5622a9e2cb
It didn't really make any sense to have custom conditions that depend on the presence or absence of beans of type Function, Supplier, Consumer because the actual endpoints are derived from the FunctionCatalog (which might not be based on bean definitions). This approach is far simpler, and reduces the amount of custom code in the stream binder. The spring.cloud.function.stream.supplier.enabled flag is awkward, so we should try and find a way to avoid that. There's also no reason it should need to be set in the deployer tests.
Spring Cloud Function Deployer is an app that can deploy functions packaged as jars. Once the app is running it can deploy a basic Spring Cloud Function app from a jar with locally cached dependencies in about 500ms (compared to 1500ms for the same application launched from cold). It can be used in a pool as a "warm" JVM to deploy functions quicker than they could be started from scratch.
The app has a single endpoint called "/admin" that you can use to manage the deployed functions. You GET from it to list the deployed apps, POST to /{name} to deploy a named app with a path parameter pointing to a jar resource, and then DELETE /{name} to remove it. Functions in the apps are exposed as /{name}/{function} with the usual conventions for Spring Cloud Function (i.e. the function name is the bean name by default).
== Running the Deployer
Run the main class ApplicationRunner in this project (from the command line or in the IDE). E.g.
$ ./mvnw install -DskipTests
$ cd spring-cloud-function-deployer
$ ../mvnw spring-boot:run
The app starts empty, so the admin resource shows no deployed apps:
$ curl localhost:8080/admin
{}
Deploy a sample like this:
$ curl localhost:8080/admin/pojos -d path=maven://com.example:function-sample-pojo:1.0.0.BUILD-SNAPSHOT
{"id":"81c568e36c7909ec1dd841aa7ee6d3e3"}
(takes about 500ms, once the local Maven cache is warm). Deploy another one:
$ curl localhost:8080/admin/sample -d path=maven://com.example:function-sample:1.0.0.BUILD-SNAPSHOT
{"id":"cb2fdb3130f6349f143f4686848ea90f"}
Undeploy the first one:
$ curl localhost:8080/admin/pojos -X DELETE
{"name":"81c568e36c7909ec1dd841aa7ee6d3e3","id":"pojos","path":"maven://com.example:function-sample-pojo:1.0.0.BUILD-SNAPSHOT"}
List the deployed apps:
$ curl localhost:8080/admin
{"sample":{"name":"sample","id":"cb2fdb3130f6349f143f4686848ea90","path":"maven://com.example:function-sample:1.0.0.BUILD-SNAPSHOT"}}
Send an event to one of the functions:
$ curl -H "Content-Type: text/plain" localhost:8080/sample/uppercase -d foo
FOO