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| <h1>Source code for airflow.hooks.postgres_hook</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"># "License"); 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"># "AS IS" 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="kn">import</span> <span class="nn">os</span> |
| <span class="kn">import</span> <span class="nn">psycopg2</span> |
| <span class="kn">import</span> <span class="nn">psycopg2.extensions</span> |
| <span class="kn">from</span> <span class="nn">contextlib</span> <span class="k">import</span> <span class="n">closing</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.hooks.dbapi_hook</span> <span class="k">import</span> <span class="n">DbApiHook</span> |
| |
| |
| <div class="viewcode-block" id="PostgresHook"><a class="viewcode-back" href="../../../code.html#airflow.hooks.postgres_hook.PostgresHook">[docs]</a><span class="k">class</span> <span class="nc">PostgresHook</span><span class="p">(</span><span class="n">DbApiHook</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Interact with Postgres.</span> |
| <span class="sd"> You can specify ssl parameters in the extra field of your connection</span> |
| <span class="sd"> as ``{"sslmode": "require", "sslcert": "/path/to/cert.pem", etc}``.</span> |
| |
| <span class="sd"> Note: For Redshift, use keepalives_idle in the extra connection parameters</span> |
| <span class="sd"> and set it to less than 300 seconds.</span> |
| <span class="sd"> """</span> |
| <span class="n">conn_name_attr</span> <span class="o">=</span> <span class="s1">'postgres_conn_id'</span> |
| <span class="n">default_conn_name</span> <span class="o">=</span> <span class="s1">'postgres_default'</span> |
| <span class="n">supports_autocommit</span> <span class="o">=</span> <span class="kc">True</span> |
| |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">(</span><span class="n">PostgresHook</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="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">schema</span> <span class="o">=</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="s2">"schema"</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| |
| <div class="viewcode-block" id="PostgresHook.get_conn"><a class="viewcode-back" href="../../../code.html#airflow.hooks.postgres_hook.PostgresHook.get_conn">[docs]</a> <span class="k">def</span> <span class="nf">get_conn</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="n">conn</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_connection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">postgres_conn_id</span><span class="p">)</span> |
| <span class="n">conn_args</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span> |
| <span class="n">host</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">host</span><span class="p">,</span> |
| <span class="n">user</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">login</span><span class="p">,</span> |
| <span class="n">password</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">password</span><span class="p">,</span> |
| <span class="n">dbname</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">schema</span> <span class="ow">or</span> <span class="n">conn</span><span class="o">.</span><span class="n">schema</span><span class="p">,</span> |
| <span class="n">port</span><span class="o">=</span><span class="n">conn</span><span class="o">.</span><span class="n">port</span><span class="p">)</span> |
| <span class="c1"># check for ssl parameters in conn.extra</span> |
| <span class="k">for</span> <span class="n">arg_name</span><span class="p">,</span> <span class="n">arg_val</span> <span class="ow">in</span> <span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">arg_name</span> <span class="ow">in</span> <span class="p">[</span><span class="s1">'sslmode'</span><span class="p">,</span> <span class="s1">'sslcert'</span><span class="p">,</span> <span class="s1">'sslkey'</span><span class="p">,</span> |
| <span class="s1">'sslrootcert'</span><span class="p">,</span> <span class="s1">'sslcrl'</span><span class="p">,</span> <span class="s1">'application_name'</span><span class="p">,</span> |
| <span class="s1">'keepalives_idle'</span><span class="p">]:</span> |
| <span class="n">conn_args</span><span class="p">[</span><span class="n">arg_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">arg_val</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">conn</span> <span class="o">=</span> <span class="n">psycopg2</span><span class="o">.</span><span class="n">connect</span><span class="p">(</span><span class="o">**</span><span class="n">conn_args</span><span class="p">)</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">conn</span></div> |
| |
| <div class="viewcode-block" id="PostgresHook.copy_expert"><a class="viewcode-back" href="../../../code.html#airflow.hooks.postgres_hook.PostgresHook.copy_expert">[docs]</a> <span class="k">def</span> <span class="nf">copy_expert</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sql</span><span class="p">,</span> <span class="n">filename</span><span class="p">,</span> <span class="nb">open</span><span class="o">=</span><span class="nb">open</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Executes SQL using psycopg2 copy_expert method.</span> |
| <span class="sd"> Necessary to execute COPY command without access to a superuser.</span> |
| |
| <span class="sd"> Note: if this method is called with a "COPY FROM" statement and</span> |
| <span class="sd"> the specified input file does not exist, it creates an empty</span> |
| <span class="sd"> file and no data is loaded, but the operation succeeds.</span> |
| <span class="sd"> So if users want to be aware when the input file does not exist,</span> |
| <span class="sd"> they have to check its existence by themselves.</span> |
| <span class="sd"> """</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">filename</span><span class="p">):</span> |
| <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">'w'</span><span class="p">):</span> |
| <span class="k">pass</span> |
| |
| <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">filename</span><span class="p">,</span> <span class="s1">'r+'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span> |
| <span class="k">with</span> <span class="n">closing</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">())</span> <span class="k">as</span> <span class="n">conn</span><span class="p">:</span> |
| <span class="k">with</span> <span class="n">closing</span><span class="p">(</span><span class="n">conn</span><span class="o">.</span><span class="n">cursor</span><span class="p">())</span> <span class="k">as</span> <span class="n">cur</span><span class="p">:</span> |
| <span class="n">cur</span><span class="o">.</span><span class="n">copy_expert</span><span class="p">(</span><span class="n">sql</span><span class="p">,</span> <span class="n">f</span><span class="p">)</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">truncate</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">tell</span><span class="p">())</span> |
| <span class="n">conn</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span></div> |
| |
| <div class="viewcode-block" id="PostgresHook.bulk_load"><a class="viewcode-back" href="../../../code.html#airflow.hooks.postgres_hook.PostgresHook.bulk_load">[docs]</a> <span class="k">def</span> <span class="nf">bulk_load</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">tmp_file</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Loads a tab-delimited file into a database table</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">copy_expert</span><span class="p">(</span><span class="s2">"COPY </span><span class="si">{table}</span><span class="s2"> FROM STDIN"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">table</span><span class="o">=</span><span class="n">table</span><span class="p">),</span> <span class="n">tmp_file</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="PostgresHook.bulk_dump"><a class="viewcode-back" href="../../../code.html#airflow.hooks.postgres_hook.PostgresHook.bulk_dump">[docs]</a> <span class="k">def</span> <span class="nf">bulk_dump</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">table</span><span class="p">,</span> <span class="n">tmp_file</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Dumps a database table into a tab-delimited file</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">copy_expert</span><span class="p">(</span><span class="s2">"COPY </span><span class="si">{table}</span><span class="s2"> TO STDOUT"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">table</span><span class="o">=</span><span class="n">table</span><span class="p">),</span> <span class="n">tmp_file</span><span class="p">)</span></div> |
| |
| <span class="nd">@staticmethod</span> |
| <span class="k">def</span> <span class="nf">_serialize_cell</span><span class="p">(</span><span class="n">cell</span><span class="p">,</span> <span class="n">conn</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Postgresql will adapt all arguments to the execute() method internally,</span> |
| <span class="sd"> hence we return cell without any conversion.</span> |
| |
| <span class="sd"> See http://initd.org/psycopg/docs/advanced.html#adapting-new-types for</span> |
| <span class="sd"> more information.</span> |
| |
| <span class="sd"> :param cell: The cell to insert into the table</span> |
| <span class="sd"> :type cell: object</span> |
| <span class="sd"> :param conn: The database connection</span> |
| <span class="sd"> :type conn: connection object</span> |
| <span class="sd"> :return: The cell</span> |
| <span class="sd"> :rtype: object</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="n">cell</span></div> |
| </pre></div> |
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