module Graphiterb
  class Sender
    def initialize
      open!
    end

    def open!
      begin
        Graphiterb.log.warn "Connecting to server #{Settings.carbon_server} port #{Settings.carbon_port}"
        @socket = TCPSocket.new(Settings.carbon_server, Settings.carbon_port)
      rescue StandardError => e
        Graphiterb.log.warn "Couldn't connect to server #{Settings.carbon_server} port #{Settings.carbon_port}: #{e.class} #{e}"
        $stderr
      end
    end

    def socket
      @socket ||= open!
    end

    def safely &block
      begin
        block.call
      rescue StandardError => e
        Graphiterb.log.warn "Sleeping #{Settings.on_error_delay}: #{e.class} #{e}"
        sleep Settings.on_error_delay
        @socket = nil
        return nil
      end
    end

    def timestamp
      Time.now.to_i
    end

    def send *metrics
      now = timestamp
      safely do
        message = metrics.map{|metric, val, ts| [metric, val, (ts||now)].join(" ") }.join("\n")+"\n"
        socket.puts(message)
        Graphiterb.log.info message.gsub(/\n+/, "\t")
      end
    end
  end
end