Awesome, thanks for the hints. I got TwoPartyVat working just now over standard sockets, so I am beyond EZ! =) (really wasn't that bad).
One thing I need to layer in is an http /healthz endpoint so my loadbalancer knows my service is alive. Prob super easy, but I am pretty noob at kj::async. Basically how do I add a router into an ioContext? Is it possible to have some http get at the same time as rpc on the same port? My current implementation (uwebsockets) gives me cb for onOpen, onConnection, onClose, and onMessage for the http and ws sides of things separately, so I have some separation between these sides and the http loadbalancer is happy cause it gets to talk to /healthz. I'll look at your gnarly prod code and see what I can skim off into my mind. =) been a happy capnp serializer for 4 years or so at this point, nice stuff, thanks! On Wed, Sep 19, 2018 at 4:16 PM Kenton Varda <[email protected]> wrote: > Hi Asa, > > I don't think anyone has actually implemented TwoPartyVatNetwork over > WebSockets yet -- at least, I haven't heard of anyone doing it. It > certainly should be possible, though. First you'll need to decide if you > want to reuse WebSocket message framing at all, or just throw away the > frame boundaries and treat it as a byte stream. If you want to keep the > framing, you'd probably need to implement a custom VatNetwork, since > TwoPartyVatNetwork assumes an AsyncIoStream. If you go the byte stream > approach, then the thing you need to do is implement AsyncIoStream as a > wrapper around WebSocket. That should mostly be straightforward, assuming > familiarity with the KJ async framework. Once you have that, you can pass > it into TwoPartyVatNetwork. > > If you're looking for example code that uses KJ HTTP, there is Sandstorm: > > > https://github.com/sandstorm-io/sandstorm/blob/master/src/sandstorm/gateway.h > > However, that's real-world code, not a simple example. Unfortunately I > haven't written any samples yet... I'd like to write better documentation > for all of KJ soon... > > Let me know if you have more specific questions, and please keep us > updated on your progress. :) > > -Kenton > > On Tue, Sep 18, 2018 at 10:58 PM Asa <[email protected]> wrote: > >> Are there any examples of the WebSocket service from compat/http.h that >> is a self contained starting point? I am trying to get my head around how >> to layer these components into a larger service. Basically I want to use >> rpc over a websocket from the browser(via wasm) to a c++ service running a >> TwoPartyVatNetwork. My current working implementation uses capnp >> serialized structs in an async service(but not interfaces/rpc), from wasm >> (compiled from c++) to a c++ asio websocket server. I separately brought >> the ezrpc service up and extended the calc example, but now I want to >> finish out the conversion and prototype how to replace my asio server. >> >> Any pointers on where to look for more TwoPartyVatNetwork implementations >> and/or docs would be great. Especially on how to save some state like a jwt >> token ( via an auth capability?) in the open websocket, or if there is an >> example somewhere of TwoPartyVatNetwork over websockets. >> >> Thanks in advance. >> >> Asa >> >> -- >> 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 [email protected]. >> Visit this group at https://groups.google.com/group/capnproto. >> > -- 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 [email protected]. Visit this group at https://groups.google.com/group/capnproto.
