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annotate venv/lib/python2.7/site-packages/requests_toolbelt/threaded/pool.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -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 try:
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4 import queue # Python 3
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5 except ImportError:
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6 import Queue as queue
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7
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8 import requests
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9
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10 from . import thread
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11
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12
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13 class Pool(object):
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14 """Pool that manages the threads containing sessions.
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15
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16 :param queue:
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17 The queue you're expected to use to which you should add items.
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18 :type queue: queue.Queue
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19 :param initializer:
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20 Function used to initialize an instance of ``session``.
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21 :type initializer: collections.Callable
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22 :param auth_generator:
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23 Function used to generate new auth credentials for the session.
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24 :type auth_generator: collections.Callable
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25 :param int num_threads:
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26 Number of threads to create.
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27 :param session:
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28 :type session: requests.Session
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29 """
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30
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31 def __init__(self, job_queue, initializer=None, auth_generator=None,
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32 num_processes=None, session=requests.Session):
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33 if num_processes is None:
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34 num_processes = multiprocessing.cpu_count() or 1
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35
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36 if num_processes < 1:
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37 raise ValueError("Number of processes should at least be 1.")
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38
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39 self._job_queue = job_queue
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40 self._response_queue = queue.Queue()
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41 self._exc_queue = queue.Queue()
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42 self._processes = num_processes
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43 self._initializer = initializer or _identity
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44 self._auth = auth_generator or _identity
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45 self._session = session
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46 self._pool = [
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47 thread.SessionThread(self._new_session(), self._job_queue,
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48 self._response_queue, self._exc_queue)
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49 for _ in range(self._processes)
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50 ]
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51
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52 def _new_session(self):
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53 return self._auth(self._initializer(self._session()))
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54
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55 @classmethod
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56 def from_exceptions(cls, exceptions, **kwargs):
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57 r"""Create a :class:`~Pool` from an :class:`~ThreadException`\ s.
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58
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59 Provided an iterable that provides :class:`~ThreadException` objects,
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60 this classmethod will generate a new pool to retry the requests that
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61 caused the exceptions.
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62
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63 :param exceptions:
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64 Iterable that returns :class:`~ThreadException`
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65 :type exceptions: iterable
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66 :param kwargs:
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67 Keyword arguments passed to the :class:`~Pool` initializer.
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68 :returns: An initialized :class:`~Pool` object.
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69 :rtype: :class:`~Pool`
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70 """
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71 job_queue = queue.Queue()
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72 for exc in exceptions:
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73 job_queue.put(exc.request_kwargs)
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74
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75 return cls(job_queue=job_queue, **kwargs)
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76
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77 @classmethod
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78 def from_urls(cls, urls, request_kwargs=None, **kwargs):
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79 """Create a :class:`~Pool` from an iterable of URLs.
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80
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81 :param urls:
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82 Iterable that returns URLs with which we create a pool.
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83 :type urls: iterable
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84 :param dict request_kwargs:
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85 Dictionary of other keyword arguments to provide to the request
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86 method.
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87 :param kwargs:
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88 Keyword arguments passed to the :class:`~Pool` initializer.
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89 :returns: An initialized :class:`~Pool` object.
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90 :rtype: :class:`~Pool`
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91 """
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92 request_dict = {'method': 'GET'}
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93 request_dict.update(request_kwargs or {})
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94 job_queue = queue.Queue()
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95 for url in urls:
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96 job = request_dict.copy()
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97 job.update({'url': url})
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98 job_queue.put(job)
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99
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100 return cls(job_queue=job_queue, **kwargs)
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101
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102 def exceptions(self):
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103 """Iterate over all the exceptions in the pool.
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104
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105 :returns: Generator of :class:`~ThreadException`
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106 """
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107 while True:
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108 exc = self.get_exception()
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109 if exc is None:
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110 break
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111 yield exc
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112
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113 def get_exception(self):
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114 """Get an exception from the pool.
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115
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116 :rtype: :class:`~ThreadException`
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117 """
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118 try:
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119 (request, exc) = self._exc_queue.get_nowait()
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120 except queue.Empty:
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121 return None
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122 else:
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123 return ThreadException(request, exc)
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124
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125 def get_response(self):
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126 """Get a response from the pool.
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127
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128 :rtype: :class:`~ThreadResponse`
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129 """
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130 try:
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131 (request, response) = self._response_queue.get_nowait()
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132 except queue.Empty:
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133 return None
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134 else:
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135 return ThreadResponse(request, response)
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136
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137 def responses(self):
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138 """Iterate over all the responses in the pool.
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139
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140 :returns: Generator of :class:`~ThreadResponse`
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141 """
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142 while True:
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143 resp = self.get_response()
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144 if resp is None:
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145 break
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146 yield resp
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147
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148 def join_all(self):
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149 """Join all the threads to the master thread."""
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150 for session_thread in self._pool:
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151 session_thread.join()
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152
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153
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154 class ThreadProxy(object):
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155 proxied_attr = None
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156
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157 def __getattr__(self, attr):
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158 """Proxy attribute accesses to the proxied object."""
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159 get = object.__getattribute__
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160 if attr not in self.attrs:
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161 response = get(self, self.proxied_attr)
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162 return getattr(response, attr)
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163 else:
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164 return get(self, attr)
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165
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166
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167 class ThreadResponse(ThreadProxy):
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168 """A wrapper around a requests Response object.
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169
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170 This will proxy most attribute access actions to the Response object. For
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171 example, if you wanted the parsed JSON from the response, you might do:
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172
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173 .. code-block:: python
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174
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175 thread_response = pool.get_response()
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176 json = thread_response.json()
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177
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178 """
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179 proxied_attr = 'response'
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180 attrs = frozenset(['request_kwargs', 'response'])
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181
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182 def __init__(self, request_kwargs, response):
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183 #: The original keyword arguments provided to the queue
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184 self.request_kwargs = request_kwargs
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185 #: The wrapped response
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186 self.response = response
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187
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188
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189 class ThreadException(ThreadProxy):
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190 """A wrapper around an exception raised during a request.
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191
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192 This will proxy most attribute access actions to the exception object. For
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193 example, if you wanted the message from the exception, you might do:
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194
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195 .. code-block:: python
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196
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197 thread_exc = pool.get_exception()
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198 msg = thread_exc.message
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199
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200 """
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201 proxied_attr = 'exception'
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202 attrs = frozenset(['request_kwargs', 'exception'])
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203
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204 def __init__(self, request_kwargs, exception):
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205 #: The original keyword arguments provided to the queue
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206 self.request_kwargs = request_kwargs
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207 #: The captured and wrapped exception
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208 self.exception = exception
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209
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210
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211 def _identity(session_obj):
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212 return session_obj
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213
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214
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215 __all__ = ['ThreadException', 'ThreadResponse', 'Pool']