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

3.200.0 (2022-10-31)

Bug Fixes

endpoint: instruct rds middleware to wait for endpoint resolution (#4120) (7cabc1e)
types: extends check of generic in WithSdkStreamMixin (#4119) (299d245)

Features

client-apprunner: This release adds support for private App Runner services. Services may now be configured to be made private and only accessible from a VPC. The changes include a new VpcIngressConnection resource and several new and modified APIs. (cce87ac)
client-cloudwatch-logs: SDK release to support tagging for destinations and log groups with TagResource. Also supports tag on create with PutDestination. (c97217f)
client-connect: Amazon connect now support a new API DismissUserContact to dismiss or remove terminated contacts in Agent CCP (9e340c3)
client-ec2: Elastic IP transfer is a new Amazon VPC feature that allows you to transfer your Elastic IP addresses from one AWS Account to another. (dba90b0)
client-iot: This release adds the Amazon Location action to IoT Rules Engine. (dc1adcf)
client-sesv2: This release includes support for interacting with the Virtual Deliverability Manager, allowing you to opt in/out of the feature and to retrieve recommendations and metric data. (72ea473)
client-textract: This release introduces additional support for 30+ normalized fields such as vendor address and currency. It also includes OCR output in the response and accuracy improvements for the already supported fields in previous version (5ee0634)
clients: update client endpoints as of 2022-10-31 (1677e7f)

Readme

Source

@aws-sdk/eventstream-codec

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Last updated on 31 Oct 2022

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