read from file and parse information.
require 'json'
$last_id = 6961930
IO.foreach("trade.out") do |line|
fields = line.split(' ')
trade_json = fields[1]
trade = JSON.parse(trade_json)
trade_id = trade['trade_id'].to_i
# puts "trade_id #{trade_id}"
# puts "last_trade_id #{$last_id}"
if trade_id != $last_id + 1
puts $last_id + 1
end
$last_id = trade_id
end