Class: CoinTools::CoinMarketCap

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

Defined Under Namespace

Classes: BadRequestException, DataPoint, InvalidDateException, InvalidFiatCurrencyException, InvalidResponseException, NoDataException

Constant Summary collapse

BASE_URL = 
"https://api.coinmarketcap.com"
USER_AGENT = 
"cointools/#{CoinTools::VERSION}"
FIAT_CURRENCIES = 
[
  'AUD', 'BRL', 'CAD', 'CHF', 'CLP', 'CNY', 'CZK', 'DKK', 'EUR', 'GBP',
  'HKD', 'HUF', 'IDR', 'ILS', 'INR', 'JPY', 'KRW', 'MXN', 'MYR', 'NOK',
  'NZD', 'PHP', 'PKR', 'PLN', 'RUB', 'SEK', 'SGD', 'THB', 'TRY', 'TWD',
  'ZAR'
]

Instance Method Summary collapse

Instance Method Details

#get_price(coin_name, convert_to: nil) ⇒ Object 



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# File 'lib/cointools/coinmarketcap.rb', line 51

def get_price(coin_name, convert_to: nil)
  url = URI("#{BASE_URL}/v1/ticker/#{coin_name}/")

  if convert_to
    validate_fiat_currency(convert_to)
    url += "?convert=#{convert_to}"
  end

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    record = json[0]

    usd_price = record['price_usd']&.to_f
    btc_price = record['price_btc']&.to_f
    timestamp = Time.at(record['last_updated'].to_i)

    if convert_to
      converted_price = record["price_#{convert_to.downcase}"]&.to_f
      raise NoDataException.new('Conversion to chosen fiat currency failed') if converted_price.nil?
    end

    return DataPoint.new(timestamp, usd_price, btc_price, converted_price)
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise InvalidResponseException.new(response)
  end
end

#get_price_by_symbol(coin_symbol, convert_to: nil) ⇒ Object 



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# File 'lib/cointools/coinmarketcap.rb', line 83

def get_price_by_symbol(coin_symbol, convert_to: nil)
  url = URI("#{BASE_URL}/v1/ticker/?limit=0")
  symbol = coin_symbol.downcase

  if convert_to
    validate_fiat_currency(convert_to)
    url += "&convert=#{convert_to}"
  end

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    record = json.detect { |r| r['symbol'].downcase == symbol }
    raise NoDataException.new('No coin found with given symbol') if record.nil?

    usd_price = record['price_usd']&.to_f
    btc_price = record['price_btc']&.to_f
    timestamp = Time.at(record['last_updated'].to_i)

    if convert_to
      converted_price = record["price_#{convert_to.downcase}"]&.to_f
      raise NoDataException.new('Conversion to chosen fiat currency failed') if converted_price.nil?
    end

    return DataPoint.new(timestamp, usd_price, btc_price, converted_price)
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise Exception.new(response)
  end
end