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Open Data Hub Mobility - Data Collectors

REUSE Compliance

The Open Data Hub Mobility Data Collectors, historically called also Big Data Platform data collectors, and also data providers where contained in this repo, therefore it is called common.

This repository contains the source code of all data collectors, that are Java workers that connect to a remote data pool, such as an API, MQTT broker, FTP server or their like, and download data, aggregate and enriches that, and finally send it to the Big Data Platform writer, which stores it inside a Postgres DB.

We use Keycloak for authentication against the Open Data Hub writer API.

Table of contents

Getting started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. These are just general guidelines, for specific details, refer to the README.md file in each folder.

Prerequisites

To build the data collector project, the following prerequisites must be met:

If you want to run the application using Docker, the environment is already set up with all dependencies for you. You only have to install Docker and Docker Compose and follow the instruction in the dedicated section.

Hint: To be sure to have the correct Java version and build environment equal to our infrastructure use the provided docker configuration.

Source code

Get a copy of the repository:

git clone https://github.com/noi-techpark/bdp-commons.git

Change directory:

cd bdp-commons/data-collectors/[your-collector]

Build

Build the project:

mvn clean package

Run tests

The unit tests can be executed with the following command:

mvn clean test

Development with Docker

  • Inside the corresponding data collector folder, copy .env.example to .env and configure it
  • Run docker-compose up -d
  • You can follow the output with docker-compose logs -f

Please, refer to the README.md inside that folder for further details, and report any incidence to help@opendatahub.com.

VSCode: Start a debug session

Copy this file to .vsode/launch.json:

{
    "version": "0.2.0",
    "configurations": [
		{
			"type": "java",
			"name": "Attach",
			"request": "attach",
			"hostName": "0.0.0.0",
			"port": "9000",
			"justMyCode": false
		}
    ]
}

Run docker-compose up -d inside the data-collector folder of your choice, and then launch Attach from VSCode. You are now ready to set breakpoints and debug.

Develop natively

Change directory into the data collector you want.

You can set the parameters directly as environmental variables (see .env.example) and start it, as follows:

  1. Newer data collectors are Spring Boot applications
mvn spring-boot:run

...or, if you want to use your personalized Spring profile:

cd data-collectors/[your-collector]
cp src/main/resources/application.properties src/main/resources/application-local.properties
# Now open src/main/resources/application-local.properties and modify values as you like
mvn -D spring.profiles.active=local spring-boot:run
  1. Older data collectors are Spring applications with an additional tomcat maven plugin:
mvn tomcat:run \
  -DPARAM1=... \
  -DPARAM2=... \
  -DPARAM3=...

...or, set them inside the relevant .properties files directly (see the corresponding README.md for details), and run:

mvn tomcat:run

Credentials needed?

You do not need special credentials for local development. Use the following Keycloak OAuth parameters inside application.properties to get started immediately (some data collectors have them already as defaults):

authorizationUri=https://auth.opendatahub.testingmachine.eu/auth
tokenUri=https://auth.opendatahub.testingmachine.eu/auth/realms/noi/protocol/openid-connect/token
BASE_URI=http://localhost:8999/json
clientId=odh-mobility-datacollector-development
clientName=odh-mobility-datacollector-development
clientSecret=7bd46f8f-c296-416d-a13d-dc81e68d0830
scope=openid

Or, find the corresponding variable names inside the specific .env files of each data collector, if you develop with docker. Unfortunately, these were not standardized in the past.

If you want to test it on our infrastructure directly, please read about Credentials in our Contributor Guidelines.

Instructions for Maintainers

Deploy a new data collector

  • Copy data-collectors/helloworld/ci-helloworld.yml to .github/workflows/ci-your-new-datacollector.yml
  • Inside that file, replace all helloworld with your-new-datacollector
  • Go to data-collectors/your-new-datacollector
  • Check which docker servers have the least load recently, and choose them for testing and production inside the infrastructure/ansible/hosts file
  • If you need to inject credentials:
    • go to Github Actions Secrets
    • create new credentials with keys in uppercase letters
      • either, prefixed with the data collector name, if they are used only there
      • or with a generic meaningful names, if you use them in more collectors
    • inject them in your Github Action Yaml like ${{ secrets.HELLOWORLD_SECRET_1 }}

Update pom dependencies

To update a dependency in all data-collectors the quickversionbump scripts can be used.

  • quickversionbump.sh: update dc-interface
  • quickversionbump-generic.sh: update any dependency
  • quickversionbump-min.sh: update min version in properties, if dependency is not used but a minimal version is mandatory

Note: Read the comments in every script for further instructions

Information

Support

For support, please contact help@opendatahub.com.

Contributing

If you want to write a new Data Collector:

  1. Read and follow our Getting Started guidelines
  2. Copy/paste the helloworld example in a new folder under data-collectors, choose the name of your data collector for that folder
  3. Find TODO comments and follow their instructions
  4. See and alter code inside SyncScheduler.java
  5. Start the writer API locally and test everything:
    • Writer API with Docker
    • Start your data collector
    • Check log outputs of the writer and the data collector to find issues
    • Connect to the DB, and see what is their after some tests
  6. Create a pull request as described in the guidelines above

Documentation

More documentation can be found at https://docs.opendatahub.com.

License

The code in this project is licensed under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 license.

See the LICENSE file for more information.

REUSE

This project is REUSE compliant, more information about the usage of REUSE in NOI Techpark repositories can be found here.

Since the CI for this project checks for REUSE compliance you might find it useful to use a pre-commit hook checking for REUSE compliance locally. The pre-commit-config file in the repository root is already configured to check for REUSE compliance with help of the pre-commit tool.

Install the tool by running:

pip install pre-commit

Then install the pre-commit hook via the config file by running:

pre-commit install