atckit 1.7.7

AccidentallyTheCables Utility Kit

ATCKit

AccidentallyTheCable's Utility Kit

• ATCKit
  • About
    • How does it work?
  • Usage
    • FunctionSubscriber
  • UtilFuncs
    • create_object_logger
    • create_static_logger
    • deltatime_str
    • dump_sstr
    • load_sstr
    • load_sfile
    • scan_dir
    • deep_sort
    • check_pid
    • register_pid
    • register_signals
    • find_config_file
    • add_config_search_path
    • remove_config_search_path
    • add_config_search_file_ext
    • remove_config_search_file_ext
  • Service
  • Version
    • Version Search Strings
      • version_locator
      • version_search_merge

About

This is a small kit of classes, util functions, etc that I found myself rewriting or reusing frequently, and instead of copying everywhere, they are now here.

How does it work?

Do the needfuls.... do the needful dance

Literally, import whatever you need to use..

Usage

FunctionSubscriber

A Class container for Function callback subscription via += or -=. Functions can be retrieved in order of addition.

subscriber = FunctionSubscriber()

def a():
    print("I am a teapot")

def b():
    print("I am definitely totally not also a teapot, I swear")

subscriber += a
subscriber += b

for cb in subscriber.functions:
    cb()

>> I am a teapot
>> I am definitely totally not also a teapot, I swear

This class uses the typing.Callable type for function storage. You can extend the FunctionSubscriber class to define the callback function parameters, etc.

class MySubscriber(FunctionSubscriber):
    """My Function Subscriber
    Callback: (bool) -> None
    """

    _functions:list[Callable[[bool],None]]

    def __iadd__(self,fn:Callable[[bool],None]) -> Self:
        """Inline Add. Subscribe Function
        @param method \c fn Method to Subscribe
        """
        return super().__iadd__(fn)

    def __isub__(self,fn:Callable[[bool],None]) -> Self:
        """Inline Subtract. Unsubscribe Function
        @param method \c fn Method to Unsubscribe
        """
        return super().__isub__(fn)

UtilFuncs

A Class containing various static methods:

create_object_logger

Create logging.Logger instance for object specifically

create_static_logger

Create logging.Logger instance of a specified name

deltatime_str

Create datetime.timedelta from short formatted time string. Format: 0Y0M0w0d0h0m0s0ms

dump_sstr

Dump Structured Data (dict) to str of specified format. Accepts JSON, YAML, TOML

load_sstr

Load Structured Data from String. Accepts JSON, YAML, TOML

load_sfile

Load Structured Data from File, automatically determining data by file extension. Accepts JSON, YAML, TOML

scan_dir

Search a specified Path, and execute a callback function on discovered files.

• Allows exclusion of Files/Dirs via regex pattern matching

deep_sort

Sort a Dictionary recursively, including through lists of dicts

check_pid

Check if a process ID exists (via kill 0)

register_pid

Register (Write) process ID in specified directory as <service>.pid

register_signals

Register Shutdown / Restart Handlers

• Check for Shutdown via UtilFuncs.shutdown (bool)
• Check for Restart via UtilFuncs.restart (bool)

find_config_file

Look for config file in 'well defined' paths. Searches for <service>/<config>.[toml,json,yaml] in ~/.local/ and /etc/ (in that order)

add_config_search_path

Add Search Path for find_config_file

remove_config_search_path

Remove Search Path for find_config_file

add_config_search_file_ext

Add file extension for find_config_file

remove_config_search_file_ext

Remove file extension for find_config_file

Service

A Service / Daemon Class. Responds to signals properly, including HUP to restart threads

HUP does not restart main thread. So if the main configuration file needs to be re-read, the service needs to be stopped and started completely.

Entrypoint functions for services are defined under the .services FunctionSubscriber. These functions should be loopable, or be capable of starting again each time the function completes.

Create a class, which extends Service, such as MyService.

• Set Service Name: MyService._SERVICE_NAME = "myservice"
• Set Shutdown Time Limit: MyService._SERVICE_SHUTDOWN_LIMIT = 300 (default shown)
• Set Thread Check Interval: MyService._SERVICE_CHECK_TIME = 0.5 (default shown)
• Configuration Loading: Utilizes UtilFuncs.find_config_file() and UtilFuncs.load_sfile(), will attempt to load <service_name>/<service_name>.[toml,yaml,json] from 'well known' paths, configuaration available in MyService._config. Additional locations can be added with UtilFuncs.add_config_search_path()
• Subscribe / Create Thread: MyService.services += <function>
• Unsubscribe / Remove Thread: MyService.services -= <function>
• Shutdown: Set MyService.shutdown (bool), Utilizes Utilfuncs.shutdown
• Restart: Set MyService.restart (bool), Utilizes Utilfuncs.restart
• Run Check: Check MyService.should_run to see if thread needs to stop
• Run: Call MyService.run()
• Stop: Call MyService.stop()
• Signal Handlers: Utilizes Utilfuncs.register_signals()
• Process ID storage: Set pid_dir in Configuration File

Example Service Functions:

import logging
from time import sleep

from atckit.service import Service

class MyService(Service):
    def __init__(self) -> None:
        super().__init__()
        self.services += self._testloopA # Add Thread to Service
        self.services += self._testloopB # Add another Thread

    def _testloopA(self) -> None:
        """Test Function, Continuous loop
        @retval None Nothing
        """
        while self.should_run:
            self.logger.info("Loop test")
            sleep(1)

    def _testloopB(self) -> None:
        """Test Function, One Shot, restarting at minimum every `MyService._SERVICE_CHECK_TIME` seconds
        @retval None Nothing
        """
        self.logger.info("Test Looop")
        sleep(1)

if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG) # Logging Configuration
    service:MyService = MyService() # Initialize Service
    service.run() # Stop with ABRT/INT/TERM CTRL+C
    service.stop() # Cleanup / Wait for Shutdown

Version

A Class for version manipulation.

A Version can be created from:

• Semantic String ("1.0.0")
• List of Strings or Ints of a version (["1","0","0"] or [1,0,0])
• Tuple of Strings or Ints of a version (("1","0","0") or (1,0,0))

Versions are comparable (>,<,>=,<=,==,!=) Versions are addable and subtractable (a -= b, a += b)

• During subtraction, if a part goes negative, it will be set to 0

Version Search Strings

To make Version things even easier, 2 functions are also included in the Version module, which enables a list of matching versions to be created, from the search.

Version Search Strings are 1 or more entries in a specially formatted string: <comparator>:<version>,...

Supported comparators: >,<,>=,<=,==,!=

Example Searches:

• ">=:1.0.0,!=:2.0.2,<=:4.0.0"
• "<=:3.0.0,>:0.9.0"

version_locator

Given a list of versions, locate a version which matches a given search string.

• Example 1 matching:
  • Any Version Newer than 1.0.0, including 1.0.0
  • Not Version 2.0.2
  • Any Version Older than 4.0.0, including 4.0.0
• Example 2 matching:
  • Any Version Older than 3.0.0, including 3.0.0
  • Any Version Newer than 0.9.0, not including 0.9.0

version_search_merge

Combine 2 Version Search Strings, creating a single string, which satisfies all searches in each string.

Given the examples above, merging these two searches, would result in the following compatible search: >=:1.0.0,<=:3.0.0,!=:2.0.2