This project provides adapters to different cloud providers allowing developers to write Kotlin functions that are not tied to any specific cloud vendor.
Although it is highly inspired on the amazing Spring Cloud Function, this project is far from providing anything even close to the functionality provided by the Spring project. This is simply an idea that may fly with others one day
I took a lot of liberty on using Kodein as the DI framework for the project, many of the decisions I made may not be the best, and hopefuly someone will correct it via a PR :)
In order to use the project you must first import it on your pom:
<dependency>
<groupId>io.igx.kotlin.cloud.functions</groupId>
<artifactId>kodein-cloud-functions-aws-adapter</artifactId>
</dependency>The project uses java ServiceLoader mechanism to find Kodein modules on the classpath. You need to create a class that implements io.igx.kotlin.cloud.functions.ModuleLoader
such as
class SampleModuleLoader : ModuleLoader {
override fun getModules(): List<Kodein.Module> {
val module = Kodein.Module("samples") {
bind<Function1<Foo, Bar>>(tag = "fooBar") with singleton { FooBar() } (1)
bind(tag ="reqRes") from singleton { {r:Request -> Response(200)} } (2)
}
return listOf(module)
}
}-
Binding a top level class such as
class FooBar : (Foo) → (Bar) { -
Binding of a high level function, no type declared
And as with any ServiceLoader implementation you need to create a file named META-INF/services/io.igx.kotlin.cloud.functions.ModuleLoader with the name of
all the ServiceLoader implementations you have.
That’s pretty much all it takes, no dependency on the cloud provider contract.
On AWS when deploying make sure you set the Handler to io.igx.kotlin.cloud.functions.aws.KodeinStreamHandler and that you set a FUNCTION_NAME environment variable
to match the tag attribute of your bind