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| <h1>Source code for airflow.contrib.operators.dynamodb_to_s3</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="c1">#</span> |
| |
| <span class="sd">"""</span> |
| <span class="sd">This module contains operators to replicate records from</span> |
| <span class="sd">DynamoDB table to S3.</span> |
| <span class="sd">"""</span> |
| |
| <span class="kn">from</span> <span class="nn">copy</span> <span class="kn">import</span> <span class="n">copy</span> |
| <span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">getsize</span> |
| <span class="kn">from</span> <span class="nn">tempfile</span> <span class="kn">import</span> <span class="n">NamedTemporaryFile</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Callable</span><span class="p">,</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">Optional</span> |
| <span class="kn">from</span> <span class="nn">uuid</span> <span class="kn">import</span> <span class="n">uuid4</span> |
| |
| <span class="kn">from</span> <span class="nn">boto.compat</span> <span class="kn">import</span> <span class="n">json</span> <span class="c1"># type: ignore</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.contrib.hooks.aws_dynamodb_hook</span> <span class="kn">import</span> <span class="n">AwsDynamoDBHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.hooks.S3_hook</span> <span class="kn">import</span> <span class="n">S3Hook</span> |
| <span class="kn">from</span> <span class="nn">airflow.models.baseoperator</span> <span class="kn">import</span> <span class="n">BaseOperator</span> |
| |
| |
| <div class="viewcode-block" id="_convert_item_to_json_bytes"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/dynamodb_to_s3/index.html#airflow.contrib.operators.dynamodb_to_s3._convert_item_to_json_bytes">[docs]</a><span class="k">def</span> <span class="nf">_convert_item_to_json_bytes</span><span class="p">(</span><span class="n">item</span><span class="p">):</span> |
| <span class="k">return</span> <span class="p">(</span><span class="n">json</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">item</span><span class="p">)</span> <span class="o">+</span> <span class="s1">'</span><span class="se">\n</span><span class="s1">'</span><span class="p">)</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="s1">'utf-8'</span><span class="p">)</span></div> |
| |
| |
| <div class="viewcode-block" id="_upload_file_to_s3"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/dynamodb_to_s3/index.html#airflow.contrib.operators.dynamodb_to_s3._upload_file_to_s3">[docs]</a><span class="k">def</span> <span class="nf">_upload_file_to_s3</span><span class="p">(</span><span class="n">file_obj</span><span class="p">,</span> <span class="n">bucket_name</span><span class="p">,</span> <span class="n">s3_key_prefix</span><span class="p">):</span> |
| <span class="n">s3_client</span> <span class="o">=</span> <span class="n">S3Hook</span><span class="p">()</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span> |
| <span class="n">file_obj</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="n">s3_client</span><span class="o">.</span><span class="n">upload_file</span><span class="p">(</span> |
| <span class="n">Filename</span><span class="o">=</span><span class="n">file_obj</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> |
| <span class="n">Bucket</span><span class="o">=</span><span class="n">bucket_name</span><span class="p">,</span> |
| <span class="n">Key</span><span class="o">=</span><span class="n">s3_key_prefix</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">uuid4</span><span class="p">()),</span></div> |
| <span class="p">)</span> |
| |
| |
| <div class="viewcode-block" id="DynamoDBToS3Operator"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/dynamodb_to_s3/index.html#airflow.contrib.operators.dynamodb_to_s3.DynamoDBToS3Operator">[docs]</a><span class="k">class</span> <span class="nc">DynamoDBToS3Operator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Replicates records from a DynamoDB table to S3.</span> |
| <span class="sd"> It scans a DynamoDB table and write the received records to a file</span> |
| <span class="sd"> on the local filesystem. It flushes the file to S3 once the file size</span> |
| <span class="sd"> exceeds the file size limit specified by the user.</span> |
| |
| <span class="sd"> Users can also specify a filtering criteria using dynamodb_scan_kwargs</span> |
| <span class="sd"> to only replicate records that satisfy the criteria.</span> |
| |
| <span class="sd"> To parallelize the replication, users can create multiple tasks of DynamoDBToS3Operator.</span> |
| <span class="sd"> For instance to replicate with parallelism of 2, create two tasks like:</span> |
| |
| <span class="sd"> .. code-block::</span> |
| |
| <span class="sd"> op1 = DynamoDBToS3Operator(</span> |
| <span class="sd"> task_id='replicator-1',</span> |
| <span class="sd"> dynamodb_table_name='hello',</span> |
| <span class="sd"> dynamodb_scan_kwargs={</span> |
| <span class="sd"> 'TotalSegments': 2,</span> |
| <span class="sd"> 'Segment': 0,</span> |
| <span class="sd"> },</span> |
| <span class="sd"> ...</span> |
| <span class="sd"> )</span> |
| |
| <span class="sd"> op2 = DynamoDBToS3Operator(</span> |
| <span class="sd"> task_id='replicator-2',</span> |
| <span class="sd"> dynamodb_table_name='hello',</span> |
| <span class="sd"> dynamodb_scan_kwargs={</span> |
| <span class="sd"> 'TotalSegments': 2,</span> |
| <span class="sd"> 'Segment': 1,</span> |
| <span class="sd"> },</span> |
| <span class="sd"> ...</span> |
| <span class="sd"> )</span> |
| |
| <span class="sd"> :param dynamodb_table_name: Dynamodb table to replicate data from</span> |
| <span class="sd"> :param s3_bucket_name: S3 bucket to replicate data to</span> |
| <span class="sd"> :param file_size: Flush file to s3 if file size >= file_size</span> |
| <span class="sd"> :param dynamodb_scan_kwargs: kwargs pass to <https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/dynamodb.html#DynamoDB.Table.scan> # noqa: E501 pylint: disable=line-too-long</span> |
| <span class="sd"> :param s3_key_prefix: Prefix of s3 object key</span> |
| <span class="sd"> :param process_func: How we transforms a dynamodb item to bytes. By default we dump the json</span> |
| <span class="sd"> """</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">dynamodb_table_name</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">s3_bucket_name</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">file_size</span><span class="p">,</span> <span class="c1"># ty: int</span> |
| <span class="n">dynamodb_scan_kwargs</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="c1"># type: Optional[Dict[str, Any]]</span> |
| <span class="n">s3_key_prefix</span><span class="o">=</span><span class="s1">''</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">process_func</span><span class="o">=</span><span class="n">_convert_item_to_json_bytes</span><span class="p">,</span> <span class="c1"># type: Callable[[Dict[str, Any]], bytes]</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">DynamoDBToS3Operator</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">file_size</span> <span class="o">=</span> <span class="n">file_size</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">process_func</span> <span class="o">=</span> <span class="n">process_func</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">dynamodb_table_name</span> <span class="o">=</span> <span class="n">dynamodb_table_name</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">dynamodb_scan_kwargs</span> <span class="o">=</span> <span class="n">dynamodb_scan_kwargs</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">s3_bucket_name</span> <span class="o">=</span> <span class="n">s3_bucket_name</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">s3_key_prefix</span> <span class="o">=</span> <span class="n">s3_key_prefix</span> |
| |
| <div class="viewcode-block" id="DynamoDBToS3Operator.execute"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/dynamodb_to_s3/index.html#airflow.contrib.operators.dynamodb_to_s3.DynamoDBToS3Operator.execute">[docs]</a> <span class="k">def</span> <span class="nf">execute</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span> |
| <span class="n">table</span> <span class="o">=</span> <span class="n">AwsDynamoDBHook</span><span class="p">()</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span><span class="o">.</span><span class="n">Table</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dynamodb_table_name</span><span class="p">)</span> |
| <span class="n">scan_kwargs</span> <span class="o">=</span> <span class="n">copy</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">dynamodb_scan_kwargs</span><span class="p">)</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">dynamodb_scan_kwargs</span> <span class="k">else</span> <span class="p">{}</span> |
| <span class="n">err</span> <span class="o">=</span> <span class="kc">None</span> |
| <span class="n">f</span> <span class="o">=</span> <span class="n">NamedTemporaryFile</span><span class="p">()</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="n">f</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_scan_dynamodb_and_upload_to_s3</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="n">scan_kwargs</span><span class="p">,</span> <span class="n">table</span><span class="p">)</span> |
| <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> |
| <span class="n">err</span> <span class="o">=</span> <span class="n">e</span> |
| <span class="k">raise</span> <span class="n">e</span> |
| <span class="k">finally</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">err</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">_upload_file_to_s3</span><span class="p">(</span><span class="n">f</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">s3_bucket_name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">s3_key_prefix</span><span class="p">)</span> |
| <span class="n">f</span><span class="o">.</span><span class="n">close</span><span class="p">()</span></div> |
| |
| <div class="viewcode-block" id="DynamoDBToS3Operator._scan_dynamodb_and_upload_to_s3"><a class="viewcode-back" href="../../../../_api/airflow/contrib/operators/dynamodb_to_s3/index.html#airflow.contrib.operators.dynamodb_to_s3.DynamoDBToS3Operator._scan_dynamodb_and_upload_to_s3">[docs]</a> <span class="k">def</span> <span class="nf">_scan_dynamodb_and_upload_to_s3</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">temp_file</span><span class="p">,</span> <span class="n">scan_kwargs</span><span class="p">,</span> <span class="n">table</span><span class="p">):</span> |
| <span class="k">while</span> <span class="kc">True</span><span class="p">:</span> |
| <span class="n">response</span> <span class="o">=</span> <span class="n">table</span><span class="o">.</span><span class="n">scan</span><span class="p">(</span><span class="o">**</span><span class="n">scan_kwargs</span><span class="p">)</span> |
| <span class="n">items</span> <span class="o">=</span> <span class="n">response</span><span class="p">[</span><span class="s1">'Items'</span><span class="p">]</span> |
| <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">items</span><span class="p">:</span> |
| <span class="n">temp_file</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">process_func</span><span class="p">(</span><span class="n">item</span><span class="p">))</span> |
| |
| <span class="k">if</span> <span class="s1">'LastEvaluatedKey'</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span> |
| <span class="c1"># no more items to scan</span> |
| <span class="k">break</span> |
| |
| <span class="n">last_evaluated_key</span> <span class="o">=</span> <span class="n">response</span><span class="p">[</span><span class="s1">'LastEvaluatedKey'</span><span class="p">]</span> |
| <span class="n">scan_kwargs</span><span class="p">[</span><span class="s1">'ExclusiveStartKey'</span><span class="p">]</span> <span class="o">=</span> <span class="n">last_evaluated_key</span> |
| |
| <span class="c1"># Upload the file to S3 if reach file size limit</span> |
| <span class="k">if</span> <span class="n">getsize</span><span class="p">(</span><span class="n">temp_file</span><span class="o">.</span><span class="n">name</span><span class="p">)</span> <span class="o">>=</span> <span class="bp">self</span><span class="o">.</span><span class="n">file_size</span><span class="p">:</span> |
| <span class="n">_upload_file_to_s3</span><span class="p">(</span><span class="n">temp_file</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">s3_bucket_name</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">s3_key_prefix</span><span class="p">)</span> |
| <span class="n">temp_file</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> |
| <span class="n">temp_file</span> <span class="o">=</span> <span class="n">NamedTemporaryFile</span><span class="p">()</span> |
| <span class="k">return</span> <span class="n">temp_file</span></div></div> |
| </pre></div> |
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