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annotate planemo/lib/python3.7/site-packages/urllib3/util/timeout.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 from __future__ import absolute_import
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2
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3 # The default socket timeout, used by httplib to indicate that no timeout was
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4 # specified by the user
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5 from socket import _GLOBAL_DEFAULT_TIMEOUT
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6 import time
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7
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8 from ..exceptions import TimeoutStateError
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9
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10 # A sentinel value to indicate that no timeout was specified by the user in
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11 # urllib3
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12 _Default = object()
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13
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14
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15 # Use time.monotonic if available.
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16 current_time = getattr(time, "monotonic", time.time)
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17
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18
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19 class Timeout(object):
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20 """ Timeout configuration.
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21
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22 Timeouts can be defined as a default for a pool::
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23
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24 timeout = Timeout(connect=2.0, read=7.0)
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25 http = PoolManager(timeout=timeout)
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26 response = http.request('GET', 'http://example.com/')
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27
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28 Or per-request (which overrides the default for the pool)::
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29
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30 response = http.request('GET', 'http://example.com/', timeout=Timeout(10))
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31
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32 Timeouts can be disabled by setting all the parameters to ``None``::
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33
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34 no_timeout = Timeout(connect=None, read=None)
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35 response = http.request('GET', 'http://example.com/, timeout=no_timeout)
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36
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37
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38 :param total:
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39 This combines the connect and read timeouts into one; the read timeout
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40 will be set to the time leftover from the connect attempt. In the
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41 event that both a connect timeout and a total are specified, or a read
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42 timeout and a total are specified, the shorter timeout will be applied.
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43
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44 Defaults to None.
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45
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46 :type total: integer, float, or None
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47
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48 :param connect:
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49 The maximum amount of time (in seconds) to wait for a connection
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50 attempt to a server to succeed. Omitting the parameter will default the
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51 connect timeout to the system default, probably `the global default
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52 timeout in socket.py
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53 <http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
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54 None will set an infinite timeout for connection attempts.
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55
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56 :type connect: integer, float, or None
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57
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58 :param read:
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59 The maximum amount of time (in seconds) to wait between consecutive
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60 read operations for a response from the server. Omitting the parameter
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61 will default the read timeout to the system default, probably `the
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62 global default timeout in socket.py
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63 <http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
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64 None will set an infinite timeout.
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65
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66 :type read: integer, float, or None
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67
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68 .. note::
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69
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70 Many factors can affect the total amount of time for urllib3 to return
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71 an HTTP response.
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72
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73 For example, Python's DNS resolver does not obey the timeout specified
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74 on the socket. Other factors that can affect total request time include
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75 high CPU load, high swap, the program running at a low priority level,
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76 or other behaviors.
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77
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78 In addition, the read and total timeouts only measure the time between
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79 read operations on the socket connecting the client and the server,
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80 not the total amount of time for the request to return a complete
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81 response. For most requests, the timeout is raised because the server
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82 has not sent the first byte in the specified time. This is not always
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83 the case; if a server streams one byte every fifteen seconds, a timeout
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84 of 20 seconds will not trigger, even though the request will take
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85 several minutes to complete.
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86
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87 If your goal is to cut off any request after a set amount of wall clock
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88 time, consider having a second "watcher" thread to cut off a slow
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89 request.
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90 """
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91
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92 #: A sentinel object representing the default timeout value
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93 DEFAULT_TIMEOUT = _GLOBAL_DEFAULT_TIMEOUT
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94
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95 def __init__(self, total=None, connect=_Default, read=_Default):
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96 self._connect = self._validate_timeout(connect, "connect")
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97 self._read = self._validate_timeout(read, "read")
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98 self.total = self._validate_timeout(total, "total")
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99 self._start_connect = None
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100
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101 def __repr__(self):
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102 return "%s(connect=%r, read=%r, total=%r)" % (
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103 type(self).__name__,
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104 self._connect,
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105 self._read,
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106 self.total,
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107 )
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108
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109 # __str__ provided for backwards compatibility
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110 __str__ = __repr__
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111
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112 @classmethod
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113 def _validate_timeout(cls, value, name):
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114 """ Check that a timeout attribute is valid.
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115
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116 :param value: The timeout value to validate
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117 :param name: The name of the timeout attribute to validate. This is
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118 used to specify in error messages.
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119 :return: The validated and casted version of the given value.
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120 :raises ValueError: If it is a numeric value less than or equal to
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121 zero, or the type is not an integer, float, or None.
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122 """
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123 if value is _Default:
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124 return cls.DEFAULT_TIMEOUT
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125
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126 if value is None or value is cls.DEFAULT_TIMEOUT:
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127 return value
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128
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129 if isinstance(value, bool):
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130 raise ValueError(
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131 "Timeout cannot be a boolean value. It must "
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132 "be an int, float or None."
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133 )
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134 try:
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135 float(value)
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136 except (TypeError, ValueError):
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137 raise ValueError(
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138 "Timeout value %s was %s, but it must be an "
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139 "int, float or None." % (name, value)
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140 )
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141
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142 try:
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143 if value <= 0:
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144 raise ValueError(
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145 "Attempted to set %s timeout to %s, but the "
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146 "timeout cannot be set to a value less "
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147 "than or equal to 0." % (name, value)
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148 )
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149 except TypeError:
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150 # Python 3
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151 raise ValueError(
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152 "Timeout value %s was %s, but it must be an "
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153 "int, float or None." % (name, value)
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154 )
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155
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156 return value
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157
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158 @classmethod
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159 def from_float(cls, timeout):
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160 """ Create a new Timeout from a legacy timeout value.
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161
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162 The timeout value used by httplib.py sets the same timeout on the
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163 connect(), and recv() socket requests. This creates a :class:`Timeout`
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164 object that sets the individual timeouts to the ``timeout`` value
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165 passed to this function.
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166
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167 :param timeout: The legacy timeout value.
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168 :type timeout: integer, float, sentinel default object, or None
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169 :return: Timeout object
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170 :rtype: :class:`Timeout`
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171 """
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172 return Timeout(read=timeout, connect=timeout)
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173
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174 def clone(self):
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175 """ Create a copy of the timeout object
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176
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177 Timeout properties are stored per-pool but each request needs a fresh
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178 Timeout object to ensure each one has its own start/stop configured.
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179
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180 :return: a copy of the timeout object
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181 :rtype: :class:`Timeout`
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182 """
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183 # We can't use copy.deepcopy because that will also create a new object
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184 # for _GLOBAL_DEFAULT_TIMEOUT, which socket.py uses as a sentinel to
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185 # detect the user default.
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186 return Timeout(connect=self._connect, read=self._read, total=self.total)
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187
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188 def start_connect(self):
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189 """ Start the timeout clock, used during a connect() attempt
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190
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191 :raises urllib3.exceptions.TimeoutStateError: if you attempt
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192 to start a timer that has been started already.
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193 """
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194 if self._start_connect is not None:
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195 raise TimeoutStateError("Timeout timer has already been started.")
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196 self._start_connect = current_time()
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197 return self._start_connect
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198
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199 def get_connect_duration(self):
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200 """ Gets the time elapsed since the call to :meth:`start_connect`.
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201
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202 :return: Elapsed time in seconds.
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203 :rtype: float
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204 :raises urllib3.exceptions.TimeoutStateError: if you attempt
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205 to get duration for a timer that hasn't been started.
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206 """
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207 if self._start_connect is None:
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208 raise TimeoutStateError(
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209 "Can't get connect duration for timer that has not started."
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210 )
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211 return current_time() - self._start_connect
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212
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213 @property
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214 def connect_timeout(self):
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215 """ Get the value to use when setting a connection timeout.
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216
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217 This will be a positive float or integer, the value None
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218 (never timeout), or the default system timeout.
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219
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220 :return: Connect timeout.
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221 :rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
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222 """
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223 if self.total is None:
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224 return self._connect
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225
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226 if self._connect is None or self._connect is self.DEFAULT_TIMEOUT:
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227 return self.total
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228
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229 return min(self._connect, self.total)
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230
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231 @property
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232 def read_timeout(self):
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233 """ Get the value for the read timeout.
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234
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235 This assumes some time has elapsed in the connection timeout and
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236 computes the read timeout appropriately.
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237
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238 If self.total is set, the read timeout is dependent on the amount of
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239 time taken by the connect timeout. If the connection time has not been
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240 established, a :exc:`~urllib3.exceptions.TimeoutStateError` will be
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241 raised.
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242
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243 :return: Value to use for the read timeout.
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244 :rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
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245 :raises urllib3.exceptions.TimeoutStateError: If :meth:`start_connect`
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246 has not yet been called on this object.
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247 """
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248 if (
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249 self.total is not None
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250 and self.total is not self.DEFAULT_TIMEOUT
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251 and self._read is not None
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252 and self._read is not self.DEFAULT_TIMEOUT
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253 ):
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254 # In case the connect timeout has not yet been established.
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255 if self._start_connect is None:
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256 return self._read
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257 return max(0, min(self.total - self.get_connect_duration(), self._read))
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258 elif self.total is not None and self.total is not self.DEFAULT_TIMEOUT:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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259 return max(0, self.total - self.get_connect_duration())
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
260 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
261 return self._read