Is there anyone who handles Polkadot in Java or Rust?

[paperfrog95]

I am developing by a coin exchange company.
so, I can't use polkadot-js.
I have a problem of not being able to decode extrinsics received from this polkadot's node.

Apart from this node, my server will decode it and collect data.
(my server use java, but I can also use Rust through Java Navtive Inteface)

However, I don't know how to decode. What library or crate should I use?

I know extrinsics is encoded through scale-codec.

I just don't know what library to decode this with.

so please tell us detailed guidelines or how to use it.

[drahnr]

This has only been enabled very recently with the advent of the type annotation paritytech/substrate#8615 which can be utilized with i.e. (:warning: alpha :warning: ) https://github.com/paritytech/subxt

[KiChjang]

There is also parity-scale-codec, which is the crate that we use internally to encode/decode SCALE data. As you said, you can either use this via JNI, or make a Java-based SCALE encoder/decoder. The latter is preferred as Rust types aren't 1-to-1 convertible to Java types -- you'll need to do that conversion even if you're using JNI.

[drahnr]

@KiChjang 's approach is easier if you only need a few dozen types.

[paperfrog95]

Thank you for your opinions. In order to use it at the production level, I have to use scale-codec to develop it again..
Polkadot is developed as Rust, right?
It's strange that there's no utility or library for decoding in a rust environment. haha

[KiChjang]

It's strange that there's no utility or library for decoding in a rust environment. haha

I don't understand what you're saying? We just told you that there's subxt and parity-scale-codec.

[paperfrog95]

Polkadot-js is providing a lot of support.
What I mean is that there's no utility for me to use at the production level.
Even if scale-codec is used, I have to proceed with the development one more time.

[KiChjang]

We are using parity-scale-codec at the production level. parity-scale-codec is developed in Rust and for Rust.

In any case, your question has been answered in multiple communication channels, and I'll be closing this issue.