ut-log 2.0.0.20251020

Utilities for Logging.

ut_log

Overview

Log Management

Installation

The package ut_log can be installed from PyPI.

To install with pip:

$ python -m pip install ut_log

Package logging

(c.f.: Appendix: Package Logging)

Package files

Classification

The Package ut_log consist of the following file types (c.f.: Appendix: Python Terminology):

1. Special files:

   1. py.typed

2. Special modules:

   1. __init__.py

   2. __version__.py

3. Modules

   1. log.py

4. Sub-packages

   1. cfg

      1. __init__.py

      2. log.std.yml

      3. log.usr.yml

Special Sub-directory: cfg

Overview

Special Sub directory cfg: Files

Name	Description
log.std.yml	Yaml definition file for standard logging
log.usr.yml	Yaml definition file for user logging

Modules

The Package ut_log contains the following modules.

ut_log Modules

Name	Decription
log.py	Logging management module

Module: log.py of Package: ut_log

The Module log contains the following static classes.

Classes of Module: log

Classes of Modul log

Name	Description
LogEq	Management of Log Equate message, generated from a key-, value-pair.
LogDic	Management of Log Equate messages, generated from the key-, value-pairs of a dictionary.
Log	Management of Log messages

Class: Log of Modul: log.py

The static Class Log contains the subsequent display- and management-methods.

Display Methods of Class: Log

Log Display Methods

Name	Description
debug	Log debug message to debug destination.
info	Log info message to info destination.
warning	Log warnning message to warning destination.
error	Log error message to error destination.
critcial	Log critical message to critical destination.

Management Methods of Class: Log

Log Management Methods

Name	Description
init	initialise current class.
sh_calendar_ts	Show timestamp or datetime.
sh_dir_run	Show run directory.
sh_d_dir_run	Show dictionary of run directories.
sh_d_log_cfg	Show log configuration directory.
sh_path_log_cfg	Show path of log configuration file.
sh	initialise and show current class.

Management Method: init of Class: Log

Parameter

Log method init: Parameter

Name	Type	Description
cls	class	current class
**kwargs	TyAny	keyword arguments

Class: LogEq of Modul: Log

The static Class LogEq of Module log.py contains the subsequent methods

Methods of Class LogEq

LogEq Methods

Name	Description
debug	Log generated equate message “<key> = <value>” to the debug destination.
info	Log generated equate message “<key> = <value>” to the info destination.
warning	Log generated equate message “<key> = <value>” to the warning destination.
error	Log generated equate message “<key> = <value>” to the error destination.
critcial	Log generated equate message “<key> = <value>” to the critical destination.

All Methods of Class: LogEq use the following Parameters:

Methods Parameter of Class: LogEq

LogEq Methods parameter

Name	Type	Description
cls	class	current class
key	TyAny	Key
value	TyAny	Value

Class: LogDic of Modul: log.py

The static Class LogDic of Module log.py contains the subsequent methods

Methods of Class: LogDic

LogDic Methods

Name	Description
debug	Log generated equate messages for all dictionary entries to the debug destination.
info	Log generated equate messages for all dictionary entries to the info destination.
warning	Log generated equate messages for all dictionary entries to the warning destination.
error	Log generated equate messages for all dictionary entries to the error destination.
critical	Log generated equate messages for all dictionary entries to the critical destination.

All Methods of Class LogDic use the following Parameters:

Method Parameters of Class: LogDic

LogDic Methods Parameter

Name	Type	Description
cls	class	current class
dic	TyDic	Dictionary

Appendix

Package Logging

Description

Logging use the module log.py of the logging package ut_log. The module supports two Logging types:

1. Standard Logging (std) or

2. User Logging (usr).

The Logging type can be defined by one of the values ‘std’ or ‘usr’ of the parameter log_type; ‘std’ is the default. The different Logging types are configured by one of the following configuration files:

1. log.std.yml or

2. log.usr.yml

The configuration files can be stored in different configuration directories (ordered by increased priority):

1. <package directory of the log package ut_log>/cfg,

2. <package directory of the application package ui_eviq_srr>/cfg,

3. <application directory of the application eviq>/cfg,

The active configuration file is the configuration file in the directory with the highest priority.

Examples

Site-packages-path = /appl/eviq/.pyenv/versions/3.11.12/lib/python3.11/site-packages Log-package = ut_log Application-package = ui_eviq_srr Application-home-path = /appl/eviq

Examples of log configuration-files

Log Configuration
Type	Directory Type	Directory	File
std	Log package	<Site-packages-path>/<Log-package>/cfg	log.std.yml
	Application package	<Site-packages-path>/<application-package>/cfg
	Application	<application-home-path>/cfg
usr	Log package	<site-packages-path>/ut_log/cfg	log.usr.yml
	Application package	<site-packages-path>/ui_eviq_srr/cfg
	Application	<application-path>/cfg

Log message types

Logging defines log file path names for the following log message types: .

1. debug

2. info

3. warning

4. error

5. critical

Log types and Log directories

Single or multiple Application log directories can be used for each message type:

Log types and directoriesg

Log type	Log directory
long	short	multiple	single
debug	dbqs	dbqs	logs
info	infs	infs	logs
warning	wrns	wrns	logs
error	errs	errs	logs
critical	crts	crts	logs

Application parameter for logging

Application parameter used in log naming

Name	Decription	Value	Description	Default	Example
appl_data	data directory				/data/eviq
tenant	tenant name	UMH			UMH
package	package name				ui_eviq_srr
cmd	command				evupreg
log_type	Logging Type	std:	Standard logging	std	std
		usr:	User Logging
log_ts_type	Logging timestamp type	ts:	Sec since 1.1.1970	ts	ts
		dt:	Datetime
log_sw_single_dir	Use single log directory	True	use single dir.	True	True
		False	use muliple dir.

Log files naming

Naming Conventions (table format)

Naming conventions for logging file paths

Type	Directory	File
debug	/<appl_data>/<tenant>/RUN/<package>/<cmd>/debs	debs_<ts>_<pid>.log
critical	/<appl_data>/<tenant>/RUN/<package>/<cmd>/logs	crts_<ts>_<pid>.log
error	/<appl_data>/<tenant>/RUN/<package>/<cmd>/logs	errs_<ts>_<pid>.log
info	/<appl_data>/<tenant>/RUN/<package>/<cmd>/logs	infs_<ts>_<pid>.log
warning	/<appl_data>/<tenant>/RUN/<package>/<cmd>/logs	rnsg_<ts>_<pid>.log

Naming Conventions (tree format)

<appl_data>   Application data folder
│
└── <tenant>  Application tenant folder
    │
    └── RUN  Applications RUN folder for Application log files
        │
        └── <package>  RUN folder of Application package: <package>
            │
            └── <cmd>  RUN folder of Application command <cmd>
                │
                ├── debs  Application command debug messages folder
                │   │
                │   └── debs_<ts>_<pid>.log  debug messages for
                │                            run of command <cmd>
                │                            with pid <pid> at <ts>
                │
                └── logs  Application command log messages folder
                    │
                    ├── crts_<ts>_<pid>.log  critical messages for
                    │                        run of command <cmd>
                    │                        with pid <pid> at <ts>
                    ├── errs_<ts>_<pid>.log  error messages for
                    │                        run of command <cmd>
                    │                        with pid <pid> at <ts>
                    ├── infs_<ts>_<pid>.log  info messages for
                    │                        run of command <cmd>
                    │                        with pid <pid> at <ts>
                    └── wrns_<ts>_<pid>.log  warning messages for
                                             run of command <cmd>
                                             with pid <pid> at <ts>

Naming Examples (table format)

Naming conventions for logging file paths

Type	Directory	File
debug	/appl/eviq/UMH/RUN/ui_eviq_srr/evdomap/debs/	debs_1750096540_354710.log
critical	/appl/eviq/UMH/RUN/ui_eviq_srr/evdomap/logs/	crts_1749971151_240257.log
error		errs_1749971151_240257.log
info		infs_1750096540_354710.log
warning		wrns_1749971151_240257.log

Naming Examples (tree format)

/data/eviq/UMH/RUN/ui_eviq_srr/evdomap  Run folder of
│                                       of function evdomap
│                                       of package ui_eviq_srr
│                                       for teanant UMH
│                                       of application eviq
│
├── debs  debug folder of Application function: evdomap
│   │
│   └── debs_1748609414_314062.log  debug messages for run
│                                   of function evdomap
│                                   using pid: 314062 at: 1748609414
│
└── logs  log folder of Application function: evdomap
    │
    ├── errs_1748609414_314062.log  error messages for run
    │                               of function evdomap
    │                               with pid: 314062 at: 1748609414
    ├── infs_1748609414_314062.log  info messages for run
    │                               of function evdomap
    │                               with pid: 314062 at: 1748609414
    └── wrns_1748609414_314062.log  warning messages for run
                                    of function evdomap
                                    with pid: 314062 at: 1748609414

Configuration files

log.std.yml (jinja2 yml file)

Content

version: 1

disable_existing_loggers: False

loggers:

    # standard logger
    std:
        # level: NOTSET
        level: DEBUG
        handlers:
            - std_debug_console
            - std_debug_file
            - std_info_file
            - std_warning_file
            - std_error_file
            - std_critical_file

handlers:

    std_debug_console:
        class: 'logging.StreamHandler'
        level: DEBUG
        formatter: std_debug
        stream: 'ext://sys.stderr'

    std_debug_file:
        class: 'logging.FileHandler'
        level: DEBUG
        formatter: std_debug
        filename: '{{dir_run_debs}}/debs_{{ts}}_{{pid}}.log'
        mode: 'a'
        delay: true

    std_info_file:
        class: 'logging.FileHandler'
        level: INFO
        formatter: std_info
        filename: '{{dir_run_infs}}/infs_{{ts}}_{{pid}}.log'
        mode: 'a'
        delay: true

    std_warning_file:
        class: 'logging.FileHandler'
        level: WARNING
        formatter: std_warning
        filename: '{{dir_run_wrns}}/wrns_{{ts}}_{{pid}}.log'
        mode: 'a'
        delay: true

    std_error_file:
        class: 'logging.FileHandler'
        level: ERROR
        formatter: std_error
        filename: '{{dir_run_errs}}/errs_{{ts}}_{{pid}}.log'
        mode: 'a'
        delay: true

    std_critical_file:
        class: 'logging.FileHandler'
        level: CRITICAL
        formatter: std_critical
        filename: '{{dir_run_crts}}/crts_{{ts}}_{{pid}}.log'
        mode: 'a'
        delay: true

    std_critical_mail:
        class: 'logging.handlers.SMTPHandler'
        level: CRITICAL
        formatter: std_critical_mail
        mailhost : localhost
        fromaddr: '[e-mail]'
        toaddrs:
            - '[e-mail]'
            - '[e-mail]'
        subject: 'Critical error with application name'

formatters:

    std_debug:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'
    std_info:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'
    std_warning:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'
    std_error:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'
    std_critical:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'
    std_critical_mail:
        format: '%(asctime)-15s %(levelname)s-%(name)s-%(process)d::%(module)s.%(funcName)s|%(lineno)s:: %(message)s'
        datefmt: '%Y-%m-%d %H:%M:%S'

Jinja2-variables

log.std.yml Jinja2 variables

Name	Definition	Example
dir_run_debs	debug run directory	/data/eviq/UMH/RUN/ui_eviq_srr/evupreg/debs
dir_run_infs	info run directory	/data/eviq/UMH/RUN/ui_eviq_srr/evupreg/logs
dir_run_wrns	warning run directory
dir_run_errs	error run directory
dir_run_crts	critical error run directory
ts	Timestamp since 1970 in [sec] if log_ts_type == ‘ts’	1749483509
	Datetime in timezone Europe/ Berlin if log_ts_type == ‘dt’	20250609 17:38:29 GMT+0200
pid	Process ID	79133

Python Glossary

Python Modules

Overview

Python Modules

Name	Definition
Python modules	Files with suffix .py; they could be empty or contain python code; other modules can be imported into a module.
special Python modules	Modules like __init__.py or main.py with special names and functionality.

Python Function

Overview

Python Function

Name	Definition
Python function	Files with suffix .py; they could be empty or contain python code; other modules can be imported into a module.
special Python modules	Modules like __init__.py or main.py with special names and functionality.

Python Packages

Overview

Python Packages Overview

Name	Definition
Python package	Python packages are directories that contains the special module __init__.py and other modules, sub packages, files or directories.
Python sub-package	Python sub-packages are python packages which are contained in another python package.
Python package sub-directory	directory contained in a python package.
Python package special sub-directory	Python package sub-directories with a special meaning like data or cfg

Special python package sub-directories

Special python package sub-directories

Name	Description
bin	Directory for package scripts.
cfg	Directory for package configuration files.
data	Directory for package data files.
service	Directory for systemd service scripts.

Python Files

Overview

Python files

Name	Definition
Python modules	Files with suffix .py; they could be empty or contain python code; other modules can be imported into a module.
Python package files	Files within a python package.
Python dunder modules	Python modules which are named with leading and trailing double underscores.
special Python files	Files which are not modules and used as python marker files like py.typed.
special Python modules	Modules like __init__.py or main.py with special names and functionality.

Python Special Files

Python special files

Name	Type	Description
py.typed	Type checking marker file	The py.typed file is a marker file used in Python packages to indicate that the package supports type checking. This is a part of the PEP 561 standard, which provides a standardized way to package and distribute type information in Python.

Python Special Modules

Python special modules

Name	Type	Description
__init__.py	Package directory marker file	The dunder (double underscore) module __init__.py is used to execute initialisation code or mark the directory it contains as a package. The Module enforces explicit imports and thus clear namespace use and call them with the dot notation.
__main__.py	entry point for the package	The dunder module __main__.py serves as package entry point point. The module is executed when the package is called by the interpreter with the command python -m <package name>.
__version__.py	Version file	The dunder module __version__.py consist of assignment statements used in Versioning.

Python classes

Overview

Python classes overview

Name	Description
Python class	A class is a container to group related methods and variables together, even if no objects are created. This helps in organizing code logically.
Python static class	A class which contains only @staticmethod or @classmethod methods and no instance-specific attributes or methods.

Python methods

Overview

Python methods overview

Name	Description
Python method	Python functions defined in python modules.
Python class method	Python functions defined in python classes.
Python special class method	Python class methods with special names and functionalities.

Python class methods

Python class methods

Name	Description
Python no instance class method	Python function defined in python classes and decorated with @classmethod or @staticmethod. The first parameter conventionally called cls is a reference to the current class.
Python instance class method	Python function defined in python classes; the first parameter conventionally called self is a reference to the current class object.
special Python class method	Python class functions with special names and functionalities.

Python special class methods

Python methods examples

Name	Type	Description
__init__	class object constructor method	The special method __init__ is called when an instance (object) of a class is created; instance attributes can be defined and initalized in the method. The method us a single parameter conventionally called self to access the object.

Table of Contents

Table of Content

• ut_log

  • Overview

  • Installation

  • Package logging

  • Package files

    • Classification

    • Special Sub-directory: cfg

    • Modules

    • Module: log.py of Package: ut_log

      • Classes of Module: log

      • Class: Log of Modul: log.py

        • Display Methods of Class: Log

        • Management Methods of Class: Log

        • Management Method: init of Class: Log

      • Class: LogEq of Modul: Log

        • Methods of Class LogEq

          • Methods Parameter of Class: LogEq

      • Class: LogDic of Modul: log.py

        • Methods of Class: LogDic

          • Method Parameters of Class: LogDic

• Appendix

  • Package Logging

    • Description

    • Examples

    • Log message types

      • Log types and Log directories

      • Application parameter for logging

      • Log files naming

        • Naming Conventions (table format)

        • Naming Conventions (tree format)

        • Naming Examples (table format)

        • Naming Examples (tree format)

    • Configuration files

      • Content

      • Jinja2-variables

  • Python Glossary

    • Python Modules

    • Python Function

    • Python Packages

      • Overview

      • Special python package sub-directories

    • Python Files

      • Overview

      • Python Special Files

      • Python Special Modules

    • Python classes

    • Python methods

      • Overview

      • Python class methods

      • Python special class methods

• Table of Contents