fastify-reply-from with transform stream

Hello
Could someone explain to me why this does not work?
- 'use strict'
- const {Transform, Readable} = require('stream');
- const createTransformStream = () => {
- new Transform({
- transform(chunk, enc, next) {
- const uppercase = chunk.toString().toUpperCase();
- next(null, uppercase);
- }
- })
- }
- const uppercaseStream = createTransformStream();
- module.exports = async function (fastify, opts) {
- fastify.get('/', async function (request, reply) {
- const { url } = request.query;
- try {
- new URL(url)
- } catch (error) {
- throw fastify.httpErrors.badRequest()
- }
- await reply.from(url, {
- onResponse(req, reply, response) {
- reply.send(response.pipe(uppercaseStream));
- }
- });
- })
- }
Thanks
Comments
-
I forgot to return the Transform
- 'use strict'
- const {Transform, Readable} = require('stream');
- const createTransformStream = () => {
- return new Transform({
- transform(chunk, enc, next) {
- const uppercase = chunk.toString().toUpperCase();
- next(null, uppercase);
- }
- })
- }
- const uppercaseStream = createTransformStream();
- module.exports = async function (fastify, opts) {
- fastify.get('/', async function (request, reply) {
- const { url } = request.query;
- try {
- new URL(url)
- } catch (error) {
- throw fastify.httpErrors.badRequest()
- }
- await reply.from(url, {
- onResponse(req, reply, response) {
- reply.send(response.pipe(uppercaseStream));
- }
- });
- })
- }
0 -
nice catch @arturo.miguel.next
0 -
I wrote the code differently, but in all ways, the GET request from the client hangs forever.
However, sending the reply without any transformationreturn reply.from(url)
works as expected.the command
curl http://localhost:3000/?url=http://localhost:5050
from inside the server does not return any response either.any1 have an idea, why it's not working with me?
Thanks a lothere are two examples where the GET request is stuck forever:
- 'use strict'
- const { Transform, pipeline } = require('stream')
- function upper() {
- return new Transform({
- transform(chunk, encoding, callback) {
- callback(null, chunk.toString().toUpperCase())
- }
- })
- }
- module.exports = async function (fastify, opts) {
- fastify.get('/', async function (request, reply) {
- const { url } = request.query
- try {
- new URL(url)
- } catch (err) {
- throw fastify.httpErrors.badRequest()
- }
- console.log('Fetching from URL:', url)
- return reply.from(url, {
- onResponse (request, reply, res) {
- console.log('Received response from upstream URL')
- pipeline(res, upper(), reply.raw,
- (err) => {
- if (err) {
- console.error('Pipeline failed:', err)
- reply.code(500).send({ error: 'Internal Server Error' })
- } else {
- console.log('Pipeline succeeded')
- }
- }
- )
- }
- })
- })
- }
The original code as in the course also beating the same with me:
- 'use strict'
- const { Readable } = require('stream')
- async function * upper (res) {
- for await (const chunk of res) {
- yield chunk.toString().toUpperCase()
- }
- }
- module.exports = async function (fastify, opts) {
- fastify.get('/', async function (request, reply) {
- const { url } = request.query
- try {
- new URL(url)
- } catch (err) {
- throw fastify.httpErrors.badRequest()
- }
- return reply.from(url, {
- onResponse (request, reply, res) {
- reply.send(Readable.from(upper(res)))
- }
- })
- })
- }
0 -
for the bellow code, I get an error message "res is not async iterable"
- 'use strict'
- const { Readable } = require('stream')
- async function * upper (res) {
- for await (const chunk of res) {
- yield chunk.toString().toUpperCase()
- }
- }
- module.exports = async function (fastify, opts) {
- fastify.get('/', async function (request, reply) {
- const { url } = request.query
- try {
- new URL(url)
- } catch (err) {
- throw fastify.httpErrors.badRequest()
- }
- return reply.from(url, {
- onResponse (request, reply, res) {
- reply.send(Readable.from(upper(res)))
- }
- })
- })
- }
0 -
It should be
reply.send(Readable.from(upper(res.stream)))
, probably the plugin has changed and the stream is part or res.0
Categories
- All Categories
- 153 LFX Mentorship
- 153 LFX Mentorship: Linux Kernel
- 839 Linux Foundation IT Professional Programs
- 383 Cloud Engineer IT Professional Program
- 185 Advanced Cloud Engineer IT Professional Program
- 86 DevOps Engineer IT Professional Program
- 154 Cloud Native Developer IT Professional Program
- 151 Express Training Courses & Microlearning
- 149 Express Courses - Discussion Forum
- 2 Microlearning - Discussion Forum
- 6.9K Training Courses
- 49 LFC110 Class Forum - Discontinued
- 74 LFC131 Class Forum
- 55 LFD102 Class Forum
- 248 LFD103 Class Forum
- 25 LFD110 Class Forum
- 49 LFD121 Class Forum
- 2 LFD123 Class Forum
- 1 LFD125 Class Forum
- 19 LFD133 Class Forum
- 10 LFD134 Class Forum
- 19 LFD137 Class Forum
- 1 LFD140 Class Forum
- 73 LFD201 Class Forum
- 8 LFD210 Class Forum
- 6 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 3 LFD233 Class Forum
- 5 LFD237 Class Forum
- 25 LFD254 Class Forum
- 733 LFD259 Class Forum
- 111 LFD272 Class Forum - Discontinued
- 4 LFD272-JP クラス フォーラム - Discontinued
- 15 LFD273 Class Forum
- 354 LFS101 Class Forum
- 3 LFS111 Class Forum
- 4 LFS112 Class Forum
- 4 LFS116 Class Forum
- 9 LFS118 Class Forum
- 2 LFS120 Class Forum
- 11 LFS142 Class Forum
- 9 LFS144 Class Forum
- 5 LFS145 Class Forum
- 6 LFS146 Class Forum
- 5 LFS147 Class Forum
- 20 LFS148 Class Forum
- 17 LFS151 Class Forum
- 6 LFS157 Class Forum
- 78 LFS158 Class Forum
- 1 LFS158-JP クラス フォーラム
- 13 LFS162 Class Forum
- 2 LFS166 Class Forum - Discontinued
- 8 LFS167 Class Forum
- 4 LFS170 Class Forum
- 2 LFS171 Class Forum - Discontinued
- 4 LFS178 Class Forum - Discontinued
- 4 LFS180 Class Forum
- 3 LFS182 Class Forum
- 6 LFS183 Class Forum
- 1 LFS184 Class Forum
- 36 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 3 LFS201-JP クラス フォーラム - Discontinued
- 22 LFS203 Class Forum
- 141 LFS207 Class Forum
- 3 LFS207-DE-Klassenforum
- 3 LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum - Discontinued
- 56 LFS216 Class Forum - Discontinued
- 58 LFS241 Class Forum
- 51 LFS242 Class Forum
- 39 LFS243 Class Forum
- 17 LFS244 Class Forum
- 7 LFS245 Class Forum
- 1 LFS246 Class Forum
- 1 LFS248 Class Forum
- 120 LFS250 Class Forum
- 3 LFS250-JP クラス フォーラム
- 2 LFS251 Class Forum
- 160 LFS253 Class Forum
- 1 LFS254 Class Forum - Discontinued
- 3 LFS255 Class Forum
- 14 LFS256 Class Forum
- 2 LFS257 Class Forum
- 1.3K LFS258 Class Forum
- 12 LFS258-JP クラス フォーラム
- 139 LFS260 Class Forum
- 165 LFS261 Class Forum
- 44 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 25 LFS267 Class Forum
- 26 LFS268 Class Forum
- 38 LFS269 Class Forum
- 11 LFS270 Class Forum
- 202 LFS272 Class Forum - Discontinued
- 2 LFS272-JP クラス フォーラム - Discontinued
- 2 LFS274 Class Forum - Discontinued
- 4 LFS281 Class Forum - Discontinued
- 30 LFW111 Class Forum
- 263 LFW211 Class Forum
- 187 LFW212 Class Forum
- 16 SKF100 Class Forum
- 2 SKF200 Class Forum
- 3 SKF201 Class Forum
- 799 Hardware
- 200 Drivers
- 68 I/O Devices
- 37 Monitors
- 104 Multimedia
- 175 Networking
- 91 Printers & Scanners
- 85 Storage
- 763 Linux Distributions
- 82 Debian
- 67 Fedora
- 18 Linux Mint
- 13 Mageia
- 23 openSUSE
- 149 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 356 Ubuntu
- 472 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 96 Linux Security
- 78 Network Management
- 102 System Management
- 48 Web Management
- 71 Mobile Computing
- 19 Android
- 39 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 382 Off Topic
- 116 Introductions
- 178 Small Talk
- 27 Study Material
- 814 Programming and Development
- 307 Kernel Development
- 489 Software Development
- 1.8K Software
- 263 Applications
- 183 Command Line
- 4 Compiling/Installing
- 988 Games
- 317 Installation
- 106 All In Program
- 106 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)