1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
| | # -*- encoding: binary -*-
require 'rev'
Rev::VERSION >= '0.3.0' or abort 'rev >= 0.3.0 is required'
require 'rainbows/ev_core'
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) 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 \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.
module Rev
include Base
class Client < ::Rev::IO
include Rainbows::EvCore
G = Rainbows::G
def initialize(io)
G.cur += 1
super(io)
post_init
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)
@deferred_bodies << io
on_write_complete unless @hp.headers? # triggers a write
end
def app_call
begin
(@env[RACK_INPUT] = @input).rewind
alive = @hp.keepalive?
@env[REMOTE_ADDR] = @remote_addr
response = G.app.call(@env.update(RACK_DEFAULTS))
alive &&= G.alive
out = [ alive ? CONN_ALIVE : CONN_CLOSE ] if @hp.headers?
DeferredResponse.write(self, 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
else
quit
end
return
end while true
end
def on_write_complete
if body = @deferred_bodies.first
return if DeferredResponse === body
begin
begin
write(body.sysread(CHUNK_SIZE))
rescue EOFError # expected at file EOF
@deferred_bodies.shift
body.close
close if :close == @state && @deferred_bodies.empty?
end
rescue Object => e
handle_error(e)
end
else
close if :close == @state
end
end
def on_close
G.cur -= 1
end
end
class Server < ::Rev::IO
G = Rainbows::G
def on_readable
return if G.cur >= G.max
begin
Client.new(@_io.accept_nonblock).attach(::Rev::Loop.default)
rescue Errno::EAGAIN, Errno::ECONNABORTED
end
end
end
class DeferredResponse < ::Rev::IO
include Unicorn
include Rainbows::Const
G = Rainbows::G
def self.defer!(client, response, out)
body = response.last
headers = Rack::Utils::HeaderHash.new(response[1])
# to_io is not part of the Rack spec, but make an exception
# here since we can't get here without checking to_path first
io = body.to_io if body.respond_to?(:to_io)
io ||= ::IO.new($1.to_i) if body.to_path =~ %r{\A/dev/fd/(\d+)\z}
io ||= File.open(body.to_path, 'rb')
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
io = new(io, client, do_chunk, body).attach(::Rev::Loop.default)
elsif st.file?
headers.delete('Transfer-Encoding')
headers['Content-Length'] ||= st.size.to_s
else # char/block device, directory, whatever... nobody cares
return response
end
client.defer_body(io)
[ response.first, headers.to_hash, [] ]
end
def self.write(client, response, out)
response.last.respond_to?(:to_path) and
response = defer!(client, response, out)
HttpResponse.write(client, response, out)
end
def initialize(io, client, do_chunk, body)
super(io)
@client, @do_chunk, @body = client, do_chunk, body
end
def on_read(data)
@do_chunk and @client.write(sprintf("%x\r\n", data.size))
@client.write(data)
@do_chunk and @client.write("\r\n")
end
def on_close
@do_chunk and @client.write("0\r\n\r\n")
@client.quit
@body.respond_to?(:close) and @body.close
end
end
# This timer handles the fchmod heartbeat to prevent our master
# from killing us.
class Heartbeat < ::Rev::TimerWatcher
G = Rainbows::G
def initialize(tmp)
@m, @tmp = 0, tmp
super(1, true)
end
def on_timer
@tmp.chmod(@m = 0 == @m ? 1 : 0)
exit if (! G.alive && G.cur <= 0)
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)
rloop = ::Rev::Loop.default
Heartbeat.new(worker.tmp).attach(rloop)
LISTENERS.map! { |s| Server.new(s).attach(rloop) }
rloop.run
end
end
end
|