openkongqi - outdoor air quality data

Fetch outdoor air quality data from multiple resources, the system is made of the following components:

• fetching: fetches resources to create the raw material for air quality data. That material is saved to create a history and possibility to fix errors after the fact.
• data extraction: extract the data from the raw material to create data feeds.
• data reliability: determine which data source is the most reliable at any given time.

Architecture

The data flow from online resource to reliable data point is broken down as follow:

• sources: online resources that provide the data, polled at regular interval and cached for archive purpose
• feeds: extracted data from sources, feeds are saved as time series in a database
• datapoint: extracted from feeds using an election algorithm to provide the most reliable data

Configuration

The default local configuration file is okqconfig.py, this can be changed using the environment variable OKQ_CONFMODULE. The okqconfig.py file should define a dict called settings, this dict can be used to overwrite any configuration option defined in the global_settings of openkongqi.conf.

Station UUID

Each station needs to be attached to a unique identier, a station identifier is of the following formats:

CC/STATION
CC/CITY/STATION
CC/STATE/CITY/STATION

The following fragments compose the UUID:

• CC: country code - a two letter country code as defined by ISO 3166-1 alpha-2, mandatory.
• STATE: state name - state name
• CITY: city name - city name
• STATION: stations name - station name, mandatory.

All names have to be expressed in Uppercase or lowercase or numeric latin letters.

Install

Make sure the lxml package is installed, on debian:

$ apt-get install python-lxml

Install the code:

$ pip install -U pip
$ pip install pip-tools
$ pip-sync requirements.txt

Development

Install development environment:

$ pip install -r requirements-dev.txt

Create necessary database & tables:

(openkongqi)$ python -c "import openkongqi.bin; openkongqi.bin.okq_init()"

Run celery:

(openkongqi)$ python openkongqi/bin.py worker --loglevel=debug --concurrency=1 --autoreload -B

Test

Test the package:

$ python -m unittest discover

Automatic testing in various environments:

$ tox

Versioning

Openkongqi tries to follow the PEP 440 / Semver conventions as defined by PyPA

To update the version of the package, use the following command:

$ bumpr -b -m

Packaging

Create packages:

$ python setup.py sdist bdist_wheel

Push package:

$ twine upload dist/*
$ twine upload -r pypi dist/*

Name origin

Kōngqì (空气) is the Chinese word for air/atmosphere.

License

This software is licensed under the Apache License 2.0. See the LICENSE file in the top distribution directory for the full license text.