VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

Here is a scenario of cyclic sending messages and receiving responses via slowStatsChannel.
The transport accepts all 5 responses, but only the first 3 responses that meet the 10s interval are displayed on the console, as seen in DevTools.
My understanding is that a packet transaction has a lifetime, after which the packets are accepted but are not passed to the processing script. This is a tricky disconcerting point for those who are new to real-time network programming.

1 comment

/book-real-time-phoenix #suggestion

0 445 1

2023-01-05 15:06:11 UTC

First Post!

sb8244

Author of From Ruby to Elixir and Real-Time Phoenix

Just to clarify, do you mean this lifetime is implemented in Phoenix JS lib, or somewhere else?

The packets transmitted over the channel’s WebSocket are not delayed at all. It’s the request/response lifecycle that’s delayed inside of the Channel’s logic (via Process.sleep). So, when a message is sent, it’s going to be sent as fast as possible from client → server and server → client.

WebSocket itself does not have the concept of request/response lifecycle, so that’s all implemented by Phoenix’s libraries.

Post #2

Where Next?

View thread on forum

View Real Time Phoenix's book portal

Post errata for this book

Post a suggestion for this book

Post a question about this book

Post a review about this book

Home PragProg Customers

/book-real-time-phoenix #suggestion

0 445 1

Last post

Popular Pragmatic Bookshelf topics

PragProg Customers

Warnings in Python Testing With Pytest Chapter 2

Python Testing With Pytest - Chapter 2, warnings for “unregistered custom marks” While running the smoke tests in Chapter 2, I get these...

#pragprog #errata /book-python-testing-with-pytest

5 2081 1

2020-07-27 19:33:14 UTC

New

PragProg Customers

Docker for Rails Developers: Notes for Rails 6.1, Ruby 2.7.2

I thought that there might be interest in using the book with Rails 6.1 and Ruby 2.7.2. I’ll note what I needed to do differently here. ...

/book-docker-for-rails-developers

9 1177 1

2021-01-03 20:41:43 UTC

New

PragProg Customers

Distributed Services with Go: Chapter 3 suggestions

Page 28: It implements io.ReaderAt on the store type. Sorry if it’s a dumb question but was the io.ReaderAt supposed to be io.ReadAt? ...

#errata /book-distributed-services-with-go

0 1302 3

2022-07-27 14:35:18 UTC

New

PragProg Customers

Programming Phoenix LiveView: Typo

Hi! I know not the intentions behind this narrative when called, on page XI: mount() |> handle_event() |> render() but the correc...

#errata /book-programming-phoenix-liveview

3 1307 17

2021-03-11 16:34:20 UTC

New

PragProg Customers

Distributed Services with Go: receiving Unknown flag: --go_opt when compiling protobuf (page 20)

When trying to generate the protobuf .go file, I receive this error: Unknown flag: --go_opt libprotoc 3.12.3 MacOS 11.3.1 Googling ...

/book-distributed-services-with-go

0 4924 3

2021-08-18 18:19:51 UTC

New

PragProg Customers

Python Testing with pytest, Second Edition: File not Found Error (page 43)

I ran this command after installing the sample application: $ cards add do something --owner Brian And got a file not found error: Fil...

#errata /book-python-testing-with-pytest-second-edition

5 4391 7

2021-07-03 13:51:08 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: android:tint vs app:tint (chapter 7, p186)

I found an issue in Chapter 7 regarding android:backgroundTint vs app:backgroundTint. How to replicate: load chapter-7 from zipfile i...

#errata /book-kotlin-and-android-development-featuring-jetpack

0 3566 3

2022-04-26 09:10:52 UTC

New

PragProg Customers

Kotlin and Android Development featuring Jetpack: allprojects should be moved to settings.gradle (page 245)

The allprojects block listed on page 245 produces the following error when syncing gradle: “org.gradle.api.GradleScriptException: A prob...

#suggestion /book-kotlin-and-android-development-featuring-jetpack

1 2304 1

2022-02-26 23:52:12 UTC

New

PragProg Customers

Hands on Rust: Need help with error - thread 'main' panicked at 'Failed to load texture

Hi, I need some help, I’m new to rust and was learning through your book. but I got stuck at the last stage of distribution. Whenever I t...

#question /book-hands-on-rust

3 1989 5

2022-12-03 00:17:31 UTC

New

PragProg Customers

Hands-on Rust: Chapter 3: Can't get first hello to run

Hello @herbert ! Trying to get the very first “Hello, Bracket Terminal!" example to run (p. 53). I develop on an Amazon EC2 instance runn...

#question /book-hands-on-rust

0 1147 2

2025-01-07 19:49:45 UTC

New

Other popular topics

General Dev>Dev Chat

What are you listening to?

A thread that every forum needs! Simply post a link to a track on YouTube (or SoundCloud or Vimeo amongst others!) on a separate line an...

#community #music

202 5126 102

2025-07-26 22:00:31 UTC

New

Game Dev>Learning Resources

The Ray Tracer Challenge

Brace yourself for a fun challenge: build a photorealistic 3D renderer from scratch! In just a couple of weeks, build a ray tracer that r...

pragprog.com

#pragprog #published-book /book-the-ray-tracer-challenge #algorithms

3 6115 0

2020-09-22 14:26:56 UTC

New

Game Dev>Learning Resources

Hands-on Rust: Effective Learning through 2D Game Development and Play

Rust is an exciting new programming language combining the power of C with memory safety, fearless concurrency, and productivity boosters...

pragprog.com

#pragprog /rust #published-book /book-hands-on-rust

117 10879 30

2024-11-09 13:24:20 UTC

New

Backend>Chat

How to install Ruby 3 with ASDF

In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...

/ruby #asdf

11 5961 4

2021-02-02 08:02:13 UTC

New

Backend>Chat

Rails console using 100% CPU in dev (fix)

If you are experiencing Rails console using 100% CPU on your dev machine, then updating your development and test gems might fix the issu...

/ruby /rails

3 4188 3

2021-02-04 07:08:45 UTC

New

General Dev>Dev Chat

PragProg’s Medium Posts

Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.

#pragprog #blog-post

1147 29994 760

2025-07-10 13:36:16 UTC

New

Backend>Chat

Using Regular Expressions in Erlang

Intensively researching Erlang books and additional resources on it, I have found that the topic of using Regular Expressions is either c...

/erlang #regular-expressions

91 5662 43

2021-09-06 19:12:48 UTC

New

Backend>Learning Resources

Effective Haskell

Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...

pragprog.com

#pragprog /haskell #published-book /book-effective-haskell

15 10218 1

2022-02-16 10:09:51 UTC

New

AI>In The News

DeepSeek (671B) running on a cluster of 8 Mac Mini Pros with 64GB RAM each

This is cool! DEEPSEEK-V3 ON M4 MAC: BLAZING FAST INFERENCE ON APPLE SILICON We just witnessed something incredible: the largest open-s...

#ai #macs /deepseek

0 6695 1

2025-01-29 18:43:37 UTC

New

General Dev>Reviews

Keyboard Review: UHK60V2 vs Defy vs Voyager vs Glove80 vs Svalboard

Ok, well here are some thoughts and opinions on some of the ergonomic keyboards I have, I guess like mini review of each that I use enoug...

/keyboards #uhk60v2 #defy #voyager #glove80 #svalboard

5 5681 7

2025-04-21 21:44:45 UTC

New

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)

VAK

Real-Time Phoenix: only the first 3 responses are displayed on the console (p.101)