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Local Connectors

Local connectors are provided as Docker containers. Using our connector-run utility supports starting connectors in Kubernetes or Docker using a connector config file.

 

Create your first connector locally

This guide will walk you through creating an Inbound HTTP connector to ingest json data from and HTTP endpoint.

You will need a local Fluvio cluster for the connector to send data to.

$ fluvio cluster start

For more details about starting a cluster, see fluvio cluster CLI docs.

And you will need a Rust environment with a copy of our fluvio-connectors repo

$ git clone https://github.com/infinyon/fluvio-connectors.git
 

Example HTTP connector

This is the config file for the Inbound HTTP connector in this guide.

# catfacts-basic-connector.yml
version: 0.4.1
name: cat-facts
type: http-source
topic: cat-facts-data

parameters:
 endpoint: https://catfact.ninja/fact
 interval: 30s

In this config, we are creating a connector named cat-facts. It will request data from a cat fact API once every 30 seconds and receive json data. The connector will store the json into a topic called cat-facts-data

 

Start a connector

You can start a connector in Kubernetes by running

$ cargo run --bin connector-run -- apply --config /path/to/catfacts-basic-connector.yaml
 

List all connectors

To list all connectors in Kubernetes, run kubectl get pods --selector app=fluvio-connector

$ kubectl get pods --selector app=fluvio-connector
 

Look at connector logs

To view the logs of your connectors in Kubernetes, run kubectl logs -l app=fluvio-connector

$ kubectl logs -l app=fluvio-connector
 

View data in topic

The HTTP connector should be receiving data and storing it in a topic with the name we specified.

$ fluvio topic list
  NAME            TYPE      PARTITIONS  REPLICAS  RETENTION TIME  COMPRESSION  STATUS                   REASON
  cat-facts-data  computed  1           1         7days           any          resolution::provisioned

To verify, you can consume from the topic with the fluvio consume CLI.

We are using the -B option to start from the beginning offset of the topic. Once you reach the end of the topic, you can see new data as it is sent to the topic. To exit this live view, press Ctrl+C.

$ fluvio consume cat-facts-data -B
{"fact":"Female felines are \\superfecund","length":31}
{"fact":"Cats only sweat through their paws and nowhere else on their body","length":65}
{"fact":"While many parts of Europe and North America consider the black cat a sign of bad luck, in Britain and Australia, black cats are considered lucky.","length":146}
^C
 

Delete a connector

When you want to stop the connector in Kubernetes, run

$ cargo run --bin connector-run -- delete --config /path/to/catfacts-basic-connector.yaml

Deleting your connector will not delete the topic used by the connector. If you want to delete the topic, you can run fluvio topic delete cat-facts-data

$ fluvio topic delete cat-facts-data
topic "cat-facts-data" deleted
 

Conclusion

And that’s the end of the guide.

Using connector-run, and kubectl we were able to manage our connectors in Kubernetes.

We created a basic Inbound HTTP connector, looked at the logs for the connector, viewed the HTTP response data in the Fluvio topic, and lastly we deleted the connector and topic.

You are ready to create your own connectors! Check out the docs for our supported Inbound and Outbound connector docs try to connect to your own data source.