Quick Start for a Server with Database in Scala

uses / includes

• akka-http as server-framework
• slick to access the database
• circe to serialize to JSON and back
• PostgreSQL as Database
• GitHub Actions and CircleCI definition for CI/CD
• Scalafmt for formatting
• a lot of sane, tried-and-tested defaults

Example usage

Spin up a PostgreSQL database, for example:

$ brew install postgresql
$ brew services start postgresql

Run sbt, then use reStart (from https://github.com/spray/sbt-revolver) to run it (without blocking the console):

$ sbt
[info] welcome to sbt 1.5.7 (Homebrew Java 11.0.12)
[info] loading global …
[info] …
[info] started sbt server

sbt:scala-start> reStart
[info] compiling 2 Scala sources...
[info] Application root not yet started
[info] Starting application root in the background ...
root Starting Main.main()
[success] Total time: 10 s
root [INFO ] Slf4jLogger started
root [INFO ] Server online at http://0:0:0:0:0:0:0:0:8080/

sbt:scala-start>

Talk to the server:

$ curl -X POST localhost:8080 -d '{"operation":"add","value1":12,"value2":13}' -H "content-type: application/json"
{"result":25}

$ curl -X POST localhost:8080 -d '{"operation":"multiply","value1":12,"value2":13}' -H "content-type: application/json"
{"result":156}

$ curl -X POST localhost:8080 -d '{"operation":"subtract","value1":12,"value2":13}' -H "content-type: application/json"
"Not suported"

$ curl localhost:8080 -s | jq
[
  {
    "timestamp": "2021-12-19T13:28:20.310609Z",
    "operation": "add",
    "value1": 12,
    "value2": 13,
    "result": "25"
  },
  {
    "timestamp": "2021-12-19T14:12:11.484108Z",
    "operation": "multiply",
    "value1": 12,
    "value2": 13,
    "result": "156"
  },
  {
    "timestamp": "2021-12-19T14:12:16.253103Z",
    "operation": "subtract",
    "value1": 12,
    "value2": 13,
    "result": "Not suported"
  }

Dependencies

This project is automatically updated by scala-steward) 🚀