Pani

Deprecation Warning: A fork of this project is under active development here: https://github.com/crisptrutski/matchbox .The future of pani itself is undecided at this time.

A convenience library to access Firebase from Clojurescript.

The goal of this library is not to provide access to the entire functionality offered by Firebase, but to make it convenient to use Firebase as a data store from within Clojurescript.

Current version

The library is in its infancy. The current version is 0.0.3.

Features

Pani offers several benefits over raw JS interop:

• Idiomatic constructs
• Async channels or callbacks for change notifications
• Javascript objects abstraction

This library, for now, is entirely based on how I intend to use this library (may be with Om etc.) and would grow as I discover more things I'd like it to do. Pull requests welcome!

Usage

Require pani:

(:require [pani.cljs.core :as p])       ; for clojurescript
(:require [pani.clojure.core :as p])    ; for clojure

Create a root object:

(def r (p/root "https://your-app.firebaseio.com/"))

Bind a callback to recieve callback notifications when a value notification occurs:

(p/bind r :value :age #(log %1))

The bind call accepts either a key or a seq of keys (get-in style):

(p/bind r :value [:info :world] #(log %1))

You can also bind to other Firebase notification events, e.g. the child_added notification:

(p/bind r :child_added :messages #(log %1))

If no callback is specified, the bind call returns an async channel:

(let [c (p/bind r :child_added :messages)]
  (go-loop [msg (<! c)]
    (.log js/console "New message (go-loop):" (:message msg))
    (recur (<! c))))

Use the set! call to set a value, like bind this function accepts either a single key or a seq of keys:

(p/set! r [:info :world] "welcome")
(p/set! r :age 100)

Use the push! function to push values into a collection:

(p/push! r :messages {:message "hello"})

Finally, use the walk-root function to get a new child node:

(def messages-root (p/walk-root r :messages))
(p/bind messages-root :child_added [] #(log %1))

Clojurescript Examples

Note that, most examples will require you to add your Firebase app url to the example. You'd most likely have to edit a line like the following in one of the source files (most likely core.cljs):

;; TODO: Set this to a firebase app URL
(def firebase-app-url "https://your-app.firebaseio.com/")

All examples are available under the examples directory. To run a Clojurescript example just run the respective lein command to build it:

lein cljsbuild once <example-name>

This should build and place a main.js file along with an out directory in the example's directory. You should now be able to go to the example's directory and open the index.html file in a web-browser.

License

Copyright © 2014 Uday Verma

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.