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==================
Logging/Monitoring
==================
It is possible to use `pymongo.monitoring <https://pymongo.readthedocs.io/en/stable/api/pymongo/monitoring.html>`_ to monitor
the driver events (e.g: queries, connections, etc). This can be handy if you want to monitor the queries issued by
MongoEngine to the driver.
To use `pymongo.monitoring` with MongoEngine, you need to make sure that you are registering the listeners
**before** establishing the database connection (i.e calling `connect`):
The following snippet provides a basic logging of all command events:
.. code-block:: python
import logging
from pymongo import monitoring
from mongoengine import *
log = logging.getLogger()
log.setLevel(logging.DEBUG)
logging.basicConfig(level=logging.DEBUG)
class CommandLogger(monitoring.CommandListener):
def started(self, event):
log.debug("Command {0.command_name} with request id "
"{0.request_id} started on server "
"{0.connection_id}".format(event))
def succeeded(self, event):
log.debug("Command {0.command_name} with request id "
"{0.request_id} on server {0.connection_id} "
"succeeded in {0.duration_micros} "
"microseconds".format(event))
def failed(self, event):
log.debug("Command {0.command_name} with request id "
"{0.request_id} on server {0.connection_id} "
"failed in {0.duration_micros} "
"microseconds".format(event))
monitoring.register(CommandLogger())
class Jedi(Document):
name = StringField()
connect()
log.info('GO!')
log.info('Saving an item through MongoEngine...')
Jedi(name='Obi-Wan Kenobii').save()
log.info('Querying through MongoEngine...')
obiwan = Jedi.objects.first()
log.info('Updating through MongoEngine...')
obiwan.name = 'Obi-Wan Kenobi'
obiwan.save()
Executing this prints the following output::
INFO:root:GO!
INFO:root:Saving an item through MongoEngine...
DEBUG:root:Command insert with request id 1681692777 started on server ('localhost', 27017)
DEBUG:root:Command insert with request id 1681692777 on server ('localhost', 27017) succeeded in 562 microseconds
INFO:root:Querying through MongoEngine...
DEBUG:root:Command find with request id 1714636915 started on server ('localhost', 27017)
DEBUG:root:Command find with request id 1714636915 on server ('localhost', 27017) succeeded in 341 microseconds
INFO:root:Updating through MongoEngine...
DEBUG:root:Command update with request id 1957747793 started on server ('localhost', 27017)
DEBUG:root:Command update with request id 1957747793 on server ('localhost', 27017) succeeded in 455 microseconds
More details can of course be obtained by checking the `event` argument from the `CommandListener`.
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