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  52.   <div class="section" id="module-celery.backends.base">
    53. 

  53. <h1>Backend: Base - celery.backends.base<a class="headerlink" href="#module-celery.backends.base" title="Permalink to this headline">¶</a></h1>
    54. 

  54. <p>celery.backends.base</p>
    55. 

  55. <dl class="class">
    56. 

  56. <dt id="celery.backends.base.BaseBackend">
    57. 

  57. <em class="property">
    58. 

  58. class </em><tt class="descclassname">celery.backends.base.</tt><tt class="descname">BaseBackend</tt><a class="headerlink" href="#celery.backends.base.BaseBackend" title="Permalink to this definition">¶</a></dt>
    59. 

  59. <dd><p>The base backend class. All backends should inherit from this.</p>
    60. 

  60. <dl class="exception">
    61. 

  61. <dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper">
    62. 

  62. <em class="property">
    63. 

  63. exception </em><tt class="descname">UnpickleableExceptionWrapper</tt><big>(</big><em>exc_module</em>, <em>exc_cls_name</em>, <em>exc_args</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper" title="Permalink to this definition">¶</a></dt>
    64. 

  64. <dd><p>Wraps unpickleable exceptions.</p>
    65. 

  65. <table class="docutils field-list" frame="void" rules="none">
    66. 

  66. <col class="field-name" />
    67. 

  67. <col class="field-body" />
    68. 

  68. <tbody valign="top">
    69. 

  69. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    70. 

  70. <li><em>exc_module</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module"><tt class="xref docutils literal"><span class="pre">exc_module</span></tt></a>.</li>
    71. 

  71. <li><em>exc_cls_name</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name"><tt class="xref docutils literal"><span class="pre">exc_cls_name</span></tt></a>.</li>
    72. 

  72. <li><em>exc_args</em> &#8211; see <a title="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args" class="reference internal" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args"><tt class="xref docutils literal"><span class="pre">exc_args</span></tt></a></li>
    73. 

  73. </ul>
    74. 

  74. </td>
    75. 

  75. </tr>
    76. 

  76. </tbody>
    77. 

  77. </table>
    78. 

  78. <dl class="attribute">
    79. 

  79. <dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module">
    80. 

  80. <tt class="descname">exc_module</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_module" title="Permalink to this definition">¶</a></dt>
    81. 

  81. <dd>The module of the original exception.</dd></dl>
    82. 

  82. 

  83. <dl class="attribute">
    84. 

  84. <dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name">
    85. 

  85. <tt class="descname">exc_cls_name</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_cls_name" title="Permalink to this definition">¶</a></dt>
    86. 

  86. <dd>The name of the original exception class.</dd></dl>
    87. 

  87. 

  88. <dl class="attribute">
    89. 

  89. <dt id="celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args">
    90. 

  90. <tt class="descname">exc_args</tt><a class="headerlink" href="#celery.backends.base.BaseBackend.UnpickleableExceptionWrapper.exc_args" title="Permalink to this definition">¶</a></dt>
    91. 

  91. <dd>The arguments for the original exception.</dd></dl>
    92. 

  92. 

  93. <p>Example</p>
    94. 

  94. <div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">try</span><span class="p">:</span>
    95. 

  95. <span class="gp">... </span>    <span class="n">something_raising_unpickleable_exc</span><span class="p">()</span>
    96. 

  96. <span class="gp">&gt;&gt;&gt; </span><span class="k">except</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
    97. 

  97. <span class="gp">... </span>    <span class="n">exc</span> <span class="o">=</span> <span class="n">UnpickleableException</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__module__</span><span class="p">,</span>
    98. 

  98. <span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span>
    99. 

  99. <span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
    100. 

  100. <span class="gp">... </span>    <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span> <span class="c"># Works fine.</span>
    101. 

  101. </pre></div>
    102. 

  102. </div>
    103. 

  103. </dd></dl>
    104. 

  104. 

  105. <dl class="method">
    106. 

  106. <dt id="celery.backends.base.BaseBackend.cleanup">
    107. 

  107. <tt class="descclassname">BaseBackend.</tt><tt class="descname">cleanup</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.cleanup" title="Permalink to this definition">¶</a></dt>
    108. 

  108. <dd>Backend cleanup. Is run by
    109. 

  109. <a title="celery.task.DeleteExpiredTaskMetaTask" class="reference external" href="celery.task.html#celery.task.DeleteExpiredTaskMetaTask"><tt class="xref docutils literal"><span class="pre">celery.task.DeleteExpiredTaskMetaTask</span></tt></a>.</dd></dl>
    110. 

  110. 

  111. <dl class="method">
    112. 

  112. <dt id="celery.backends.base.BaseBackend.create_exception_cls">
    113. 

  113. <tt class="descclassname">BaseBackend.</tt><tt class="descname">create_exception_cls</tt><big>(</big><em>name</em>, <em>module</em>, <em>parent=None</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.create_exception_cls" title="Permalink to this definition">¶</a></dt>
    114. 

  114. <dd>Dynamically create an exception class.</dd></dl>
    115. 

  115. 

  116. <dl class="method">
    117. 

  117. <dt id="celery.backends.base.BaseBackend.exception_to_python">
    118. 

  118. <tt class="descclassname">BaseBackend.</tt><tt class="descname">exception_to_python</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.exception_to_python" title="Permalink to this definition">¶</a></dt>
    119. 

  119. <dd>Convert serialized exception to Python exception.</dd></dl>
    120. 

  120. 

  121. <dl class="method">
    122. 

  122. <dt id="celery.backends.base.BaseBackend.get_result">
    123. 

  123. <tt class="descclassname">BaseBackend.</tt><tt class="descname">get_result</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.get_result" title="Permalink to this definition">¶</a></dt>
    124. 

  124. <dd>Get the result of a task.</dd></dl>
    125. 

  125. 

  126. <dl class="method">
    127. 

  127. <dt id="celery.backends.base.BaseBackend.get_status">
    128. 

  128. <tt class="descclassname">BaseBackend.</tt><tt class="descname">get_status</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.get_status" title="Permalink to this definition">¶</a></dt>
    129. 

  129. <dd>Get the status of a task.</dd></dl>
    130. 

  130. 

  131. <dl class="method">
    132. 

  132. <dt id="celery.backends.base.BaseBackend.is_done">
    133. 

  133. <tt class="descclassname">BaseBackend.</tt><tt class="descname">is_done</tt><big>(</big><em>task_id</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.is_done" title="Permalink to this definition">¶</a></dt>
    134. 

  134. <dd>Returns <tt class="xref docutils literal"><span class="pre">True</span></tt> if the task was successfully executed.</dd></dl>
    135. 

  135. 

  136. <dl class="method">
    137. 

  137. <dt id="celery.backends.base.BaseBackend.mark_as_done">
    138. 

  138. <tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_done</tt><big>(</big><em>task_id</em>, <em>result</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_done" title="Permalink to this definition">¶</a></dt>
    139. 

  139. <dd>Mark task as successfully executed.</dd></dl>
    140. 

  140. 

  141. <dl class="method">
    142. 

  142. <dt id="celery.backends.base.BaseBackend.mark_as_failure">
    143. 

  143. <tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_failure</tt><big>(</big><em>task_id</em>, <em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_failure" title="Permalink to this definition">¶</a></dt>
    144. 

  144. <dd>Mark task as executed with failure. Stores the execption.</dd></dl>
    145. 

  145. 

  146. <dl class="method">
    147. 

  147. <dt id="celery.backends.base.BaseBackend.mark_as_retry">
    148. 

  148. <tt class="descclassname">BaseBackend.</tt><tt class="descname">mark_as_retry</tt><big>(</big><em>task_id</em>, <em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.mark_as_retry" title="Permalink to this definition">¶</a></dt>
    149. 

  149. <dd>Mark task for retry.</dd></dl>
    150. 

  150. 

  151. <dl class="method">
    152. 

  152. <dt id="celery.backends.base.BaseBackend.prepare_exception">
    153. 

  153. <tt class="descclassname">BaseBackend.</tt><tt class="descname">prepare_exception</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.prepare_exception" title="Permalink to this definition">¶</a></dt>
    154. 

  154. <dd>Prepare exception for serialization.</dd></dl>
    155. 

  155. 

  156. <dl class="method">
    157. 

  157. <dt id="celery.backends.base.BaseBackend.prepare_result">
    158. 

  158. <tt class="descclassname">BaseBackend.</tt><tt class="descname">prepare_result</tt><big>(</big><em>result</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.prepare_result" title="Permalink to this definition">¶</a></dt>
    159. 

  159. <dd>Prepare result for storage.</dd></dl>
    160. 

  160. 

  161. <dl class="method">
    162. 

  162. <dt id="celery.backends.base.BaseBackend.store_result">
    163. 

  163. <tt class="descclassname">BaseBackend.</tt><tt class="descname">store_result</tt><big>(</big><em>task_id</em>, <em>result</em>, <em>status</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.store_result" title="Permalink to this definition">¶</a></dt>
    164. 

  164. <dd>Store the result and status of a task.</dd></dl>
    165. 

  165. 

  166. <dl class="method">
    167. 

  167. <dt id="celery.backends.base.BaseBackend.wait_for">
    168. 

  168. <tt class="descclassname">BaseBackend.</tt><tt class="descname">wait_for</tt><big>(</big><em>task_id</em>, <em>timeout=None</em><big>)</big><a class="headerlink" href="#celery.backends.base.BaseBackend.wait_for" title="Permalink to this definition">¶</a></dt>
    169. 

  169. <dd><p>Wait for task and return its result.</p>
    170. 

  170. <p>If the task raises an exception, this exception
    171. 

  171. will be re-raised by <a title="celery.backends.base.BaseBackend.wait_for" class="reference internal" href="#celery.backends.base.BaseBackend.wait_for"><tt class="xref docutils literal"><span class="pre">wait_for()</span></tt></a>.</p>
    172. 

  172. <p>If <tt class="docutils literal"><span class="pre">timeout</span></tt> is not <tt class="xref docutils literal"><span class="pre">None</span></tt>, this raises the
    173. 

  173. <a title="celery.timer.TimeoutError" class="reference external" href="celery.timer.html#celery.timer.TimeoutError"><tt class="xref docutils literal"><span class="pre">celery.timer.TimeoutError</span></tt></a> exception if the operation takes
    174. 

  174. longer than <tt class="docutils literal"><span class="pre">timeout</span></tt> seconds.</p>
    175. 

  175. </dd></dl>
    176. 

  176. 

  177. </dd></dl>
    178. 

  178. 

  179. <dl class="exception">
    180. 

  180. <dt id="celery.backends.base.UnpickleableExceptionWrapper">
    181. 

  181. <em class="property">
    182. 

  182. exception </em><tt class="descclassname">celery.backends.base.</tt><tt class="descname">UnpickleableExceptionWrapper</tt><big>(</big><em>exc_module</em>, <em>exc_cls_name</em>, <em>exc_args</em><big>)</big><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper" title="Permalink to this definition">¶</a></dt>
    183. 

  183. <dd><p>Wraps unpickleable exceptions.</p>
    184. 

  184. <table class="docutils field-list" frame="void" rules="none">
    185. 

  185. <col class="field-name" />
    186. 

  186. <col class="field-body" />
    187. 

  187. <tbody valign="top">
    188. 

  188. <tr class="field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
    189. 

  189. <li><em>exc_module</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_module" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_module"><tt class="xref docutils literal"><span class="pre">exc_module</span></tt></a>.</li>
    190. 

  190. <li><em>exc_cls_name</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name"><tt class="xref docutils literal"><span class="pre">exc_cls_name</span></tt></a>.</li>
    191. 

  191. <li><em>exc_args</em> &#8211; see <a title="celery.backends.base.UnpickleableExceptionWrapper.exc_args" class="reference internal" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_args"><tt class="xref docutils literal"><span class="pre">exc_args</span></tt></a></li>
    192. 

  192. </ul>
    193. 

  193. </td>
    194. 

  194. </tr>
    195. 

  195. </tbody>
    196. 

  196. </table>
    197. 

  197. <dl class="attribute">
    198. 

  198. <dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_module">
    199. 

  199. <tt class="descname">exc_module</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_module" title="Permalink to this definition">¶</a></dt>
    200. 

  200. <dd>The module of the original exception.</dd></dl>
    201. 

  201. 

  202. <dl class="attribute">
    203. 

  203. <dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name">
    204. 

  204. <tt class="descname">exc_cls_name</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_cls_name" title="Permalink to this definition">¶</a></dt>
    205. 

  205. <dd>The name of the original exception class.</dd></dl>
    206. 

  206. 

  207. <dl class="attribute">
    208. 

  208. <dt id="celery.backends.base.UnpickleableExceptionWrapper.exc_args">
    209. 

  209. <tt class="descname">exc_args</tt><a class="headerlink" href="#celery.backends.base.UnpickleableExceptionWrapper.exc_args" title="Permalink to this definition">¶</a></dt>
    210. 

  210. <dd>The arguments for the original exception.</dd></dl>
    211. 

  211. 

  212. <p>Example</p>
    213. 

  213. <div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="k">try</span><span class="p">:</span>
    214. 

  214. <span class="gp">... </span>    <span class="n">something_raising_unpickleable_exc</span><span class="p">()</span>
    215. 

  215. <span class="gp">&gt;&gt;&gt; </span><span class="k">except</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
    216. 

  216. <span class="gp">... </span>    <span class="n">exc</span> <span class="o">=</span> <span class="n">UnpickleableException</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__module__</span><span class="p">,</span>
    217. 

  217. <span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span>
    218. 

  218. <span class="gp">... </span>                                <span class="n">e</span><span class="o">.</span><span class="n">args</span><span class="p">)</span>
    219. 

  219. <span class="gp">... </span>    <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span> <span class="c"># Works fine.</span>
    220. 

  220. </pre></div>
    221. 

  221. </div>
    222. 

  222. </dd></dl>
    223. 

  223. 

  224. <dl class="function">
    225. 

  225. <dt id="celery.backends.base.find_nearest_pickleable_exception">
    226. 

  226. <tt class="descclassname">celery.backends.base.</tt><tt class="descname">find_nearest_pickleable_exception</tt><big>(</big><em>exc</em><big>)</big><a class="headerlink" href="#celery.backends.base.find_nearest_pickleable_exception" title="Permalink to this definition">¶</a></dt>
    227. 

  227. <dd><p>With an exception instance, iterate over its super classes (by mro)
    228. 

  228. and find the first super exception that is pickleable. It does
    229. 

  229. not go below <tt class="xref docutils literal"><span class="pre">Exception</span></tt> (i.e. it skips <tt class="xref docutils literal"><span class="pre">Exception</span></tt>,
    230. 

  230. <tt class="xref docutils literal"><span class="pre">BaseException</span></tt> and <tt class="xref docutils literal"><span class="pre">object</span></tt>). If that happens
    231. 

  231. you should use <tt class="xref docutils literal"><span class="pre">UnpickleableException</span></tt> instead.</p>
    232. 

  232. <table class="docutils field-list" frame="void" rules="none">
    233. 

  233. <col class="field-name" />
    234. 

  234. <col class="field-body" />
    235. 

  235. <tbody valign="top">
    236. 

  236. <tr class="field"><th class="field-name">Parameter:</th><td class="field-body"><em>exc</em> &#8211; An exception instance.</td>
    237. 

  237. </tr>
    238. 

  238. <tr class="field"><th class="field-name">Returns:</th><td class="field-body">the nearest exception if it&#8217;s not <tt class="xref docutils literal"><span class="pre">Exception</span></tt> or below,
    239. 

  239. if it is it returns <tt class="xref docutils literal"><span class="pre">None</span></tt>.</td>
    240. 

  240. </tr>
    241. 

  241. <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><tt class="xref docutils literal"><span class="pre">Exception</span></tt></td>
    242. 

  242. </tr>
    243. 

  243. </tbody>
    244. 

  244. </table>
    245. 

  245. </dd></dl>
    246. 

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    257. 

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