Hi Louis, This is somewhat embarrassing, but there is no level 3 implementation of Cap'n Proto today, in any language. It's likely that when I get around to implementing it in C++, the protocol spec will change to solve unanticipated problems. As such, trying to implement the spec as-written in Go today might be frustrating, as it may be hard to tell the difference between the spec having a bug vs. the spec doing something weird intentionally, and there's no reference implementation to test against. :/
As for level 2, yes, we eventually realized that level 2 doesn't really belong in the core spec at all, so you can pretty much ignore the level 2 interfaces. Maybe I should actually delete them... -Kenton On Wed, Sep 23, 2020 at 11:02 AM lthibault <louis...@gmail.com> wrote: > Hello everyone, > > I'm currently using the Go implementation > <https://github.com/capnproto/go-capnproto2> of Cap'n Proto, which > features Level 1 support for the RPC protocol, and I'm discovering that my > use case would benefit greatly from Level 3 support. Since Ross is no > longer actively maintaining the project, I'm investigating the possibility > of implementing Level 3 support myself, and possibly volunteering to > maintain the project. > > I've read through the Cap'n Proto spec (i.e. the .capnp files in the > github repository, especially the network interface sketch > <https://github.com/capnproto/capnproto/blob/cf34b937f08af618b4dc057a0f5dd47acbf4e615/c%2B%2B/src/capnp/rpc.capnp#L1375-L1476>), > perused conversations in this Google Group, and even tried to scavenge from > the E language website/wiki, but I'm still struggling to get a "big > picture" idea of how the 3-way introduction protocol works. > > As such, I'm you kind folks might be able to point me in the right > direction, starting with two very general questions: > > 1. How does the 3-way introduction protocol work? Is it specified > anywhere (e.g. in an RFC?) > 2. What does the roadmap look like from Leve 1 to Level 3? > 3. My understanding from reading the source is that Level 2 can > largely be ignored. Does Level 3 depend on level 2 in any way? The > numbering suggests so... > > Many thanks in advance, > Louis > > -- > You received this message because you are subscribed to the Google Groups > "Cap'n Proto" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to capnproto+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/capnproto/e9ad3f6d-a78c-4991-a3de-9a0fc071b906n%40googlegroups.com > <https://groups.google.com/d/msgid/capnproto/e9ad3f6d-a78c-4991-a3de-9a0fc071b906n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Cap'n Proto" group. To unsubscribe from this group and stop receiving emails from it, send an email to capnproto+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/capnproto/CAJouXQnAGjqqv7BTGt8Pi9qCxr%2Bu4n1wiEma-xo3bDbgSzqhjQ%40mail.gmail.com.
