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require 'concurrent'
require 'csv'
require 'open-uri'
class Ticker
def get_year_end_closing(symbol, year, api_key)
uri = "https://www.alphavantage.co/query?function=TIME_SERIES_MONTHLY&symbol=#{symbol}&apikey=#{api_key}&datatype=csv"
data = []
csv = URI.parse(uri).read
if csv.include?('call frequency')
return :rate_limit_exceeded
end
CSV.parse(csv, headers: true) do |row|
data << row['close'].to_f if row['timestamp'].include?(year.to_s)
end
year_end = data.first
year_end
rescue => e
p e
end
end
api_key = ENV['ALPHAVANTAGE_KEY']
abort(error_message) unless api_key
# Future
price = Concurrent::Future.execute{ Ticker.new.get_year_end_closing('TWTR', 2013, api_key) }
p price.state #=> :pending
p price.pending? #=> true
p price.value(0) #=> nil (does not block)
sleep(1) # do other stuff
p price.value #=> 63.65 (after blocking if necessary)
p price.state #=> :fulfilled
p price.fulfilled? #=> true
p price.value #=> 63.65
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