SablierFlow

Inherits: Batch, NoDelegateCall, ISablierFlow, SablierFlowBase

See the documentation in ISablierFlow.

Functions

constructor

Emits {TransferAdmin} event.

constructor(
    address initialAdmin,
    IFlowNFTDescriptor initialNFTDescriptor
)
    ERC721("Sablier Flow NFT", "SAB-FLOW")
    SablierFlowBase(initialAdmin, initialNFTDescriptor);

Parameters

Name	Type	Description
`initialAdmin`	`address`	The address of the initial contract admin.
`initialNFTDescriptor`	`IFlowNFTDescriptor`	The address of the initial NFT descriptor.

coveredDebtOf

Returns the amount of debt covered by the stream balance, denoted in token's decimals.

Reverts if streamId references a null stream.

function coveredDebtOf(uint256 streamId) external view override notNull(streamId) returns (uint128 coveredDebt);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

depletionTimeOf

Returns the time at which the total debt exceeds stream balance. If the total debt is less than or equal to stream balance, it returns 0.

Reverts if streamId references a paused or a null stream.

function depletionTimeOf(uint256 streamId)
    external
    view
    override
    notNull(streamId)
    notPaused(streamId)
    returns (uint256 depletionTime);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

ongoingDebtScaledOf

Returns the amount of debt accrued since the snapshot time until now, denoted as a fixed-point number where 1e18 is 1 token.

Reverts if streamId references a null stream.

function ongoingDebtScaledOf(uint256 streamId)
    external
    view
    override
    notNull(streamId)
    returns (uint256 ongoingDebtScaled);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

refundableAmountOf

Returns the amount that the sender can be refunded from the stream, denoted in token's decimals.

Reverts if streamId references a null stream.

function refundableAmountOf(uint256 streamId)
    external
    view
    override
    notNull(streamId)
    returns (uint128 refundableAmount);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

statusOf

Returns the stream's status.

Reverts if streamId references a null stream.

function statusOf(uint256 streamId) external view override notNull(streamId) returns (Flow.Status status);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

totalDebtOf

Returns the total amount owed by the sender to the recipient, denoted in token's decimals.

Reverts if streamId references a null stream.

function totalDebtOf(uint256 streamId) external view override notNull(streamId) returns (uint256 totalDebt);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

uncoveredDebtOf

Returns the amount of debt not covered by the stream balance, denoted in token's decimals.

Reverts if streamId references a null stream.

function uncoveredDebtOf(uint256 streamId) external view override notNull(streamId) returns (uint256 uncoveredDebt);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

withdrawableAmountOf

Calculates the amount that the recipient can withdraw from the stream, denoted in token decimals. This is an alias for coveredDebtOf.

Reverts if streamId references a null stream.

function withdrawableAmountOf(uint256 streamId)
    external
    view
    override
    notNull(streamId)
    returns (uint128 withdrawableAmount);

Parameters

Name	Type	Description
`streamId`	`uint256`	The stream ID for the query.

Returns

Name	Type	Description
`withdrawableAmount`	`uint128`	The amount that the recipient can withdraw.

adjustRatePerSecond

Changes the stream's rate per second.

Emits {AdjustFlowStream} and {MetadataUpdate} events. Notes:

Performs a debt snapshot. Requirements:
Must not be delegate called.
streamId must not reference a null or a paused stream.
msg.sender must be the stream's sender.
newRatePerSecond must not equal to the current rate per second.

function adjustRatePerSecond(
    uint256 streamId,
    UD21x18 newRatePerSecond
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notPaused(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to adjust.
`newRatePerSecond`	`UD21x18`	The new rate per second, denoted as a fixed-point number where 1e18 is 1 token per second.

create

Creates a new Flow stream by setting the snapshot time to block.timestamp and leaving the balance to zero. The stream is wrapped in an ERC-721 NFT.

Emits {CreateFlowStream} event. Requirements:

Must not be delegate called.
sender must not be the zero address.
recipient must not be the zero address.
The token's decimals must be less than or equal to 18.

function create(
    address sender,
    address recipient,
    UD21x18 ratePerSecond,
    IERC20 token,
    bool transferable
)
    external
    override
    noDelegateCall
    returns (uint256 streamId);

Parameters

Name	Type	Description
`sender`	`address`	The address streaming the tokens, which is able to adjust and pause the stream. It doesn't have to be the same as `msg.sender`.
`recipient`	`address`	The address receiving the tokens.
`ratePerSecond`	`UD21x18`	The amount by which the debt is increasing every second, denoted as a fixed-point number where 1e18 is 1 token per second.
`token`	`IERC20`	The contract address of the ERC-20 token to be streamed.
`transferable`	`bool`	Boolean indicating if the stream NFT is transferable.

Returns

Name	Type	Description
`streamId`	`uint256`	The ID of the newly created stream.

createAndDeposit

Creates a new Flow stream by setting the snapshot time to block.timestamp and the balance to amount. The stream is wrapped in an ERC-721 NFT.

Emits {Transfer}, {CreateFlowStream}, and {DepositFlowStream} events. Notes:

Refer to the notes in {deposit}. Requirements:
Refer to the requirements in {create} and {deposit}.

function createAndDeposit(
    address sender,
    address recipient,
    UD21x18 ratePerSecond,
    IERC20 token,
    bool transferable,
    uint128 amount
)
    external
    override
    noDelegateCall
    returns (uint256 streamId);

Parameters

Name	Type	Description
`sender`	`address`	The address streaming the tokens. It doesn't have to be the same as `msg.sender`.
`recipient`	`address`	The address receiving the tokens.
`ratePerSecond`	`UD21x18`	The amount by which the debt is increasing every second, denoted as a fixed-point number where 1e18 is 1 token per second.
`token`	`IERC20`	The contract address of the ERC-20 token to be streamed.
`transferable`	`bool`	Boolean indicating if the stream NFT is transferable.
`amount`	`uint128`	The deposit amount, denoted in token's decimals.

Returns

Name	Type	Description
`streamId`	`uint256`	The ID of the newly created stream.

deposit

Makes a deposit in a stream.

Emits {Transfer} and {DepositFlowStream} events. Requirements:

Must not be delegate called.
streamId must not reference a null or a voided stream.
amount must be greater than zero.
sender and recipient must match the stream's sender and recipient addresses.

function deposit(
    uint256 streamId,
    uint128 amount,
    address sender,
    address recipient
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notVoided(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to deposit to.
`amount`	`uint128`	The deposit amount, denoted in token's decimals.
`sender`	`address`	The stream's sender address.
`recipient`	`address`	The stream's recipient address.

depositAndPause

Deposits tokens in a stream and pauses it.

Emits {Transfer}, {DepositFlowStream} and {PauseFlowStream} events. Notes:

Refer to the notes in {deposit} and {pause}. Requirements:
Refer to the requirements in {deposit} and {pause}.

function depositAndPause(
    uint256 streamId,
    uint128 amount
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notPaused(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to deposit to, and then pause.
`amount`	`uint128`	The deposit amount, denoted in token's decimals.

depositViaBroker

Deposits tokens in a stream.

Emits {Transfer} and {DepositFlowStream} events. Notes:

Refer to the notes in {deposit}. Requirements:
Must not be delegate called.
streamId must not reference a null stream.
totalAmount must be greater than zero. Otherwise it will revert inside {deposit}.
broker.account must not be 0 address.
broker.fee must not be greater than MAX_FEE. It can be zero.

function depositViaBroker(
    uint256 streamId,
    uint128 totalAmount,
    address sender,
    address recipient,
    Broker calldata broker
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notVoided(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to deposit on.
`totalAmount`	`uint128`	The total amount, including the deposit and any broker fee, denoted in token's decimals.
`sender`	`address`	The stream's sender address.
`recipient`	`address`	The stream's recipient address.
`broker`	`Broker`	Struct encapsulating (i) the address of the broker assisting in creating the stream, and (ii) the percentage fee paid to the broker from `totalAmount`, denoted as a fixed-point percentage.

pause

Pauses the stream.

Emits {PauseFlowStream} event. Notes:

It does not set the snapshot time to the current block timestamp.
It updates the snapshot debt by adding up ongoing debt.
It sets the rate per second to zero. Requirements:
Must not be delegate called.
streamId must not reference a null or an already paused stream.
msg.sender must be the stream's sender.

function pause(uint256 streamId)
    external
    override
    noDelegateCall
    notNull(streamId)
    notPaused(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to pause.

refund

Refunds the provided amount of tokens from the stream to the sender's address.

Emits {Transfer} and {RefundFromFlowStream} events. Requirements:

Must not be delegate called.
streamId must not reference a null stream.
msg.sender must be the sender.
amount must be greater than zero and must not exceed the refundable amount.

function refund(
    uint256 streamId,
    uint128 amount
)
    external
    override
    noDelegateCall
    notNull(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to refund from.
`amount`	`uint128`	The amount to refund, denoted in token's decimals.

refundAndPause

Refunds the provided amount of tokens from the stream to the sender's address.

Emits {Transfer}, {RefundFromFlowStream} and {PauseFlowStream} events. Notes:

Refer to the notes in {pause}. Requirements:
Refer to the requirements in {refund} and {pause}.

function refundAndPause(
    uint256 streamId,
    uint128 amount
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notPaused(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to refund from and then pause.
`amount`	`uint128`	The amount to refund, denoted in token's decimals.

restart

Restarts the stream with the provided rate per second.

Emits {RestartFlowStream} event.

This function updates stream's snapshotTime to the current block timestamp. Notes:
It sets the snapshot time to the current block timestamp. Requirements:
Must not be delegate called.
streamId must not reference a null, or a voided stream.
msg.sender must be the stream's sender.
ratePerSecond must be greater than zero.

function restart(
    uint256 streamId,
    UD21x18 ratePerSecond
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notVoided(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to restart.
`ratePerSecond`	`UD21x18`	The amount by which the debt is increasing every second, denoted as a fixed-point number where 1e18 is 1 token per second.

restartAndDeposit

Restarts the stream with the provided rate per second, and makes a deposit.

Emits {RestartFlowStream}, {Transfer}, and {DepositFlowStream} events. Notes:

Refer to the notes in {restart} and {deposit}. Requirements:
amount must be greater than zero.
Refer to the requirements in {restart}.

function restartAndDeposit(
    uint256 streamId,
    UD21x18 ratePerSecond,
    uint128 amount
)
    external
    override
    noDelegateCall
    notNull(streamId)
    notVoided(streamId)
    onlySender(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to restart.
`ratePerSecond`	`UD21x18`	The amount by which the debt is increasing every second, denoted as a fixed-point number where 1e18 is 1 token per second.
`amount`	`uint128`	The deposit amount, denoted in token's decimals.

void

Voids a stream.

Emits {VoidFlowStream} event. Notes:

It sets snapshot time to the block.timestamp
Voiding an insolvent stream sets the snapshot debt to the stream's balance making the uncovered debt to become zero.
Voiding a solvent stream updates the snapshot debt by adding up ongoing debt.
It sets the rate per second to zero.
A voided stream cannot be restarted. Requirements:
Must not be delegate called.
streamId must not reference a null or a voided stream.
msg.sender must either be the stream's sender, recipient or an approved third party.

function void(uint256 streamId)
    external
    override
    noDelegateCall
    notNull(streamId)
    notVoided(streamId)
    updateMetadata(streamId);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to void.

withdraw

Withdraws the provided amount minus the protocol fee to the provided to address.

Emits {Transfer} and {WithdrawFromFlowStream} events. Notes:

It sets the snapshot time to the block.timestamp if amount is greater than snapshot debt.
A protocol fee may be charged on the withdrawn amount if the protocol fee is enabled for the streaming token. Requirements:
Must not be delegate called.
streamId must not reference a null stream.
to must not be the zero address.
to must be the recipient if msg.sender is not the stream's recipient.
amount must be greater than zero and must not exceed the withdrawable amount.

function withdraw(
    uint256 streamId,
    address to,
    uint128 amount
)
    external
    override
    noDelegateCall
    notNull(streamId)
    updateMetadata(streamId)
    returns (uint128 withdrawnAmount, uint128 protocolFeeAmount);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to withdraw from.
`to`	`address`	The address receiving the withdrawn tokens.
`amount`	`uint128`	The amount to withdraw, denoted in token's decimals.

Returns

Name	Type	Description
`withdrawnAmount`	`uint128`	The amount withdrawn to the recipient, denoted in token's decimals. This is input amount minus the protocol fee.
`protocolFeeAmount`	`uint128`	The protocol fee amount, denoted in the token's decimals.

withdrawMax

Withdraws the entire withdrawable amount minus the protocol fee to the provided to address.

Emits {Transfer} and {WithdrawFromFlowStream} events. Notes:

Refer to the notes in {withdraw}. Requirements:
Refer to the requirements in {withdraw}.

function withdrawMax(
    uint256 streamId,
    address to
)
    external
    override
    noDelegateCall
    notNull(streamId)
    updateMetadata(streamId)
    returns (uint128 withdrawnAmount, uint128 protocolFeeAmount);

Parameters

Name	Type	Description
`streamId`	`uint256`	The ID of the stream to withdraw from.
`to`	`address`	The address receiving the withdrawn tokens.

Returns

Name	Type	Description
`withdrawnAmount`	`uint128`	The amount withdrawn to the recipient, denoted in token's decimals.
`protocolFeeAmount`	`uint128`	The protocol fee amount, denoted in the token's decimals.

_coveredDebtOf

Calculates the amount of covered debt by the stream balance.

function _coveredDebtOf(uint256 streamId) internal view returns (uint128);

_ongoingDebtScaledOf

Calculates the ongoing debt, as a 18-decimals fixed point number, accrued since last snapshot. Return 0 if the stream is paused or block.timestamp is less than or equal to snapshot time.

function _ongoingDebtScaledOf(uint256 streamId) internal view returns (uint256);

_refundableAmountOf

Calculates the refundable amount.

function _refundableAmountOf(uint256 streamId) internal view returns (uint128);

_totalDebtOf

The total debt is the sum of the snapshot debt and the ongoing debt descaled to token's decimal. This value is independent of the stream's balance.

function _totalDebtOf(uint256 streamId) internal view returns (uint256);

_uncoveredDebtOf

Calculates the uncovered debt.

function _uncoveredDebtOf(uint256 streamId) internal view returns (uint256);