pywis-pubsub

Overview

pywis-pubsub provides subscription and download capability of WMO data from WIS2 infrastructure services.

Installation

The easiest way to install pywis-pubsub is via the Python pip utility:

pip3 install pywis-pubsub

Requirements

• Python 3
• virtualenv

Dependencies

Dependencies are listed in requirements.txt. Dependencies are automatically installed during pywis-pubsub installation.

Windows installations

Note that you will need Cython and Shapely Windows wheels for windows for your architecture prior to installing pywis-pubsub.

Installing pywis-pubsub

# setup virtualenv
python3 -m venv --system-site-packages pywis-pubsub
cd pywis-pubsub
source bin/activate

# clone codebase and install
git clone https://github.com/wmo-im/pywis-pubsub.git
cd pywis-pubsub
python3 setup.py install

Running

First check pywis-pubsub was correctly installed

pywis-pubsub --version

Subscribing

cp pywis-pubsub-config.yml local.yml
vim local.yml # update accordingly to configure subscribe-options

pywis-pubsub --version

# sync WIS2 notification schema
pywis-pubsub schema sync

# connect, and simply echo messages
pywis-pubsub subscribe --config local.yml

# subscribe, and download data from message
pywis-pubsub subscribe --config local.yml --download

# subscribe, and filter messages by geometry
pywis-pubsub subscribe --config local.yml --bbox=-142,42,-52,84

# subscribe, and filter messages by geometry, increase debugging verbosity
pywis-pubsub subscribe --config local.yml --bbox=-142,42,-52,84 --verbosity=DEBUG

Validating a message and verifying data

# validate a message
pywis-pubsub message validate /path/to/message1.json

# verify data from a message
pywis-pubsub message verify /path/to/message1.json

Publishing

cp pub-config-example.yml pub-local.yml
vim pub-local.yml # update accordingly to configure publishing options

# example publishing a WIS2 notification message with attributes: 
# unique-id=stationXYZ-20221111085500 
# data-url=http://www.meteo.xx/stationXYZ-20221111085500.bufr4 
# lon,lat,elevation=33.8,11.8,112
# wigos_station_identifier=0-20000-12345
pywis-pubsub publish --topic origin/a/wis2/country/centre-id/data/core/weather --config pub-local.yml -i stationXYZ-20221111085500 -u https://example.org/stationXYZ-20221111085500.bufr4 -g 33.8,-11.8,8.112 -w 0-20000-12345

# publish a message from file on disk
pywis-pubsub publish --topic origin/a/wis2/country/centre-id/data/core/weather --config pub-local.yml --file my_message.json

Using the API

Python examples:

# subscriber example
from pywis_pubsub.mqtt import MQTTPubSubClient

options = {
    'storage': {
        'type': 'fs',
        'path': '/tmp'
    },
    'bbox': [-90, -180, 90, 180]
}
topics = [
    'topic1',
    'topic2'
]

m = MQTTPubSubClient('mqtt://localhost:1883', options)
m.sub(topics)

# publish example
from pywis_pubsub.mqtt import MQTTPubSubClient
from pywis_pubsub.publish import create_message

message = create_message(
        topic='foo/bar',
        content_type='application/x-bufr',
        url='http://www.meteo.xx/stationXYZ-20221111085500.bufr4', 
        identifier='stationXYZ-20221111085500', 
        geometry=[33.8, -11.8, 123],
        wigos_station_identifier='0-20000-12345'
)

m = MQTTPubSubClient('mqtt://localhost:1883')
m.pub(topic, json.dumps(message))

Development

Running Tests

# install dev requirements
pip3 install -r requirements-dev.txt

# run tests like this:
python3 tests/run_tests.py

# or this:
python3 setup.py test

Releasing

# create release (x.y.z is the release version)
vi pywis_pubsub/__init__.py  # update __version__
git commit -am 'update release version x.y.z'
git push origin main
git tag -a x.y.z -m 'tagging release version x.y.z'
git push --tags

# upload to PyPI
rm -fr build dist *.egg-info
python3 setup.py sdist bdist_wheel --universal
twine upload dist/*

# publish release on GitHub (https://github.com/wmo-im/pywis-pubsub/releases/new)

# bump version back to dev
vi pywis_pubsub/__init__.py  # update __version__
git commit -am 'back to dev'
git push origin main

Code Conventions

• PEP8

Bugs and Issues

All bugs, enhancements and issues are managed on GitHub.

Contact

• Antje Schremmer
• Tom Kralidis
• Maaike Limper