super id

super-id.rb

require 'socket' # for gethostname                                                               
                                                                                
class LogId                                                                     
  @@hostname = Socket.gethostname                                               
  @@hostid = @@hostname.gsub('.', '').downcase.each_char.inject(""){|r,c| r += c.ord.to_s}.to_i
  @@hostid_short = @@hostname.gsub('.', '').downcase.each_char.inject(0){|r,c| r += c.ord}
                                                                                
  def self.get(*opts)  
    # opts = [:host] if opts.empty?   # modify defaults                                                       
    time = Time.now.usec.to_i                                                   
    "#{opts.include?(:host) ? "#{opts.include?(:plain) ? @@hostname : base62(opts.include?(:long) ? @@hostid : @@hostid_short)}-" : ''}#{base62(Time.now.to_i)}-#{base62(Time.now.nsec.to_i)}#{opts.include?(:random) ? "-#{base62(rand(1024))}" : ''}"
  end                                                                           
                                                                                
  private                                                                       
                                                                                
  def self.base62(num)                                                          
    base62 = ('0'..'9').to_a + ('a'..'z').to_a + ('A'..'Z').to_a                
    s = ''                                                                      
    while num > 0                                                               
      s << base62[num.modulo(62)]                                               
      num /= 62                                                                 
    end                                                                         
    s.reverse                                                                   
  end                                                                           
end                                                                             
                                                                                                                  
puts LogId.get(:host, :long, :random)

# output of get(:host, :random) :  
# 8P-1sf0Rl-ogYlW-86
# ^ host-id  
#    ^ unixtime
#           ^ nanoseconds
#                 ^ random(1024)

# $ ruby super-id.rb
# get()                       1sf0Rl-ofGQH
# get(:random)                1sf0Rl-og4n8-6k
# get(:host, :long)           32AjoHXL-1sf0Rl-ogB5T
# get(:host, :long, :random)  32AjoHXL-1sf0Rl-ogYlW-86
# get(:host, :plain, :random) maventa110-1sf0Rl-ohkPh-6i
# get(:host, :random)         8P-1sf0Rl-ohH6B-52