docs/mdclogger.rst

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.. Copyright (c) 2019 AT&T Intellectual Property.
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.. Copyright (c) 2019 Nokia.
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.. Copyright (c) 2021 Samsung
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.. Licensed under the Creative Commons Attribution 4.0 International
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.. Public License (the "License"); you may not use this file except
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..     https://creativecommons.org/licenses/by/4.0/
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.. Unless required by applicable law or agreed to in writing, documentation
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.. distributed under the License is distributed on an "AS IS" BASIS,
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.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.. See the License for the specific language governing permissions and
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.. This source code is part of the near-RT RIC (RAN Intelligent Controller)
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.. platform project (RICP).
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MDCLogger
=========


Usage
-----

The library can be used in as shown below.


.. code:: bash

 ```python
   from ricappframe.logger.mdclogger import MDCLogger
   my_logger = MDCLogger()
   my_logger.mdclog_format_init(configmap_monitor=True)
   my_logger.error("This is an error log")
 ```

A program can create several logger instances.

mdclog_format_init() Adds the MDC log format with HostName, PodName, ContainerName, ServiceName,PID,CallbackNotifyforLogFieldChange

Pass configmap_monitor = False in mdclog_format_init() function to stop dynamic log level change based on configmap.

Logging Levels
--------------
.. code:: bash

 """Severity levels of the log messages."""
     DEBUG = 10
     INFO = 20
     WARNING = 30
     ERROR = 40

mdcLogger API's
---------------

1. Set current logging level

.. code:: bash

 def set_level(self, level: Level):

        Keyword arguments:
        level -- logging level. Log messages with lower severity will be filtered.

2. Return the current logging level

.. code:: bash

 def get_level(self) -> Level:

3. Add a logger specific MDC

.. code:: bash

 def add_mdc(self, key: str, value: Value):

        Keyword arguments:
        key -- MDC key
        value -- MDC value

4. Return logger's MDC value with the given key or None

.. code:: bash

 def get_mdc(self, key: str) -> Value:

5. Remove logger's MDC with the given key

.. code:: bash

 def remove_mdc(self, key: str):

6. Remove all MDCs of the logger instance.

.. code:: bash

 def clean_mdc(self):


7. Initialise Logging format: 

This api Initialzes mdclog print format using MDC Dictionary by extracting the environment variables in the calling process for “SYSTEM_NAME”, “HOST_NAME”, “SERVICE_NAME”, “CONTAINER_NAME”, “POD_NAME” & “CONFIG_MAP_NAME” mapped to HostName, ServiceName, ContainerName, Podname and Configuration-file-name of the services respectively.


.. code:: bash

 def mdclog_format_init(configmap_monitor=False):

        Keyword arguments:
        configmap_monitor -- Enables/Disables Dynamic log level change based on configmap
                          -- Boolean values True/False can be passed as per requirement.