https://github.com/y-pakorn/cw-storage-gas-meter

A simple CosmWasm storage gas meter for estimating gas usage from kv store.
https://github.com/y-pakorn/cw-storage-gas-meter

cosmos cosmwasm rust

Last synced: about 1 month ago
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A simple CosmWasm storage gas meter for estimating gas usage from kv store.

• Host: GitHub
• URL: https://github.com/y-pakorn/cw-storage-gas-meter
• Owner: y-pakorn
• License: gpl-3.0
• Created: 2022-07-28T08:28:35.000Z (over 2 years ago)
• Default Branch: master
• Last Pushed: 2022-07-28T17:24:34.000Z (over 2 years ago)
• Last Synced: 2024-09-14T01:32:33.453Z (2 months ago)
• Topics: cosmos, cosmwasm, rust
• Language: Rust
• Homepage:
• Size: 36.1 KB
• Stars: 5
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Simple Storage Gas Meter



    

        

    

    

        

    

    



A simple CosmWasm storage gas meter for estimating gas usage from kv store.

## Usage

### Unit Test

Use `MemoryStorageWithGas` instead of `MemoryStorage` or `MockStorage`.

```rust

// let mut storage = MockStorage::new();

let mut storage = MemoryStorageWithGas::new();

let map = Map::>::new("0");

let data = b"hello";

map.save(&mut storage, 0, &data.to_vec())?;

let gas = storage.last_gas_used();

assert_eq!(gas, 2960);

```

### Multi Test

Instantiate `cw_multi_test::App` with `MemoryStorageWithGas` instead of `MemoryStorage` or `MockStorage`.

Due to the nature of `cosmwasm_std::Storage` trait, we cannot downcast the `dyn Storage` back to `MemoryStorage` directly.

So we pass the pointer to the storage as trait object instead and access the gas log through that pointer.

```rust

let storage = MemoryStorageWithGas::new();

AppBuilder::new()

    .with_storage(&storage) // <- ref ptr here

    .build(|r, _, storage| {

        r.bank

            .init_balance(

                storage,

                &Addr::unchecked("admin"),

                vec![Coin::new(100, "uluna")],

            )

            .unwrap();

    });

let gas = storage.last_gas_used();

assert_eq!(gas, 3650);

```