ca-vntl-helper 1.1.2

Some useful functions, classes to help work. Create by Van of Techlab CA team.

CA VNTL Helper

This is a simple helper for the CA Techlab project. It is designed to help you track errors and do some actions when errors occur. It will help you to track, log, and alert when an error occurs in your code. It can show the parameters you passed, so you can easily simulate the error.

Installation

Install the package using pip:

pip install ca-vntl-helper

Usage

The decorator function

Import the decorator function from the package and use it to decorate your function. The message will be through when an error occurs.

from ca_vntl_helper import error_tracking_decorator

@error_tracking_decorator
def example_function():
    # Your code here
    pass

Example

Some nested functions and an error will be raised in the innermost function. The error message will be printed out.

You just place the decorator on the top of the function you want to track.

from ca_vntl_helper import error_tracking_decorator

def divide(a, b):
    return a / b

def second_inner_function(second_inner_a, second_inner_b):
    return divide(second_inner_a, second_inner_b)
    
def first_inner_function(first_inner_a, first_inner_b):
    return second_inner_function(first_inner_a, first_inner_b)

@error_tracking_decorator # Just place the decorator here
def outer_function(outer_a, outer_b):
    return first_inner_function(outer_a, outer_b)

if __name__ == "__main__":
    # The process will get an error when dividing by 0
    outer_function(1, 0)

ERROR:root:Error in function outer_function 
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: outer_function, params: {'outer_a': 1, 'outer_b': 0}
	-----
	Line: 20,     return first_inner_function(outer_a, outer_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: first_inner_function, params: {'first_inner_a': 1, 'first_inner_b': 0}
	-----
	Line: 15,     return second_inner_function(first_inner_a, first_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: second_inner_function, params: {'second_inner_a': 1, 'second_inner_b': 0}
	-----
	Line: 11,     return divide(second_inner_a, second_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: divide, params: {'a': 1, 'b': 0}
	-----
	Line: 7,     return a / b
 	-->ROOT CAUSE: ZeroDivisionError: division by zero 
	-----

As you can see, the error message is printed out with the function name, parameters, the filename, and the line number. The root cause of the error is also shown.

The class with callback functions

In case you want to do some actions like alert to Slack or save error logs to S3, you can use the class with callback functions.

from ca_vntl_helper import ErrorTrackerWithCallBacks

# Define your callback functions, notice that those functions must have a parameter to receive the message
def send_message_to_slack(message):
    # Your code here
    print("Message sent to slack:")
    print(message)
    
def save_message_to_logfile_on_s3(message):
    # Your code here
    print("Message saved to logfile on S3:")
    print(message)

error_tracker = ErrorTrackerWithCallBacks(callback_functions=[send_message_to_slack, save_message_to_logfile_on_s3])
error_tracking_decorator_with_callbacks = error_tracker.error_tracking_decorator

def divide(a, b):
    return a / b

def second_inner_function(second_inner_a, second_inner_b):
    return divide(second_inner_a, second_inner_b)

def first_inner_function(first_inner_a, first_inner_b):
    return second_inner_function(first_inner_a, first_inner_b)

@error_tracking_decorator_with_callbacks  # Just place the decorator here
def outer_function(outer_a, outer_b):
    return first_inner_function(outer_a, outer_b)

if __name__ == "__main__":
    # The process will get an error when dividing by 0
    outer_function(1, 0)

Message sent to slack:
Error in function outer_function 
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: outer_function, params: {'outer_a': 1, 'outer_b': 0}
	-----
	Line: 28,     return first_inner_function(outer_a, outer_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: first_inner_function, params: {'first_inner_a': 1, 'first_inner_b': 0}
	-----
	Line: 23,     return second_inner_function(first_inner_a, first_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: second_inner_function, params: {'second_inner_a': 1, 'second_inner_b': 0}
	-----
	Line: 19,     return divide(second_inner_a, second_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: divide, params: {'a': 1, 'b': 0}
	-----
	Line: 15,     return a / b
 	-->ROOT CAUSE: ZeroDivisionError: division by zero 
	-----

Message saved to logfile on S3:
Error in function outer_function 
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: outer_function, params: {'outer_a': 1, 'outer_b': 0}
	-----
	Line: 28,     return first_inner_function(outer_a, outer_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: first_inner_function, params: {'first_inner_a': 1, 'first_inner_b': 0}
	-----
	Line: 23,     return second_inner_function(first_inner_a, first_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: second_inner_function, params: {'second_inner_a': 1, 'second_inner_b': 0}
	-----
	Line: 19,     return divide(second_inner_a, second_inner_b)
 	-----
===================================================
Filename: /Users/abc/Documents/projects/packaging_helper/src/test.py,
Function name: divide, params: {'a': 1, 'b': 0}
	-----
	Line: 15,     return a / b
 	-->ROOT CAUSE: ZeroDivisionError: division by zero 
	-----