tick.ts

path: /src/utils/tick.ts

createTick()

Params:
 - tickId (String): ID of the tick instance to create. Format: <pool address>#<tick index>
 - tickIdx (i32): Tick index
 - poolId (string): PoolId
 - event (MintEvent): The mint event where liquidity was added to the tick

ReturnType: Tick

Other-Chains

Initializes a new Tick to store the liquidity present at the specific tick.

Sets tick.id, tick.tickIdx, tick.pool and tick.poolId from the parametrs. Sets tick.creatdAtTimeStamp and tick.createdAtBlockNumber from event.block.timestamp and event.block.number respectively.

tick.price0 is calcualted as 1.0001^tickIdx and tick.price1 as safeDiv(ONE_BD, price0).

All the other parameters are initialized to ZERO_BD or ZERO_BI.

Entites:

1. Tick - Create

Dependencies:

1. ZERO_BI
2. ONE_BD
3. ZERO_BD
4. bigDecimalExponated()
5. safeDiv()

Invoked at:

1. handleMint()

Arbitrum-One

• Logic same as mainnet, except doesn't initialize the variables tick.feeGrowthOutside0X128 and tick.feeGrowthOutside1X128

createTickBurn()

Only in Optimism

This function exists only in optimism subgraph

Params:
 - tickId (String): ID of the tick instance to initialize. Format: <pool address>#<tick index>
 - tickIdx (i32): Tick index
 - poolId (string): PoolId
 - event (MintEvent): The event where the liquidity from the tick is removed

ReturnType: Tick

Instantiate a tick that already exists from previous transactions.

• Uses the same logic as createTick() to initialize a new tick entity
• Later reads the Pool contract ticks data for tickIdx and sets the tick.liquidityGross, tick.liquidityNet, tick.feeGrowthOutside0X128 and tick.feeGrowthOutside1X128 vlaues.

Entites:

1. Tick - Create * Write

ABI Dependencies:

1. pool.json

Dependencies:

1. ZERO_BI
2. ONE_BD
3. ZERO_BD
4. bigDecimalExponated()
5. safeDiv()

Invoked at:

1. handleBurn()

feeTierToTickSpacing()

Params:
 - feeTier (BigInt): The fee tier specified for the pool

ReturnType: BigInt

Other-Chains

Given a specific fee tier, returns a BigInt value for the respective tick spacing used in the pool contract.

Fee Tier	TickSpaceing Returned
10000	200
3000	60
500	10
100	1
Anything Else	Error: 'Unexpected fee tier'

Invoked at:

1. handleSwap()

Arbitrum-One

• Doesn't have the Fee Tier 100, Tick Space 1 entry.