Class: Lono::Md5

Inherits:
Object
  • Object
show all
Extended by:
Memoist
Defined in:
lib/lono/md5.rb

Class Method Summary collapse

Class Method Details

.name(path) ⇒ Object 



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# File 'lib/lono/md5.rb', line 32

def name(path)
  relative_path = name_without_md5(path)
  relative_path = relative_path.sub(/\.(\w+)$/,'') # strip extension
  ext = File.directory?(path) ? "zip" : $1
  md5 = sum(path)
  "#{relative_path}-#{md5}.#{ext}"
end

.name_without_md5(path) ⇒ Object 



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# File 'lib/lono/md5.rb', line 40

def name_without_md5(path)
  regexp = %r{.*/output/[\w_-]+/files/}
  path.sub(regexp, '') # relative_path w/o md5
end

.sum(path) ⇒ Object

This checksum within the file name is to mainly make sure that Lambda::Function resources “change” and an update is triggered. There’s another checksum in the upload code that makes sure we don’t upload the code again to speed up things.



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# File 'lib/lono/md5.rb', line 17

def sum(path)
  files = Dir["#{path}/**/*"]
  files = files.reject { |f| File.directory?(f) }
               .reject { |f| File.symlink?(f) }
  files.sort!
  content = files.map do |f|
    Digest::MD5.file(f).to_s[0..7]
  end.join

  md5 = Digest::MD5.new
  md5.update(content)
  md5.hexdigest.to_s[0..7]
end