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order.go
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order.go
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package order
import (
"fmt"
"github.com/ThisWillGoWell/stock-simulator-server/src/wires"
"github.com/ThisWillGoWell/stock-simulator-server/src/wires/sender"
"github.com/ThisWillGoWell/stock-simulator-server/src/app/log"
"github.com/ThisWillGoWell/stock-simulator-server/src/database"
"github.com/ThisWillGoWell/stock-simulator-server/src/game/level"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/effect"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/ledger"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/notification"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/portfolio"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/record"
"github.com/ThisWillGoWell/stock-simulator-server/src/objects/valuable"
)
type Order interface {
rc() chan Response
}
type Response interface {
response()
IsSuccess() bool
GetError() string
}
var orderChannel = make(chan Order, 30)
func Run() {
go func() {
for o := range orderChannel {
switch o.(type) {
case *TradeOrder:
executeTrade(o.(*TradeOrder))
case *TransferOrder:
executeTransfer(o.(*TransferOrder))
case *ProspectOrder:
calculateDetails(o.(*ProspectOrder))
}
}
}()
}
type TransferOrder struct {
ReceiverID string `json:"receiver"`
PortfolioID string `json:"giver"`
Amount int64 `json:"amount"`
ResponseChannel chan Response `json:"-"`
}
func (to *TransferOrder) rc() chan Response { return to.ResponseChannel }
/**
Purchase order represents a single order
*/
type TradeOrder struct {
ValuableID string `json:"stock_id"`
PortfolioID string `json:"portfolio"`
ExchangeID string `json:"-"`
Amount int64 `json:"amount"`
ResponseChannel chan Response `json:"-"`
}
func (po *TradeOrder) rc() chan Response { return po.ResponseChannel }
type ProspectOrder struct {
ValuableID string `json:"stock_id"`
PortfolioID string `json:"portfolio"`
ExchangeID string `json:"-"`
Amount int64 `json:"amount"`
ResponseChannel chan Response `json:"-"`
}
func (po *ProspectOrder) rc() chan Response { return po.ResponseChannel }
type BasicResponse struct {
Order Order `json:"order"`
OrderDetails Details `json:"details,omitempty"`
Success bool `json:"success"`
Err string `json:"err,omitempty"`
}
func (*BasicResponse) response() {}
func (br *BasicResponse) IsSuccess() bool { return br.Success }
func (br *BasicResponse) GetError() string { return br.Err }
type Details struct {
SharePrice int64 `json:"share_price"`
ShareCount int64 `json:"share_count"`
ShareValue int64 `json:"shares_valuere"`
Tax int64 `json:"tax"`
Fees int64 `json:"fees"`
Bonus int64 `json:"bonus"`
Result int64 `json:"result"`
ActiveEffects []string `json:"active_effects"`
}
// note this does not validate if the stock exists or not, that's done in the trade() function
func MakePurchaseOrder(valuableID, portfolioUUID string, amount int64) *TradeOrder {
po := &TradeOrder{
//ExchangeID: exchangeID,
ValuableID: valuableID,
PortfolioID: portfolioUUID,
Amount: amount,
ResponseChannel: make(chan Response, 1),
}
orderChannel <- po
return po
}
func MakeTransferOrder(giver, receiver string, amount int64) *TransferOrder {
to := &TransferOrder{
PortfolioID: giver,
ReceiverID: receiver,
Amount: amount,
ResponseChannel: make(chan Response, 1),
}
orderChannel <- to
return to
}
func MakeProspect(valuableID, portfolioUUID string, amount int64) *ProspectOrder {
po := &ProspectOrder{
//ExchangeID: exchangeID,
ValuableID: valuableID,
PortfolioID: portfolioUUID,
Amount: amount,
ResponseChannel: make(chan Response, 1),
}
orderChannel <- po
return po
}
func successOrder(o Order, details Details) {
o.rc() <- &BasicResponse{
OrderDetails: details,
Order: o,
Success: true}
}
func failureOrder(msg string, o Order) {
o.rc() <- &BasicResponse{
Order: o,
Success: false,
Err: msg,
}
}
// validate and make a trade
// Purchase Order contains a reference to the order
// use failureTrade() and successTrade to send response down channel
// Don't need to a lock around this since the portfolio holds it for that trade
func executeTrade(o *TradeOrder) {
//get the stock if it exists
//valuable.ValuablesLock.EnableDebug()
//ledger.EntriesLock.EnableDebug()
var err error
valuable.ValuablesLock.Acquire("trade")
value, exists := valuable.Stocks[o.ValuableID]
if !exists {
valuable.ValuablesLock.Release()
failureOrder("asset is not recognized", o)
return
}
// lock the object for the rest of the trade
value.GetLock().Acquire("trade")
defer value.GetLock().Release()
valuable.ValuablesLock.Release()
portfolio.PortfoliosLock.Acquire("trade")
port, exists := portfolio.Portfolios[o.PortfolioID]
if !exists {
portfolio.PortfoliosLock.Release()
failureOrder("portfolio does not exist, this is very bad", o)
return
}
//lock the portfolio for the rest of the trade
port.Lock.Acquire("trade")
defer port.Lock.Release()
portfolio.PortfoliosLock.Release()
// get the ledger or make a new one
ledger.EntriesLock.Acquire("trade")
ledger.NewEntriesLock.Acquire("trade")
ledgerEntry, ledgerExists := ledger.EntriesStockPortfolio[o.ValuableID][o.PortfolioID]
if !ledgerExists {
defer ledger.NewEntriesLock.Release()
} else {
ledger.NewEntriesLock.Release()
ledgerEntry.Lock.Acquire("trade")
defer ledgerEntry.Lock.Release()
}
ledger.EntriesLock.Release()
// no need to aquire lock here, nothing changed or added
tradeEffects, activeEffects := effect.TotalTradeEffect(port.Uuid)
details := Details{}
if o.Amount > 0 {
//we have a buy
// are there enough shares
if value.OpenShares < o.Amount {
failureOrder("not enough open shares", o)
return
}
details = calculateBuyDetails(o.Amount, value, tradeEffects, activeEffects)
// does the user have enough money
if details.Result > port.Wallet {
failureOrder("not enough $$", o)
return
}
totalShareCountOwned := o.Amount
if ledgerExists {
totalShareCountOwned += ledgerEntry.Amount
}
if totalShareCountOwned > level.Levels[port.Level].MaxSharesStock {
failureOrder("can't own that many shares", o)
return
}
} else {
if !ledgerExists {
failureOrder("not enough shares", o)
return
}
// we have a sell
//make sure they have that many shares
if ledgerEntry.Amount < o.Amount {
failureOrder("not enough shares", o)
return
}
details = calculateSellDetails(o.Amount, value, ledgerEntry.RecordBookId, tradeEffects, activeEffects)
}
// update/create the ledger
if !ledgerExists {
// todo acquire lock when its made
ledgerEntry, err = ledger.NewLedgerEntry(o.PortfolioID, o.ValuableID)
if err != nil {
log.Log.Errorf("err during ledger create err=[%v]", err)
failureOrder(fmt.Sprintf("Opps! Something went wrong 0x043"), o)
return
}
} else {
ledgerEntry.Amount += o.Amount
}
record.RecordsLock.Acquire("trade")
defer record.RecordsLock.Release()
// make the record
r, book := record.NewRecord(ledgerEntry.RecordBookId, details.ShareCount, details.SharePrice, details.Tax, details.Fees, details.Bonus, details.Result)
// make the notification
note := notification.DoneTradeNotification(port.Uuid, value.Uuid, o.Amount)
// make the trade
port.Wallet += details.Result
value.OpenShares -= o.Amount
if dbErr := database.Db.Execute([]interface{}{port.Portfolio, value.Stock, ledgerEntry.Ledger, r.Record, note}, nil); dbErr != nil {
// undo the trade
port.Wallet -= details.Result
value.OpenShares += o.Amount
ledgerEntry.Amount -= o.Amount
record.DeleteRecord(r.Uuid, true)
if ledgerEntry.Amount == 0 {
ledger.DeleteLedger(ledgerEntry, true)
}
notification.DeleteNotification(note)
record.DeleteRecord(r.Uuid, true)
log.Log.Errorf("failed to make trade err=[%v]", err)
failureOrder("Oops! something went wrong!", o)
return
}
// we have committed the stuff to the database, offer to all downstream listeners
if !ledgerExists {
port.UpdateInput.RegisterInput(value.UpdateChannel.GetBufferedOutput(100))
port.UpdateInput.RegisterInput(ledgerEntry.UpdateChannel.GetBufferedOutput(1000))
wires.LedgerNewObject.Offer(ledgerEntry.Ledger)
wires.BookNewObject.Offer(book.Book)
} else {
wires.BookUpdate.Offer(book.Book)
ledgerEntry.UpdateChannel.Offer(ledgerEntry.Ledger)
}
value.UpdateChannel.Offer(value.Stock)
go port.Update()
// send the new objects
sender.SendNewObject(port.Uuid, note)
wires.RecordsNewObject.Offer(r)
successOrder(o, details)
}
func calculateDetails(order *ProspectOrder) {
response := &BasicResponse{Order: order}
valuable.ValuablesLock.Acquire("prospect")
v, ok := valuable.Stocks[order.ValuableID]
if !ok {
valuable.ValuablesLock.Release()
response.Err = "valuable id not found"
return
}
// lock for rest
v.GetLock().Acquire("prospect")
defer v.GetLock().Release()
valuable.ValuablesLock.Release()
portfolio.PortfoliosLock.Acquire("prospect")
port, ok := portfolio.Portfolios[order.PortfolioID]
if !ok {
portfolio.PortfoliosLock.Release()
response.Err = "portfolio id not found"
return
}
port.Lock.Acquire("calculate-order-details")
defer port.Lock.Release()
portfolio.PortfoliosLock.Release()
tradeEffect, activeEffects := effect.TotalTradeEffect(order.PortfolioID)
var ledgerEntry *ledger.Entry
recordUuid := ""
if order.Amount > 0 {
response.Success = true
response.OrderDetails = calculateBuyDetails(order.Amount, v, tradeEffect, activeEffects)
order.ResponseChannel <- response
return
}
ledgerPortfolio, ledgerExists := ledger.EntriesPortfolioStock[order.PortfolioID]
if ledgerExists {
ledgerEntry, ledgerExists = ledgerPortfolio[v.Uuid]
}
if !ledgerExists || ledgerEntry == nil {
response.Err = "can't calculate sell order for ledger that does not exist"
order.ResponseChannel <- response
return
}
if ledgerEntry.Amount < order.Amount*-1 {
response.Err = "don't own that many shares"
order.ResponseChannel <- response
return
}
recordUuid = ledgerEntry.RecordBookId
response.Success = true
response.OrderDetails = calculateSellDetails(order.Amount, v, recordUuid, tradeEffect, activeEffects)
order.ResponseChannel <- response
}
func calculateBuyDetails(amount int64, v *valuable.Stock, tradeEffect *effect.TradeEffect, activeTradeEffects []string) Details {
d := Details{
SharePrice: v.CurrentPrice,
ShareCount: amount,
ShareValue: v.CurrentPrice * amount,
Tax: 0,
Fees: int64(float64(*tradeEffect.BuyFeeAmount) * *tradeEffect.BuyFeeMultiplier),
Bonus: 0,
Result: v.CurrentPrice * amount * -1,
ActiveEffects: activeTradeEffects,
}
d.Result = d.ShareValue*-1 - d.Fees
return d
}
func calculateSellDetails(amount int64, v *valuable.Stock, recordUuid string, tradeEffect *effect.TradeEffect, activeTradeEffects []string) Details {
d := Details{
SharePrice: v.CurrentPrice,
ShareCount: amount,
ShareValue: v.CurrentPrice * amount * -1,
ActiveEffects: activeTradeEffects,
}
principle := record.GetPrinciple(recordUuid, amount*-1)
pbt := d.ShareValue - principle
taxes := 0.0
if pbt > 0 {
taxes = float64(pbt) * *tradeEffect.TaxPercent
d.Bonus = int64(float64(pbt) * *tradeEffect.BonusProfitMultiplier)
}
fees := int64(float64(*tradeEffect.SellFeeAmount) * *tradeEffect.SellFeeMultiplier)
d.Tax = int64(taxes)
d.Fees = int64(fees)
d.Result = d.ShareValue - d.Tax - d.Fees + d.Bonus
return d
}
func executeTransfer(o *TransferOrder) {
if o.ReceiverID == o.PortfolioID {
failureOrder("cant transfer to and from same user", o)
return
}
portfolio.PortfoliosLock.Acquire("transfer money")
port, exists := portfolio.Portfolios[o.PortfolioID]
if !exists {
portfolio.PortfoliosLock.Release()
failureOrder("giver portfolio not known", o)
return
}
receiver, exists := portfolio.Portfolios[o.ReceiverID]
if !exists {
portfolio.PortfoliosLock.Release()
failureOrder("receiver portolio not found und", o)
return
}
// lock the lock both portfolios for the rest of the trade
port.Lock.Acquire("transfer")
defer port.Lock.Release()
receiver.Lock.Acquire("transfer")
defer receiver.Lock.Release()
portfolio.PortfoliosLock.Release()
if port.Level == 0 {
failureOrder("need to be level 1 to transfer money", o)
return
}
if o.Amount <= 0 {
failureOrder("invalid amount", o)
return
}
if o.Amount > port.Wallet {
failureOrder("not enough money", o)
return
}
receiver.Wallet += o.Amount
port.Wallet -= o.Amount
notification.NotificationLock.Acquire("transfer")
defer notification.NotificationLock.Release()
n1, n2 := notification.SendMoneyTradeNotification(port.Uuid, receiver.Uuid, o.Amount)
// commit the changes to the database
if dbErr := database.Db.Execute([]interface{}{n1.Notification, n2.Notification, receiver.Portfolio, port.Portfolio}, nil); dbErr != nil {
// undo the transfer
receiver.Wallet -= o.Amount
port.Wallet += o.Amount
notification.DeleteNotification(n1)
notification.DeleteNotification(n2)
log.Log.Errorf("failed to write to database send money err=[%v]", dbErr)
failureOrder("Oops! something went wrong", o)
return
}
successOrder(o, Details{})
sender.SendNewObject(port.Uuid, n1)
sender.SendNewObject(receiver.Uuid, n2)
go port.Update()
go receiver.Update()
}