Router

The Router contract replicates the main Conditional Tokens functions, but allowing to work with ERC20 outcomes instead of the ERC1155.

Variables

conditionalTokens

contract IConditionalTokens conditionalTokens

Conditional Tokens contract.

wrapped1155Factory

contract IWrapped1155Factory wrapped1155Factory

Wrapped1155Factory contract.

Functions

constructor

constructor(contract IConditionalTokens _conditionalTokens, contract IWrapped1155Factory _wrapped1155Factory) public

Constructor.

Parameters

Name
Type
Description

_conditionalTokens

contract IConditionalTokens

Conditional Tokens contract.

_wrapped1155Factory

contract IWrapped1155Factory

Wrapped1155Factory contract.

splitPosition

function splitPosition(contract IERC20 collateralToken, contract Market market, uint256 amount) public

Transfers the collateral to the Router, splits the position and sends the ERC20 outcome tokens back to the user.

The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are deposited only if we are not splitting a deep position (market.parentCollectionId is bytes32(0)).

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to split.

amount

uint256

The amount of collateral to split.

Pre-condition

  1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.

  2. The caller must have <amount> collateral tokens or ERC20 parent outcome tokens (in the case market.parentCollectionId is not null).

Logic

When market.parentCollectionId is null:

  1. Transfer <amount> collateral from the user to Router.

  2. Call conditionalTokens.splitPosition to transfer <amount> collateral from Router to ConditionalTokens, while minting corresponding ERC1155 outcome tokens to Router.

When market.parentCollectionId is not null:

  1. Unwrap ERC20 parent outcome tokens back to ERC1155 tokens.

  2. Call conditionalTokens.splitPosition to transfer ERC1155 parent outcome tokens from Router to ConditionalTokens, burning them while minting corresponding conditional outcome tokens to Router.

Step 3 is the same in both cases:

  1. Transfer ERC1155 outcome tokens from Router to Wrapped1155Factory contract. There is a callback function in Wrapped1155Factory that will wrap the tokens into ERC20 tokens, then transfer the wrapped tokens back to the original user.

_splitPosition

function _splitPosition(contract IERC20 collateralToken, contract Market market, uint256 amount) internal

Splits a position and sends the ERC20 outcome tokens to the user.

The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to split.

amount

uint256

The amount of collateral to split.

mergePositions

function mergePositions(contract IERC20 collateralToken, contract Market market, uint256 amount) public

Merges positions and sends the collateral tokens to the user.

The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are withdrawn only if we are not merging a deep position (market.parentCollectionId is bytes32(0)).

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to merge.

amount

uint256

The amount of outcome tokens to merge.

Pre-condition

  1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.

  2. The caller must have <amount> ERC20 tokens of all the outcomes of a market. For example, to call mergePositions of a market with 3 outcomes: Yes, No, Invalid, the caller must have <amount> tokens for each outcome.

Logic

Merging positions does precisely the opposite of what splitting a position does.

  1. Unwraps ERC20 outcome tokens (which will burn these tokens and transfer corresponding ERC1155 outcome tokens back to the Router contract).

  2. Call conditionalTokens.mergePositions to burn ERC1155 outcome tokens. Then:

When market.parentCollectionId is null:

  1. Return collateral to Router , which will then be sent to the user.

When market.parentCollectionId is not null:

  1. conditionalTokens will mint ERC1155 parent outcome tokens and send to Router. Router will wrap these tokens to ERC20 and send to the user.

_mergePositions

function _mergePositions(contract IERC20 collateralToken, contract Market market, uint256 amount) internal

Merges positions and receives the collateral tokens.

Callers to this function must send the collateral to the user.

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to merge.

amount

uint256

The amount of outcome tokens to merge.

redeemPositions

function redeemPositions(contract IERC20 collateralToken, contract Market market, uint256[] outcomeIndexes, uint256[] amounts) public

Redeems positions and sends the collateral tokens to the user.

The ERC20 associated to each outcome must be previously created on the wrapped1155Factory. Collateral tokens are withdrawn only if we are not redeeming a deep position (parentCollectionId is bytes32(0)).

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to redeem.

outcomeIndexes

uint256[]

The index of the outcomes to redeem.

amounts

uint256[]

Amount to redeem of each outcome.

Pre-condition

  1. The ERC20 associated to each outcome must be previously created on the wrapped1155Factory.

  2. The caller must have ERC20 tokens of the outcomes they want to redeem. For example, to call redeemPositions for outcome Yes of a market with 3 outcomes: Yes, No, Invalid, the caller must have Yes tokens. (The call will still be processed even if the caller does not have tokens, but it will have no effect).

  3. conditionalTokens.reportPayouts has been called by an oracle.

Logic

  1. Unwraps ERC20 outcome tokens (which will burn these tokens and transfer corresponding ERC1155 outcome tokens back to the Router contract).

  2. Call conditionalTokens.redeemPositions to burn ERC1155 outcome tokens. Then:

When market.parentCollectionId is null:

  1. Return collateral to Router . The return amount is in proportion to the ConditionalTokens payouts. Router will calculate the collateral difference before and after redeeming and transfer the difference to the user.

When market.parentCollectionId is not null:

  1. conditionalTokens will mint ERC1155 parent outcome tokens and send to Router. The amount is in proportion to the ConditionalTokens payouts. Router will calculate the ERC1155 outcome tokens difference before and after redeeming, wrap the difference to ERC20 and send to the user.

_redeemPositions

function _redeemPositions(contract IERC20 collateralToken, contract Market market, uint256[] outcomeIndexes, uint256[] amounts) internal

Redeems positions and receives the collateral tokens.

Callers to this function must send the collateral to the user.

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

market

contract Market

The Market to redeem.

outcomeIndexes

uint256[]

The index of the outcomes to redeem.

amounts

uint256[]

Amount to redeem of each outcome.

getPartition

function getPartition(uint256 size) internal pure returns (uint256[])

Returns a partition containing the full set of outcomes.

Parameters

Name
Type
Description

size

uint256

Number of outcome slots.

Return Values

Name
Type
Description

[0]

uint256[]

The partition containing the full set of outcomes.

getTokenId

function getTokenId(contract IERC20 collateralToken, bytes32 parentCollectionId, bytes32 conditionId, uint256 indexSet) public view returns (uint256)

Constructs a tokenId from a collateral token and an outcome collection.

Parameters

Name
Type
Description

collateralToken

contract IERC20

The address of the ERC20 used as collateral.

parentCollectionId

bytes32

The Conditional Tokens parent collection id.

conditionId

bytes32

The id of the condition used to redeem.

indexSet

uint256

Index set of the outcome collection to combine with the parent outcome collection.

Return Values

Name
Type
Description

[0]

uint256

The token id.

getWinningOutcomes

function getWinningOutcomes(bytes32 conditionId) external view returns (bool[])

Helper function used to know the redeemable outcomes associated to a conditionId.

Parameters

Name
Type
Description

conditionId

bytes32

The id of the condition.

Return Values

Name
Type
Description

[0]

bool[]

An array of outcomes where a true value indicates that the outcome is redeemable.

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