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| <h1>Source code for airflow.contrib.hooks.grpc_hook</h1><div class="highlight"><pre> |
| <span></span><span class="c1"># -*- coding: utf-8 -*-</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="sd">"""GRPC Hook"""</span> |
| |
| <span class="kn">import</span> <span class="nn">grpc</span> |
| <span class="kn">from</span> <span class="nn">google</span> <span class="kn">import</span> <span class="n">auth</span> <span class="k">as</span> <span class="n">google_auth</span> |
| <span class="kn">from</span> <span class="nn">google.auth</span> <span class="kn">import</span> <span class="n">jwt</span> <span class="k">as</span> <span class="n">google_auth_jwt</span> |
| <span class="kn">from</span> <span class="nn">google.auth.transport</span> <span class="kn">import</span> <span class="n">grpc</span> <span class="k">as</span> <span class="n">google_auth_transport_grpc</span> |
| <span class="kn">from</span> <span class="nn">google.auth.transport</span> <span class="kn">import</span> <span class="n">requests</span> <span class="k">as</span> <span class="n">google_auth_transport_requests</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.hooks.base_hook</span> <span class="kn">import</span> <span class="n">BaseHook</span> |
| <span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="kn">import</span> <span class="n">AirflowConfigException</span> |
| |
| |
| <div class="viewcode-block" id="GrpcHook"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/grpc_hook/index.html#airflow.contrib.hooks.grpc_hook.GrpcHook">[docs]</a><span class="k">class</span> <span class="nc">GrpcHook</span><span class="p">(</span><span class="n">BaseHook</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> General interaction with gRPC servers.</span> |
| |
| <span class="sd"> :param grpc_conn_id: The connection ID to use when fetching connection info.</span> |
| <span class="sd"> :type grpc_conn_id: str</span> |
| <span class="sd"> :param interceptors: a list of gRPC interceptor objects which would be applied</span> |
| <span class="sd"> to the connected gRPC channel. None by default.</span> |
| <span class="sd"> :type interceptors: a list of gRPC interceptors based on or extends the four</span> |
| <span class="sd"> official gRPC interceptors, eg, UnaryUnaryClientInterceptor,</span> |
| <span class="sd"> UnaryStreamClientInterceptor, StreamUnaryClientInterceptor,</span> |
| <span class="sd"> StreamStreamClientInterceptor.</span> |
| <span class="sd"> :param custom_connection_func: The customized connection function to return gRPC channel.</span> |
| <span class="sd"> :type custom_connection_func: python callable objects that accept the connection as</span> |
| <span class="sd"> its only arg. Could be partial or lambda.</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">grpc_conn_id</span><span class="p">,</span> <span class="n">interceptors</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">custom_connection_func</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">grpc_conn_id</span> <span class="o">=</span> <span class="n">grpc_conn_id</span> |
| <span class="bp">self</span><span class="o">.</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">grpc_conn_id</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">extras</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">extra_dejson</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">interceptors</span> <span class="o">=</span> <span class="n">interceptors</span> <span class="k">if</span> <span class="n">interceptors</span> <span class="k">else</span> <span class="p">[]</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">custom_connection_func</span> <span class="o">=</span> <span class="n">custom_connection_func</span> |
| |
| <div class="viewcode-block" id="GrpcHook.get_conn"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/grpc_hook/index.html#airflow.contrib.hooks.grpc_hook.GrpcHook.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">base_url</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">conn</span><span class="o">.</span><span class="n">host</span> |
| |
| <span class="k">if</span> <span class="bp">self</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="n">base_url</span> <span class="o">=</span> <span class="n">base_url</span> <span class="o">+</span> <span class="s2">":"</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</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="n">auth_type</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_field</span><span class="p">(</span><span class="s2">"auth_type"</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="n">auth_type</span> <span class="o">==</span> <span class="s2">"NO_AUTH"</span><span class="p">:</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="n">grpc</span><span class="o">.</span><span class="n">insecure_channel</span><span class="p">(</span><span class="n">base_url</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">auth_type</span> <span class="ow">in</span> <span class="p">{</span><span class="s2">"SSL"</span><span class="p">,</span> <span class="s2">"TLS"</span><span class="p">}:</span> |
| <span class="n">credential_file_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_field</span><span class="p">(</span><span class="s2">"credential_pem_file"</span><span class="p">)</span> |
| <span class="n">creds</span> <span class="o">=</span> <span class="n">grpc</span><span class="o">.</span><span class="n">ssl_channel_credentials</span><span class="p">(</span><span class="nb">open</span><span class="p">(</span><span class="n">credential_file_name</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">())</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="n">grpc</span><span class="o">.</span><span class="n">secure_channel</span><span class="p">(</span><span class="n">base_url</span><span class="p">,</span> <span class="n">creds</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">auth_type</span> <span class="o">==</span> <span class="s2">"JWT_GOOGLE"</span><span class="p">:</span> |
| <span class="n">credentials</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">google_auth</span><span class="o">.</span><span class="n">default</span><span class="p">()</span> |
| <span class="n">jwt_creds</span> <span class="o">=</span> <span class="n">google_auth_jwt</span><span class="o">.</span><span class="n">OnDemandCredentials</span><span class="o">.</span><span class="n">from_signing_credentials</span><span class="p">(</span> |
| <span class="n">credentials</span><span class="p">)</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="n">google_auth_transport_grpc</span><span class="o">.</span><span class="n">secure_authorized_channel</span><span class="p">(</span> |
| <span class="n">jwt_creds</span><span class="p">,</span> <span class="kc">None</span><span class="p">,</span> <span class="n">base_url</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">auth_type</span> <span class="o">==</span> <span class="s2">"OATH_GOOGLE"</span><span class="p">:</span> |
| <span class="n">scopes</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_field</span><span class="p">(</span><span class="s2">"scopes"</span><span class="p">)</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s2">","</span><span class="p">)</span> |
| <span class="n">credentials</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">google_auth</span><span class="o">.</span><span class="n">default</span><span class="p">(</span><span class="n">scopes</span><span class="o">=</span><span class="n">scopes</span><span class="p">)</span> |
| <span class="n">request</span> <span class="o">=</span> <span class="n">google_auth_transport_requests</span><span class="o">.</span><span class="n">Request</span><span class="p">()</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="n">google_auth_transport_grpc</span><span class="o">.</span><span class="n">secure_authorized_channel</span><span class="p">(</span> |
| <span class="n">credentials</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">base_url</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">auth_type</span> <span class="o">==</span> <span class="s2">"CUSTOM"</span><span class="p">:</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">custom_connection_func</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="n">AirflowConfigException</span><span class="p">(</span> |
| <span class="s2">"Customized connection function not set, not able to establish a channel"</span><span class="p">)</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">custom_connection_func</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">conn</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">raise</span> <span class="n">AirflowConfigException</span><span class="p">(</span> |
| <span class="s2">"auth_type not supported or not provided, channel cannot be established,</span><span class="se">\</span> |
| <span class="s2"> given value: </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="nb">str</span><span class="p">(</span><span class="n">auth_type</span><span class="p">))</span> |
| |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">interceptors</span><span class="p">:</span> |
| <span class="k">for</span> <span class="n">interceptor</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">interceptors</span><span class="p">:</span> |
| <span class="n">channel</span> <span class="o">=</span> <span class="n">grpc</span><span class="o">.</span><span class="n">intercept_channel</span><span class="p">(</span><span class="n">channel</span><span class="p">,</span> |
| <span class="n">interceptor</span><span class="p">)</span> |
| |
| <span class="k">return</span> <span class="n">channel</span></div> |
| |
| <div class="viewcode-block" id="GrpcHook.run"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/grpc_hook/index.html#airflow.contrib.hooks.grpc_hook.GrpcHook.run">[docs]</a> <span class="k">def</span> <span class="nf">run</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stub_class</span><span class="p">,</span> <span class="n">call_func</span><span class="p">,</span> <span class="n">streaming</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">data</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="k">if</span> <span class="n">data</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">data</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="k">with</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">channel</span><span class="p">:</span> |
| <span class="n">stub</span> <span class="o">=</span> <span class="n">stub_class</span><span class="p">(</span><span class="n">channel</span><span class="p">)</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="n">rpc_func</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">stub</span><span class="p">,</span> <span class="n">call_func</span><span class="p">)</span> |
| <span class="n">response</span> <span class="o">=</span> <span class="n">rpc_func</span><span class="p">(</span><span class="o">**</span><span class="n">data</span><span class="p">)</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">streaming</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">response</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">for</span> <span class="n">single_response</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">single_response</span> |
| <span class="k">except</span> <span class="n">grpc</span><span class="o">.</span><span class="n">RpcError</span> <span class="k">as</span> <span class="n">ex</span><span class="p">:</span> |
| <span class="c1"># noinspection PyUnresolvedReferences</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span> |
| <span class="s2">"Error occurred when calling the grpc service: </span><span class="si">{0}</span><span class="s2">, method: </span><span class="si">{1}</span><span class="s2"> </span><span class="se">\</span> |
| <span class="s2"> status code: </span><span class="si">{2}</span><span class="s2">, error details: </span><span class="si">{3}</span><span class="s2">"</span> |
| <span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">stub</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> |
| <span class="n">call_func</span><span class="p">,</span> |
| <span class="n">ex</span><span class="o">.</span><span class="n">code</span><span class="p">(),</span> <span class="c1"># pylint: disable=no-member</span> |
| <span class="n">ex</span><span class="o">.</span><span class="n">details</span><span class="p">()))</span> <span class="c1"># pylint: disable=no-member</span> |
| <span class="k">raise</span> <span class="n">ex</span></div> |
| |
| <div class="viewcode-block" id="GrpcHook._get_field"><a class="viewcode-back" href="../../../../_api/airflow/contrib/hooks/grpc_hook/index.html#airflow.contrib.hooks.grpc_hook.GrpcHook._get_field">[docs]</a> <span class="k">def</span> <span class="nf">_get_field</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">field_name</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Fetches a field from extras, and returns it. This is some Airflow</span> |
| <span class="sd"> magic. The grpc hook type adds custom UI elements</span> |
| <span class="sd"> to the hook page, which allow admins to specify scopes, credential pem files, etc.</span> |
| <span class="sd"> They get formatted as shown below.</span> |
| <span class="sd"> """</span> |
| <span class="n">full_field_name</span> <span class="o">=</span> <span class="s1">'extra__grpc__</span><span class="si">{}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">field_name</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">full_field_name</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">extras</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">extras</span><span class="p">[</span><span class="n">full_field_name</span><span class="p">]</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">return</span> <span class="n">default</span></div></div> |
| </pre></div> |
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