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
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
| | # -*- 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) 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 Unicorn
include Rainbows::Const
G = Rainbows::G
# 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.
attr_reader :deferred_bodies
def initialize(io)
G.cur += 1
super(io)
@remote_addr = ::TCPSocket === io ? io.peeraddr.last : LOCALHOST
@env = {}
@hp = HttpParser.new
@state = :headers # [ :body [ :trailers ] ] :app_call :close
@buf = ""
@deferred_bodies = [] # for (fast) regular files only
end
# graceful exit, like SIGQUIT
def quit
@deferred_bodies.clear
@state = :close
end
def handle_error(e)
quit
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)
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
@state = :close
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
end
rescue Object => e
handle_error(e)
end
else
close if :close == @state
end
end
def on_close
G.cur -= 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::G
def on_readable
return if G.cur >= G.max
begin
Client.new(@_io.accept_nonblock).attach(::Rev::Loop.default)
rescue Errno::EAGAIN, Errno::ECONNBORTED
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(File.expand_path(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.
out[0] = CONN_CLOSE
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.deferred_bodies << 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
|