forked from OpenNeo/impress
76 lines
1.9 KiB
Ruby
76 lines
1.9 KiB
Ruby
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module OwlsValueGuide
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include HTTParty
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ITEMDATA_URL_TEMPLATE = Addressable::Template.new(
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"https://neo-owls.net/itemdata/{item_name}"
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)
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def self.find_by_name(item_name)
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# Load the itemdata, pulling from the Rails cache if possible.
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cache_key = "OwlsValueGuide/itemdata/#{item_name}"
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data = Rails.cache.fetch(cache_key, expires_in: 15.minutes) do
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load_itemdata(item_name)
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end
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if data == :not_found
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raise NotFound
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end
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# Owls has records of some items that it explicitly marks as having no
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# listed value. We don't care about that distinction, just return nil!
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return nil if data['owls_value'].blank?
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Value.new(data['owls_value'], parse_last_updated(data['last_updated']))
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end
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Value = Struct.new(:value_text, :updated_at)
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class Error < StandardError;end
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class NetworkError < Error;end
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class NotFound < Error;end
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private
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def self.load_itemdata(item_name)
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Rails.logger.info "[OwlsValueGuide] Loading value for #{item_name.inspect}"
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url = ITEMDATA_URL_TEMPLATE.expand(item_name: item_name)
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begin
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res = get(url)
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rescue StandardError => error
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raise NetworkError, "Couldn't connect to Owls: #{error.message}"
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end
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if res.code == 404
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# Instead of raising immediately, return `:not_found` to save this
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# result in the cache, then raise *after* we exit the cache block. That
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# way, we won't make repeat requests for items we have that Owls
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# doesn't.
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return :not_found
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end
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if res.code != 200
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raise NetworkError, "Owls returned status code #{res.code} (expected 200)"
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end
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begin
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res.parsed_response
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rescue HTTParty::Error => error
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raise NetworkError, "Owls returned unsupported data format: #{error.message}"
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end
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end
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def self.parse_last_updated(date_str)
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return nil if date_str.blank?
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begin
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Date.strptime(date_str, '%Y-%m-%d')
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rescue Date::Error
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Rails.logger.error(
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"[OwlsValueGuide] unexpected last_updated format: #{date_str.inspect}"
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)
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return nil
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end
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end
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end
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