1 # -*- encoding: binary -*-
4 Revactor::VERSION >= '0.1.5' or abort 'revactor 0.1.5 is required'
6 # Enables use of the Actor model through
7 # {Revactor}[http://revactor.org] under Ruby 1.9. It spawns one
8 # long-lived Actor for every listen socket in the process and spawns a
9 # new Actor for every client connection accept()-ed.
10 # +worker_connections+ will limit the number of client Actors we have
11 # running at any one time.
13 # Applications using this model are required to be reentrant, but do
14 # not have to worry about race conditions unless they use threads
15 # internally. \Rainbows! does not spawn threads under this model.
16 # Multiple instances of the same app may run in the same address space
17 # sequentially (but at interleaved points). Any network dependencies
18 # in the application using this model should be implemented using the
19 # \Revactor library as well, to take advantage of the networking
20 # concurrency features this model provides.
21 module Rainbows::Revactor
26 autoload :Proxy, 'rainbows/revactor/proxy'
28 include Rainbows::Base
29 LOCALHOST = Unicorn::HttpRequest::LOCALHOST
30 TCP = ::Revactor::TCP::Socket
32 # once a client is accepted, it is processed in its entirety here
33 # in 3 easy steps: read request, call app, write app response
34 def process_client(client) # :nodoc:
35 io = client.instance_variable_get(:@_io)
36 io.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
38 remote_addr = if TCP === client
44 buf = client.read(*rd_args)
49 buf << client.read(*rd_args) until hp.headers(env, buf)
51 env[CLIENT_IO] = client
52 env[RACK_INPUT] = 0 == hp.content_length ?
53 NULL_IO : TeeInput.new(PartialSocket.new(client), env, hp, buf)
54 env[REMOTE_ADDR] = remote_addr
55 status, headers, body = app.call(env.update(RACK_DEFAULTS))
58 client.write(EXPECT_100_RESPONSE)
59 env.delete(HTTP_EXPECT)
60 status, headers, body = app.call(env)
64 headers = HH.new(headers)
65 range = make_range!(env, status, headers) and status = range.shift
66 env = false unless hp.keepalive? && G.alive && G.kato > 0
67 headers[CONNECTION] = env ? KEEP_ALIVE : CLOSE
68 client.write(response_header(status, headers))
70 write_body(client, body, range)
71 end while env && env.clear && hp.reset.nil?
72 rescue ::Revactor::TCP::ReadError
74 Rainbows::Error.write(io, e)
79 # runs inside each forked worker, this sits around and waits
80 # for connections and doesn't die until the parent dies (or is
81 # given a INT, QUIT, or TERM signal)
82 def worker_loop(worker) #:nodoc:
83 init_worker_process(worker)
84 require 'rainbows/revactor/body'
85 self.class.__send__(:include, Rainbows::Revactor::Body)
86 RD_ARGS[:timeout] = G.kato if G.kato > 0
88 limit = worker_connections
89 actor_exit = Case[:exit, Actor, Object]
91 revactorize_listeners.each do |l, close, accept|
92 Actor.spawn(l, close, accept) do |l, close, accept|
93 Actor.current.trap_exit = true
94 l.controller = l.instance_variable_set(:@receiver, Actor.current)
97 l.disable if l.enabled?
98 logger.info "busy: clients=#{nr} >= limit=#{limit}"
101 f.when(actor_exit) { nr -= 1 }
102 f.after(0.01) {} # another listener could've gotten an exit
106 l.enable unless l.enabled?
109 f.when(actor_exit) { nr -= 1 }
110 f.when(accept) do |_, _, s|
112 Actor.spawn_link(s) { |c| process_client(c) }
116 Rainbows::Error.listen_loop(e)
120 f.when(actor_exit) { nr -= 1 }
125 Actor.sleep 1 while G.tick || nr > 0
127 # ignore, let another worker process take it
130 def revactorize_listeners
134 l = ::Revactor::TCP.listen(s, nil)
135 [ l, T[:tcp_closed, ::Revactor::TCP::Socket],
136 T[:tcp_connection, l, ::Revactor::TCP::Socket] ]
138 l = ::Revactor::UNIX.listen(s)
139 [ l, T[:unix_closed, ::Revactor::UNIX::Socket ],
140 T[:unix_connection, l, ::Revactor::UNIX::Socket] ]
145 # Revactor Sockets do not implement readpartial, so we emulate just
146 # enough to avoid mucking with TeeInput internals. Fortunately
147 # this code is not heavily used so we can usually avoid the overhead
148 # of adding a userspace buffer.
149 class PartialSocket < Struct.new(:socket, :rbuf)
150 def initialize(socket)
151 # IO::Buffer is used internally by Rev which Revactor is based on
152 # so we'll always have it available
153 super(socket, IO::Buffer.new)
156 # Revactor socket reads always return an unspecified amount,
158 def readpartial(length, dst = "")
159 return dst.replace("") if length == 0
161 # always check and return from the userspace buffer first
162 rbuf.size > 0 and return dst.replace(rbuf.read(length))
164 # read off the socket since there was nothing in rbuf
167 # we didn't read too much, good, just return it straight back
168 # to avoid needlessly wasting memory bandwidth
169 tmp.size <= length and return dst.replace(tmp)
171 # ugh, read returned too much
172 rbuf << tmp[length, tmp.size]
173 dst.replace(tmp[0, length])
176 # just proxy any remaining methods TeeInput may use