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lambda-stream
Advanced tools
This library adds types and local support for AWS Lambda Response Streaming. Locally, it'll buffer and return the entire response.
In AWS Lambda, it'll simply use the global awslambda.streamifyResponse
.
This library exposes a ResponseStream
class, the streamifyResponse
method, and isInAWS
method. Types are also included.
AWS added Lambda Response Streaming directly into the NodeJS runtime as a global method, instead of providing it with the AWS-SDK.
This makes functions leveraging Lambda Response Streaming difficult to test, run locally, or even write Lambda functions using a typical editor. Magic, runtime-only methods are a drag on developer experience!
So I wrote this library to fill that gap
This library shouldn't exist.
If or when AWS decides to release and support a library which makes AWS Lambda Streaming Responses usable and testable locally, I'll happily archive this project.
Works like this:
import { APIGatewayProxyEvent } from 'aws-lambda'
import { streamifyResponse, ResponseStream } from 'lambda-stream'
export const handler = streamifyResponse(myHandler)
async function myHandler(
event: APIGatewayProxyEvent,
responseStream: ResponseStream
): Promise<void> {
console.log('Handler got event:', event)
responseStream.setContentType('text/plain')
responseStream.write('Hello, world!')
responseStream.end()
}
Or in commonjs:
'use strict'
const { streamifyResponse } = require('lambda-stream')
module.exports.hello = streamifyResponse(
async (event, responseStream, context) => {
responseStream.setContentType('text/plain')
responseStream.write('Hello, world!')
responseStream.end()
}
)
Pipelining is also supported:
const pipeline = require('util').promisify(require('stream').pipeline)
const { Readable } = require('stream')
const { streamifyResponse } = require('lambda-stream')
const handler = async (event, responseStream, _context) => {
// As an example, convert event to a readable stream.
requestStream = Readable.from(Buffer.from(JSON.stringify({ hello: 'world' })))
await pipeline(requestStream, zlib.createGzip(), responseStream)
}
module.exports.gzip = streamifyResponse(handler)
FAQs
awslambda.streamifyResponse, but locally and with typescript
We found that lambda-stream demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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