ServerBuilder should expose keepalive methods from NettyServerBuilder

[liamcassidy-eb]

Hello,

We've been encountering issues with connections getting closed. Eric Anderson recommended adjusting keep-alive settings on the server and client (here). However, when I went to configure these settings, I couldn't find any documentation on it or examples on the grpc kotlin side. Could you help point me to how we can configure the server-side options mentioned in the keep alive docs?

We've also asked this in grpc-kotlin here and thought that it would be helpful to ask on the java side as grpc-kotlin has the same API for server building as grpc-java. You can find further context in that issue as well.
issue: grpc/grpc-kotlin#331

@ejona86 mentioned that this might be related to

Looks like the keepalive API is only on NettyServerBuilder, not ServerBuilder.

Please let us know if you need any further information and we'll get that to you ASAP! 🙏

[faculbsz-sg]

Hi, do you mind sharing your grpc, protobuf, netty dependencies versions for your kotlin service?
https://github.com/grpc/grpc-java/blob/master/SECURITY.md#netty

[liamcassidy-eb]

Hello, we're using:

+--- io.grpc:grpc-netty-shaded:1.40.1

As for protobufs is there something, in particular, you would need to look at? Happy to share generic examples but I want to be careful about what we expose as this is an internal API.

[ejona86]

NettyServerBuilder has the appropriate API. You'd need to use the APIs io.grpc.netty.NettyServerBuilder (and swap to grpc-netty) or the questionable io.grpc.netty.shaded.io.grpc.netty.NettyServerBuilder (to continue with grpc-netty). Neither option is great as grpc-netty-shaded is much preferred over grpc-netty but nominally it doesn't really expose a public API.

As a short-term "get it working." Using io.grpc.netty.shaded.io.grpc.netty.NettyServerBuilder is probably fair. But we need to add the keepalive methods to io.grpc.ServerBuilder.