Serverless Vertx API

A Java VERT.X based Serverless API Gateway/Lambda template for establishing an API Gateway proxy and lambda handler that can:

• Fetch data from a remote web source
• Parse and extract the fetched data
• Insert the extracted data into a database
• Additionally, expose an API that allows for requests to get the data from a database

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General Processing Flow

1. ServiceLauncher started, creates verticles for each of the core handlers.
2. ServiceLauncher exposes an handleRequest override method, which recieves the incoming APIGateway request.
3. The handleRequest starts a CompletableFuture, that encapsulates a send of the incoming API resource data to the Vertx event message bus.
4. The EventHubVerticle is the main verticle listening for incoming URI event requests, using several event.consumer definitions to handle the respective URI request.
5. Various other Verticles are used (some in an execute blocking fashion if they may be long running - ie. remote data requests, db inserts, etc.)
6. Ultimately, each consumer in the EventHubVerticle creates a reply, which is relayed back to the ServiceLauncher's handleRequest method.
7. The handleRequest future is marked complete, and an APIGatewayReply is provided back to the user.

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Compile using:

mvn clean compile

Package fat jar using:

mvn package

Deploy to API Gateway

serverless deploy

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CREDITS: This app is modeled after a few Github examples:

• https://github.com/serverless/examples/tree/master/aws-java-simple-http-endpoint
• https://github.com/pendula95/aws-java-maven-vertx