Clojure on Heroku

gistfile1.txt

~/$ lein new ring-on-heroku
Created new project in: /home/jim/Development/ring-on-heroku
~/$ cd ring-on-heroku
~/ring-on-heroku$ echo 'web: lein run -m ring-on-heroku.core' > Procfile
~/ring-on-heroku$ cat > src/ring_on_heroku/core.clj 
(ns ring-on-heroku.core
  (:use ring.util.response
        ring.adapter.jetty))

(defn app [req]
  (response "Hello World"))

(defn -main []
  (let [port (Integer/parseInt (get (System/getenv) "PORT" "8080"))]
    (run-jetty app {:port port})))

~/ring-on-heroku$ cat > project.clj
(defproject ring-on-heroku "1.0.0-SNAPSHOT"
  :description "Example Ring app running on Heroku"
  :dependencies [[org.clojure/clojure "1.2.1"]
                 [ring/ring-core "0.3.8"]
                 [ring/ring-jetty-adapter "0.3.8"]])

~/ring-on-heroku$ git init
Initialized empty Git repository in /home/jim/Development/ring-on-heroku/.git/
~/ring-on-heroku$ git add .
~/ring-on-heroku$ git commit -m "Initial commit"
[master (root-commit) c09dde7] Initial commit
 6 files changed, 40 insertions(+), 0 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 Procfile
 create mode 100644 README
 create mode 100644 project.clj
 create mode 100644 src/ring_on_heroku/core.clj
 create mode 100644 test/ring_on_heroku/test/core.clj
~/ring-on-heroku$ heroku create --stack cedar
Creating fierce-fog-647... done
http://fierce-fog-647.heroku.com/ | git@heroku.com:fierce-fog-647.git
Git remote heroku added
~/ring-on-heroku$ git push heroku master
Warning: Permanently added the RSA host key for IP address '50.19.85.156' to the list of known hosts.
Counting objects: 13, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (6/6), done.
Writing objects: 100% (13/13), 1.30 KiB, done.
Total 13 (delta 0), reused 0 (delta 0)

-----> Heroku receiving push
-----> Clojure app detected
-----> Installing Leiningen
       Downloading: leiningen-1.5.2-standalone.jar
       Writing: lein script
-----> Installing dependencies with Leiningen
       Running: lein deps :skip-dev
       Downloading: org/clojure/clojure/1.2.1/clojure-1.2.1.pom from central
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       Transferring 2K from clojars
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       Transferring 2K from clojars
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       Transferring 16K from clojars
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       Copying 11 files to /tmp/build_3fg55ekdqxz4k/lib
-----> Discovering process types
       Procfile declares types -> web
-----> Compiled slug size is 11.0MB
-----> Launching... done, v4
       http://fierce-fog-647.herokuapp.com deployed to Heroku

To git@heroku.com:fierce-fog-647.git
 * [new branch]      master -> master

Had to explicitly add the PORT env var:

$ heroku config:add PORT=8080

Otherwise, kick-ass.

EDIT:

Yeah, I was off. Jetty needs to bind to a dynamically assigned port, which Heroku puts in the PORT env variable.

This is going to be HUGE!

zkim, I had to remove the PORT env var in order to get it to work.

My code is more or less verbatim, but IIRC I made a small change or two. I'll push my skeleton project soon-ish.