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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'
module Rainbows
# 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 EventMachine
include Base
class Client < EM::Connection # :nodoc: all
include Rainbows::EvCore
include Rainbows::Response
G = Rainbows::G
def initialize(io)
@_io = io
@body = nil
end
alias write send_data
alias receive_data on_read
def quit
super
close_connection_after_writing
end
def app_call
set_comm_inactivity_timeout 0
begin
@env[RACK_INPUT] = @input
@env[REMOTE_ADDR] = @remote_addr
@env[ASYNC_CALLBACK] = method(:em_write_response)
# we're not sure if anybody uses this, but Thin sets it, too
@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
out = [ alive ? CONN_ALIVE : CONN_CLOSE ] if @hp.headers?
em_write_response(response, out, alive)
if alive
@env.clear
@hp.reset
@state = :headers
# keepalive requests are always body-less, so @input is unchanged
@hp.headers(@env, @buf) and next
set_comm_inactivity_timeout G.kato
end
return
end while true
end
def em_write_response(response, out = [ CONN_CLOSE ], alive = false)
@body = body = response[2]
if body.respond_to?(:errback) && body.respond_to?(:callback)
body.callback { quit }
body.errback { quit }
write_header(self, response, out)
write_body_each(self, body)
return
elsif ! body.respond_to?(:to_path)
write_response(self, response, out)
quit unless alive
return
end
headers = Rack::Utils::HeaderHash.new(response[1])
io = body_to_io(body)
st = io.stat
if st.file?
headers.delete('Transfer-Encoding')
headers['Content-Length'] ||= st.size.to_s
write_header(self, [ response[0], headers ], out)
stream = stream_file_data(body.to_path)
stream.callback { quit } unless alive
elsif st.socket? || st.pipe?
do_chunk = !!(headers['Transfer-Encoding'] =~ %r{\Achunked\z}i)
do_chunk = false if headers.delete('X-Rainbows-Autochunk') == 'no'
if out.nil?
do_chunk = false
else
out[0] = CONN_CLOSE
end
write_header(self, [ response[0], headers ], out)
if do_chunk
EM.watch(io, ResponseChunkPipe, self).notify_readable = true
else
EM.enable_proxy(EM.attach(io, ResponsePipe, self), self, 16384)
end
else
write_response(self, response, out)
end
end
def unbind
async_close = @env[ASYNC_CLOSE] and async_close.succeed
@body.respond_to?(:fail) and @body.fail
@_io.close
end
end
module ResponsePipe # :nodoc: all
def initialize(client)
@client = client
end
def unbind
@io.close
@client.quit
end
end
module ResponseChunkPipe # :nodoc: all
include ResponsePipe
def unbind
@client.write("0\r\n\r\n")
super
end
def notify_readable
begin
data = begin
@io.read_nonblock(16384)
rescue Errno::EINTR
retry
rescue Errno::EAGAIN
return
rescue EOFError
detach
return
end
@client.send_data(sprintf("%x\r\n", data.size))
@client.send_data(data)
@client.send_data("\r\n")
end while true
end
end
module Server # :nodoc: all
def close
detach
@io.close
end
def notify_readable
return if CUR.size >= MAX
io = Rainbows.accept(@io) or return
sig = EM.attach_fd(io.fileno, false)
CUR[sig] = CL.new(sig, io)
end
end
# Middleware that will run the app dispatch in a separate thread.
# This middleware is automatically loaded by Rainbows! when using
# EventMachine and if the app responds to the +deferred?+ method.
class TryDefer < Struct.new(:app) # :nodoc: all
def initialize(app)
# the entire app becomes multithreaded, even the root (non-deferred)
# thread since any thread can share processes with others
Const::RACK_DEFAULTS['rack.multithread'] = true
super
end
def call(env)
if app.deferred?(env)
EM.defer(proc { catch(:async) { app.call(env) } },
env[EvCore::ASYNC_CALLBACK])
# all of the async/deferred stuff breaks Rack::Lint :<
nil
else
app.call(env)
end
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
end
|