67 lines
1.9 KiB
Ruby
67 lines
1.9 KiB
Ruby
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# frozen_string_literal: true
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require "json"
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require "net/http"
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require "provider/adapters/adapter"
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class Provider
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module Adapters
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# Banco Central do Brasil. Fetches daily PTAX closing exchange rates for 10
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# currencies against the Brazilian real (BRL) via the PTAX OData API.
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# The PTAX system only publishes these 10 currencies.
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class BCB < Adapter
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API_URL = "https://olinda.bcb.gov.br/olinda/servico/PTAX/versao/v1/odata/" \
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"CotacaoMoedaPeriodo(moeda=@moeda,dataInicial=@dataInicial,dataFinalCotacao=@dataFinalCotacao)"
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CURRENCIES = ["AUD", "CAD", "CHF", "DKK", "EUR", "GBP", "JPY", "NOK", "SEK", "USD"].freeze
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def fetch(after: nil, upto: nil)
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dataset = []
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date_from = Date.parse(after.to_s)
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date_upto = Date.parse((upto || Date.today).to_s)
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CURRENCIES.each do |currency|
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sleep(0.2)
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dataset.concat(fetch_currency(currency, date_from, date_upto))
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end
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dataset
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end
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def parse(json, currency)
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data = JSON.parse(json)
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records = data["value"] || []
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records.filter_map do |record|
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rate = record["cotacaoVenda"]
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next unless rate
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next if rate.zero?
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raw_date = record["dataHoraCotacao"].to_s.strip[0, 10]
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next unless raw_date&.length == 10
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date = Date.strptime(raw_date, "%Y-%m-%d")
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{ date:, base: currency, quote: "BRL", rate: }
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end
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end
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private
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def fetch_currency(currency, date_from, date_upto)
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query = [
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"@moeda='#{currency}'",
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"@dataInicial='#{date_from.strftime("%m-%d-%Y")}'",
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"@dataFinalCotacao='#{date_upto.strftime("%m-%d-%Y")}'",
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"$filter=tipoBoletim%20eq%20'Fechamento'",
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"$format=json",
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].join("&")
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url = URI("#{API_URL}?#{query}")
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response = Net::HTTP.get(url)
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parse(response, currency)
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end
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end
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end
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end
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