74 lines
2.3 KiB
Ruby
74 lines
2.3 KiB
Ruby
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# frozen_string_literal: true
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require "net/http"
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require "oj"
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require "provider/adapters/adapter"
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class Provider
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module Adapters
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# National Bank of the Republic of Belarus. Publishes daily rates for ~30 currencies against BYN.
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# BYN was redenominated on 2016-07-01; earlier data uses different currency IDs.
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class NBRB < Adapter
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RATES_URL = "https://api.nbrb.by/exrates/rates"
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CHUNK_DAYS = 365
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def fetch(after: nil, upto: nil)
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currencies = current_currencies
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currencies.flat_map do |cur_id, iso, scale|
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chunked_dynamics(cur_id, iso, scale, after, upto || Date.today)
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end
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end
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private
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def parse_daily(data)
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data.filter_map do |row|
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date = Date.parse(row.fetch("Date"))
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next if date.saturday? || date.sunday?
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iso = row.fetch("Cur_Abbreviation")
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scale = Integer(row.fetch("Cur_Scale"))
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rate = Float(row.fetch("Cur_OfficialRate"))
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next if scale.zero?
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{ date:, base: iso, quote: "BYN", rate: rate / scale }
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end
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end
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def current_currencies
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data = Oj.load(Net::HTTP.get(URI("#{RATES_URL}?periodicity=0")), mode: :strict)
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data.map { |row| [row.fetch("Cur_ID"), row.fetch("Cur_Abbreviation"), Integer(row.fetch("Cur_Scale"))] }
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end
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def chunked_dynamics(cur_id, iso, scale, start_date, end_date)
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records = []
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chunk_start = start_date
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while chunk_start <= end_date
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chunk_end = [chunk_start + CHUNK_DAYS - 1, end_date].min
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records.concat(fetch_dynamics(cur_id, iso, scale, chunk_start, chunk_end))
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chunk_start = chunk_end + 1
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end
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records
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end
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def fetch_dynamics(cur_id, iso, scale, start_date, end_date)
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url = URI("#{RATES_URL}/dynamics/#{cur_id}")
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url.query = URI.encode_www_form(startDate: start_date.to_s, endDate: end_date.to_s)
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data = Oj.load(Net::HTTP.get(url), mode: :strict)
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return [] unless data.is_a?(Array)
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data.filter_map do |row|
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date = Date.parse(row.fetch("Date"))
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next if date.saturday? || date.sunday?
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rate = Float(row.fetch("Cur_OfficialRate"))
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{ date:, base: iso, quote: "BYN", rate: rate / scale }
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end
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end
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end
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end
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end
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