require 'thread'
require 'open3'

require 'populus/pool'
require 'json'

module Populus
  class WatchThread
    def self.consul_watch(*args)
      wait = Thread.fork do
        begin
          stdin, stdout, stderr = *Open3.popen3(
            Populus.consul_bin, 'watch', *args, '/bin/cat'
          )
          stdin.close
          name = args[args.index('-name') + 1]
          while l = stdout.gets
            Populus.logger.debug "accept JSON: %s" % l
            data = JSON.parse l

            accepters = Populus::Pool.find_events_by_name(name)
            accepters.each do |accepter|
              begin
                accepter.accept(data)
              rescue => e
                Populus.logger.warn "Error on event: %s, %s. Skip." % [e.class, e.message]
              end
            end
          end
        rescue => e
          Populus.logger.error e
        end
      end
      return wait
    end
  end
end