mirror of
https://github.com/sprockets/sprockets-influxdb.git
synced 2024-11-15 03:00:24 +00:00
656 lines
21 KiB
Python
656 lines
21 KiB
Python
"""
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Sprockets InfluxDB
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==================
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`sprockets_influxdb` includes both a buffering InfluxDB client and a Tornado
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RequestHandler mixin.
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"""
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import contextlib
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import logging
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import os
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import socket
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import time
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try:
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from ietfparse import headers
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from tornado import concurrent, httpclient, ioloop
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except ImportError: # pragma: no cover
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logging.critical('Could not import Tornado')
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headers, concurrent, httpclient, ioloop = None, None, None, None
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version_info = (1, 0, 4)
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__version__ = '.'.join(str(v) for v in version_info)
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__all__ = ['__version__', 'version_info', 'add_measurement', 'flush',
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'install', 'shutdown', 'Measurement']
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LOGGER = logging.getLogger(__name__)
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REQUEST_DATABASE = 'sprockets_influxdb.database'
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USER_AGENT = 'sprockets-influxdb/v{}'.format(__version__)
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_base_tags = {}
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_base_url = 'http://localhost:8086/write'
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_credentials = None, None
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_dirty = False
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_http_client = None
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_installed = False
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_io_loop = None
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_last_warning = None
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_measurements = {}
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_max_batch_size = 5000
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_max_clients = 10
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_periodic_callback = None
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_periodic_future = None
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_stopping = False
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_warn_threshold = 5000
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_writing = False
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class InfluxDBMixin(object):
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"""Mixin that automatically submits per-request measurements to InfluxDB
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with the request duration.
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The measurements will automatically add the following tags:
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- Request :data:`handler`
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- Request :data:`endpoint` (if enabled via a named URL)
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- Request :data:`method`
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- Request :data:`correlation_id` (if set)
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- Response :data:`status_code`
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To add additional tags and fields, use the
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:meth:`~sprockets_influxdb.Measurement.set_field`,
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:meth:`~sprockets_influxdb.Measurement.set_tag`,
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:meth:`~sprockets_influxdb.Measurement.set_tags`, and
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:meth:`~sprockets_influxdb.Measurement.timer` methods of the
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``influxdb`` attribute of the :class:`~tornado.web.RequestHandler`.
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"""
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def __init__(self, application, request, **kwargs):
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self.influxdb = Measurement(
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application.settings[REQUEST_DATABASE],
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application.settings.get('service', 'request'))
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super(InfluxDBMixin, self).__init__(application, request, **kwargs)
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handler = '{}.{}'.format(self.__module__, self.__class__.__name__)
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self.influxdb.set_tags({'handler': handler, 'method': request.method})
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for host, handlers in application.handlers:
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if not host.match(request.host):
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continue
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for handler in handlers:
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match = handler.regex.match(request.path)
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if match:
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self.influxdb.set_tag('endpoint',
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handler.regex.pattern.rstrip('$'))
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break
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def on_finish(self):
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self.influxdb.set_field('content_length',
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int(self._headers['Content-Length']))
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if hasattr(self, 'correlation_id'):
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self.influxdb.set_field('correlation_id', self.correlation_id)
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self.influxdb.set_field('duration', self.request.request_time())
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parsed = headers.parse_content_type(
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self._headers['Content-Type'].decode('utf-8'))
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self.influxdb.set_tag(
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'content_type', '{}/{}'.format(
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parsed.content_type, parsed.content_subtype))
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self.influxdb.set_tag('status_code', self._status_code)
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add_measurement(self.influxdb)
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def add_measurement(measurement):
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"""Add measurement data to the submission buffer for eventual writing to
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InfluxDB.
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Example:
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.. code:: python
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import sprockets_influxdb as influxdb
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measurement = influxdb.Measurement('example', 'measurement-name')
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measurement.set_tag('foo', 'bar')
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measurement.set_field('baz', 1.05)
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influxdb.add_measurement(measurement)
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:param :class:`~sprockets_influxdb.Measurement` measurement: The
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measurement to add to the buffer for submission to InfluxDB.
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"""
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if _stopping:
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LOGGER.warning('Discarding measurement for %s while stopping',
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measurement.database)
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return
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if not measurement.fields:
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raise ValueError('Measurement does not contain a field')
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if measurement.database not in _measurements:
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_measurements[measurement.database] = []
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value = measurement.marshall()
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_measurements[measurement.database].append(value)
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_maybe_warn_about_buffer_size()
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def flush():
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"""Flush all pending measurements to InfluxDB. This will ensure that all
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measurements that are in the buffer for any database are written. If the
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requests fail, it will continue to try and submit the metrics until they
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are successfully written.
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:rtype: :class:`~tornado.concurrent.Future`
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"""
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LOGGER.debug('Flushing')
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flush_future = concurrent.TracebackFuture()
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if _periodic_future and not _periodic_future.done():
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LOGGER.debug('Waiting on _periodic_future instead')
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write_future = _periodic_future
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else:
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write_future = _write_measurements()
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_flush_wait(flush_future, write_future)
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return flush_future
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def install(url=None, auth_username=None, auth_password=None, io_loop=None,
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submission_interval=5000, max_batch_size=1000, max_clients=10,
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base_tags=None):
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"""Call this to install/setup the InfluxDB client collector. All arguments
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are optional.
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:param str url: The InfluxDB API URL. If URL is not specified, the
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``INFLUXDB_SCHEME``, ``INFLUXDB_HOST`` and ``INFLUXDB_PORT``
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environment variables will be used to construct the base URL. Default:
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``http://localhost:8086/write``
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:param str auth_username: A username to use for InfluxDB authentication. If
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not specified, the ``INFLUXDB_USER`` environment variable will
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be used. Default: ``None``
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:param str auth_password: A password to use for InfluxDB authentication. If
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not specified, the ``INFLUXDB_PASSWORD`` environment variable will
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be used. Default: ``None``
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:param io_loop: A :class:`~tornado.ioloop.IOLoop` to use instead of the
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version returned by :meth:`~tornado.ioloop.IOLoop.current`
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:type io_loop: :class:`tornado.ioloop.IOLoop`
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:param int submission_interval: How often to submit metric batches in
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milliseconds. Default: ``5000``
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:param int max_batch_size: The number of measurements to be submitted in a
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single HTTP request. Default: ``1000``
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:param int max_clients: The number of simultaneous batch submissions that
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may be made at any given time. Default: ``10``
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:param dict base_tags: Default tags that are to be submitted with each
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measurement. Default: ``None``
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:returns: :data:`True` if the client was installed by this call
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and :data:`False` otherwise.
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If ``INFLUXDB_PASSWORD`` is specified as an environment variable, it will
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be masked in the Python process.
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"""
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global _base_tags, _base_url, _credentials, _installed, _io_loop, \
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_max_batch_size, _max_clients, _periodic_callback
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if _installed:
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LOGGER.warning('InfluxDB client already installed')
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return False
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_base_url = url or '{}://{}:{}/write'.format(
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os.environ.get('INFLUXDB_SCHEME', 'http'),
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os.environ.get('INFLUXDB_HOST', 'localhost'),
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os.environ.get('INFLUXDB_PORT', 8086))
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_credentials = (auth_username or os.environ.get('INFLUXDB_USER', None),
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auth_password or os.environ.get('INFLUXDB_PASSWORD', None))
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# Don't leave the environment variable out there with the password
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if os.environ.get('INFLUXDB_PASSWORD'):
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os.environ['INFLUXDB_PASSWORD'] = \
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'X' * len(os.environ['INFLUXDB_PASSWORD'])
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# Submission related values
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_io_loop = io_loop or ioloop.IOLoop.current()
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_max_batch_size = max_batch_size
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_max_clients = max_clients
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_periodic_callback = ioloop.PeriodicCallback(
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_on_periodic_callback, submission_interval, _io_loop)
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# Set the base tags
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_base_tags.setdefault('hostname', socket.gethostname())
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if os.environ.get('ENVIRONMENT'):
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_base_tags.setdefault('environment', os.environ['ENVIRONMENT'])
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_base_tags.update(base_tags or {})
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# Start the periodic callback on IOLoop start
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_io_loop.add_callback(_periodic_callback.start)
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# Don't let this run multiple times
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_installed = True
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return True
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def set_auth_credentials(username, password):
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"""Override the default authentication credentials obtained from the
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environment variable configuration.
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:param str username: The username to use
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:param str password: The password to use
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"""
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global _credentials, _dirty
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LOGGER.debug('Setting authentication credentials')
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_credentials = username, password
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_dirty = True
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def set_base_url(url):
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"""Override the default base URL value created from the environment
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variable configuration.
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:param str url: The base URL to use when submitting measurements
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"""
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global _base_url, _dirty
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LOGGER.debug('Setting base URL to %s', url)
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_base_url = url
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_dirty = True
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def set_io_loop(io_loop):
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"""Override the use of the default IOLoop.
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:param tornado.ioloop.IOLoop io_loop: The IOLoop to use
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:raises: ValueError
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"""
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global _dirty, _io_loop
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if not isinstance(io_loop, ioloop.IOLoop):
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raise ValueError('Invalid io_loop value')
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LOGGER.debug('Overriding the default IOLoop, using %r', io_loop)
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_dirty = True
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_io_loop = io_loop
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def set_max_batch_size(limit):
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"""Set a limit to the number of measurements that are submitted in
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a single batch that is submitted per databases.
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:param int limit: The maximum number of measurements per batch
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"""
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global _max_batch_size
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LOGGER.debug('Setting maximum batch size to %i', limit)
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_max_batch_size = limit
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def set_max_clients(limit):
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"""Set the maximum number of simultaneous batch submission that can execute
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in parallel.
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:param int limit: The maximum number of simultaneous batch submissions
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"""
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global _dirty, _max_clients
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LOGGER.debug('Setting maximum client limit to %i', limit)
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_dirty = True
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_max_clients = limit
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def set_submission_interval(seconds):
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"""Override how often to submit measurements to InfluxDB.
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:param int seconds: How often to wait in seconds
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"""
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global _periodic_callback
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LOGGER.debug('Setting submission interval to %s seconds', seconds)
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if _periodic_callback.is_running():
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_periodic_callback.stop()
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_periodic_callback = ioloop.PeriodicCallback(_on_periodic_callback,
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seconds, _io_loop)
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# Start the periodic callback on IOLoop start if it's not already started
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_io_loop.add_callback(_periodic_callback.start)
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def shutdown():
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"""Invoke on shutdown of your application to stop the periodic
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callbacks and flush any remaining metrics.
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Returns a future that is complete when all pending metrics have been
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submitted.
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:rtype: :class:`~tornado.concurrent.Future`
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"""
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global _stopping
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if _stopping:
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LOGGER.warning('Already shutting down')
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return
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_stopping = True
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if _periodic_callback.is_running():
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_periodic_callback.stop()
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LOGGER.info('Stopped periodic measurement submission and writing current '
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'buffer to InfluxDB')
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return flush()
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def _create_http_client():
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"""Create the HTTP client with authentication credentials if required."""
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global _http_client
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defaults = {'user_agent': USER_AGENT}
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auth_username, auth_password = _credentials
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if auth_username and auth_password:
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defaults['auth_username'] = auth_username
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defaults['auth_password'] = auth_password
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_http_client = httpclient.AsyncHTTPClient(
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force_instance=True, defaults=defaults, io_loop=_io_loop,
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max_clients=_max_clients)
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def _flush_wait(flush_future, write_future):
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"""Pause briefly allowing any pending metric writes to complete before
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shutting down.
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:param future tornado.concurrent.TracebackFuture: The future to resolve
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when the shutdown is complete.
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"""
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if write_future.done():
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if not _pending_measurements():
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flush_future.set_result(True)
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return
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else:
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write_future = _write_measurements()
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_io_loop.add_timeout(
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_io_loop.time() + 0.25, _flush_wait, flush_future, write_future)
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def _futures_wait(wait_future, futures):
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"""Waits for all futures to be completed. If the futures are not done,
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wait 100ms and then invoke itself via the ioloop and check again. If
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they are done, set a result on `wait_future` indicating the list of
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futures are done.
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:param wait_future: The future to complete when all `futures` are done
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:type wait_future: tornado.concurrent.Future
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:param list futures: The list of futures to watch for completion
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"""
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global _writing
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remaining = []
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for (future, database, measurements) in futures:
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# If the future hasn't completed, add it to the remaining stack
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if not future.done():
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remaining.append((future, database, measurements))
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continue
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# Get the result of the HTTP request, processing any errors
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try:
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result = future.result()
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except (httpclient.HTTPError, OSError, socket.error) as error:
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_on_request_error(error, database, measurements)
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else:
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if result.code >= 400:
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_on_request_error(result.code, database, measurements)
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# If there are futures that remain, try again in 100ms.
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if remaining:
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return _io_loop.add_timeout(
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_io_loop.time() + 0.1, _futures_wait, wait_future, remaining)
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_writing = False
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wait_future.set_result(True)
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def _maybe_warn_about_buffer_size():
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"""Check the buffer size and issue a warning if it's too large and
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a warning has not been issued for more than 60 seconds.
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"""
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global _last_warning
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if not _last_warning:
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_last_warning = time.time()
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count = _pending_measurements()
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if count > _warn_threshold and (time.time() - _last_warning) > 60:
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LOGGER.warning('InfluxDB measurement buffer has %i entries', count)
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def _on_periodic_callback():
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"""Invoked periodically to ensure that metrics that have been collected
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are submitted to InfluxDB. If metrics are still being written when it
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is invoked, pass until the next time.
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:rtype: tornado.concurrent.Future
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"""
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global _periodic_future
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if isinstance(_periodic_future, concurrent.Future) \
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and not _periodic_future.done():
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LOGGER.warning('Metrics are currently being written, '
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'skipping write interval')
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return
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_periodic_future = _write_measurements()
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return _periodic_future
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def _on_request_error(error, database, measurements):
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"""Handle a batch submission error, logging the problem and adding the
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measurements back to the stack.
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:param mixed error: The error that was returned
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:param str database: The database the submission failed for
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:param list measurements: The measurements to add back to the stack
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"""
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LOGGER.error('Error submitting batch to %s: %r', database, error)
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_measurements[database] = measurements + _measurements[database]
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def _pending_measurements():
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"""Return the number of measurements that have not been submitted to
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InfluxDB.
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:rtype: int
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"""
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return sum([len(_measurements[dbname]) for dbname in _measurements])
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def _write_measurements():
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"""Write out all of the metrics in each of the databases,
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returning a future that will indicate all metrics have been written
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when that future is done.
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:rtype: tornado.concurrent.Future
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"""
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global _writing
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future = concurrent.TracebackFuture()
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if _writing:
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LOGGER.warning('Currently writing measurements, skipping write')
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future.set_result(False)
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elif not _pending_measurements():
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future.set_result(True)
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# Exit early if there's an error condition
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if future.done():
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return future
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if not _http_client or _dirty:
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_create_http_client()
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# Keep track of the futures for each batch submission
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futures = []
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# Submit a batch for each database
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for database in _measurements:
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url = '{}?db={}&precision=seconds'.format(_base_url, database)
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# Get the measurements to submit
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measurements = _measurements[database][:_max_batch_size]
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# Pop them off the stack of pending measurements
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_measurements[database] = _measurements[database][_max_batch_size:]
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# Create the request future
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request = _http_client.fetch(
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url, method='POST', body='\n'.join(measurements).encode('utf-8'))
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# Keep track of each request in our future stack
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futures.append((request, database, measurements))
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# Start the wait cycle for all the requests to complete
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_writing = True
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_futures_wait(future, futures)
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return future
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class Measurement(object):
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"""The :class:`Measurement` class represents what will become a single row
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in an InfluxDB database. Measurements are added to InfluxDB via the
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:meth:`~sprockets_influxdb.add_measurement` method.
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Example:
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.. code:: python
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import sprockets_influxdb as influxdb
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measurement = Measurement('database-name', 'measurement-name')
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measurement.set_tag('foo', 'bar')
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measurement.set_field('baz', 1.05)
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influxdb.add_measurement(measurement)
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:param str database: The database name to use when submitting
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:param str name: The measurement name
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"""
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def __init__(self, database, name):
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self.database = database
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self.name = name
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self.fields = {}
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self.tags = dict(_base_tags)
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@contextlib.contextmanager
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def duration(self, name):
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"""Record the time it takes to run an arbitrary code block.
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:param str name: The field name to record the timing in
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This method returns a context manager that records the amount
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of time spent inside of the context, adding the timing to the
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measurement.
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"""
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start = time.time()
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try:
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yield
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finally:
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self.set_field(name, max(time.time(), start) - start)
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def marshall(self):
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"""Return the measurement in the line protocol format.
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:rtype: str
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"""
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return '{},{} {} {}'.format(
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self._escape(self.name),
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','.join(['{}={}'.format(self._escape(k), self._escape(v))
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for k, v in self.tags.items()]),
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self._marshall_fields(),
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int(time.time()))
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def set_field(self, name, value):
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"""Set the value of a field in the measurement.
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:param str name: The name of the field to set the value for
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:param int|float|bool|str value: The value of the field
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:raises: ValueError
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"""
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if not any([isinstance(value, t) for t in {int, float, bool, str}]):
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LOGGER.debug('Invalid field value: %r', value)
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raise ValueError('Value must be a str, bool, integer, or float')
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self.fields[name] = value
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def set_tag(self, name, value):
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"""Set a tag on the measurement.
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:param str name: name of the tag to set
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:param str value: value to assign
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This will overwrite the current value assigned to a tag
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if one exists.
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"""
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self.tags[name] = value
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def set_tags(self, tags):
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"""Set multiple tags for the measurement.
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:param dict tags: Tag key/value pairs to assign
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This will overwrite the current value assigned to a tag
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if one exists with the same name.
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"""
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for key, value in tags.items():
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self.set_tag(key, value)
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@staticmethod
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def _escape(value):
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"""Escape a string (key or value) for InfluxDB's line protocol.
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:param str|int|float|bool value: The value to be escaped
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:rtype: str
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"""
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value = str(value)
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for char, escaped in {' ': '\ ', ',': '\,', '"': '\"'}.items():
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value = value.replace(char, escaped)
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return value
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def _marshall_fields(self):
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"""Convert the field dict into the string segment of field key/value
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pairs.
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:rtype: str
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"""
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values = {}
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for key, value in self.fields.items():
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if (isinstance(value, int) or
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(isinstance(value, str) and value.isdigit() and
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'.' not in value)):
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values[key] = '{}i'.format(value)
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elif isinstance(value, bool):
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values[key] = self._escape(value)
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elif isinstance(value, float):
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values[key] = '{}'.format(value)
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elif isinstance(value, str):
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values[key] = '"{}"'.format(self._escape(value))
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return ','.join(['{}={}'.format(self._escape(k), v)
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for k, v in values.items()])
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