python-logging-rabbitmq

python-logging-rabbitmq

Logging handler to ships logs to RabbitMQ. Compatible with Django.

Installation

Install using pip.

pip install python_logging_rabbitmq

Versions

Version	Dependency
>= 2.x	Pika == 0.13
<= 1.1.1	Pika <= 0.10

Handlers

This package has two built-in handlers that you can import as follows:

from python_logging_rabbitmq import RabbitMQHandler

or (thanks to @wallezhang)

from python_logging_rabbitmq import RabbitMQHandlerOneWay

Handler	Description
RabbitMQHandler	Basic handler for sending logs to RabbitMQ. Every record will be delivered directly to RabbitMQ using the exchange configured.
RabbitMQHandlerOneWay	High throughput handler. Initializes an internal queue where logs are stored temporarily. A thread is used to deliver the logs to RabbitMQ using the exchange configured. Your app doesn't need to wait until the log is delivered. Notice that if the main thread dies you might lose logs.

Standalone python

To use with python first create a logger for your app, then create an instance of the handler and add it to the logger created.

import logging
from python_logging_rabbitmq import RabbitMQHandler

logger = logging.getLogger('myapp')
logger.setLevel(logging.DEBUG)

rabbit = RabbitMQHandler(host='localhost', port=5672)
logger.addHandler(rabbit)

logger.debug('test debug')

As result, a similar message as follows will be sent to RabbitMQ:

{
	"relativeCreated":280.61580657958984,
	"process":13105,
	"args":[],
	"module":"test",
	"funcName":"<module>",
	"host":"albertomr86-laptop",
	"exc_text":null,
	"name":"myapp",
	"thread":140032818181888,
	"created":1482290387.454017,
	"threadName":"MainThread",
	"msecs":454.01692390441895,
	"filename":"test.py",
	"levelno":10,
	"processName":"MainProcess",
	"pathname":"test.py",
	"lineno":11,
	"msg":"test debug",
	"exc_info":null,
	"levelname":"DEBUG"
}

Sending logs

By default, logs will be sent to RabbitMQ using the exchange 'log', this should be of type topic. The routing key used is formed by concatenating the logger name and the log level. For example:

import logging
from python_logging_rabbitmq import RabbitMQHandler

logger = logging.getLogger('myapp')
logger.setLevel(logging.DEBUG)
logger.addHandler(RabbitMQHandler(host='localhost', port=5672))

logger.info('test info')
logger.debug('test debug')
logger.warning('test warning')

The messages will be sent using the following routing keys:

• myapp.INFO
• myapp.DEBUG
• myapp.WARNING

For an explanation about topics and routing keys go to https://www.rabbitmq.com/tutorials/tutorial-five-python.html

When create the handler, you're able to specify different parameters in order to connect to RabbitMQ or configure the handler behavior.

Overriding routing-key creation

If you wish to override routing-key format entirely, you can pass routing_key_formatter function which takes LogRecord objects and returns routing-key. For example:

RabbitMQHandler(
	host='localhost',
	port=5672,
	routing_key_formatter=lambda r: (
		'some_exchange_prefix.{}'.format(r.levelname.lower())
	)
)

Configuration

These are the configuration allowed:

Parameter	Description	Default
host	RabbitMQ Server hostname or ip address.	localhost
port	RabbitMQ Server port.	5672
username	Username for authentication.	None
password	Provide a password for the username.	None
exchange	Name of the exchange to publish the logs. This exchange is considered of type topic.	log
declare_exchange	Whether or not to declare the exchange.	False
remove_request	If True (default), remove request & exc info.	True
routing_key_format	Customize how messages are routed to the queues.	{name}.{level}
routing_key_formatter	Customize how routing-key is constructed.	None
connection_params	Allow extra params to connect with RabbitMQ.	None
formatter	Use custom formatter for the logs.	python_logging_rabbitmq.JSONFormatter
close_after_emit	Close the active connection after send a log. A new connection is open for the next log.	False
fields	Dict to add as a field in each logs send to RabbitMQ. This is useful when you want fields in each log but without pass them every time.	None
fields_under_root	When is True, each key in parameter 'fields' will be added as an entry in the log, otherwise they will be logged under the key 'fields'.	True
message_headers	A dictionary of headers to be published with the message.	None
record_fields	A set of attributes that should be preserved from the record object.	None
exclude_record_fields	A set of attributes that should be ignored from the record object.	None
heartbeat	Lower bound for heartbeat timeout.	60
content_type	The format of the message sent to the queue.	text/plain

Examples

RabbitMQ Connection

rabbit = RabbitMQHandler(
	host='localhost',
	port=5672,
	username='guest',
	password='guest',
	connection_params={
		'virtual_host': '/',
		'connection_attempts': 3,
		'socket_timeout': 5000
	}
)

Custom fields

rabbit = RabbitMQHandler(
	host='localhost',
	port=5672,
	fields={
		'source': 'MyApp',
		'env': 'production'
	},
	fields_under_root=True
)

Custom formatter

By default, python_logging_rabbitmq implements a custom JSONFormatter; but if you prefer to format your own message you could do it as follow:

import logging
from python_logging_rabbitmq import RabbitMQHandler

FORMAT = '%(asctime)-15s %(message)s'
formatter = logging.Formatter(fmt=FORMAT)
rabbit = RabbitMQHandler(formatter=formatter)

For a custom JSON Formatter take a look at https://github.com/madzak/python-json-logger

Django

To use with Django add the handler in the logging config.

LOGGING = {
	'version': 1,
	'disable_existing_loggers': False,
	'handlers': {
		'rabbit': {
			'level': 'DEBUG',
			'class': 'python_logging_rabbitmq.RabbitMQHandler',
			'host': 'localhost'
		}
	},
	'loggers': {
		'myapp': {
			'handlers': ['rabbit'],
			'level': 'DEBUG',
			'propagate': False
		}
	}
}

Configuration

Same as when use it with standalone python, you could configure the handle directly when declaring it in the config:

LOGGING = {
	'version': 1,
	'disable_existing_loggers': False,
	'handlers': {
		'rabbit': {
			'level': 'DEBUG',
			'class': 'python_logging_rabbitmq.RabbitMQHandler',
			'host': 'localhost',
			'port': 5672,
			'username': 'guest',
			'password': 'guest',
			'exchange': 'log',
			'declare_exchange': False,
			'connection_params': {
				'virtual_host': '/',
				'connection_attempts': 3,
				'socket_timeout': 5000
			},
			'fields': {
				'source': 'MainAPI',
				'env': 'production'
			},
			'fields_under_root': True
		}
	},
	'loggers': {
		'myapp': {
			'handlers': ['rabbit'],
			'level': 'DEBUG',
			'propagate': False
		}
	}
}

Custom formatter

LOGGING = {
	'version': 1,
	'disable_existing_loggers': False,
	'formatters': {
		'standard': {
			'format': '%(levelname)-8s [%(asctime)s]: %(message)s'
		}
	},
	'handlers': {
		'rabbit': {
			'level': 'DEBUG',
			'class': 'python_logging_rabbitmq.RabbitMQHandler',
			'host': 'localhost',
			'formatter': 'standard'
		}
	},
	'loggers': {
		'myapp': {
			'handlers': ['rabbit'],
			'level': 'DEBUG',
			'propagate': False
		}
	}
}

JSON formatter

pip install python-json-logger

LOGGING = {
	'version': 1,
	'disable_existing_loggers': False,
	'formatters': {
		'json': {
			'()': 'pythonjsonlogger.jsonlogger.JsonFormatter',
			'fmt': '%(name)s %(levelname) %(asctime)s %(message)s'
		}
	},
	'handlers': {
		'rabbit': {
			'level': 'DEBUG',
			'class': 'python_logging_rabbitmq.RabbitMQHandler',
			'host': 'localhost',
			'formatter': 'json'
		}
	},
	'loggers': {
		'myapp': {
			'handlers': ['rabbit'],
			'level': 'DEBUG',
			'propagate': False
		}
	}
}

Releases

CHANGELOG

Similar efforts

• MQHandler (https://github.com/ziXiong/MQHandler)
• http://stackoverflow.com/a/25479008/2716524
• LogBook (http://pydoc.net/Python/Logbook/0.12.5/logbook.queues/)
• https://pypi.python.org/pypi/py-amqp-logging/0.1