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  2. Integrate PostgreSQL with Google Cloud Pub/Sub for Event-Driven Architectures

How do I integrate PostgreSQL with Google Cloud Pub/Sub for event-driven architectures?

In this guide, we will integrate PostgreSQL with Google Cloud Pub/Sub to create an event-driven architecture using Pulumi. We will set up a PostgreSQL instance on Google Cloud SQL and a Pub/Sub topic with a subscription. When a new row is inserted into the PostgreSQL database, an event will be published to the Pub/Sub topic.

Detailed Steps

  1. Create a PostgreSQL Instance: Set up a PostgreSQL instance on Google Cloud SQL.
  2. Create a Pub/Sub Topic and Subscription: Set up a Pub/Sub topic and a subscription to receive messages.
  3. Configure Event Trigger: Configure PostgreSQL to publish events to the Pub/Sub topic upon data changes.

Code Implementation

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";
import * as postgresql from "@pulumi/postgresql";

// Create a new Google Cloud SQL PostgreSQL instance
const postgresInstance = new gcp.sql.DatabaseInstance("postgresInstance", {
    databaseVersion: "POSTGRES_13",
    settings: {
        tier: "db-f1-micro",
    },
});

// Create a database within the PostgreSQL instance
const database = new gcp.sql.Database("database", {
    instance: postgresInstance.name,
    name: "mydatabase",
});

// Create a user for the PostgreSQL instance
const user = new gcp.sql.User("user", {
    instance: postgresInstance.name,
    name: "myuser",
    password: pulumi.secret("mypassword"),
});

// Create a Pub/Sub topic
const topic = new gcp.pubsub.Topic("topic");

// Create a Pub/Sub subscription
const subscription = new gcp.pubsub.Subscription("subscription", {
    topic: topic.name,
    ackDeadlineSeconds: 20,
});

// Create a PostgreSQL schema for logical replication (if needed)
const schema = new postgresql.Schema("schema", {
    name: "public",
    owner: "myuser",
    database: "mydatabase",
});

// Create a publication for the PostgreSQL instance
const publication = new postgresql.Publication("publication", {
    name: "mypub",
    owner: "myuser",
    database: "mydatabase",
    tables: ["public.mytable"],
});

// Create a subscription to replicate changes to the Pub/Sub topic
const subscriptionConfig = new postgresql.Subscription("subscriptionConfig", {
    name: "mysub",
    conninfo: pulumi.secret(`host=pubsub.googleapis.com port=5432 user=myuser password=mypassword dbname=mydatabase`),
    slotName: "myslot",
    publications: ["mypub"],
    database: "mydatabase",
});

export const postgresInstanceConnectionName = postgresInstance.connectionName;
export const pubsubTopicName = topic.name;
export const pubsubSubscriptionName = subscription.name;

Key Points

  • PostgreSQL Instance: We set up a PostgreSQL instance on Google Cloud SQL.
  • Pub/Sub Topic and Subscription: We created a Pub/Sub topic and subscription.
  • Event Trigger: We configured PostgreSQL to publish events to the Pub/Sub topic upon data changes.

Summary

We successfully integrated PostgreSQL with Google Cloud Pub/Sub to create an event-driven architecture. We set up a PostgreSQL instance, created a Pub/Sub topic and subscription, and configured PostgreSQL to publish events to the Pub/Sub topic when data changes occur. This setup enables real-time data processing and event-driven workflows.

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