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Function Documentation

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This commit is contained in:
Greg Hysen
2018-12-04 16:07:45 -08:00
parent 2be9b1ff08
commit 58a382d9b6
2 changed files with 96 additions and 59 deletions
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126
packages/contracts/contracts/extensions/BalanceThresholdFilter/MixinBalanceThresholdFilterCore.sol
View File

@@ -24,6 +24,28 @@ import "./mixins/MBalanceThresholdFilterCore.sol";
contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
/// @dev Executes an Exchange transaction iff the maker and taker meet
/// the hold at least `BALANCE_THRESHOLD` of the asset `THRESHOLD_ASSET` OR
/// the exchange function is a cancellation.
/// Supported Exchange functions:
/// - batchFillOrdersNoThrow
/// - batchFillOrKillOrders
/// - fillOrder
/// - fillOrderNoThrow
/// - fillOrKillOrder
/// - marketBuyOrders
/// - marketBuyOrdersNoThrow
/// - marketSellOrders
/// - marketSellOrdersNoThrow
/// - matchOrders
/// - cancelOrder
/// - batchCancelOrders
/// - cancelOrdersUpTo
/// Trying to call any other exchange function will throw.
/// @param salt Arbitrary number to ensure uniqueness of transaction hash.
/// @param signerAddress Address of transaction signer.
/// @param signedExchangeTransaction AbiV2 encoded calldata.
/// @param signature Proof of signer transaction by signer.
function executeTransaction(
uint256 salt,
address signerAddress,
@@ -44,25 +66,29 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
);
}
/// @dev Validates addresses meet the balance threshold specified by `BALANCE_THRESHOLD`
/// for the asset `THRESHOLD_ASSET`. If one address does not meet the thresold
/// then this function will revert. Which addresses are validated depends on
/// which Exchange function is to be called (defined by `signedExchangeTransaction` above).
/// No parameters are taken as this function reads arguments directly from calldata, to save gas.
/// If all addresses are valid then this function emits a ValidatedAddresses event, listing all
/// of the addresses whose balance thresholds it checked.
function validateBalanceThresholdsOrRevert()
internal
{
// Addresses that are validated below.
address[] memory validatedAddresses;
/**
* Do not add variables after this point.
* The assembly block may overwrite their values.
*/
///// Do not add variables after this point. /////
///// The assembly block may overwrite their values. /////
// Validate addresses
assembly {
/**
* Emulates the `calldataload` opcode on the embedded Exchange calldata,
* which is accessed through `signedExchangeTransaction`.
* @param offset - Offset into the Exchange calldata.
* @return value - Corresponding 32 byte value stored at `offset`.
*/
/// @dev Emulates the `calldataload` opcode on the embedded Exchange calldata,
/// which is accessed through `signedExchangeTransaction`.
/// @param offset - Offset into the Exchange calldata.
/// @return value - Corresponding 32 byte value stored at `offset`.
function exchangeCalldataload(offset) -> value {
// Pointer to exchange transaction
// 0x04 for calldata selector
@@ -77,23 +103,19 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
value := calldataload(exchangeCalldataOffset)
}
/**
* Convenience function that skips the 4 byte selector when loading
* from the embedded Exchange calldata.
* @param offset - Offset into the Exchange calldata (minus the 4 byte selector)
* @return value - Corresponding 32 byte value stored at `offset` + 4.
*/
/// @dev Convenience function that skips the 4 byte selector when loading
/// from the embedded Exchange calldata.
/// @param offset - Offset into the Exchange calldata (minus the 4 byte selector)
/// @return value - Corresponding 32 byte value stored at `offset` + 4.
function loadExchangeData(offset) -> value {
value := exchangeCalldataload(add(offset, 0x4))
}
/**
* A running list is maintained of addresses to validate.
* This function records an address in this array.
* @param addressToValidate - Address to record for validation.
* @note - Variables are scoped but names are not, so we append
* underscores to names that share the global namespace.
*/
/// @dev A running list is maintained of addresses to validate.
/// This function records an address in this array.
/// @param addressToValidate - Address to record for validation.
/// @note - Variables are scoped but names are not, so we append
/// underscores to names that share the global namespace.
function recordAddressToValidate(addressToValidate) {
// Compute `addressesToValidate` memory offset
let addressesToValidate_ := mload(0x40)
@@ -108,24 +130,20 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
mstore(add(addressesToValidate_, offset), addressToValidate)
}
/**
* Extracts the maker address from an order stored in the Exchange calldata
* (which is embedded in `signedExchangeTransaction`), and records it in
* the running list of addresses to validate.
* @param orderParamIndex - Index of the order in the Exchange function's signature
*/
/// @dev Extracts the maker address from an order stored in the Exchange calldata
/// (which is embedded in `signedExchangeTransaction`), and records it in
/// the running list of addresses to validate.
/// @param orderParamIndex - Index of the order in the Exchange function's signature
function recordMakerAddressFromOrder(orderParamIndex) {
let orderPtr := loadExchangeData(orderParamIndex)
let makerAddress := loadExchangeData(orderPtr)
recordAddressToValidate(makerAddress)
}
/**
* Extracts the maker addresses from an array of orders stored in the Exchange calldata
* (which is embedded in `signedExchangeTransaction`), and records them in
* the running list of addresses to validate.
* @param orderArrayParamIndex - Index of the order array in the Exchange function's signature
*/
/// @dev Extracts the maker addresses from an array of orders stored in the Exchange calldata
/// (which is embedded in `signedExchangeTransaction`), and records them in
/// the running list of addresses to validate.
/// @param orderArrayParamIndex - Index of the order array in the Exchange function's signature
function recordMakerAddressesFromOrderArray(orderArrayParamIndex) {
let orderArrayPtr := loadExchangeData(orderArrayParamIndex)
let orderArrayLength := loadExchangeData(orderArrayPtr)
@@ -138,11 +156,9 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
}
}
/**
* Records address of signer in the running list of addresses to validate.
* @note: We cannot access `signerAddress` directly from within the asm function,
* so it is loaded from the calldata.
*/
/// @dev Records address of signer in the running list of addresses to validate.
/// @note: We cannot access `signerAddress` directly from within the asm function,
/// so it is loaded from the calldata.
function recordSignerAddress() {
// Load the signer address from calldata
// 0x04 for selector
@@ -151,11 +167,9 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
recordAddressToValidate(signerAddress_)
}
/**
* Records addresses to be validated when Exchange transaction is a batch fill variant.
* This is one of: batchFillOrders, batchFillOrKillOrders, batchFillNoThrow
* Reference signature<T>: <batchFillVariant>(Order[],uint256[],bytes[])
*/
/// @dev Records addresses to be validated when Exchange transaction is a batch fill variant.
/// This is one of: batchFillOrders, batchFillOrKillOrders, batchFillNoThrow
/// Reference signature<T>: <batchFillVariant>(Order[],uint256[],bytes[])
function recordAddressesForBatchFillVariant() {
// Record maker addresses from order array (parameter index 0)
// The signer is the taker for these orders and must also be validated.
@@ -163,11 +177,9 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
recordSignerAddress()
}
/**
* Records addresses to be validated when Exchange transaction is a fill order variant.
* This is one of: fillOrder, fillOrKillOrder, fillOrderNoThrow
* Reference signature<T>: <fillOrderVariant>(Order,uint256,bytes)
*/
/// @dev Records addresses to be validated when Exchange transaction is a fill order variant.
/// This is one of: fillOrder, fillOrKillOrder, fillOrderNoThrow
/// Reference signature<T>: <fillOrderVariant>(Order,uint256,bytes)
function recordAddressesForFillOrderVariant() {
// Record maker address from the order (param index 0)
// The signer is the taker for this order and must also be validated.
@@ -175,11 +187,9 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
recordSignerAddress()
}
/**
* Records addresses to be validated when Exchange transaction is a market fill variant.
* This is one of: marketBuyOrders, marketBuyOrdersNoThrow, marketSellOrders, marketSellOrdersNoThrow
* Reference signature<T>: <marketFillInvariant>(Order[],uint256,bytes[])
*/
/// @dev Records addresses to be validated when Exchange transaction is a market fill variant.
/// This is one of: marketBuyOrders, marketBuyOrdersNoThrow, marketSellOrders, marketSellOrdersNoThrow
/// Reference signature<T>: <marketFillInvariant>(Order[],uint256,bytes[])
function recordAddressesForMarketFillVariant() {
// Record maker addresses from order array (parameter index 0)
// The signer is the taker for these orders and must also be validated.
@@ -187,10 +197,8 @@ contract MixinBalanceThresholdFilterCore is MBalanceThresholdFilterCore {
recordSignerAddress()
}
/**
* Records addresses to be validated when Exchange transaction is matchOrders.
* Reference signature: matchOrders(Order,Order)
*/
/// @dev Records addresses to be validated when Exchange transaction is matchOrders.
/// Reference signature: matchOrders(Order,Order)
function recordAddressesForMatchOrders() {
// Record maker address from both orders (param indices 0 & 1).
// The signer is the taker and must also be validated.

29
packages/contracts/contracts/extensions/BalanceThresholdFilter/mixins/MBalanceThresholdFilterCore.sol
View File

@@ -32,6 +32,28 @@ contract MBalanceThresholdFilterCore {
address[] addresses
);
/// @dev Executes an Exchange transaction iff the maker and taker meet
/// the hold at least `BALANCE_THRESHOLD` of the asset `THRESHOLD_ASSET` OR
/// the exchange function is a cancellation.
/// Supported Exchange functions:
/// - batchFillOrdersNoThrow
/// - batchFillOrKillOrders
/// - fillOrder
/// - fillOrderNoThrow
/// - fillOrKillOrder
/// - marketBuyOrders
/// - marketBuyOrdersNoThrow
/// - marketSellOrders
/// - marketSellOrdersNoThrow
/// - matchOrders
/// - cancelOrder
/// - batchCancelOrders
/// - cancelOrdersUpTo
/// Trying to call any other exchange function will throw.
/// @param salt Arbitrary number to ensure uniqueness of transaction hash.
/// @param signerAddress Address of transaction signer.
/// @param signedExchangeTransaction AbiV2 encoded calldata.
/// @param signature Proof of signer transaction by signer.
function executeTransaction(
uint256 salt,
address signerAddress,
@@ -40,5 +62,12 @@ contract MBalanceThresholdFilterCore {
)
external;
/// @dev Validates addresses meet the balance threshold specified by `BALANCE_THRESHOLD`
/// for the asset `THRESHOLD_ASSET`. If one address does not meet the thresold
/// then this function will revert. Which addresses are validated depends on
/// which Exchange function is to be called (defined by `signedExchangeTransaction` above).
/// No parameters are taken as this function reads arguments directly from calldata, to save gas.
/// If all addresses are valid then this function emits a ValidatedAddresses event, listing all
/// of the addresses whose balance thresholds it checked.
function validateBalanceThresholdsOrRevert() internal;
}