You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: trade_stream.rb
    path of file: ./repos/cryptoexchange/lib/cryptoexchange/exchanges/bitfinex/services
    
    the code of the file until where you have to start completion: module Cryptoexchange::Exchanges
  module Bitfinex
    module Services
      class TradeStream < Cryptoexchange::Services::TradeStream
        def url
          Cryptoexchange::Exchanges::Bitfinex::Market::WS_URL
        end

        def subscribe_event(market_pair)
          {
            event:   "subscribe",
            channel: "trades",
            pair:    "#{market_pair.base}#{market_pair.target}"
          }.to_json
        end

        def valid_message?(message)
          message.is_a?(Array) && message.length == 7
        end

        def parse_message(message, market_pair)
          # [ 5, 'te', '1234-BTCUSD', 1443659698, 236.42, 0.49064538 ]
        
    
        def parse_message(message, market_pair)
          # [ 5, 'te', '1234-BTCUSD', 1443659698, 236.42, 0.49064538 ]
          # [ 5, 'tu', '1234-BTCUSD', 15254529, 1443659698, 236.42, 0.49064538 ]
          # [67452,6614.9,36.37426215,6615,71.7470363,42.2,0.0064,6614.9,9981.07371415,6741.4366438,6570]
          #
          # CHANNEL_ID integer	Channel ID
          # SEQ	       string	  Trade sequence id
          # ID	       int	    Trade database id
          # TIMESTAMP	 int	    Unix timestamp of the trade.
          # PRICE	     float    Price at which the trade was executed
          # Â±AMOUNT	   float    How much was bought (positive) or sold (negative)
          trade           = Cryptoexchange::Models::Trade.new
          trade.base      = market_pair.base
          trade.target    = market_pair.target
          trade.market    = Bitfinex::Market::NAME
          trade.trade_id  = message[3]
          trade.type      = message[6] > 0 ? 'buy' : 'sell' # The order that causes the trade determines if it is a buy or a sell.
          trade.price     = message[5]
          trade.amount    = message[6]
          trade.timestamp = message[4]
          trade.payload   = message

          trade
        end