zefhemel/denorunner

Deno "lambda" runner

Simple way to run a lambda-like function using Deno as a sub-process of a Go program.

Functions are written in plain JavaScript and executed using Deno.

At the bare minimum the JavaScript code should define a handle function taking an event object (JSON). Optionally, an init function can be defined that is invoked upon cold start with arbitrary configurable (JSON) data. Debug data can be logged using console.log and will be passed to a logging callback.

Most basic function definition returning event data back unmodified and logging the event:

function handle(event) {
    console.log("Got event", event);
    return event;
}

Example of using the init block for cold starts:

let token;

function init(cfg) {
	token = cfg.token;
	console.log("Inited");
}

function handle(event) {
	console.log("Invoked with", event);
	return {token: token, name: event.name};
}

The init will be invoked upon function boot (which happens when creating the function instance with the NewDenoFunctionInstance API). Every invocation (.Invoke) will run the handle function.

See deno_test.go for examples of usage. Run tests with:

go test