Class: CoinTools::CoinCap

Inherits:
Object
  • Object
show all
Defined in:
lib/cointools/coincap.rb

Constant Summary collapse

BASE_URL = 
"https://coincap.io"
PERIODS = 
[1, 7, 30, 90, 180, 365]
DataPoint = 
BaseStruct.make(:time, :usd_price, :eur_price, :btc_price)

Instance Method Summary collapse

Instance Method Details

#get_current_price(symbol) ⇒ Object

Raises:



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# 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) ⇒ Object

Raises:



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# 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