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https://github.com/sprockets/sprockets.mixins.metrics.git
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78 lines
2.7 KiB
ReStructuredText
78 lines
2.7 KiB
ReStructuredText
sprockets.mixins.metrics
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========================
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Adjust counter and timer metrics in InfluxDB or Graphite using the same API.
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.. code-block:: python
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from sprockets.mixins import mediatype, metrics
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from tornado import gen, web
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import queries
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class MyHandler(metrics.StatsdMixin, mediatype.ContentMixin,
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web.RequestHandler):
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def initialize(self):
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super(MyHandler, self).initialize()
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self.db = queries.TornadoSession(os.environ['MY_PGSQL_DSN'])
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@gen.coroutine
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def get(self, obj_id):
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with self.execution_timer('dbquery', 'get'):
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result = yield self.db.query('SELECT * FROM foo WHERE id=%s',
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obj_id)
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self.send_response(result)
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This simple handler will emit a timer metric that identifies each call to the
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``get`` method as well as a separate metric for the database query. Switching
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from using `statsd`_ to `InfluxDB`_ is simply a matter of switch from the
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``metrics.StatsdMixin`` to the ``metrics.InfluxDBMixin``.
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The mix-in is configured through the ``tornado.web.Application`` settings
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property using a key defined by the specific mix-in. The following snippet
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configures the StatsD mix-in from common environment variables:
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.. code-block:: python
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import os
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from sprockets.mixins import metrics
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from tornado import web
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def make_application():
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settings = {
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metrics.StatsdMixin.SETTINGS_KEY: {
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'namespace': 'my-application',
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'host': os.environ.get('STATSD_HOST', '127.0.0.1'),
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'port': os.environ.get('STATSD_PORT', '8125'),
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}
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}
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return web.Application([
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# insert handlers here
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], **settings)
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Development Quickstart
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----------------------
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.. code-block:: bash
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$ python3.4 -mvenv env
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$ env/bin/pip install -r requires/development.txt
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$ . ./env/bin/activate
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(env)$ nosetests
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test_that_cached_socket_is_used (tests.StatsdMethodTimingTests) ... ok
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test_that_counter_accepts_increment_value (tests.StatsdMethodTimingTests) ... ok
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test_that_counter_increment_defaults_to_one (tests.StatsdMethodTimingTests) ... ok
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test_that_default_prefix_is_stored (tests.StatsdMethodTimingTests) ... ok
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test_that_execution_timer_records_time_spent (tests.StatsdMethodTimingTests) ... ok
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test_that_http_method_call_is_recorded (tests.StatsdMethodTimingTests) ... ok
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----------------------------------------------------------------------
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Ran 6 tests in 1.089s
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OK
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(env)$ ./setup.py build_sphinx -q
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running build_sphinx
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(env)$ open build/sphinx/html/index.html
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.. _statsd: https://github.com/etsy/statsd
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.. _InfluxDB: https://influxdata.com
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