quick and dirty bittrex client in ruby that spits market data to graphite

bittrex.rb

require 'rubygems'
require 'faraday'
require 'oj'
require 'openssl'
require 'base64'
require 'digest/md5'
require 'ostruct'
require 'pry'

API_HOST = 'https://bittrex.com'
API_VERSION = 'v1.1'
API_NAMESPACE = "api/#{ API_VERSION }"

CONFIG = OpenStruct.new(
  :api_key => API_KEY,      # PUT YOUR API KEY
  :api_secret => API_SECRET,# PUT YOUR SECRET
  :version => API_VERSION
)

class BittrexMiddleware < Faraday::Middleware
  attr_accessor :config

  def initialize( app, config=nil )
    super app

    @config = config
  end

  def call(env)
    signature = self.class.sign( @config.api_secret, self.class.string_to_sign(@config.api_key, env) )

    env[:request_headers]['apisign'] = signature

    env[:request_headers]['User-Agent'] = 'Ruby Bittrex Client'

    @app.call(env)
  end

  def self.string_to_sign( api_key, env )
    path   = "#{ env[:url].scheme }://#{ env[:url].host }#{ env[:url].request_uri }"
    nonce = Time.now.to_i

    "#{ path }?apikey=#{ api_key }&nonce=#{ nonce }"
  end

  def self.sign( secret, string_to_sign )
    Base64.encode64 OpenSSL::HMAC.digest(
      OpenSSL::Digest::Digest.new('sha512'),
      secret,
      string_to_sign
    )
  end
end

CLIENT = Faraday.new( :url => "#{ API_HOST }/api/#{ API_VERSION }" ) do |f|
  f.use BittrexMiddleware, CONFIG

  f.adapter :net_http
end

def make_request( method )

  response = CLIENT.get( method )

  raise "error: #{ response.status }" unless response.success?

  data = Oj.load( response.body )

end

summaries = make_request('public/getmarketsummaries')

summaries['result'].each do |market|
  name = market['MarketName']
  fields = %w( High Low Volume Last BaseVolume Bid Ask OpenBuyOrders OpenSellOrders PrevDay )
  fields.each do |field|
    next if market[field].nil?
    value = "%f" % market[field]
    puts "coin.market.bittrex.#{ name }.#{ field } #{ value } #{ Time.now.to_i }"
  end
end