gistfile1.rb

require 'rubygems'
require 'json'
require 'pp'

############################################################
# mapper code
############################################################
def put_line line, action
  l = JSON.parse line 
  puts "#{l['uid']}\t#{action}:#{l['ip']}" if !l['uid'].nil?  
end

STDIN.each do |line|
  if line.match /u_c/
    put_line line, 'e'
  elsif line.match /a":"PAGE_LOAD/
    put_line line, 'a'
  end
  
end


############################################################
# mapper code
############################################################
def print_res uid, logged_in_ips
   puts "#{logged_in_ips}\t#{uid}" if uid != 0
end

current_uid = 0
logged_in_ips = 0
ips = Array.new

STDIN.each do |line|
  res = line.match /^(\d+)\t([a,e]):(.*)$/
  u_id    = res[1]
  action  = res[2]
  ip      = res[3]
  
  if u_id != current_uid
    print_res current_uid, logged_in_ips
    current_uid = u_id
    ips = Array.new
    logged_in_ips = 0
  end
  
  if action == 'a' && !ips.include?(ip)
    ips << ip 
  elsif action == 'e' && ips.include?(ip)
    logged_in_ips += 1
  end
  
end

print_res current_uid, logged_in_ips