Python

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Installation

Currently Metlo’s Python Agent supports 2 servers:

• Django
• Flask

It can be installed from pypi by running :

pip install metlo

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Configuration

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Django

Once installed, Metlo’s middleware can be added by modifying middlewares list (in the projects settings.py) like so:

MIDDLEWARE = [
    ...,
    "metlo.django.MetloDjango",
]

and configuring a METLO_CONFIG attribute in the projects settings.py like this :

METLO_CONFIG = {
    "API_KEY": "<YOUR_METLO_API_KEY>",
    "METLO_HOST": "http://<YOUR_METLO_HOST>:8081"
}

METLO_CONFIG can take an optional key-value pair (as “workers”:number) representing the max number of workers for communicating with Metlo.

METLO_CONFIG = {
    "API_KEY": "<YOUR_METLO_API_KEY>",
    "METLO_HOST": "http://<YOUR_METLO_HOST>:8081",
    "workers": <Integer, default 4>
}

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Disabling during testing

METLO_CONFIG takes an optional key-value pair for disabling metlo during testing or development. It can be added as (“DISABLED”: boolean). It defaults to False so that metlo captures your traces by default.

METLO_CONFIG = {
    "API_KEY": "<YOUR_METLO_API_KEY>",
    "METLO_HOST": "http://<YOUR_METLO_HOST>:8081",
    "DISABLED": <Boolean, default False>
}

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Flask

Once installed, Metlo middleware can be added simply like :

from flask import Flask

from metlo.flask import MetloFlask

app = Flask(__name__)
MetloFlask(app, "http://<YOUR_METLO_HOST>:8081", "<YOUR_METLO_API_KEY>")

The Flask Middleware takes the flask app, Metlo collector url, and the Metlo API Key as parameters. As an optional parameter, a named value can be passed for max number of workers for communicating with Metlo.

MetloFlask(app, "http://<YOUR_METLO_HOST>:8081", "<YOUR_METLO_API_KEY>", workers=<Integer, default 4>)

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Disabling during testing

Metlo can take an optional named parameter (as “disabled”:boolean) for disabling metlo during testing.

MetloFlask(app, "http://<YOUR_METLO_HOST>:8081", "<YOUR_METLO_API_KEY>", disabled=<Boolean, default False>)