This repository contains my solution to the Synthesia challenge.
In this README, you can find instructions on how to build and run the app.
For more information about the design of the solution, tradeoffs made and more, head to the Tech Design document.
- (Optional) Maven
- (Optional) Coretto 11 JDK
- Docker
- Docker Compose
The app depends on certain version of the containers. You can download them by running:
docker pull localstack/localstack:2.2
docker pull redis:6.2-alpine
To build the application locally, run make build (this will not build the container).
To build the application directly inside of a container, run make docker.
A GitHub Action was created to showcase the build step in action.
To run the application (inside of Docker), you need to:
- Start the infrastructure (Redis, AWS):
make infra - Start the application:
API_KEY=<the provided key> make run - Stop all the running containers:
make stop
Once the application and the infrastructure is app and running, you should see something like:
synthesia-synthesia-app-1 | [main] INFO io.javalin.Javalin - Starting Javalin ...
synthesia-synthesia-app-1 | [main] INFO org.eclipse.jetty.server.Server - jetty-11.0.15; built: 2023-04-11T18:37:53.775Z; git: 5bc5e562c8d05c5862505aebe5cf83a61bdbcb96; jvm 11.0.20+8-LTS
synthesia-synthesia-app-1 | [main] INFO org.eclipse.jetty.server.session.DefaultSessionIdManager - Session workerName=node0
synthesia-synthesia-app-1 | [main] INFO org.eclipse.jetty.server.handler.ContextHandler - Started i.j.j.@5866731{/,null,AVAILABLE}
synthesia-synthesia-app-1 | [main] INFO org.eclipse.jetty.server.AbstractConnector - Started ServerConnector@4b7ed03e{HTTP/1.1, (http/1.1)}{0.0.0.0:7070}
synthesia-synthesia-app-1 | [main] INFO org.eclipse.jetty.server.Server - Started Server@2bec068b{STARTING}[11.0.15,sto=0] @1986ms
synthesia-synthesia-app-1 | [main] INFO io.javalin.Javalin -
synthesia-synthesia-app-1 | __ ___ ______
synthesia-synthesia-app-1 | / /___ __ ______ _/ (_)___ / ____/
synthesia-synthesia-app-1 | __ / / __ `/ | / / __ `/ / / __ \ /___ \
synthesia-synthesia-app-1 | / /_/ / /_/ /| |/ / /_/ / / / / / / ____/ /
synthesia-synthesia-app-1 | \____/\__,_/ |___/\__,_/_/_/_/ /_/ /_____/
synthesia-synthesia-app-1 |
synthesia-synthesia-app-1 | https://javalin.io/documentation
synthesia-synthesia-app-1 |
synthesia-synthesia-app-1 |
synthesia-synthesia-app-1 | [main] INFO io.javalin.Javalin - Listening on http://localhost:7070/
synthesia-synthesia-app-1 | [main] INFO io.javalin.Javalin - You are running Javalin 5.6.2 (released July 31, 2023).
synthesia-synthesia-app-1 | [main] INFO io.javalin.Javalin - Javalin started in 183ms \o/
synthesia-synthesia-app-1 | [pool-3-thread-1] INFO io.synthesia.async.MessageSigningConsumer - MessageSigningConsumer started
synthesia-synthesia-app-1 | [pool-3-thread-1] INFO io.synthesia.async.SqsMessageSigningQueue - Receive messages from http://localstack:4566/000000000000/sign-queue
synthesia-synthesia-app-1 | [pool-4-thread-1] INFO io.synthesia.async.MessageSingingProcessor - MessageSingingProcessor started
...
After that, simply send a POST request to http://localhost:7070/crypto/sign with the message and the webhook URL in the body:
curl --location 'http://localhost:7070/crypto/sign?message=test&webhookUrl=http%3A%2F%2F127.0.0.1%3A7070%2Fwebhook' --verbose
The app exposes an additional /webhook endpoint to facilitate local testing.