[Freeswitch-users] Sending keepalives on Verto websocket

Anthony Minessale anthony.minessale at gmail.com
Wed Oct 11 04:40:17 UTC 2017 

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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>>>>
>>>> ------------------------------
>>>>
>>>> This e-mail and any files transmitted with it may contain privileged or
>>>> confidential information. It is solely for use by the individual for whom
>>>> it is intended, even if addressed incorrectly. If you received this e-mail
>>>> in error, please notify the sender; do not disclose, copy, distribute, or
>>>> take any action in reliance on the contents of this information; and delete
>>>> it from your system. Any other use of this e-mail is prohibited.
>>>>
>>>> Thank you for your compliance.
>>>> ------------------------------
>>>>
>>>>
>>>> _________________________________________________________________________
>>>> Professional FreeSWITCH Consulting Services:
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>>>> http://www.freeswitchsolutions.com
>>>>
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>>>
>>>
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>>>
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>>
>>
>>
>> --
>> Ítalo Rossi
>> italo at freeswitch.org
>>
>> _________________________________________________________________________
>> Professional FreeSWITCH Consulting Services:
>> consulting at freeswitch.org
>> http://www.freeswitchsolutions.com
>>
>> Official FreeSWITCH Sites
>> http://www.freeswitch.org
>> http://confluence.freeswitch.org
>> http://www.cluecon.com
>>
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>>
>
> _________________________________________________________________________
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> http://www.freeswitchsolutions.com
>
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>
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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