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
|
#
# utils.rb -- Miscellaneous utilities
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: utils.rb,v 1.10 2003/02/16 22:22:54 gotoyuzo Exp $
require 'socket'
require 'io/nonblock'
require 'etc'
module WEBrick
module Utils
##
# Sets IO operations on +io+ to be non-blocking
def set_non_blocking(io)
io.nonblock = true if io.respond_to?(:nonblock=)
end
module_function :set_non_blocking
##
# Sets the close on exec flag for +io+
def set_close_on_exec(io)
io.close_on_exec = true if io.respond_to?(:close_on_exec=)
end
module_function :set_close_on_exec
##
# Changes the process's uid and gid to the ones of +user+
def su(user)
if pw = Etc.getpwnam(user)
Process::initgroups(user, pw.gid)
Process::Sys::setgid(pw.gid)
Process::Sys::setuid(pw.uid)
else
warn("WEBrick::Utils::su doesn't work on this platform")
end
end
module_function :su
##
# The server hostname
def getservername
host = Socket::gethostname
begin
Socket::gethostbyname(host)[0]
rescue
host
end
end
module_function :getservername
##
# Creates TCP server sockets bound to +address+:+port+ and returns them.
#
# It will create IPV4 and IPV6 sockets on all interfaces.
def create_listeners(address, port)
unless port
raise ArgumentError, "must specify port"
end
sockets = Socket.tcp_server_sockets(address, port)
sockets = sockets.map {|s|
s.autoclose = false
ts = TCPServer.for_fd(s.fileno)
s.close
ts
}
return sockets
end
module_function :create_listeners
##
# Characters used to generate random strings
RAND_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"0123456789" +
"abcdefghijklmnopqrstuvwxyz"
##
# Generates a random string of length +len+
def random_string(len)
rand_max = RAND_CHARS.bytesize
ret = ""
len.times{ ret << RAND_CHARS[rand(rand_max)] }
ret
end
module_function :random_string
###########
require "thread"
require "timeout"
require "singleton"
##
# Class used to manage timeout handlers across multiple threads.
#
# Timeout handlers should be managed by using the class methods which are
# synchronized.
#
# id = TimeoutHandler.register(10, Timeout::Error)
# begin
# sleep 20
# puts 'foo'
# ensure
# TimeoutHandler.cancel(id)
# end
#
# will raise Timeout::Error
#
# id = TimeoutHandler.register(10, Timeout::Error)
# begin
# sleep 5
# puts 'foo'
# ensure
# TimeoutHandler.cancel(id)
# end
#
# will print 'foo'
#
class TimeoutHandler
include Singleton
class Thread < ::Thread; end
##
# Mutex used to synchronize access across threads
TimeoutMutex = Mutex.new # :nodoc:
##
# Registers a new timeout handler
#
# +time+:: Timeout in seconds
# +exception+:: Exception to raise when timeout elapsed
def TimeoutHandler.register(seconds, exception)
TimeoutMutex.synchronize{
instance.register(Thread.current, Time.now + seconds, exception)
}
end
##
# Cancels the timeout handler +id+
def TimeoutHandler.cancel(id)
TimeoutMutex.synchronize{
instance.cancel(Thread.current, id)
}
end
##
# Creates a new TimeoutHandler. You should use ::register and ::cancel
# instead of creating the timeout handler directly.
def initialize
@timeout_info = Hash.new
@watcher = Thread.start{
to_interrupt = []
while true
now = Time.now
wakeup = nil
to_interrupt.clear
TimeoutMutex.synchronize{
@timeout_info.each {|thread, ary|
next unless ary
ary.each{|info|
time, exception = *info
if time < now
to_interrupt.push [thread, info.object_id, exception]
elsif !wakeup || time < wakeup
wakeup = time
end
}
}
}
to_interrupt.each {|arg| interrupt(*arg)}
if !wakeup
sleep
elsif (wakeup -= now) > 0
sleep(wakeup)
end
end
}
end
##
# Interrupts the timeout handler +id+ and raises +exception+
def interrupt(thread, id, exception)
TimeoutMutex.synchronize{
if cancel(thread, id) && thread.alive?
thread.raise(exception, "execution timeout")
end
}
end
##
# Registers a new timeout handler
#
# +time+:: Timeout in seconds
# +exception+:: Exception to raise when timeout elapsed
def register(thread, time, exception)
@timeout_info[thread] ||= Array.new
@timeout_info[thread] << (info = [time, exception])
begin
@watcher.wakeup
rescue ThreadError
end
return info.object_id
end
##
# Cancels the timeout handler +id+
def cancel(thread, id)
if ary = @timeout_info[thread]
ary.delete_if{|info| info.object_id == id }
if ary.empty?
@timeout_info.delete(thread)
end
return true
end
return false
end
end
##
# Executes the passed block and raises +exception+ if execution takes more
# than +seconds+.
#
# If +seconds+ is zero or nil, simply executes the block
def timeout(seconds, exception=Timeout::Error)
return yield if seconds.nil? or seconds.zero?
# raise ThreadError, "timeout within critical session" if Thread.critical
id = TimeoutHandler.register(seconds, exception)
begin
yield(seconds)
ensure
TimeoutHandler.cancel(id)
end
end
module_function :timeout
end
end
|
