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Cap'n Proto works great over unix sockets. For sandboxing usecases in Sandstorm and Cloudflare Workers, I've commonly used it over anonymous socketpairs -- defi

Cap'n Proto works great over unix sockets. For sandboxing usecases in Sandstorm and Cloudflare Workers, I've commonly used it over anonymous socketpairs -- definitely no ports involved there. :) In fact, you can adapt the RPC system to operate over any kind of byte stream transport pretty easily, by implementing the kj::AsyncIoStream interface. Or if you already have a standard file descriptor (or iocp-compatible HANDLE in Windows), you can use that. One fancier thing that's still on the roadmap is shared-memory IPC. Cap'n Proto's zero-copy serialization was really built for this, but so far for all my real-world projects, Unix sockets have been fast enough, so I haven't been forced to full implement a shared memory transport yet. Maybe soon?

zokier 7y ago
It's bit frivolous question, but would it be easy to use stdin/stdout as transport for capnp?
- kentonv 7y ago
  Sure, you could do that. You'd need to write a little shim to bind separate input stream and output stream FDs into a single AsyncIoStream but that shouldn't be hard.