puma--puma/lib/puma/null_io.rb

# frozen_string_literal: true

module Puma
  # Provides an IO-like object that always appears to contain no data.
  # Used as the value for rack.input when the request has no body.
  #
  class NullIO
    def gets
      nil
    end

    def string
      ""
    end

    def each
    end

    # Mimics IO#read with no data.
    #
    def read(count = nil, _buffer = nil)
      count && count > 0 ? nil : ""
    end

    def rewind
    end

    def close
    end

    def size
      0
    end

    def eof?
      true
    end

    def sync
      true
    end

    def sync=(v)
    end

    def puts(*ary)
    end

    def write(*ary)
    end

    def flush
      self
    end

    # This is used as singleton class, so can't have state.
    def closed?
      false
    end
  end
end