# Operator Staking Pool

The `OperatorStakingPool` tracks node operator LST balances for the purpose of differentiating from community LST balances. Node operators are required to stake their LSTs into this contract.

## View Functions

### lst

Returns the address of the liquid staking token supported by this pool

```solidity
function lst() external view returns (address)
```

#### Return Values

| Name | Type    | Description    |
| ---- | ------- | -------------- |
| lst  | address | address of LST |

### depositLimit

Returns the max amount of deposits per operator

```solidity
function depositLimit() external view returns (uint256)
```

#### Return Values

| Name         | Type    | Description                         |
| ------------ | ------- | ----------------------------------- |
| depositLimit | uint256 | max amount of deposits per operator |

### getOperators

Returns a list of all operators

```solidity
function getOperators() external view returns (address[])
```

#### Return Values

| Name      | Type       | Description       |
| --------- | ---------- | ----------------- |
| operators | address\[] | list of operators |

### getOperatorPrincipal

Returns an operator's principal staked balance

```solidity
function getOperatorPrincipal(address _operator) public view returns (uint256)
```

#### Parameters

| Name       | Type    | Description         |
| ---------- | ------- | ------------------- |
| \_operator | address | address of operator |

#### Return Values

| Name              | Type    | Description                      |
| ----------------- | ------- | -------------------------------- |
| operatorPrincipal | uint256 | operator principal staked amount |

### getOperatorStaked

Returns an operator's total staked balance

```solidity
function getOperatorStaked(address _operator) public view returns (uint256)
```

#### Parameters

| Name       | Type    | Description         |
| ---------- | ------- | ------------------- |
| \_operator | address | address of operator |

#### Return Values

| Name           | Type    | Description            |
| -------------- | ------- | ---------------------- |
| operatorStaked | uint256 | operator staked amount |

### getTotalPrincipal

Returns the total principal staked amount

```solidity
function getTotalPrincipal() external view returns (uint256)
```

#### Return Values

| Name           | Type    | Description                   |
| -------------- | ------- | ----------------------------- |
| totalPrincipal | uint256 | total principal staked amount |

### getTotalStaked

Returns the total staked amount

```solidity
function getTotalStaked() external view returns (uint256)
```

#### Return Values

| Name        | Type    | Description         |
| ----------- | ------- | ------------------- |
| totalStaked | uint256 | total staked amount |

### isOperator

Returns whether an account is an operator

```solidity
function isOperator(address _account) public view returns (bool)
```

#### Return Values

| Name       | Type | Description                                  |
| ---------- | ---- | -------------------------------------------- |
| isOperator | bool | true if account is operator, false otherwise |

## Write Functions

### onTokenTransfer

ERC677 implementation to receive deposits

```solidity
function onTokenTransfer(address _sender, uint256 _value, bytes) external
```

#### Parameters

| Name     | Type    | Description                 |
| -------- | ------- | --------------------------- |
| \_sender | address | address of sender           |
| \_value  | uint256 | amount of tokens to deposit |
|          | bytes   |                             |

### withdraw

Withdraws tokens

```solidity
function withdraw(uint256 _amount) external
```

#### Parameters

| Name     | Type    | Description        |
| -------- | ------- | ------------------ |
| \_amount | uint256 | amount to withdraw |

### addOperators

Adds new operators

```solidity
function addOperators(address[] _operators) external
```

#### Parameters

| Name        | Type       | Description              |
| ----------- | ---------- | ------------------------ |
| \_operators | address\[] | list of operators to add |

### removeOperators

Removes existing operators

```solidity
function removeOperators(address[] _operators) external
```

#### Parameters

| Name        | Type       | Description                 |
| ----------- | ---------- | --------------------------- |
| \_operators | address\[] | list of operators to remove |

### setDepositLimit

Sets the max amount of deposits per operator

```solidity
function setDepositLimit(uint256 _depositLimit) external
```

#### Parameters

| Name           | Type    | Description                         |
| -------------- | ------- | ----------------------------------- |
| \_depositLimit | uint256 | max amount of deposits per operator |


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