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| <h1>Source code for apache_beam.io.debezium</h1><div class="highlight"><pre> |
| <span></span><span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span> |
| <span class="c1"># contributor license agreements. See the NOTICE file distributed with</span> |
| <span class="c1"># this work for additional information regarding copyright ownership.</span> |
| <span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span> |
| <span class="c1"># (the "License"); you may not use this file except in compliance with</span> |
| <span class="c1"># 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, 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="c1">#</span> |
| |
| <span class="sd">""" Unbounded source transform for</span> |
| <span class="sd"> `Debezium <href="https://debezium.io/"/>`_.</span> |
| |
| <span class="sd"> This transform is currently supported by Beam portable</span> |
| <span class="sd"> Flink, Spark, and Dataflow v2 runners.</span> |
| |
| <span class="sd"> **Setup**</span> |
| |
| <span class="sd"> Transform provided in this module is cross-language transform</span> |
| <span class="sd"> implemented in the Beam Java SDK. During the pipeline construction, Python SDK</span> |
| <span class="sd"> will connect to a Java expansion service to expand this transform.</span> |
| <span class="sd"> To facilitate this, a small amount of setup is needed before using this</span> |
| <span class="sd"> transform in a Beam Python pipeline.</span> |
| |
| <span class="sd"> There are several ways to setup cross-language Debezium transform.</span> |
| |
| <span class="sd"> * Option 1: use the default expansion service</span> |
| <span class="sd"> * Option 2: specify a custom expansion service</span> |
| |
| <span class="sd"> See below for details regarding each of these options.</span> |
| |
| <span class="sd"> *Option 1: Use the default expansion service*</span> |
| |
| <span class="sd"> This is the recommended and easiest setup option for using Python Debezium</span> |
| <span class="sd"> transform. This option requires following pre-requisites</span> |
| <span class="sd"> before running the Beam pipeline.</span> |
| |
| <span class="sd"> * Install Java runtime in the computer from where the pipeline is constructed</span> |
| <span class="sd"> and make sure that 'java' command is available.</span> |
| |
| <span class="sd"> In this option, Python SDK will either download (for released Beam version) or</span> |
| <span class="sd"> build (when running from a Beam Git clone) a expansion service jar and use</span> |
| <span class="sd"> that to expand transforms. Currently Debezium transform use the</span> |
| <span class="sd"> 'beam-sdks-java-io-debezium-expansion-service' jar for this purpose.</span> |
| |
| <span class="sd"> *Option 2: specify a custom expansion service*</span> |
| |
| <span class="sd"> In this option, you startup your own expansion service and provide that as</span> |
| <span class="sd"> a parameter when using the transform provided in this module.</span> |
| |
| <span class="sd"> This option requires following pre-requisites before running the Beam</span> |
| <span class="sd"> pipeline.</span> |
| |
| <span class="sd"> * Startup your own expansion service.</span> |
| <span class="sd"> * Update your pipeline to provide the expansion service address when</span> |
| <span class="sd"> initiating Debezium transform provided in this module.</span> |
| |
| <span class="sd"> Flink Users can use the built-in Expansion Service of the Flink Runner's</span> |
| <span class="sd"> Job Server. If you start Flink's Job Server, the expansion service will be</span> |
| <span class="sd"> started on port 8097. For a different address, please set the</span> |
| <span class="sd"> expansion_service parameter.</span> |
| |
| <span class="sd"> **More information**</span> |
| |
| <span class="sd"> For more information regarding cross-language transforms see:</span> |
| <span class="sd"> - https://beam.apache.org/roadmap/portability/</span> |
| |
| <span class="sd"> For more information specific to Flink runner see:</span> |
| <span class="sd"> - https://beam.apache.org/documentation/runners/flink/</span> |
| <span class="sd">"""</span> |
| |
| <span class="c1"># pytype: skip-file</span> |
| |
| <span class="kn">import</span> <span class="nn">json</span> |
| <span class="kn">from</span> <span class="nn">enum</span> <span class="kn">import</span> <span class="n">Enum</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">List</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">NamedTuple</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Optional</span> |
| |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">DoFn</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">ParDo</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">PTransform</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms.external</span> <span class="kn">import</span> <span class="n">BeamJarExpansionService</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms.external</span> <span class="kn">import</span> <span class="n">ExternalTransform</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.transforms.external</span> <span class="kn">import</span> <span class="n">NamedTupleBasedPayloadBuilder</span> |
| |
| <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s1">'ReadFromDebezium'</span><span class="p">,</span> <span class="s1">'DriverClassName'</span><span class="p">]</span> |
| |
| |
| <span class="k">def</span> <span class="nf">default_io_expansion_service</span><span class="p">():</span> |
| <span class="k">return</span> <span class="n">BeamJarExpansionService</span><span class="p">(</span> |
| <span class="s1">'sdks:java:io:debezium:expansion-service:shadowJar'</span><span class="p">)</span> |
| |
| |
| <div class="viewcode-block" id="DriverClassName"><a class="viewcode-back" href="../../../apache_beam.io.debezium.html#apache_beam.io.debezium.DriverClassName">[docs]</a><span class="k">class</span> <span class="nc">DriverClassName</span><span class="p">(</span><span class="n">Enum</span><span class="p">):</span> |
| <span class="n">MYSQL</span> <span class="o">=</span> <span class="s1">'MySQL'</span> |
| <span class="n">POSTGRESQL</span> <span class="o">=</span> <span class="s1">'PostgreSQL'</span> |
| <span class="n">ORACLE</span> <span class="o">=</span> <span class="s1">'Oracle'</span> |
| <span class="n">DB2</span> <span class="o">=</span> <span class="s1">'Db2'</span></div> |
| |
| |
| <span class="n">ReadFromDebeziumSchema</span> <span class="o">=</span> <span class="n">NamedTuple</span><span class="p">(</span> |
| <span class="s1">'ReadFromDebeziumSchema'</span><span class="p">,</span> |
| <span class="p">[(</span><span class="s1">'connector_class'</span><span class="p">,</span> <span class="nb">str</span><span class="p">),</span> <span class="p">(</span><span class="s1">'username'</span><span class="p">,</span> <span class="nb">str</span><span class="p">),</span> <span class="p">(</span><span class="s1">'password'</span><span class="p">,</span> <span class="nb">str</span><span class="p">),</span> |
| <span class="p">(</span><span class="s1">'host'</span><span class="p">,</span> <span class="nb">str</span><span class="p">),</span> <span class="p">(</span><span class="s1">'port'</span><span class="p">,</span> <span class="nb">str</span><span class="p">),</span> <span class="p">(</span><span class="s1">'max_number_of_records'</span><span class="p">,</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">int</span><span class="p">]),</span> |
| <span class="p">(</span><span class="s1">'connection_properties'</span><span class="p">,</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">])])</span> |
| |
| |
| <span class="k">class</span> <span class="nc">_JsonStringToDictionaries</span><span class="p">(</span><span class="n">DoFn</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">""" A DoFn that consumes a JSON string and yields a python dictionary """</span> |
| <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">json_string</span><span class="p">):</span> |
| <span class="n">obj</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">json_string</span><span class="p">)</span> |
| <span class="k">yield</span> <span class="n">obj</span> |
| |
| |
| <div class="viewcode-block" id="ReadFromDebezium"><a class="viewcode-back" href="../../../apache_beam.io.debezium.html#apache_beam.io.debezium.ReadFromDebezium">[docs]</a><span class="k">class</span> <span class="nc">ReadFromDebezium</span><span class="p">(</span><span class="n">PTransform</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> An external PTransform which reads from Debezium and returns</span> |
| <span class="sd"> a Dictionary for each item in the specified database</span> |
| <span class="sd"> connection.</span> |
| |
| <span class="sd"> Experimental; no backwards compatibility guarantees.</span> |
| <span class="sd"> """</span> |
| <span class="n">URN</span> <span class="o">=</span> <span class="s1">'beam:transform:org.apache.beam:debezium_read:v1'</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span> |
| <span class="bp">self</span><span class="p">,</span> |
| <span class="n">connector_class</span><span class="p">,</span> |
| <span class="n">username</span><span class="p">,</span> |
| <span class="n">password</span><span class="p">,</span> |
| <span class="n">host</span><span class="p">,</span> |
| <span class="n">port</span><span class="p">,</span> |
| <span class="n">max_number_of_records</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="n">connection_properties</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> |
| <span class="n">expansion_service</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Initializes a read operation from Debezium.</span> |
| |
| <span class="sd"> :param connector_class: name of the jdbc driver class</span> |
| <span class="sd"> :param username: database username</span> |
| <span class="sd"> :param password: database password</span> |
| <span class="sd"> :param host: database host</span> |
| <span class="sd"> :param port: database port</span> |
| <span class="sd"> :param max_number_of_records: maximum number of records</span> |
| <span class="sd"> to be fetched before stop.</span> |
| <span class="sd"> :param connection_properties: properties of the debezium</span> |
| <span class="sd"> connection passed as string</span> |
| <span class="sd"> with format</span> |
| <span class="sd"> [propertyName=property;]*</span> |
| <span class="sd"> :param expansion_service: The address (host:port)</span> |
| <span class="sd"> of the ExpansionService.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">params</span> <span class="o">=</span> <span class="n">ReadFromDebeziumSchema</span><span class="p">(</span> |
| <span class="n">connector_class</span><span class="o">=</span><span class="n">connector_class</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> |
| <span class="n">username</span><span class="o">=</span><span class="n">username</span><span class="p">,</span> |
| <span class="n">password</span><span class="o">=</span><span class="n">password</span><span class="p">,</span> |
| <span class="n">host</span><span class="o">=</span><span class="n">host</span><span class="p">,</span> |
| <span class="n">port</span><span class="o">=</span><span class="n">port</span><span class="p">,</span> |
| <span class="n">max_number_of_records</span><span class="o">=</span><span class="n">max_number_of_records</span><span class="p">,</span> |
| <span class="n">connection_properties</span><span class="o">=</span><span class="n">connection_properties</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">expansion_service</span> <span class="o">=</span> <span class="n">expansion_service</span> <span class="ow">or</span> <span class="n">default_io_expansion_service</span><span class="p">()</span> |
| |
| <div class="viewcode-block" id="ReadFromDebezium.expand"><a class="viewcode-back" href="../../../apache_beam.io.debezium.html#apache_beam.io.debezium.ReadFromDebezium.expand">[docs]</a> <span class="k">def</span> <span class="nf">expand</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pbegin</span><span class="p">):</span> |
| <span class="k">return</span> <span class="p">(</span> |
| <span class="n">pbegin</span> <span class="o">|</span> <span class="n">ExternalTransform</span><span class="p">(</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">URN</span><span class="p">,</span> |
| <span class="n">NamedTupleBasedPayloadBuilder</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">params</span><span class="p">),</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">expansion_service</span><span class="p">,</span> |
| <span class="p">)</span> <span class="o">|</span> <span class="n">ParDo</span><span class="p">(</span><span class="n">_JsonStringToDictionaries</span><span class="p">()))</span></div></div> |
| </pre></div> |
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