Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/requests_toolbelt/threaded/pool.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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1 """Module implementing the Pool for :mod:``requests_toolbelt.threaded``."""
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2 import multiprocessing
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3 import requests
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4
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5 from . import thread
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6 from .._compat import queue
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7
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8
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9 class Pool(object):
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10 """Pool that manages the threads containing sessions.
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11
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12 :param queue:
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13 The queue you're expected to use to which you should add items.
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14 :type queue: queue.Queue
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15 :param initializer:
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16 Function used to initialize an instance of ``session``.
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17 :type initializer: collections.Callable
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18 :param auth_generator:
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19 Function used to generate new auth credentials for the session.
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20 :type auth_generator: collections.Callable
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21 :param int num_process:
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22 Number of threads to create.
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23 :param session:
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24 :type session: requests.Session
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25 """
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26
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27 def __init__(self, job_queue, initializer=None, auth_generator=None,
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28 num_processes=None, session=requests.Session):
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29 if num_processes is None:
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30 num_processes = multiprocessing.cpu_count() or 1
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31
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32 if num_processes < 1:
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33 raise ValueError("Number of processes should at least be 1.")
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34
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35 self._job_queue = job_queue
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36 self._response_queue = queue.Queue()
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37 self._exc_queue = queue.Queue()
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38 self._processes = num_processes
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39 self._initializer = initializer or _identity
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40 self._auth = auth_generator or _identity
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41 self._session = session
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42 self._pool = [
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43 thread.SessionThread(self._new_session(), self._job_queue,
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44 self._response_queue, self._exc_queue)
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45 for _ in range(self._processes)
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46 ]
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47
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48 def _new_session(self):
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49 return self._auth(self._initializer(self._session()))
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50
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51 @classmethod
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52 def from_exceptions(cls, exceptions, **kwargs):
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53 r"""Create a :class:`~Pool` from an :class:`~ThreadException`\ s.
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54
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55 Provided an iterable that provides :class:`~ThreadException` objects,
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56 this classmethod will generate a new pool to retry the requests that
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57 caused the exceptions.
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58
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59 :param exceptions:
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60 Iterable that returns :class:`~ThreadException`
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61 :type exceptions: iterable
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62 :param kwargs:
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63 Keyword arguments passed to the :class:`~Pool` initializer.
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64 :returns: An initialized :class:`~Pool` object.
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65 :rtype: :class:`~Pool`
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66 """
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67 job_queue = queue.Queue()
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68 for exc in exceptions:
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69 job_queue.put(exc.request_kwargs)
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70
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71 return cls(job_queue=job_queue, **kwargs)
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72
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73 @classmethod
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74 def from_urls(cls, urls, request_kwargs=None, **kwargs):
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75 """Create a :class:`~Pool` from an iterable of URLs.
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76
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77 :param urls:
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78 Iterable that returns URLs with which we create a pool.
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79 :type urls: iterable
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80 :param dict request_kwargs:
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81 Dictionary of other keyword arguments to provide to the request
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82 method.
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83 :param kwargs:
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84 Keyword arguments passed to the :class:`~Pool` initializer.
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85 :returns: An initialized :class:`~Pool` object.
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86 :rtype: :class:`~Pool`
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87 """
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88 request_dict = {'method': 'GET'}
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89 request_dict.update(request_kwargs or {})
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90 job_queue = queue.Queue()
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91 for url in urls:
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92 job = request_dict.copy()
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93 job.update({'url': url})
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94 job_queue.put(job)
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95
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96 return cls(job_queue=job_queue, **kwargs)
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97
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98 def exceptions(self):
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99 """Iterate over all the exceptions in the pool.
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100
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101 :returns: Generator of :class:`~ThreadException`
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102 """
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103 while True:
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104 exc = self.get_exception()
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105 if exc is None:
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106 break
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107 yield exc
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108
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109 def get_exception(self):
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110 """Get an exception from the pool.
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111
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112 :rtype: :class:`~ThreadException`
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113 """
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114 try:
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115 (request, exc) = self._exc_queue.get_nowait()
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116 except queue.Empty:
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117 return None
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118 else:
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119 return ThreadException(request, exc)
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120
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121 def get_response(self):
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122 """Get a response from the pool.
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123
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124 :rtype: :class:`~ThreadResponse`
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125 """
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126 try:
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127 (request, response) = self._response_queue.get_nowait()
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128 except queue.Empty:
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129 return None
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130 else:
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131 return ThreadResponse(request, response)
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132
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133 def responses(self):
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134 """Iterate over all the responses in the pool.
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135
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136 :returns: Generator of :class:`~ThreadResponse`
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137 """
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138 while True:
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139 resp = self.get_response()
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140 if resp is None:
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141 break
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142 yield resp
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143
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144 def join_all(self):
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145 """Join all the threads to the master thread."""
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146 for session_thread in self._pool:
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147 session_thread.join()
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148
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149
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150 class ThreadProxy(object):
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151 proxied_attr = None
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152
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153 def __getattr__(self, attr):
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154 """Proxy attribute accesses to the proxied object."""
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155 get = object.__getattribute__
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156 if attr not in self.attrs:
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157 response = get(self, self.proxied_attr)
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158 return getattr(response, attr)
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159 else:
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160 return get(self, attr)
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161
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162
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163 class ThreadResponse(ThreadProxy):
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164 """A wrapper around a requests Response object.
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165
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166 This will proxy most attribute access actions to the Response object. For
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167 example, if you wanted the parsed JSON from the response, you might do:
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168
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169 .. code-block:: python
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170
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171 thread_response = pool.get_response()
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172 json = thread_response.json()
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173
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174 """
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175 proxied_attr = 'response'
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176 attrs = frozenset(['request_kwargs', 'response'])
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177
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178 def __init__(self, request_kwargs, response):
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179 #: The original keyword arguments provided to the queue
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180 self.request_kwargs = request_kwargs
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181 #: The wrapped response
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182 self.response = response
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183
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184
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185 class ThreadException(ThreadProxy):
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186 """A wrapper around an exception raised during a request.
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187
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188 This will proxy most attribute access actions to the exception object. For
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189 example, if you wanted the message from the exception, you might do:
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190
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191 .. code-block:: python
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192
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193 thread_exc = pool.get_exception()
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194 msg = thread_exc.message
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195
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196 """
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197 proxied_attr = 'exception'
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198 attrs = frozenset(['request_kwargs', 'exception'])
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199
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200 def __init__(self, request_kwargs, exception):
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201 #: The original keyword arguments provided to the queue
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202 self.request_kwargs = request_kwargs
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203 #: The captured and wrapped exception
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204 self.exception = exception
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205
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206
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207 def _identity(session_obj):
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208 return session_obj
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209
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210
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211 __all__ = ['ThreadException', 'ThreadResponse', 'Pool']