/usr/lib/ruby/vendor_ruby/pr_eventmachine.rb is in ruby-eventmachine 0.12.10-3.
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#
# Author:: Francis Cianfrocca (gmail: blackhedd)
# Homepage:: http://rubyeventmachine.com
# Date:: 8 Apr 2006
#
# See EventMachine and EventMachine::Connection for documentation and
# usage examples.
#
#----------------------------------------------------------------------------
#
# Copyright (C) 2006-07 by Francis Cianfrocca. All Rights Reserved.
# Gmail: blackhedd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of either: 1) the GNU General Public License
# as published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version; or 2) Ruby's License.
#
# See the file COPYING for complete licensing information.
#
#-------------------------------------------------------------------
#
#
# TODO List:
# TCP-connects currently assume non-blocking connect is available- need to
# degrade automatically on versions of Ruby prior to June 2006.
#
require 'singleton'
require 'forwardable'
require 'socket'
require 'fcntl'
require 'set'
module EventMachine
class << self
# This is mostly useful for automated tests.
# Return a distinctive symbol so the caller knows whether he's dealing
# with an extension or with a pure-Ruby library.
def library_type
:pure_ruby
end
# #initialize_event_machine
def initialize_event_machine
Reactor.instance.initialize_for_run
end
# #add_oneshot_timer
#--
# Changed 04Oct06: intervals from the caller are now in milliseconds, but our native-ruby
# processor still wants them in seconds.
def add_oneshot_timer interval
Reactor.instance.install_oneshot_timer(interval / 1000)
end
# run_machine
def run_machine
Reactor.instance.run
end
# release_machine. Probably a no-op.
def release_machine
end
# #stop
def stop
Reactor.instance.stop
end
# #connect_server. Return a connection descriptor to the caller.
# TODO, what do we return here if we can't connect?
def connect_server host, port
bind_connect_server nil, nil, host, port
end
def bind_connect_server bind_addr, bind_port, host, port
EvmaTCPClient.connect(bind_addr, bind_port, host, port).uuid
end
# #send_data
def send_data target, data, datalength
selectable = Reactor.instance.get_selectable( target ) or raise "unknown send_data target"
selectable.send_data data
end
# #close_connection
# The extension version does NOT raise any kind of an error if an attempt is made
# to close a non-existent connection. Not sure whether we should. For now, we'll
# raise an error here in that case.
def close_connection target, after_writing
selectable = Reactor.instance.get_selectable( target ) or raise "unknown close_connection target"
selectable.schedule_close after_writing
end
# #start_tcp_server
def start_tcp_server host, port
(s = EvmaTCPServer.start_server host, port) or raise "no acceptor"
s.uuid
end
# #stop_tcp_server
def stop_tcp_server sig
s = Reactor.instance.get_selectable(sig)
s.schedule_close
end
# #start_unix_server
def start_unix_server chain
(s = EvmaUNIXServer.start_server chain) or raise "no acceptor"
s.uuid
end
# #connect_unix_server
def connect_unix_server chain
EvmaUNIXClient.connect(chain).uuid
end
# #signal_loopbreak
def signal_loopbreak
Reactor.instance.signal_loopbreak
end
# #get_peername
def get_peername sig
selectable = Reactor.instance.get_selectable( sig ) or raise "unknown get_peername target"
selectable.get_peername
end
# #open_udp_socket
def open_udp_socket host, port
EvmaUDPSocket.create(host, port).uuid
end
# #send_datagram. This is currently only for UDP!
# We need to make it work with unix-domain sockets as well.
def send_datagram target, data, datalength, host, port
selectable = Reactor.instance.get_selectable( target ) or raise "unknown send_data target"
selectable.send_datagram data, Socket::pack_sockaddr_in(port, host)
end
# #set_timer_quantum in milliseconds. The underlying Reactor function wants a (possibly
# fractional) number of seconds.
def set_timer_quantum interval
Reactor.instance.set_timer_quantum(( 1.0 * interval) / 1000.0)
end
# #epoll is a harmless no-op in the pure-Ruby implementation. This is intended to ensure
# that user code behaves properly across different EM implementations.
def epoll
end
# #ssl? is not implemented for pure-Ruby implementation
def ssl?
false
end
# #set_rlimit_nofile is a no-op in the pure-Ruby implementation. We simply return Ruby's built-in
# per-process file-descriptor limit.
def set_rlimit_nofile n
1024
end
# #set_max_timer_count is a harmless no-op in pure Ruby, which doesn't have a built-in limit
# on the number of available timers.
def set_max_timer_count n
end
# #send_file_data
def send_file_data sig, filename
sz = File.size(filename)
raise "file too large" if sz > 32*1024
data =
begin
File.read filename
rescue
""
end
send_data sig, data, data.length
end
# #get_outbound_data_size
#
def get_outbound_data_size sig
r = Reactor.instance.get_selectable( sig ) or raise "unknown get_outbound_data_size target"
r.get_outbound_data_size
end
# #read_keyboard
#
def read_keyboard
EvmaKeyboard.open.uuid
end
# #set_comm_inactivity_timeout
#
def set_comm_inactivity_timeout sig, tm
r = Reactor.instance.get_selectable( sig ) or raise "unknown set_comm_inactivity_timeout target"
r.set_inactivity_timeout tm
end
end
end
#-----------------------------------------------------------------
module EventMachine
class Error < Exception; end
end
#-----------------------------------------------------------------
module EventMachine
class Connection
def get_outbound_data_size
EventMachine::get_outbound_data_size @signature
end
end
end
#-----------------------------------------------------------------
module EventMachine
# Factored out so we can substitute other implementations
# here if desired, such as the one in ActiveRBAC.
module UuidGenerator
def self.generate
if @ix and @ix >= 10000
@ix = nil
@seed = nil
end
@seed ||= `uuidgen`.chomp.gsub(/-/,"")
@ix ||= 0
"#{@seed}#{@ix += 1}"
end
end
end
#-----------------------------------------------------------------
module EventMachine
TimerFired = 100
ConnectionData = 101
ConnectionUnbound = 102
ConnectionAccepted = 103
ConnectionCompleted = 104
LoopbreakSignalled = 105
end
#-----------------------------------------------------------------
module EventMachine
class Reactor
include Singleton
HeartbeatInterval = 2
attr_reader :current_loop_time
def initialize
initialize_for_run
end
#--
# Replaced original implementation 05Dec07, was way too slow because of the sort.
def install_oneshot_timer interval
uuid = UuidGenerator::generate
#@timers << [Time.now + interval, uuid]
#@timers.sort! {|a,b| a.first <=> b.first}
@timers.add([Time.now + interval, uuid])
uuid
end
# Called before run, this is a good place to clear out arrays
# with cruft that may be left over from a previous run.
def initialize_for_run
@running = false
@stop_scheduled = false
@selectables ||= {}; @selectables.clear
@timers = SortedSet.new # []
set_timer_quantum(0.1)
@current_loop_time = Time.now
@next_heartbeat = @current_loop_time + HeartbeatInterval
end
def add_selectable io
@selectables[io.uuid] = io
end
def get_selectable uuid
@selectables[uuid]
end
def run
raise Error.new( "already running" ) if @running
@running = true
begin
open_loopbreaker
loop {
@current_loop_time = Time.now
break if @stop_scheduled
run_timers
break if @stop_scheduled
crank_selectables
break if @stop_scheduled
run_heartbeats
}
ensure
close_loopbreaker
@selectables.each {|k, io| io.close}
@selectables.clear
@running = false
end
end
def run_timers
@timers.each {|t|
if t.first <= @current_loop_time
@timers.delete t
EventMachine::event_callback "", TimerFired, t.last
else
break
end
}
#while @timers.length > 0 and @timers.first.first <= now
# t = @timers.shift
# EventMachine::event_callback "", TimerFired, t.last
#end
end
def run_heartbeats
if @next_heartbeat <= @current_loop_time
@next_heartbeat = @current_loop_time + HeartbeatInterval
@selectables.each {|k,io| io.heartbeat}
end
end
def crank_selectables
#$stderr.write 'R'
readers = @selectables.values.select {|io| io.select_for_reading?}
writers = @selectables.values.select {|io| io.select_for_writing?}
s = select( readers, writers, nil, @timer_quantum)
s and s[1] and s[1].each {|w| w.eventable_write }
s and s[0] and s[0].each {|r| r.eventable_read }
@selectables.delete_if {|k,io|
if io.close_scheduled?
io.close
true
end
}
end
# #stop
def stop
raise Error.new( "not running") unless @running
@stop_scheduled = true
end
def open_loopbreaker
# Can't use an IO.pipe because they can't be set nonselectable in Windows.
# Pick a random localhost UDP port.
#@loopbreak_writer.close if @loopbreak_writer
#rd,@loopbreak_writer = IO.pipe
@loopbreak_reader = UDPSocket.new
@loopbreak_writer = UDPSocket.new
bound = false
100.times {
@loopbreak_port = rand(10000) + 40000
begin
@loopbreak_reader.bind "localhost", @loopbreak_port
bound = true
break
rescue
end
}
raise "Unable to bind Loopbreaker" unless bound
LoopbreakReader.new(@loopbreak_reader)
end
def close_loopbreaker
@loopbreak_writer.close
@loopbreak_writer = nil
end
def signal_loopbreak
#@loopbreak_writer.write '+' if @loopbreak_writer
@loopbreak_writer.send('+',0,"localhost",@loopbreak_port) if @loopbreak_writer
end
def set_timer_quantum interval_in_seconds
@timer_quantum = interval_in_seconds
end
end
end
#--------------------------------------------------------------
class IO
extend Forwardable
def_delegator :@my_selectable, :close_scheduled?
def_delegator :@my_selectable, :select_for_reading?
def_delegator :@my_selectable, :select_for_writing?
def_delegator :@my_selectable, :eventable_read
def_delegator :@my_selectable, :eventable_write
def_delegator :@my_selectable, :uuid
def_delegator :@my_selectable, :send_data
def_delegator :@my_selectable, :schedule_close
def_delegator :@my_selectable, :get_peername
def_delegator :@my_selectable, :send_datagram
def_delegator :@my_selectable, :get_outbound_data_size
def_delegator :@my_selectable, :set_inactivity_timeout
def_delegator :@my_selectable, :heartbeat
end
#--------------------------------------------------------------
module EventMachine
class Selectable
attr_reader :io, :uuid
def initialize io
@uuid = UuidGenerator.generate
@io = io
@last_activity = Reactor.instance.current_loop_time
if defined?(Fcntl::F_GETFL)
m = @io.fcntl(Fcntl::F_GETFL, 0)
@io.fcntl(Fcntl::F_SETFL, Fcntl::O_NONBLOCK | m)
else
# Windows doesn't define F_GETFL.
# It's not very reliable about setting descriptors nonblocking either.
begin
s = Socket.for_fd(@io.fileno)
s.fcntl( Fcntl::F_SETFL, Fcntl::O_NONBLOCK )
rescue Errno::EINVAL, Errno::EBADF
STDERR.puts "Serious error: unable to set descriptor non-blocking"
end
end
# TODO, should set CLOEXEC on Unix?
@close_scheduled = false
@close_requested = false
se = self; @io.instance_eval { @my_selectable = se }
Reactor.instance.add_selectable @io
end
def close_scheduled?
@close_scheduled
end
def select_for_reading?
false
end
def select_for_writing?
false
end
def get_peername
nil
end
def set_inactivity_timeout tm
@inactivity_timeout = tm
end
def heartbeat
end
end
end
#--------------------------------------------------------------
module EventMachine
class StreamObject < Selectable
def initialize io
super io
@outbound_q = []
end
# If we have to close, or a close-after-writing has been requested,
# then don't read any more data.
def select_for_reading?
true unless (@close_scheduled || @close_requested)
end
# If we have to close, don't select for writing.
# Otherwise, see if the protocol is ready to close.
# If not, see if he has data to send.
# If a close-after-writing has been requested and the outbound queue
# is empty, convert the status to close_scheduled.
def select_for_writing?
unless @close_scheduled
if @outbound_q.empty?
@close_scheduled = true if @close_requested
false
else
true
end
end
end
# Proper nonblocking I/O was added to Ruby 1.8.4 in May 2006.
# If we have it, then we can read multiple times safely to improve
# performance.
# The last-activity clock ASSUMES that we only come here when we
# have selected readable.
# TODO, coalesce multiple reads into a single event.
# TODO, do the function check somewhere else and cache it.
def eventable_read
@last_activity = Reactor.instance.current_loop_time
begin
if io.respond_to?(:read_nonblock)
10.times {
data = io.read_nonblock(4096)
EventMachine::event_callback uuid, ConnectionData, data
}
else
data = io.sysread(4096)
EventMachine::event_callback uuid, ConnectionData, data
end
rescue Errno::EAGAIN, Errno::EWOULDBLOCK
# no-op
rescue Errno::ECONNRESET, Errno::ECONNREFUSED, EOFError
@close_scheduled = true
EventMachine::event_callback uuid, ConnectionUnbound, nil
end
end
# Provisional implementation. Will be re-implemented in subclasses.
# TODO: Complete this implementation. As it stands, this only writes
# a single packet per cycle. Highly inefficient, but required unless
# we're running on a Ruby with proper nonblocking I/O (Ruby 1.8.4
# built from sources from May 25, 2006 or newer).
# We need to improve the loop so it writes multiple times, however
# not more than a certain number of bytes per cycle, otherwise
# one busy connection could hog output buffers and slow down other
# connections. Also we should coalesce small writes.
# URGENT TODO: Coalesce small writes. They are a performance killer.
# The last-activity recorder ASSUMES we'll only come here if we've
# selected writable.
def eventable_write
# coalesce the outbound array here, perhaps
@last_activity = Reactor.instance.current_loop_time
while data = @outbound_q.shift do
begin
data = data.to_s
w = if io.respond_to?(:write_nonblock)
io.write_nonblock data
else
io.syswrite data
end
if w < data.length
@outbound_q.unshift data[w..-1]
break
end
rescue Errno::EAGAIN
@outbound_q.unshift data
rescue EOFError, Errno::ECONNRESET, Errno::ECONNREFUSED
@close_scheduled = true
@outbound_q.clear
end
end
end
# #send_data
def send_data data
# TODO, coalesce here perhaps by being smarter about appending to @outbound_q.last?
unless @close_scheduled or @close_requested or !data or data.length <= 0
@outbound_q << data.to_s
end
end
# #schedule_close
# The application wants to close the connection.
def schedule_close after_writing
if after_writing
@close_requested = true
else
@close_scheduled = true
end
end
# #get_peername
# This is defined in the normal way on connected stream objects.
# Return an object that is suitable for passing to Socket#unpack_sockaddr_in or variants.
# We could also use a convenience method that did the unpacking automatically.
def get_peername
io.getpeername
end
# #get_outbound_data_size
def get_outbound_data_size
@outbound_q.inject(0) {|memo,obj| memo += (obj || "").length}
end
def heartbeat
if @inactivity_timeout and @inactivity_timeout > 0 and (@last_activity + @inactivity_timeout) < Reactor.instance.current_loop_time
schedule_close true
end
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaTCPClient < StreamObject
def self.connect bind_addr, bind_port, host, port
sd = Socket.new( Socket::AF_INET, Socket::SOCK_STREAM, 0 )
sd.bind( Socket.pack_sockaddr_in( bind_port, bind_addr )) if bind_addr
begin
# TODO, this assumes a current Ruby snapshot.
# We need to degrade to a nonblocking connect otherwise.
sd.connect_nonblock( Socket.pack_sockaddr_in( port, host ))
rescue Errno::EINPROGRESS
end
EvmaTCPClient.new sd
end
def initialize io
super
@pending = true
end
def select_for_writing?
@pending ? true : super
end
def select_for_reading?
@pending ? false : super
end
def eventable_write
if @pending
@pending = false
if 0 == io.getsockopt(Socket::SOL_SOCKET, Socket::SO_ERROR).unpack("i").first
EventMachine::event_callback uuid, ConnectionCompleted, ""
end
else
super
end
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaKeyboard < StreamObject
def self.open
EvmaKeyboard.new STDIN
end
def initialize io
super
end
def select_for_writing?
false
end
def select_for_reading?
true
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaUNIXClient < StreamObject
def self.connect chain
sd = Socket.new( Socket::AF_LOCAL, Socket::SOCK_STREAM, 0 )
begin
# TODO, this assumes a current Ruby snapshot.
# We need to degrade to a nonblocking connect otherwise.
sd.connect_nonblock( Socket.pack_sockaddr_un( chain ))
rescue Errno::EINPROGRESS
end
EvmaUNIXClient.new sd
end
def initialize io
super
@pending = true
end
def select_for_writing?
@pending ? true : super
end
def select_for_reading?
@pending ? false : super
end
def eventable_write
if @pending
@pending = false
if 0 == io.getsockopt(Socket::SOL_SOCKET, Socket::SO_ERROR).unpack("i").first
EventMachine::event_callback uuid, ConnectionCompleted, ""
end
else
super
end
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaTCPServer < Selectable
# TODO, refactor and unify with EvmaUNIXServer.
class << self
# Versions of ruby 1.8.4 later than May 26 2006 will work properly
# with an object of type TCPServer. Prior versions won't so we
# play it safe and just build a socket.
#
def start_server host, port
sd = Socket.new( Socket::AF_INET, Socket::SOCK_STREAM, 0 )
sd.setsockopt( Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true )
sd.bind( Socket.pack_sockaddr_in( port, host ))
sd.listen( 50 ) # 5 is what you see in all the books. Ain't enough.
EvmaTCPServer.new sd
end
end
def initialize io
super io
end
def select_for_reading?
true
end
#--
# accept_nonblock returns an array consisting of the accepted
# socket and a sockaddr_in which names the peer.
# Don't accept more than 10 at a time.
def eventable_read
begin
10.times {
descriptor,peername = io.accept_nonblock
sd = StreamObject.new descriptor
EventMachine::event_callback uuid, ConnectionAccepted, sd.uuid
}
rescue Errno::EWOULDBLOCK, Errno::EAGAIN
end
end
#--
#
def schedule_close
@close_scheduled = true
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaUNIXServer < Selectable
# TODO, refactor and unify with EvmaTCPServer.
class << self
# Versions of ruby 1.8.4 later than May 26 2006 will work properly
# with an object of type TCPServer. Prior versions won't so we
# play it safe and just build a socket.
#
def start_server chain
sd = Socket.new( Socket::AF_LOCAL, Socket::SOCK_STREAM, 0 )
sd.setsockopt( Socket::SOL_SOCKET, Socket::SO_REUSEADDR, true )
sd.bind( Socket.pack_sockaddr_un( chain ))
sd.listen( 50 ) # 5 is what you see in all the books. Ain't enough.
EvmaUNIXServer.new sd
end
end
def initialize io
super io
end
def select_for_reading?
true
end
#--
# accept_nonblock returns an array consisting of the accepted
# socket and a sockaddr_in which names the peer.
# Don't accept more than 10 at a time.
def eventable_read
begin
10.times {
descriptor,peername = io.accept_nonblock
sd = StreamObject.new descriptor
EventMachine::event_callback uuid, ConnectionAccepted, sd.uuid
}
rescue Errno::EWOULDBLOCK, Errno::EAGAIN
end
end
#--
#
def schedule_close
@close_scheduled = true
end
end
end
#--------------------------------------------------------------
module EventMachine
class LoopbreakReader < Selectable
def select_for_reading?
true
end
def eventable_read
io.sysread(128)
EventMachine::event_callback "", LoopbreakSignalled, ""
end
end
end
#--------------------------------------------------------------
module EventMachine
class DatagramObject < Selectable
def initialize io
super io
@outbound_q = []
end
# #send_datagram
def send_datagram data, target
# TODO, coalesce here perhaps by being smarter about appending to @outbound_q.last?
unless @close_scheduled or @close_requested
@outbound_q << [data.to_s, target]
end
end
# #select_for_writing?
def select_for_writing?
unless @close_scheduled
if @outbound_q.empty?
@close_scheduled = true if @close_requested
false
else
true
end
end
end
# #select_for_reading?
def select_for_reading?
true
end
# #get_outbound_data_size
def get_outbound_data_size
@outbound_q.inject(0) {|memo,obj| memo += (obj || "").length}
end
end
end
#--------------------------------------------------------------
module EventMachine
class EvmaUDPSocket < DatagramObject
class << self
def create host, port
sd = Socket.new( Socket::AF_INET, Socket::SOCK_DGRAM, 0 )
sd.bind Socket::pack_sockaddr_in( port, host )
EvmaUDPSocket.new sd
end
end
# #eventable_write
# This really belongs in DatagramObject, but there is some UDP-specific stuff.
def eventable_write
40.times {
break if @outbound_q.empty?
begin
data,target = @outbound_q.first
# This damn better be nonblocking.
io.send data.to_s, 0, target
@outbound_q.shift
rescue Errno::EAGAIN
# It's not been observed in testing that we ever get here.
# True to the definition, packets will be accepted and quietly dropped
# if the system is under pressure.
break
rescue EOFError, Errno::ECONNRESET
@close_scheduled = true
@outbound_q.clear
end
}
end
# Proper nonblocking I/O was added to Ruby 1.8.4 in May 2006.
# If we have it, then we can read multiple times safely to improve
# performance.
def eventable_read
begin
if io.respond_to?(:recvfrom_nonblock)
40.times {
data,@return_address = io.recvfrom_nonblock(16384)
EventMachine::event_callback uuid, ConnectionData, data
@return_address = nil
}
else
raise "unimplemented datagram-read operation on this Ruby"
end
rescue Errno::EAGAIN
# no-op
rescue Errno::ECONNRESET, EOFError
@close_scheduled = true
EventMachine::event_callback uuid, ConnectionUnbound, nil
end
end
def send_data data
send_datagram data, @return_address
end
end
end
#--------------------------------------------------------------
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