func DecimalToString(res decimal.Decimal, min int32, max int32) string {
if res.Cmp(decimal.New(10, min)) <= 0 || res.Cmp(decimal.New(10, max)) >= 0 {
f, _ := res.Float64()
return strconv.FormatFloat(f, 'G', -1, 64)
}
return res.String()
}
func (ex *CaVirtex) PlaceOrder(mode OrderMode, amount decimal.Decimal, price decimal.Decimal, base, counter string) (status, id string, err error) {
textMode := "sell"
if mode == ORDER_BUY {
textMode = "buy"
}
resp, err := ex.AuthenticatedPost("order", map[string]string{
"currencypair": fmt.Sprintf("%s%s", base, counter),
"mode": textMode,
"amount": amount.String(),
"price": price.String(),
})
if err != nil {
return "", "", err
}
result := struct {
Status string
Message string
ApiRate int
Order struct {
Status string
ID int
}
}{}
cnt, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", "", err
}
err = json.Unmarshal(cnt, &result)
if err != nil {
return "", "", err
}
if result.Status != "ok" {
return "", "", fmt.Errorf("status=%s: %s", result.Status, result.Message)
}
return result.Order.Status, fmt.Sprintf("%d", result.Order.ID), nil
}
func handleConnection(conn net.Conn) {
var found bool
var QuoteItem QuoteCacheItem
if err != nil {
// do stuff
return
}
status := make([]byte, 100)
_, err = conn.Read(status)
if err != nil {
// do stuff
println("ERROR READ: " + err.Error())
return
}
status = bytes.Trim(status, "\x00")
inputs := strings.Split(string(status), ",")
var price decimal.Decimal
_, err := strconv.ParseBool(strings.ToLower(inputs[0]))
APIUserId := inputs[1]
stockSymbol := inputs[2]
TransId := "1"
GGuid := getNewGuid()
Guid := GGuid.String()
if len(inputs) > 3 {
TransId = inputs[3]
Guid = inputs[4]
}
QuoteItem, found = memCache[stockSymbol]
if found {
if QuoteItem.Expiration.After(time.Now()) {
fmt.Fprintf(conn, string(QuoteItem.Value)+","+QuoteItem.Expiration.String())
conn.Close()
hit = hit + 1
return
} else {
found = false
}
}
miss = miss + 1
if !found {
messages := make(chan string)
var returned bool = false
num_threads := 0
go func() {
for returned == false {
num_threads = num_threads + 1
go func() {
sendString := stockSymbol + "," + APIUserId + "\n"
addr, err := net.ResolveTCPAddr("tcp", "quoteserve.seng.uvic.ca:"+quotePort)
if err != nil {
return
}
qconn, err := net.DialTCP("tcp", nil, addr)
if err != nil {
//error
println("ERROR qconn: " + err.Error())
return
}
defer qconn.Close()
_, err = fmt.Fprintf(qconn, sendString)
if err != nil {
failOnError(err, "Error with fprintf")
}
response := make([]byte, 100)
_, err = qconn.Read(response)
returned = true
messages <- string(response)
}()
time.Sleep(time.Duration(thread_wait) * time.Millisecond)
}
}()
QuoteReturn := <-messages
ParsedQuoteReturn := strings.Split(QuoteReturn, ",")
price, err = decimal.NewFromString(ParsedQuoteReturn[0])
if err != nil {
//error
println("ERROR PARSING")
}
backoff := 50 + rand.Intn(5)
QuoteExpiration := time.Now().Add(time.Duration(backoff) * time.Second)
_, err = conn.Write([]byte(price.String() + "," + QuoteExpiration.String()))
conn.Close()
stockSymbol = ParsedQuoteReturn[1]
ReturnUserId := ParsedQuoteReturn[2]
msTimeStamp, err := msToTime(ParsedQuoteReturn[3])
if err != nil {
//error
}
cryptoKey := stripCtlAndExtFromUTF8(ParsedQuoteReturn[4])
cryptoKey = strings.TrimSpace(cryptoKey)
if ReturnUserId != APIUserId {
// system error
}
QuoteEvent := QuoteServerEvent{
EventType: "QuoteServerEvent",
Guid: Guid,
OccuredAt: time.Now(),
TransactionId: TransId,
UserId: APIUserId,
Service: "QUOTE",
Server: "QuoteCache",
Price: price.String(),
StockSymbol: stockSymbol,
QuoteServerTime: msTimeStamp,
Cryptokey: cryptoKey,
}
SendRabbitMessage(QuoteEvent, QuoteEvent.EventType)
tmpQuoteItem := QuoteCacheItem{
Expiration: QuoteExpiration,
Value: price.String(),
}
memCache[stockSymbol] = tmpQuoteItem
if err != nil {
// system error
}
for i := 0; i < num_threads-1; i++ {
<-messages
}
close(messages)
return
}
}
func Buy(w http.ResponseWriter, r *http.Request) {
zero, _ := decimal.NewFromString("0")
type buy_struct struct {
Amount string
Symbol string
}
type return_struct struct {
Error bool
SaleId int
Price string
NumShares int64
Expiration time.Duration
}
vars := mux.Vars(r)
UserId := vars["id"]
TransId := r.Header.Get("X-TransNo")
if TransId == "" {
TransId = "0"
}
decoder := json.NewDecoder(r.Body)
var t buy_struct
err := decoder.Decode(&t)
//Audit UserCommand
Guid := getNewGuid()
CommandEvent := UserCommandEvent{
EventType: "UserCommandEvent",
Guid: Guid.String(),
OccuredAt: time.Now(),
TransactionId: TransId,
UserId: UserId,
Service: "Command",
Server: Hostname,
Command: "BUY",
StockSymbol: t.Symbol,
Funds: t.Amount,
}
SendRabbitMessage(CommandEvent, CommandEvent.EventType)
//Decode Request Body
if err != nil {
writeResponse(w, http.StatusBadRequest, "Request Body Is Invalid")
return
}
//Validate Request Body
AmountDec, err := decimal.NewFromString(t.Amount)
if err != nil {
writeResponse(w, http.StatusBadRequest, "Request Body Is Invalid")
return
}
//Validate amount to buy
if AmountDec.Cmp(zero) != 1 {
writeResponse(w, http.StatusBadRequest, "Amount to buy is not a valid number")
return
}
StockId := t.Symbol
//Validate Stock Symbol
if len(StockId) == 0 || len(StockId) > 3 {
writeResponse(w, http.StatusBadRequest, "Symbol is Not Valid")
return
}
//Get and Validate Quote
var strPrice string
var strExpiration string
strPrice, strExpiration = getStockPrice(TransId, "true", UserId, StockId, Guid.String())
var quotePrice decimal.Decimal
quotePrice, err = decimal.NewFromString(strPrice)
if err != nil {
writeResponse(w, http.StatusInternalServerError, "Quote Return is not Valid")
return
}
if quotePrice.Cmp(zero) != 1 {
writeResponse(w, http.StatusBadRequest, "Amount to buy is not a valid number: "+quotePrice.String())
return
}
//Verify Expiration Time
ExpirationTime, err := time.Parse("2006-01-02 15:04:05 -0700 MST", strExpiration)
if err != nil {
writeResponse(w, http.StatusOK, "Expiration Conversion Error")
return
}
//Check If User Exists
db, uid, found, _ := getDatabaseUserId(UserId)
if found == false {
writeResponse(w, http.StatusBadRequest, "User Does Not Exist")
return
}
//Calculate Stock To Buy
toBuy := (AmountDec.Div(quotePrice)).IntPart()
//Validate Buy Amount
if toBuy < 1 {
writeResponse(w, http.StatusBadRequest, "Cannot Buy less than 1 stock")
return
}
strBuy := strconv.Itoa(int(toBuy))
//Add Pending Purchase for Amount
var PurchaseId int
rows, err := db.Query(addPendingPurchase, uid, t.Symbol, strBuy, strPrice, time.Now(), ExpirationTime)
defer rows.Close()
if err != nil {
writeResponse(w, http.StatusInternalServerError, "Failed to Create Purchase")
return
}
rows.Next()
err = rows.Scan(&PurchaseId)
if err != nil {
writeResponse(w, http.StatusBadRequest, "Sale Id Request Failed")
return
}
TimeToExpiration := (ExpirationTime.Sub(time.Now())) / time.Millisecond
//Build Response
rtnStruct := return_struct{false, PurchaseId, strPrice, toBuy, TimeToExpiration}
strRtnStruct, err := json.Marshal(rtnStruct)
//success
writeResponse(w, http.StatusOK, string(strRtnStruct))
return
}
func Quote(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
StockId := vars["symbol"]
UserId := vars["id"]
TransId := r.Header.Get("X-TransNo")
if TransId == "" {
TransId = "0"
}
//Audit UserCommand
Guid := getNewGuid()
CommandEvent := UserCommandEvent{
EventType: "UserCommandEvent",
Guid: Guid.String(),
OccuredAt: time.Now(),
TransactionId: TransId,
UserId: UserId,
Service: "Command",
Server: "B134",
Command: "QUOTE",
StockSymbol: StockId,
Funds: "",
}
SendRabbitMessage(CommandEvent, CommandEvent.EventType)
//Check Stock Symbol
if len(StockId) == 0 || len(StockId) > 3 {
writeResponse(w, http.StatusBadRequest, "Symbol is Not Valid")
return
}
//Get Stock Price
var strPrice string
strPrice, _ = getStockPrice(TransId, "false", UserId, StockId, Guid.String())
//Verify Return Price
var price decimal.Decimal
price, err := decimal.NewFromString(strPrice)
if err != nil {
writeResponse(w, http.StatusBadRequest, "Quote Return: "+err.Error())
return
}
//Success
var Output string = "The Quote For UserId " + UserId + " and StockId " + StockId + " returned " + price.String()
writeResponse(w, http.StatusOK, Output)
}