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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
# fast applications (applications that do not have slow network
# dependencies) or applications that use DevFdResponse for deferrable
# response bodies. 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].
#
# 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
include Rainbows::EvCore
G = Rainbows::G
# Apps may return this Rack response: AsyncResponse = [ -1, {}, [] ]
ASYNC_CALLBACK = 'async.callback'.freeze
def initialize(io)
@_io = io
end
alias write send_data
alias receive_data on_read
def quit
super
close_connection_after_writing
end
def app_call
begin
(@env[RACK_INPUT] = @input).rewind
alive = @hp.keepalive?
@env[REMOTE_ADDR] = @remote_addr
@env[ASYNC_CALLBACK] = method(:response_write)
response = catch(:async) { G.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.first) and return @state = :close
alive &&= G.alive
out = [ alive ? CONN_ALIVE : CONN_CLOSE ] if @hp.headers?
response_write(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
end
return
end while true
end
def response_write(response, out = [], alive = false)
body = response.last
unless body.respond_to?(:to_path)
HttpResponse.write(self, response, out)
quit unless alive
return
end
headers = Rack::Utils::HeaderHash.new(response[1])
path = body.to_path
io = body.to_io if body.respond_to?(:to_io)
io ||= IO.new($1.to_i) if path =~ %r{\A/dev/fd/(\d+)\z}
io ||= File.open(path, 'rb') # could be a named pipe
st = io.stat
if st.file?
headers.delete('Transfer-Encoding')
headers['Content-Length'] ||= st.size.to_s
response = [ response.first, headers.to_hash, [] ]
HttpResponse.write(self, response, out)
stream = stream_file_data(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
response = [ response.first, headers.to_hash, [] ]
HttpResponse.write(self, response, out)
if do_chunk
EM.watch(io, ResponseChunkPipe, self).notify_readable = true
else
EM.enable_proxy(EM.attach(io, ResponsePipe, self), self)
end
else
HttpResponse.write(self, response, out)
end
end
def unbind
@_io.close
end
end
module ResponsePipe
def initialize(client)
@client = client
end
def unbind
@io.close
@client.quit
end
end
module ResponseChunkPipe
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
def initialize(conns)
@limit = Rainbows::G.max + HttpServer::LISTENERS.size
@em_conns = conns
end
def close
detach
@io.close
end
def notify_readable
return if @em_conns.size >= @limit
begin
io = @io.accept_nonblock
sig = EM.attach_fd(io.fileno, false)
@em_conns[sig] = Client.new(sig, io)
rescue Errno::EAGAIN, Errno::ECONNABORTED
end
end
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)
init_worker_process(worker)
m = 0
# enable them both, should be non-fatal if not supported
EM.epoll
EM.kqueue
logger.info "EventMachine: epoll=#{EM.epoll?} kqueue=#{EM.kqueue?}"
EM.run {
conns = EM.instance_variable_get(:@conns) or
raise RuntimeError, "EM @conns instance variable not accessible!"
EM.add_periodic_timer(1) do
worker.tmp.chmod(m = 0 == m ? 1 : 0)
unless G.alive
conns.each_value { |client| Client === client and client.quit }
EM.stop if conns.empty? && EM.reactor_running?
end
end
LISTENERS.map! do |s|
EM.watch(s, Server, conns) { |c| c.notify_readable = true }
end
}
end
end
end
|