Azure function logging with python library

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Azure function logging with python library

Yang Chowmun 411

I have a few function under one function app and I am doing some process flow logging using python standard library like
from logging.handlers import RotatingFileHandler

I saved the log files in the fileshare. I am expecting all the log files should contain only the function's log but i notice that the log generated by Function A is appear in log files for Function B. Similarly, log generated by Function B is appeared in Function A log files.

Is there any way for us to prevent this condition from happening or is there any setting we could use?

Thanks!

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Answer 1

Pramod Valavala 20,661 Microsoft Employee Moderator

@Yang Chowmun When initializing RotatingFileHandler, you would just have to pass in different file names for each function and use the right instance as required instead of using the same for all.

Also, by default, function logs will be sent to Azure Application Insights with additional properties like the Function name that you can use to query directly instead of dealing with files, unless you are specifically require file-based logging.

Yang Chowmun 411 Reputation points

2021-09-16T18:32:10.49+00:00

Hi @Pramod Valavala thanks for the reply. I am using RotatingFileHandler to save the log into different location but the log is still mixed up. Do you mind to clarify what you mean by 'right instance as required'?

Currently, I am using different logging python library like logzero and loguru to differentiate the log but it could only differentiate for functions?

Yea I do notice about the logging by application insight. I will require to extract some data for analysis from the log files. Btw do you have any reference for how to query from application insight? Thanks
Pramod Valavala 20,661 Reputation points Microsoft Employee Moderator

2021-09-22T06:49:44.537+00:00

@Yang Chowmun I mean to say that you could have separate instances of the logger object that writes to different files, one for each function.

With logzero for example, you could have custom instances for each function.

As for Application Insights, this official doc on analyzing azure functions telemetry in application insights should cover the details. For logs, you need to query the traces table.

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Azure function logging with python library

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