websocket ping-pong implementation

[John Lima]

Hello,

Has anyone tried implementing websocket ping-pong messages on top of
mongoose websockets?

I'd like to avoid adding a new thread per connection to send ping packets
and because my list of active connections isn't in a threadsafe
datastructure, it doesn't seem feasible to send the pings for all
connections from one thread.

My current idea is to rejigger another thread that handles the connection
list data structure to occasionally stop its normal operation and sing the
ping packets, but this doesn't feel like a very good solution.

Any suggestions?

Thanks in advance!

John

[Sergey Lyubka]

Reading RFC, it looks like either side (browser or server) may initiate
ping.
What is your intention, is it making server send pings?
Is it for checking that browser is still connected?

Post by John Lima
Hello,
Has anyone tried implementing websocket ping-pong messages on top of
mongoose websockets?
I'd like to avoid adding a new thread per connection to send ping packets
and because my list of active connections isn't in a threadsafe
datastructure, it doesn't seem feasible to send the pings for all
connections from one thread.
My current idea is to rejigger another thread that handles the connection
list data structure to occasionally stop its normal operation and sing the
ping packets, but this doesn't feel like a very good solution.
Any suggestions?
Thanks in advance!
John
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[John Lima]

I'm trying to get the server side to send pings.

My use case is that it seems Mongoose won't exit when there is a websocket
connected because a worker thread is blocked on a read. I'm thinking that
the pong reply will unblock the thread, allowing it to realize that it
should exit.

I'm also doing it as a keep alive, so I can have timeouts on normal HTTP
requests while still having long-lived "idle" websockets.

Thanks!

Post by Sergey Lyubka
Reading RFC, it looks like either side (browser or server) may initiate
ping.
What is your intention, is it making server send pings?
Is it for checking that browser is still connected?

Post by John Lima
Hello,
Has anyone tried implementing websocket ping-pong messages on top of
mongoose websockets?
I'd like to avoid adding a new thread per connection to send ping packets
and because my list of active connections isn't in a threadsafe
datastructure, it doesn't seem feasible to send the pings for all
connections from one thread.
My current idea is to rejigger another thread that handles the connection
list data structure to occasionally stop its normal operation and sing the
ping packets, but this doesn't feel like a very good solution.
Any suggestions?
Thanks in advance!
John
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[Sergey Lyubka]

I think people have done what you're asking about:

https://github.com/cesanta/mongoose/issues/195
https://groups.google.com/forum/#!topic/mongoose-users/6khOpJQeqSI

Post by John Lima
I'm trying to get the server side to send pings.
My use case is that it seems Mongoose won't exit when there is a websocket
connected because a worker thread is blocked on a read. I'm thinking that
the pong reply will unblock the thread, allowing it to realize that it
should exit.
I'm also doing it as a keep alive, so I can have timeouts on normal HTTP
requests while still having long-lived "idle" websockets.
Thanks!

Post by Sergey Lyubka
Reading RFC, it looks like either side (browser or server) may initiate
ping.
What is your intention, is it making server send pings?
Is it for checking that browser is still connected?

Post by John Lima
Hello,
Has anyone tried implementing websocket ping-pong messages on top of
mongoose websockets?
I'd like to avoid adding a new thread per connection to send ping
packets and because my list of active connections isn't in a threadsafe
datastructure, it doesn't seem feasible to send the pings for all
connections from one thread.
My current idea is to rejigger another thread that handles the
connection list data structure to occasionally stop its normal operation
and sing the ping packets, but this doesn't feel like a very good solution.
Any suggestions?
Thanks in advance!
John
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