[Freeswitch-users] Sending keepalives on Verto websocket

Chad Phillips chad at apartmentlines.com
Wed Oct 11 18:03:16 UTC 2017 

Tony, curious if by this you mean it would just be best to set the
proxy_read_timeout value in Nginx to whatever means ’never’, and let TCP
handle cleaning up disconnects? I’ll certainly admit I’m no expert here,
open to suggestions…

On Tue, Oct 10, 2017 at 9:40 PM, Anthony Minessale <
anthony.minessale at gmail.com> wrote:

> The whole idea of a proxy read timeout is a hack.
> Working around it forces more hacks.
> Tcp has this covered......
>
> On Tue, Oct 10, 2017 at 10:43 PM Chad Phillips <chad at apartmentlines.com>
> wrote:
>
>> proxy_read_timeout would be an approach to solve the issue from the Nginx
>> config side. I don’t like that solution as much, though, because it
>> requires guessing how long the socket might be idle, whereas the keepalives
>> can be reliably sent to always prevent the timeout.
>>
>> On Tue, Oct 10, 2017 at 7:02 PM, Ítalo Rossi <italo at freeswitch.org>
>> wrote:
>>
>>> Are we talking about proxy_read_timeout param?
>>>
>>> On Tue, Oct 10, 2017 at 8:51 PM, Chad Phillips <chad at apartmentlines.com>
>>> wrote:
>>>
>>>> I’ve seen this issue when everyone is audio muted and/or doesn’t
>>>> trigger a talking event for more than 60 seconds, which in my use case does
>>>> happen. I would agree under normal videoconferencing circumstances it would
>>>> be rare to go 60 seconds without a single event being sent along the
>>>> websocket.
>>>>
>>>> On Mon, Oct 9, 2017 at 7:38 AM, Mundkowsky, Robert <rmundkowsky at ets.org
>>>> > wrote:
>>>>
>>>>> I am curious, what type of situation causes this problem?  I mean, we
>>>>> use Verto for a conference, granted without Nginx, and seems like there are
>>>>> always packets being sent back and forth even when there is no audio or
>>>>> video.
>>>>>
>>>>>
>>>>>
>>>>> Robert
>>>>>
>>>>>
>>>>>
>>>>> *From:* FreeSWITCH-users [mailto:freeswitch-users-
>>>>> bounces at lists.freeswitch.org] *On Behalf Of *Chad Phillips
>>>>> *Sent:* Friday, October 6, 2017 4:53 PM
>>>>> *To:* FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
>>>>> *Subject:* Re: [Freeswitch-users] Sending keepalives on Verto
>>>>> websocket
>>>>>
>>>>>
>>>>>
>>>>> There are various suggested solutions out there. On the Nginx config
>>>>> side, easiest is to increase the proxy_read_timeout setting to
>>>>> something high, but that seems like it could result in connections getting
>>>>> hung open if the server process goes away.
>>>>>
>>>>>
>>>>>
>>>>> Then there’s this module which looks pretty fancy and claims to solve
>>>>> the problem: https://github.com/yaoweibin/nginx_tcp_proxy_module
>>>>> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fyaoweibin%2Fnginx_tcp_proxy_module&data=02%7C01%7Crmundkowsky%40ets.org%7C8340e5ebbbbe4d94bb6b08d50cfcf688%7C0ba6e9b760b34fae92f37e6ddd9e9b65%7C0%7C0%7C636429202964109077&sdata=lFoJ8DsDuceYjteVcZ72fMtgH%2BgmSWHj5g1MvTe%2FKzs%3D&reserved=0>
>>>>> — it requires custom compiling nginx though…
>>>>>
>>>>>
>>>>>
>>>>> I think I’ll stick with my current solution, which basically follows
>>>>> the other suggestion of having the server send periodic keepalives, except
>>>>> that I’m initiating from the client. Steps for others interested:
>>>>>
>>>>>
>>>>>
>>>>> 1. Add ‘echo’ to the list of jsonrpc-allowed-methods in any relevant
>>>>> domains in your user directory
>>>>>
>>>>>
>>>>>
>>>>> 2. Do something like this after a successful websocket connection:
>>>>>
>>>>>
>>>>>
>>>>>           MODULE.keepAliveTimer = setInterval(function() {
>>>>>
>>>>>             verto.rpcClient.call("echo", {keepalive: true});
>>>>>
>>>>>           }, VERTO_KEEPALIVE_INTERVAL)
>>>>>
>>>>>
>>>>>
>>>>> 3. Add some cleanup on websocket close:
>>>>>
>>>>>
>>>>>
>>>>>         if (MODULE.keepAliveTimer) {
>>>>>
>>>>>           clearInterval(MODULE.keepAliveTimer);
>>>>>
>>>>>           MODULE.keepAliveTimer = null;
>>>>>
>>>>>         }
>>>>>
>>>>>
>>>>>
>>>>> Request and response lengths are both under 150 characters, so pretty
>>>>> short, and I set the intervals at 50 seconds, since Nginx’s default timeout
>>>>> is 60 seconds.
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Oct 6, 2017 at 6:39 AM, Mundkowsky, Robert <
>>>>> rmundkowsky at ets.org> wrote:
>>>>>
>>>>> Have you checked if Nginx has timeout settings and/or keep alive
>>>>> settings?
>>>>>
>>>>>
>>>>>
>>>>> https://stackoverflow.com/questions/10550558/nginx-tcp-
>>>>> websockets-timeout-keepalive-config
>>>>> <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F10550558%2Fnginx-tcp-websockets-timeout-keepalive-config&data=02%7C01%7Crmundkowsky%40ets.org%7C8340e5ebbbbe4d94bb6b08d50cfcf688%7C0ba6e9b760b34fae92f37e6ddd9e9b65%7C0%7C0%7C636429202964109077&sdata=5Ds%2BMnxK3AzpWTZ0JEfO3taJPp16uIK2UdKWfTLcvJg%3D&reserved=0>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Robert
>>>>>
>>>>>
>>>>>
>>>>> *From:* FreeSWITCH-users [mailto:freeswitch-users-
>>>>> bounces at lists.freeswitch.org] *On Behalf Of *Chad Phillips
>>>>> *Sent:* Thursday, October 5, 2017 11:07 PM
>>>>> *To:* FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org>
>>>>> *Subject:* [Freeswitch-users] Sending keepalives on Verto websocket
>>>>>
>>>>>
>>>>>
>>>>> I've switched to using Nginx to proxy Verto websockets, and have run
>>>>> into a small snag: by default, if Nginx doesn't read any data from a proxy
>>>>> backend within 60 seconds, it closes the connection, even for websockets.
>>>>>
>>>>>
>>>>>
>>>>> It appears the recommended solution is to have the server send some
>>>>> kind of regular keepalive. I poked around in mod_verto.c and found a
>>>>> 'request.keepalive' variable, but I'm unclear how to set that in the
>>>>> request, and/or if it even accomplishes what I'm wanting.
>>>>>
>>>>>
>>>>>
>>>>> I've solved the issue for now by periodically sending a JSON RPC
>>>>> 'echo' request along the websocket every 50 seconds, and the reply from the
>>>>> server is enough to keep the connection open. This is fine, but I am
>>>>> curious if there's a way to do it just from the server side, and if not, if
>>>>> it's worth it to add a setting to enable that functionality?
>>>>>
>>>>>
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>>>>>
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>>>>>
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>>>>>
>>>>> ------------------------------
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>>>>> This e-mail and any files transmitted with it may contain privileged
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>>>>> e-mail in error, please notify the sender; do not disclose, copy,
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>>>>>
>>>>> Thank you for your compliance.
>>>>> ------------------------------
>>>>>
>>>>> ____________________________________________________________
>>>>> _____________
>>>>> Professional FreeSWITCH Consulting Services:
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>>>>> http://www.freeswitchsolutions.com
>>>>>
>>>>> Official FreeSWITCH Sites
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>>>>>
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>>>>
>>>>
>>>> ____________________________________________________________
>>>> _____________
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>>>>
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>>>
>>>
>>>
>>> --
>>> Ítalo Rossi
>>> italo at freeswitch.org
>>>
>>> ____________________________________________________________
>>> _____________
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>>>
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>>
>> _________________________________________________________________________
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>>
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>
> --
> Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬
>
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