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View Code? Open in Web Editor NEWExtension to add notifications system to the pycups library (https://github.com/OpenPrinting/pycups)
License: MIT License
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Only last subscription is being triggered
I am trying to use this library to trigger two functions, one for job related events and the other for printer related events. However, only the last subscription I have made, is being triggered.
from time import sleep
def on_cups_printer_event(evt):
print('Printer event')
print(evt)
def on_cups_job_event(evt):
print('Job event')
print(evt)
cups_subscription.subscribe(on_cups_job_event, [event.CUPS_EVT_JOB_CREATED, event.CUPS_EVT_JOB_COMPLETED, event.CUPS_EVT_JOB_STOPPED])
sleep(60)
cups_subscription.subscribe(on_cups_printer_event, [event.CUPS_EVT_PRINTER_ADDED, event.CUPS_EVT_PRINTER_MODIFIED, event.CUPS_EVT_PRINTER_DELETED, event.CUPS_EVT_PRINTER_CHANGED, event.CUPS_EVT_PRINTER_CONFIG_CHANGED, event.CUPS_EVT_PRINTER_STATE_CHANGED])Doing this (left out the cups subscription) it will trigger on adding and removing jobs for 60 seconds, but after that, it will only trigger on the printer related events.
Notifications very slow to arrive
I am doing a simple print through cups in python3 on a Raspberry Pi. I do a very simple setup
` # Create a new subscriber
self.printerName = 'DYMO-LabelWriter-450'
cups.setUser(self.printerName)
self.sub = Subscriber(self.conn)
# Subscribe the callback
self.sub.subscribe(self.my_callback)#, [event.CUPS_EVT_JOB_CREATED])
`
and then start the print job. The printer is a DYMO label printer.
self.printId = self.conn.printFile(self.printerName, self.printFile, "Label", options)
The printer is completely done before I get any events and then they progress events with percentages start coming. They are at least several minutes behind the completion of the printing. Each progress comes about 10 or more seconds apart.
Any suggestions how to get it to respond in real time with what the printer is doing?
Exception happened during processing of request
I got the following issue, any idea?
----------------------------------------
Exception happened during processing of request from ('127.0.0.1', 57540)
Traceback (most recent call last):
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socketserver.py", line 316, in _handle_request_noblock
self.process_request(request, client_address)
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socketserver.py", line 347, in process_request
self.finish_request(request, client_address)
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socketserver.py", line 360, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socketserver.py", line 720, in __init__
self.handle()
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/server.py", line 426, in handle
self.handle_one_request()
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/server.py", line 414, in handle_one_request
method()
File "/Users/Vincent/Documents/git/venv/pibooth/lib/python3.7/site-packages/cups_notify/listener.py", line 67, in do_PUT
evts.append(event.CupsEvent(data))
File "/Users/Vincent/Documents/git/venv/pibooth/lib/python3.7/site-packages/cups_notify/event.py", line 43, in __init__
self.timestamp = self._parse_date(data)
File "/Users/Vincent/Documents/git/venv/pibooth/lib/python3.7/site-packages/cups_notify/event.py", line 50, in _parse_date
return datetime.strptime(date, "%a, %d %b %Y %H:%M:%S GMT")
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/_strptime.py", line 577, in _strptime_datetime
tt, fraction, gmtoff_fraction = _strptime(data_string, format)
File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/_strptime.py", line 359, in _strptime
(data_string, format))
ValueError: time data 'Sun, 22 Mar 2020 15:43:32 GMT' does not match format '%a, %d %b %Y %H:%M:%S GMT'
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