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| | # -*- encoding: binary -*-
require 'rev'
# workaround revactor 0.1.4 still using the old Rev::Buffer
# ref: http://rubyforge.org/pipermail/revactor-talk/2009-October/000034.html
defined?(Rev::Buffer) or Rev::Buffer = IO::Buffer
module Rainbows
# Implements a basic single-threaded event model with
# {Rev}[http://rev.rubyforge.org/]. 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). It does not require your Rack application to
# be reentrant or thread-safe.
#
# Compatibility: Whatever \Rev itself supports, currently Ruby
# 1.8/1.9.
#
# 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.
#
# Caveats: this model can buffer all output for slow clients in
# memory. This can be a problem if your application generates large
# responses (including static files served with Rack) as it will cause
# the memory footprint of your process to explode. If your workers
# seem to be eating a lot of memory from this, consider the
# {mall}[http://bogomips.org/mall/] library which allows access to the
# mallopt(3) function from Ruby.
module Rev
# global vars because class/instance variables are confusing me :<
# this struct is only accessed inside workers and thus private to each
G = Struct.new(:nr, :max, :logger, :alive, :app).new
include Base
class Client < ::Rev::IO
include Unicorn
include Rainbows::Const
G = Rainbows::Rev::G
def initialize(io)
G.nr += 1
super(io)
@remote_addr = ::TCPSocket === io ? io.peeraddr.last : LOCALHOST
@env = {}
@hp = HttpParser.new
@state = :headers # [ :body [ :trailers ] ] :app_call :close
@buf = ""
end
def handle_error(e)
msg = case e
when EOFError,Errno::ECONNRESET,Errno::EPIPE,Errno::EINVAL,Errno::EBADF
ERROR_500_RESPONSE
when HttpParserError # try to tell the client they're bad
ERROR_400_RESPONSE
else
G.logger.error "Read error: #{e.inspect}"
G.logger.error e.backtrace.join("\n")
ERROR_500_RESPONSE
end
write(msg)
ensure
@state = :close
end
def app_call
@input.rewind
@env[RACK_INPUT] = @input
@env[REMOTE_ADDR] = @remote_addr
response = G.app.call(@env.update(RACK_DEFAULTS))
alive = @hp.keepalive? && G.alive
out = [ alive ? CONN_ALIVE : CONN_CLOSE ] if @hp.headers?
HttpResponse.write(self, response, out)
if alive
@env.clear
@hp.reset
@state = :headers
else
@state = :close
end
end
def on_write_complete
:close == @state and close
end
def on_close
G.nr -= 1
end
def tmpio
io = Util.tmpio
def io.size
# already sync=true at creation, so no need to flush before stat
stat.size
end
io
end
# TeeInput doesn't map too well to this right now...
def on_read(data)
case @state
when :headers
@hp.headers(@env, @buf << data) or return
@state = :body
len = @hp.content_length
if len == 0
@input = HttpRequest::NULL_IO
app_call # common case
else # nil or len > 0
# since we don't do streaming input, we have no choice but
# to take over 100-continue handling from the Rack application
if @env[HTTP_EXPECT] =~ /\A100-continue\z/i
write(EXPECT_100_RESPONSE)
@env.delete(HTTP_EXPECT)
end
@input = len && len <= MAX_BODY ? StringIO.new("") : tmpio
@hp.filter_body(@buf2 = @buf.dup, @buf)
@input << @buf2
on_read("")
end
when :body
if @hp.body_eof?
@state = :trailers
on_read(data)
elsif data.size > 0
@hp.filter_body(@buf2, @buf << data)
@input << @buf2
on_read("")
end
when :trailers
@hp.trailers(@env, @buf << data) and app_call
end
rescue Object => e
handle_error(e)
end
end
class Server < ::Rev::IO
G = Rainbows::Rev::G
def on_readable
return if G.nr >= G.max
begin
Client.new(@_io.accept_nonblock).attach(::Rev::Loop.default)
rescue Errno::EAGAIN, Errno::ECONNBORTED
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)
G.nr = 0
G.max = worker_connections
G.alive = true
G.logger = logger
G.app = app
LISTENERS.map! { |s| Server.new(s).attach(::Rev::Loop.default) }
::Rev::Loop.default.run
end
end
end
|