Debugging Cap'n Proto RPC

[Samuel Ainsworth]

How do people tend to debug/play with Cap'n Proto RPC servers? Is there anything like Postman for capnproto?

[Kenton Varda]

Hi Samuel,

Unfortunately, there isn't a lot of tooling available for Cap'n Proto. I tend to debug by adding KJ_DBG() statements to my code (basically a fancy printf()). Cap'n Proto messages are stringified nicely by KJ_DBG() and related macros.

The `capnp` tool also has the ability to convert encoded messages into text and vice versa (see `capnp --help`), but that's more for serialization. I'd love to extend the `capnp` tool with a mode where it connects to an RPC server and lets you type in calls dynamically, or maybe a mode where it acts as a proxy and logs all the calls it sees going back and forth... so much to build, so little time. :)

-Kenton

On Wed, Apr 29, 2020 at 4:59 PM Samuel Ainsworth <skain...@gmail.com> wrote:

How do people tend to debug/play with Cap'n Proto RPC servers? Is there anything like Postman for capnproto?

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[Samuel Ainsworth]

I hear ya! :) I’m using capnproto via the rust language bindings, so figuring out KJ_DBG() may be more trouble than its worth for me. I’ll push forward!

Thanks,

Samuel 

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