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<h1>Source code for cassandra.io.twistedreactor</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright DataStax, Inc.</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the "License");</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="sd">"""</span>
<span class="sd">Module that implements an event loop based on twisted</span>
<span class="sd">( https://twistedmatrix.com ).</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">atexit</span>
<span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">partial</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">from</span> <span class="nn">threading</span> <span class="k">import</span> <span class="n">Thread</span><span class="p">,</span> <span class="n">Lock</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">from</span> <span class="nn">twisted.internet</span> <span class="k">import</span> <span class="n">reactor</span><span class="p">,</span> <span class="n">protocol</span>
<span class="kn">import</span> <span class="nn">weakref</span>
<span class="kn">from</span> <span class="nn">cassandra.connection</span> <span class="k">import</span> <span class="n">Connection</span><span class="p">,</span> <span class="n">ConnectionShutdown</span><span class="p">,</span> <span class="n">Timer</span><span class="p">,</span> <span class="n">TimerManager</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_cleanup</span><span class="p">(</span><span class="n">cleanup_weakref</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">cleanup_weakref</span><span class="p">()</span><span class="o">.</span><span class="n">_cleanup</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">ReferenceError</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">class</span> <span class="nc">TwistedConnectionProtocol</span><span class="p">(</span><span class="n">protocol</span><span class="o">.</span><span class="n">Protocol</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Twisted Protocol class for handling data received and connection</span>
<span class="sd"> made events.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">dataReceived</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Callback function that is called when data has been received</span>
<span class="sd"> on the connection.</span>
<span class="sd"> Reaches back to the Connection object and queues the data for</span>
<span class="sd"> processing.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">transport</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">factory</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">transport</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">factory</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">handle_read</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">connectionMade</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Callback function that is called when a connection has succeeded.</span>
<span class="sd"> Reaches back to the Connection object and confirms that the connection</span>
<span class="sd"> is ready.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">transport</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">factory</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">client_connection_made</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">connectionLost</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">reason</span><span class="p">):</span>
<span class="c1"># reason is a Failure instance</span>
<span class="bp">self</span><span class="o">.</span><span class="n">transport</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">factory</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">reason</span><span class="o">.</span><span class="n">value</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">TwistedConnectionClientFactory</span><span class="p">(</span><span class="n">protocol</span><span class="o">.</span><span class="n">ClientFactory</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">connection</span><span class="p">):</span>
<span class="c1"># ClientFactory does not define __init__() in parent classes</span>
<span class="c1"># and does not inherit from object.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conn</span> <span class="o">=</span> <span class="n">connection</span>
<span class="k">def</span> <span class="nf">buildProtocol</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">addr</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Twisted function that defines which kind of protocol to use</span>
<span class="sd"> in the ClientFactory.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">TwistedConnectionProtocol</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">clientConnectionFailed</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">connector</span><span class="p">,</span> <span class="n">reason</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Overridden twisted callback which is called when the</span>
<span class="sd"> connection attempt fails.</span>
<span class="sd"> """</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Connect failed: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">reason</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">reason</span><span class="o">.</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">clientConnectionLost</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">connector</span><span class="p">,</span> <span class="n">reason</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Overridden twisted callback which is called when the</span>
<span class="sd"> connection goes away (cleanly or otherwise).</span>
<span class="sd"> It should be safe to call defunct() here instead of just close, because</span>
<span class="sd"> we can assume that if the connection was closed cleanly, there are no</span>
<span class="sd"> requests to error out. If this assumption turns out to be false, we</span>
<span class="sd"> can call close() instead of defunct() when "reason" is an appropriate</span>
<span class="sd"> type.</span>
<span class="sd"> """</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Connect lost: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">reason</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">reason</span><span class="o">.</span><span class="n">value</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">TwistedLoop</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="n">_lock</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_thread</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_timeout_task</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_timeout</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_lock</span> <span class="o">=</span> <span class="n">Lock</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timers</span> <span class="o">=</span> <span class="n">TimerManager</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">maybe_start</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">reactor</span><span class="o">.</span><span class="n">running</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_thread</span> <span class="o">=</span> <span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">reactor</span><span class="o">.</span><span class="n">run</span><span class="p">,</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"cassandra_driver_event_loop"</span><span class="p">,</span>
<span class="n">kwargs</span><span class="o">=</span><span class="p">{</span><span class="s1">'installSignalHandlers'</span><span class="p">:</span> <span class="kc">False</span><span class="p">})</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_thread</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="kc">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="n">atexit</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">partial</span><span class="p">(</span><span class="n">_cleanup</span><span class="p">,</span> <span class="n">weakref</span><span class="o">.</span><span class="n">ref</span><span class="p">(</span><span class="bp">self</span><span class="p">)))</span>
<span class="k">def</span> <span class="nf">_cleanup</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_thread</span><span class="p">:</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">callFromThread</span><span class="p">(</span><span class="n">reactor</span><span class="o">.</span><span class="n">stop</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_thread</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="mf">1.0</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_thread</span><span class="o">.</span><span class="n">is_alive</span><span class="p">():</span>
<span class="n">log</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">"Event loop thread could not be joined, so "</span>
<span class="s2">"shutdown may not be clean. Please call "</span>
<span class="s2">"Cluster.shutdown() to avoid this."</span><span class="p">)</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Event loop thread was joined"</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_timer</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">timer</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timers</span><span class="o">.</span><span class="n">add_timer</span><span class="p">(</span><span class="n">timer</span><span class="p">)</span>
<span class="c1"># callFromThread to schedule from the loop thread, where</span>
<span class="c1"># the timeout task can safely be modified</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">callFromThread</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_schedule_timeout</span><span class="p">,</span> <span class="n">timer</span><span class="o">.</span><span class="n">end</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_schedule_timeout</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">next_timeout</span><span class="p">):</span>
<span class="k">if</span> <span class="n">next_timeout</span><span class="p">:</span>
<span class="n">delay</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="n">next_timeout</span> <span class="o">-</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">(),</span> <span class="mi">0</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_timeout_task</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_timeout_task</span><span class="o">.</span><span class="n">active</span><span class="p">():</span>
<span class="k">if</span> <span class="n">next_timeout</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timeout_task</span><span class="o">.</span><span class="n">reset</span><span class="p">(</span><span class="n">delay</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span> <span class="o">=</span> <span class="n">next_timeout</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timeout_task</span> <span class="o">=</span> <span class="n">reactor</span><span class="o">.</span><span class="n">callLater</span><span class="p">(</span><span class="n">delay</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_on_loop_timer</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timeout</span> <span class="o">=</span> <span class="n">next_timeout</span>
<span class="k">def</span> <span class="nf">_on_loop_timer</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_timers</span><span class="o">.</span><span class="n">service_timeouts</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_schedule_timeout</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_timers</span><span class="o">.</span><span class="n">next_timeout</span><span class="p">)</span>
<div class="viewcode-block" id="TwistedConnection"><a class="viewcode-back" href="../../../api/cassandra/io/twistedreactor.html#cassandra.io.twistedreactor.TwistedConnection">[docs]</a><span class="k">class</span> <span class="nc">TwistedConnection</span><span class="p">(</span><span class="n">Connection</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> An implementation of :class:`.Connection` that utilizes the</span>
<span class="sd"> Twisted event loop.</span>
<span class="sd"> """</span>
<span class="n">_loop</span> <span class="o">=</span> <span class="kc">None</span>
<span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">initialize_reactor</span><span class="p">(</span><span class="bp">cls</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">cls</span><span class="o">.</span><span class="n">_loop</span><span class="p">:</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">_loop</span> <span class="o">=</span> <span class="n">TwistedLoop</span><span class="p">()</span>
<span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">create_timer</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">timeout</span><span class="p">,</span> <span class="n">callback</span><span class="p">):</span>
<span class="n">timer</span> <span class="o">=</span> <span class="n">Timer</span><span class="p">(</span><span class="n">timeout</span><span class="p">,</span> <span class="n">callback</span><span class="p">)</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">_loop</span><span class="o">.</span><span class="n">add_timer</span><span class="p">(</span><span class="n">timer</span><span class="p">)</span>
<span class="k">return</span> <span class="n">timer</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Initialization method.</span>
<span class="sd"> Note that we can't call reactor methods directly here because</span>
<span class="sd"> it's not thread-safe, so we schedule the reactor/connection</span>
<span class="sd"> stuff to be run from the event loop thread when it gets the</span>
<span class="sd"> chance.</span>
<span class="sd"> """</span>
<span class="n">Connection</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span> <span class="o">=</span> <span class="kc">True</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connector</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">callFromThread</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">add_connection</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_loop</span><span class="o">.</span><span class="n">maybe_start</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">add_connection</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Convenience function to connect and store the resulting</span>
<span class="sd"> connector.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connector</span> <span class="o">=</span> <span class="n">reactor</span><span class="o">.</span><span class="n">connectTCP</span><span class="p">(</span>
<span class="n">host</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">port</span><span class="p">,</span>
<span class="n">factory</span><span class="o">=</span><span class="n">TwistedConnectionClientFactory</span><span class="p">(</span><span class="bp">self</span><span class="p">),</span>
<span class="n">timeout</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">connect_timeout</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">client_connection_made</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Called by twisted protocol when a connection attempt has</span>
<span class="sd"> succeeded.</span>
<span class="sd"> """</span>
<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">lock</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span> <span class="o">=</span> <span class="kc">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_send_options_message</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">close</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Disconnect and error-out all requests.</span>
<span class="sd"> """</span>
<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">lock</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span><span class="p">:</span>
<span class="k">return</span>
<span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Closing connection (</span><span class="si">%s</span><span class="s2">) to </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="nb">id</span><span class="p">(</span><span class="bp">self</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">host</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">disconnect</span><span class="p">()</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Closed socket to </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">host</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">error_all_requests</span><span class="p">(</span>
<span class="n">ConnectionShutdown</span><span class="p">(</span><span class="s2">"Connection to </span><span class="si">%s</span><span class="s2"> was closed"</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">host</span><span class="p">))</span>
<span class="c1"># don't leave in-progress operations hanging</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connected_event</span><span class="o">.</span><span class="n">set</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">handle_read</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Process the incoming data buffer.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">process_io_buffer</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">push</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This function is called when outgoing data should be queued</span>
<span class="sd"> for sending.</span>
<span class="sd"> Note that we can't call transport.write() directly because</span>
<span class="sd"> it is not thread-safe, so we schedule it to run from within</span>
<span class="sd"> the event loop when it gets the chance.</span>
<span class="sd"> """</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">callFromThread</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">connector</span><span class="o">.</span><span class="n">transport</span><span class="o">.</span><span class="n">write</span><span class="p">,</span> <span class="n">data</span><span class="p">)</span></div>
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