class CoinTools::CoinCap

Constants

BASE_URL
DataPoint
PERIODS

Public Instance Methods

get_current_price(symbol) click to toggle source
# File lib/cointools/coincap.rb, line 62
def get_current_price(symbol)
  raise InvalidSymbolError if symbol.to_s.empty?

  url = URI("#{BASE_URL}/page/#{symbol.upcase}")

  response = Request.get(url)

  case response
  when Net::HTTPSuccess
    json = Utils.parse_json(response.body)
    raise UnknownCoinError.new(response) if json.nil? || json.empty?
    raise JSONError.new(response) unless json.is_a?(Hash)

    usd_price = json['price_usd']
    eur_price = json['price_eur']
    btc_price = json['price_btc']

    if usd_price || eur_price || btc_price
      return DataPoint.new(time: nil, usd_price: usd_price, eur_price: eur_price, btc_price: btc_price)
    else
      raise NoDataError.new(response)
    end
  when Net::HTTPClientError
    raise BadRequestError.new(response)
  else
    raise ServiceUnavailableError.new(response)
  end
end
get_price(symbol, time = nil) click to toggle source
# File lib/cointools/coincap.rb, line 17
def get_price(symbol, time = nil)
  raise InvalidSymbolError if symbol.to_s.empty?

  if time.nil?
    return get_current_price(symbol)
  elsif time.is_a?(String)
    time = Utils.parse_time(time)
  end

  (time <= Time.now) or raise InvalidDateError.new('Future date was passed')
  (time.year >= 2009) or raise InvalidDateError.new('Too early date was passed')

  period = period_for_time(time)

  if period
    url = URI("#{BASE_URL}/history/#{period}day/#{symbol.upcase}")
  else
    url = URI("#{BASE_URL}/history/#{symbol.upcase}")
  end

  response = Request.get(url)

  case response
  when Net::HTTPSuccess
    json = Utils.parse_json(response.body)
    raise UnknownCoinError.new(response) if json.nil? || json.empty?
    raise JSONError.new(response) unless json.is_a?(Hash)

    data = json['price']
    raise JSONError.new(response) unless data.is_a?(Array)

    unixtime = time.to_i
    timestamp, price = best_matching_record(data, unixtime)
    raise NoDataError.new(response) if timestamp.nil? || price.nil?

    actual_time = Time.at(timestamp / 1000)

    return DataPoint.new(time: actual_time, usd_price: price, eur_price: nil, btc_price: nil)
  when Net::HTTPClientError
    raise BadRequestError.new(response)
  else
    raise ServiceUnavailableError.new(response)
  end
end

Private Instance Methods

best_matching_record(data, unixtime) click to toggle source
# File lib/cointools/coincap.rb, line 94
def best_matching_record(data, unixtime)
  millitime = unixtime * 1000
  data.sort_by { |record| (record[0] - millitime).abs }.first
end
period_for_time(time) click to toggle source
# File lib/cointools/coincap.rb, line 99
def period_for_time(time)
  now = Time.now

  PERIODS.map { |p| [p, now - p * 86400 + 7200] }.detect { |p, t| t < time }&.first
end