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118 lines
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ReStructuredText
118 lines
3.7 KiB
ReStructuredText
Logger Component
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================
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.. seo::
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:description: Instructions for setting up the central logging component in esphomelib.
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:image: file-document-box.svg
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The logger component automatically logs all log messages through the
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serial port and through MQTT topics. By default, all logs with a
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severity higher than ``DEBUG`` will be shown. Decreasing the log level
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can help with the performance of the application and memory size.
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.. code:: yaml
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# Example configuration entry
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logger:
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level: DEBUG
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Configuration variables:
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------------------------
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- **baud_rate** (*Optional*, int): The baud rate to use for the serial
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UART port. Defaults to ``115200``. Set to ``0`` to disable logging via UART.
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- **tx_buffer_size** (*Optional*, string): The size of the buffer used
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for log messages. Decrease this if you’re having memory problems.
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Defaults to 512.
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- **level** (*Optional*, string): The global log level. Any log message
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with a lower severity will not be shown. Defaults to DEBUG.
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- **logs** (*Optional*, mapping): Manually set the log level for a
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specific component or tag. See :ref:`Manual Log Levels for more
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information <logger-manual_tag_specific_levels>`.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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.. _logger-log_levels:
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Log Levels
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----------
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Possible log levels are (sorted by severity):
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- ``NONE``
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- ``ERROR``
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- ``WARN``
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- ``INFO``
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- ``DEBUG``
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- ``VERBOSE``
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- ``VERY_VERBOSE``
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.. _logger-manual_tag_specific_levels:
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Manual Tag-Specific Log Levels
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------------------------------
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If some component is spamming the logs and you want to manually set the
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log level for it, first identify the tag of the log messages in question
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and then disable them in your configuration.
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Suppose we want to have verbose log messages globally, but the MQTT
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client spams too much. In the following example, we’d first see that the
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tag of the MQTT client is ``mqtt.client`` (before the first colon) and
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the tag for MQTT components is ``mqtt.component``.
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.. figure:: images/logger-manual_log_level.png
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Next, we can manually set the log levels in the configuration like this:
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.. code:: yaml
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logger:
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level: VERBOSE
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logs:
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mqtt.component: DEBUG
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mqtt.client: ERROR
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Please note that the global log level determines what log messages are
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saved in the binary. So for example a ``INFO`` global log message will
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purge all ``DEBUG`` log statements from the binary in order to conserve
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space. This however means that you cannot set tag-specific log levels
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that have a lower severity than the global log level.
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.. _logger-log_action:
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``logger.log`` Action
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---------------------
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Print a formatted message to the logs.
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In the ``format`` option, you can use ``printf``-style formatting (see :ref:`display-printf`).
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.. code:: yaml
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on_...:
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then:
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- logger.log: "Hello World"
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# Formatted:
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- logger.log:
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format: "The temperature sensor reports value %.1f and humidity %.1f"
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args: [ 'id(temperature_sensor).value', 'id(humidity_sensor).value' ]
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Configuration options:
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- **format** (**Required**, string): The format for the message in :ref:`printf-style <display-printf>`.
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- **args** (*Optional*, list of :ref:`lambda <config-lambda>`): The optional arguments for the
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format message.
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- **level** (*Optional*, string): The :ref:`log level <logger-log_levels>` to print the message
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with. Defaults to ``DEBUG``.
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- **tag** (*Optional*, string): The tag (seen in front of the message in the logs) to print the message
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with. Defaults to ``main``.
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See Also
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--------
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- :doc:`API Reference </api/core/log>`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/logger.rst>`__
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.. disqus::
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