self,obj)#用显式self调用未绑定方法
文件“c:\python27\lib\pickle.py”,第748行,在save\u global中
返回Unpickler(file.load())
加载文件“c:\python27\lib\pickle.py”,第858行
(对象、模块、名称))
pickle.PicklingError:无法pickle:未将其作为thread.lock找到
调度[键](自身)
文件“c:\python27\lib\pickle.py”,第880行,在load\u eof中
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问题在于ldap\u conn
对象不可拾取,这是在Windows中的进程之间发送它所必需的。它不可拾取,因为它在内部使用了一些不可拾取的线程。锁定对象。图书馆实际上声称提供了一个应该是可拾取的,但它坏了,也不可拾取。不过,我们可以通过将其子类化并修复bug来修复此问题(它会在酸洗之前错过移除一个内部锁):
现在,对象将被pickle处理好,这意味着它应该可以用于多处理
目的。我还解决了重新连接ldapObject
不可拾取的问题。我遇到了这个问题,除了我定义的自定义类而不是LDAP对象。我的类包含一组需要子进程访问的不同数据对象,包括multiprocessing.lock,它是两个线程操作的一部分。有什么解决办法吗?我能把句柄传递给每个需要访问的对象吗?(我真的不明白为什么/如何在这里使用pickle,我也不熟悉LDAP)
from ldap.ldapobject import ReconnectLDAPObject
from multiprocessing import Process
import ldap
class PicklableLDAPObject(ReconnectLDAPObject):
def __getstate__(self):
d = ReconnectLDAPObject.__getstate__(self)
del d['_reconnect_lock']
return d
def __setstate__(self, d):
self._reconnect_lock = ldap.LDAPLock(desc='reconnect lock within %s' % (repr(self)))
ReconnectLDAPObject.__setstate__(self, d)
def send_ldap(ldap_conn):
print ldap_conn
def receive_ldap(ldap_conn):
print ldap_conn
def main():
#ldap_conn = ldap.initialize('ldap://abc:12345')
ldap_conn = PicklableLDAPObject('ldap://abc:12345')
ldap_sender = Process(target=send_ldap, args=(ldap_conn,))
ldap_receiver = Process(target=receive_ldap, args=(ldap_conn,))
ldap_sender.start()