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| <h1>Source code for apache_beam.utils.urns</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">"""For internal use only; no backwards-compatibility guarantees."""</span> |
| |
| <span class="c1"># pytype: skip-file</span> |
| |
| <span class="c1"># TODO(https://github.com/apache/beam/issues/18399): Issue with dill + local</span> |
| <span class="c1"># classes + abc metaclass</span> |
| <span class="c1"># import abc</span> |
| <span class="kn">import</span> <span class="nn">inspect</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">TYPE_CHECKING</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Callable</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Dict</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">typing</span> <span class="kn">import</span> <span class="n">Tuple</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Type</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">TypeVar</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Union</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">overload</span> |
| |
| <span class="kn">from</span> <span class="nn">google.protobuf</span> <span class="kn">import</span> <span class="n">message</span> |
| <span class="kn">from</span> <span class="nn">google.protobuf</span> <span class="kn">import</span> <span class="n">wrappers_pb2</span> |
| |
| <span class="kn">from</span> <span class="nn">apache_beam.internal</span> <span class="kn">import</span> <span class="n">pickler</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.utils</span> <span class="kn">import</span> <span class="n">proto_utils</span> |
| |
| <span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.portability.api</span> <span class="kn">import</span> <span class="n">beam_runner_api_pb2</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.runners.pipeline_context</span> <span class="kn">import</span> <span class="n">PipelineContext</span> |
| |
| <span class="n">T</span> <span class="o">=</span> <span class="n">TypeVar</span><span class="p">(</span><span class="s1">'T'</span><span class="p">)</span> |
| <span class="n">RunnerApiFnT</span> <span class="o">=</span> <span class="n">TypeVar</span><span class="p">(</span><span class="s1">'RunnerApiFnT'</span><span class="p">,</span> <span class="n">bound</span><span class="o">=</span><span class="s1">'RunnerApiFn'</span><span class="p">)</span> |
| <span class="n">ConstructorFn</span> <span class="o">=</span> <span class="n">Callable</span><span class="p">[[</span><span class="n">Union</span><span class="p">[</span><span class="s1">'message.Message'</span><span class="p">,</span> <span class="nb">bytes</span><span class="p">],</span> <span class="s1">'PipelineContext'</span><span class="p">],</span> |
| <span class="n">Any</span><span class="p">]</span> |
| |
| |
| <div class="viewcode-block" id="RunnerApiFn"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn">[docs]</a><span class="k">class</span> <span class="nc">RunnerApiFn</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">"""Abstract base class that provides urn registration utilities.</span> |
| |
| <span class="sd"> A class that inherits from this class will get a registration-based</span> |
| <span class="sd"> from_runner_api and to_runner_api method that convert to and from</span> |
| <span class="sd"> beam_runner_api_pb2.FunctionSpec.</span> |
| |
| <span class="sd"> Additionally, register_pickle_urn can be called from the body of a class</span> |
| <span class="sd"> to register serialization via pickling.</span> |
| <span class="sd"> """</span> |
| |
| <span class="c1"># TODO(https://github.com/apache/beam/issues/18399): Issue with dill + local</span> |
| <span class="c1"># classes + abc metaclass</span> |
| <span class="c1"># __metaclass__ = abc.ABCMeta</span> |
| |
| <span class="n">_known_urns</span> <span class="o">=</span> <span class="p">{}</span> <span class="c1"># type: Dict[str, Tuple[Optional[type], ConstructorFn]]</span> |
| |
| <span class="c1"># @abc.abstractmethod is disabled here to avoid an error with mypy. mypy</span> |
| <span class="c1"># performs abc.abtractmethod/property checks even if a class does</span> |
| <span class="c1"># not use abc.ABCMeta, however, functions like `register_pickle_urn`</span> |
| <span class="c1"># dynamically patch `to_runner_api_parameter`, which mypy cannot track, so</span> |
| <span class="c1"># mypy incorrectly infers that this method has not been overridden with a</span> |
| <span class="c1"># concrete implementation.</span> |
| <span class="c1"># @abc.abstractmethod</span> |
| <div class="viewcode-block" id="RunnerApiFn.to_runner_api_parameter"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn.to_runner_api_parameter">[docs]</a> <span class="k">def</span> <span class="nf">to_runner_api_parameter</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">unused_context</span><span class="p">):</span> |
| <span class="c1"># type: (PipelineContext) -> Tuple[str, Any]</span> |
| |
| <span class="w"> </span><span class="sd">"""Returns the urn and payload for this Fn.</span> |
| |
| <span class="sd"> The returned urn(s) should be registered with `register_urn`.</span> |
| <span class="sd"> """</span> |
| <span class="k">raise</span> <span class="ne">NotImplementedError</span></div> |
| |
| <span class="nd">@classmethod</span> |
| <span class="nd">@overload</span> |
| <span class="k">def</span> <span class="nf">register_urn</span><span class="p">(</span> |
| <span class="bp">cls</span><span class="p">,</span> |
| <span class="n">urn</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">parameter_type</span><span class="p">,</span> <span class="c1"># type: Type[T]</span> |
| <span class="p">):</span> |
| <span class="c1"># type: (...) -> Callable[[Callable[[T, PipelineContext], Any]], Callable[[T, PipelineContext], Any]]</span> |
| <span class="k">pass</span> |
| |
| <span class="nd">@classmethod</span> |
| <span class="nd">@overload</span> |
| <span class="k">def</span> <span class="nf">register_urn</span><span class="p">(</span> |
| <span class="bp">cls</span><span class="p">,</span> |
| <span class="n">urn</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">parameter_type</span><span class="p">,</span> <span class="c1"># type: None</span> |
| <span class="p">):</span> |
| <span class="c1"># type: (...) -> Callable[[Callable[[bytes, PipelineContext], Any]], Callable[[bytes, PipelineContext], Any]]</span> |
| <span class="k">pass</span> |
| |
| <span class="nd">@classmethod</span> |
| <span class="nd">@overload</span> |
| <span class="k">def</span> <span class="nf">register_urn</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> |
| <span class="n">urn</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">parameter_type</span><span class="p">,</span> <span class="c1"># type: Type[T]</span> |
| <span class="n">fn</span> <span class="c1"># type: Callable[[T, PipelineContext], Any]</span> |
| <span class="p">):</span> |
| <span class="c1"># type: (...) -> None</span> |
| <span class="k">pass</span> |
| |
| <span class="nd">@classmethod</span> |
| <span class="nd">@overload</span> |
| <span class="k">def</span> <span class="nf">register_urn</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> |
| <span class="n">urn</span><span class="p">,</span> <span class="c1"># type: str</span> |
| <span class="n">parameter_type</span><span class="p">,</span> <span class="c1"># type: None</span> |
| <span class="n">fn</span> <span class="c1"># type: Callable[[bytes, PipelineContext], Any]</span> |
| <span class="p">):</span> |
| <span class="c1"># type: (...) -> None</span> |
| <span class="k">pass</span> |
| |
| <div class="viewcode-block" id="RunnerApiFn.register_urn"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn.register_urn">[docs]</a> <span class="nd">@classmethod</span> |
| <span class="k">def</span> <span class="nf">register_urn</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">urn</span><span class="p">,</span> <span class="n">parameter_type</span><span class="p">,</span> <span class="n">fn</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">"""Registers a urn with a constructor.</span> |
| |
| <span class="sd"> For example, if 'beam:fn:foo' had parameter type FooPayload, one could</span> |
| <span class="sd"> write `RunnerApiFn.register_urn('bean:fn:foo', FooPayload, foo_from_proto)`</span> |
| <span class="sd"> where foo_from_proto took as arguments a FooPayload and a PipelineContext.</span> |
| <span class="sd"> This function can also be used as a decorator rather than passing the</span> |
| <span class="sd"> callable in as the final parameter.</span> |
| |
| <span class="sd"> A corresponding to_runner_api_parameter method would be expected that</span> |
| <span class="sd"> returns the tuple ('beam:fn:foo', FooPayload)</span> |
| <span class="sd"> """</span> |
| <span class="k">def</span> <span class="nf">register</span><span class="p">(</span><span class="n">fn</span><span class="p">):</span> |
| <span class="bp">cls</span><span class="o">.</span><span class="n">_known_urns</span><span class="p">[</span><span class="n">urn</span><span class="p">]</span> <span class="o">=</span> <span class="n">parameter_type</span><span class="p">,</span> <span class="n">fn</span> |
| <span class="k">return</span> <span class="n">fn</span> |
| |
| <span class="k">if</span> <span class="n">fn</span><span class="p">:</span> |
| <span class="c1"># Used as a statement.</span> |
| <span class="n">register</span><span class="p">(</span><span class="n">fn</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="c1"># Used as a decorator.</span> |
| <span class="k">return</span> <span class="n">register</span></div> |
| |
| <div class="viewcode-block" id="RunnerApiFn.register_pickle_urn"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn.register_pickle_urn">[docs]</a> <span class="nd">@classmethod</span> |
| <span class="k">def</span> <span class="nf">register_pickle_urn</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">pickle_urn</span><span class="p">):</span> |
| <span class="w"> </span><span class="sd">"""Registers and implements the given urn via pickling.</span> |
| <span class="sd"> """</span> |
| <span class="n">inspect</span><span class="o">.</span><span class="n">currentframe</span><span class="p">()</span><span class="o">.</span><span class="n">f_back</span><span class="o">.</span><span class="n">f_locals</span><span class="p">[</span><span class="s1">'to_runner_api_parameter'</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span> |
| <span class="k">lambda</span> <span class="bp">self</span><span class="p">,</span> |
| <span class="n">context</span><span class="p">:</span> |
| <span class="p">(</span><span class="n">pickle_urn</span><span class="p">,</span> <span class="n">wrappers_pb2</span><span class="o">.</span><span class="n">BytesValue</span><span class="p">(</span><span class="n">value</span><span class="o">=</span><span class="n">pickler</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="bp">self</span><span class="p">))))</span> |
| <span class="bp">cls</span><span class="o">.</span><span class="n">register_urn</span><span class="p">(</span> |
| <span class="n">pickle_urn</span><span class="p">,</span> |
| <span class="n">wrappers_pb2</span><span class="o">.</span><span class="n">BytesValue</span><span class="p">,</span> |
| <span class="k">lambda</span> <span class="n">proto</span><span class="p">,</span> |
| <span class="n">unused_context</span><span class="p">:</span> <span class="n">pickler</span><span class="o">.</span><span class="n">loads</span><span class="p">(</span><span class="n">proto</span><span class="o">.</span><span class="n">value</span><span class="p">))</span></div> |
| |
| <div class="viewcode-block" id="RunnerApiFn.to_runner_api"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn.to_runner_api">[docs]</a> <span class="k">def</span> <span class="nf">to_runner_api</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="c1"># type: (PipelineContext) -> beam_runner_api_pb2.FunctionSpec</span> |
| |
| <span class="w"> </span><span class="sd">"""Returns an FunctionSpec encoding this Fn.</span> |
| |
| <span class="sd"> Prefer overriding self.to_runner_api_parameter.</span> |
| <span class="sd"> """</span> |
| <span class="kn">from</span> <span class="nn">apache_beam.portability.api</span> <span class="kn">import</span> <span class="n">beam_runner_api_pb2</span> |
| <span class="n">urn</span><span class="p">,</span> <span class="n">typed_param</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">to_runner_api_parameter</span><span class="p">(</span><span class="n">context</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">beam_runner_api_pb2</span><span class="o">.</span><span class="n">FunctionSpec</span><span class="p">(</span> |
| <span class="n">urn</span><span class="o">=</span><span class="n">urn</span><span class="p">,</span> |
| <span class="n">payload</span><span class="o">=</span><span class="n">typed_param</span><span class="o">.</span><span class="n">SerializeToString</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span> |
| <span class="n">typed_param</span><span class="p">,</span> <span class="n">message</span><span class="o">.</span><span class="n">Message</span><span class="p">)</span> <span class="k">else</span> <span class="n">typed_param</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="RunnerApiFn.from_runner_api"><a class="viewcode-back" href="../../../apache_beam.utils.urns.html#apache_beam.transforms.core.RunnerApiFn.from_runner_api">[docs]</a> <span class="nd">@classmethod</span> |
| <span class="k">def</span> <span class="nf">from_runner_api</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">fn_proto</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span> |
| <span class="c1"># type: (Type[RunnerApiFnT], beam_runner_api_pb2.FunctionSpec, PipelineContext) -> RunnerApiFnT</span> |
| |
| <span class="w"> </span><span class="sd">"""Converts from an FunctionSpec to a Fn object.</span> |
| |
| <span class="sd"> Prefer registering a urn with its parameter type and constructor.</span> |
| <span class="sd"> """</span> |
| <span class="n">parameter_type</span><span class="p">,</span> <span class="n">constructor</span> <span class="o">=</span> <span class="bp">cls</span><span class="o">.</span><span class="n">_known_urns</span><span class="p">[</span><span class="n">fn_proto</span><span class="o">.</span><span class="n">urn</span><span class="p">]</span> |
| <span class="k">return</span> <span class="n">constructor</span><span class="p">(</span> |
| <span class="n">proto_utils</span><span class="o">.</span><span class="n">parse_Bytes</span><span class="p">(</span><span class="n">fn_proto</span><span class="o">.</span><span class="n">payload</span><span class="p">,</span> <span class="n">parameter_type</span><span class="p">),</span> <span class="n">context</span><span class="p">)</span></div></div> |
| </pre></div> |
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