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require 'sinatra'
require 'sprockets'
require 'sinatra/content_for'
require 'rufus/scheduler'
require 'coffee-script'
require 'sass'
require 'json'
require 'yaml'
require 'thin'
SCHEDULER = Rufus::Scheduler.new
def development?
ENV['RACK_ENV'] == 'development'
end
def production?
ENV['RACK_ENV'] == 'production'
end
helpers Sinatra::ContentFor
helpers do
def protected!
# override with auth logic
end
end
set :root, Dir.pwd
set :sprockets, Sprockets::Environment.new(settings.root)
set :assets_prefix, '/assets'
set :digest_assets, false
set server: 'thin', connections: [], history_file: 'history.yml'
set :public_folder, File.join(settings.root, 'public')
set :views, File.join(settings.root, 'dashboards')
set :default_dashboard, nil
set :auth_token, nil
if File.exists?(settings.history_file)
set history: YAML.load_file(settings.history_file)
else
set history: {}
end
%w(javascripts stylesheets fonts images).each do |path|
settings.sprockets.append_path("assets/#{path}")
end
['widgets', File.expand_path('../../../javascripts', __FILE__)]. each do |path|
settings.sprockets.append_path(path)
end
not_found do
send_file File.join(settings.public_folder, '404.html')
end
at_exit do
File.write(settings.history_file, settings.history.to_yaml)
end
get '/' do
protected!
dashboard = settings.default_dashboard || first_dashboard
raise Exception.new('There are no dashboards available') if not dashboard
redirect "/" + dashboard
end
get '/events', provides: 'text/event-stream' do
protected!
response.headers['X-Accel-Buffering'] = 'no' # Disable buffering for nginx
stream :keep_open do |out|
settings.connections << out
out << latest_events
out.callback { settings.connections.delete(out) }
end
end
get '/:dashboard' do
protected!
tilt_html_engines.each do |suffix, _|
file = File.join(settings.views, "#{params[:dashboard]}.#{suffix}")
return render(suffix.to_sym, params[:dashboard].to_sym) if File.exist? file
end
halt 404
end
post '/dashboards/:id' do
request.body.rewind
body = JSON.parse(request.body.read)
body['dashboard'] ||= params['id']
auth_token = body.delete("auth_token")
if !settings.auth_token || settings.auth_token == auth_token
send_event(params['id'], body, 'dashboards')
204 # response without entity body
else
status 401
"Invalid API key\n"
end
end
post '/widgets/:id' do
request.body.rewind
body = JSON.parse(request.body.read)
auth_token = body.delete("auth_token")
if !settings.auth_token || settings.auth_token == auth_token
send_event(params['id'], body)
204 # response without entity body
else
status 401
"Invalid API key\n"
end
end
get '/views/:widget?.html' do
protected!
tilt_html_engines.each do |suffix, engines|
file = File.join(settings.root, "widgets", params[:widget], "#{params[:widget]}.#{suffix}")
return engines.first.new(file).render if File.exist? file
end
end
Thin::Server.class_eval do
def stop_with_connection_closing
Sinatra::Application.settings.connections.dup.each(&:close)
stop_without_connection_closing
end
alias_method :stop_without_connection_closing, :stop
alias_method :stop, :stop_with_connection_closing
end
def send_event(id, body, target=nil)
body[:id] = id
body[:updatedAt] ||= Time.now.to_i
event = format_event(body.to_json, target)
Sinatra::Application.settings.history[id] = event unless target == 'dashboards'
Sinatra::Application.settings.connections.each { |out| out << event }
end
def format_event(body, name=nil)
str = ""
str << "event: #{name}\n" if name
str << "data: #{body}\n\n"
end
def latest_events
settings.history.inject("") do |str, (id, body)|
str << body
end
end
def first_dashboard
files = Dir[File.join(settings.views, '*')].collect { |f| File.basename(f, '.*') }
files -= ['layout']
files.sort.first
end
def tilt_html_engines
Tilt.mappings.select do |_, engines|
default_mime_type = engines.first.default_mime_type
default_mime_type.nil? || default_mime_type == 'text/html'
end
end
def require_glob(relative_glob)
Dir[File.join(settings.root, relative_glob)].each do |file|
require file
end
end
settings_file = File.join(settings.root, 'config/settings.rb')
require settings_file if File.exists?(settings_file)
{}.to_json # Forces your json codec to initialize (in the event that it is lazily loaded). Does this before job threads start.
job_path = ENV["JOB_PATH"] || 'jobs'
require_glob(File.join('lib', '**', '*.rb'))
require_glob(File.join(job_path, '**', '*.rb'))
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