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?

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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!

[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