On Wednesday, 22 August 2012 22:03:48 UTC+10, sajuptpm wrote: > Hi, > > > > psphere: Python interface for the VMware vSphere Web Services SDK > > > > I already developed an app using https://bitbucket.org/jkinred/psphere. But > getting lot of errors since psphere is not thread safe (I think). So i wrote > couple of scripts to test it (See attached files) and found that caching > mechanism used by psphere is not thread safe. Could someone please give me > some suggestion to make it thread safe. > > > > > > =======Test Code ======== > > > > import psphere > > from psphere.client import Client > > from psphere.managedobjects import HostSystem, VirtualMachine, ComputeResource > > client = Client("192.168.0.114", "root", "vmware1") ##vCenter > > print "\nSucessfully connected to vCenter.\n" > > > > from threading import Thread > > > > def myfunc(i): > > host1 = HostSystem.get(client, name="192.168.0.134") > > host2 = HostSystem.get(client, name="192.168.0.113") > > print "----i------",i > > while True: > > #host1.update(properties=["config", "vm"]) > > #host2.update(properties=["config", "vm"]) > > c = type(host1.config.network) > > v = type(host2.config.network) > > for vm in host1.vm: > > k = vm.config.template > > for vm in host2.vm: > > p = vm.config.template > > > > > > for i in range(10): > > t = Thread(target=myfunc, args=(i,)) > > t.start() > > > > > > """ > > OUTPUT > > ======= > > Sucessfully connected to vCenter. > > > > ----i------ 1 > > ----i------ 3 > > ----i------ 5 > > ----i------ 0 > > ----i------ 4 > > ----i------ 2----i------ 7 > > ----i------ > > 9 > > ----i------ 6 > > ----i------ 8 > > Exception in thread Thread-4: > > Traceback (most recent call last): > > File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner > > self.run() > > File "/usr/lib/python2.7/threading.py", line 504, in run > > self.__target(*self.__args, **self.__kwargs) > > File "vcenter_test1.py", line 19, in myfunc > > k = vm.config.template > > File "/home/saju/cvt/trunk/src/cvt/web/cvt/psphere/__init__.py", line 79, > in __get__ > > value = self.fget(inst) > > File "/home/saju/cvt/trunk/src/cvt/web/cvt/psphere/managedobjects.py", line > 1236, in config > > return self._get_dataobject("config", False) > > File "/home/saju/cvt/trunk/src/cvt/web/cvt/psphere/__init__.py", line 116, > in _get_dataobject > > return self._cache[name][0] > > KeyError: 'config' > > > > Exception in thread Thread-6: > > Traceback (most recent call last): > > File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner > > self.run() > > File "/usr/lib/python2.7/threading.py", line 504, in run > > self.__target(*self.__args, **self.__kwargs) > > File "vcenter_test1.py", line 17, in myfunc > > v = type(host2.config.network) > > AttributeError: VirtualMachineConfigInfo instance has no attribute 'network' > > > > > > > > """
I'm the author of psphere. I'd be really interested to get some experienced insight into this as I really don't know the first thing about thread safety. psphere does use a cache, but I'm confused as to how the cache would be thread unsafe as the cache is just a property of an object. What I'm suspecting (and this only came to me while writing this post) is that I have a "client" object which is passed into each object and used to retrieve data from the server. See this gist: https://gist.github.com/3478641 When used in a threaded scenario could the client be used by multiple objects simultaneously and the replies would come in out of order? A couple of years ago I started psphere to learn Python and I always hoped that I would have an experienced developer join me. I did learn Python but I never got that experienced developer so when it comes to issues like this I'm definitely out of my depth! Please if someone could spend the time with me I would really appreciate it! -- http://mail.python.org/mailman/listinfo/python-list
