Use the automation api to do canary deployment of a stack in a new region, waiting for traffic before tearing down old stack

To achieve a canary deployment of a stack in a new region using the Pulumi Automation API, you can follow these steps:

Define the infrastructure for both the old and new stacks.
Deploy the new stack in the new region.
Gradually shift traffic to the new stack.
Monitor the new stack to ensure it is receiving traffic correctly.
Tear down the old stack once the new stack is validated.

Below is a TypeScript program that demonstrates how to use the Pulumi Automation API to perform a canary deployment:

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";
import * as automation from "@pulumi/pulumi/x/automation";

// Define the old stack configuration
const oldStackConfig = {
    region: "us-west-2",
    stackName: "old-stack",
};

// Define the new stack configuration
const newStackConfig = {
    region: "us-east-1",
    stackName: "new-stack",
};

// Define the infrastructure for the old stack
const oldStackInfra = async () => {
    const bucket = new aws.s3.Bucket("oldBucket", {
        acl: "private",
    });

    return {
        bucketName: bucket.bucket,
    };
};

// Define the infrastructure for the new stack
const newStackInfra = async () => {
    const bucket = new aws.s3.Bucket("newBucket", {
        acl: "private",
    });

    return {
        bucketName: bucket.bucket,
    };
};

// Deploy the new stack
const deployNewStack = async () => {
    const newStack = await automation.LocalWorkspace.createOrSelectStack({
        stackName: newStackConfig.stackName,
        projectName: "canary-deployment",
        program: newStackInfra,
    });

    await newStack.setConfig("aws:region", { value: newStackConfig.region });
    await newStack.up();
};

// Shift traffic to the new stack
const shiftTraffic = async () => {
    // Implement traffic shifting logic here
    // For example, update DNS records or load balancer settings
};

// Monitor the new stack
const monitorNewStack = async () => {
    // Implement monitoring logic here
    // Ensure the new stack is receiving traffic correctly
};

// Tear down the old stack
const tearDownOldStack = async () => {
    const oldStack = await automation.LocalWorkspace.createOrSelectStack({
        stackName: oldStackConfig.stackName,
        projectName: "canary-deployment",
        program: oldStackInfra,
    });

    await oldStack.destroy();
};

// Main deployment logic
const main = async () => {
    await deployNewStack();
    await shiftTraffic();
    await monitorNewStack();
    await tearDownOldStack();
};

main().catch(err => console.error(err));

In this program:

We define the infrastructure for both the old and new stacks.
We deploy the new stack in the new region.
We shift traffic to the new stack (you will need to implement the traffic shifting logic based on your requirements).
We monitor the new stack to ensure it is receiving traffic correctly.
We tear down the old stack once the new stack is validated.