@aws-sdk/client-auto-scaling

Description

AWS SDK for JavaScript AutoScaling Client for Node.js, Browser and React Native.

Amazon EC2 Auto Scaling

The DescribeAutoScalingGroups API operation might be throttled when retrieving details for an Auto Scaling group that contains many instances. By default, this operation returns details for all instances in the group. To help prevent throttling, you can set the IncludeInstances parameter to false to exclude instance details from the response.

Amazon EC2 Auto Scaling is designed to automatically launch and terminate EC2 instances based on user-defined scaling policies, scheduled actions, and health checks.

For more information, see the Amazon EC2 Auto Scaling User Guide and the Amazon EC2 Auto Scaling API Reference.

Installing

To install this package, use the CLI of your favorite package manager:

• npm install @aws-sdk/client-auto-scaling
• yarn add @aws-sdk/client-auto-scaling
• pnpm add @aws-sdk/client-auto-scaling

Getting Started

Import

The AWS SDK is modulized by clients and commands. To send a request, you only need to import the AutoScalingClient and the commands you need, for example DescribePoliciesCommand:

// ES5 example
const { AutoScalingClient, DescribePoliciesCommand } = require("@aws-sdk/client-auto-scaling");

// ES6+ example
import { AutoScalingClient, DescribePoliciesCommand } from "@aws-sdk/client-auto-scaling";

Usage

To send a request:

• Instantiate a client with configuration (e.g. credentials, region).
  • See docs/CLIENTS for configuration details.
  • See @aws-sdk/config for additional options.
• Instantiate a command with input parameters.
• Call the send operation on the client, providing the command object as input.

const client = new AutoScalingClient({ region: "REGION" });

const params = { /** input parameters */ };
const command = new DescribePoliciesCommand(params);

Async/await

We recommend using the await operator to wait for the promise returned by send operation as follows:

// async/await.
try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  // error handling.
} finally {
  // finally.
}

Promises

You can also use Promise chaining.

client
  .send(command)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  })
  .finally(() => {
    // finally.
  });

Aggregated client

The aggregated client class is exported from the same package, but without the "Client" suffix.

AutoScaling extends AutoScalingClient and additionally supports all operations, waiters, and paginators as methods. This style may be familiar to you from the AWS SDK for JavaScript v2.

If you are bundling the AWS SDK, we recommend using only the bare-bones client (AutoScalingClient). More details are in the blog post on modular packages in AWS SDK for JavaScript.

import { AutoScaling } from "@aws-sdk/client-auto-scaling";

const client = new AutoScaling({ region: "REGION" });

// async/await.
try {
  const data = await client.describePolicies(params);
  // process data.
} catch (error) {
  // error handling.
}

// Promises.
client
  .describePolicies(params)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  });

// callbacks (not recommended).
client.describePolicies(params, (err, data) => {
  // process err and data.
});

Troubleshooting

When the service returns an exception, the error will include the exception information, as well as response metadata (e.g. request id).

try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  const { requestId, cfId, extendedRequestId } = error.$metadata;
  console.log({ requestId, cfId, extendedRequestId });
  /**
   * The keys within exceptions are also parsed.
   * You can access them by specifying exception names:
   * if (error.name === 'SomeServiceException') {
   *     const value = error.specialKeyInException;
   * }
   */
}

See also docs/ERROR_HANDLING.

Getting Help

Please use these community resources for getting help. We use GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.

• Visit the Developer Guide or API Reference.
• Check out the blog posts tagged with aws-sdk-js on AWS Developer Blog.
• Ask a question on StackOverflow and tag it with aws-sdk-js.
• Join the AWS JavaScript community on gitter.
• If it turns out that you may have found a bug, please open an issue.

To test your universal JavaScript code in Node.js, browser and react-native environments, visit our code samples repo.

Contributing

This client code is generated automatically. Any modifications will be overwritten the next time the @aws-sdk/client-auto-scaling package is updated. To contribute to client you can check our generate clients scripts.

License

This SDK is distributed under the Apache License, Version 2.0, see LICENSE for more information.

Client Commands (Operations List)