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Top-level
 There are various bindings for Varlink available from the Varlink project, but with systemd v257 we now make systemd's own C implementation available publically too: sd-varlink. sd-varlink has been around for quite a while, and is quite well tested (including fuzzed) by now hence. It's already driving your systemd installations, except mostly internally so far. Since Varlink uses JSON for marshalling its messages, sd-varlink comes with a companion API: sd-json. It's another C library for JSON. 3 comments
i.e. for example handles base64 encoding/decoding for handling binary blobs within JSON automatically, or it helps you with dealing with JSON's >53bit integer problem, and various other things. Right now, documentation for sd-varlink and sd-json is scarce (one could even say "barely existing"), but there are plenty of real-life examples in the systemd source tree, of course. At Linux' best conference, All Systems Go! 2024 in Berlin this year I gave a (brief) talk about Varlink, and why you should consider it. If you want to know more about the concept, this might be a good starting point: https://media.ccc.de/v/all-systems-go-2024-276-varlink-now- And that's all for now, enjoy! |
Gregory's Server
You are of course right if you say that there are already so many of those, why another? And you'd be right. My answer to that is that sd-json is much nicer to use than most, since it doesn't just allow you deal with JSON objects, it also helps you with building them from C data structures, and to map JSON objects back to C data structures. It also helps you with higher level operations that the low-level JSON datatypes leave you in the cold with: