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annotate env/lib/python3.9/site-packages/urllib3/util/timeout.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2
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3 import time
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4
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5 # The default socket timeout, used by httplib to indicate that no timeout was
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6 # specified by the user
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7 from socket import _GLOBAL_DEFAULT_TIMEOUT
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8
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9 from ..exceptions import TimeoutStateError
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10
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11 # A sentinel value to indicate that no timeout was specified by the user in
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12 # urllib3
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13 _Default = object()
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14
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15
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16 # Use time.monotonic if available.
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17 current_time = getattr(time, "monotonic", time.time)
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18
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19
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20 class Timeout(object):
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21 """Timeout configuration.
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22
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23 Timeouts can be defined as a default for a pool:
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24
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25 .. code-block:: python
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26
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27 timeout = Timeout(connect=2.0, read=7.0)
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28 http = PoolManager(timeout=timeout)
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29 response = http.request('GET', 'http://example.com/')
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30
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31 Or per-request (which overrides the default for the pool):
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32
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33 .. code-block:: python
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34
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35 response = http.request('GET', 'http://example.com/', timeout=Timeout(10))
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36
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37 Timeouts can be disabled by setting all the parameters to ``None``:
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38
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39 .. code-block:: python
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40
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41 no_timeout = Timeout(connect=None, read=None)
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42 response = http.request('GET', 'http://example.com/, timeout=no_timeout)
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43
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44
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45 :param total:
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46 This combines the connect and read timeouts into one; the read timeout
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47 will be set to the time leftover from the connect attempt. In the
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48 event that both a connect timeout and a total are specified, or a read
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49 timeout and a total are specified, the shorter timeout will be applied.
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50
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51 Defaults to None.
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52
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53 :type total: int, float, or None
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54
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55 :param connect:
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56 The maximum amount of time (in seconds) to wait for a connection
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57 attempt to a server to succeed. Omitting the parameter will default the
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58 connect timeout to the system default, probably `the global default
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59 timeout in socket.py
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60 <http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
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61 None will set an infinite timeout for connection attempts.
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62
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63 :type connect: int, float, or None
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64
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65 :param read:
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66 The maximum amount of time (in seconds) to wait between consecutive
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67 read operations for a response from the server. Omitting the parameter
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68 will default the read timeout to the system default, probably `the
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69 global default timeout in socket.py
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70 <http://hg.python.org/cpython/file/603b4d593758/Lib/socket.py#l535>`_.
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71 None will set an infinite timeout.
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72
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73 :type read: int, float, or None
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74
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75 .. note::
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76
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77 Many factors can affect the total amount of time for urllib3 to return
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78 an HTTP response.
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79
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80 For example, Python's DNS resolver does not obey the timeout specified
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81 on the socket. Other factors that can affect total request time include
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82 high CPU load, high swap, the program running at a low priority level,
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83 or other behaviors.
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84
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85 In addition, the read and total timeouts only measure the time between
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86 read operations on the socket connecting the client and the server,
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87 not the total amount of time for the request to return a complete
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88 response. For most requests, the timeout is raised because the server
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89 has not sent the first byte in the specified time. This is not always
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90 the case; if a server streams one byte every fifteen seconds, a timeout
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91 of 20 seconds will not trigger, even though the request will take
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92 several minutes to complete.
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93
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94 If your goal is to cut off any request after a set amount of wall clock
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95 time, consider having a second "watcher" thread to cut off a slow
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96 request.
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97 """
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98
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99 #: A sentinel object representing the default timeout value
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100 DEFAULT_TIMEOUT = _GLOBAL_DEFAULT_TIMEOUT
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101
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102 def __init__(self, total=None, connect=_Default, read=_Default):
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103 self._connect = self._validate_timeout(connect, "connect")
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104 self._read = self._validate_timeout(read, "read")
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105 self.total = self._validate_timeout(total, "total")
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106 self._start_connect = None
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107
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108 def __repr__(self):
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109 return "%s(connect=%r, read=%r, total=%r)" % (
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110 type(self).__name__,
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111 self._connect,
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112 self._read,
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113 self.total,
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114 )
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115
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116 # __str__ provided for backwards compatibility
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117 __str__ = __repr__
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118
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119 @classmethod
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120 def _validate_timeout(cls, value, name):
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121 """Check that a timeout attribute is valid.
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122
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123 :param value: The timeout value to validate
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124 :param name: The name of the timeout attribute to validate. This is
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125 used to specify in error messages.
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126 :return: The validated and casted version of the given value.
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127 :raises ValueError: If it is a numeric value less than or equal to
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128 zero, or the type is not an integer, float, or None.
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129 """
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130 if value is _Default:
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131 return cls.DEFAULT_TIMEOUT
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132
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133 if value is None or value is cls.DEFAULT_TIMEOUT:
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134 return value
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135
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136 if isinstance(value, bool):
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137 raise ValueError(
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138 "Timeout cannot be a boolean value. It must "
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139 "be an int, float or None."
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140 )
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141 try:
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142 float(value)
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143 except (TypeError, ValueError):
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144 raise ValueError(
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145 "Timeout value %s was %s, but it must be an "
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146 "int, float or None." % (name, value)
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147 )
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148
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149 try:
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150 if value <= 0:
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151 raise ValueError(
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152 "Attempted to set %s timeout to %s, but the "
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153 "timeout cannot be set to a value less "
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154 "than or equal to 0." % (name, value)
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155 )
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156 except TypeError:
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157 # Python 3
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158 raise ValueError(
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159 "Timeout value %s was %s, but it must be an "
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160 "int, float or None." % (name, value)
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161 )
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162
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163 return value
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164
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165 @classmethod
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166 def from_float(cls, timeout):
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167 """Create a new Timeout from a legacy timeout value.
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168
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169 The timeout value used by httplib.py sets the same timeout on the
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170 connect(), and recv() socket requests. This creates a :class:`Timeout`
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171 object that sets the individual timeouts to the ``timeout`` value
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172 passed to this function.
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173
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174 :param timeout: The legacy timeout value.
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175 :type timeout: integer, float, sentinel default object, or None
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176 :return: Timeout object
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177 :rtype: :class:`Timeout`
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178 """
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179 return Timeout(read=timeout, connect=timeout)
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180
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181 def clone(self):
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182 """Create a copy of the timeout object
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183
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184 Timeout properties are stored per-pool but each request needs a fresh
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185 Timeout object to ensure each one has its own start/stop configured.
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186
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187 :return: a copy of the timeout object
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188 :rtype: :class:`Timeout`
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189 """
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190 # We can't use copy.deepcopy because that will also create a new object
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191 # for _GLOBAL_DEFAULT_TIMEOUT, which socket.py uses as a sentinel to
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192 # detect the user default.
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193 return Timeout(connect=self._connect, read=self._read, total=self.total)
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194
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195 def start_connect(self):
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196 """Start the timeout clock, used during a connect() attempt
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197
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198 :raises urllib3.exceptions.TimeoutStateError: if you attempt
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199 to start a timer that has been started already.
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200 """
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201 if self._start_connect is not None:
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202 raise TimeoutStateError("Timeout timer has already been started.")
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203 self._start_connect = current_time()
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204 return self._start_connect
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205
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206 def get_connect_duration(self):
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207 """Gets the time elapsed since the call to :meth:`start_connect`.
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208
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209 :return: Elapsed time in seconds.
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210 :rtype: float
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211 :raises urllib3.exceptions.TimeoutStateError: if you attempt
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212 to get duration for a timer that hasn't been started.
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213 """
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214 if self._start_connect is None:
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215 raise TimeoutStateError(
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216 "Can't get connect duration for timer that has not started."
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217 )
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218 return current_time() - self._start_connect
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219
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220 @property
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221 def connect_timeout(self):
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222 """Get the value to use when setting a connection timeout.
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223
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224 This will be a positive float or integer, the value None
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225 (never timeout), or the default system timeout.
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226
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227 :return: Connect timeout.
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228 :rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
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229 """
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230 if self.total is None:
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231 return self._connect
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232
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233 if self._connect is None or self._connect is self.DEFAULT_TIMEOUT:
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234 return self.total
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235
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236 return min(self._connect, self.total)
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237
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238 @property
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239 def read_timeout(self):
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240 """Get the value for the read timeout.
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241
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242 This assumes some time has elapsed in the connection timeout and
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243 computes the read timeout appropriately.
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244
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245 If self.total is set, the read timeout is dependent on the amount of
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246 time taken by the connect timeout. If the connection time has not been
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247 established, a :exc:`~urllib3.exceptions.TimeoutStateError` will be
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248 raised.
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249
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250 :return: Value to use for the read timeout.
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251 :rtype: int, float, :attr:`Timeout.DEFAULT_TIMEOUT` or None
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252 :raises urllib3.exceptions.TimeoutStateError: If :meth:`start_connect`
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253 has not yet been called on this object.
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254 """
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255 if (
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256 self.total is not None
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257 and self.total is not self.DEFAULT_TIMEOUT
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258 and self._read is not None
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259 and self._read is not self.DEFAULT_TIMEOUT
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260 ):
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261 # In case the connect timeout has not yet been established.
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262 if self._start_connect is None:
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263 return self._read
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264 return max(0, min(self.total - self.get_connect_duration(), self._read))
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265 elif self.total is not None and self.total is not self.DEFAULT_TIMEOUT:
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266 return max(0, self.total - self.get_connect_duration())
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267 else:
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268 return self._read