Class: LogRunes::SessionRequestTagger

Inherits:
Object
  • Object
show all
Defined in:
lib/log_runes/session_request_tagger.rb

Constant Summary collapse

GLYPHS =

These glyphs should be chosen to maximize visual distinctiveness while being available in OSX terminal fonts.

%w(
  a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5
  A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 6 7 8 9 ♓ ÿ
  À Á ♑ Ã Ä Å Æ Ç È ♐ Ê Ë Ì Í Î Ï Ð Ñ Ò Ó ♋ Õ Ö × Ø Ù Ú Û Ü ♎ ♒ ♈
  Ý Þ ß à á â ã ä å æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ÷ ø ù ú û ü
  ΐ §  Γ Δ © ® ¥ Θ £ ¿ Λ « » Ξ ± Π ¤ Σ ¢ ¡ Φ ° Ψ Ω Ϊ Ϋ ά έ ή ί ΰ
  α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω ϊ ϋ ό ύ ώ ϐ ϑ
  ϒ ϓ ϔ ϕ ϖ ϗ Ϙ ϙ Ϛ ϛ Ϝ ϝ Ϟ ϟ Ϡ ϡ Ϣ ϣ Ϥ ϥ Ϧ ϧ Ϩ ϩ Ϫ ϫ Ϭ ϭ Ϯ ϯ ϰ ϱ
  ♥ Б ♦ ♠ Д ♣ Ж ★ И Й ☉ Л ☇ ☈ ☃ П ☂ ☀ ☄ ☆ Ф ☢ Ц Ч Ш Щ Ъ Ы ☥ Э Ю Я
)

Class Method Summary collapse

Class Method Details

.proc ⇒ Object

At this point in the middleware, we don’t have access to the session. A good approximation is the passed-up session id, although it’s controlled by the client. We ‘sign’ it with a compressed visual representation that doesn’t clutter up the log too badly and is still highly likely to be unique when used for debugging expeditions into the log.

An abbreviated signature of the request id is added as well, to aid in understanding interleaved log entries.



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# File 'lib/log_runes/session_request_tagger.rb', line 41

def self.proc
  Proc.new do |req|
    # Set the tag in the rack environment so it can be picked up by
    # tools like Airbrake.
    sess_id = req.cookies[Rails.application.config.session_options[:key]]
    req.env['request_tag'] = signature(sess_id, req.uuid)
  end
end

.sign(hex) ⇒ Object 



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# File 'lib/log_runes/session_request_tagger.rb', line 21

def self.sign(hex)
  hex.scan(/\h\h/).map do |b|
    GLYPHS[b.to_i(16)]
  end.join
end

.signature(sid, rid) ⇒ Object 



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# File 'lib/log_runes/session_request_tagger.rb', line 27

def self.signature(sid, rid)
  "#{sid ? sign(sid[0,8]) : '----'} #{sign(rid[0,4])}"
end

.wrap(wrapee) ⇒ Object 



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# File 'lib/log_runes/session_request_tagger.rb', line 50

def self.wrap(wrapee)
  
  class << wrapee
    
    alias_method :add_original, :add
    
    # Tag each line if multiple are passed in.
    def add(severity, message = nil, progname = nil, &block)
      message = (block_given? ? block.call : progname) if message.nil?
      if message && message.include?("\n")
        message.lines{|l| add_original(severity, l.chomp)}
      else
        add_original(severity, message)
      end
    end
    
  end
  
end