# -*- encoding: binary -*-
# :enddoc:
module Rainbows

  class Error
    class << self

      # if we get any error, try to write something back to the client
      # assuming we haven't closed the socket, but don't get hung up
      # if the socket is already closed or broken.  We'll always ensure
      # the socket is closed at the end of this function
      def write(io, e)
        msg = Error.response(e) and io.write_nonblock(msg)
        rescue
      end

      def app(e)
        G.server.logger.error "app error: #{e.inspect}"
        G.server.logger.error e.backtrace.join("\n")
        rescue
      end

      def listen_loop(e)
        G.alive or return
        G.server.logger.error "listen loop error: #{e.inspect}."
        G.server.logger.error e.backtrace.join("\n")
        rescue
      end

      def response(e)
        case e
        when EOFError, Errno::ECONNRESET, Errno::EPIPE, Errno::EINVAL,
             Errno::EBADF, Errno::ENOTCONN
          # swallow error if client shuts down one end or disconnects
        when Unicorn::HttpParserError
          Const::ERROR_400_RESPONSE # try to tell the client they're bad
        when IOError # HttpParserError is an IOError
        else
          app(e)
          Const::ERROR_500_RESPONSE
        end
      end

    end
  end
end