Testing

Let's build and run the server and worker of the application. You should start a container with a RabbitMQ instance, as we did in this chapter in the Bootstrap message broker for testing section. Then, use cargo build to build all the parts.

When compilation has finished, start a server instance:

RUST_LOG=rabbit_actix_server=debug ./target/debug/rabbit-actix-server

Also, start a worker instance with the following command:

RUST_LOG=rabbit_actix_worker=debug ./target/debug/rabbit-actix-worker

When both parts have started, you can explore RabbitMQ with the rabbitmqctl command and explore your queues:

docker exec -it test-rabbit rabbitmqctl list_queues

It prints both the queues that were created by the actors:

Timeout: 60.0 seconds ...
Listing queues for vhost / ...
responses    0
requests    0

If you want to see all connected consumers, you can do that with the following command:

docker exec -it test-rabbit rabbitmqctl list_consumers

It prints responses-consumer, which represents a server instance, and requests-consumer, which represents a worker instance:

Listing consumers on vhost / ...
responses  <rabbit@f137a225a709.3.697.0>  responses-consumer   true    0    []
requests   <rabbit@f137a225a709.3.717.0>  requests-consumer    true    0    []

Now that everything is connected to RabbitMQ, we can open http://localhost:8080/tasks in a browser. You will see an empty table and a form to upload a QR code. Choose a file and upload it using the form. It will refresh the page and you will see your task in progress:

 

If the worker works properly and if you refresh the page after short period of time, you will see the decoded QR code:

As you can see, the server and worker interact with a message that was delivered by RabbitMQ.

Let's discuss the benefits and drawbacks of this solution.