Module: MLS::CLI::Documents

Defined in:
lib/mls/cli/documents.rb

Class Method Summary collapse

Class Method Details

.backup(dir) ⇒ Object 



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# File 'lib/mls/cli/documents.rb', line 31

def self.backup(dir)
  last_sync_file = File.join(dir, '.last_sync')
  storage_engines = {}
  storage_engines[:s3] = StandardStorage::S3.new(MLS::CLI.options[:s3]) if MLS::CLI.options[:s3]
  storage_engines[:b2] = StandardStorage::B2.new(MLS::CLI.options[:b2]) if MLS::CLI.options[:b2]
  
  query = if File.exist?(last_sync_file)
    from_timestamp = Time.iso8601(File.read(last_sync_file))
    Document.where(Document.arel_table['created_at'].gteq(from_timestamp))
  else
    Document.all
  end
  
  query.find_each do |document|
    if document.sha256 && File.exists?(File.join(dir, partition(document.sha256)))
      puts "Downloaded #{document.id}"
      next
    end
  
    if document.provider.nil?
      storage_engine = storage_engines[:s3]
      key = 'hash_key'
    elsif document.provider.include?('b2/sha256')
      storage_engine = storage_engines[:b2]
      key = 'sha256'
    elsif document.provider.include?('s3/hash_key')
      storage_engine = storage_engines[:s3]
      key = 'hash_key'
    else
      raise 'unkown storage engine'
    end
    
    print "Downloading #{document.id.to_s.ljust(7)} "
    storage_engine.copy_to_tempfile(document.send(key)) do |file|
      digests = calculate_digest(file)
      puts partition(document.sha256)
      
      raise 'MD5 does not match' if digests[:md5] != document.md5
      document.update!(digests.merge({provider: ['s3/hash_key']}))
      
      FileUtils.mkdir_p(File.dirname(File.join(dir, partition(document.sha256))))
      FileUtils.mv(file.path, File.join(dir, partition(document.sha256)))
    end
    
    File.write(last_sync_file, document.created_at.iso8601(6))
  end
end

.calculate_digest(file) ⇒ Object 



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# File 'lib/mls/cli/documents.rb', line 11

def self.calculate_digest(file)
  md5_digest = Digest::MD5.new
  sha1_digest = Digest::SHA1.new
  sha256_digest = Digest::SHA256.new

  buf = ""
  file.rewind
  while file.read(16384, buf)
    md5_digest << buf
    sha1_digest << buf
    sha256_digest << buf
  end

  {
    md5: md5_digest.hexdigest,
    sha1: sha1_digest.hexdigest,
    sha256: sha256_digest.hexdigest
  }
end

.partition(value, depth: 5) ⇒ Object 



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# File 'lib/mls/cli/documents.rb', line 6

def self.partition(value, depth: 5)
  split = value.scan(/.{1,4}/)
  split.shift(depth).join("/") + split.join("")
end