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impress/app/services/owls_value_guide.rb

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