
<p>
  GCP Pub/Sub is managed messaging service provide by GCP, this blog demo how to
  create Pub/Sub and use dataflow to subscribe data into BigQuery.
</p>
<h2>Create BQ Table for test</h2>
<p>
  <span style="font-weight: 400"
    >First, need to create a BQ table, so we can store our message from Pub/Sub
    we send, below is the JSON and BQ Table assume we want to store the
    information.</span
  >
</p>
<p>
  <code
    ><span style="font-weight: 400"
      >{&ldquo;id&rdquo;: 100, &ldquo;name&rdquo;:&rdquo;Smith James",
      url:&rdquo;</span
    ><a href="about:blank"
      ><span style="font-weight: 400"
        >https://testsmithjames.com&rdquo;,&rdquo;age&rdquo;:30,&rdquo;price&rdquo;:300,&rdquo;desc&rdquo;:&rdquo;I
        like sell my arts.</span
      ></a
    ><span style="font-weight: 400">&rdquo;}</span></code
  >
</p>
<h2><span style="font-weight: 400">PubSub Topic</span></h2>
<p>
  <span style="font-weight: 400"
    >Here, we try to create a topic via gcloud command line,&nbsp;</span
  >
</p>
<p class="p1"><span class="s1">To create a PubSub Topic</span></p>
<p class="p1">
  <code
    ><span class="s1">gcloud pubsub topics create test_topic_myname</span></code
  >
</p>
<p class="p1">
  <span class="s1"
    >In case, need to delete the topic, below command is how to delete a PubSub
    Topic</span
  >
</p>
<p class="p1">
  <code
    ><span class="s1">gcloud pubsub topics delete test_topic_myname</span></code
  >
</p>
<h2>Create a Dataflow</h2>
<p>
  Now, the following command example will create a dataflow job by using the
  template PubSub to BigQuery and will insert the new record to the Big Query
  table defined.
</p>
<p>This command also expects the cloud bucket already exists.</p>
<pre
  class="language-bash"
><code>gcloud dataflow jobs run ps-to-bq-test-topic-myname --gcs-location gs://dataflow-templates-us-central1/latest/PubSub_to_BigQuery --region us-central1 --staging-location gs://test-pubsub-name-topic/temp --parameters inputTopic=projects/test-dataflow-sql/topics/test_topic_myname,outputTableSpec=test-dataflow-sql:dataflow_sql_tutorial.test_pubsub_to_bq</code></pre>
<h2 class="p1"><span class="s1">Manually Publish PubSub Message</span></h2>
<p>
  <span class="s1"
    >Let's test the PubSub Dataflow to BigQuery, go to the GCP Pub/Sub page, and
    paste the below Json, once click the publish button should see the new
    record in BigQuery table.</span
  ><span class="s1"></span>
</p>
<pre class="language-markup"><code>{
  "id": 100,
  "name": "smith james",
  "url": "https://testsmithjames.com",
  "age": 30,
  "price": 300,
  "desc": "I like sell my arts"
}</code></pre>
<h2>Send Pub/Sub Message from C#</h2>
<p>
  Following is a sample code by using C# to send a message to the projecId and
  topicId.
</p>
<pre
  class="language-csharp"
><code>TopicName topicName = TopicName.FromProjectTopic(ProjectId, TopicId);

PublisherClient publisher = await PublisherClient.CreateAsync(topicName);

SamplePubSubModel sampleModel = new()
{
                id = 304,
                name = "my name",
                url = "https://test-url",
                age = 40,
                price = 300,
                desc = "some desc"
};

await publisher.PublishAsync(JsonConvert.SerializeObject(sampleModel));</code></pre>
<p>
  Above C# code require the Google.Cloud.PubSub.V1, but also need to
  authenticate then the code will successfully run.
</p>
<h2>Authenticating as a service account</h2>
<p>
  Now, just run the C# code above, and you'll see the exception which requires
  providing the google credentials. There're a few ways to achieve this, what
  we're doing here is trying to create a service account that has permission to
  pub/sub message.
</p>
<p>
  Once create a service account, make sure has the Role
  <code>Pub/Sub Publisher</code>.
</p>
<p>
  Create a token and save the credential JSON file to the local, if you're using
  windows, run the below command. Now, after following the below command, might
  still see the credential error but, it might be fixed after restarting the
  windows.
</p>
<p><code>set GOOGLE_APPLICATION_CREDENTIALS=key_path</code></p>
<h2>Conclusion</h2>
<p>
  Should be very easy to set up all processes, but might take some time on how
  the google application credentials especially if you're using windows.
</p>
<p></p>


GCP Pub/Sub is managed messaging service provide by GCP, this blog demo how to create Pub/Sub and use dataflow to subscribe datainto BigQuery.

Category BigQuery

PubSub to BigQuery via Dataflow with GCP