python-logstash

Python logging handler for Logstash.

https://www.elastic.co/products/logstash

Notes:

This is a copy of python-logstash: https://pypi.python.org/pypi/python-logstash That has been update to work with python 3.

Installation

Using pip: pip install python3-logstash

Usage

LogstashHandler is a custom logging handler which sends Logstash messages using UDP, or TCP.

For example:

import logging
import logstash
import sys

host = 'localhost'

test_logger = logging.getLogger('python-logstash-logger')
test_logger.setLevel(logging.INFO)
test_logger.addHandler(logstash.LogstashHandler(host, 5959, version=1))
# test_logger.addHandler(logstash.TCPLogstashHandler(host, 5959, version=1))

test_logger.error('python-logstash: test logstash error message.')
test_logger.info('python-logstash: test logstash info message.')
test_logger.warning('python-logstash: test logstash warning message.')

# add extra field to logstash message
extra = {
    'test_string': 'python version: ' + repr(sys.version_info),
    'test_boolean': True,
    'test_dict': {'a': 1, 'b': 'c'},
    'test_float': 1.23,
    'test_integer': 123,
    'test_list': [1, 2, '3'],
}
test_logger.info('python-logstash: test extra fields', extra=extra)

When using extra field make sure you don't use reserved names. From Python documentation <https://docs.python.org/2/library/logging.html>. | "The keys in the dictionary passed in extra should not clash with the keys used by the logging system. (See the Formatter <https://docs.python.org/2/library/logging.html#logging.Formatter> documentation for more information on which keys are used by the logging system.)"

To use the AMQPLogstashHandler you will need to install pika first.

   pip install pika

For example::

  import logging
  import logstash

  test_logger = logging.getLogger('python-logstash-logger')
  test_logger.setLevel(logging.INFO)
  test_logger.addHandler(logstash.AMQPLogstashHandler(host='localhost', version=1))

  test_logger.info('python-logstash: test logstash info message.')
  try:
      1/0
  except:
      test_logger.exception('python-logstash-logger: Exception with stack trace!')

Using with Django

Modify your settings.py to integrate python3-logstash with Django's logging::

  LOGGING = {
    ...
    'handlers': {
        'logstash': {
            'level': 'DEBUG',
            'class': 'logstash.LogstashHandler',
            'host': 'localhost',
            'port': 5959, # Default value: 5959
            'version': 1, # Version of logstash event schema. Default value: 0 (for backward compatibility of the library)
            'message_type': 'logstash',  # 'type' field in logstash message. Default value: 'logstash'.
            'fqdn': False, # Fully qualified domain name. Default value: false.
            'tags': ['tag1', 'tag2'], # list of tags. Default: None.
        },
    },
    'loggers': {
        'django.request': {
            'handlers': ['logstash'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
    ...
  }

Using with Gunicorn

Create a logging.conf similar to this:

[loggers]
keys=root, logstash.error, logstash.access

[handlers]
keys=console , logstash

[formatters]
keys=generic, access, json

[logger_root]
level=INFO
handlers=console

[logger_logstash.error]
level=INFO
handlers=logstash
propagate=1
qualname=gunicorn.error

[logger_logstash.access]
level=INFO
handlers=logstash
propagate=0
qualname=gunicorn.access

[handler_console]
class=logging.StreamHandler
formatter=generic
args=(sys.stdout, )

[handler_logstash]
class=logstash.TCPLogstashHandler
formatter=json
args=('localhost',5959)

[formatter_generic]
format=%(asctime)s [%(process)d] [%(levelname)s] %(message)s
datefmt=%Y-%m-%d %H:%M:%S
class=logging.Formatter

[formatter_access]
format=%(message)s
class=logging.Formatter

[formatter_json]
class=jsonlogging.JSONFormatter

Note that I am using the jsonlogging module to parse the gunicorn logs

Sample logstash configuration

(logstash.conf) for Receiving Events from python3-logstash is::

  input {
    tcp {
      port => 5000
      codec => json
    }
  }
  output {
    stdout {
      codec => rubydebug
    }
  }