# SimpleRouter

*Maker contracts using this router must make sure that the reserve approves the router for all asset that will be pulled (outbound tokens)*\
*Thus a maker contract using a vault that is not an EOA must make sure this vault has approval capacities.*

## **pull**

```solidity
function __pull__(contract IERC20 token, address owner, uint256 amount, bool strict) internal virtual returns (uint256 pulled)
```

transfers an amount of tokens from the reserve to the maker.

*requires approval from `owner` for `this` to transfer `token`.*

### Parameters

| Name   | Type            | Description                                                                       |
| ------ | --------------- | --------------------------------------------------------------------------------- |
| token  | contract IERC20 | Token to be transferred                                                           |
| owner  | address         | The account from which the tokens will be transferred.                            |
| amount | uint256         | The amount of tokens to be transferred                                            |
| strict | bool            | wether the caller maker contract wishes to pull at most `amount` tokens of owner. |

### Return Values

| Name   | Type    | Description                                                                |
| ------ | ------- | -------------------------------------------------------------------------- |
| pulled | uint256 | The amount pulled if successful (will be equal to `amount`); otherwise, 0. |

## **push**

```solidity
function __push__(contract IERC20 token, address owner, uint256 amount) internal virtual returns (uint256)
```

transfers an amount of tokens from the maker to the reserve.

### Parameters

| Name   | Type            | Description                            |
| ------ | --------------- | -------------------------------------- |
| token  | contract IERC20 | Token to be transferred                |
| owner  | address         |                                        |
| amount | uint256         | The amount of tokens to be transferred |

### Return Values

| Name | Type    | Description |
| ---- | ------- | ----------- |
| \[0] | uint256 |             |

## balanceOfReserve

```solidity
function balanceOfReserve(contract IERC20 token, address owner) public view returns (uint256)
```

Balance of a reserve

### Parameters

| Name  | Type            | Description                                 |
| ----- | --------------- | ------------------------------------------- |
| token | contract IERC20 | the asset one wishes to know the balance of |
| owner | address         |                                             |

### Return Values

| Name | Type    | Description                |
| ---- | ------- | -------------------------- |
| \[0] | uint256 | the balance of the reserve |

## **checkList**

```solidity
function __checkList__(contract IERC20 token, address owner) internal view virtual
```

router-dependent implementation of the `checkList` function\
verifies all required approval involving `this` router (either as a spender or owner)

*`checkList` returns normally if all needed approval are strictly positive. It reverts otherwise with a reason.*

### Parameters

| Name  | Type            | Description                                     |
| ----- | --------------- | ----------------------------------------------- |
| token | contract IERC20 | is the asset whose approval must be checked     |
| owner | address         | the account that requires asset pulling/pushing |


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