How to get uid based on Address and AssetId

fuel · September 15, 2023, 7:13pm

Hi guys, I’m trying to create uid based on Address and AssetId in the indexer lib file, it works well like uid(event.address) and uid(event.asset_id.0) but how to make it together?

I’m trying to store data like this:

storage {
    user_collateral: StorageMap<(Address, AssetId), u64> = StorageMap {},
}

Toolchain latest and indexer v0.20.8

Default host: aarch64-apple-darwin
fuelup home: /Users/alexey/.fuelup

installed toolchains
--------------------
beta-3-aarch64-apple-darwin
beta-4-rc.2-aarch64-apple-darwin
latest-aarch64-apple-darwin (default)
hotfix
my-custom-toolchain

active toolchain
-----------------
latest-aarch64-apple-darwin (default)
  forc : 0.44.1
    - forc-client
      - forc-deploy : 0.44.1
      - forc-run : 0.44.1
    - forc-doc : 0.44.1
    - forc-explore : 0.28.1
    - forc-fmt : 0.44.1
    - forc-index : 0.20.8
    - forc-lsp : 0.44.1
    - forc-tx : 0.44.1
    - forc-wallet : 0.3.0
  fuel-core : 0.20.4
  fuel-core-keygen : Error getting version string
  fuel-indexer : 0.20.8

fuels versions
---------------
forc : 0.45
forc-wallet : 0.45

Source code

github.com

compolabs/sway-lend/blob/beta-4/services/swaylend-indexer/src/lib.rs

extern crate alloc;
use fuel_indexer_utils::prelude::*;

#[indexer(manifest = "swaylend_indexer.manifest.yaml")]
pub mod swaylend_indexer_index_mod {

    fn handle_block(block: BlockData) {
        let height = block.height;
        let txs = block.transactions.len();
        info!("🧱 Block height: {height} | transacrions: {txs}");
    }

    fn handle_asset_collateral_event(event: AssetCollateralEvent) {
        let entry = CollateralConfigurationEntity {
            id: uid(&event.configuration.asset_id.0),
            asset_id: event.configuration.asset_id.0.into(),
            price_feed: event.configuration.price_feed,
            decimals: event.configuration.decimals,
            borrow_collateral_factor: event.configuration.borrow_collateral_factor,
            liquidate_collateral_factor: event.configuration.liquidate_collateral_factor,

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Voxelot · September 15, 2023, 7:47pm

The uid function expects a contiguous slice of bytes.

The following is not a valid way to join two separate byte arrays together in rust, as it just creates a slice of two nested slices:

[..event.address, ..event.asset_id.0]

To create a flattened byte slice from two separate slices you’ll need to concat them.

Playground example → Rust Playground

fuel · September 15, 2023, 10:32pm

Oh, sorry, stupid question, that works for me