scala-aws-params-reader's Introduction

Scala AWS Params Reader

What?

A library that lets you read data from AWS' EC2 Systems Manager Parameter Store in a Scala-friendly way. It supports reading data in AWS' three formats - String, StringList, and SecureString - implicitly into Scala types.

Huh?

Example

  
package io.policarp.scala

import com.amazonaws.auth.DefaultAWSCredentialsProviderChain
import com.amazonaws.services.simplesystemsmanagement.AWSSimpleSystemsManagementClientBuilder
import io.policarp.scala.aws.params.reader.ParamReader
import io.policarp.scala.aws.params.reader.ListWriter._

object Test extends App {

  val client = AWSSimpleSystemsManagementClientBuilder.standard().withCredentials(new DefaultAWSCredentialsProviderChain()).build()
  val params = ParamReader(client)
  
  println(params.read[Long]("length"))
  // Right(42)
  
  println(params.readList[Long]("length"))
  // Left(InvalidParam(length)) because 'length' is actually a single parameter
  
  println(params.readList[String]("names"))
  // Right(List(Grayson,Jemma)))
  
  println(params.readList[String]("emails", listSeparator = Semicolon))
  // Right(List([email protected],[email protected])))  
  
  println(params.readSecure[String]("mysecret"))
  // Right(hunter2), where data is decrypted using Amazon's Key Management Service if your credentials allow for it
  
  println(params.readSecure[String]("yoursecret"))
  // Left(InvalidParam(yoursecret)) because 'yoursecret' does not exist OR your credentials don't allow for reading
}

Other Types?

Simply provide an implementation of the trait ValueWriter. It's basically:

String => ParamResult[A],
where ParamResult is an alias to Either[InvalidParam[A], A], and
InvalidParam is simply a case class wrapping the name of the invalid parameter.

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