Storage

This section provides an in-depth exploration of key data structures integral to the Invariant protocol's storage mechanism. These structs are specifically crafted to facilitate the sharing of the state of the exchange within the CLAMM model. These data structures play a pivotal role in maintaining and organizing information related to the exchange, ensuring efficient and organized handling of data.

Contract State

#[ink::storage_item]
#[derive(Debug)]
pub struct InvariantConfig {
    pub admin: AccountId,
    pub protocol_fee: Percentage,
}

Name	Type	Description
admin	AccountId	Account address of protocol admin. Admin is able to change fee, claim protocol fee or set the fee receiver, but cannot interfere with user positions or deposits and cannot close the pool.
protocol_fee	Percentage	Percentage of the fee collected upon every swap in the pool that goes to the protocol, rest goes to LP.

FeeTier

#[derive(scale::Decode, scale::Encode)]
#[cfg_attr(
    feature = "std",
    derive(scale_info::TypeInfo, ink::storage::traits::StorageLayout)
)]
pub struct FeeTier {
    pub fee: Percentage,
    pub tick_spacing: u16,
}

Name	Type	Description
fee	Percentage	Percentage of the fee collected upon every swap in the pool.
tick_spacing	u16	The spacing between usable ticks.

PoolKey

#[derive(scale::Decode, scale::Encode, Debug, Copy, Clone, PartialEq)]
#[cfg_attr(
    feature = "std",
    derive(scale_info::TypeInfo, ink::storage::traits::StorageLayout)
)]
pub struct PoolKey {
    pub token_x: AccountId,
    pub token_y: AccountId,
    pub fee_tier: FeeTier,
}

Name	Type	Description
token_x	AccountId	The address of x token.
token_y	AccountId	The address of y token.
fee_tier	FeeTier	FeeTier associated with pool.

Pool

#[derive(scale::Decode, scale::Encode)]
#[cfg_attr(
    feature = "std",
    derive(scale_info::TypeInfo, ink::storage::traits::StorageLayout)
)]
pub struct Pool {
    pub liquidity: Liquidity,
    pub sqrt_price: SqrtPrice,
    pub current_tick_index: i32,
    pub fee_growth_global_x: FeeGrowth,
    pub fee_growth_global_y: FeeGrowth,
    pub fee_protocol_token_x: TokenAmount,
    pub fee_protocol_token_y: TokenAmount,
    pub start_timestamp: u64,
    pub last_timestamp: u64,
    pub fee_receiver: AccountId,
    pub seconds_per_liquidity_global: SecondsPerLiquidity,
}

Name	Type	Description
liquidity	Liquidity	Amount of virtual liquidity on pool. The difference between virtual and actual liquidity reflect the increased capital efficiency in Invariant.
sqrt_price	SqrtPrice	Square root of current price.
current_tick_index	i32	The nearest tick below the current price.
fee_growth_global_x	FeeGrowth	Amount of fees accumulated in x token in per one integer unit of Liquidity since pool initialization.
fee_growth_global_y	FeeGrowth	Amount of fees accumulated in y token in per one integer unit of Liquidity since pool initialization.
fee_protocol_token_x	TokenAmount	Amount of protocol tokens accumulated in x token that are available to claim.
fee_protocol_token_y	TokenAmount	Amount of protocol tokens accumulated in y token that are available to claim.
start_timestamp	u64	Time of pool initialization.
last_timestamp	u64	Last update of pool.
fee_receiver	AccountId	Address of entity enabling to claim protocol fee. By default it's admin but can be change for specific pool.
seconds_per_liquidity_global	SecondsPerLiquidity	The amount of time the pool existed divided by pools liquidity

Position

#[derive(scale::Decode, scale::Encode)]
#[cfg_attr(
    feature = "std",
    derive(scale_info::TypeInfo, ink::storage::traits::StorageLayout)
)]
pub struct Position {
    pub pool_key: PoolKey,
    pub liquidity: Liquidity,
    pub lower_tick_index: i32,
    pub upper_tick_index: i32,
    pub fee_growth_inside_x: FeeGrowth,
    pub fee_growth_inside_y: FeeGrowth,
    pub last_block_number: u64,
    pub tokens_owed_x: TokenAmount,
    pub tokens_owed_y: TokenAmount,
    pub seconds_per_liquidity_inside: SecondsPerLiquidity,
    pub created_at: u64,
}

Name	Type	Description
pool_key	PoolKey	Pool key indicating on which Pool the position has been opened.
liquidity	Liquidity	Amount of immutable virtual liquidity that the position represents.
lower_tick_index	i32	Lower tick index of the Position.
upper_tick_index	i32	Upper tick index of the Position.
fee_growth_inside_x	FeeGrowth	Amount of fees accumulated in x token per one integer unit of Liquidity in-range. It is used to determine the shares of collected fees.
fee_growth_inside_y	FeeGrowth	Amount of fees accumulated in y token per one integer unit of Liquidity in-range. It is used to determine the shares of collected fees.
last_block_number	u64	Last update of position expressed in block number.
tokens_owed_x	TokenAmount	The quantity of x tokens collected in fees that is available for claiming.
tokens_owed_y	TokenAmount	The quantity of y tokens collected in fees that is available for claiming.
seconds_per_liquidity_inside	SecondsPerLiquidity	Amount of time that the price was within liquidity range of the position divided by positions liquidity
created_at	u64	Creation timestamp.

Tick

#[derive(scale::Decode, scale::Encode)]
#[cfg_attr(
    feature = "std",
    derive(scale_info::TypeInfo, ink::storage::traits::StorageLayout)
)]
pub struct Tick {
    pub index: i32,
    pub sign: bool,
    pub liquidity_change: Liquidity,
    pub liquidity_gross: Liquidity,
    pub sqrt_price: SqrtPrice,
    pub fee_growth_outside_x: FeeGrowth,
    pub fee_growth_outside_y: FeeGrowth,
    pub seconds_outside: u64,
    pub seconds_per_liquidity_outside: SecondsPerLiquidity,
}

Name	Type	Description
index	i32	Index of tick.
sign	bool	Determine if the liquidity will be added or subtracted on cross.
liquidity_change	Liquidity	Amount of virtual liquidity to adjust while. crossing.
liquidity_gross	Liquidity	Amount of virtual liquidity to be added on the tick, excluding liquidity taken on that tick. It is used to impose the maximum liquidity that can be place on a single tick.
sqrt_price	SqrtPrice	Square root of tick price.
fee_growth_outside_x	FeeGrowth	Amount of Fees accumulated in x token outside-range.
fee_growth_outside_y	FeeGrowth	Amount of Fees accumulated in y token outside-range.
seconds_outside	u64	Seconds outside-range.
seconds_per_liquidity_outside	SecondsPerLiquidity	Amount of time that the price was past the index divided by pools liquidity.

Contract State​

FeeTier​

PoolKey​

Pool​

Position​

Tick​