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order.go
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order.go
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package types
import (
"sort"
sdk "github.com/cosmos/cosmos-sdk/types"
)
var (
_ Order = (*BaseOrder)(nil)
_ Order = (*UserOrder)(nil)
_ Order = (*PoolOrder)(nil)
DescendingPrice PriceComparator = func(a, b Order) bool {
return a.GetPrice().GT(b.GetPrice())
}
AscendingPrice PriceComparator = func(a, b Order) bool {
return a.GetPrice().LT(b.GetPrice())
}
)
type Order interface {
GetDirection() SwapDirection
GetPrice() sdk.Dec
GetAmount() sdk.Int
GetOpenAmount() sdk.Int
SetOpenAmount(amount sdk.Int) Order
GetOfferCoinAmount() sdk.Int
GetRemainingOfferCoinAmount() sdk.Int
SetRemainingOfferCoinAmount(amount sdk.Int) Order
GetReceivedAmount() sdk.Int
SetReceivedAmount(amount sdk.Int) Order
}
type PriceComparator func(a, b Order) bool
type Orders []Order
func (orders Orders) OpenAmount() sdk.Int {
amount := sdk.ZeroInt()
for _, order := range orders {
amount = amount.Add(order.GetOpenAmount())
}
return amount
}
func (orders Orders) Sort(cmp PriceComparator) {
sort.SliceStable(orders, func(i, j int) bool {
switch orderA := orders[i].(type) {
case *UserOrder:
switch orderB := orders[j].(type) {
case *UserOrder:
return orderA.RequestId < orderB.RequestId
case *PoolOrder:
return true
}
case *PoolOrder:
switch orderB := orders[j].(type) {
case *UserOrder:
return false
case *PoolOrder:
return orderA.PoolId < orderB.PoolId
}
}
return false // not reachable
})
sort.SliceStable(orders, func(i, j int) bool {
return orders[i].GetAmount().GT(orders[j].GetAmount())
})
sort.SliceStable(orders, func(i, j int) bool {
return cmp(orders[i], orders[j])
})
}
type BaseOrder struct {
Direction SwapDirection
Price sdk.Dec
Amount sdk.Int
OpenAmount sdk.Int
OfferCoinAmount sdk.Int
RemainingOfferCoinAmount sdk.Int
ReceivedAmount sdk.Int
}
func NewBaseOrder(dir SwapDirection, price sdk.Dec, amt, offerCoinAmt sdk.Int) *BaseOrder {
return &BaseOrder{
Direction: dir,
Price: price,
Amount: amt,
OpenAmount: amt,
OfferCoinAmount: offerCoinAmt,
RemainingOfferCoinAmount: offerCoinAmt,
ReceivedAmount: sdk.ZeroInt(),
}
}
func (order *BaseOrder) GetDirection() SwapDirection {
return order.Direction
}
func (order *BaseOrder) GetPrice() sdk.Dec {
return order.Price
}
func (order *BaseOrder) GetAmount() sdk.Int {
return order.Amount
}
func (order *BaseOrder) GetOpenAmount() sdk.Int {
return order.OpenAmount
}
func (order *BaseOrder) SetOpenAmount(amount sdk.Int) Order {
order.OpenAmount = amount
return order
}
func (order *BaseOrder) GetOfferCoinAmount() sdk.Int {
return order.OfferCoinAmount
}
func (order *BaseOrder) GetRemainingOfferCoinAmount() sdk.Int {
return order.RemainingOfferCoinAmount
}
func (order *BaseOrder) SetRemainingOfferCoinAmount(amount sdk.Int) Order {
order.RemainingOfferCoinAmount = amount
return order
}
func (order *BaseOrder) GetReceivedAmount() sdk.Int {
return order.ReceivedAmount
}
func (order *BaseOrder) SetReceivedAmount(amount sdk.Int) Order {
order.ReceivedAmount = amount
return order
}
type UserOrder struct {
BaseOrder
RequestId uint64
Orderer sdk.AccAddress
}
func NewUserOrder(req SwapRequest) *UserOrder {
return &UserOrder{
BaseOrder: BaseOrder{
Direction: req.Direction,
Price: req.Price,
Amount: req.OpenAmount,
OpenAmount: req.OpenAmount,
OfferCoinAmount: req.RemainingOfferCoin.Amount,
RemainingOfferCoinAmount: req.RemainingOfferCoin.Amount,
ReceivedAmount: sdk.ZeroInt(),
},
RequestId: req.Id,
Orderer: req.GetOrderer(),
}
}
func (order *UserOrder) SetOpenAmount(amount sdk.Int) Order {
order.BaseOrder.SetOpenAmount(amount)
return order
}
func (order *UserOrder) SetRemainingOfferCoinAmount(amount sdk.Int) Order {
order.BaseOrder.SetRemainingOfferCoinAmount(amount)
return order
}
func (order *UserOrder) SetReceivedAmount(amount sdk.Int) Order {
order.BaseOrder.SetReceivedAmount(amount)
return order
}
type PoolOrder struct {
BaseOrder
PoolId uint64
ReserveAddress sdk.AccAddress
}
func NewPoolOrder(poolId uint64, reserveAddr sdk.AccAddress, dir SwapDirection, price sdk.Dec, amt sdk.Int) *PoolOrder {
var offerCoinAmt sdk.Int
switch dir {
case SwapDirectionBuy:
offerCoinAmt = price.MulInt(amt).Ceil().TruncateInt()
case SwapDirectionSell:
offerCoinAmt = amt
}
return &PoolOrder{
BaseOrder: BaseOrder{
Direction: dir,
Price: price,
Amount: amt,
OpenAmount: amt,
OfferCoinAmount: offerCoinAmt,
RemainingOfferCoinAmount: offerCoinAmt,
ReceivedAmount: sdk.ZeroInt(),
},
PoolId: poolId,
ReserveAddress: reserveAddr,
}
}
func (order *PoolOrder) SetOpenAmount(amount sdk.Int) Order {
order.BaseOrder.SetOpenAmount(amount)
return order
}
func (order *PoolOrder) SetRemainingOfferCoinAmount(amount sdk.Int) Order {
order.BaseOrder.SetRemainingOfferCoinAmount(amount)
return order
}
func (order *PoolOrder) SetReceivedAmount(amount sdk.Int) Order {
order.BaseOrder.SetReceivedAmount(amount)
return order
}