No reconnection (and lack of debugger) #129
Description
Conditions
OS: Arch Linux x86_64
Kernel: 6.8.1-arch1-1
Erlang: 26.0
Elixir: 1.16.0-otp-26
Dependencies:
Jason: 0.4.3
WebSockex: 1.4.1
Description
The problem is that when disconnecting the ethernet device, the WebSockex server does not always reconnect.
It reconnects only if the connection is lost for no more than 5 seconds. If more time has passed, it does not reconnect anymore and the debugger does not register anything useful.
Flow I expected
- Check ethernet status:
eno1connected - Connect WebSockex: start my BasicSocket, establish connection, and subscribe on events (exchange stuff)
- Disconnect ethernet, socket lost connection and does not receive events
- Wait for a while...
- Connect ethernet, socket establishes connection and continue receive events
Flow 1: Fast reconnection, as I expected
- Check ethernet status...
- Connect WebSockex...
- Disconnect ethernet...
- Wait for at most 5 seconds
- Connect ethernet, socket maybe establishes connection and receive events anymore!
Flow 2: Long reconnection, as I did not expected
- Check ethernet status...
- Connect WebSockex...
- Disconnect ethernet...
- Wait for at least 5 seconds
- Connect ethernet, socket maybe establishes connection and does not receive events anymore!
Initial setup 15:01:47 (eno1 connected, socket receives events):
- I started new WebSockex server, and subscribed on events with a special subscription message -- socket established connection, socket began receiving events.
Disconnection 15:02:10 (eno1 disconnected, socket does not receive events):
- I disconnected eno1 (my ethernet), and it stopped socket.
Reconnection 15:07:12 (eno1 connected, socket still does not receive events)
- I reconnected eno1 again. But still no events. And even no logs. It even does not try to establish connection again.
BasicSocket:
defmodule Experiments.BasicSocket do
use WebSockex
require Logger
alias :zlib, as: Zlib
alias Experiments.BasicSocket.Helpers
@origin "wss://open-api-swap.bingx.com/swap-market"
def start_link(state, options \\ []) do
WebSockex.start_link(@origin, __MODULE__, state, options)
end
def send(pid, message) do
WebSockex.cast(pid, {:"$send", message})
end
@impl true
def handle_connect(_conn, state) do
channel = Helpers.sub_message()
__MODULE__.send(self(), channel)
{:ok, state}
end
@impl true
def handle_disconnect(_details, state) do
{:reconnect, state}
end
@impl true
def handle_frame({:binary, frame}, state) do
case Zlib.gunzip(frame) do
"Ping" ->
{:reply, {:text, "Pong"}, state}
_ ->
Logger.info("*INFO* event received")
{:ok, state}
end
end
@impl true
def handle_cast({:"$send", message}, state) do
{:reply, {:text, message}, state}
end
endMain question
Why WebSockex reconnects for a short disconnection periods, and does not reconnect for long periods in this case?
Side question
Why is the debugger so laggy in iex sessions?
Are there other options to debug my case? How can I get additional information about what happens under the "hood"?
Activity
roylez commentedon May 2, 2024
Thanks for pointing me to the right direction as this has been troubling me for some time.
A workaround is to send a ping frame every 30 seconds.
kyleboe commentedon Mar 3, 2026
Amazing! I think this is the issue I've been having as well with an app deployed to Fly.