annotate MoinMoin/server/daemon.py @ 4133:251827af7ddc

Fixed: cannot check for File.Error in same line like checking import of File
author Florian Krupicka <florian.krupicka@googlemail.com>
date Tue, 27 May 2008 18:13:17 +0200
parents e4ebc0bcf5ed
children 441a4136db05
rev   line source
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1 """
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2 Daemon - daemon script and controller
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3
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4 This module is based on twisted.scripts.twistd, modified by Nir Soffer
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5 to work with non Twisted code.
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6
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7 The Daemon class, represents a background process using a pid
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8 file. When you create an instance, the process may be running or not.
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9 After creating an instance, you can call one of its do_xxx() methods.
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10
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11 The DaemonScript class is a script that control a daemon, with a
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12 functionality similar to apachectl. To create a daemon script, create an
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13 instacne and call its run() method.
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14
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15 Typical usage::
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16
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17 # Daemon script
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18 import daemon
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19 import myserver
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20 script = daemon.DaemonScript('myserver', myserver.run, myserver.Config)
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21 script.run()
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22
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23
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24 Copyright (c) 2005 Nir Soffer <nirs@freeshell.org>
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25
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26 Twisted, the Framework of Your Internet
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27 Copyright (c) 2001-2004 Twisted Matrix Laboratories.
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28
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29 Permission is hereby granted, free of charge, to any person obtaining
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30 a copy of this software and associated documentation files (the
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31 "Software"), to deal in the Software without restriction, including
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32 without limitation the rights to use, copy, modify, merge, publish,
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33 distribute, sublicense, and/or sell copies of the Software, and to
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34 permit persons to whom the Software is furnished to do so, subject to
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35 the following conditions:
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36
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37 The above copyright notice and this permission notice shall be
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38 included in all copies or substantial portions of the Software.
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39
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40 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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41 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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42 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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43 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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44 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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45 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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46 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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47 """
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48
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49 import sys, os, errno, signal, time
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50
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51
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52 class Error(Exception):
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53 """ Daemon error """
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54
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55
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56 class Daemon:
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57 """ A background process
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58
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59 Represent a background process, which may be running or not. The
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60 process can be started, stopped, restarted or killed.
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61 """
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62 commandPrefix = 'do_'
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63
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64 def __init__(self, name, function, *args, **kw):
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65 """ Create a daemon
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66
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67 @param name: name of the process (determines pid filename, too)
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68 @param function: the server main function, will block until the
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69 server is done.
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70 @param args: arguments to pass to function
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71 @param kw: keyword arguments to pass to function
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72 """
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73 self.name = name
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74 self.function = function
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75 self.args = args
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76 self.kw = kw
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77 self.pidFile = os.path.abspath(name + '.pid')
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78
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79 # --------------------------------------------------------------------
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80 # Commands
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81
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82 def do_start(self):
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83 """ Start the daemon process
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84
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85 Start will daemonize then block until the server is killed and
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86 then cleanup the pid file on the way out.
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87 """
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88 running, pid = self.status()
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89 if running:
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90 raise Error("another application is running with pid %s "
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91 "(try restart)" % pid)
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92 self.daemonize()
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93 self.writePID()
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94 try:
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95 self.function(*self.args, **self.kw)
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96 finally:
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97 self.removePID()
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98
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99 def do_stop(self):
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100 """ Stop the daemon process
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101
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102 Terminate or raise an error we can't handle here. On success,
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103 the pid file will be cleaned by the terminated process.
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104 """
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105 running, pid = self.status()
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106 if not running:
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107 return self.log("%s is not running" % self.name)
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108 os.kill(pid, signal.SIGINT)
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109
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110 def do_kill(self):
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111 """ Kill the daemon process
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112
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113 Kill or raise an error which we can't handle here. Clean the
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114 pid file for the killed process.
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115 """
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116 running, pid = self.status()
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117 if not running:
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118 return self.log("%s is not running" % self.name)
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119 os.kill(pid, signal.SIGKILL)
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120 self.removePID()
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121
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122 def do_restart(self):
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123 """ stop, wait until pid file gone and start again """
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124 running, pid = self.status()
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125 if not running:
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126 self.log("%s is not running, trying to start" % self.name)
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parents:
diff changeset
127 else:
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parents: 490
diff changeset
128 self.do_stop()
0
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diff changeset
129 timeoutSeconds = 2.0
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parents:
diff changeset
130 start = time.time()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
131 while time.time() - start < timeoutSeconds:
988
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diff changeset
132 running, pid = self.status()
0
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parents:
diff changeset
133 if not running:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
134 break
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
135 time.sleep(0.1)
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parents:
diff changeset
136 else:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
137 raise Error("could not start after %s seconds" % timeoutSeconds)
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
138 self.do_start()
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parents:
diff changeset
139
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parents:
diff changeset
140 # -------------------------------------------------------------------
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parents:
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141 # Private
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142
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Thomas Waldmann <tw-public@gmx.de>
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diff changeset
143 def status(self):
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144 """ Return status tuple (running, pid)
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parents:
diff changeset
145
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Thomas Waldmann <tw-public@gmx.de>
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146 See http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC18
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147 """
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148 running = False
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149 pid = self.readPID()
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150 if pid is not None:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
151 try:
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Thomas Waldmann <tw-public@gmx.de>
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152 os.kill(pid, 0)
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153 running = True
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154 except OSError, err:
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155 if err.errno == errno.ESRCH:
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156 # No such process or security enhancements are causing
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157 # the system to deny its existence.
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158 self.log("removing stale pid file: %s" % self.pidFile)
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159 self.removePID()
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parents:
diff changeset
160 else:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
161 raise
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
162 return running, pid
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
163
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parents:
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164 def readPID(self):
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165 """ Return the pid from the pid file
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diff changeset
166
0
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parents:
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167 If there is no pid file, return None. If pid file is corrupted,
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168 remove it. If its not readable, raise.
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169 """
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170 pid = None
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
171 try:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
172 pid = int(file(self.pidFile).read())
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
173 except IOError, err:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
174 if err.errno != errno.ENOENT:
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
175 raise
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
176 except ValueError:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
177 self.warn("removing corrupted pid file: %s" % self.pidFile)
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
178 self.removePID()
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parents:
diff changeset
179 return pid
988
65dc979761f0 whitespace only and style changes
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diff changeset
180
0
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diff changeset
181 def daemonize(self):
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182 """ Make the current process a daemon
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diff changeset
183
0
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parents:
diff changeset
184 See http://www.erlenstar.demon.co.uk/unix/faq_toc.html#TOC16
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diff changeset
185 """
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
186 if os.fork(): # launch child and...
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
187 os._exit(0) # kill off parent
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
188 os.setsid()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
189 if os.fork(): # launch child and...
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
190 os._exit(0) # kill off parent again.
2792
e4ebc0bcf5ed more octal cosmetics
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 2286
diff changeset
191 os.umask(0077)
988
65dc979761f0 whitespace only and style changes
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parents: 490
diff changeset
192 null = os.open('/dev/null', os.O_RDWR)
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
193 for i in range(3):
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
194 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
195 os.dup2(null, i)
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parents:
diff changeset
196 except OSError, e:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
197 if e.errno != errno.EBADF:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
198 raise
988
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
diff changeset
199 os.close(null)
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
200
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
201 def writePID(self):
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
202 pid = str(os.getpid())
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
203 open(self.pidFile, 'wb').write(pid)
988
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
diff changeset
204
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
205 def removePID(self):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
206 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
207 os.remove(self.pidFile)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
208 except OSError, err:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
209 if err.errno != errno.ENOENT:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
210 raise
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
211
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
212 def warn(self, message):
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Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
213 self.log('warning: %s' % message)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
214
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
215 def log(self, message):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
216 """ TODO: does it work after daemonize? """
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
217 sys.stderr.write(message + '\n')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
218
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
219
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
220 class DaemonScript(Daemon):
2286
01f05e74aa9c Big PEP8 and whitespace cleanup
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 988
diff changeset
221 """ A script controlling a daemon
01f05e74aa9c Big PEP8 and whitespace cleanup
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 988
diff changeset
222
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
223 TODO: add --pid-dir option?
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
224 """
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
225
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
226 def run(self):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
227 """ Check commandline arguments and run a command """
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
228 args = len(sys.argv)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
229 if args == 1:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
230 self.usage('nothing to do')
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
231 elif args > 2:
988
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
diff changeset
232 self.usage("too many arguments")
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
233 try:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
234 command = sys.argv[1]
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
235 func = getattr(self, self.commandPrefix + command)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
236 func()
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
237 except AttributeError:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
238 self.usage('unknown command %r' % command)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
239 except Exception, why:
988
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
diff changeset
240 sys.exit("error: %s" % str(why))
0
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
241
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
242 def usage(self, message):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
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parents:
diff changeset
243 sys.stderr.write('error: %s\n' % message)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
244 sys.stderr.write(self.help())
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
245 sys.exit(1)
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
246
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
247 def help(self):
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
248 return """
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
249 %(name)s - MoinMoin daemon
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
250
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
251 usage: %(name)s command
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
252
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
253 commands:
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
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254 start start the server
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
255 stop stop the server
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
256 restart stop then start the server
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
257 kill kill the server
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
diff changeset
258
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
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259 @copyright: 2004-2005 Thomas Waldmann, Nir Soffer
77665d8e2254 tag of nonpublic@localhost--archive/moin--enterprise--1.5--base-0
Thomas Waldmann <tw-public@gmx.de>
parents:
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260 @license: GNU GPL, see COPYING for details.
988
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
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261 """ % {
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
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262 'name': self.name,
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
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263 }
65dc979761f0 whitespace only and style changes
Thomas Waldmann <tw AT waldmann-edv DOT de>
parents: 490
diff changeset
264