I would avoid calls like OwnetProxy(host).read(prop).strip()
you should reuse the proxy object between calls: __init__(self, ....) self.proxy = OwnetProxy(host) def method(self, ...) self.proxy.read(prop).strip() There is a cost in creating the proxy object, but no significant resource is associated with storing this object. I'm not 100% sure, but my code should be thread safe, so you can store a single proxy object for each owserver you query, and share it among different threads. Stefano On 28 Mar 2014, at 22:09, Colin Reese <colin.re...@gmail.com> wrote: > Ok, after becoming thoroughly annoyed with owpython, I wrote around > pyownet. See the first three functions/classes. I did not install > pyownet, but located it in a subdirectory. I will add sufficient > attribution when I get a minute. Let me know what you think. > > https://github.com/iinnovations/iicontrollibs/blob/master/cupid/owfslib.py > > Colin > > > On 3/28/2014 10:57, Stefano Miccoli wrote: >> Is there a reason for using ow (which is a SWIG binding of the owlib C >> API) and not ownet (which is a pure python implementation of the ownet >> protocol)? >> >> If you do not have to access the bus master directly from python but you >> have an owserver running, I would suggest using instead ownet, or even >> better (shameless self promotion) my own pyownet. >> >> pyownet is on pypi, so to install it you can just >> >> # pip install pyownet >> >> or if you prefer the source you can get it from >> >> https://github.com/miccoli/pyownet/releases/latest >> >> and run >> >> # python setup.py install >> >> If you have an owserver running on localhost minimal instructions are >> >>>>> from pyownet.protocol import OwnetProxy >>>>> proxy = OwnetProxy() >>>>> for i in proxy.dir(): >> ... print i >> ... >> /26.64A340010000/ >> /26.2BA640010000/ >> /01.984087150000/ >>>>> proxy.read('/26.64A340010000/temperature') >> ' 20.6562' >>>>> >> >> The proxy object acts as (you guess) a proxy for the owserver, with >> methods that implement the following ownet messages: >> >> dir >> ping >> present >> read >> write >> >> Docs are still to be written but >> >>>>> help(OwnetProxy) >> >> is a good starting point. >> >> Stefano >> >> >> On 28 Mar 2014, at 16:38, Colin Reese <colin.re...@gmail.com >> <mailto:colin.re...@gmail.com>> wrote: >> >>> Hell all, >>> >>> I've run into an interesting error that results in sensors disappearing >>> altogether, resulting in the error: >>> >>> File "/usr/lib/python2.7/dist-packages/ow/__init__.py", line 271, in >>> __init__ >>> self.useCache( self._useCache ) >>> File "/usr/lib/python2.7/dist-packages/ow/__init__.py", line 417, in >>> useCache >>> for n in owfs_get( self._usePath ).split( ',' ) ] ) >>> File "/usr/lib/python2.7/dist-packages/ow/__init__.py", line 159, in >>> _get >>> raise exUnknownSensor(path) >>> ow.exUnknownSensor: '/' >>> >>> >>> Sure enough, my 1Wire directory is empty except the bus. Killing owfs, >>> owserver and owhttpd and attempting to restart using the same commands I >>> do at startup yields: >>> >>> DEFAULT: owlib.c:(56) No valid 1-wire buses found >>> >>> After rebooting, everything is fine again, until I run the questionable >>> script. So the first question is how to reinitialize after fail without >>> rebooting. The next is how to not have it fail in the first place. I see >>> mention here, but no solution: >>> http://owfs-developers.1086194.n5.nabble.com/Bug-in-re-init-ing-Python-ow-module-td4442.html >>> >>> >>> What I'm using in owpython is pretty basic, and trimming out other code >>> is really: >>> >>> import ow >>> ow.init('localhost:4304') >>> for sensor in ow.Sensor('/').sensorList(): >>> # do stuff >>> >>> Interestingly, if I have this in a function like: >>> >>> def myowfsfun(args): >>> ow.init('localhost:4304') >>> for sensor in ow.Sensor('/').sensorList(): >>> #do stuff >>> >>> if __name__ == "__main__": >>> myowfsfun(args) >>> >>> >>> I can run the function via the script file until the cows come home. If >>> I import it into another script, e.g.: >>> >>> import owfslib >>> >>> owfslib.myowfsfun(args) >>> >>> and then run that script, it barfs immediately. >>> >>> Ideas? >>> >>> Thanks, >>> Colin >>> >>> ------------------------------------------------------------------------------ >>> _______________________________________________ >>> Owfs-developers mailing list >>> Owfs-developers@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >> >> >> ------------------------------------------------------------------------------ >> >> >> >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > > ------------------------------------------------------------------------------ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers
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