amm

package
v3.0.0 Latest Latest
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 Go to latest Published: Dec 7, 2022 License: Apache-2.0 Imports: 8 Imported by: 0

Documentation

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	MinCoinAmount = sdk.NewInt(100)
	MaxCoinAmount = sdk.NewIntWithDecimal(1, 40)
)

The minimum and maximum coin amount used in the amm package.

View Source 
var (
	MinPoolPrice               = sdk.NewDecWithPrec(1, 15)            // 10^-15
	MaxPoolPrice               = sdk.NewIntWithDecimal(1, 20).ToDec() // 10^20
	MinRangedPoolPriceGapRatio = sdk.NewDecWithPrec(1, 3)             // 0.001, 0.1%
)
View Source 
var (
	DefaultOrderer = BaseOrderer{}
)

Functions

func Deposit 

func Deposit(rx, ry, ps, x, y sdk.Int) (ax, ay, pc sdk.Int)

Deposit returns accepted x and y coin amount and minted pool coin amount when someone deposits x and y coins.

func DeriveTranslation 

func DeriveTranslation(rx, ry sdk.Int, minPrice, maxPrice sdk.Dec) (transX, transY sdk.Dec)

func DistributeOrderAmountToOrders 

func DistributeOrderAmountToOrders(orders []Order, amt sdk.Int, price sdk.Dec) (quoteCoinDiff sdk.Int)

DistributeOrderAmountToOrders distributes the given order amount to the orders proportional to each order's amount. The caller must sort orders before calling DistributeOrderAmountToOrders. After distributing the amount based on each order's proportion, remaining amount due to the decimal truncation is distributed to the orders again, by priority. This time, the proportion is not considered and each order takes up the amount as much as possible.

func DistributeOrderAmountToTick 

func DistributeOrderAmountToTick(tick *orderBookTick, amt sdk.Int, price sdk.Dec) (quoteCoinDiff sdk.Int)

DistributeOrderAmountToTick distributes the given order amount to the orders at the tick. Orders with higher priority(have lower batch id) get matched first, then the remaining amount is distributed to the remaining orders.

func DownTick 

func DownTick(price sdk.Dec, prec int) sdk.Dec

DownTick returns the next highest price tick under the price. DownTick doesn't check if the price is the lowest price tick.

func FillOrder 

func FillOrder(order Order, amt sdk.Int, price sdk.Dec) (quoteCoinDiff sdk.Int)

FillOrder fills the order by given amount and price.

func FindMatchPrice 

func FindMatchPrice(ov OrderView, tickPrec int) (matchPrice sdk.Dec, found bool)

func FulfillOrder 

func FulfillOrder(order Order, price sdk.Dec) (quoteCoinDiff sdk.Int)

FulfillOrder fills the order by its remaining open amount at given price.

func FulfillOrders 

func FulfillOrders(orders []Order, price sdk.Dec) (quoteCoinDiff sdk.Int)

FulfillOrders fills multiple orders by their remaining open amount at given price.

func HighestTick 

func HighestTick(prec int) sdk.Dec

HighestTick returns the highest possible price tick.

func InitialPoolCoinSupply 

func InitialPoolCoinSupply(x, y sdk.Int) sdk.Int

InitialPoolCoinSupply returns ideal initial pool coin minting amount.

func LowestTick 

func LowestTick(prec int) sdk.Dec

LowestTick returns the lowest possible price tick.

func MatchableAmount 

func MatchableAmount(order Order, price sdk.Dec) (matchableAmt sdk.Int)

MatchableAmount returns matchable amount of an order considering remaining offer coin and price.

func OfferCoinAmount 

func OfferCoinAmount(dir OrderDirection, price sdk.Dec, amt sdk.Int) sdk.Int

OfferCoinAmount returns the minimum offer coin amount for given order direction, price and order amount.

func PriceToDownTick 

func PriceToDownTick(price sdk.Dec, prec int) sdk.Dec

PriceToDownTick returns the highest price tick under(or equal to) the price.

func PriceToUpTick 

func PriceToUpTick(price sdk.Dec, prec int) sdk.Dec

PriceToUpTick returns the lowest price tick greater or equal than the price.

func RandomTick 

func RandomTick(r *rand.Rand, minPrice, maxPrice sdk.Dec, prec int) sdk.Dec

RandomTick returns a random tick within range [minPrice, maxPrice]. If prices are not on ticks, then prices are adjusted to the nearest ticks.

func RoundPrice 

func RoundPrice(price sdk.Dec, prec int) sdk.Dec

RoundPrice returns rounded price using banker's rounding.

func RoundTickIndex 

func RoundTickIndex(i int) int

RoundTickIndex returns rounded tick index using banker's rounding.

func SortOrders 

func SortOrders(orders []Order)

SortOrders sorts orders using its HasPriority condition.

func TickFromIndex 

func TickFromIndex(i, prec int) sdk.Dec

TickFromIndex returns a price for given tick index. See TickToIndex for more details about tick indices.

func TickGap 

func TickGap(price sdk.Dec, prec int) sdk.Dec

TickGap returns tick gap at given price.

func TickToIndex 

func TickToIndex(price sdk.Dec, prec int) int

TickToIndex returns a tick index for given price. Tick index 0 means the lowest possible price fit in ticks.

func TotalAmount 

func TotalAmount(orders []Order) sdk.Int

TotalAmount returns total amount of orders.

func TotalMatchableAmount 

func TotalMatchableAmount(orders []Order, price sdk.Dec) (amt sdk.Int)

TotalMatchableAmount returns total matchable amount of orders.

func UpTick 

func UpTick(price sdk.Dec, prec int) sdk.Dec

UpTick returns the next lowest price tick above the price.

func ValidateRangedPoolParams 

func ValidateRangedPoolParams(minPrice, maxPrice, initialPrice sdk.Dec) error

func Withdraw 

func Withdraw(rx, ry, ps, pc sdk.Int, feeRate sdk.Dec) (x, y sdk.Int)

Withdraw returns withdrawn x and y coin amount when someone withdraws pc pool coin. Withdraw also takes care of the fee rate.

Types

type BaseOrder 

type BaseOrder struct {
	Direction       OrderDirection
	Price           sdk.Dec
	Amount          sdk.Int
	OfferCoinAmount sdk.Int

	// Match info
	OpenAmount               sdk.Int
	PaidOfferCoinAmount      sdk.Int
	ReceivedDemandCoinAmount sdk.Int
}

BaseOrder is the base struct for an Order.

func NewBaseOrder 

func NewBaseOrder(dir OrderDirection, price sdk.Dec, amt, offerCoinAmt sdk.Int) *BaseOrder

NewBaseOrder returns a new BaseOrder.

func (*BaseOrder) GetAmount 

func (order *BaseOrder) GetAmount() sdk.Int

GetAmount returns the order amount.

func (*BaseOrder) GetBatchId 

func (order *BaseOrder) GetBatchId() uint64

func (*BaseOrder) GetDirection 

func (order *BaseOrder) GetDirection() OrderDirection

GetDirection returns the order direction.

func (*BaseOrder) GetOfferCoinAmount 

func (order *BaseOrder) GetOfferCoinAmount() sdk.Int

func (*BaseOrder) GetOpenAmount 

func (order *BaseOrder) GetOpenAmount() sdk.Int

func (*BaseOrder) GetPaidOfferCoinAmount 

func (order *BaseOrder) GetPaidOfferCoinAmount() sdk.Int

func (*BaseOrder) GetPrice 

func (order *BaseOrder) GetPrice() sdk.Dec

GetPrice returns the order price.

func (*BaseOrder) GetReceivedDemandCoinAmount 

func (order *BaseOrder) GetReceivedDemandCoinAmount() sdk.Int

func (*BaseOrder) HasPriority 

func (order *BaseOrder) HasPriority(other Order) bool

HasPriority returns whether the order has higher priority than the other order.

func (*BaseOrder) IsMatched 

func (order *BaseOrder) IsMatched() bool

func (*BaseOrder) SetOpenAmount 

func (order *BaseOrder) SetOpenAmount(amt sdk.Int)

func (*BaseOrder) SetPaidOfferCoinAmount 

func (order *BaseOrder) SetPaidOfferCoinAmount(amt sdk.Int)

func (*BaseOrder) SetReceivedDemandCoinAmount 

func (order *BaseOrder) SetReceivedDemandCoinAmount(amt sdk.Int)

func (*BaseOrder) String 

func (order *BaseOrder) String() string

type BaseOrderer 

type BaseOrderer struct{}

BaseOrderer creates new BaseOrder with sufficient offer coin amount considering price and amount.

func (BaseOrderer) Order 

func (orderer BaseOrderer) Order(dir OrderDirection, price sdk.Dec, amt sdk.Int) Order

type BasicPool 

type BasicPool struct {
	// contains filtered or unexported fields
}

BasicPool is the basic pool type.

func CreateBasicPool 

func CreateBasicPool(rx, ry sdk.Int) (*BasicPool, error)

func NewBasicPool 

func NewBasicPool(rx, ry, ps sdk.Int) *BasicPool

NewBasicPool returns a new BasicPool. It is OK to pass an empty sdk.Int to ps when ps is not going to be used.

func (*BasicPool) Balances 

func (pool *BasicPool) Balances() (rx, ry sdk.Int)

Balances returns the balances of the pool.

func (*BasicPool) BuyAmountOver 

func (pool *BasicPool) BuyAmountOver(price sdk.Dec, _ bool) (amt sdk.Int)

BuyAmountOver returns the amount of buy orders for price greater than or equal to given price. amt = (X - P*Y)/P

func (*BasicPool) BuyAmountTo 

func (pool *BasicPool) BuyAmountTo(price sdk.Dec) (amt sdk.Int)

BuyAmountTo returns the amount of buy orders of the pool for price, where BuyAmountTo is used when the pool price is higher than the highest price of the order book.

func (*BasicPool) Clone 

func (pool *BasicPool) Clone() Pool

func (*BasicPool) HighestBuyPrice 

func (pool *BasicPool) HighestBuyPrice() (price sdk.Dec, found bool)

HighestBuyPrice returns the highest buy price of the pool.

func (*BasicPool) IsDepleted 

func (pool *BasicPool) IsDepleted() bool

IsDepleted returns whether the pool is depleted or not.

func (*BasicPool) LowestSellPrice 

func (pool *BasicPool) LowestSellPrice() (price sdk.Dec, found bool)

LowestSellPrice returns the lowest sell price of the pool.

func (*BasicPool) PoolCoinSupply 

func (pool *BasicPool) PoolCoinSupply() sdk.Int

PoolCoinSupply returns the pool coin supply.

func (*BasicPool) Price 

func (pool *BasicPool) Price() sdk.Dec

Price returns the pool price.

func (*BasicPool) SellAmountTo 

func (pool *BasicPool) SellAmountTo(price sdk.Dec) (amt sdk.Int)

SellAmountTo returns the amount of sell orders of the pool for price, where SellAmountTo is used when the pool price is lower than the lowest price of the order book.

func (*BasicPool) SellAmountUnder 

func (pool *BasicPool) SellAmountUnder(price sdk.Dec, _ bool) (amt sdk.Int)

func (*BasicPool) SetBalances 

func (pool *BasicPool) SetBalances(rx, ry sdk.Int, _ bool)

type MultipleOrderViews 

type MultipleOrderViews []OrderView

func (MultipleOrderViews) BuyAmountOver 

func (views MultipleOrderViews) BuyAmountOver(price sdk.Dec, inclusive bool) sdk.Int

func (MultipleOrderViews) HighestBuyPrice 

func (views MultipleOrderViews) HighestBuyPrice() (price sdk.Dec, found bool)

func (MultipleOrderViews) LowestSellPrice 

func (views MultipleOrderViews) LowestSellPrice() (price sdk.Dec, found bool)

func (MultipleOrderViews) SellAmountUnder 

func (views MultipleOrderViews) SellAmountUnder(price sdk.Dec, inclusive bool) sdk.Int

type Order 

type Order interface {
	GetDirection() OrderDirection
	// GetBatchId returns the batch id where the order was created.
	// Batch id of 0 means the current batch.
	GetBatchId() uint64
	GetPrice() sdk.Dec
	GetAmount() sdk.Int // The original order amount
	GetOfferCoinAmount() sdk.Int
	GetPaidOfferCoinAmount() sdk.Int
	SetPaidOfferCoinAmount(amt sdk.Int)
	GetReceivedDemandCoinAmount() sdk.Int
	SetReceivedDemandCoinAmount(amt sdk.Int)
	GetOpenAmount() sdk.Int
	SetOpenAmount(amt sdk.Int)
	IsMatched() bool
	// HasPriority returns true if the order has higher priority
	// than the other order.
	HasPriority(other Order) bool
	String() string
}

Order is the universal interface of an order.

func PoolBuyOrders 

func PoolBuyOrders(pool Pool, orderer Orderer, lowestPrice, highestPrice sdk.Dec, tickPrec int) (orders []Order)

func PoolOrders 

func PoolOrders(pool Pool, orderer Orderer, lowestPrice, highestPrice sdk.Dec, tickPrec int) []Order

func PoolSellOrders 

func PoolSellOrders(pool Pool, orderer Orderer, lowestPrice, highestPrice sdk.Dec, tickPrec int) (orders []Order)

type OrderBook 

type OrderBook struct {
	// contains filtered or unexported fields
}

OrderBook is an order book.

func NewOrderBook 

func NewOrderBook(orders ...Order) *OrderBook

NewOrderBook returns a new OrderBook.

func (*OrderBook) AddOrder 

func (ob *OrderBook) AddOrder(orders ...Order)

AddOrder adds orders to the order book.

func (*OrderBook) BuyOrdersAt 

func (ob *OrderBook) BuyOrdersAt(price sdk.Dec) []Order

BuyOrdersAt returns buy orders at given price in the order book. Note that the orders are not sorted.

func (*OrderBook) FindMatchableAmountAtSinglePrice 

func (ob *OrderBook) FindMatchableAmountAtSinglePrice(matchPrice sdk.Dec) (matchableAmt sdk.Int, found bool)

FindMatchableAmountAtSinglePrice returns the largest matchable amount of orders when matching orders at single price(batch auction).

func (*OrderBook) FullString 

func (ob *OrderBook) FullString(tickPrec int) string

FullString returns a full string representation of the order book. FullString includes all possible price ticks from the order book's highest price to the lowest price.

Example 
ob := amm.NewOrderBook(
	newOrder(amm.Sell, utils.ParseDec("1.2"), sdk.NewInt(10000)),
	newOrder(amm.Buy, utils.ParseDec("1.17"), sdk.NewInt(10000)),
	newOrder(amm.Sell, utils.ParseDec("1.15"), sdk.NewInt(5000)),
	newOrder(amm.Sell, utils.ParseDec("1.1"), sdk.NewInt(3000)),
	newOrder(amm.Buy, utils.ParseDec("1.1"), sdk.NewInt(5000)),
	newOrder(amm.Buy, utils.ParseDec("1.1"), sdk.NewInt(1000)),
	newOrder(amm.Sell, utils.ParseDec("1.09"), sdk.NewInt(6000)),
	newOrder(amm.Sell, utils.ParseDec("1.09"), sdk.NewInt(4000)),
	newOrder(amm.Buy, utils.ParseDec("1.06"), sdk.NewInt(15000)),
)
fmt.Println(ob.FullString(2))

Output:

+--------sell--------+------------price-------------+--------buy---------+
|              10000 |         1.200000000000000000 | 0                  |
|                  0 |         1.190000000000000000 | 0                  |
|                  0 |         1.180000000000000000 | 0                  |
|                  0 |         1.170000000000000000 | 10000              |
|                  0 |         1.160000000000000000 | 0                  |
|               5000 |         1.150000000000000000 | 0                  |
|                  0 |         1.140000000000000000 | 0                  |
|                  0 |         1.130000000000000000 | 0                  |
|                  0 |         1.120000000000000000 | 0                  |
|                  0 |         1.110000000000000000 | 0                  |
|               3000 |         1.100000000000000000 | 6000               |
|              10000 |         1.090000000000000000 | 0                  |
|                  0 |         1.080000000000000000 | 0                  |
|                  0 |         1.070000000000000000 | 0                  |
|                  0 |         1.060000000000000000 | 15000              |
+--------------------+------------------------------+--------------------+

func (*OrderBook) HighestPrice 

func (ob *OrderBook) HighestPrice() (sdk.Dec, bool)

func (*OrderBook) LowestPrice 

func (ob *OrderBook) LowestPrice() (sdk.Dec, bool)

func (*OrderBook) MakeView 

func (ob *OrderBook) MakeView() *OrderBookView

func (*OrderBook) Match 

func (ob *OrderBook) Match(lastPrice sdk.Dec) (matchPrice sdk.Dec, quoteCoinDiff sdk.Int, matched bool)

Match matches orders sequentially, starting from buy orders with the highest price and sell orders with the lowest price. The matching continues until there's no more matchable orders.

func (*OrderBook) MatchAtSinglePrice 

func (ob *OrderBook) MatchAtSinglePrice(matchPrice sdk.Dec) (quoteCoinDiff sdk.Int, matched bool)

MatchAtSinglePrice matches all matchable orders(buy orders with higher(or equal) price than the price and sell orders with lower(or equal) price than the price) at the price.

func (*OrderBook) Orders 

func (ob *OrderBook) Orders() []Order

Orders returns all orders in the order book.

func (*OrderBook) PriceDirection 

func (ob *OrderBook) PriceDirection(lastPrice sdk.Dec) PriceDirection

PriceDirection returns the estimated price direction within this batch considering the last price.

func (*OrderBook) SellOrdersAt 

func (ob *OrderBook) SellOrdersAt(price sdk.Dec) []Order

SellOrdersAt returns sell orders at given price in the order book. Note that the orders are not sorted.

func (*OrderBook) String 

func (ob *OrderBook) String() string

String returns a compact string representation of the order book. String includes a tick only when there is at least one order on it.

Example 
ob := amm.NewOrderBook(
	newOrder(amm.Sell, utils.ParseDec("1.2"), sdk.NewInt(10000)),
	newOrder(amm.Buy, utils.ParseDec("1.17"), sdk.NewInt(10000)),
	newOrder(amm.Sell, utils.ParseDec("1.15"), sdk.NewInt(5000)),
	newOrder(amm.Sell, utils.ParseDec("1.1"), sdk.NewInt(3000)),
	newOrder(amm.Buy, utils.ParseDec("1.1"), sdk.NewInt(5000)),
	newOrder(amm.Buy, utils.ParseDec("1.1"), sdk.NewInt(1000)),
	newOrder(amm.Sell, utils.ParseDec("1.09"), sdk.NewInt(6000)),
	newOrder(amm.Sell, utils.ParseDec("1.09"), sdk.NewInt(4000)),
	newOrder(amm.Buy, utils.ParseDec("1.06"), sdk.NewInt(15000)),
)
fmt.Println(ob.String())

Output:

+--------sell--------+------------price-------------+--------buy---------+
|              10000 |         1.200000000000000000 | 0                  |
|                  0 |         1.170000000000000000 | 10000              |
|               5000 |         1.150000000000000000 | 0                  |
|               3000 |         1.100000000000000000 | 6000               |
|              10000 |         1.090000000000000000 | 0                  |
|                  0 |         1.060000000000000000 | 15000              |
+--------------------+------------------------------+--------------------+

type OrderBookView 

type OrderBookView struct {
	// contains filtered or unexported fields
}

func (*OrderBookView) BuyAmountOver 

func (view *OrderBookView) BuyAmountOver(price sdk.Dec, inclusive bool) sdk.Int

func (*OrderBookView) BuyAmountUnder 

func (view *OrderBookView) BuyAmountUnder(price sdk.Dec, inclusive bool) sdk.Int

func (*OrderBookView) HighestBuyPrice 

func (view *OrderBookView) HighestBuyPrice() (sdk.Dec, bool)

func (*OrderBookView) LowestSellPrice 

func (view *OrderBookView) LowestSellPrice() (sdk.Dec, bool)

func (*OrderBookView) Match 

func (view *OrderBookView) Match()

func (*OrderBookView) SellAmountOver 

func (view *OrderBookView) SellAmountOver(price sdk.Dec, inclusive bool) sdk.Int

func (*OrderBookView) SellAmountUnder 

func (view *OrderBookView) SellAmountUnder(price sdk.Dec, inclusive bool) sdk.Int

type OrderDirection 

type OrderDirection int

OrderDirection specifies an order direction, either buy or sell. 

const (
	Buy OrderDirection = iota + 1
	Sell
)

OrderDirection enumerations.

func (OrderDirection) String 

func (dir OrderDirection) String() string

type OrderGroup 

type OrderGroup struct {
	BatchId uint64
	Orders  []Order
}

OrderGroup represents a group of orders with same batch id.

func GroupOrdersByBatchId 

func GroupOrdersByBatchId(orders []Order) (groups []*OrderGroup)

GroupOrdersByBatchId groups orders by their batch id and returns a slice of OrderGroup.

type OrderView 

type OrderView interface {
	HighestBuyPrice() (sdk.Dec, bool)
	LowestSellPrice() (sdk.Dec, bool)
	BuyAmountOver(price sdk.Dec, inclusive bool) sdk.Int
	SellAmountUnder(price sdk.Dec, inclusive bool) sdk.Int
}

type Orderer 

type Orderer interface {
	Order(dir OrderDirection, price sdk.Dec, amt sdk.Int) Order
}

type Pool 

type Pool interface {
	Balances() (rx, ry sdk.Int)
	SetBalances(rx, ry sdk.Int, derive bool)
	PoolCoinSupply() sdk.Int
	Price() sdk.Dec
	IsDepleted() bool

	HighestBuyPrice() (sdk.Dec, bool)
	LowestSellPrice() (sdk.Dec, bool)
	BuyAmountOver(price sdk.Dec, inclusive bool) sdk.Int
	SellAmountUnder(price sdk.Dec, inclusive bool) sdk.Int
	BuyAmountTo(price sdk.Dec) sdk.Int
	SellAmountTo(price sdk.Dec) sdk.Int

	Clone() Pool
}

Pool is the interface of a pool.

type PriceDirection 

type PriceDirection int

PriceDirection specifies estimated price direction within this batch. 

const (
	PriceStaying PriceDirection = iota + 1
	PriceIncreasing
	PriceDecreasing
)

func (PriceDirection) String 

func (dir PriceDirection) String() string

type RangedPool 

type RangedPool struct {
	// contains filtered or unexported fields
}

func CreateRangedPool 

func CreateRangedPool(x, y sdk.Int, minPrice, maxPrice, initialPrice sdk.Dec) (pool *RangedPool, err error)

CreateRangedPool creates new RangedPool from given inputs, while validating the inputs and using only needed amount of x/y coins(the rest should be refunded).

func NewRangedPool 

func NewRangedPool(rx, ry, ps sdk.Int, minPrice, maxPrice sdk.Dec) *RangedPool

NewRangedPool returns a new RangedPool.

func (*RangedPool) Balances 

func (pool *RangedPool) Balances() (rx, ry sdk.Int)

Balances returns the balances of the pool.

func (*RangedPool) BuyAmountOver 

func (pool *RangedPool) BuyAmountOver(price sdk.Dec, _ bool) (amt sdk.Int)

BuyAmountOver returns the amount of buy orders for price greater than or equal to given price.

func (*RangedPool) BuyAmountTo 

func (pool *RangedPool) BuyAmountTo(price sdk.Dec) (amt sdk.Int)

BuyAmountTo returns the amount of buy orders of the pool for price, where BuyAmountTo is used when the pool price is higher than the highest price of the order book.

func (*RangedPool) Clone 

func (pool *RangedPool) Clone() Pool

func (*RangedPool) HighestBuyPrice 

func (pool *RangedPool) HighestBuyPrice() (price sdk.Dec, found bool)

HighestBuyPrice returns the highest buy price of the pool.

func (*RangedPool) IsDepleted 

func (pool *RangedPool) IsDepleted() bool

IsDepleted returns whether the pool is depleted or not.

func (*RangedPool) LowestSellPrice 

func (pool *RangedPool) LowestSellPrice() (price sdk.Dec, found bool)

LowestSellPrice returns the lowest sell price of the pool.

func (*RangedPool) MaxPrice 

func (pool *RangedPool) MaxPrice() sdk.Dec

func (*RangedPool) MinPrice 

func (pool *RangedPool) MinPrice() sdk.Dec

func (*RangedPool) PoolCoinSupply 

func (pool *RangedPool) PoolCoinSupply() sdk.Int

PoolCoinSupply returns the pool coin supply.

func (*RangedPool) Price 

func (pool *RangedPool) Price() sdk.Dec

Price returns the pool price.

func (*RangedPool) SellAmountTo 

func (pool *RangedPool) SellAmountTo(price sdk.Dec) (amt sdk.Int)

SellAmountTo returns the amount of sell orders of the pool for price, where SellAmountTo is used when the pool price is lower than the lowest price of the order book.

func (*RangedPool) SellAmountUnder 

func (pool *RangedPool) SellAmountUnder(price sdk.Dec, _ bool) (amt sdk.Int)

SellAmountUnder returns the amount of sell orders for price less than or equal to given price.

func (*RangedPool) SetBalances 

func (pool *RangedPool) SetBalances(rx, ry sdk.Int, derive bool)

SetBalances sets RangedPool's balances without recalculating transX and transY.

func (*RangedPool) Translation 

func (pool *RangedPool) Translation() (transX, transY sdk.Dec)

type TickPrecision 

type TickPrecision int

TickPrecision represents a tick precision.

func (TickPrecision) DownTick 

func (prec TickPrecision) DownTick(price sdk.Dec) sdk.Dec

func (TickPrecision) HighestTick 

func (prec TickPrecision) HighestTick() sdk.Dec

func (TickPrecision) LowestTick 

func (prec TickPrecision) LowestTick() sdk.Dec

func (TickPrecision) PriceToDownTick 

func (prec TickPrecision) PriceToDownTick(price sdk.Dec) sdk.Dec

func (TickPrecision) PriceToUpTick 

func (prec TickPrecision) PriceToUpTick(price sdk.Dec) sdk.Dec

func (TickPrecision) RandomTick 

func (prec TickPrecision) RandomTick(r *rand.Rand, minPrice, maxPrice sdk.Dec) sdk.Dec

func (TickPrecision) RoundPrice 

func (prec TickPrecision) RoundPrice(price sdk.Dec) sdk.Dec

func (TickPrecision) TickFromIndex 

func (prec TickPrecision) TickFromIndex(i int) sdk.Dec

func (TickPrecision) TickGap 

func (prec TickPrecision) TickGap(price sdk.Dec) sdk.Dec

func (TickPrecision) TickToIndex 

func (prec TickPrecision) TickToIndex(tick sdk.Dec) int

func (TickPrecision) UpTick 

func (prec TickPrecision) UpTick(price sdk.Dec) sdk.Dec

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