Remove Liquidity

Remove liquidity is occurs in one asset. Let's have an example of Gas Token Index Pool (all native assets of each supported chain) with the following weights:

Asset	Weight Points	Share
BNB	1000	0,1428 %
AVAX	1000	0,1428 %
ETH	1000	0,1428 %
MATIC	1000	0,1428 %
FTM	1000	0,1428 %
ETH (arbitrum)	1000	0,1428 %
ETH (optimism)	1000	0,1428 %

Total Weight = 1000 * 7 = 7000

When Liquidity Provider wants to redeem his LPs for some token - you need to choose one of the asset to be used for redeem. Let's choose ETH once again.

1. Liquidity Provider calls removeLiquidity() method on MasterCommunicator.sol on Avalanche network (considering as masterchain)

2. MasterCommunicator.sol finds InterswapPool.sol by poolID using Factory.sol: - Reduces reserves of ETH in the pool state. - Reduces the weight of the ETH in the pool using formula in Dynamic Weights - Burns LP's. - Calculate the amount of token to be withdrawn.

3. MasterCommunicator.sol sends a LayerZero message to ChildCommunicator.sol on Ethereum network with the following payload:

{    
    uint8 method, // REMOVE_LIQUIDITY_TYPE = 3
    uint256 poolId, // id of the pool, genesis pool = 0
    address token, // token to receive in exchange for LP
    uint256 amount, // amount of token
    address from, // msg.sender
    address to, // address of receiver, token will be sended who
    bytes memory data // arbitrary data for post-action integrations
}

4. ChildCommunicator.sol receives a message, calls a Lock.sol by the address (the Lock.sol address is determined by the poolID). And it unlocks ETH to receiver.

Let's take that ETH weight was decreased for 50 points. After removing liquidity we can see such a picture of pool structure:

Asset	Weight Points	Share
BNB	1000	0,1438 %
AVAX	1000	0,1438 %
ETH	950	0,1366 %
MATIC	1000	0,1438 %
FTM	1000	0,1438 %
ETH (arbitrum)	1000	0,1438 %
ETH (optimism)	1000	0,1438 %

Total Weight = 6950