This library is designed to provide a central cache of ClientConn's to make better use of the built in multiplexing and reduce the amount of TCP handshakes that need to take place.
The lifetime of a connection is managed through
the connectivity API. The go gRPC implementation
does not currently implement idle_timeout to
automatically change its state to idle, we can
force this from the server side using the
GOAWAY mechanism which is implemented easily
with this ServerOption:
grpc.KeepaliveParams(keepalive.ServerParameters{
MaxConnectionIdle: 60 * time.Second,
})This way if the client connection does not have
an open stream, or if it hasn't done an RPC call
in MaxConnectionIdle duration then it will
automatically remove the connection from the
cache and perform a graceful closure.
The connectivity API will also change state when there's a problem with the connection etc. But do be aware there is a small period of time where broken connections may be served up before a connection issue is detected. You can read more in the connectivity semantics and api doc.