Corona-firebase

Library to work with Firebase databases in Corona SDK based apps

It utilize Firebase REST API to retrieve, add, change and delete data. Streaming API supported too.

Fast start

firebase = require('corona_firebase')
local db = firebase('https://corona.firebaseio.com/')
db:get("users", nil, function(event)
  if ( event.isError ) then
    print( "Network error!" )
  else
    print ( event.response )
  end
end)

Usage

main.lua file contains useful tests. Run it on Corona Emulator and look into console output to see what happening. It using https://corona.firebaseio.com/ DB for tests.

Methods

Importing library returns a db object. It mimics behaviour of Firebase REST API https://www.firebase.com/docs/rest/api/

firebase = require('corona_firebase')
local db = firebase('https://[YOUR_DB_ID_HERE].firebaseio.com/')

On a background network.request used from Corona SDK https://docs.coronalabs.com/api/library/network/request.html

get - reading data

db:get("[ENDPOINT]", "[QUERY]", function(event)
	if ( event.isError ) then
        -- Network error
    elseif ( event.phase == "began" ) then
        -- Request started, something useful may be in event.response
    elseif ( event.phase == "progress" ) then
        -- Request in progress
    elseif ( event.phase == "ended" ) then
        -- Finished, data should be in event.response
    end
end)

post - pushing data

db:post("[ENDPOINT]", '[JSON_DATA]', "[QUERY]", function(event)
    -- ..
end)

patch - updating data

db:patch("[ENDPOINT]", '[JSON_DATA]', "[QUERY]", function(event)
    -- ..
end)

put - writing data

db:put("[ENDPOINT]", '{"key": "value"}', "[QUERY]", function(event)
	-- ..
end)

delete - removing data

db:delete("[ENDPOINT]", "[QUERY]", function(event)
	-- ..
end)

Streaming

on - subscribing on live data updates

db:on("[ENDPOINT]", "[QUERY]", function( data )
    print("Got data!")
    print(data)
end)

EventSource / Server-Sent Events protocol used here. Client's Accept header is set to text/event-stream. Every time ''data'' changed on server your application will receive a notification. Timeout errors handled as well.

Firebase docs on it: https://www.firebase.com/docs/rest/api/#section-streaming

Query Parameters

Every method accepts query string to pass additional query to Firebase REST API. It accepts fololwing parameters and values: https://www.firebase.com/docs/rest/api/#section-query-parameters

db:get("users", "?auth=CREDENTIAL", function(event)
    -- ..
end)