Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/future/backports/socketserver.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
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1 """Generic socket server classes.
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2
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3 This module tries to capture the various aspects of defining a server:
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4
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5 For socket-based servers:
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6
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7 - address family:
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8 - AF_INET{,6}: IP (Internet Protocol) sockets (default)
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9 - AF_UNIX: Unix domain sockets
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10 - others, e.g. AF_DECNET are conceivable (see <socket.h>
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11 - socket type:
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12 - SOCK_STREAM (reliable stream, e.g. TCP)
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13 - SOCK_DGRAM (datagrams, e.g. UDP)
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14
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15 For request-based servers (including socket-based):
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16
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17 - client address verification before further looking at the request
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18 (This is actually a hook for any processing that needs to look
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19 at the request before anything else, e.g. logging)
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20 - how to handle multiple requests:
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21 - synchronous (one request is handled at a time)
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22 - forking (each request is handled by a new process)
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23 - threading (each request is handled by a new thread)
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24
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25 The classes in this module favor the server type that is simplest to
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26 write: a synchronous TCP/IP server. This is bad class design, but
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27 save some typing. (There's also the issue that a deep class hierarchy
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28 slows down method lookups.)
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29
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30 There are five classes in an inheritance diagram, four of which represent
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31 synchronous servers of four types:
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32
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33 +------------+
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34 | BaseServer |
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35 +------------+
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36 |
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37 v
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38 +-----------+ +------------------+
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39 | TCPServer |------->| UnixStreamServer |
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40 +-----------+ +------------------+
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41 |
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42 v
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43 +-----------+ +--------------------+
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44 | UDPServer |------->| UnixDatagramServer |
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45 +-----------+ +--------------------+
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46
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47 Note that UnixDatagramServer derives from UDPServer, not from
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48 UnixStreamServer -- the only difference between an IP and a Unix
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49 stream server is the address family, which is simply repeated in both
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50 unix server classes.
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51
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52 Forking and threading versions of each type of server can be created
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53 using the ForkingMixIn and ThreadingMixIn mix-in classes. For
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54 instance, a threading UDP server class is created as follows:
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55
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56 class ThreadingUDPServer(ThreadingMixIn, UDPServer): pass
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57
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58 The Mix-in class must come first, since it overrides a method defined
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59 in UDPServer! Setting the various member variables also changes
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60 the behavior of the underlying server mechanism.
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61
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62 To implement a service, you must derive a class from
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63 BaseRequestHandler and redefine its handle() method. You can then run
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64 various versions of the service by combining one of the server classes
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65 with your request handler class.
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66
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67 The request handler class must be different for datagram or stream
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68 services. This can be hidden by using the request handler
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69 subclasses StreamRequestHandler or DatagramRequestHandler.
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70
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71 Of course, you still have to use your head!
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72
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73 For instance, it makes no sense to use a forking server if the service
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74 contains state in memory that can be modified by requests (since the
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75 modifications in the child process would never reach the initial state
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76 kept in the parent process and passed to each child). In this case,
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77 you can use a threading server, but you will probably have to use
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78 locks to avoid two requests that come in nearly simultaneous to apply
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79 conflicting changes to the server state.
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80
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81 On the other hand, if you are building e.g. an HTTP server, where all
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82 data is stored externally (e.g. in the file system), a synchronous
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83 class will essentially render the service "deaf" while one request is
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84 being handled -- which may be for a very long time if a client is slow
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85 to read all the data it has requested. Here a threading or forking
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86 server is appropriate.
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87
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88 In some cases, it may be appropriate to process part of a request
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89 synchronously, but to finish processing in a forked child depending on
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90 the request data. This can be implemented by using a synchronous
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91 server and doing an explicit fork in the request handler class
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92 handle() method.
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93
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94 Another approach to handling multiple simultaneous requests in an
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95 environment that supports neither threads nor fork (or where these are
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96 too expensive or inappropriate for the service) is to maintain an
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97 explicit table of partially finished requests and to use select() to
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98 decide which request to work on next (or whether to handle a new
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99 incoming request). This is particularly important for stream services
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100 where each client can potentially be connected for a long time (if
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101 threads or subprocesses cannot be used).
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102
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103 Future work:
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104 - Standard classes for Sun RPC (which uses either UDP or TCP)
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105 - Standard mix-in classes to implement various authentication
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106 and encryption schemes
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107 - Standard framework for select-based multiplexing
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108
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109 XXX Open problems:
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110 - What to do with out-of-band data?
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111
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112 BaseServer:
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113 - split generic "request" functionality out into BaseServer class.
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114 Copyright (C) 2000 Luke Kenneth Casson Leighton <lkcl@samba.org>
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115
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116 example: read entries from a SQL database (requires overriding
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117 get_request() to return a table entry from the database).
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118 entry is processed by a RequestHandlerClass.
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119
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120 """
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121
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122 # Author of the BaseServer patch: Luke Kenneth Casson Leighton
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123
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124 # XXX Warning!
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125 # There is a test suite for this module, but it cannot be run by the
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126 # standard regression test.
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127 # To run it manually, run Lib/test/test_socketserver.py.
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128
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129 from __future__ import (absolute_import, print_function)
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130
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131 __version__ = "0.4"
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132
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133
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134 import socket
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135 import select
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136 import sys
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137 import os
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138 import errno
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139 try:
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140 import threading
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141 except ImportError:
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142 import dummy_threading as threading
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143
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144 __all__ = ["TCPServer","UDPServer","ForkingUDPServer","ForkingTCPServer",
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145 "ThreadingUDPServer","ThreadingTCPServer","BaseRequestHandler",
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146 "StreamRequestHandler","DatagramRequestHandler",
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147 "ThreadingMixIn", "ForkingMixIn"]
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148 if hasattr(socket, "AF_UNIX"):
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149 __all__.extend(["UnixStreamServer","UnixDatagramServer",
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150 "ThreadingUnixStreamServer",
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151 "ThreadingUnixDatagramServer"])
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152
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153 def _eintr_retry(func, *args):
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154 """restart a system call interrupted by EINTR"""
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155 while True:
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156 try:
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157 return func(*args)
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158 except OSError as e:
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159 if e.errno != errno.EINTR:
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160 raise
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161
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162 class BaseServer(object):
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163
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164 """Base class for server classes.
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165
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166 Methods for the caller:
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167
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168 - __init__(server_address, RequestHandlerClass)
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169 - serve_forever(poll_interval=0.5)
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170 - shutdown()
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171 - handle_request() # if you do not use serve_forever()
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172 - fileno() -> int # for select()
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173
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174 Methods that may be overridden:
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175
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176 - server_bind()
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177 - server_activate()
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178 - get_request() -> request, client_address
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179 - handle_timeout()
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180 - verify_request(request, client_address)
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181 - server_close()
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182 - process_request(request, client_address)
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183 - shutdown_request(request)
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184 - close_request(request)
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185 - service_actions()
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186 - handle_error()
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187
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188 Methods for derived classes:
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189
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190 - finish_request(request, client_address)
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191
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192 Class variables that may be overridden by derived classes or
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193 instances:
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194
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195 - timeout
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196 - address_family
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197 - socket_type
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198 - allow_reuse_address
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199
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200 Instance variables:
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201
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202 - RequestHandlerClass
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203 - socket
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204
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205 """
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206
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207 timeout = None
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208
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209 def __init__(self, server_address, RequestHandlerClass):
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210 """Constructor. May be extended, do not override."""
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211 self.server_address = server_address
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212 self.RequestHandlerClass = RequestHandlerClass
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213 self.__is_shut_down = threading.Event()
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214 self.__shutdown_request = False
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215
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216 def server_activate(self):
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217 """Called by constructor to activate the server.
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218
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219 May be overridden.
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220
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221 """
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222 pass
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223
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224 def serve_forever(self, poll_interval=0.5):
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225 """Handle one request at a time until shutdown.
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226
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227 Polls for shutdown every poll_interval seconds. Ignores
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228 self.timeout. If you need to do periodic tasks, do them in
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229 another thread.
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230 """
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231 self.__is_shut_down.clear()
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232 try:
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233 while not self.__shutdown_request:
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234 # XXX: Consider using another file descriptor or
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235 # connecting to the socket to wake this up instead of
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236 # polling. Polling reduces our responsiveness to a
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237 # shutdown request and wastes cpu at all other times.
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238 r, w, e = _eintr_retry(select.select, [self], [], [],
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239 poll_interval)
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240 if self in r:
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241 self._handle_request_noblock()
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242
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243 self.service_actions()
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244 finally:
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245 self.__shutdown_request = False
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246 self.__is_shut_down.set()
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247
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248 def shutdown(self):
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249 """Stops the serve_forever loop.
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250
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251 Blocks until the loop has finished. This must be called while
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252 serve_forever() is running in another thread, or it will
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253 deadlock.
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254 """
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255 self.__shutdown_request = True
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256 self.__is_shut_down.wait()
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257
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258 def service_actions(self):
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259 """Called by the serve_forever() loop.
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260
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261 May be overridden by a subclass / Mixin to implement any code that
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262 needs to be run during the loop.
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263 """
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264 pass
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265
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266 # The distinction between handling, getting, processing and
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267 # finishing a request is fairly arbitrary. Remember:
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268 #
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269 # - handle_request() is the top-level call. It calls
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270 # select, get_request(), verify_request() and process_request()
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271 # - get_request() is different for stream or datagram sockets
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272 # - process_request() is the place that may fork a new process
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273 # or create a new thread to finish the request
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274 # - finish_request() instantiates the request handler class;
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275 # this constructor will handle the request all by itself
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276
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277 def handle_request(self):
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278 """Handle one request, possibly blocking.
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279
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280 Respects self.timeout.
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281 """
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282 # Support people who used socket.settimeout() to escape
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283 # handle_request before self.timeout was available.
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284 timeout = self.socket.gettimeout()
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285 if timeout is None:
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286 timeout = self.timeout
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287 elif self.timeout is not None:
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288 timeout = min(timeout, self.timeout)
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289 fd_sets = _eintr_retry(select.select, [self], [], [], timeout)
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290 if not fd_sets[0]:
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291 self.handle_timeout()
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292 return
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293 self._handle_request_noblock()
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294
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295 def _handle_request_noblock(self):
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296 """Handle one request, without blocking.
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297
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298 I assume that select.select has returned that the socket is
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299 readable before this function was called, so there should be
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300 no risk of blocking in get_request().
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301 """
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302 try:
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303 request, client_address = self.get_request()
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304 except socket.error:
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305 return
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306 if self.verify_request(request, client_address):
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307 try:
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308 self.process_request(request, client_address)
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309 except:
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310 self.handle_error(request, client_address)
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311 self.shutdown_request(request)
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312
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313 def handle_timeout(self):
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314 """Called if no new request arrives within self.timeout.
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315
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316 Overridden by ForkingMixIn.
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317 """
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318 pass
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319
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320 def verify_request(self, request, client_address):
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321 """Verify the request. May be overridden.
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322
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323 Return True if we should proceed with this request.
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324
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325 """
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326 return True
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327
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328 def process_request(self, request, client_address):
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329 """Call finish_request.
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330
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331 Overridden by ForkingMixIn and ThreadingMixIn.
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332
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333 """
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334 self.finish_request(request, client_address)
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335 self.shutdown_request(request)
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336
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337 def server_close(self):
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338 """Called to clean-up the server.
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339
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340 May be overridden.
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341
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342 """
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343 pass
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344
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345 def finish_request(self, request, client_address):
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346 """Finish one request by instantiating RequestHandlerClass."""
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347 self.RequestHandlerClass(request, client_address, self)
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348
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349 def shutdown_request(self, request):
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350 """Called to shutdown and close an individual request."""
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351 self.close_request(request)
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352
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353 def close_request(self, request):
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354 """Called to clean up an individual request."""
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355 pass
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356
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357 def handle_error(self, request, client_address):
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358 """Handle an error gracefully. May be overridden.
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359
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360 The default is to print a traceback and continue.
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361
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362 """
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363 print('-'*40)
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364 print('Exception happened during processing of request from', end=' ')
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365 print(client_address)
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366 import traceback
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367 traceback.print_exc() # XXX But this goes to stderr!
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368 print('-'*40)
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369
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370
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371 class TCPServer(BaseServer):
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372
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373 """Base class for various socket-based server classes.
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374
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375 Defaults to synchronous IP stream (i.e., TCP).
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376
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377 Methods for the caller:
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378
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379 - __init__(server_address, RequestHandlerClass, bind_and_activate=True)
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380 - serve_forever(poll_interval=0.5)
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381 - shutdown()
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382 - handle_request() # if you don't use serve_forever()
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383 - fileno() -> int # for select()
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384
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385 Methods that may be overridden:
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386
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387 - server_bind()
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388 - server_activate()
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389 - get_request() -> request, client_address
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390 - handle_timeout()
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391 - verify_request(request, client_address)
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392 - process_request(request, client_address)
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393 - shutdown_request(request)
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394 - close_request(request)
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395 - handle_error()
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396
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397 Methods for derived classes:
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398
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399 - finish_request(request, client_address)
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400
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401 Class variables that may be overridden by derived classes or
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402 instances:
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403
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404 - timeout
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405 - address_family
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406 - socket_type
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407 - request_queue_size (only for stream sockets)
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408 - allow_reuse_address
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409
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410 Instance variables:
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411
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412 - server_address
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413 - RequestHandlerClass
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414 - socket
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415
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416 """
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417
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418 address_family = socket.AF_INET
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419
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420 socket_type = socket.SOCK_STREAM
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421
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422 request_queue_size = 5
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423
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424 allow_reuse_address = False
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425
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426 def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):
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427 """Constructor. May be extended, do not override."""
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428 BaseServer.__init__(self, server_address, RequestHandlerClass)
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429 self.socket = socket.socket(self.address_family,
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430 self.socket_type)
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431 if bind_and_activate:
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432 self.server_bind()
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433 self.server_activate()
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434
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435 def server_bind(self):
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436 """Called by constructor to bind the socket.
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437
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438 May be overridden.
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439
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440 """
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441 if self.allow_reuse_address:
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442 self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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443 self.socket.bind(self.server_address)
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444 self.server_address = self.socket.getsockname()
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445
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446 def server_activate(self):
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447 """Called by constructor to activate the server.
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448
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449 May be overridden.
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450
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451 """
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452 self.socket.listen(self.request_queue_size)
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453
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454 def server_close(self):
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455 """Called to clean-up the server.
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456
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457 May be overridden.
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458
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459 """
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460 self.socket.close()
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461
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462 def fileno(self):
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463 """Return socket file number.
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464
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465 Interface required by select().
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466
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467 """
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468 return self.socket.fileno()
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469
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470 def get_request(self):
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471 """Get the request and client address from the socket.
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472
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473 May be overridden.
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474
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475 """
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476 return self.socket.accept()
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477
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478 def shutdown_request(self, request):
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479 """Called to shutdown and close an individual request."""
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480 try:
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481 #explicitly shutdown. socket.close() merely releases
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482 #the socket and waits for GC to perform the actual close.
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483 request.shutdown(socket.SHUT_WR)
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484 except socket.error:
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485 pass #some platforms may raise ENOTCONN here
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486 self.close_request(request)
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487
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488 def close_request(self, request):
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489 """Called to clean up an individual request."""
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490 request.close()
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491
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492
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493 class UDPServer(TCPServer):
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494
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495 """UDP server class."""
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496
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497 allow_reuse_address = False
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498
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499 socket_type = socket.SOCK_DGRAM
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500
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501 max_packet_size = 8192
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502
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503 def get_request(self):
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504 data, client_addr = self.socket.recvfrom(self.max_packet_size)
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505 return (data, self.socket), client_addr
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506
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507 def server_activate(self):
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508 # No need to call listen() for UDP.
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509 pass
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510
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511 def shutdown_request(self, request):
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512 # No need to shutdown anything.
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513 self.close_request(request)
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514
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515 def close_request(self, request):
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516 # No need to close anything.
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517 pass
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518
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519 class ForkingMixIn(object):
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520
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521 """Mix-in class to handle each request in a new process."""
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522
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523 timeout = 300
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524 active_children = None
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525 max_children = 40
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526
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527 def collect_children(self):
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diff changeset
528 """Internal routine to wait for children that have exited."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
529 if self.active_children is None: return
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
530 while len(self.active_children) >= self.max_children:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
531 # XXX: This will wait for any child process, not just ones
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
532 # spawned by this library. This could confuse other
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
533 # libraries that expect to be able to wait for their own
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
534 # children.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
535 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
536 pid, status = os.waitpid(0, 0)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
537 except os.error:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
538 pid = None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
539 if pid not in self.active_children: continue
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
540 self.active_children.remove(pid)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
541
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
542 # XXX: This loop runs more system calls than it ought
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
543 # to. There should be a way to put the active_children into a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
544 # process group and then use os.waitpid(-pgid) to wait for any
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
545 # of that set, but I couldn't find a way to allocate pgids
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
546 # that couldn't collide.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
547 for child in self.active_children:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
548 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
549 pid, status = os.waitpid(child, os.WNOHANG)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
550 except os.error:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
551 pid = None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
552 if not pid: continue
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
553 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
554 self.active_children.remove(pid)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
555 except ValueError as e:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
556 raise ValueError('%s. x=%d and list=%r' % (e.message, pid,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
557 self.active_children))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
558
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
559 def handle_timeout(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
560 """Wait for zombies after self.timeout seconds of inactivity.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
561
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
562 May be extended, do not override.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
563 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
564 self.collect_children()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
565
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
566 def service_actions(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
567 """Collect the zombie child processes regularly in the ForkingMixIn.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
568
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
569 service_actions is called in the BaseServer's serve_forver loop.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
570 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
571 self.collect_children()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
572
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
573 def process_request(self, request, client_address):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
574 """Fork a new subprocess to process the request."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
575 pid = os.fork()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
576 if pid:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
577 # Parent process
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
578 if self.active_children is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
579 self.active_children = []
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
580 self.active_children.append(pid)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
581 self.close_request(request)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
582 return
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
583 else:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
584 # Child process.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
585 # This must never return, hence os._exit()!
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
586 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
587 self.finish_request(request, client_address)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
588 self.shutdown_request(request)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
589 os._exit(0)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
590 except:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
591 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
592 self.handle_error(request, client_address)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
593 self.shutdown_request(request)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
594 finally:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
595 os._exit(1)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
596
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
597
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
598 class ThreadingMixIn(object):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
599 """Mix-in class to handle each request in a new thread."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
600
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
601 # Decides how threads will act upon termination of the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
602 # main process
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
603 daemon_threads = False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
604
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
605 def process_request_thread(self, request, client_address):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
606 """Same as in BaseServer but as a thread.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
607
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
608 In addition, exception handling is done here.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
609
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
610 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
611 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
612 self.finish_request(request, client_address)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
613 self.shutdown_request(request)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
614 except:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
615 self.handle_error(request, client_address)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
616 self.shutdown_request(request)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
617
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
618 def process_request(self, request, client_address):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
619 """Start a new thread to process the request."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
620 t = threading.Thread(target = self.process_request_thread,
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
621 args = (request, client_address))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
622 t.daemon = self.daemon_threads
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
623 t.start()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
624
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
625
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
626 class ForkingUDPServer(ForkingMixIn, UDPServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
627 class ForkingTCPServer(ForkingMixIn, TCPServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
628
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
629 class ThreadingUDPServer(ThreadingMixIn, UDPServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
630 class ThreadingTCPServer(ThreadingMixIn, TCPServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
631
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
632 if hasattr(socket, 'AF_UNIX'):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
633
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
634 class UnixStreamServer(TCPServer):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
635 address_family = socket.AF_UNIX
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
636
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
637 class UnixDatagramServer(UDPServer):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
638 address_family = socket.AF_UNIX
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
639
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
640 class ThreadingUnixStreamServer(ThreadingMixIn, UnixStreamServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
641
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
642 class ThreadingUnixDatagramServer(ThreadingMixIn, UnixDatagramServer): pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
643
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
644 class BaseRequestHandler(object):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
645
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
646 """Base class for request handler classes.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
647
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
648 This class is instantiated for each request to be handled. The
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
649 constructor sets the instance variables request, client_address
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
650 and server, and then calls the handle() method. To implement a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
651 specific service, all you need to do is to derive a class which
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
652 defines a handle() method.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
653
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
654 The handle() method can find the request as self.request, the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
655 client address as self.client_address, and the server (in case it
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
656 needs access to per-server information) as self.server. Since a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
657 separate instance is created for each request, the handle() method
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
658 can define arbitrary other instance variariables.
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659
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660 """
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661
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662 def __init__(self, request, client_address, server):
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663 self.request = request
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664 self.client_address = client_address
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665 self.server = server
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666 self.setup()
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667 try:
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668 self.handle()
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669 finally:
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670 self.finish()
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671
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672 def setup(self):
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673 pass
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674
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675 def handle(self):
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676 pass
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677
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678 def finish(self):
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679 pass
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680
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681
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682 # The following two classes make it possible to use the same service
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683 # class for stream or datagram servers.
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684 # Each class sets up these instance variables:
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685 # - rfile: a file object from which receives the request is read
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686 # - wfile: a file object to which the reply is written
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687 # When the handle() method returns, wfile is flushed properly
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688
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689
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690 class StreamRequestHandler(BaseRequestHandler):
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691
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692 """Define self.rfile and self.wfile for stream sockets."""
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693
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694 # Default buffer sizes for rfile, wfile.
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695 # We default rfile to buffered because otherwise it could be
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696 # really slow for large data (a getc() call per byte); we make
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697 # wfile unbuffered because (a) often after a write() we want to
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698 # read and we need to flush the line; (b) big writes to unbuffered
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699 # files are typically optimized by stdio even when big reads
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700 # aren't.
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701 rbufsize = -1
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702 wbufsize = 0
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703
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704 # A timeout to apply to the request socket, if not None.
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705 timeout = None
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706
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707 # Disable nagle algorithm for this socket, if True.
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708 # Use only when wbufsize != 0, to avoid small packets.
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709 disable_nagle_algorithm = False
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710
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711 def setup(self):
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712 self.connection = self.request
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713 if self.timeout is not None:
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714 self.connection.settimeout(self.timeout)
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715 if self.disable_nagle_algorithm:
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716 self.connection.setsockopt(socket.IPPROTO_TCP,
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717 socket.TCP_NODELAY, True)
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718 self.rfile = self.connection.makefile('rb', self.rbufsize)
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719 self.wfile = self.connection.makefile('wb', self.wbufsize)
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720
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721 def finish(self):
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722 if not self.wfile.closed:
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723 try:
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724 self.wfile.flush()
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725 except socket.error:
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726 # An final socket error may have occurred here, such as
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727 # the local error ECONNABORTED.
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728 pass
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729 self.wfile.close()
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730 self.rfile.close()
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731
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732
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733 class DatagramRequestHandler(BaseRequestHandler):
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734
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735 # XXX Regrettably, I cannot get this working on Linux;
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736 # s.recvfrom() doesn't return a meaningful client address.
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737
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738 """Define self.rfile and self.wfile for datagram sockets."""
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739
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740 def setup(self):
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741 from io import BytesIO
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742 self.packet, self.socket = self.request
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743 self.rfile = BytesIO(self.packet)
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744 self.wfile = BytesIO()
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745
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746 def finish(self):
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747 self.socket.sendto(self.wfile.getvalue(), self.client_address)