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trading.go
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trading.go
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package itbit
import (
"encoding/json"
"fmt"
"github.com/pkg/errors"
"time"
)
// OrderSide is the side of a trade.
type OrderSide string
// OrderType is the type of the order.
type OrderType string
// Currency is a crypto currency.
type Currency string
const (
// OrderSideBuy indicates a buy trade.
OrderSideBuy = OrderSide("buy")
// OrderSideSell indicates a sell trade.
OrderSideSell = OrderSide("sell")
// OrderTypeLimit indicates a limit order.
OrderTypeLimit = OrderType("limit")
// CurrencyXBT is bitcoin.
CurrencyXBT = Currency("XBT")
// CurrencyBTC is an alias for CurrencyXBT.
CurrencyBTC = CurrencyXBT
// CurrencyUSD is US Dollars
CurrencyUSD = Currency("USD")
// CurrencyEUR is Euros
CurrencyEUR = Currency("EUR")
// CurrencySGD is SGD
CurrencySGD = Currency("SGD")
)
// OrderRequest is a request to place an order on the market.
type OrderRequest struct {
Side OrderSide `json:"side"`
Type OrderType `json:"type"`
Currency Currency `json:"currency"`
Amount float64 `json:"amount,string"`
Display float64 `json:"display,string"`
Price float64 `json:"price,string"`
Instrument Symbol `json:"instrument"`
Metadata map[string]interface{} `json:"metadata,omitempty"`
ClientOrderIdentifier string `json:"clientOrderIdentifier,omitempty"`
}
// OrderResponse is a response to an order query or placement
type OrderResponse struct {
*OrderRequest
ID string `json:"id"`
WalletID string `json:"walletId"`
AmountFilled float64 `json:"amountFilled,string"`
VolumeWeightedAveragePrice float64 `json:"volumeWeightedAveragePrice,string"`
CreatedTime time.Time `json:"createdTime"`
Status string `json:"status"`
}
// NewOrder makes a new order.
func NewOrder(conf *Config, walletID string, order *OrderRequest) (*OrderResponse, error) {
if err := validateSymbol(order.Instrument); err != nil {
return nil, err
}
if err := validateOrderSide(order.Side); err != nil {
return nil, err
}
if err := validateOrderType(order.Type); err != nil {
return nil, err
}
if err := validateCryptoCurrency(order.Currency); err != nil {
return nil, err
}
resp, err := doReq(conf, "POST", fmt.Sprintf("/wallets/%s/orders", walletID), true, order)
if err != nil {
return nil, errors.Wrap(err, "requesting order creation")
}
dec := json.NewDecoder(resp)
r := &OrderResponse{
OrderRequest: &OrderRequest{},
}
if err := dec.Decode(r); err != nil {
return nil, errors.Wrap(err, "decoding response")
}
return r, nil
}
func validateCryptoCurrency(c Currency) error {
if c != CurrencyBTC {
return errors.Errorf("invalid crypto currency %s", c)
}
return nil
}
func validateFiatCurrency(c Currency) error {
switch c {
case CurrencySGD, CurrencyUSD, CurrencyEUR:
return nil
}
return errors.Errorf("invalid fiat currency %s", c)
}
func validateCurrency(c Currency) error {
switch c {
case CurrencyBTC, CurrencySGD, CurrencyUSD, CurrencyEUR:
return nil
}
return errors.Errorf("invalid currency %s", c)
}
func validateOrderType (c OrderType) error {
if c != OrderTypeLimit {
return errors.Errorf("invalid order type %s", c)
}
return nil
}
func validateOrderSide (c OrderSide) error {
if c != OrderSideBuy && c != OrderSideSell {
return errors.Errorf("invalid side %s", c)
}
return nil
}