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Python custom sensor incorrect output

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I'm trying to use a custom Python script to count some files in a directory. In the code, I use this to count said files

file_count = sum((len(f) for _, _, f in os.walk("Q:\some\location")))

Testing with the included Python build works great, I am able to get an accurate count. However, when PRTG runs the script, the output is always wrong (always at 0 files, no matter how many are there). Even when I put out the log, the output was still wrong in the log. Then, to make absolutely sure, I copied-pasted the line in the log labeled Command Line: into Powershell, and got the correct response. Somehow, only when PRTG runs it, I get the wrong values. The full script is located below:

import sys
import json
import os
# get CustomSensorResult from paepy package
from paepy.ChannelDefinition import CustomSensorResult

if __name__ == "__main__":

    # start by counting the number of files in the directory
    file_count = sum((len(f) for _, _, f in os.walk("Q:\somewhere\over\there")))

    if file_count == 0:
        result = CustomSensorResult("No error logs found")
    else:
        result = CustomSensorResult("One or more error logs detected")

    result.add_channel(channel_name="Connection Errors", is_limit_mode=True, limit_max_error=10, unit="Percent", value=file_count, is_float=False, primary_channel=True)
    print(result.get_json_result())

prtg python-script-advanced-sensor python3-6-1

Created on Jun 28, 2018 10:18:53 PM by  EvanSteeleOSU (50) 2 1



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Got it! I changed the share path from an assigned drive letter to an absolute path:

file_count = sum((len(f) for _, _, f in os.walk("Q:\somewhere\over\there")))

became

file_count = sum((len(f) for _, _, f in os.walk("\\\\theshare.somewhere.com\somewhere\over\there")))

and it now works on all fronts.

Created on Jun 29, 2018 8:04:47 PM by  EvanSteeleOSU (50) 2 1



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Dear EvanSteeleOSU,

please change the security context to the context of the device, and make sure you enter proper Windows credentials in the device's settings tab. Do you now get a non-zero result?

Created on Jun 29, 2018 12:29:53 PM by  Arne Seifert [Paessler Support]



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No luck there, it still gives a zero result. For context, here's what the command line looks like when I run it manually: PS C:\Users\SHS_steelee> & "C:\Program Files (x86)\PRTG Network Monitor\Python34\python.exe" "C:\Program Files (x86)\PRTG Network Monitor\custom sensors\python\service_sensor.py {"prtg": {"text": "Connection Errors Detected", "result": [{"Channel": "Connection Errors", "LimitMode": 1, "Value": 28, "LimitMaxError": 10, "Unit": "Percent"}]} This is the correct output. The sensor log has this as the command it runs:

Command Line: "C:\Program Files (x86)\PRTG Network Monitor\Python34\python.exe" -E "C:\Program Files (x86)\PRTG Network Monitor\custom sensors\python\service_sensor.py" "{\"blockedsens\":\"\",\"canlinux\":\"0\",\"fastcount\":\"0\",\"host\":\"thehost.somewhere.com\",\"hostv6\":\"\",\"interfacenumber\":\"\",\"inum\":\"\",\"ipversion\":\"0\",\"isexesensor\":\"0\",\"lastuptime\":\"0\",\"mutexname\":\"\",\"notonpod\":\"0\",\"params\":\"\",\"pythonscript\":\"service_sensor.py\",\"reboot\":\"43278.9046695023\",\"reqmsginterval\":\"300\",\"sensorid\":\"2779\",\"simulate\":\"0\",\"timeout\":\"299\",\"tlsexplicit_default\":\"\",\"tlsexplicit_ftp\":\"\",\"tlsexplicit_imap\":\"\",\"tlsexplicit_pop3\":\"\",\"tlsexplicit_port\":\"\",\"tlsexplicit_smtp\":\"\",\"uptimecount\":\"0\",\"usednstime\":\"0\",\"usewindowsauthentication\":\"1\",\"windowslogindomain\":\"myDomain\",\"windowsloginpassword\":********,\"windowsloginusername\":\"myusername\",\"writeresult\":\"1\"}"

Again, running this manually gets the correct answer too:

{"prtg": {"text": "Connection Errors Detected", "result": [{"Channel": "Connection Errors", "Unit": "Percent", "LimitMode": 1, "Value": 28, "LimitMaxError": 10}]}}

However, the output in the logs is still wrong:

Script Output (UTF8 Encoding): {"prtg": {"text": "No service connection errors detected", "result": [{"LimitMaxError": 10, "Value": 0, "Channel": "Connection Errors", "Unit": "Percent", "LimitMode": 1}]}}[CR][LF]

I have tried adding the suggested security context and the proper Windows credentials to no effect.

Edit: Just in case this is relevant, the location that the script is monitoring is a network share.

Created on Jun 29, 2018 7:33:39 PM by  EvanSteeleOSU (50) 2 1

Last change on Jun 29, 2018 8:01:02 PM by  Luciano Lingnau [Paessler Support]



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Got it! I changed the share path from an assigned drive letter to an absolute path:

file_count = sum((len(f) for _, _, f in os.walk("Q:\somewhere\over\there")))

became

file_count = sum((len(f) for _, _, f in os.walk("\\\\theshare.somewhere.com\somewhere\over\there")))

and it now works on all fronts.

Created on Jun 29, 2018 8:04:47 PM by  EvanSteeleOSU (50) 2 1



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Dear EvanSteeleOSU,

thank you for sharing the solution of this case.

Created on Jun 29, 2018 8:22:40 PM by  Arne Seifert [Paessler Support]



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