Log robot commands to a topic

[mdub]

Make it easy to append "robot commands" to a Kafka topic.

[mdub]

We created a development environment using docker-compose, running zookeeper and kafka locally, based on recipes from Confluent Inc.

• auto/dev/setup starts Kafka and creates a "robot-commands" topic (if it doesn't exist)

Then we created a little Ruby script, based on the ruby-kafka gem. It validates commands and appends JSON-formatterd events to the topic, e.g.

$ ./auto/dev/robctl bobby control
... startup messages ...
> place 1 2 n
OK
> left
OK

We can watch them appearing with:

$ ./auto/dev/console scripts/watch
... startup messages ...
{"robot":"bobby","type":"place","event":{"x":1,"y":2,"direction":"n"}}
{"robot":"bobby","type":"rotate","event":{"direction":"left"}}