Sanic Support

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Incorporating Elastic APM into your Sanic project only requires a few easy steps.

Installation

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Install the Elastic APM agent using pip:

$ pip install elastic-apm

or add elastic-apm to your project’s requirements.txt file.

Setup

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To set up the agent, you need to initialize it with appropriate settings.

The settings are configured either via environment variables, or as initialization arguments.

You can find a list of all available settings in the Configuration page.

To initialize the agent for your application using environment variables:

from sanic import Sanic
from elasticapm.contrib.sanic import ElasticAPM

app = Sanic(name="elastic-apm-sample")
apm = ElasticAPM(app=app)

To configure the agent using initialization arguments and Sanic’s Configuration infrastructure:

# Create a file named external_config.py in your application
# If you want this module based configuration to be used for APM, prefix them with ELASTIC_APM_
ELASTIC_APM_SERVER_URL = "https://serverurl.apm.com:443"
ELASTIC_APM_SECRET_TOKEN = "sometoken"
from sanic import Sanic
from elasticapm.contrib.sanic import ElasticAPM

app = Sanic(name="elastic-apm-sample")
app.config.update_config("path/to/external_config.py")
apm = ElasticAPM(app=app)

Usage

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Once you have configured the agent, it will automatically track transactions and capture uncaught exceptions within sanic.

Capture an arbitrary exception by calling capture_exception:

from sanic import Sanic
from elasticapm.contrib.sanic import ElasticAPM

app = Sanic(name="elastic-apm-sample")
apm = ElasticAPM(app=app)

try:
    1 / 0
except ZeroDivisionError:
    apm.capture_exception()

Log a generic message with capture_message:

from sanic import Sanic
from elasticapm.contrib.sanic import ElasticAPM

app = Sanic(name="elastic-apm-sample")
apm = ElasticAPM(app=app)

apm.capture_message('hello, world!')

Performance metrics

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If you’ve followed the instructions above, the agent has installed our instrumentation middleware which will process all requests through your app. This will measure response times, as well as detailed performance data for all supported technologies.

Due to the fact that asyncio drivers are usually separate from their synchronous counterparts, specific instrumentation is needed for all drivers. The support for asynchronous drivers is currently quite limited.

Ignoring specific routes
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You can use the TRANSACTIONS_IGNORE_PATTERNS configuration option to ignore specific routes. The list given should be a list of regular expressions which are matched against the transaction name:

from sanic import Sanic
from elasticapm.contrib.sanic import ElasticAPM

app = Sanic(name="elastic-apm-sample")
apm = ElasticAPM(app=app, config={
    'TRANSACTIONS_IGNORE_PATTERNS': ['^GET /secret', '/extra_secret'],
})

This would ignore any requests using the GET /secret route and any requests containing /extra_secret.

Extended Sanic APM Client Usage

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Sanic’s contributed APM client also provides a few extendable way to configure selective behaviors to enhance the information collected as part of the transactions being tracked by the APM.

In order to enable this behavior, the APM Client middleware provides a few callback functions that you can leverage in order to simplify the process of generating additional contexts into the traces being collected.

Callback Name Callback Invocation Format Expected Return Format Is Async

transaction_name_callback

transaction_name_callback(request)

string

false

user_context_callback

user_context_callback(request)

(username_string, user_email_string, userid_string)

true

custom_context_callback

custom_context_callback(request) or custom_context_callback(response)

dict(str=str)

true

label_info_callback

label_info_callback()

dict(str=str)

true

Supported Sanic and Python versions

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A list of supported Sanic and Python versions can be found on our Supported Technologies page.

Elastic APM only supports asyncio when using Python 3.7+