Heroku Buildpack: Dart

This is a Heroku buildpack for Dart.

This buildpack requires that you use the Cedar-14 (Ubuntu 14.x-based) stack for your Heroku application. If your Heroku app runs on previous versions of Cedar, see below for more info.

Features

• Runs Dart VM as a server in Heroku's cloud
• Installs packages with pub
• Builds the client app with pub build
• Cedar 14 (Ubuntu 14) required

Running on Cedar-10 ?

This buildpack only supports Heroku applications that are running on the Cedar-14 stack. If your application is running on Cedar-10, you should first migrate to Cedar-14.

This buildpack should work with Cedar-10, but the developers of this buildpack do not support Cedar-10.

The Cedar-10 stack on Heroku does not support the Dart SDK by default due to mismatched glibc versions. If you must remain on the Cedar-10 stack, you need to provide your own .tar.gz of Dart SDK compiled for Ubuntu 10.04 (Heroku's Cedar stack). Get instructions for building Dart for Ubuntu 10.04 or you can try using an (unsupported) community build of Dart for Ubuntu 10.04.

Getting Started

(These instructions assume you have the heroku tools and git installed, and that you have a heroku account.)

Create a Heroku app with the cedar-14 stack, specify both this buildpack and a URL that points to a compiled Dart SDK.

Here is a set of commands that deploys a minimal HTTP server built with Dart to Heroku:

$> git clone https://github.com/igrigorik/heroku-buildpack-dart.git
$> mkdir myfirstdartappforheroku
$> cp -R heroku-buildpack-dart/test-app/* myfirstdartappforheroku
$> cd myfirstdartappforheroku
$> git init
$> git add -A .
$> git commit -am "first commit"
$> heroku create myfirstdartappforheroku -s cedar-14
$> heroku config:set DART_SDK_URL=<archive url>
$> heroku config:add BUILDPACK_URL=https://github.com/igrigorik/heroku-buildpack-dart.git

Push the app to Heroku. Learn more about deploying to Heroku with git.

$> git push heroku master

Example output from a git push:

Initializing repository, done.
Counting objects: 11, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (11/11), done.
Writing objects: 100% (11/11), 2.27 KiB | 0 bytes/s, done.
Total 11 (delta 0), reused 0 (delta 0)

-----> Fetching custom git buildpack... done
-----> Dart app detected
-----> Welcome, this machine is: Linux 4d4ac1e0-412c-4734-9a68-0e0002f669cf 3.8.11-ec2 #1 SMP Fri May 3 09:11:15 UTC 2013 x86_64 GNU/Linux
-----> Installing Dart VM via URL https://www.dropbox.com/s/y1eq2rkc8j7nyek/dart-sdk-v1.1.0-dev.4.0.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10.3M  100 10.3M    0     0  5822k      0  0:00:01  0:00:01 --:--:-- 13.4M
-----> Copy Dart binaries to app root
-----> Dart cmd found at -rwx------ 1 u13180 13180 10064032 Dec 22 19:23 /app/dart-sdk/bin/dart
Dart VM version: 1.1.0-dev.4.0 (Mon Dec 16 12:29:42 2013) on "linux_x64"
-----> Dart reports version: 
*** Found pubspec.yaml in /tmp/build_c4247abc-3094-495f-870d-4e72fe1f1f36/.
*** Running pub get
Resolving dependencies.......
Downloading browser 0.9.0...
Downloading http_server 0.9.1...
Downloading mime 0.9.0...
Downloading path 1.0.0...
Got dependencies!
*** Running pub build
Building basic_http_server.......
[Info in Dart2JS]:
Took 0:00:06.587561 to compile basic_http_server|web/index.dart.
Built 8 files!
total
-----> Discovering process types
       Procfile declares types -> (none)

-----> Compressing... done, 10.5MB
-----> Launching... done, v6
       http://myfirstdartappforheroku.herokuapp.com deployed to Heroku

To git@heroku.com:myfirstdartapp2.git
 * [new branch]      master -> master

You may need to scale to one web dyno (aka server):

$> heroku ps:scale web=1

Test your app! The URL is printed at the end of the git push step.

Configuration

Location of Dart SDK

You must specify a URL that points to a .zip that contains the Dart SDK. Links to Dart SDKs built for Linux are available.

$> heroku config:set DART_SDK_URL=<archive url>

If you are still running on Cedar-10, you will need to build your own Dart SDK using the instructions for building Dart SDK for Ubuntu 10.04.

Specifying the script

The Procfile defines the file to run when the application starts. We recommend to put the server script into your application's bin/ directory.

The sample app's Procfile looks like:

web: ./dart-sdk/bin/dart bin/basic_http_server.dart

Overriding the build command

By default pub build is launched after pub get, it can be useful to use another command: for instance pub build --mode=debug or /app/dart-sdk/bin/dart build.dart:

$> heroku config:set DART_BUILD_CMD="/app/dart-sdk/bin/dart build.dart"

Example

See test-app directory for the world simplest Dart web app running on Heroku.

Learning more

Dart VM can access files, directories, sockets, HTTP, web sockets, SSL, and more. See the dart:io library for core functionality.

Dart's package repository, pub, hosts lots of options for more functionality, such as database drivers, HTTP server frameworks, templates, and more.

License

The MIT License - Copyright (c) 2012 Ilya Grigorik