@aws-sdk/middleware-eventstream is a middleware package for the AWS SDK for JavaScript. It provides functionality to handle event streams, which are used in various AWS services to deliver real-time data. This package is essential for working with services that use event streams, such as AWS Transcribe, AWS Kinesis, and others.

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

Event Stream Handling

This feature allows you to handle event streams by marshalling data into the event stream format. The code sample demonstrates how to create an event stream using the EventStreamMarshaller.

const { EventStreamMarshaller } = require('@aws-sdk/middleware-eventstream');

const marshaller = new EventStreamMarshaller();

const eventStream = marshaller.marshall({
  headers: {},
  body: Buffer.from('example event data')
});

console.log(eventStream);

Event Stream Unmarshalling

This feature allows you to unmarshall event streams back into their original data format. The code sample demonstrates how to unmarshall an event stream using the EventStreamMarshaller.

const { EventStreamMarshaller } = require('@aws-sdk/middleware-eventstream');

const marshaller = new EventStreamMarshaller();

const eventStream = Buffer.from('example event stream');
const event = marshaller.unmarshall(eventStream);

console.log(event);

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Changelog

Source

3.1.0 (2020-12-23)

Bug Fixes

clients: default region and credential provider (#1834) (bc79ab5)
clients: populate sdkId in serviceId and default to use arnNamespace as signingName (#1786) (0011af2)
clients: remove retry headers for several services (#1789) (fc98d2d)
clients: update endpoint provider (#1824) (64d2210)
clients: use signing name from auth sigv4 trait (#1835) (e539302)
codegen: strip names from enums (#1837) (0711503)
lib-storage: cleanup stream listeners to prevent memory leak (3d36682)
middleware-user-agent: add middleware to final step of build (#1833) (e7dce39)
signature-v4: add secrets to signing key cache key (#1776) (8785ad4)
util-waiter: fix compiling error with waiter (#1812) (ca1f0d6), closes #1803
log requestId, extendedRequestId, cfId in $metadata (#1819) (f2a47e8)

Features

credential-provider-node: use credential_process from profile (#1773) (842e2a0), closes #1772
standardize user agent value (#1775) (388b180)
cucumber: use waiters in integration tests (#1792) (e151aee)
middleware-logger: log clientName, commandName, input, output (#1788) (4f9e56f)

Readme

Source

@aws-sdk/middleware-eventstream

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Last updated on 24 Dec 2020

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