Functions Framework for Dart

DISCLAIMER: This is not ready for production. Expect breaking changes. We're sharing our progress with the developer community and appreciate your feedback. Feel free to start a discussion to share thoughts or open issues for bugs.

Functions Framework	Unit Tests	Lint Test	Conformance Tests
Dart

An open source FaaS (Function as a Service) framework for writing portable Dart functions, brought to you by the Google Dart and Cloud Functions teams.

The Functions Framework lets you write lightweight functions that run in many different environments, including:

• Your local development machine
• Google Cloud Run - see quickstart
• Google App Engine
• Knative-based environments

Google Cloud Functions does not currently provide an officially supported Dart language runtime, but we're working to make running on Google Cloud Run as seamless and symmetric an experience as possible for your Dart Functions Framework projects.

The framework allows you to go from:

examples/hello/lib/functions.dart

import 'package:functions_framework/functions_framework.dart';
import 'package:shelf/shelf.dart';

@CloudFunction()
Response function(Request request) => Response.ok('Hello, World!');

To:

curl https://<your-app-url>
# Output: Hello, World!

All without needing to worry about writing an HTTP server or request handling logic.

See more demos under the examples directory.

Features

• Build your Function in the same container environment used by Cloud Functions using buildpacks
• Invoke a function in response to a request
• Automatically unmarshal events conforming to the CloudEvents spec
• Portable between serverless platforms

Quickstart

Dart quickstart on your local machine.

$ cd examples/hello
$ docker build -t app .
...

$ docker run -it -p 8080:8080 --name demo --rm app
Listening on :8080

In another terminal...

$ curl localhost:8080
Hello, World!

See more quickstarts.

Contributing changes

See CONTRIBUTING.md for details on how to contribute to this project, including how to build and test your changes as well as how to properly format your code.

Licensing

Apache 2.0; see LICENSE for details.