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<h1>Source code for cassandra.connection</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="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span> <span class="c1"># to enable import io from stdlib</span>
<span class="kn">from</span> <span class="nn">collections</span> <span class="k">import</span> <span class="n">defaultdict</span><span class="p">,</span> <span class="n">deque</span>
<span class="kn">import</span> <span class="nn">errno</span>
<span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">wraps</span><span class="p">,</span> <span class="n">partial</span>
<span class="kn">from</span> <span class="nn">heapq</span> <span class="k">import</span> <span class="n">heappush</span><span class="p">,</span> <span class="n">heappop</span>
<span class="kn">import</span> <span class="nn">io</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">six</span>
<span class="kn">from</span> <span class="nn">six.moves</span> <span class="k">import</span> <span class="nb">range</span>
<span class="kn">import</span> <span class="nn">socket</span>
<span class="kn">import</span> <span class="nn">struct</span>
<span class="kn">import</span> <span class="nn">sys</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">Event</span><span class="p">,</span> <span class="n">RLock</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">ssl</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">ssl</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># NOQA</span>
<span class="k">if</span> <span class="s1">'gevent.monkey'</span> <span class="ow">in</span> <span class="n">sys</span><span class="o">.</span><span class="n">modules</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">gevent.queue</span> <span class="k">import</span> <span class="n">Queue</span><span class="p">,</span> <span class="n">Empty</span>
<span class="k">else</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">six.moves.queue</span> <span class="k">import</span> <span class="n">Queue</span><span class="p">,</span> <span class="n">Empty</span> <span class="c1"># noqa</span>
<span class="kn">from</span> <span class="nn">cassandra</span> <span class="k">import</span> <span class="n">ConsistencyLevel</span><span class="p">,</span> <span class="n">AuthenticationFailed</span><span class="p">,</span> <span class="n">OperationTimedOut</span><span class="p">,</span> <span class="n">ProtocolVersion</span>
<span class="kn">from</span> <span class="nn">cassandra.marshal</span> <span class="k">import</span> <span class="n">int32_pack</span>
<span class="kn">from</span> <span class="nn">cassandra.protocol</span> <span class="k">import</span> <span class="p">(</span><span class="n">ReadyMessage</span><span class="p">,</span> <span class="n">AuthenticateMessage</span><span class="p">,</span> <span class="n">OptionsMessage</span><span class="p">,</span>
<span class="n">StartupMessage</span><span class="p">,</span> <span class="n">ErrorMessage</span><span class="p">,</span> <span class="n">CredentialsMessage</span><span class="p">,</span>
<span class="n">QueryMessage</span><span class="p">,</span> <span class="n">ResultMessage</span><span class="p">,</span> <span class="n">ProtocolHandler</span><span class="p">,</span>
<span class="n">InvalidRequestException</span><span class="p">,</span> <span class="n">SupportedMessage</span><span class="p">,</span>
<span class="n">AuthResponseMessage</span><span class="p">,</span> <span class="n">AuthChallengeMessage</span><span class="p">,</span>
<span class="n">AuthSuccessMessage</span><span class="p">,</span> <span class="n">ProtocolException</span><span class="p">,</span>
<span class="n">RegisterMessage</span><span class="p">)</span>
<span class="kn">from</span> <span class="nn">cassandra.util</span> <span class="k">import</span> <span class="n">OrderedDict</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="c1"># We use an ordered dictionary and specifically add lz4 before</span>
<span class="c1"># snappy so that lz4 will be preferred. Changing the order of this</span>
<span class="c1"># will change the compression preferences for the driver.</span>
<span class="n">locally_supported_compressions</span> <span class="o">=</span> <span class="n">OrderedDict</span><span class="p">()</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">lz4</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># The compress and decompress functions we need were moved from the lz4 to</span>
<span class="c1"># the lz4.block namespace, so we try both here.</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">lz4</span> <span class="k">import</span> <span class="n">block</span> <span class="k">as</span> <span class="n">lz4_block</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="n">lz4_block</span> <span class="o">=</span> <span class="n">lz4</span>
<span class="c1"># Cassandra writes the uncompressed message length in big endian order,</span>
<span class="c1"># but the lz4 lib requires little endian order, so we wrap these</span>
<span class="c1"># functions to handle that</span>
<span class="k">def</span> <span class="nf">lz4_compress</span><span class="p">(</span><span class="n">byts</span><span class="p">):</span>
<span class="c1"># write length in big-endian instead of little-endian</span>
<span class="k">return</span> <span class="n">int32_pack</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">byts</span><span class="p">))</span> <span class="o">+</span> <span class="n">lz4_block</span><span class="o">.</span><span class="n">compress</span><span class="p">(</span><span class="n">byts</span><span class="p">)[</span><span class="mi">4</span><span class="p">:]</span>
<span class="k">def</span> <span class="nf">lz4_decompress</span><span class="p">(</span><span class="n">byts</span><span class="p">):</span>
<span class="c1"># flip from big-endian to little-endian</span>
<span class="k">return</span> <span class="n">lz4_block</span><span class="o">.</span><span class="n">decompress</span><span class="p">(</span><span class="n">byts</span><span class="p">[</span><span class="mi">3</span><span class="p">::</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">+</span> <span class="n">byts</span><span class="p">[</span><span class="mi">4</span><span class="p">:])</span>
<span class="n">locally_supported_compressions</span><span class="p">[</span><span class="s1">'lz4'</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">lz4_compress</span><span class="p">,</span> <span class="n">lz4_decompress</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">import</span> <span class="nn">snappy</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># work around apparently buggy snappy decompress</span>
<span class="k">def</span> <span class="nf">decompress</span><span class="p">(</span><span class="n">byts</span><span class="p">):</span>
<span class="k">if</span> <span class="n">byts</span> <span class="o">==</span> <span class="s1">'</span><span class="se">\x00</span><span class="s1">'</span><span class="p">:</span>
<span class="k">return</span> <span class="s1">''</span>
<span class="k">return</span> <span class="n">snappy</span><span class="o">.</span><span class="n">decompress</span><span class="p">(</span><span class="n">byts</span><span class="p">)</span>
<span class="n">locally_supported_compressions</span><span class="p">[</span><span class="s1">'snappy'</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">snappy</span><span class="o">.</span><span class="n">compress</span><span class="p">,</span> <span class="n">decompress</span><span class="p">)</span>
<span class="n">PROTOCOL_VERSION_MASK</span> <span class="o">=</span> <span class="mh">0x7f</span>
<span class="n">HEADER_DIRECTION_FROM_CLIENT</span> <span class="o">=</span> <span class="mh">0x00</span>
<span class="n">HEADER_DIRECTION_TO_CLIENT</span> <span class="o">=</span> <span class="mh">0x80</span>
<span class="n">HEADER_DIRECTION_MASK</span> <span class="o">=</span> <span class="mh">0x80</span>
<span class="n">frame_header_v1_v2</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">Struct</span><span class="p">(</span><span class="s1">'>BbBi'</span><span class="p">)</span>
<span class="n">frame_header_v3</span> <span class="o">=</span> <span class="n">struct</span><span class="o">.</span><span class="n">Struct</span><span class="p">(</span><span class="s1">'>BhBi'</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">_Frame</span><span class="p">(</span><span class="nb">object</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">version</span><span class="p">,</span> <span class="n">flags</span><span class="p">,</span> <span class="n">stream</span><span class="p">,</span> <span class="n">opcode</span><span class="p">,</span> <span class="n">body_offset</span><span class="p">,</span> <span class="n">end_pos</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">version</span> <span class="o">=</span> <span class="n">version</span>
<span class="bp">self</span><span class="o">.</span><span class="n">flags</span> <span class="o">=</span> <span class="n">flags</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stream</span> <span class="o">=</span> <span class="n">stream</span>
<span class="bp">self</span><span class="o">.</span><span class="n">opcode</span> <span class="o">=</span> <span class="n">opcode</span>
<span class="bp">self</span><span class="o">.</span><span class="n">body_offset</span> <span class="o">=</span> <span class="n">body_offset</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end_pos</span> <span class="o">=</span> <span class="n">end_pos</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span> <span class="c1"># facilitates testing</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">_Frame</span><span class="p">):</span>
<span class="k">return</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">version</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">version</span> <span class="ow">and</span>
<span class="bp">self</span><span class="o">.</span><span class="n">flags</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">flags</span> <span class="ow">and</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stream</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">stream</span> <span class="ow">and</span>
<span class="bp">self</span><span class="o">.</span><span class="n">opcode</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">opcode</span> <span class="ow">and</span>
<span class="bp">self</span><span class="o">.</span><span class="n">body_offset</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">body_offset</span> <span class="ow">and</span>
<span class="bp">self</span><span class="o">.</span><span class="n">end_pos</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">end_pos</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"ver(</span><span class="si">{0}</span><span class="s2">); flags(</span><span class="si">{1:04b}</span><span class="s2">); stream(</span><span class="si">{2}</span><span class="s2">); op(</span><span class="si">{3}</span><span class="s2">); offset(</span><span class="si">{4}</span><span class="s2">); len(</span><span class="si">{5}</span><span class="s2">)"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">version</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">flags</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">stream</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">opcode</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">body_offset</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">end_pos</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">body_offset</span><span class="p">)</span>
<span class="n">NONBLOCKING</span> <span class="o">=</span> <span class="p">(</span><span class="n">errno</span><span class="o">.</span><span class="n">EAGAIN</span><span class="p">,</span> <span class="n">errno</span><span class="o">.</span><span class="n">EWOULDBLOCK</span><span class="p">)</span>
<div class="viewcode-block" id="ConnectionException"><a class="viewcode-back" href="../../api/cassandra/connection.html#cassandra.connection.ConnectionException">[docs]</a><span class="k">class</span> <span class="nc">ConnectionException</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> An unrecoverable error was hit when attempting to use a connection,</span>
<span class="sd"> or the connection was already closed or defunct.</span>
<span class="sd"> """</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">message</span><span class="p">,</span> <span class="n">host</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="ne">Exception</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="n">message</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">host</span> <span class="o">=</span> <span class="n">host</span></div>
<div class="viewcode-block" id="ConnectionShutdown"><a class="viewcode-back" href="../../api/cassandra/connection.html#cassandra.connection.ConnectionShutdown">[docs]</a><span class="k">class</span> <span class="nc">ConnectionShutdown</span><span class="p">(</span><span class="n">ConnectionException</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Raised when a connection has been marked as defunct or has been closed.</span>
<span class="sd"> """</span>
<span class="k">pass</span></div>
<span class="k">class</span> <span class="nc">ProtocolVersionUnsupported</span><span class="p">(</span><span class="n">ConnectionException</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Server rejected startup message due to unsupported protocol version</span>
<span class="sd"> """</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">host</span><span class="p">,</span> <span class="n">startup_version</span><span class="p">):</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s2">"Unsupported protocol version on </span><span class="si">%s</span><span class="s2">: </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">host</span><span class="p">,</span> <span class="n">startup_version</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">ProtocolVersionUnsupported</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">host</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">startup_version</span> <span class="o">=</span> <span class="n">startup_version</span>
<div class="viewcode-block" id="ConnectionBusy"><a class="viewcode-back" href="../../api/cassandra/connection.html#cassandra.connection.ConnectionBusy">[docs]</a><span class="k">class</span> <span class="nc">ConnectionBusy</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> An attempt was made to send a message through a :class:`.Connection` that</span>
<span class="sd"> was already at the max number of in-flight operations.</span>
<span class="sd"> """</span>
<span class="k">pass</span></div>
<div class="viewcode-block" id="ProtocolError"><a class="viewcode-back" href="../../api/cassandra/connection.html#cassandra.connection.ProtocolError">[docs]</a><span class="k">class</span> <span class="nc">ProtocolError</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Communication did not match the protocol that this driver expects.</span>
<span class="sd"> """</span>
<span class="k">pass</span></div>
<span class="k">def</span> <span class="nf">defunct_on_error</span><span class="p">(</span><span class="n">f</span><span class="p">):</span>
<span class="nd">@wraps</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">wrapper</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="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">f</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="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">exc</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span>
<span class="k">return</span> <span class="n">wrapper</span>
<span class="n">DEFAULT_CQL_VERSION</span> <span class="o">=</span> <span class="s1">'3.0.0'</span>
<span class="k">if</span> <span class="n">six</span><span class="o">.</span><span class="n">PY3</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">int_from_buf_item</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
<span class="k">return</span> <span class="n">i</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">int_from_buf_item</span> <span class="o">=</span> <span class="nb">ord</span>
<span class="k">class</span> <span class="nc">Connection</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="n">CALLBACK_ERR_THREAD_THRESHOLD</span> <span class="o">=</span> <span class="mi">100</span>
<span class="n">in_buffer_size</span> <span class="o">=</span> <span class="mi">4096</span>
<span class="n">out_buffer_size</span> <span class="o">=</span> <span class="mi">4096</span>
<span class="n">cql_version</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">no_compact</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">protocol_version</span> <span class="o">=</span> <span class="n">ProtocolVersion</span><span class="o">.</span><span class="n">MAX_SUPPORTED</span>
<span class="n">keyspace</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">compression</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">compressor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">decompressor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">ssl_options</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">last_error</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># The current number of operations that are in flight. More precisely,</span>
<span class="c1"># the number of request IDs that are currently in use.</span>
<span class="n">in_flight</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># Max concurrent requests allowed per connection. This is set optimistically high, allowing</span>
<span class="c1"># all request ids to be used in protocol version 3+. Normally concurrency would be controlled</span>
<span class="c1"># at a higher level by the application or concurrent.execute_concurrent. This attribute</span>
<span class="c1"># is for lower-level integrations that want some upper bound without reimplementing.</span>
<span class="n">max_in_flight</span> <span class="o">=</span> <span class="mi">2</span> <span class="o">**</span> <span class="mi">15</span>
<span class="c1"># A set of available request IDs. When using the v3 protocol or higher,</span>
<span class="c1"># this will not initially include all request IDs in order to save memory,</span>
<span class="c1"># but the set will grow if it is exhausted.</span>
<span class="n">request_ids</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># Tracks the highest used request ID in order to help with growing the</span>
<span class="c1"># request_ids set</span>
<span class="n">highest_request_id</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">is_defunct</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">is_closed</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">lock</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">user_type_map</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">msg_received</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">is_unsupported_proto_version</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">is_control_connection</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">signaled_error</span> <span class="o">=</span> <span class="kc">False</span> <span class="c1"># used for flagging at the pool level</span>
<span class="n">allow_beta_protocol_version</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">_iobuf</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_current_frame</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_socket</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">_socket_impl</span> <span class="o">=</span> <span class="n">socket</span>
<span class="n">_ssl_impl</span> <span class="o">=</span> <span class="n">ssl</span>
<span class="n">_check_hostname</span> <span class="o">=</span> <span class="kc">False</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">host</span><span class="o">=</span><span class="s1">'127.0.0.1'</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">9042</span><span class="p">,</span> <span class="n">authenticator</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">ssl_options</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">sockopts</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="n">cql_version</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">protocol_version</span><span class="o">=</span><span class="n">ProtocolVersion</span><span class="o">.</span><span class="n">MAX_SUPPORTED</span><span class="p">,</span> <span class="n">is_control_connection</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">user_type_map</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">connect_timeout</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">allow_beta_protocol_version</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">no_compact</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">host</span> <span class="o">=</span> <span class="n">host</span>
<span class="bp">self</span><span class="o">.</span><span class="n">port</span> <span class="o">=</span> <span class="n">port</span>
<span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span> <span class="o">=</span> <span class="n">authenticator</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ssl_options</span> <span class="o">=</span> <span class="n">ssl_options</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span> <span class="k">if</span> <span class="n">ssl_options</span> <span class="k">else</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">sockopts</span> <span class="o">=</span> <span class="n">sockopts</span>
<span class="bp">self</span><span class="o">.</span><span class="n">compression</span> <span class="o">=</span> <span class="n">compression</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span> <span class="o">=</span> <span class="n">cql_version</span>
<span class="bp">self</span><span class="o">.</span><span class="n">protocol_version</span> <span class="o">=</span> <span class="n">protocol_version</span>
<span class="bp">self</span><span class="o">.</span><span class="n">is_control_connection</span> <span class="o">=</span> <span class="n">is_control_connection</span>
<span class="bp">self</span><span class="o">.</span><span class="n">user_type_map</span> <span class="o">=</span> <span class="n">user_type_map</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connect_timeout</span> <span class="o">=</span> <span class="n">connect_timeout</span>
<span class="bp">self</span><span class="o">.</span><span class="n">allow_beta_protocol_version</span> <span class="o">=</span> <span class="n">allow_beta_protocol_version</span>
<span class="bp">self</span><span class="o">.</span><span class="n">no_compact</span> <span class="o">=</span> <span class="n">no_compact</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_push_watchers</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_requests</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span> <span class="o">=</span> <span class="n">io</span><span class="o">.</span><span class="n">BytesIO</span><span class="p">()</span>
<span class="k">if</span> <span class="n">ssl_options</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_check_hostname</span> <span class="o">=</span> <span class="nb">bool</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">ssl_options</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s1">'check_hostname'</span><span class="p">,</span> <span class="kc">False</span><span class="p">))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_check_hostname</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">ssl</span><span class="p">,</span> <span class="s1">'match_hostname'</span><span class="p">,</span> <span class="kc">None</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"ssl_options specify 'check_hostname', but ssl.match_hostname is not provided. "</span>
<span class="s2">"Patch or upgrade Python to use this option."</span><span class="p">)</span>
<span class="k">if</span> <span class="n">protocol_version</span> <span class="o">>=</span> <span class="mi">3</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">max_in_flight</span> <span class="o">-</span> <span class="mi">1</span><span class="p">,</span> <span class="p">(</span><span class="mi">2</span> <span class="o">**</span> <span class="mi">15</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
<span class="c1"># Don't fill the deque with 2**15 items right away. Start with some and add</span>
<span class="c1"># more if needed.</span>
<span class="n">initial_size</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="mi">300</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_in_flight</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">request_ids</span> <span class="o">=</span> <span class="n">deque</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">initial_size</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">highest_request_id</span> <span class="o">=</span> <span class="n">initial_size</span> <span class="o">-</span> <span class="mi">1</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">max_in_flight</span><span class="p">,</span> <span class="p">(</span><span class="mi">2</span> <span class="o">**</span> <span class="mi">7</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">request_ids</span> <span class="o">=</span> <span class="n">deque</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span> <span class="o">+</span> <span class="mi">1</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">highest_request_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">lock</span> <span class="o">=</span> <span class="n">RLock</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connected_event</span> <span class="o">=</span> <span class="n">Event</span><span class="p">()</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="sd">"""</span>
<span class="sd"> Called once by Cluster.connect(). This should be used by implementations</span>
<span class="sd"> to set up any resources that will be shared across connections.</span>
<span class="sd"> """</span>
<span class="k">pass</span>
<span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">handle_fork</span><span class="p">(</span><span class="bp">cls</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Called after a forking. This should cleanup any remaining reactor state</span>
<span class="sd"> from the parent process.</span>
<span class="sd"> """</span>
<span class="k">pass</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="k">raise</span> <span class="ne">NotImplementedError</span><span class="p">()</span>
<span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">factory</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="n">timeout</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"> A factory function which returns connections which have</span>
<span class="sd"> succeeded in connecting and are ready for service (or</span>
<span class="sd"> raises an exception otherwise).</span>
<span class="sd"> """</span>
<span class="n">start</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="n">kwargs</span><span class="p">[</span><span class="s1">'connect_timeout'</span><span class="p">]</span> <span class="o">=</span> <span class="n">timeout</span>
<span class="n">conn</span> <span class="o">=</span> <span class="bp">cls</span><span class="p">(</span><span class="n">host</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="n">elapsed</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="o">-</span> <span class="n">start</span>
<span class="n">conn</span><span class="o">.</span><span class="n">connected_event</span><span class="o">.</span><span class="n">wait</span><span class="p">(</span><span class="n">timeout</span> <span class="o">-</span> <span class="n">elapsed</span><span class="p">)</span>
<span class="k">if</span> <span class="n">conn</span><span class="o">.</span><span class="n">last_error</span><span class="p">:</span>
<span class="k">if</span> <span class="n">conn</span><span class="o">.</span><span class="n">is_unsupported_proto_version</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ProtocolVersionUnsupported</span><span class="p">(</span><span class="n">host</span><span class="p">,</span> <span class="n">conn</span><span class="o">.</span><span class="n">protocol_version</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">conn</span><span class="o">.</span><span class="n">last_error</span>
<span class="k">elif</span> <span class="ow">not</span> <span class="n">conn</span><span class="o">.</span><span class="n">connected_event</span><span class="o">.</span><span class="n">is_set</span><span class="p">():</span>
<span class="n">conn</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">raise</span> <span class="n">OperationTimedOut</span><span class="p">(</span><span class="s2">"Timed out creating connection (</span><span class="si">%s</span><span class="s2"> seconds)"</span> <span class="o">%</span> <span class="n">timeout</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">conn</span>
<span class="k">def</span> <span class="nf">_connect_socket</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">sockerr</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">addresses</span> <span class="o">=</span> <span class="n">socket</span><span class="o">.</span><span class="n">getaddrinfo</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">port</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">AF_UNSPEC</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SOCK_STREAM</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">addresses</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ConnectionException</span><span class="p">(</span><span class="s2">"getaddrinfo returned empty list for </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</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">for</span> <span class="p">(</span><span class="n">af</span><span class="p">,</span> <span class="n">socktype</span><span class="p">,</span> <span class="n">proto</span><span class="p">,</span> <span class="n">canonname</span><span class="p">,</span> <span class="n">sockaddr</span><span class="p">)</span> <span class="ow">in</span> <span class="n">addresses</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_socket_impl</span><span class="o">.</span><span class="n">socket</span><span class="p">(</span><span class="n">af</span><span class="p">,</span> <span class="n">socktype</span><span class="p">,</span> <span class="n">proto</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">ssl_options</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">_ssl_impl</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s2">"This version of Python was not compiled with SSL support"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_ssl_impl</span><span class="o">.</span><span class="n">wrap_socket</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="p">,</span> <span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="n">ssl_options</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">settimeout</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">connect_timeout</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="n">sockaddr</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">settimeout</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_check_hostname</span><span class="p">:</span>
<span class="n">ssl</span><span class="o">.</span><span class="n">match_hostname</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">getpeercert</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="n">sockerr</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">break</span>
<span class="k">except</span> <span class="n">socket</span><span class="o">.</span><span class="n">error</span> <span class="k">as</span> <span class="n">err</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">sockerr</span> <span class="o">=</span> <span class="n">err</span>
<span class="k">if</span> <span class="n">sockerr</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">socket</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">sockerr</span><span class="o">.</span><span class="n">errno</span><span class="p">,</span> <span class="s2">"Tried connecting to </span><span class="si">%s</span><span class="s2">. Last error: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">([</span><span class="n">a</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">addresses</span><span class="p">],</span> <span class="n">sockerr</span><span class="o">.</span><span class="n">strerror</span> <span class="ow">or</span> <span class="n">sockerr</span><span class="p">))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">sockopts</span><span class="p">:</span>
<span class="k">for</span> <span class="n">args</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">sockopts</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_socket</span><span class="o">.</span><span class="n">setsockopt</span><span class="p">(</span><span class="o">*</span><span class="n">args</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="k">raise</span> <span class="ne">NotImplementedError</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">defunct</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc</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="bp">self</span><span class="o">.</span><span class="n">is_defunct</span> <span class="ow">or</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_defunct</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">exc_info</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span>
<span class="c1"># if we are not handling an exception, just use the passed exception, and don't try to format exc_info with the message</span>
<span class="k">if</span> <span class="nb">any</span><span class="p">(</span><span class="n">exc_info</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">"Defuncting 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="n">exc_info</span><span class="o">=</span><span class="n">exc_info</span><span class="p">)</span>
<span class="k">else</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">"Defuncting connection (</span><span class="si">%s</span><span class="s2">) to </span><span class="si">%s</span><span class="s2">: </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="n">exc</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">last_error</span> <span class="o">=</span> <span class="n">exc</span>
<span class="bp">self</span><span class="o">.</span><span class="n">close</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">exc</span><span class="p">)</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">return</span> <span class="n">exc</span>
<span class="k">def</span> <span class="nf">error_all_requests</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc</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="n">requests</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_requests</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_requests</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">requests</span><span class="p">:</span>
<span class="k">return</span>
<span class="n">new_exc</span> <span class="o">=</span> <span class="n">ConnectionShutdown</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">exc</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">try_callback</span><span class="p">(</span><span class="n">cb</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">cb</span><span class="p">(</span><span class="n">new_exc</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</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">"Ignoring unhandled exception while erroring requests for a "</span>
<span class="s2">"failed connection (</span><span class="si">%s</span><span class="s2">) to host </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="n">exc_info</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="c1"># run first callback from this thread to ensure pool state before leaving</span>
<span class="n">cb</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">requests</span><span class="o">.</span><span class="n">popitem</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span>
<span class="n">try_callback</span><span class="p">(</span><span class="n">cb</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">requests</span><span class="p">:</span>
<span class="k">return</span>
<span class="c1"># additional requests are optionally errored from a separate thread</span>
<span class="c1"># The default callback and retry logic is fairly expensive -- we don't</span>
<span class="c1"># want to tie up the event thread when there are many requests</span>
<span class="k">def</span> <span class="nf">err_all_callbacks</span><span class="p">():</span>
<span class="k">for</span> <span class="n">cb</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="ow">in</span> <span class="n">requests</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
<span class="n">try_callback</span><span class="p">(</span><span class="n">cb</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">requests</span><span class="p">)</span> <span class="o"><</span> <span class="n">Connection</span><span class="o">.</span><span class="n">CALLBACK_ERR_THREAD_THRESHOLD</span><span class="p">:</span>
<span class="n">err_all_callbacks</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># daemon thread here because we want to stay decoupled from the cluster TPE</span>
<span class="c1"># TODO: would it make sense to just have a driver-global TPE?</span>
<span class="n">t</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">err_all_callbacks</span><span class="p">)</span>
<span class="n">t</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">t</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">get_request_id</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This must be called while self.lock is held.</span>
<span class="sd"> """</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">request_ids</span><span class="o">.</span><span class="n">popleft</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">IndexError</span><span class="p">:</span>
<span class="n">new_request_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">highest_request_id</span> <span class="o">+</span> <span class="mi">1</span>
<span class="c1"># in_flight checks should guarantee this</span>
<span class="k">assert</span> <span class="n">new_request_id</span> <span class="o"><=</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">highest_request_id</span> <span class="o">=</span> <span class="n">new_request_id</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">highest_request_id</span>
<span class="k">def</span> <span class="nf">handle_pushed</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">response</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">"Message pushed from server: </span><span class="si">%r</span><span class="s2">"</span><span class="p">,</span> <span class="n">response</span><span class="p">)</span>
<span class="k">for</span> <span class="n">cb</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_push_watchers</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">event_type</span><span class="p">,</span> <span class="p">[]):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">cb</span><span class="p">(</span><span class="n">response</span><span class="o">.</span><span class="n">event_args</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s2">"Pushed event handler errored, ignoring:"</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">send_msg</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">msg</span><span class="p">,</span> <span class="n">request_id</span><span class="p">,</span> <span class="n">cb</span><span class="p">,</span> <span class="n">encoder</span><span class="o">=</span><span class="n">ProtocolHandler</span><span class="o">.</span><span class="n">encode_message</span><span class="p">,</span> <span class="n">decoder</span><span class="o">=</span><span class="n">ProtocolHandler</span><span class="o">.</span><span class="n">decode_message</span><span class="p">,</span> <span class="n">result_metadata</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ConnectionShutdown</span><span class="p">(</span><span class="s2">"Connection to </span><span class="si">%s</span><span class="s2"> is defunct"</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="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ConnectionShutdown</span><span class="p">(</span><span class="s2">"Connection to </span><span class="si">%s</span><span class="s2"> is 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"># queue the decoder function with the request</span>
<span class="c1"># this allows us to inject custom functions per request to encode, decode messages</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_requests</span><span class="p">[</span><span class="n">request_id</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">cb</span><span class="p">,</span> <span class="n">decoder</span><span class="p">,</span> <span class="n">result_metadata</span><span class="p">)</span>
<span class="n">msg</span> <span class="o">=</span> <span class="n">encoder</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">request_id</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">protocol_version</span><span class="p">,</span> <span class="n">compressor</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">compressor</span><span class="p">,</span> <span class="n">allow_beta_protocol_version</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">allow_beta_protocol_version</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">push</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">wait_for_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">msg</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">wait_for_responses</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="n">timeout</span><span class="p">)[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">wait_for_responses</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">msgs</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"> Returns a list of (success, response) tuples. If success</span>
<span class="sd"> is False, response will be an Exception. Otherwise, response</span>
<span class="sd"> will be the normal query response.</span>
<span class="sd"> If fail_on_error was left as True and one of the requests</span>
<span class="sd"> failed, the corresponding Exception will be raised.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ConnectionShutdown</span><span class="p">(</span><span class="s2">"Connection </span><span class="si">%s</span><span class="s2"> is already closed"</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="p">))</span>
<span class="n">timeout</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'timeout'</span><span class="p">)</span>
<span class="n">fail_on_error</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'fail_on_error'</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
<span class="n">waiter</span> <span class="o">=</span> <span class="n">ResponseWaiter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">msgs</span><span class="p">),</span> <span class="n">fail_on_error</span><span class="p">)</span>
<span class="c1"># busy wait for sufficient space on the connection</span>
<span class="n">messages_sent</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">needed</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">msgs</span><span class="p">)</span> <span class="o">-</span> <span class="n">messages_sent</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="n">available</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="n">needed</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">in_flight</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">request_ids</span> <span class="o">=</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">()</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">available</span><span class="p">)]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">in_flight</span> <span class="o">+=</span> <span class="n">available</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">request_id</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">request_ids</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">msgs</span><span class="p">[</span><span class="n">messages_sent</span> <span class="o">+</span> <span class="n">i</span><span class="p">],</span>
<span class="n">request_id</span><span class="p">,</span>
<span class="n">partial</span><span class="p">(</span><span class="n">waiter</span><span class="o">.</span><span class="n">got_response</span><span class="p">,</span> <span class="n">index</span><span class="o">=</span><span class="n">messages_sent</span> <span class="o">+</span> <span class="n">i</span><span class="p">))</span>
<span class="n">messages_sent</span> <span class="o">+=</span> <span class="n">available</span>
<span class="k">if</span> <span class="n">messages_sent</span> <span class="o">==</span> <span class="nb">len</span><span class="p">(</span><span class="n">msgs</span><span class="p">):</span>
<span class="k">break</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">if</span> <span class="n">timeout</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">timeout</span> <span class="o">-=</span> <span class="mf">0.01</span>
<span class="k">if</span> <span class="n">timeout</span> <span class="o"><=</span> <span class="mf">0.0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">OperationTimedOut</span><span class="p">()</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.01</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">waiter</span><span class="o">.</span><span class="n">deliver</span><span class="p">(</span><span class="n">timeout</span><span class="p">)</span>
<span class="k">except</span> <span class="n">OperationTimedOut</span><span class="p">:</span>
<span class="k">raise</span>
<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">exc</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span>
<span class="k">raise</span>
<span class="k">def</span> <span class="nf">register_watcher</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event_type</span><span class="p">,</span> <span class="n">callback</span><span class="p">,</span> <span class="n">register_timeout</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Register a callback for a given event type.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_push_watchers</span><span class="p">[</span><span class="n">event_type</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">callback</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">wait_for_response</span><span class="p">(</span>
<span class="n">RegisterMessage</span><span class="p">(</span><span class="n">event_list</span><span class="o">=</span><span class="p">[</span><span class="n">event_type</span><span class="p">]),</span>
<span class="n">timeout</span><span class="o">=</span><span class="n">register_timeout</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">register_watchers</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">type_callback_dict</span><span class="p">,</span> <span class="n">register_timeout</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Register multiple callback/event type pairs, expressed as a dict.</span>
<span class="sd"> """</span>
<span class="k">for</span> <span class="n">event_type</span><span class="p">,</span> <span class="n">callback</span> <span class="ow">in</span> <span class="n">type_callback_dict</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_push_watchers</span><span class="p">[</span><span class="n">event_type</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">callback</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">wait_for_response</span><span class="p">(</span>
<span class="n">RegisterMessage</span><span class="p">(</span><span class="n">event_list</span><span class="o">=</span><span class="n">type_callback_dict</span><span class="o">.</span><span class="n">keys</span><span class="p">()),</span>
<span class="n">timeout</span><span class="o">=</span><span class="n">register_timeout</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">control_conn_disposed</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">is_control_connection</span> <span class="o">=</span> <span class="kc">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_push_watchers</span> <span class="o">=</span> <span class="p">{}</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_read_frame_header</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">buf</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">getvalue</span><span class="p">()</span>
<span class="n">pos</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="n">buf</span><span class="p">)</span>
<span class="k">if</span> <span class="n">pos</span><span class="p">:</span>
<span class="n">version</span> <span class="o">=</span> <span class="n">int_from_buf_item</span><span class="p">(</span><span class="n">buf</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="o">&</span> <span class="n">PROTOCOL_VERSION_MASK</span>
<span class="k">if</span> <span class="n">version</span> <span class="o">></span> <span class="n">ProtocolVersion</span><span class="o">.</span><span class="n">MAX_SUPPORTED</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span><span class="s2">"This version of the driver does not support protocol version </span><span class="si">%d</span><span class="s2">"</span> <span class="o">%</span> <span class="n">version</span><span class="p">)</span>
<span class="n">frame_header</span> <span class="o">=</span> <span class="n">frame_header_v3</span> <span class="k">if</span> <span class="n">version</span> <span class="o">>=</span> <span class="mi">3</span> <span class="k">else</span> <span class="n">frame_header_v1_v2</span>
<span class="c1"># this frame header struct is everything after the version byte</span>
<span class="n">header_size</span> <span class="o">=</span> <span class="n">frame_header</span><span class="o">.</span><span class="n">size</span> <span class="o">+</span> <span class="mi">1</span>
<span class="k">if</span> <span class="n">pos</span> <span class="o">>=</span> <span class="n">header_size</span><span class="p">:</span>
<span class="n">flags</span><span class="p">,</span> <span class="n">stream</span><span class="p">,</span> <span class="n">op</span><span class="p">,</span> <span class="n">body_len</span> <span class="o">=</span> <span class="n">frame_header</span><span class="o">.</span><span class="n">unpack_from</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="k">if</span> <span class="n">body_len</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span><span class="s2">"Received negative body length: </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="n">body_len</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_current_frame</span> <span class="o">=</span> <span class="n">_Frame</span><span class="p">(</span><span class="n">version</span><span class="p">,</span> <span class="n">flags</span><span class="p">,</span> <span class="n">stream</span><span class="p">,</span> <span class="n">op</span><span class="p">,</span> <span class="n">header_size</span><span class="p">,</span> <span class="n">body_len</span> <span class="o">+</span> <span class="n">header_size</span><span class="p">)</span>
<span class="k">return</span> <span class="n">pos</span>
<span class="k">def</span> <span class="nf">_reset_frame</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">_iobuf</span> <span class="o">=</span> <span class="n">io</span><span class="o">.</span><span class="n">BytesIO</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">read</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span> <span class="c1"># io.SEEK_END == 2 (constant not present in 2.6)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_current_frame</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">def</span> <span class="nf">process_io_buffer</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">while</span> <span class="kc">True</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">_current_frame</span><span class="p">:</span>
<span class="n">pos</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_read_frame_header</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">pos</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">tell</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">_current_frame</span> <span class="ow">or</span> <span class="n">pos</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">_current_frame</span><span class="o">.</span><span class="n">end_pos</span><span class="p">:</span>
<span class="c1"># we don't have a complete header yet or we</span>
<span class="c1"># already saw a header, but we don't have a</span>
<span class="c1"># complete message yet</span>
<span class="k">return</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">frame</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_current_frame</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">seek</span><span class="p">(</span><span class="n">frame</span><span class="o">.</span><span class="n">body_offset</span><span class="p">)</span>
<span class="n">msg</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">frame</span><span class="o">.</span><span class="n">end_pos</span> <span class="o">-</span> <span class="n">frame</span><span class="o">.</span><span class="n">body_offset</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">process_msg</span><span class="p">(</span><span class="n">frame</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_reset_frame</span><span class="p">()</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">process_msg</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">header</span><span class="p">,</span> <span class="n">body</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">msg_received</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">stream_id</span> <span class="o">=</span> <span class="n">header</span><span class="o">.</span><span class="n">stream</span>
<span class="k">if</span> <span class="n">stream_id</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">callback</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">decoder</span> <span class="o">=</span> <span class="n">ProtocolHandler</span><span class="o">.</span><span class="n">decode_message</span>
<span class="n">result_metadata</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">callback</span><span class="p">,</span> <span class="n">decoder</span><span class="p">,</span> <span class="n">result_metadata</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_requests</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">stream_id</span><span class="p">)</span>
<span class="c1"># This can only happen if the stream_id was</span>
<span class="c1"># removed due to an OperationTimedOut</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="k">return</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">request_ids</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">stream_id</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">decoder</span><span class="p">(</span><span class="n">header</span><span class="o">.</span><span class="n">version</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">user_type_map</span><span class="p">,</span> <span class="n">stream_id</span><span class="p">,</span>
<span class="n">header</span><span class="o">.</span><span class="n">flags</span><span class="p">,</span> <span class="n">header</span><span class="o">.</span><span class="n">opcode</span><span class="p">,</span> <span class="n">body</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">decompressor</span><span class="p">,</span> <span class="n">result_metadata</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">exc</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s2">"Error decoding response from Cassandra. "</span>
<span class="s2">"</span><span class="si">%s</span><span class="s2">; buffer: </span><span class="si">%r</span><span class="s2">"</span><span class="p">,</span> <span class="n">header</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_iobuf</span><span class="o">.</span><span class="n">getvalue</span><span class="p">())</span>
<span class="k">if</span> <span class="n">callback</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">callback</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">exc</span><span class="p">)</span>
<span class="k">return</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">if</span> <span class="n">stream_id</span> <span class="o">>=</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="n">ProtocolException</span><span class="p">):</span>
<span class="k">if</span> <span class="s1">'unsupported protocol version'</span> <span class="ow">in</span> <span class="n">response</span><span class="o">.</span><span class="n">message</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">is_unsupported_proto_version</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">"Closing connection </span><span class="si">%s</span><span class="s2"> due to protocol error: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="p">,</span> <span class="n">response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">())</span>
<span class="bp">self</span><span class="o">.</span><span class="n">defunct</span><span class="p">(</span><span class="n">response</span><span class="p">)</span>
<span class="k">if</span> <span class="n">callback</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">callback</span><span class="p">(</span><span class="n">response</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">handle_pushed</span><span class="p">(</span><span class="n">response</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s2">"Callback handler errored, ignoring:"</span><span class="p">)</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_send_options_message</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">cql_version</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">and</span> <span class="p">(</span><span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">compression</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">locally_supported_compressions</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">"Not sending options message for new connection(</span><span class="si">%s</span><span class="s2">) to </span><span class="si">%s</span><span class="s2"> "</span>
<span class="s2">"because compression is disabled and a cql version was not "</span>
<span class="s2">"specified"</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">_compressor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span> <span class="o">=</span> <span class="n">DEFAULT_CQL_VERSION</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_send_startup_message</span><span class="p">(</span><span class="n">no_compact</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">no_compact</span><span class="p">)</span>
<span class="k">else</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">"Sending initial options message for new 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">send_msg</span><span class="p">(</span><span class="n">OptionsMessage</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_handle_options_response</span><span class="p">)</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_handle_options_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">options_response</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">options_response</span><span class="p">,</span> <span class="n">SupportedMessage</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">options_response</span><span class="p">,</span> <span class="n">ConnectionException</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">options_response</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">"Did not get expected SupportedMessage response; "</span>
<span class="s2">"instead, got: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">options_response</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">ConnectionException</span><span class="p">(</span><span class="s2">"Did not get expected SupportedMessage "</span>
<span class="s2">"response; instead, got: </span><span class="si">%s</span><span class="s2">"</span>
<span class="o">%</span> <span class="p">(</span><span class="n">options_response</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">"Received options response on new connection (</span><span class="si">%s</span><span class="s2">) from </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="n">supported_cql_versions</span> <span class="o">=</span> <span class="n">options_response</span><span class="o">.</span><span class="n">cql_versions</span>
<span class="n">remote_supported_compressions</span> <span class="o">=</span> <span class="n">options_response</span><span class="o">.</span><span class="n">options</span><span class="p">[</span><span class="s1">'COMPRESSION'</span><span class="p">]</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">supported_cql_versions</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span>
<span class="s2">"cql_version </span><span class="si">%r</span><span class="s2"> is not supported by remote (w/ native "</span>
<span class="s2">"protocol). Supported versions: </span><span class="si">%r</span><span class="s2">"</span>
<span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span><span class="p">,</span> <span class="n">supported_cql_versions</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span> <span class="o">=</span> <span class="n">supported_cql_versions</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_compressor</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">compression_type</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">compression</span><span class="p">:</span>
<span class="n">overlap</span> <span class="o">=</span> <span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">locally_supported_compressions</span><span class="o">.</span><span class="n">keys</span><span class="p">())</span> <span class="o">&</span>
<span class="nb">set</span><span class="p">(</span><span class="n">remote_supported_compressions</span><span class="p">))</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">overlap</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</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">"No available compression types supported on both ends."</span>
<span class="s2">" locally supported: </span><span class="si">%r</span><span class="s2">. remotely supported: </span><span class="si">%r</span><span class="s2">"</span><span class="p">,</span>
<span class="n">locally_supported_compressions</span><span class="o">.</span><span class="n">keys</span><span class="p">(),</span>
<span class="n">remote_supported_compressions</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">compression_type</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">compression</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
<span class="c1"># the user picked a specific compression type ('snappy' or 'lz4')</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">compression</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">remote_supported_compressions</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span>
<span class="s2">"The requested compression type (</span><span class="si">%s</span><span class="s2">) is not supported by the Cassandra server at </span><span class="si">%s</span><span class="s2">"</span>
<span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">compression</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="n">compression_type</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">compression</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># our locally supported compressions are ordered to prefer</span>
<span class="c1"># lz4, if available</span>
<span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">locally_supported_compressions</span><span class="o">.</span><span class="n">keys</span><span class="p">():</span>
<span class="k">if</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">overlap</span><span class="p">:</span>
<span class="n">compression_type</span> <span class="o">=</span> <span class="n">k</span>
<span class="k">break</span>
<span class="c1"># set the decompressor here, but set the compressor only after</span>
<span class="c1"># a successful Ready message</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_compressor</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">decompressor</span> <span class="o">=</span> \
<span class="n">locally_supported_compressions</span><span class="p">[</span><span class="n">compression_type</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_send_startup_message</span><span class="p">(</span><span class="n">compression_type</span><span class="p">,</span> <span class="n">no_compact</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">no_compact</span><span class="p">)</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_send_startup_message</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">compression</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">no_compact</span><span class="o">=</span><span class="kc">False</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">"Sending StartupMessage on </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span>
<span class="n">opts</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">if</span> <span class="n">compression</span><span class="p">:</span>
<span class="n">opts</span><span class="p">[</span><span class="s1">'COMPRESSION'</span><span class="p">]</span> <span class="o">=</span> <span class="n">compression</span>
<span class="k">if</span> <span class="n">no_compact</span><span class="p">:</span>
<span class="n">opts</span><span class="p">[</span><span class="s1">'NO_COMPACT'</span><span class="p">]</span> <span class="o">=</span> <span class="s1">'true'</span>
<span class="n">sm</span> <span class="o">=</span> <span class="n">StartupMessage</span><span class="p">(</span><span class="n">cqlversion</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">cql_version</span><span class="p">,</span> <span class="n">options</span><span class="o">=</span><span class="n">opts</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">sm</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="n">cb</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">_handle_startup_response</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">"Sent StartupMessage on </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_handle_startup_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">startup_response</span><span class="p">,</span> <span class="n">did_authenticate</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">startup_response</span><span class="p">,</span> <span class="n">ReadyMessage</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">"Got ReadyMessage on new connection (</span><span class="si">%s</span><span class="s2">) from </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="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_compressor</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">compressor</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_compressor</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">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">startup_response</span><span class="p">,</span> <span class="n">AuthenticateMessage</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">"Got AuthenticateMessage on new connection (</span><span class="si">%s</span><span class="s2">) from </span><span class="si">%s</span><span class="s2">: </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="n">startup_response</span><span class="o">.</span><span class="n">authenticator</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">AuthenticationFailed</span><span class="p">(</span><span class="s1">'Remote end requires authentication.'</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span><span class="p">,</span> <span class="nb">dict</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">"Sending credentials-based auth response on </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span>
<span class="n">cm</span> <span class="o">=</span> <span class="n">CredentialsMessage</span><span class="p">(</span><span class="n">creds</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span><span class="p">)</span>
<span class="n">callback</span> <span class="o">=</span> <span class="n">partial</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_handle_startup_response</span><span class="p">,</span> <span class="n">did_authenticate</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">cm</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="n">cb</span><span class="o">=</span><span class="n">callback</span><span class="p">)</span>
<span class="k">else</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">"Sending SASL-based auth response on </span><span class="si">%s</span><span class="s2">"</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">authenticator</span><span class="o">.</span><span class="n">server_authenticator_class</span> <span class="o">=</span> <span class="n">startup_response</span><span class="o">.</span><span class="n">authenticator</span>
<span class="n">initial_response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span><span class="o">.</span><span class="n">initial_response</span><span class="p">()</span>
<span class="n">initial_response</span> <span class="o">=</span> <span class="s2">""</span> <span class="k">if</span> <span class="n">initial_response</span> <span class="ow">is</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">initial_response</span>
<span class="bp">self</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">AuthResponseMessage</span><span class="p">(</span><span class="n">initial_response</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_handle_auth_response</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">startup_response</span><span class="p">,</span> <span class="n">ErrorMessage</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">"Received ErrorMessage on new connection (</span><span class="si">%s</span><span class="s2">) from </span><span class="si">%s</span><span class="s2">: </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="n">startup_response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">())</span>
<span class="k">if</span> <span class="n">did_authenticate</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">AuthenticationFailed</span><span class="p">(</span>
<span class="s2">"Failed to authenticate to </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</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="n">startup_response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">()))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ConnectionException</span><span class="p">(</span>
<span class="s2">"Failed to initialize new connection to </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">"</span>
<span class="o">%</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="n">startup_response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">()))</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">startup_response</span><span class="p">,</span> <span class="n">ConnectionShutdown</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">"Connection to </span><span class="si">%s</span><span class="s2"> was closed during the startup handshake"</span><span class="p">,</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">raise</span> <span class="n">startup_response</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s2">"Unexpected response during Connection setup: </span><span class="si">%r</span><span class="s2">"</span>
<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="n">startup_response</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span><span class="n">msg</span> <span class="o">%</span> <span class="p">(</span><span class="n">startup_response</span><span class="p">,))</span>
<span class="nd">@defunct_on_error</span>
<span class="k">def</span> <span class="nf">_handle_auth_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">auth_response</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">auth_response</span><span class="p">,</span> <span class="n">AuthSuccessMessage</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">"Connection </span><span class="si">%s</span><span class="s2"> successfully authenticated"</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">authenticator</span><span class="o">.</span><span class="n">on_authentication_success</span><span class="p">(</span><span class="n">auth_response</span><span class="o">.</span><span class="n">token</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_compressor</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">compressor</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_compressor</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">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">auth_response</span><span class="p">,</span> <span class="n">AuthChallengeMessage</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">authenticator</span><span class="o">.</span><span class="n">evaluate_challenge</span><span class="p">(</span><span class="n">auth_response</span><span class="o">.</span><span class="n">challenge</span><span class="p">)</span>
<span class="n">msg</span> <span class="o">=</span> <span class="n">AuthResponseMessage</span><span class="p">(</span><span class="s2">""</span> <span class="k">if</span> <span class="n">response</span> <span class="ow">is</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">response</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">"Responding to auth challenge on </span><span class="si">%s</span><span class="s2">"</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">send_msg</span><span class="p">(</span><span class="n">msg</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_handle_auth_response</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">auth_response</span><span class="p">,</span> <span class="n">ErrorMessage</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">"Received ErrorMessage on new connection (</span><span class="si">%s</span><span class="s2">) from </span><span class="si">%s</span><span class="s2">: </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="n">auth_response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">())</span>
<span class="k">raise</span> <span class="n">AuthenticationFailed</span><span class="p">(</span>
<span class="s2">"Failed to authenticate to </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</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="n">auth_response</span><span class="o">.</span><span class="n">summary_msg</span><span class="p">()))</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">auth_response</span><span class="p">,</span> <span class="n">ConnectionShutdown</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">"Connection to </span><span class="si">%s</span><span class="s2"> was closed during the authentication process"</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">raise</span> <span class="n">auth_response</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">msg</span> <span class="o">=</span> <span class="s2">"Unexpected response during Connection authentication to </span><span class="si">%s</span><span class="s2">: </span><span class="si">%r</span><span class="s2">"</span>
<span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">msg</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="n">auth_response</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">ProtocolError</span><span class="p">(</span><span class="n">msg</span> <span class="o">%</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="n">auth_response</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">set_keyspace_blocking</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">keyspace</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">keyspace</span> <span class="ow">or</span> <span class="n">keyspace</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">keyspace</span><span class="p">:</span>
<span class="k">return</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">QueryMessage</span><span class="p">(</span><span class="n">query</span><span class="o">=</span><span class="s1">'USE "</span><span class="si">%s</span><span class="s1">"'</span> <span class="o">%</span> <span class="p">(</span><span class="n">keyspace</span><span class="p">,),</span>
<span class="n">consistency_level</span><span class="o">=</span><span class="n">ConsistencyLevel</span><span class="o">.</span><span class="n">ONE</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">wait_for_response</span><span class="p">(</span><span class="n">query</span><span class="p">)</span>
<span class="k">except</span> <span class="n">InvalidRequestException</span> <span class="k">as</span> <span class="n">ire</span><span class="p">:</span>
<span class="c1"># the keyspace probably doesn't exist</span>
<span class="k">raise</span> <span class="n">ire</span><span class="o">.</span><span class="n">to_exception</span><span class="p">()</span>
<span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">exc</span><span class="p">:</span>
<span class="n">conn_exc</span> <span class="o">=</span> <span class="n">ConnectionException</span><span class="p">(</span>
<span class="s2">"Problem while setting keyspace: </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">exc</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">defunct</span><span class="p">(</span><span class="n">conn_exc</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">conn_exc</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ResultMessage</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">keyspace</span> <span class="o">=</span> <span class="n">keyspace</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">conn_exc</span> <span class="o">=</span> <span class="n">ConnectionException</span><span class="p">(</span>
<span class="s2">"Problem while setting keyspace: </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">result</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">defunct</span><span class="p">(</span><span class="n">conn_exc</span><span class="p">)</span>
<span class="k">raise</span> <span class="n">conn_exc</span>
<span class="k">def</span> <span class="nf">set_keyspace_async</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">keyspace</span><span class="p">,</span> <span class="n">callback</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Use this in order to avoid deadlocking the event loop thread.</span>
<span class="sd"> When the operation completes, `callback` will be called with</span>
<span class="sd"> two arguments: this connection and an Exception if an error</span>
<span class="sd"> occurred, otherwise :const:`None`.</span>
<span class="sd"> This method will always increment :attr:`.in_flight` attribute, even if</span>
<span class="sd"> it doesn't need to make a request, just to maintain an</span>
<span class="sd"> ":attr:`.in_flight` is incremented" invariant.</span>
<span class="sd"> """</span>
<span class="c1"># Here we increment in_flight unconditionally, whether we need to issue</span>
<span class="c1"># a request or not. This is bad, but allows callers -- specifically</span>
<span class="c1"># _set_keyspace_for_all_conns -- to assume that we increment</span>
<span class="c1"># self.in_flight during this call. This allows the passed callback to</span>
<span class="c1"># safely call HostConnection{Pool,}.return_connection on this</span>
<span class="c1"># Connection.</span>
<span class="c1">#</span>
<span class="c1"># We use a busy wait on the lock here because:</span>
<span class="c1"># - we'll only spin if the connection is at max capacity, which is very</span>
<span class="c1"># unlikely for a set_keyspace call</span>
<span class="c1"># - it allows us to avoid signaling a condition every time a request completes</span>
<span class="k">while</span> <span class="kc">True</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="bp">self</span><span class="o">.</span><span class="n">in_flight</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_request_id</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">in_flight</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">break</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mf">0.001</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">keyspace</span> <span class="ow">or</span> <span class="n">keyspace</span> <span class="o">==</span> <span class="bp">self</span><span class="o">.</span><span class="n">keyspace</span><span class="p">:</span>
<span class="n">callback</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">return</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">QueryMessage</span><span class="p">(</span><span class="n">query</span><span class="o">=</span><span class="s1">'USE "</span><span class="si">%s</span><span class="s1">"'</span> <span class="o">%</span> <span class="p">(</span><span class="n">keyspace</span><span class="p">,),</span>
<span class="n">consistency_level</span><span class="o">=</span><span class="n">ConsistencyLevel</span><span class="o">.</span><span class="n">ONE</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process_result</span><span class="p">(</span><span class="n">result</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ResultMessage</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">keyspace</span> <span class="o">=</span> <span class="n">keyspace</span>
<span class="n">callback</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">InvalidRequestException</span><span class="p">):</span>
<span class="n">callback</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">result</span><span class="o">.</span><span class="n">to_exception</span><span class="p">())</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">callback</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">defunct</span><span class="p">(</span><span class="n">ConnectionException</span><span class="p">(</span>
<span class="s2">"Problem while setting keyspace: </span><span class="si">%r</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">result</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="c1"># We've incremented self.in_flight above, so we "have permission" to</span>
<span class="c1"># acquire a new request id</span>
<span class="n">request_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">query</span><span class="p">,</span> <span class="n">request_id</span><span class="p">,</span> <span class="n">process_result</span><span class="p">)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">is_idle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">msg_received</span>
<span class="k">def</span> <span class="nf">reset_idle</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">msg_received</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">status</span> <span class="o">=</span> <span class="s2">""</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_defunct</span><span class="p">:</span>
<span class="n">status</span> <span class="o">=</span> <span class="s2">" (defunct)"</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">is_closed</span><span class="p">:</span>
<span class="n">status</span> <span class="o">=</span> <span class="s2">" (closed)"</span>
<span class="k">return</span> <span class="s2">"<</span><span class="si">%s</span><span class="s2">(</span><span class="si">%r</span><span class="s2">) </span><span class="si">%s</span><span class="s2">:</span><span class="si">%d%s</span><span class="s2">>"</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</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">port</span><span class="p">,</span> <span class="n">status</span><span class="p">)</span>
<span class="fm">__repr__</span> <span class="o">=</span> <span class="fm">__str__</span>
<span class="k">class</span> <span class="nc">ResponseWaiter</span><span class="p">(</span><span class="nb">object</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="n">num_responses</span><span class="p">,</span> <span class="n">fail_on_error</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="n">connection</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pending</span> <span class="o">=</span> <span class="n">num_responses</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fail_on_error</span> <span class="o">=</span> <span class="n">fail_on_error</span>
<span class="bp">self</span><span class="o">.</span><span class="n">error</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">responses</span> <span class="o">=</span> <span class="p">[</span><span class="kc">None</span><span class="p">]</span> <span class="o">*</span> <span class="n">num_responses</span>
<span class="bp">self</span><span class="o">.</span><span class="n">event</span> <span class="o">=</span> <span class="n">Event</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">got_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">response</span><span class="p">,</span> <span class="n">index</span><span class="p">):</span>
<span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">connection</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">connection</span><span class="o">.</span><span class="n">in_flight</span> <span class="o">-=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="ne">Exception</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">response</span><span class="p">,</span> <span class="s1">'to_exception'</span><span class="p">):</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">response</span><span class="o">.</span><span class="n">to_exception</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">fail_on_error</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">error</span> <span class="o">=</span> <span class="n">response</span>
<span class="bp">self</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">set</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">responses</span><span class="p">[</span><span class="n">index</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="kc">False</span><span class="p">,</span> <span class="n">response</span><span class="p">)</span>
<span class="k">else</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">fail_on_error</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">responses</span><span class="p">[</span><span class="n">index</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="kc">True</span><span class="p">,</span> <span class="n">response</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">responses</span><span class="p">[</span><span class="n">index</span><span class="p">]</span> <span class="o">=</span> <span class="n">response</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pending</span> <span class="o">-=</span> <span class="mi">1</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">pending</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">set</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">deliver</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="kc">None</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> If fail_on_error was set to False, a list of (success, response)</span>
<span class="sd"> tuples will be returned. If success is False, response will be</span>
<span class="sd"> an Exception. Otherwise, response will be the normal query response.</span>
<span class="sd"> If fail_on_error was left as True and one of the requests</span>
<span class="sd"> failed, the corresponding Exception will be raised. Otherwise,</span>
<span class="sd"> the normal response will be returned.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">wait</span><span class="p">(</span><span class="n">timeout</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">error</span><span class="p">:</span>
<span class="k">raise</span> <span class="bp">self</span><span class="o">.</span><span class="n">error</span>
<span class="k">elif</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">is_set</span><span class="p">():</span>
<span class="k">raise</span> <span class="n">OperationTimedOut</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">responses</span>
<span class="k">class</span> <span class="nc">HeartbeatFuture</span><span class="p">(</span><span class="nb">object</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="n">owner</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_exception</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_event</span> <span class="o">=</span> <span class="n">Event</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="n">connection</span>
<span class="bp">self</span><span class="o">.</span><span class="n">owner</span> <span class="o">=</span> <span class="n">owner</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Sending options message heartbeat on idle connection (</span><span class="si">%s</span><span class="s2">) </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="n">connection</span><span class="p">),</span> <span class="n">connection</span><span class="o">.</span><span class="n">host</span><span class="p">)</span>
<span class="k">with</span> <span class="n">connection</span><span class="o">.</span><span class="n">lock</span><span class="p">:</span>
<span class="k">if</span> <span class="n">connection</span><span class="o">.</span><span class="n">in_flight</span> <span class="o"><=</span> <span class="n">connection</span><span class="o">.</span><span class="n">max_request_id</span><span class="p">:</span>
<span class="n">connection</span><span class="o">.</span><span class="n">in_flight</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="n">connection</span><span class="o">.</span><span class="n">send_msg</span><span class="p">(</span><span class="n">OptionsMessage</span><span class="p">(),</span> <span class="n">connection</span><span class="o">.</span><span class="n">get_request_id</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_options_callback</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_exception</span> <span class="o">=</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">"Failed to send heartbeat because connection 'in_flight' exceeds threshold"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_event</span><span class="o">.</span><span class="n">set</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">wait</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">timeout</span><span class="p">):</span>