Multiple Liquidity Pools with Fixed Trading Pairs

To store multiple liquidity pools with fixed trading pairs, we can use a StorageMap:

#[pallet::storage]
pub type TradingPairBalances<T: Config> = StorageMap<_, Blake2_128Concat, (AssetId, AssetId), (Balance, Balance), ValueQuery>;

Here, we define a StorageMap called TradingPairBalances that maps a tuple of (AssetId, AssetId) representing a trading pair to a tuple of (Balance, Balance) representing the balances of each asset in the liquidity pool. The Blake2_128Concat hasher is used for key hashing.

Drawbacks:

• Fixed trading pairs limit the flexibility of adding new trading pairs dynamically.
• Requires manual management of trading pair mappings.