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| | # -*- encoding: binary -*-
# :enddoc:
require 'rainbows/ev_core'
module Rainbows
module Rev
class Client < ::Rev::IO
include Rainbows::ByteSlice
include Rainbows::EvCore
include Rainbows::Response
G = Rainbows::G
HH = Rack::Utils::HeaderHash
def initialize(io)
CONN[self] = false
super(io)
post_init
@deferred_bodies = [] # for (fast) regular files only
end
def quit
super
close if @deferred_bodies.empty? && @_write_buffer.empty?
end
# override the ::Rev::IO#write method try to write directly to the
# kernel socket buffers to avoid an extra userspace copy if
# possible.
def write(buf)
if @_write_buffer.empty?
begin
w = @_io.write_nonblock(buf)
if w == Rack::Utils.bytesize(buf)
return on_write_complete
end
# we never care for the return value, but yes, we may return
# a "fake" short write from super(buf) if anybody cares.
buf = byte_slice(buf, w..-1)
rescue Errno::EAGAIN
break # fall through to super(buf)
rescue
return close
end while true
end
super(buf)
end
# queued, optional response bodies, it should only be unpollable "fast"
# devices where read(2) is uninterruptable. Unfortunately, NFS and ilk
# are also part of this. We'll also stick DeferredResponse bodies in
# here to prevent connections from being closed on us.
def defer_body(io, out_headers)
@deferred_bodies << io
schedule_write unless out_headers # triggers a write
end
def timeout?
@_write_buffer.empty? && @deferred_bodies.empty? and close.nil?
end
def rev_write_response(response, out)
status, headers, body = response
body.respond_to?(:to_path) or
return write_response(self, response, out)
headers = HH.new(headers)
io = body_to_io(body)
st = io.stat
if st.socket? || st.pipe?
do_chunk = !!(headers['Transfer-Encoding'] =~ %r{\Achunked\z}i)
do_chunk = false if headers.delete('X-Rainbows-Autochunk') == 'no'
# too tricky to support keepalive/pipelining when a response can
# take an indeterminate amount of time here.
if out.nil?
do_chunk = false
else
out[0] = CONN_CLOSE
end
# we only want to attach to the Rev::Loop belonging to the
# main thread in Ruby 1.9
io = DeferredResponse.new(io, self, do_chunk, body).
attach(Server::LOOP)
elsif st.file?
headers.delete('Transfer-Encoding')
headers['Content-Length'] ||= st.size.to_s
io = to_sendfile(io)
else # char/block device, directory, whatever... nobody cares
return write_response(self, response, out)
end
defer_body(io, out)
write_header(self, response, out)
end
def app_call
begin
KATO.delete(self)
@env[RACK_INPUT] = @input
@env[REMOTE_ADDR] = @remote_addr
response = APP.call(@env.update(RACK_DEFAULTS))
alive = @hp.keepalive? && G.alive
out = [ alive ? CONN_ALIVE : CONN_CLOSE ] if @hp.headers?
rev_write_response(response, out)
if alive
@env.clear
@hp.reset
@state = :headers
# keepalive requests are always body-less, so @input is unchanged
@hp.headers(@env, @buf) and next
KATO[self] = Time.now
else
quit
end
return
end while true
end
def on_write_complete
if body = @deferred_bodies[0]
# no socket or pipes, body must be a regular file to continue here
return if DeferredResponse === body
begin
rev_sendfile(body)
rescue EOFError # expected at file EOF
@deferred_bodies.shift
body.close
close if :close == @state && @deferred_bodies.empty?
rescue => e
handle_error(e)
end
else
close if :close == @state
end
end
def on_close
while f = @deferred_bodies.shift
DeferredResponse === f or f.close
end
CONN.delete(self)
end
end # module Client
end # module Rev
end # module Rainbows
|