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Posted to commits@airflow.apache.org by ka...@apache.org on 2018/08/27 16:26:22 UTC
[02/51] [partial] incubator-airflow-site git commit: 1.10.0
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+ <h1>Source code for airflow.sensors.web_hdfs_sensor</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">from</span> <span class="nn">airflow.sensors.base_sensor_operator</span> <span class="k">import</span> <span class="n">BaseSensorOperator</span>
+<span class="kn">from</span> <span class="nn">airflow.utils.decorators</span> <span class="k">import</span> <span class="n">apply_defaults</span>
+
+
+<div class="viewcode-block" id="WebHdfsSensor"><a class="viewcode-back" href="../../../code.html#airflow.sensors.web_hdfs_sensor.WebHdfsSensor">[docs]</a><span class="k">class</span> <span class="nc">WebHdfsSensor</span><span class="p">(</span><span class="n">BaseSensorOperator</span><span class="p">):</span>
+ <span class="sd">"""</span>
+<span class="sd"> Waits for a file or folder to land in HDFS</span>
+<span class="sd"> """</span>
+ <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'filepath'</span><span class="p">,)</span>
+
+ <span class="nd">@apply_defaults</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="n">filepath</span><span class="p">,</span>
+ <span class="n">webhdfs_conn_id</span><span class="o">=</span><span class="s1">'webhdfs_default'</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">WebHdfsSensor</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">filepath</span> <span class="o">=</span> <span class="n">filepath</span>
+ <span class="bp">self</span><span class="o">.</span><span class="n">webhdfs_conn_id</span> <span class="o">=</span> <span class="n">webhdfs_conn_id</span>
+
+ <span class="k">def</span> <span class="nf">poke</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="kn">from</span> <span class="nn">airflow.hooks.webhdfs_hook</span> <span class="k">import</span> <span class="n">WebHDFSHook</span>
+ <span class="n">c</span> <span class="o">=</span> <span class="n">WebHDFSHook</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">webhdfs_conn_id</span><span class="p">)</span>
+ <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Poking for file </span><span class="si">{self.filepath}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="nb">locals</span><span class="p">()))</span>
+ <span class="k">return</span> <span class="n">c</span><span class="o">.</span><span class="n">check_for_path</span><span class="p">(</span><span class="n">hdfs_path</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">filepath</span><span class="p">)</span></div>
+</pre></div>
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- <h1>Source code for bash_operator</h1><div class="highlight"><pre>
-<span></span><span class="c1"># -*- coding: utf-8 -*-</span>
-<span class="c1">#</span>
-<span class="c1"># Licensed under the Apache License, Version 2.0 (the "License");</span>
-<span class="c1"># you may not use this file except in compliance with the License.</span>
-<span class="c1"># 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="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">bytes</span>
-<span class="kn">import</span> <span class="nn">os</span>
-<span class="kn">import</span> <span class="nn">signal</span>
-<span class="kn">from</span> <span class="nn">subprocess</span> <span class="k">import</span> <span class="n">Popen</span><span class="p">,</span> <span class="n">STDOUT</span><span class="p">,</span> <span class="n">PIPE</span>
-<span class="kn">from</span> <span class="nn">tempfile</span> <span class="k">import</span> <span class="n">gettempdir</span><span class="p">,</span> <span class="n">NamedTemporaryFile</span>
-
-<span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="k">import</span> <span class="n">AirflowException</span>
-<span class="kn">from</span> <span class="nn">airflow.models</span> <span class="k">import</span> <span class="n">BaseOperator</span>
-<span class="kn">from</span> <span class="nn">airflow.utils.decorators</span> <span class="k">import</span> <span class="n">apply_defaults</span>
-<span class="kn">from</span> <span class="nn">airflow.utils.file</span> <span class="k">import</span> <span class="n">TemporaryDirectory</span>
-
-
-<div class="viewcode-block" id="BashOperator"><a class="viewcode-back" href="../code.html#airflow.operators.BashOperator">[docs]</a><span class="k">class</span> <span class="nc">BashOperator</span><span class="p">(</span><span class="n">BaseOperator</span><span class="p">):</span>
- <span class="sd">"""</span>
-<span class="sd"> Execute a Bash script, command or set of commands.</span>
-
-<span class="sd"> :param bash_command: The command, set of commands or reference to a</span>
-<span class="sd"> bash script (must be '.sh') to be executed.</span>
-<span class="sd"> :type bash_command: string</span>
-<span class="sd"> :param xcom_push: If xcom_push is True, the last line written to stdout</span>
-<span class="sd"> will also be pushed to an XCom when the bash command completes.</span>
-<span class="sd"> :type xcom_push: bool</span>
-<span class="sd"> :param env: If env is not None, it must be a mapping that defines the</span>
-<span class="sd"> environment variables for the new process; these are used instead</span>
-<span class="sd"> of inheriting the current process environment, which is the default</span>
-<span class="sd"> behavior. (templated)</span>
-<span class="sd"> :type env: dict</span>
-<span class="sd"> :type output_encoding: output encoding of bash command</span>
-<span class="sd"> """</span>
- <span class="n">template_fields</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'bash_command'</span><span class="p">,</span> <span class="s1">'env'</span><span class="p">)</span>
- <span class="n">template_ext</span> <span class="o">=</span> <span class="p">(</span><span class="s1">'.sh'</span><span class="p">,</span> <span class="s1">'.bash'</span><span class="p">,)</span>
- <span class="n">ui_color</span> <span class="o">=</span> <span class="s1">'#f0ede4'</span>
-
- <span class="nd">@apply_defaults</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="n">bash_command</span><span class="p">,</span>
- <span class="n">xcom_push</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
- <span class="n">env</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
- <span class="n">output_encoding</span><span class="o">=</span><span class="s1">'utf-8'</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">BashOperator</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">bash_command</span> <span class="o">=</span> <span class="n">bash_command</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">env</span> <span class="o">=</span> <span class="n">env</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">xcom_push_flag</span> <span class="o">=</span> <span class="n">xcom_push</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">output_encoding</span> <span class="o">=</span> <span class="n">output_encoding</span>
-
-<div class="viewcode-block" id="BashOperator.execute"><a class="viewcode-back" href="../code.html#airflow.operators.BashOperator.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="sd">"""</span>
-<span class="sd"> Execute the bash command in a temporary directory</span>
-<span class="sd"> which will be cleaned afterwards</span>
-<span class="sd"> """</span>
- <span class="n">bash_command</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bash_command</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Tmp dir root location: </span><span class="se">\n</span><span class="s2"> </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">gettempdir</span><span class="p">())</span>
- <span class="k">with</span> <span class="n">TemporaryDirectory</span><span class="p">(</span><span class="n">prefix</span><span class="o">=</span><span class="s1">'airflowtmp'</span><span class="p">)</span> <span class="k">as</span> <span class="n">tmp_dir</span><span class="p">:</span>
- <span class="k">with</span> <span class="n">NamedTemporaryFile</span><span class="p">(</span><span class="nb">dir</span><span class="o">=</span><span class="n">tmp_dir</span><span class="p">,</span> <span class="n">prefix</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">task_id</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
-
- <span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="nb">bytes</span><span class="p">(</span><span class="n">bash_command</span><span class="p">,</span> <span class="s1">'utf_8'</span><span class="p">))</span>
- <span class="n">f</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span>
- <span class="n">fname</span> <span class="o">=</span> <span class="n">f</span><span class="o">.</span><span class="n">name</span>
- <span class="n">script_location</span> <span class="o">=</span> <span class="n">tmp_dir</span> <span class="o">+</span> <span class="s2">"/"</span> <span class="o">+</span> <span class="n">fname</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span>
- <span class="s2">"Temporary script location: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span>
- <span class="n">script_location</span>
- <span class="p">)</span>
- <span class="k">def</span> <span class="nf">pre_exec</span><span class="p">():</span>
- <span class="c1"># Restore default signal disposition and invoke setsid</span>
- <span class="k">for</span> <span class="n">sig</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">'SIGPIPE'</span><span class="p">,</span> <span class="s1">'SIGXFZ'</span><span class="p">,</span> <span class="s1">'SIGXFSZ'</span><span class="p">):</span>
- <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">signal</span><span class="p">,</span> <span class="n">sig</span><span class="p">):</span>
- <span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="nb">getattr</span><span class="p">(</span><span class="n">signal</span><span class="p">,</span> <span class="n">sig</span><span class="p">),</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_DFL</span><span class="p">)</span>
- <span class="n">os</span><span class="o">.</span><span class="n">setsid</span><span class="p">()</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Running command: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">bash_command</span><span class="p">)</span>
- <span class="n">sp</span> <span class="o">=</span> <span class="n">Popen</span><span class="p">(</span>
- <span class="p">[</span><span class="s1">'bash'</span><span class="p">,</span> <span class="n">fname</span><span class="p">],</span>
- <span class="n">stdout</span><span class="o">=</span><span class="n">PIPE</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">STDOUT</span><span class="p">,</span>
- <span class="n">cwd</span><span class="o">=</span><span class="n">tmp_dir</span><span class="p">,</span> <span class="n">env</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="p">,</span>
- <span class="n">preexec_fn</span><span class="o">=</span><span class="n">pre_exec</span><span class="p">)</span>
-
- <span class="bp">self</span><span class="o">.</span><span class="n">sp</span> <span class="o">=</span> <span class="n">sp</span>
-
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Output:"</span><span class="p">)</span>
- <span class="n">line</span> <span class="o">=</span> <span class="s1">''</span>
- <span class="k">for</span> <span class="n">line</span> <span class="ow">in</span> <span class="nb">iter</span><span class="p">(</span><span class="n">sp</span><span class="o">.</span><span class="n">stdout</span><span class="o">.</span><span class="n">readline</span><span class="p">,</span> <span class="sa">b</span><span class="s1">''</span><span class="p">):</span>
- <span class="n">line</span> <span class="o">=</span> <span class="n">line</span><span class="o">.</span><span class="n">decode</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">output_encoding</span><span class="p">)</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="n">line</span><span class="p">)</span>
- <span class="n">sp</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span>
- <span class="s2">"Command exited with return code </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span>
- <span class="n">sp</span><span class="o">.</span><span class="n">returncode</span>
- <span class="p">)</span>
-
- <span class="k">if</span> <span class="n">sp</span><span class="o">.</span><span class="n">returncode</span><span class="p">:</span>
- <span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s2">"Bash command failed"</span><span class="p">)</span>
-
- <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">xcom_push_flag</span><span class="p">:</span>
- <span class="k">return</span> <span class="n">line</span></div>
-
- <span class="k">def</span> <span class="nf">on_kill</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
- <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s1">'Sending SIGTERM signal to bash process group'</span><span class="p">)</span>
- <span class="n">os</span><span class="o">.</span><span class="n">killpg</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">getpgid</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">sp</span><span class="o">.</span><span class="n">pid</span><span class="p">),</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIGTERM</span><span class="p">)</span></div>
-
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