Class: CoinTools::Cryptowatch

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

Defined Under Namespace

Classes: BadRequestException, DataPoint, InvalidDateException, InvalidResponseException, NoDataException

Constant Summary collapse

BASE_URL = 
"https://api.cryptowat.ch"
USER_AGENT = 
"cointools/#{CoinTools::VERSION}"
DAYS_FOR_PERIODS =

we expect this many days worth of data for a given period precision (in seconds); NOT guaranteed by the API

{
  60 => 3, 180 => 10, 300 => 15, 900 => 2 * 30, 1800 => 4 * 30, 3600 => 8 * 30,
  7200 => 365, 14400 => 1.5 * 365, 21600 => 2 * 365, 43200 => 3 * 365, 86400 => 4 * 365
}

Instance Method Summary collapse

Instance Method Details

#exchanges ⇒ Object 



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# File 'lib/cointools/cryptowatch.rb', line 38

def exchanges
  @exchanges ||= get_exchanges
end

#get_current_price(exchange, market) ⇒ Object 



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# File 'lib/cointools/cryptowatch.rb', line 88

def get_current_price(exchange, market)
  url = URI("#{BASE_URL}/markets/#{exchange}/#{market}/price")

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    price = json['result']['price']
    allowance = json['allowance']

    return DataPoint.new(price, nil, allowance['cost'], allowance['remaining'])
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise InvalidResponseException.new(response)
  end
end

#get_markets(exchange) ⇒ Object 



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# File 'lib/cointools/cryptowatch.rb', line 42

def get_markets(exchange)
  url = URI("#{BASE_URL}/markets/#{exchange}")

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    return json['result'].select { |m| m['active'] == true }.map { |m| m['pair'] }.sort
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise InvalidResponseException.new(response)
  end
end

#get_price(exchange, market, time = nil) ⇒ Object 



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# File 'lib/cointools/cryptowatch.rb', line 58

def get_price(exchange, market, time = nil)
  return get_current_price(exchange, market) if time.nil?

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

  unixtime = time.to_i
  current_time = Time.now.to_i
  url = URI("#{BASE_URL}/markets/#{exchange}/#{market}/ohlc?after=#{unixtime}")

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    data = json['result']
    allowance = json['allowance']

    timestamp, o, h, l, c, volume = best_matching_record(data, unixtime, current_time)
    raise NoDataException.new('No data found for a given time') if timestamp.nil?

    actual_time = Time.at(timestamp)
    return DataPoint.new(o, actual_time, allowance['cost'], allowance['remaining'])
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise InvalidResponseException.new(response)
  end
end

#get_price_fast(exchange, market, time) ⇒ Object 



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# File 'lib/cointools/cryptowatch.rb', line 107

def get_price_fast(exchange, market, time)
  (time <= Time.now) or raise InvalidDateException.new('Future date was passed')
  (time.year >= 2009) or raise InvalidDateException.new('Too early date was passed')

  period = precision_for_time(time)

  if period.nil?
    return get_price(exchange, market, time)
  end

  unixtime = time.to_i
  current_time = Time.now.to_i
  url = URI("#{BASE_URL}/markets/#{exchange}/#{market}/ohlc?after=#{unixtime}&periods=#{period}")

  response = make_request(url)

  case response
  when Net::HTTPSuccess
    json = JSON.load(response.body)
    data = json['result']
    allowance = json['allowance']

    timestamp, o, h, l, c, volume = best_matching_record(data, unixtime, current_time)
    raise NoDataException.new('No data found for a given time') if timestamp.nil?

    actual_time = Time.at(timestamp)
    return DataPoint.new(o, actual_time, allowance['cost'], allowance['remaining'])
  when Net::HTTPBadRequest
    raise BadRequestException.new(response)
  else
    raise InvalidResponseException.new(response)
  end
end