Logger section

First we need to set up a logger for testing:

>>> import logging, sys
>>> logger = logging.getLogger()
>>> handler = logging.StreamHandler(sys.stdout)
>>> handler.setFormatter(logging.Formatter('%(name)s: %(message)s'))
>>> logger.addHandler(handler)

A logger section lets you log a piece of data from the item together with a name. You can set any logging level in the logger. The logger blueprint name is collective.transmogrifier.sections.logger.

>>> infologger = """
... [transmogrifier]
... pipeline =
...     source
...     logger
...
... [source]
... blueprint = collective.transmogrifier.sections.tests.rangesource
... size = 3
...
... [logger]
... blueprint = collective.transmogrifier.sections.logger
... level = INFO
... name = Infologger test
... key = id
... """
>>> registerConfig('collective.transmogrifier.sections.tests.infologger',
...                infologger)
>>> transmogrifier('collective.transmogrifier.sections.tests.infologger')
Infologger test: item-00
Infologger test: item-01
Infologger test: item-02

We can also have numerical levels, and if the key is missing, it will print out a message to that effect. A condition may also be used to restrict the items logged.

>>> debuglogger = """
... [transmogrifier]
... pipeline =
...     source
...     logger
...
... [source]
... blueprint = collective.transmogrifier.sections.tests.rangesource
... size = 3
...
... [logger]
... blueprint = collective.transmogrifier.sections.logger
... level = 10
... name = Infologger test
... key = foo
... condition = python:item['id'] != 'item-01'
... """
>>> registerConfig('collective.transmogrifier.sections.tests.debuglogger',
...                debuglogger)
>>> transmogrifier('collective.transmogrifier.sections.tests.debuglogger')
Infologger test: -- Missing key --
Infologger test: -- Missing key --

If no key option is given, the logger will render the whole item in a readable format using Python’s pprint module. The delete option can be used to omit certain keys from the output, such as body text fields which may be too large and make the output too noisy.

>>> logger = """
... [transmogrifier]
... pipeline =
...     source
...     logger
...
... [source]
... blueprint = collective.transmogrifier.sections.tests.samplesource
...
... [logger]
... blueprint = collective.transmogrifier.sections.logger
... level = INFO
... delete =
...     title-duplicate
...     id-duplicate
...     nonexistent
... """
>>> registerConfig('collective.transmogrifier.sections.tests.logger',
...                logger)
>>> transmogrifier('collective.transmogrifier.sections.tests.logger')
collective.transmogrifier.sections.tests.logger.logger:
  {'id': 'foo', 'status': '℗', 'title': 'The Foo Fighters ℗'}
collective.transmogrifier.sections.tests.logger.logger:
  {'id': 'bar', 'status': '™', 'title': 'Brand Chocolate Bar ™'}
collective.transmogrifier.sections.tests.logger.logger:
  {'id': 'monty-python', 'status': '©', 'title': "Monty Python's Flying Circus ©"}