With gun-2.0.0-rc.1, apns reconnections are much more frequent than with gun-1.3.3

[jainygaurav]

This is in continuation with: #242.

Why reconnections are more in gun-2.0.0-rc.1 compared to gun-1.3.3? Please help.

OTP: 19.3.6
git clone https://github.com/inaka/apns4erl.git

{deps, [
  {gun, "2.0.0-rc.1"},   --------------------> **it was 1.3.3 when I cloned anps4erl**.
  {unicode_util_compat, "0.7.0"},
  {jsx, "3.0.0"},
  {base64url, "1.0.1"}
]}.

When apns4erl was built with gun-1.3.3, it was hitting issue #242. To resolve that issue, I build apns4erl with gun-2.0.0-rc.1.

• Since then, apns reconnections are much more frequent

• From log timestamps, it looks like for every 2 hours.

• However, I am able to send push notifications after reconnections and without any restart.

• I print these logs as errors when apns4erl sends {reconnecting, ServerPid} or {connection_up, ServerPid} messages to my gen_server

> 2021-03-09 03:59:10.501 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 03:59:11.548 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 2021-03-09 05:59:11.571 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 05:59:12.618 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 2021-03-09 07:59:12.641 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 07:59:13.693 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 2021-03-09 09:59:13.716 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 09:59:14.764 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 2021-03-09 11:59:14.787 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 11:59:15.832 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 2021-03-09 13:59:15.855 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
> 2021-03-09 13:59:17.067 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
> 
> 2021-03-09 15:38:29.407 [error] <0.497.0>@mod_tymeit_apns:sendAPNS:320 Success in request. Reason was: 200 with <<"9z1f88da4e9c5dsa87a6d186dad745b3b6817d9fd2ddea095fgfgdfa608c0929d31d">>
> 

[jainygaurav]

Looks like apns4erl or gun reconnects every two hours if there was no activity on the connection.

• Here it reconnected.

2021-03-09 13:59:15.855 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
2021-03-09 13:59:17.067 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns trying connection_up with ServerPid <0.509.0>

• Here I sent a notification before two hours expire.

 2021-03-09 15:38:29.407 [error] <0.497.0>@mod_tymeit_apns:sendAPNS:320 Success in request. Reason was: 200 with 
 <<"9z1f88da4e9c5dsa87a6d186dad745b3b6817d9fd2ddea095fgfgdfa608c0929d31d">>

• Now it tries to reconnect two hours from the time I sent the notification

2021-03-09 17:38:29.472 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
2021-03-09 17:38:30.517 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>
2021-03-09 19:38:30.540 [error] <0.497.0>@mod_tymeit_apns:handle_info:72 apns trying reconnecting with ServerPid <0.509.0>
2021-03-09 19:38:31.587 [error] <0.497.0>@mod_tymeit_apns:handle_info:75 apns connection_up with ServerPid <0.509.0>

[ferigis]

hi, this issue is more related with gun because we are built on top of 1.3.3 version and we don't plan to migrate it to a release candidate dependency.

If you find any error with that gun version it would be good to share with gun folks, since it is still in a release candidate phase.

[jainygaurav]

@ferigis But apns4erl with gun-1.3.3 runs into #242. That was the reason I tried using gun-2.0.0-rc.1.

Is it possible to fix #242 with gun-1.3.3? Should I re-open #242?