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<h1>Source code for airflow.utils.sqlalchemy</h1><div class="highlight"><pre>
<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1">#</span>
<span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span>
<span class="c1"># or more contributor license agreements. See the NOTICE file</span>
<span class="c1"># distributed with this work for additional information</span>
<span class="c1"># regarding copyright ownership. The ASF licenses this file</span>
<span class="c1"># to you under the Apache License, Version 2.0 (the</span>
<span class="c1"># &quot;License&quot;); you may not use this file except in compliance</span>
<span class="c1"># with the License. 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,</span>
<span class="c1"># software distributed under the License is distributed on an</span>
<span class="c1"># &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span>
<span class="c1"># KIND, either express or implied. See the License for the</span>
<span class="c1"># specific language governing permissions and limitations</span>
<span class="c1"># under the License.</span>
<span class="c1">#</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">division</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">print_function</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">unicode_literals</span>
<span class="kn">import</span> <span class="nn">datetime</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">json</span>
<span class="kn">import</span> <span class="nn">pendulum</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">random</span>
<span class="kn">from</span> <span class="nn">dateutil</span> <span class="k">import</span> <span class="n">relativedelta</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">event</span><span class="p">,</span> <span class="n">exc</span><span class="p">,</span> <span class="n">select</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.types</span> <span class="k">import</span> <span class="n">Text</span><span class="p">,</span> <span class="n">DateTime</span><span class="p">,</span> <span class="n">TypeDecorator</span>
<span class="kn">from</span> <span class="nn">airflow.utils.log.logging_mixin</span> <span class="k">import</span> <span class="n">LoggingMixin</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">LoggingMixin</span><span class="p">()</span><span class="o">.</span><span class="n">log</span>
<span class="n">utc</span> <span class="o">=</span> <span class="n">pendulum</span><span class="o">.</span><span class="n">timezone</span><span class="p">(</span><span class="s1">&#39;UTC&#39;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">setup_event_handlers</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span>
<span class="n">reconnect_timeout_seconds</span><span class="p">,</span>
<span class="n">initial_backoff_seconds</span><span class="o">=</span><span class="mf">0.2</span><span class="p">,</span>
<span class="n">max_backoff_seconds</span><span class="o">=</span><span class="mi">120</span><span class="p">):</span>
<span class="nd">@event</span><span class="o">.</span><span class="n">listens_for</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s2">&quot;engine_connect&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">ping_connection</span><span class="p">(</span><span class="n">connection</span><span class="p">,</span> <span class="n">branch</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Pessimistic SQLAlchemy disconnect handling. Ensures that each</span>
<span class="sd"> connection returned from the pool is properly connected to the database.</span>
<span class="sd"> http://docs.sqlalchemy.org/en/rel_1_1/core/pooling.html#disconnect-handling-pessimistic</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">branch</span><span class="p">:</span>
<span class="c1"># &quot;branch&quot; refers to a sub-connection of a connection,</span>
<span class="c1"># we don&#39;t want to bother pinging on these.</span>
<span class="k">return</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">backoff</span> <span class="o">=</span> <span class="n">initial_backoff_seconds</span>
<span class="c1"># turn off &quot;close with result&quot;. This flag is only used with</span>
<span class="c1"># &quot;connectionless&quot; execution, otherwise will be False in any case</span>
<span class="n">save_should_close_with_result</span> <span class="o">=</span> <span class="n">connection</span><span class="o">.</span><span class="n">should_close_with_result</span>
<span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="n">connection</span><span class="o">.</span><span class="n">should_close_with_result</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">connection</span><span class="o">.</span><span class="n">scalar</span><span class="p">(</span><span class="n">select</span><span class="p">([</span><span class="mi">1</span><span class="p">]))</span>
<span class="c1"># If we made it here then the connection appears to be healthy</span>
<span class="k">break</span>
<span class="k">except</span> <span class="n">exc</span><span class="o">.</span><span class="n">DBAPIError</span> <span class="k">as</span> <span class="n">err</span><span class="p">:</span>
<span class="k">if</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="o">&gt;=</span> <span class="n">reconnect_timeout_seconds</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">&quot;Failed to re-establish DB connection within </span><span class="si">%s</span><span class="s2"> secs: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span>
<span class="n">reconnect_timeout_seconds</span><span class="p">,</span>
<span class="n">err</span><span class="p">)</span>
<span class="k">raise</span>
<span class="k">if</span> <span class="n">err</span><span class="o">.</span><span class="n">connection_invalidated</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">&quot;DB connection invalidated. Reconnecting...&quot;</span><span class="p">)</span>
<span class="c1"># Use a truncated binary exponential backoff. Also includes</span>
<span class="c1"># a jitter to prevent the thundering herd problem of</span>
<span class="c1"># simultaneous client reconnects</span>
<span class="n">backoff</span> <span class="o">+=</span> <span class="n">backoff</span> <span class="o">*</span> <span class="n">random</span><span class="o">.</span><span class="n">random</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="nb">min</span><span class="p">(</span><span class="n">backoff</span><span class="p">,</span> <span class="n">max_backoff_seconds</span><span class="p">))</span>
<span class="c1"># run the same SELECT again - the connection will re-validate</span>
<span class="c1"># itself and establish a new connection. The disconnect detection</span>
<span class="c1"># here also causes the whole connection pool to be invalidated</span>
<span class="c1"># so that all stale connections are discarded.</span>
<span class="k">continue</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">&quot;Unknown database connection error. Not retrying: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span>
<span class="n">err</span><span class="p">)</span>
<span class="k">raise</span>
<span class="k">finally</span><span class="p">:</span>
<span class="c1"># restore &quot;close with result&quot;</span>
<span class="n">connection</span><span class="o">.</span><span class="n">should_close_with_result</span> <span class="o">=</span> <span class="n">save_should_close_with_result</span>
<span class="nd">@event</span><span class="o">.</span><span class="n">listens_for</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s2">&quot;connect&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">connect</span><span class="p">(</span><span class="n">dbapi_connection</span><span class="p">,</span> <span class="n">connection_record</span><span class="p">):</span>
<span class="n">connection_record</span><span class="o">.</span><span class="n">info</span><span class="p">[</span><span class="s1">&#39;pid&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">getpid</span><span class="p">()</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">dialect</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">&quot;sqlite&quot;</span><span class="p">:</span>
<span class="nd">@event</span><span class="o">.</span><span class="n">listens_for</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s2">&quot;connect&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">set_sqlite_pragma</span><span class="p">(</span><span class="n">dbapi_connection</span><span class="p">,</span> <span class="n">connection_record</span><span class="p">):</span>
<span class="n">cursor</span> <span class="o">=</span> <span class="n">dbapi_connection</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">&quot;PRAGMA foreign_keys=ON&quot;</span><span class="p">)</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="c1"># this ensures sanity in mysql when storing datetimes (not required for postgres)</span>
<span class="k">if</span> <span class="n">engine</span><span class="o">.</span><span class="n">dialect</span><span class="o">.</span><span class="n">name</span> <span class="o">==</span> <span class="s2">&quot;mysql&quot;</span><span class="p">:</span>
<span class="nd">@event</span><span class="o">.</span><span class="n">listens_for</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s2">&quot;connect&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">set_mysql_timezone</span><span class="p">(</span><span class="n">dbapi_connection</span><span class="p">,</span> <span class="n">connection_record</span><span class="p">):</span>
<span class="n">cursor</span> <span class="o">=</span> <span class="n">dbapi_connection</span><span class="o">.</span><span class="n">cursor</span><span class="p">()</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="s2">&quot;SET time_zone = &#39;+00:00&#39;&quot;</span><span class="p">)</span>
<span class="n">cursor</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="nd">@event</span><span class="o">.</span><span class="n">listens_for</span><span class="p">(</span><span class="n">engine</span><span class="p">,</span> <span class="s2">&quot;checkout&quot;</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">checkout</span><span class="p">(</span><span class="n">dbapi_connection</span><span class="p">,</span> <span class="n">connection_record</span><span class="p">,</span> <span class="n">connection_proxy</span><span class="p">):</span>
<span class="n">pid</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">getpid</span><span class="p">()</span>
<span class="k">if</span> <span class="n">connection_record</span><span class="o">.</span><span class="n">info</span><span class="p">[</span><span class="s1">&#39;pid&#39;</span><span class="p">]</span> <span class="o">!=</span> <span class="n">pid</span><span class="p">:</span>
<span class="n">connection_record</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="n">connection_proxy</span><span class="o">.</span><span class="n">connection</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">raise</span> <span class="n">exc</span><span class="o">.</span><span class="n">DisconnectionError</span><span class="p">(</span>
<span class="s2">&quot;Connection record belongs to pid </span><span class="si">{}</span><span class="s2">, &quot;</span>
<span class="s2">&quot;attempting to check out in pid </span><span class="si">{}</span><span class="s2">&quot;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">connection_record</span><span class="o">.</span><span class="n">info</span><span class="p">[</span><span class="s1">&#39;pid&#39;</span><span class="p">],</span> <span class="n">pid</span><span class="p">)</span>
<span class="p">)</span>
<div class="viewcode-block" id="UtcDateTime"><a class="viewcode-back" href="../../../_api/airflow/models/index.html#airflow.models.UtcDateTime">[docs]</a><span class="k">class</span> <span class="nc">UtcDateTime</span><span class="p">(</span><span class="n">TypeDecorator</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Almost equivalent to :class:`~sqlalchemy.types.DateTime` with</span>
<span class="sd"> ``timezone=True`` option, but it differs from that by:</span>
<span class="sd"> - Never silently take naive :class:`~datetime.datetime`, instead it</span>
<span class="sd"> always raise :exc:`ValueError` unless time zone aware value.</span>
<span class="sd"> - :class:`~datetime.datetime` value&#39;s :attr:`~datetime.datetime.tzinfo`</span>
<span class="sd"> is always converted to UTC.</span>
<span class="sd"> - Unlike SQLAlchemy&#39;s built-in :class:`~sqlalchemy.types.DateTime`,</span>
<span class="sd"> it never return naive :class:`~datetime.datetime`, but time zone</span>
<span class="sd"> aware value, even with SQLite or MySQL.</span>
<span class="sd"> - Always returns DateTime in UTC</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">impl</span> <span class="o">=</span> <span class="n">DateTime</span><span class="p">(</span><span class="n">timezone</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process_bind_param</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">datetime</span><span class="o">.</span><span class="n">datetime</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s1">&#39;expected datetime.datetime, not &#39;</span> <span class="o">+</span>
<span class="nb">repr</span><span class="p">(</span><span class="n">value</span><span class="p">))</span>
<span class="k">elif</span> <span class="n">value</span><span class="o">.</span><span class="n">tzinfo</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;naive datetime is disallowed&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">value</span><span class="o">.</span><span class="n">astimezone</span><span class="p">(</span><span class="n">utc</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process_result_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Processes DateTimes from the DB making sure it is always</span>
<span class="sd"> returning UTC. Not using timezone.convert_to_utc as that</span>
<span class="sd"> converts to configured TIMEZONE while the DB might be</span>
<span class="sd"> running with some other setting. We assume UTC datetimes</span>
<span class="sd"> in the database.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="n">value</span><span class="o">.</span><span class="n">tzinfo</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">value</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">tzinfo</span><span class="o">=</span><span class="n">utc</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">value</span><span class="o">.</span><span class="n">astimezone</span><span class="p">(</span><span class="n">utc</span><span class="p">)</span>
<span class="k">return</span> <span class="n">value</span></div>
<div class="viewcode-block" id="Interval"><a class="viewcode-back" href="../../../_api/airflow/models/index.html#airflow.models.Interval">[docs]</a><span class="k">class</span> <span class="nc">Interval</span><span class="p">(</span><span class="n">TypeDecorator</span><span class="p">):</span>
<span class="n">impl</span> <span class="o">=</span> <span class="n">Text</span>
<span class="n">attr_keys</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">datetime</span><span class="o">.</span><span class="n">timedelta</span><span class="p">:</span> <span class="p">(</span><span class="s1">&#39;days&#39;</span><span class="p">,</span> <span class="s1">&#39;seconds&#39;</span><span class="p">,</span> <span class="s1">&#39;microseconds&#39;</span><span class="p">),</span>
<span class="n">relativedelta</span><span class="o">.</span><span class="n">relativedelta</span><span class="p">:</span> <span class="p">(</span>
<span class="s1">&#39;years&#39;</span><span class="p">,</span> <span class="s1">&#39;months&#39;</span><span class="p">,</span> <span class="s1">&#39;days&#39;</span><span class="p">,</span> <span class="s1">&#39;leapdays&#39;</span><span class="p">,</span> <span class="s1">&#39;hours&#39;</span><span class="p">,</span> <span class="s1">&#39;minutes&#39;</span><span class="p">,</span> <span class="s1">&#39;seconds&#39;</span><span class="p">,</span> <span class="s1">&#39;microseconds&#39;</span><span class="p">,</span>
<span class="s1">&#39;year&#39;</span><span class="p">,</span> <span class="s1">&#39;month&#39;</span><span class="p">,</span> <span class="s1">&#39;day&#39;</span><span class="p">,</span> <span class="s1">&#39;hour&#39;</span><span class="p">,</span> <span class="s1">&#39;minute&#39;</span><span class="p">,</span> <span class="s1">&#39;second&#39;</span><span class="p">,</span> <span class="s1">&#39;microsecond&#39;</span><span class="p">,</span>
<span class="p">),</span>
<span class="p">}</span>
<span class="k">def</span> <span class="nf">process_bind_param</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">attr_keys</span><span class="p">:</span>
<span class="n">attrs</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">key</span><span class="p">:</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">key</span><span class="p">)</span>
<span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">attr_keys</span><span class="p">[</span><span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)]</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">({</span><span class="s1">&#39;type&#39;</span><span class="p">:</span> <span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> <span class="s1">&#39;attrs&#39;</span><span class="p">:</span> <span class="n">attrs</span><span class="p">})</span>
<span class="k">return</span> <span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">process_result_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">,</span> <span class="n">dialect</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">value</span><span class="p">:</span>
<span class="k">return</span> <span class="n">value</span>
<span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
<span class="n">type_map</span> <span class="o">=</span> <span class="p">{</span><span class="n">key</span><span class="o">.</span><span class="vm">__name__</span><span class="p">:</span> <span class="n">key</span> <span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">attr_keys</span><span class="p">}</span>
<span class="k">return</span> <span class="n">type_map</span><span class="p">[</span><span class="n">data</span><span class="p">[</span><span class="s1">&#39;type&#39;</span><span class="p">]](</span><span class="o">**</span><span class="n">data</span><span class="p">[</span><span class="s1">&#39;attrs&#39;</span><span class="p">])</span>
<span class="k">return</span> <span class="n">data</span></div>
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