Scale codec error: Not enough data to fill buffer

[shekohex]

Hello, I started to face this issue whenever I try to read from the Storage in the latest Substrate master.

Here is a simple example to reproduce the issue:

Ok, I've made the minimal Example, please follow these steps:

Tip: Clone everything in /tmp if you don't want to keep them on your drive.

1. Clone the node locally

git clone --depth 1  https://github.com/webb-tools/dkg-substrate.git

then check out the commit where we updated Substrate:

git checkout 1192013487c9580dcfb1656b504f486bb29c8592

2. Build the node into release mode (should take less than 10min).

cargo build --release -p dkg-standalone-node

3. Then, Run the script that will run (3 nodes, for bootstrapping)

./scripts/run-standalone.sh

4. once it is working, you can clone the SDK and run the test

git clone --depth 1 https://github.com/webb-tools/webb-rs.git

5. Running the read_chain_nonce test

cargo test read_chain_nonce

You will get that error, similar to this:

Codec(Error { cause: None, desc: "Not enough data to fill buffer" })

Meta

Substrate Version: https://github.com/paritytech/substrate/commit/9eddaec3b8f15eec0c458e7bb3a1c16db91d8199
Subxt Version: https://github.com/paritytech/subxt/commit/d99cb9f4c3b93fdf6a082f60993556016dabc90c

[shekohex]

@ascjones do you think this is related to this? paritytech/polkadot-sdk#323

[ascjones]

Hi @shekohex, just back from holiday I can take a look tomorrow at this

[ascjones]

The return type for chain_nonces is u64 https://github.com/webb-tools/webb-rs/blob/main/src/substrate/dkg_runtime.rs#L5768, where it should be u32https://github.com/webb-tools/dkg-substrate/blob/fb480df7f7fa12602e3dc3cc005e2dd96907bfbf/dkg-runtime-primitives/src/proposal.rs#L10.

Regenerating dkg_runtime.rs should fix this.

[shekohex]

Thank you very much @ascjones !

[icodezjb]

I had a similar problem.
Using the wrong or outdated polkadot.js types via polkadot.js.org.
Resolved it by cleaning and configuring the correct type