Akkounts

Small demo project for Akka, its use case is bank accounts: deposit, withdraw and get the balance. Akkounts is a distributed system making use of Akka Cluster. It employs Event Sourcing and CQRS enabled by Akka Persistence and Akka Persistence Query and offers a HTTP/JSON API through Akka HTTP. Domain logic processing is using Akka Streams and Streamee processors.

Run locally

Make sure to run Cassandra or Scylla locally using the default ports. You can use the provided docker-compose.yml and simply run docker-compose up.

Then run sbt r1 (r1 is defined as a command alias in build.sbt) to start a node with all relevant services bound to 127.0.0.1. You can also run sbt r2, but first you have to add 127.0.0.2 as a network interface, e.g. via sudo ifconfig lo0 alias 127.0.0.2 on macOS.

Usage Example

Assuming you have HTTPie installed, you can call the HTTP API like this:

~/code/scala/rocks.heikoseeberger/akkounts(master ✗) http 127.0.0.1:8080/42/deposit amount:=10
HTTP/1.1 201 Created
Content-Length: 21
Content-Type: application/json
Date: Wed, 05 Feb 2020 17:00:51 GMT
Server: akka-http/10.1.11

"Deposited amount 10"

~/code/scala/rocks.heikoseeberger/akkounts(master ✗) http 127.0.0.1:8080/42/withdraw amount:=7
HTTP/1.1 201 Created
Content-Length: 20
Content-Type: application/json
Date: Wed, 05 Feb 2020 17:00:55 GMT
Server: akka-http/10.1.11

"Withdrawn amount 7"

~/code/scala/rocks.heikoseeberger/akkounts(master ✗) http 127.0.0.1:8080/42/withdraw amount:=5
HTTP/1.1 400 Bad Request
Content-Length: 38
Content-Type: application/json
Date: Wed, 05 Feb 2020 17:00:56 GMT
Server: akka-http/10.1.11

"Insufficient balance 3 for amount 5!"

~/code/scala/rocks.heikoseeberger/akkounts(master ✗) http 127.0.0.1:8080/42
HTTP/1.1 200 OK
Content-Length: 14
Content-Type: application/json
Date: Wed, 05 Feb 2020 17:01:05 GMT
Server: akka-http/10.1.11

"Balance is 3"

Run in k8s

TODO

Contribution policy

Contributions via GitHub pull requests are gladly accepted from their original author. Along with any pull requests, please state that the contribution is your original work and that you license the work to the project under the project's open source license. Whether or not you state this explicitly, by submitting any copyrighted material via pull request, email, or other means you agree to license the material under the project's open source license and warrant that you have the legal authority to do so.

License

This code is open source software licensed under the Apache-2.0 license.

Allysh0w / akkounts