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52 lines
1.2 KiB
52 lines
1.2 KiB
# frozen_string_literal: true
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require 'json'
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require 'net/http'
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require 'net/https'
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require 'uri'
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class CPIFetcher
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DEFAULT_CPI_SERIES_URL = File.join(
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'https://api.bls.gov',
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'publicAPI/v2/timeseries/data/CUUSA210SA0'
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)
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private_constant :DEFAULT_CPI_SERIES_URL
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attr_reader :url, :bls_token
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private :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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last_cpi_value(resp['Results']['series'].first['data'])
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end
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private def last_cpi_value(data)
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data
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.sort { |a, b| a['year'] <=> b['year'] }
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.then { |d| d.last['value'] }
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end
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private def fetch_raw_response
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Net::HTTP.new(url.hostname, url.port)
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.tap { |h| h.use_ssl = true }
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.tap { |h| h.verify_mode = OpenSSL::SSL::VERIFY_PEER }
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.then { |h| JSON.parse(h.request(build_request).body) }
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end
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private def build_request
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Net::HTTP::Get.new(url)
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.tap { |r| r['Authorization'] = "token #{bls_token}" }
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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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