| Table of Contents | ||
|---|---|---|
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Extractor events
Extractors use the RabbitMQ message bus to communicate with Clowder instances. Queues are created for each extractor, and the queue bindings filter the types of Clowder event messages the extractor is notified about. The following non-exhaustive list of events exist in Clowder (messages begin with an asterisk because the exchange name is not required to be 'clowder'):
| message type | trigger event | message payload | examples |
|---|---|---|---|
| *.file.# | when any file is uploaded |
| clowder.file.image.png clowder.file.text.csv clowder.file.application.json |
| *.dataset.file.added | when a file is added to a dataset |
| clowder.dataset.file.added |
| *.dataset.file.removed | when a file is removed from a dataset |
| clowder.dataset.file.removed |
| *.metadata.added | when metadata is added to a file or dataset |
| clowder.metadata.added |
| *.metadata.removed | when metadata is removed from a file or dataset |
| clowder.metadata.removed |
common requirements
| Code Block | ||
|---|---|---|
| ||
sudo -s
export RABBITMQ_URL="amqp://guest:guest@localhost:5672/%2F"
export EXTRACTORS_HOME="/home/clowder"
apt-get -y install git python-pip
pip install pika requests
cd ${EXTRACTORS_HOME}
git clone https://opensource.ncsa.illinois.edu/stash/scm/cats/pyclowder.git
chown -R clowder.users pyclowder |
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