The @aws-sdk/eventstream-codec npm package is designed to handle AWS event streams, providing utilities for encoding and decoding messages in the event stream format used by AWS services. This package is particularly useful when working with AWS services that utilize event streams for real-time data processing.

What are @aws-sdk/eventstream-codec's main functionalities?

Encoding messages

This feature allows you to encode messages into the AWS event stream format. The `marshall` function takes a message object with headers and a body and returns a Buffer of the encoded message.

const { marshall } = require('@aws-sdk/eventstream-codec');
const message = {
  headers: {
    ':message-type': {
      type: 'string',
      value: 'event'
    },
    ':event-type': {
      type: 'string',
      value: 'Records'
    }
  },
  body: Buffer.from('Hello, this is a test message')
};
const encodedMessage = marshall(message);

Decoding messages

This feature enables the decoding of messages from the AWS event stream format. The `unmarshall` function takes a Buffer of an encoded message and returns an object representing the decoded message, including headers and body.

const { unmarshall } = require('@aws-sdk/eventstream-codec');
const encodedMessage = Buffer.from(/* previously encoded message */);
const decodedMessage = unmarshall(encodedMessage);
console.log(decodedMessage);

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Changelog

Source

3.208.0 (2022-11-10)

Bug Fixes

aws-client-api-test: rename package (#4165) (2e13b67)
types: add client config interface test with s3 example (#4156) (7811cd9)

Features

client-ec2: This release adds a new price capacity optimized allocation strategy for Spot Instances to help customers optimize provisioning of Spot Instances via EC2 Auto Scaling, EC2 Fleet, and Spot Fleet. It allocates Spot Instances based on both spare capacity availability and Spot Instance price. (6f4d604)
client-ecs: This release adds support for task scale-in protection with updateTaskProtection and getTaskProtection APIs. UpdateTaskProtection API can be used to protect a service managed task from being terminated by scale-in events and getTaskProtection API to get the scale-in protection status of a task. (a5eede0)
client-elasticsearch-service: Amazon OpenSearch Service now offers managed VPC endpoints to connect to your Amazon OpenSearch Service VPC-enabled domain in a Virtual Private Cloud (VPC). This feature allows you to privately access OpenSearch Service domain without using public IPs or requiring traffic to traverse the Internet. (f36b021)
client-scheduler: AWS introduces the new Amazon EventBridge Scheduler. EventBridge Scheduler is a serverless scheduler that allows you to create, run, and manage tasks from one central, managed service. (8829f71)
clients: update client endpoints as of 2022-11-10 (c01499d)
private: add server artifacts (#4159) (e70f472)

Readme

Source

@aws-sdk/eventstream-codec

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Last updated on 10 Nov 2022

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