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Posted to commits@airflow.apache.org by ka...@apache.org on 2018/08/27 16:27:04 UTC
[44/51] [partial] incubator-airflow-site git commit: 1.10.0
http://git-wip-us.apache.org/repos/asf/incubator-airflow-site/blob/11437c14/_modules/airflow/contrib/hooks/gcp_pubsub_hook.html
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+ <h1>Source code for airflow.contrib.hooks.gcp_pubsub_hook</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">uuid</span> <span class="k">import</span> <span class="n">uuid4</span>
+
+<span class="kn">from</span> <span class="nn">apiclient.discovery</span> <span class="k">import</span> <span class="n">build</span>
+<span class="kn">from</span> <span class="nn">apiclient</span> <span class="k">import</span> <span class="n">errors</span>
+
+<span class="kn">from</span> <span class="nn">airflow.contrib.hooks.gcp_api_base_hook</span> <span class="k">import</span> <span class="n">GoogleCloudBaseHook</span>
+
+
+<span class="k">def</span> <span class="nf">_format_subscription</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">):</span>
+ <span class="k">return</span> <span class="s1">'projects/</span><span class="si">{}</span><span class="s1">/subscriptions/</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">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">)</span>
+
+
+<span class="k">def</span> <span class="nf">_format_topic</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">):</span>
+ <span class="k">return</span> <span class="s1">'projects/</span><span class="si">{}</span><span class="s1">/topics/</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">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">)</span>
+
+
+<span class="k">class</span> <span class="nc">PubSubException</span><span class="p">(</span><span class="ne">Exception</span><span class="p">):</span>
+ <span class="k">pass</span>
+
+
+<div class="viewcode-block" id="PubSubHook"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook">[docs]</a><span class="k">class</span> <span class="nc">PubSubHook</span><span class="p">(</span><span class="n">GoogleCloudBaseHook</span><span class="p">):</span>
+ <span class="sd">"""Hook for accessing Google Pub/Sub.</span>
+
+<span class="sd"> The GCP project against which actions are applied is determined by</span>
+<span class="sd"> the project embedded in the Connection referenced by gcp_conn_id.</span>
+<span class="sd"> """</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">gcp_conn_id</span><span class="o">=</span><span class="s1">'google_cloud_default'</span><span class="p">,</span> <span class="n">delegate_to</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
+ <span class="nb">super</span><span class="p">(</span><span class="n">PubSubHook</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="n">gcp_conn_id</span><span class="p">,</span> <span class="n">delegate_to</span><span class="o">=</span><span class="n">delegate_to</span><span class="p">)</span>
+
+<div class="viewcode-block" id="PubSubHook.get_conn"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.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="sd">"""Returns a Pub/Sub service object.</span>
+
+<span class="sd"> :rtype: apiclient.discovery.Resource</span>
+<span class="sd"> """</span>
+ <span class="n">http_authorized</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_authorize</span><span class="p">()</span>
+ <span class="k">return</span> <span class="n">build</span><span class="p">(</span><span class="s1">'pubsub'</span><span class="p">,</span> <span class="s1">'v1'</span><span class="p">,</span> <span class="n">http</span><span class="o">=</span><span class="n">http_authorized</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.publish"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.publish">[docs]</a> <span class="k">def</span> <span class="nf">publish</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">,</span> <span class="n">messages</span><span class="p">):</span>
+ <span class="sd">"""Publishes messages to a Pub/Sub topic.</span>
+
+<span class="sd"> :param project: the GCP project ID in which to publish</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param topic: the Pub/Sub topic to which to publish; do not</span>
+<span class="sd"> include the ``projects/{project}/topics/`` prefix.</span>
+<span class="sd"> :type topic: string</span>
+<span class="sd"> :param messages: messages to publish; if the data field in a</span>
+<span class="sd"> message is set, it should already be base64 encoded.</span>
+<span class="sd"> :type messages: list of PubSub messages; see</span>
+<span class="sd"> http://cloud.google.com/pubsub/docs/reference/rest/v1/PubsubMessage</span>
+<span class="sd"> """</span>
+ <span class="n">body</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'messages'</span><span class="p">:</span> <span class="n">messages</span><span class="p">}</span>
+ <span class="n">full_topic</span> <span class="o">=</span> <span class="n">_format_topic</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">)</span>
+ <span class="n">request</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">topics</span><span class="p">()</span><span class="o">.</span><span class="n">publish</span><span class="p">(</span>
+ <span class="n">topic</span><span class="o">=</span><span class="n">full_topic</span><span class="p">,</span> <span class="n">body</span><span class="o">=</span><span class="n">body</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">request</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error publishing to topic </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">full_topic</span><span class="p">),</span> <span class="n">e</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.create_topic"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.create_topic">[docs]</a> <span class="k">def</span> <span class="nf">create_topic</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">,</span> <span class="n">fail_if_exists</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
+ <span class="sd">"""Creates a Pub/Sub topic, if it does not already exist.</span>
+
+<span class="sd"> :param project: the GCP project ID in which to create</span>
+<span class="sd"> the topic</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param topic: the Pub/Sub topic name to create; do not</span>
+<span class="sd"> include the ``projects/{project}/topics/`` prefix.</span>
+<span class="sd"> :type topic: string</span>
+<span class="sd"> :param fail_if_exists: if set, raise an exception if the topic</span>
+<span class="sd"> already exists</span>
+<span class="sd"> :type fail_if_exists: bool</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_topic</span> <span class="o">=</span> <span class="n">_format_topic</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">topics</span><span class="p">()</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
+ <span class="n">name</span><span class="o">=</span><span class="n">full_topic</span><span class="p">,</span> <span class="n">body</span><span class="o">=</span><span class="p">{})</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="c1"># Status code 409 indicates that the topic already exists.</span>
+ <span class="k">if</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">resp</span><span class="p">[</span><span class="s1">'status'</span><span class="p">])</span> <span class="o">==</span> <span class="s1">'409'</span><span class="p">:</span>
+ <span class="n">message</span> <span class="o">=</span> <span class="s1">'Topic already exists: </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">full_topic</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">warning</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">if</span> <span class="n">fail_if_exists</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">else</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error creating topic </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">full_topic</span><span class="p">),</span> <span class="n">e</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.delete_topic"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.delete_topic">[docs]</a> <span class="k">def</span> <span class="nf">delete_topic</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">,</span> <span class="n">fail_if_not_exists</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
+ <span class="sd">"""Deletes a Pub/Sub topic if it exists.</span>
+
+<span class="sd"> :param project: the GCP project ID in which to delete the topic</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param topic: the Pub/Sub topic name to delete; do not</span>
+<span class="sd"> include the ``projects/{project}/topics/`` prefix.</span>
+<span class="sd"> :type topic: string</span>
+<span class="sd"> :param fail_if_not_exists: if set, raise an exception if the topic</span>
+<span class="sd"> does not exist</span>
+<span class="sd"> :type fail_if_not_exists: bool</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_topic</span> <span class="o">=</span> <span class="n">_format_topic</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">topic</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">topics</span><span class="p">()</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span><span class="n">topic</span><span class="o">=</span><span class="n">full_topic</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="c1"># Status code 409 indicates that the topic was not found</span>
+ <span class="k">if</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">resp</span><span class="p">[</span><span class="s1">'status'</span><span class="p">])</span> <span class="o">==</span> <span class="s1">'404'</span><span class="p">:</span>
+ <span class="n">message</span> <span class="o">=</span> <span class="s1">'Topic does not exist: </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">full_topic</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">warning</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">if</span> <span class="n">fail_if_not_exists</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">else</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error deleting topic </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">full_topic</span><span class="p">),</span> <span class="n">e</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.create_subscription"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.create_subscription">[docs]</a> <span class="k">def</span> <span class="nf">create_subscription</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">topic_project</span><span class="p">,</span> <span class="n">topic</span><span class="p">,</span> <span class="n">subscription</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
+ <span class="n">subscription_project</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">ack_deadline_secs</span><span class="o">=</span><span class="mi">10</span><span class="p">,</span>
+ <span class="n">fail_if_exists</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
+ <span class="sd">"""Creates a Pub/Sub subscription, if it does not already exist.</span>
+
+<span class="sd"> :param topic_project: the GCP project ID of the topic that the</span>
+<span class="sd"> subscription will be bound to.</span>
+<span class="sd"> :type topic_project: string</span>
+<span class="sd"> :param topic: the Pub/Sub topic name that the subscription will be bound</span>
+<span class="sd"> to create; do not include the ``projects/{project}/subscriptions/``</span>
+<span class="sd"> prefix.</span>
+<span class="sd"> :type topic: string</span>
+<span class="sd"> :param subscription: the Pub/Sub subscription name. If empty, a random</span>
+<span class="sd"> name will be generated using the uuid module</span>
+<span class="sd"> :type subscription: string</span>
+<span class="sd"> :param subscription_project: the GCP project ID where the subscription</span>
+<span class="sd"> will be created. If unspecified, ``topic_project`` will be used.</span>
+<span class="sd"> :type subscription_project: string</span>
+<span class="sd"> :param ack_deadline_secs: Number of seconds that a subscriber has to</span>
+<span class="sd"> acknowledge each message pulled from the subscription</span>
+<span class="sd"> :type ack_deadline_secs: int</span>
+<span class="sd"> :param fail_if_exists: if set, raise an exception if the topic</span>
+<span class="sd"> already exists</span>
+<span class="sd"> :type fail_if_exists: bool</span>
+<span class="sd"> :return: subscription name which will be the system-generated value if</span>
+<span class="sd"> the ``subscription`` parameter is not supplied</span>
+<span class="sd"> :rtype: string</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_topic</span> <span class="o">=</span> <span class="n">_format_topic</span><span class="p">(</span><span class="n">topic_project</span><span class="p">,</span> <span class="n">topic</span><span class="p">)</span>
+ <span class="k">if</span> <span class="ow">not</span> <span class="n">subscription</span><span class="p">:</span>
+ <span class="n">subscription</span> <span class="o">=</span> <span class="s1">'sub-</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">uuid4</span><span class="p">())</span>
+ <span class="k">if</span> <span class="ow">not</span> <span class="n">subscription_project</span><span class="p">:</span>
+ <span class="n">subscription_project</span> <span class="o">=</span> <span class="n">topic_project</span>
+ <span class="n">full_subscription</span> <span class="o">=</span> <span class="n">_format_subscription</span><span class="p">(</span><span class="n">subscription_project</span><span class="p">,</span>
+ <span class="n">subscription</span><span class="p">)</span>
+ <span class="n">body</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="s1">'topic'</span><span class="p">:</span> <span class="n">full_topic</span><span class="p">,</span>
+ <span class="s1">'ackDeadlineSeconds'</span><span class="p">:</span> <span class="n">ack_deadline_secs</span>
+ <span class="p">}</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">subscriptions</span><span class="p">()</span><span class="o">.</span><span class="n">create</span><span class="p">(</span>
+ <span class="n">name</span><span class="o">=</span><span class="n">full_subscription</span><span class="p">,</span> <span class="n">body</span><span class="o">=</span><span class="n">body</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="c1"># Status code 409 indicates that the subscription already exists.</span>
+ <span class="k">if</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">resp</span><span class="p">[</span><span class="s1">'status'</span><span class="p">])</span> <span class="o">==</span> <span class="s1">'409'</span><span class="p">:</span>
+ <span class="n">message</span> <span class="o">=</span> <span class="s1">'Subscription already exists: </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">full_subscription</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">warning</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">if</span> <span class="n">fail_if_exists</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">else</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error creating subscription </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">full_subscription</span><span class="p">),</span>
+ <span class="n">e</span><span class="p">)</span>
+ <span class="k">return</span> <span class="n">subscription</span></div>
+
+<div class="viewcode-block" id="PubSubHook.delete_subscription"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.delete_subscription">[docs]</a> <span class="k">def</span> <span class="nf">delete_subscription</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">,</span>
+ <span class="n">fail_if_not_exists</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
+ <span class="sd">"""Deletes a Pub/Sub subscription, if it exists.</span>
+
+<span class="sd"> :param project: the GCP project ID where the subscription exists</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param subscription: the Pub/Sub subscription name to delete; do not</span>
+<span class="sd"> include the ``projects/{project}/subscriptions/`` prefix.</span>
+<span class="sd"> :type subscription: string</span>
+<span class="sd"> :param fail_if_not_exists: if set, raise an exception if the topic</span>
+<span class="sd"> does not exist</span>
+<span class="sd"> :type fail_if_not_exists: bool</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_subscription</span> <span class="o">=</span> <span class="n">_format_subscription</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">subscriptions</span><span class="p">()</span><span class="o">.</span><span class="n">delete</span><span class="p">(</span>
+ <span class="n">subscription</span><span class="o">=</span><span class="n">full_subscription</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="c1"># Status code 404 indicates that the subscription was not found</span>
+ <span class="k">if</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">resp</span><span class="p">[</span><span class="s1">'status'</span><span class="p">])</span> <span class="o">==</span> <span class="s1">'404'</span><span class="p">:</span>
+ <span class="n">message</span> <span class="o">=</span> <span class="s1">'Subscription does not exist: </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">full_subscription</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">warning</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">if</span> <span class="n">fail_if_not_exists</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span><span class="n">message</span><span class="p">)</span>
+ <span class="k">else</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error deleting subscription </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">full_subscription</span><span class="p">),</span>
+ <span class="n">e</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.pull"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.pull">[docs]</a> <span class="k">def</span> <span class="nf">pull</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">,</span> <span class="n">max_messages</span><span class="p">,</span>
+ <span class="n">return_immediately</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
+ <span class="sd">"""Pulls up to ``max_messages`` messages from Pub/Sub subscription.</span>
+
+<span class="sd"> :param project: the GCP project ID where the subscription exists</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param subscription: the Pub/Sub subscription name to pull from; do not</span>
+<span class="sd"> include the 'projects/{project}/topics/' prefix.</span>
+<span class="sd"> :type subscription: string</span>
+<span class="sd"> :param max_messages: The maximum number of messages to return from</span>
+<span class="sd"> the Pub/Sub API.</span>
+<span class="sd"> :type max_messages: int</span>
+<span class="sd"> :param return_immediately: If set, the Pub/Sub API will immediately</span>
+<span class="sd"> return if no messages are available. Otherwise, the request will</span>
+<span class="sd"> block for an undisclosed, but bounded period of time</span>
+<span class="sd"> :type return_immediately: bool</span>
+<span class="sd"> :return A list of Pub/Sub ReceivedMessage objects each containing</span>
+<span class="sd"> an ``ackId`` property and a ``message`` property, which includes</span>
+<span class="sd"> the base64-encoded message content. See</span>
+<span class="sd"> https://cloud.google.com/pubsub/docs/reference/rest/v1/\</span>
+<span class="sd"> projects.subscriptions/pull#ReceivedMessage</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_subscription</span> <span class="o">=</span> <span class="n">_format_subscription</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">)</span>
+ <span class="n">body</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="s1">'maxMessages'</span><span class="p">:</span> <span class="n">max_messages</span><span class="p">,</span>
+ <span class="s1">'returnImmediately'</span><span class="p">:</span> <span class="n">return_immediately</span>
+ <span class="p">}</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">response</span> <span class="o">=</span> <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">subscriptions</span><span class="p">()</span><span class="o">.</span><span class="n">pull</span><span class="p">(</span>
+ <span class="n">subscription</span><span class="o">=</span><span class="n">full_subscription</span><span class="p">,</span> <span class="n">body</span><span class="o">=</span><span class="n">body</span><span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">return</span> <span class="n">response</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'receivedMessages'</span><span class="p">,</span> <span class="p">[])</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error pulling messages from subscription </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">full_subscription</span><span class="p">),</span> <span class="n">e</span><span class="p">)</span></div>
+
+<div class="viewcode-block" id="PubSubHook.acknowledge"><a class="viewcode-back" href="../../../../code.html#airflow.contrib.hooks.gcp_pubsub_hook.PubSubHook.acknowledge">[docs]</a> <span class="k">def</span> <span class="nf">acknowledge</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">,</span> <span class="n">ack_ids</span><span class="p">):</span>
+ <span class="sd">"""Pulls up to ``max_messages`` messages from Pub/Sub subscription.</span>
+
+<span class="sd"> :param project: the GCP project name or ID in which to create</span>
+<span class="sd"> the topic</span>
+<span class="sd"> :type project: string</span>
+<span class="sd"> :param subscription: the Pub/Sub subscription name to delete; do not</span>
+<span class="sd"> include the 'projects/{project}/topics/' prefix.</span>
+<span class="sd"> :type subscription: string</span>
+<span class="sd"> :param ack_ids: List of ReceivedMessage ackIds from a previous pull</span>
+<span class="sd"> response</span>
+<span class="sd"> :type ack_ids: list</span>
+<span class="sd"> """</span>
+ <span class="n">service</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_conn</span><span class="p">()</span>
+ <span class="n">full_subscription</span> <span class="o">=</span> <span class="n">_format_subscription</span><span class="p">(</span><span class="n">project</span><span class="p">,</span> <span class="n">subscription</span><span class="p">)</span>
+ <span class="k">try</span><span class="p">:</span>
+ <span class="n">service</span><span class="o">.</span><span class="n">projects</span><span class="p">()</span><span class="o">.</span><span class="n">subscriptions</span><span class="p">()</span><span class="o">.</span><span class="n">acknowledge</span><span class="p">(</span>
+ <span class="n">subscription</span><span class="o">=</span><span class="n">full_subscription</span><span class="p">,</span> <span class="n">body</span><span class="o">=</span><span class="p">{</span><span class="s1">'ackIds'</span><span class="p">:</span> <span class="n">ack_ids</span><span class="p">}</span>
+ <span class="p">)</span><span class="o">.</span><span class="n">execute</span><span class="p">()</span>
+ <span class="k">except</span> <span class="n">errors</span><span class="o">.</span><span class="n">HttpError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
+ <span class="k">raise</span> <span class="n">PubSubException</span><span class="p">(</span>
+ <span class="s1">'Error acknowledging </span><span class="si">{}</span><span class="s1"> messages pulled from subscription </span><span class="si">{}</span><span class="s1">'</span>
+ <span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">ack_ids</span><span class="p">),</span> <span class="n">full_subscription</span><span class="p">),</span> <span class="n">e</span><span class="p">)</span></div></div>
+</pre></div>
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