Both notification hubs send a Ping every 15 seconds but ignore the
Pong, so the loop only ends on a Close frame, EOF or a socket error.
When a client disappears without the TCP connection being closed, for
example behind a reverse proxy or CDN that keeps the upstream
connection open, none of these ever happens. The connection, its file
descriptor and its map entry are then kept forever, until the process
runs out of file descriptors and stops accepting connections and
opening the database.
Keep track of when something was last received from the client, Pongs
included, and close the connection when nothing was received for 30
seconds. This is the default ClientTimeoutInterval of ASP.NET Core
SignalR, which the official server uses.
Fixes#7805
Co-authored-by: Cassian433 <262026629+Cassian433@users.noreply.github.com>
Co-authored-by: Daniel García <dani-garcia@users.noreply.github.com>
Cassian433
42aa3ee1c7