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<h1>Source code for airflow.models.serialized_dag</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="sd">&quot;&quot;&quot;Serialzed DAG table in database.&quot;&quot;&quot;</span>
<span class="kn">import</span> <span class="nn">hashlib</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">timedelta</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="k">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Optional</span>
<span class="kn">import</span> <span class="nn">sqlalchemy_jsonfield</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">Column</span><span class="p">,</span> <span class="n">Index</span><span class="p">,</span> <span class="n">Integer</span><span class="p">,</span> <span class="n">String</span><span class="p">,</span> <span class="n">and_</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.sql</span> <span class="k">import</span> <span class="n">exists</span>
<span class="kn">from</span> <span class="nn">airflow</span> <span class="k">import</span> <span class="n">DAG</span>
<span class="kn">from</span> <span class="nn">airflow.models.base</span> <span class="k">import</span> <span class="n">ID_LEN</span><span class="p">,</span> <span class="n">Base</span>
<span class="kn">from</span> <span class="nn">airflow.serialization.serialized_objects</span> <span class="k">import</span> <span class="n">SerializedDAG</span>
<span class="kn">from</span> <span class="nn">airflow.settings</span> <span class="k">import</span> <span class="n">json</span>
<span class="kn">from</span> <span class="nn">airflow.utils</span> <span class="k">import</span> <span class="n">db</span><span class="p">,</span> <span class="n">timezone</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="kn">from</span> <span class="nn">airflow.utils.sqlalchemy</span> <span class="k">import</span> <span class="n">UtcDateTime</span>
<div class="viewcode-block" id="log"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.log">[docs]</a><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></div>
<div class="viewcode-block" id="SerializedDagModel"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel">[docs]</a><span class="k">class</span> <span class="nc">SerializedDagModel</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A table for serialized DAGs.</span>
<span class="sd"> serialized_dag table is a snapshot of DAG files synchronized by scheduler.</span>
<span class="sd"> This feature is controlled by:</span>
<span class="sd"> * ``[core] store_serialized_dags = True``: enable this feature</span>
<span class="sd"> * ``[core] min_serialized_dag_update_interval = 30`` (s):</span>
<span class="sd"> serialized DAGs are updated in DB when a file gets processed by scheduler,</span>
<span class="sd"> to reduce DB write rate, there is a minimal interval of updating serialized DAGs.</span>
<span class="sd"> * ``[scheduler] dag_dir_list_interval = 300`` (s):</span>
<span class="sd"> interval of deleting serialized DAGs in DB when the files are deleted, suggest</span>
<span class="sd"> to use a smaller interval such as 60</span>
<span class="sd"> It is used by webserver to load dagbags when ``store_serialized_dags=True``.</span>
<span class="sd"> Because reading from database is lightweight compared to importing from files,</span>
<span class="sd"> it solves the webserver scalability issue.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<div class="viewcode-block" id="SerializedDagModel.__tablename__"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.__tablename__">[docs]</a> <span class="n">__tablename__</span> <span class="o">=</span> <span class="s1">&#39;serialized_dag&#39;</span></div>
<div class="viewcode-block" id="SerializedDagModel.dag_id"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.dag_id">[docs]</a> <span class="n">dag_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="n">ID_LEN</span><span class="p">),</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span></div>
<div class="viewcode-block" id="SerializedDagModel.fileloc"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.fileloc">[docs]</a> <span class="n">fileloc</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">2000</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<span class="c1"># The max length of fileloc exceeds the limit of indexing.</span>
<div class="viewcode-block" id="SerializedDagModel.fileloc_hash"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.fileloc_hash">[docs]</a> <span class="n">fileloc_hash</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<div class="viewcode-block" id="SerializedDagModel.data"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.data">[docs]</a> <span class="n">data</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">sqlalchemy_jsonfield</span><span class="o">.</span><span class="n">JSONField</span><span class="p">(</span><span class="n">json</span><span class="o">=</span><span class="n">json</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<div class="viewcode-block" id="SerializedDagModel.last_updated"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.last_updated">[docs]</a> <span class="n">last_updated</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">UtcDateTime</span><span class="p">,</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span></div>
<div class="viewcode-block" id="SerializedDagModel.__table_args__"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.__table_args__">[docs]</a> <span class="n">__table_args__</span> <span class="o">=</span> <span class="p">(</span>
<span class="n">Index</span><span class="p">(</span><span class="s1">&#39;idx_fileloc_hash&#39;</span><span class="p">,</span> <span class="n">fileloc_hash</span><span class="p">,</span> <span class="n">unique</span><span class="o">=</span><span class="kc">False</span><span class="p">),</span></div>
<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">dag</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">=</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fileloc</span> <span class="o">=</span> <span class="n">dag</span><span class="o">.</span><span class="n">full_filepath</span>
<span class="bp">self</span><span class="o">.</span><span class="n">fileloc_hash</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">dag_fileloc_hash</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">fileloc</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="n">SerializedDAG</span><span class="o">.</span><span class="n">to_dict</span><span class="p">(</span><span class="n">dag</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">last_updated</span> <span class="o">=</span> <span class="n">timezone</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span>
<span class="nd">@staticmethod</span>
<div class="viewcode-block" id="SerializedDagModel.dag_fileloc_hash"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.dag_fileloc_hash">[docs]</a> <span class="k">def</span> <span class="nf">dag_fileloc_hash</span><span class="p">(</span><span class="n">full_filepath</span><span class="p">):</span>
<span class="c1"># type: (str) -&gt; int</span>
<span class="sd">&quot;&quot;&quot;&quot;Hashing file location for indexing.</span>
<span class="sd"> :param full_filepath: full filepath of DAG file</span>
<span class="sd"> :return: hashed full_filepath</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># hashing is needed because the length of fileloc is 2000 as an Airflow convention,</span>
<span class="c1"># which is over the limit of indexing. If we can reduce the length of fileloc, then</span>
<span class="c1"># hashing is not needed.</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="mh">0xFFFF</span> <span class="o">&amp;</span> <span class="nb">int</span><span class="p">(</span>
<span class="n">hashlib</span><span class="o">.</span><span class="n">sha1</span><span class="p">(</span><span class="n">full_filepath</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">&#39;utf-8&#39;</span><span class="p">))</span><span class="o">.</span><span class="n">hexdigest</span><span class="p">(),</span> <span class="mi">16</span><span class="p">))</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.write_dag"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.write_dag">[docs]</a> <span class="k">def</span> <span class="nf">write_dag</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span>
<span class="n">dag</span><span class="p">,</span> <span class="c1"># type: DAG</span>
<span class="n">min_update_interval</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="c1"># type: Optional[int]</span>
<span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Serializes a DAG and writes it into database.</span>
<span class="sd"> :param dag: a DAG to be written into database</span>
<span class="sd"> :param min_update_interval: minimal interval in seconds to update serialized DAG</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;Writing DAG: </span><span class="si">%s</span><span class="s2"> to the DB&quot;</span><span class="p">,</span> <span class="n">dag</span><span class="p">)</span>
<span class="c1"># Checks if (Current Time - Time when the DAG was written to DB) &lt; min_update_interval</span>
<span class="c1"># If Yes, does nothing</span>
<span class="c1"># If No or the DAG does not exists, updates / writes Serialized DAG to DB</span>
<span class="k">if</span> <span class="n">min_update_interval</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">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">exists</span><span class="p">()</span><span class="o">.</span><span class="n">where</span><span class="p">(</span>
<span class="n">and_</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span><span class="p">,</span>
<span class="p">(</span><span class="n">timezone</span><span class="o">.</span><span class="n">utcnow</span><span class="p">()</span> <span class="o">-</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">seconds</span><span class="o">=</span><span class="n">min_update_interval</span><span class="p">))</span> <span class="o">&lt;</span> <span class="bp">cls</span><span class="o">.</span><span class="n">last_updated</span><span class="p">))</span>
<span class="p">)</span><span class="o">.</span><span class="n">scalar</span><span class="p">():</span>
<span class="k">return</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;Writing DAG: </span><span class="si">%s</span><span class="s2"> to the DB&quot;</span><span class="p">,</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span><span class="p">)</span>
<span class="n">session</span><span class="o">.</span><span class="n">merge</span><span class="p">(</span><span class="bp">cls</span><span class="p">(</span><span class="n">dag</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">&quot;DAG: </span><span class="si">%s</span><span class="s2"> written to the DB&quot;</span><span class="p">,</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span><span class="p">)</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.read_all_dags"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.read_all_dags">[docs]</a> <span class="k">def</span> <span class="nf">read_all_dags</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Reads all DAGs in serialized_dag table.</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> :returns: a dict of DAGs read from database</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">serialized_dags</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span>
<span class="n">dags</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">row</span> <span class="ow">in</span> <span class="n">serialized_dags</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">&quot;Deserializing DAG: </span><span class="si">%s</span><span class="s2">&quot;</span><span class="p">,</span> <span class="n">row</span><span class="o">.</span><span class="n">dag_id</span><span class="p">)</span>
<span class="n">dag</span> <span class="o">=</span> <span class="n">row</span><span class="o">.</span><span class="n">dag</span>
<span class="c1"># Sanity check.</span>
<span class="k">if</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">row</span><span class="o">.</span><span class="n">dag_id</span><span class="p">:</span>
<span class="n">dags</span><span class="p">[</span><span class="n">row</span><span class="o">.</span><span class="n">dag_id</span><span class="p">]</span> <span class="o">=</span> <span class="n">dag</span>
<span class="k">else</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;dag_id Mismatch in DB: Row with dag_id &#39;</span><span class="si">%s</span><span class="s2">&#39; has Serialised DAG &quot;</span>
<span class="s2">&quot;with &#39;</span><span class="si">%s</span><span class="s2">&#39; dag_id&quot;</span><span class="p">,</span> <span class="n">row</span><span class="o">.</span><span class="n">dag_id</span><span class="p">,</span> <span class="n">dag</span><span class="o">.</span><span class="n">dag_id</span><span class="p">)</span>
<span class="k">return</span> <span class="n">dags</span></div>
<span class="nd">@property</span>
<div class="viewcode-block" id="SerializedDagModel.dag"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.dag">[docs]</a> <span class="k">def</span> <span class="nf">dag</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;The DAG deserialized from the ``data`` column&quot;&quot;&quot;</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">data</span><span class="p">,</span> <span class="nb">dict</span><span class="p">):</span>
<span class="n">dag</span> <span class="o">=</span> <span class="n">SerializedDAG</span><span class="o">.</span><span class="n">from_dict</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">data</span><span class="p">)</span> <span class="c1"># type: Any</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># noinspection PyTypeChecker</span>
<span class="n">dag</span> <span class="o">=</span> <span class="n">SerializedDAG</span><span class="o">.</span><span class="n">from_json</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">data</span><span class="p">)</span>
<span class="k">return</span> <span class="n">dag</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.remove_dag"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.remove_dag">[docs]</a> <span class="k">def</span> <span class="nf">remove_dag</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">dag_id</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Deletes a DAG with given dag_id.</span>
<span class="sd"> :param dag_id: dag_id to be deleted</span>
<span class="sd"> :type dag_id: str</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">session</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">__table__</span><span class="o">.</span><span class="n">delete</span><span class="p">()</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">dag_id</span><span class="p">))</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.remove_deleted_dags"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.remove_deleted_dags">[docs]</a> <span class="k">def</span> <span class="nf">remove_deleted_dags</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">alive_dag_filelocs</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Deletes DAGs not included in alive_dag_filelocs.</span>
<span class="sd"> :param alive_dag_filelocs: file paths of alive DAGs</span>
<span class="sd"> :type alive_dag_filelocs: list</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">alive_fileloc_hashes</span> <span class="o">=</span> <span class="p">[</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">dag_fileloc_hash</span><span class="p">(</span><span class="n">fileloc</span><span class="p">)</span> <span class="k">for</span> <span class="n">fileloc</span> <span class="ow">in</span> <span class="n">alive_dag_filelocs</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">&quot;Deleting Serialized DAGs (for which DAG files are deleted) &quot;</span>
<span class="s2">&quot;from </span><span class="si">%s</span><span class="s2"> table &quot;</span><span class="p">,</span> <span class="bp">cls</span><span class="o">.</span><span class="n">__tablename__</span><span class="p">)</span>
<span class="n">session</span><span class="o">.</span><span class="n">execute</span><span class="p">(</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">__table__</span><span class="o">.</span><span class="n">delete</span><span class="p">()</span><span class="o">.</span><span class="n">where</span><span class="p">(</span>
<span class="n">and_</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">fileloc_hash</span><span class="o">.</span><span class="n">notin_</span><span class="p">(</span><span class="n">alive_fileloc_hashes</span><span class="p">),</span>
<span class="bp">cls</span><span class="o">.</span><span class="n">fileloc</span><span class="o">.</span><span class="n">notin_</span><span class="p">(</span><span class="n">alive_dag_filelocs</span><span class="p">))))</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.has_dag"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.has_dag">[docs]</a> <span class="k">def</span> <span class="nf">has_dag</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">dag_id</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Checks a DAG exist in serialized_dag table.</span>
<span class="sd"> :param dag_id: the DAG to check</span>
<span class="sd"> :type dag_id: str</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> :rtype: bool</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">return</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">exists</span><span class="p">()</span><span class="o">.</span><span class="n">where</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">dag_id</span><span class="p">))</span><span class="o">.</span><span class="n">scalar</span><span class="p">()</span></div>
<span class="nd">@classmethod</span>
<span class="nd">@db</span><span class="o">.</span><span class="n">provide_session</span>
<div class="viewcode-block" id="SerializedDagModel.get"><a class="viewcode-back" href="../../../_api/airflow/models/serialized_dag/index.html#airflow.models.serialized_dag.SerializedDagModel.get">[docs]</a> <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">dag_id</span><span class="p">,</span> <span class="n">session</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Get the SerializedDAG for the given dag ID.</span>
<span class="sd"> It will cope with being passed the ID of a subdag by looking up the</span>
<span class="sd"> root dag_id from the DAG table.</span>
<span class="sd"> :param dag_id: the DAG to fetch</span>
<span class="sd"> :param session: ORM Session</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">airflow.models.dag</span> <span class="k">import</span> <span class="n">DagModel</span>
<span class="n">row</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">dag_id</span><span class="p">)</span><span class="o">.</span><span class="n">one_or_none</span><span class="p">()</span>
<span class="k">if</span> <span class="n">row</span><span class="p">:</span>
<span class="k">return</span> <span class="n">row</span>
<span class="c1"># If we didn&#39;t find a matching DAG id then ask the DAG table to find</span>
<span class="c1"># out the root dag</span>
<span class="n">root_dag_id</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span>
<span class="n">DagModel</span><span class="o">.</span><span class="n">root_dag_id</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">DagModel</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">dag_id</span><span class="p">)</span><span class="o">.</span><span class="n">scalar</span><span class="p">()</span>
<span class="k">return</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="bp">cls</span><span class="o">.</span><span class="n">dag_id</span> <span class="o">==</span> <span class="n">root_dag_id</span><span class="p">)</span><span class="o">.</span><span class="n">one_or_none</span><span class="p">()</span></div></div>
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