pulibrary / pdc_describe / 4e4e59fc-9df4-4838-9fd4-6c7ea33cdb7c

coverage: 1.283% (-94.6%) from 95.862%
4e4e59fc-9df4-4838-9fd4-6c7ea33cdb7c

Pull #1994

circleci

hectorcorrea 
Switched to use the autocomplete that we aleady use for ROR. Integrated it with the existing logic for creators
Pull Request #1994: Started adding auto complete to contributors

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0.0
/app/models/upload_snapshot.rb
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# frozen_string_literal: true
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class UploadSnapshot < ApplicationRecord
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  belongs_to :work
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  attr_writer :upload
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  alias_attribute :existing_files, :files




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  def snapshot_deletions(work_changes, s3_filenames)




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    s3_filenames_sorted = s3_filenames.sort




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    existing_files.each do |file|




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      filename = file["filename"]




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      # Use Ruby's Binary Search functionality instead of a plain Ruby Array `.include?`










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      # to detect missing values in the array because the binary search performs










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      # much faster when the list of files is large. Notice that the binary search










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      # requires that the list of files is sorted.










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      # See https://ruby-doc.org/3.3.6/bsearch_rdoc.html











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      if s3_filenames_sorted.bsearch { |s3_filename| filename <=> s3_filename }.nil?




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        work_changes << { action: "removed", filename:, checksum: file["checksum"] }




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      end




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    end




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  end




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  def snapshot_modifications(work_changes, s3_files)




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    # check for modifications











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    s3_files.each do |s3_file|




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      match = existing_files_sorted.bsearch { |file| s3_file.filename <=> file["filename"] }




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      if match.nil?




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        work_changes << { action: "added", filename: s3_file.filename, checksum: s3_file.checksum }




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      elsif UploadSnapshot.checksum_compare(match["checksum"], s3_file.checksum) == false




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        work_changes << { action: "replaced", filename: s3_file.filename, checksum: s3_file.checksum }




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      end




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    end




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  end




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  def upload




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    @upload ||= uploads.find { |s3_file| filenames.include?(s3_file.filename) }




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  end




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  def uri




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    URI.parse(url)




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  end




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  def filenames




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    files.map { |file| file["filename"] }




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  end




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  def store_files(s3_files)




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    self.files = s3_files.map { |file| { "filename" => file.filename, "checksum" => file.checksum } }




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  end




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  def self.find_by_filename(work_id:, filename:)




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    find_by("work_id = ? AND files @> ?", work_id, JSON.dump([{ filename: }]))




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  end




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  class << self




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    # Compares two checksums. Accounts for the case in which one of them is










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    # a plain MD5 value and the other has been encoded with base64.










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    # See also










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    #   https://ruby-doc.org/core-2.7.0/Array.html#method-i-pack










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    #   https://ruby-doc.org/core-2.7.0/String.html#method-i-unpack











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    def checksum_compare(checksum1, checksum2)




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      if checksum1 == checksum2




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        true




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      elsif checksum1.nil? || checksum2.nil?




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        false




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      elsif checksum1.length < checksum2.length




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        # Decode the first one and then compare











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        checksum1.unpack("m0").first.unpack("H*").first == checksum2




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      else




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        # Decode the second one and then compare











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        checksum1 == checksum2.unpack("m0").first.unpack("H*").first




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      end




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    rescue ArgumentError




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      # One of the values was not properly encoded











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      false




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    end




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  end




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  private




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    def existing_files_sorted




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      @existing_files_sorted ||= files.sort_by { |file| file["filename"] }




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    end




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    def uploads




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      work.uploads




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    end




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end




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