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| | # -*- encoding: binary -*-
require 'eventmachine'
EM::VERSION >= '0.12.10' or abort 'eventmachine 0.12.10 is required'
require 'rainbows/ev_core'
# Implements a basic single-threaded event model with
# {EventMachine}[http://rubyeventmachine.com/]. It is capable of
# handling thousands of simultaneous client connections, but with only
# a single-threaded app dispatch. It is suited for slow clients,
# and can work with slow applications via asynchronous libraries such as
# {async_sinatra}[http://github.com/raggi/async_sinatra],
# {Cramp}[http://m.onkey.org/2010/1/7/introducing-cramp],
# and {rack-fiber_pool}[http://github.com/mperham/rack-fiber_pool].
#
# It does not require your Rack application to be thread-safe,
# reentrancy is only required for the DevFdResponse body
# generator.
#
# Compatibility: Whatever \EventMachine ~> 0.12.10 and Unicorn both
# support, currently Ruby 1.8/1.9.
#
# This model is compatible with users of "async.callback" in the Rack
# environment such as
# {async_sinatra}[http://github.com/raggi/async_sinatra].
#
# For a complete asynchronous framework,
# {Cramp}[http://m.onkey.org/2010/1/7/introducing-cramp] is fully
# supported when using this concurrency model.
#
# This model is fully-compatible with
# {rack-fiber_pool}[http://github.com/mperham/rack-fiber_pool]
# which allows each request to run inside its own \Fiber after
# all request processing is complete.
#
# Merb (and other frameworks/apps) supporting +deferred?+ execution as
# documented at http://brainspl.at/articles/2008/04/18/deferred-requests-with-merb-ebb-and-thin
# will also get the ability to conditionally defer request processing
# to a separate thread.
#
# This model does not implement as streaming "rack.input" which allows
# the Rack application to process data as it arrives. This means
# "rack.input" will be fully buffered in memory or to a temporary file
# before the application is entered.
module Rainbows::EventMachine
include Rainbows::Base
autoload :ResponsePipe, 'rainbows/event_machine/response_pipe'
autoload :ResponseChunkPipe, 'rainbows/event_machine/response_chunk_pipe'
autoload :TryDefer, 'rainbows/event_machine/try_defer'
class Client < EM::Connection # :nodoc: all
attr_writer :body
include Rainbows::EvCore
def initialize(io)
@_io = io
@body = nil
end
alias write send_data
def receive_data(data)
# To avoid clobbering the current streaming response
# (often a static file), we do not attempt to process another
# request on the same connection until the first is complete
if @body
@buf << data
@_io.shutdown(Socket::SHUT_RD) if @buf.size > 0x1c000
EM.next_tick { receive_data('') }
else
on_read(data)
end
end
def quit
super
close_connection_after_writing
end
def app_call
set_comm_inactivity_timeout 0
@env[RACK_INPUT] = @input
@env[REMOTE_ADDR] = @_io.kgio_addr
@env[ASYNC_CALLBACK] = method(:em_write_response)
@env[ASYNC_CLOSE] = EM::DefaultDeferrable.new
response = catch(:async) { APP.call(@env.update(RACK_DEFAULTS)) }
# too tricky to support pipelining with :async since the
# second (pipelined) request could be a stuck behind a
# long-running async response
(response.nil? || -1 == response[0]) and return @state = :close
alive = @hp.keepalive? && G.alive && G.kato > 0
em_write_response(response, alive)
if alive
@env.clear
@hp.reset
@state = :headers
if @buf.empty?
set_comm_inactivity_timeout(G.kato)
else
EM.next_tick { receive_data('') }
end
end
end
def em_write_response(response, alive = false)
status, headers, body = response
if @hp.headers?
headers = HH.new(headers)
headers[CONNECTION] = alive ? KEEP_ALIVE : CLOSE
else
headers = nil
end
if body.respond_to?(:errback) && body.respond_to?(:callback)
@body = body
body.callback { quit }
body.errback { quit }
# async response, this could be a trickle as is in comet-style apps
headers[CONNECTION] = CLOSE if headers
alive = true
elsif body.respond_to?(:to_path)
st = File.stat(path = body.to_path)
if st.file?
write(response_header(status, headers)) if headers
@body = stream_file_data(path)
@body.errback do
body.close if body.respond_to?(:close)
quit
end
@body.callback do
body.close if body.respond_to?(:close)
@body = nil
alive ? receive_data('') : quit
end
return
elsif st.socket? || st.pipe?
@body = io = body_to_io(body)
chunk = stream_response_headers(status, headers) if headers
m = chunk ? ResponseChunkPipe : ResponsePipe
return EM.watch(io, m, self, alive, body).notify_readable = true
end
# char or block device... WTF? fall through to body.each
end
write(response_header(status, headers)) if headers
write_body_each(self, body)
quit unless alive
end
def unbind
async_close = @env[ASYNC_CLOSE] and async_close.succeed
@body.respond_to?(:fail) and @body.fail
begin
@_io.close
rescue Errno::EBADF
# EventMachine's EventableDescriptor::Close() may close
# the underlying file descriptor without invalidating the
# associated IO object on errors, so @_io.closed? isn't
# sufficient.
end
end
end
module Server # :nodoc: all
def close
detach
@io.close
end
def notify_readable
return if CUR.size >= MAX
io = @io.kgio_tryaccept or return
sig = EM.attach_fd(io.fileno, false)
CUR[sig] = CL.new(sig, io)
end
end
def init_worker_process(worker) # :nodoc:
Rainbows::Response.setup(Rainbows::EventMachine::Client)
super
end
# runs inside each forked worker, this sits around and waits
# for connections and doesn't die until the parent dies (or is
# given a INT, QUIT, or TERM signal)
def worker_loop(worker) # :nodoc:
init_worker_process(worker)
G.server.app.respond_to?(:deferred?) and
G.server.app = TryDefer[G.server.app]
# enable them both, should be non-fatal if not supported
EM.epoll
EM.kqueue
logger.info "#@use: epoll=#{EM.epoll?} kqueue=#{EM.kqueue?}"
client_class = Rainbows.const_get(@use).const_get(:Client)
Server.const_set(:MAX, worker_connections + LISTENERS.size)
Server.const_set(:CL, client_class)
client_class.const_set(:APP, G.server.app)
EM.run {
conns = EM.instance_variable_get(:@conns) or
raise RuntimeError, "EM @conns instance variable not accessible!"
Server.const_set(:CUR, conns)
EM.add_periodic_timer(1) do
unless G.tick
conns.each_value { |c| client_class === c and c.quit }
EM.stop if conns.empty? && EM.reactor_running?
end
end
LISTENERS.map! do |s|
EM.watch(s, Server) { |c| c.notify_readable = true }
end
}
end
end
|