Class: CoinSync::PriceLoaders::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/coinsync/price_loaders/base.rb

Direct Known Subclasses

Cryptowatch

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Base

Returns a new instance of Base.



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# File 'lib/coinsync/price_loaders/base.rb', line 21

def initialize(options)
  @options = options
  @currency = currency
  @cache = Cache.new(cache_name)
end

Class Method Details

.register_price_loader(key) ⇒ Object 



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# File 'lib/coinsync/price_loaders/base.rb', line 13

def self.register_price_loader(key)
  if PriceLoaders.registered[key.to_sym]
    raise "Price loader has already been registered at '#{key}'"
  else
    PriceLoaders.registered[key.to_sym] = self
  end
end

Instance Method Details

#cache_name ⇒ Object 



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# File 'lib/coinsync/price_loaders/base.rb', line 27

def cache_name
  self.class.name.downcase.split('::').last
end

#convert_price(price) ⇒ Object 



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# File 'lib/coinsync/price_loaders/base.rb', line 47

def convert_price(price)
  case price
  when BigDecimal then price
  when String, Integer then BigDecimal.new(price)
  when Float then BigDecimal.new(price, 0)
  else raise "Unexpected price value: #{price.inspect}"
  end
end

#finalize ⇒ Object 



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# File 'lib/coinsync/price_loaders/base.rb', line 56

def finalize
  @cache.save
end

#get_price(coin, time) ⇒ Object 



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# File 'lib/coinsync/price_loaders/base.rb', line 31

def get_price(coin, time)
  (coin.is_a?(CryptoCurrency)) or raise "#{self.class}: 'coin' should be a CryptoCurrency"
  (time.is_a?(Time)) or raise "#{self.class}: 'time' should be a Time"

  data = @cache[coin, time]

  if data.nil?
    data = fetch_price(coin, time)
    @cache[coin, time] = data
  end

  price = data.is_a?(Array) ? data.first : data

  [convert_price(price), @currency]
end