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63 lines
2.4 KiB
Ruby
63 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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require 'checksum'
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# Provides helper methods to compute footprints
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class FootprintService
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class << self
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# Compute the footprint
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# @param klass a class inheriting from Footprintable
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# @param item an instance of the provided class
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# @param sort_on the items in database by the provided criterion, to find the previous one
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def compute_footprint(klass, item, sort_on = 'id')
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Checksum.text(FootprintService.footprint_data(klass, item, sort_on))
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end
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# Return the original data string used to compute the footprint
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# @param klass a class inheriting from Footprintable
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# @param item an instance of the provided class
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# @param sort_on the items in database by the provided criterion, to find the previous one
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def footprint_data(klass, item, sort_on = 'id')
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raise TypeError unless item.is_a? klass
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previous = klass.where("#{sort_on} < ?", item[sort_on])
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.order("#{sort_on} DESC")
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.limit(1)
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columns = FootprintService.footprint_columns(klass)
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"#{columns.map { |c| comparable(item[c]) }.join}#{previous.first ? previous.first.footprint : ''}"
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end
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# Return an ordered array of the columns used in the footprint computation
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# @param klass a class inheriting from Footprintable
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def footprint_columns(klass)
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klass.columns.map(&:name).delete_if { |c| %w[footprint updated_at].concat(klass.columns_out_of_footprint).include? c }
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end
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# Logs a debugging message to help finding why a footprint is invalid
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# @param klass a class inheriting from Footprintable
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# @param item an instance of the provided class
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def debug_footprint(klass, item)
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columns = FootprintService.footprint_columns(klass)
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current = FootprintService.footprint_data(klass, item)
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saved = FootprintDebug.find_by(footprint: item.footprint, klass: klass.name)
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puts "Debug footprint for #{klass} [ id: #{item.id} ]"
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puts '-----------------------------------------'
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puts "columns: [ #{columns.join(', ')} ]"
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puts "current: #{current}"
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puts " saved: #{saved&.data}"
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puts '-----------------------------------------'
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end
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private
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# Return a comparable value for jsonb fields (with keys ordered alphabetically)
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def comparable(value)
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return value unless value.class == Hash
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value.sort.to_h
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end
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end
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end
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