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@aws-sdk/util-waiter

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@aws-sdk/util-waiter

Shared utilities for client waiters for the AWS SDK

  • 3.374.0
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What is @aws-sdk/util-waiter?

@aws-sdk/util-waiter is a utility package in the AWS SDK for JavaScript that provides functionality to wait for a resource to reach a desired state. This is particularly useful for operations that are asynchronous and may take some time to complete, such as creating or deleting AWS resources.

What are @aws-sdk/util-waiter's main functionalities?

Wait for a resource to reach a desired state

This feature allows you to wait until a DynamoDB table exists. The `waitUntilTableExists` function polls the `DescribeTableCommand` until the table reaches the 'ACTIVE' state or the maximum wait time is reached.

const { DynamoDBClient, DescribeTableCommand } = require('@aws-sdk/client-dynamodb');
const { waitUntilTableExists } = require('@aws-sdk/util-waiter');

const client = new DynamoDBClient({ region: 'us-west-2' });
const params = { TableName: 'my-table' };

const run = async () => {
  try {
    const result = await waitUntilTableExists({ client, maxWaitTime: 300 }, { TableName: 'my-table' });
    console.log('Table exists:', result);
  } catch (error) {
    console.error('Error waiting for table to exist:', error);
  }
};

run();

Custom waiters

This feature allows you to create custom waiters for any AWS resource. In this example, a custom waiter is created to wait until an EC2 instance is in the 'running' state.

const { EC2Client, DescribeInstancesCommand } = require('@aws-sdk/client-ec2');
const { createWaiter, WaiterState } = require('@aws-sdk/util-waiter');

const client = new EC2Client({ region: 'us-west-2' });

const checkInstanceRunning = async () => {
  const command = new DescribeInstancesCommand({ InstanceIds: ['i-1234567890abcdef0'] });
  const result = await client.send(command);
  const instance = result.Reservations[0].Instances[0];
  return instance.State.Name === 'running' ? { state: WaiterState.SUCCESS } : { state: WaiterState.RETRY };
};

const run = async () => {
  try {
    const result = await createWaiter({ client, maxWaitTime: 300 }, checkInstanceRunning);
    console.log('Instance is running:', result);
  } catch (error) {
    console.error('Error waiting for instance to run:', error);
  }
};

run();

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Package last updated on 20 Jul 2023

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