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

3.306.0 (2023-04-04)

Bug Fixes

types: node-http-handler type imports and @aws-sdk/types exports (#4610) (8ee06d4)

Features

client-amplifyuibuilder: Support StorageField and custom displays for data-bound options in form builder. Support non-string operands for predicates in collections. Support choosing client to get token from. (b24e527)
client-dataexchange: This release updates the value of MaxResults. (b795ebc)
client-ec2: C6in, M6in, M6idn, R6in and R6idn bare metal instances are powered by 3rd Generation Intel Xeon Scalable processors and offer up to 200 Gbps of network bandwidth. (01bddbc)
client-elastic-inference: Updated public documentation for the Describe and Tagging APIs. (e28258e)
client-rekognitionstreaming: update model (#4609) (ddb0c5d)
client-sagemaker-runtime: Amazon SageMaker Asynchronous Inference now provides customers a FailureLocation as a response parameter in InvokeEndpointAsync API to capture the model failure responses. (62f9c4d)
client-sagemaker: Amazon SageMaker Asynchronous Inference now allows customer's to receive failure model responses in S3 and receive success/failure model responses in SNS notifications. (bbc2fd1)
client-wafv2: This release rolls back association config feature for webACLs that protect CloudFront protections. (f96b649)
clients: update client endpoints as of 2023-04-04 (597085d)

Readme

Source

@aws-sdk/eventstream-codec

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Last updated on 04 Apr 2023

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