Class: Bud::BudServer

Inherits:
EM::Connection
  • Object
show all
Defined in:
lib/bud/server.rb

Overview

:nodoc: all

Instance Method Summary collapse

Constructor Details

#initialize(bud, channel_filter) ⇒ BudServer



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# File 'lib/bud/server.rb', line 4

def initialize(bud, channel_filter)
  @bud = bud
  @channel_filter = channel_filter
  @filter_buf = {}
  @pac = MessagePack::Unpacker.new
  super
end

Instance Method Details

#receive_data(data) ⇒ Object



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# File 'lib/bud/server.rb', line 12

def receive_data(data)
  # Feed the received data to the deserializer
  @pac.feed_each(data) do |obj|
    recv_message(obj)
  end

  # apply the channel filter to each channel's pending tuples
  buf_leftover = {}
  @filter_buf.each do |tbl_name, buf|
    if @channel_filter
      accepted, saved = @channel_filter.call(tbl_name, buf)
    else
      accepted = buf
      saved = []
    end

    unless accepted.empty?
      @bud.inbound[tbl_name] ||= []
      @bud.inbound[tbl_name].concat(accepted)
    end
    buf_leftover[tbl_name] = saved unless saved.empty?
  end
  @filter_buf = buf_leftover

  begin
    @bud.tick_internal if @bud.running_async
  rescue Exception => e
    # If we raise an exception here, EM dies, which causes problems (e.g.,
    # other Bud instances in the same process will crash). Ignoring the
    # error isn't best though -- we should do better (#74).
    puts "Exception handling network messages: #{e}"
    puts e.backtrace
    puts "Inbound messages:"
    @bud.inbound.each do |chn_name, t|
      puts "    #{t.inspect} (channel: #{chn_name})"
    end
    @bud.inbound.clear
  end

  @bud.rtracer.sleep if @bud.options[:rtrace]
end

#recv_message(obj) ⇒ Object



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# File 'lib/bud/server.rb', line 54

def recv_message(obj)
  unless (obj.class <= Array and obj.length == 3 and
          @bud.tables.include?(obj[0].to_sym) and
          obj[1].class <= Array and obj[2].class <= Array)
    raise Bud::Error, "bad inbound message of class #{obj.class}: #{obj.inspect}"
  end

  # Deserialize any nested marshalled values
  tbl_name, tuple, marshall_indexes = obj
  marshall_indexes.each do |i|
    if i < 0 || i >= tuple.length
      raise Bud::Error, "bad inbound message: marshalled value at index #{i}, #{obj.inspect}"
    end
    tuple[i] = Marshal.load(tuple[i])
  end

  obj = [tbl_name, tuple]
  @bud.rtracer.recv(obj) if @bud.options[:rtrace]
  @filter_buf[obj[0].to_sym] ||= []
  @filter_buf[obj[0].to_sym] << obj[1]
end