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46 lines
923 B
46 lines
923 B
#!/usr/bin/env ruby
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require 'uri'
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require 'net/http'
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require 'json'
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class CPIFetcher
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DEFAULT_CPI_SERIES_URL = 'http://api.bls.gov/publicAPI/v2/timeseries/data/CUUSA210SA0'.freeze
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attr_reader :url, :bls_token
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def initialize
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@url = URI(ENV['CPI_SERIES_URL'] || DEFAULT_CPI_SERIES_URL)
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@bls_token = ENV.fetch('BLS_TOKEN')
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end
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def cpi
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resp = fetch_raw_response
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return nil unless resp['Results']['series']
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data = resp['Results']['series'].first['data']
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data.sort! { |a, b| a['year'] <=> b['year'] }
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data.last['value']
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end
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private
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def fetch_raw_response
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res = Net::HTTP.start(url.hostname, url.port) do |http|
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http.request(build_request)
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end
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JSON.parse(res.body)
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end
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def build_request
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req = Net::HTTP::Get.new(url)
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req['Authorization'] = "token #{bls_token}"
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req
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end
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end
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if $PROGRAM_NAME == __FILE__
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puts CPIFetcher.new.cpi
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exit 0
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end
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