feat: add support for OCO orders

README.md

@@ -19,7 +19,7 @@ Ultra-fast matching engine written in TypeScript
 
 - Standard price-time priority
 - Supports both market and limit orders
-- Supports conditional orders (Stop Market and Stop Limit)
+- Supports conditional orders (Stop Market, Stop Limit and OCO)
 - Supports time in force GTC, FOK and IOC
 - Supports order cancelling
 - Supports order price and/or size updating
@@ -57,14 +57,16 @@ const lob = new OrderBook()
 Then you'll be able to use next primary functions:
 
 ```js
-lob.createOrder({ type: 'limit' | 'market' | 'stop_limit' | 'stop_market', side: 'buy' | 'sell', size: number, price?: number, id?: string, stopPrice?: number, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
+lob.createOrder({ type: 'limit' | 'market' | 'stop_limit' | 'stop_market' | 'oco', side: 'buy' | 'sell', size: number, price?: number, id?: string, stopPrice?: number, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
 
 lob.limit({ id: string, side: 'buy' | 'sell', size: number, price: number, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
 
 lob.market({ side: 'buy' | 'sell', size: number })
 
 lob.stopLimit({ id: string, side: 'buy' | 'sell', size: number, price: number, stopPrice: number, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
 
+lob.oco({ id: string, side: 'buy' | 'sell', size: number, price: number, stopPrice: number, stopLimitPrice: number, timeInForce?: 'GTC' | 'FOK' | 'IOC', stopLimitTimeInForce?: 'GTC' | 'FOK' | 'IOC' })
+
 lob.stopMarket({ side: 'buy' | 'sell', size: number, stopPrice: number })
 
 lob.modify(orderID: string, { side: 'buy' | 'sell', size: number, price: number })
@@ -79,17 +81,20 @@ To add an order to the order book you can call the general `createOrder()` funct
 ### Create Order
 
 ```js
-// Create a limit order
+// Create limit order
 createOrder({ type: 'limit', side: 'buy' | 'sell', size: number, price: number, id: string, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
 
-// Create a market order
+// Create market order
 createOrder({ type: 'market', side: 'buy' | 'sell', size: number })
 
-// Create a stop limit order
+// Create stop limit order
 createOrder({ type: 'stop_limit', side: 'buy' | 'sell', size: number, price: number, id: string, stopPrice: number, timeInForce?: 'GTC' | 'FOK' | 'IOC' })
 
-// Create a stop market order
+// Create stop market order
 createOrder({ type: 'stop_market', side: 'buy' | 'sell', size: number, stopPrice: number })
+
+// Create OCO order
+createOrder({ type: 'oco', side: 'buy' | 'sell', size: number, stopPrice: number, stopLimitPrice: number, timeInForce?: 'GTC' | 'FOK' | 'IOC', stopLimitTimeInForce?: 'GTC' | 'FOK' | 'IOC' })
 ```
 
 ### Create Limit Order
@@ -228,6 +233,35 @@ stopLimit({ side: 'buy' | 'sell', id: string, size: number, price: number, stopP
 stopMarket({ side: 'buy' | 'sell', size: number, stopPrice: number })
 ```
 
+### Create OCO (One-Cancels-the-Other) Order
+
+```js
+/**
+ * Create an OCO (One-Cancels-the-Other) order.
+ * OCO order combines a `stop_limit` order and a `limit` order, where if stop price
+ * is triggered or limit order is fully or partially fulfilled, the other is canceled.
+ * Both orders have the same `side` and `size`. If you cancel one of the orders, the
+ * entire OCO order pair will be canceled.
+ *
+ * For BUY orders the `stopPrice` must be above the current price and the `price` below the current price
+ * For SELL orders the `stopPrice` must be below the current price and the `price` above the current price
+ *
+ * See {@link OCOOrderOptions} for details.
+ *
+ * @param options
+ * @param options.side - `sell` or `buy`
+ * @param options.id - Unique order ID
+ * @param options.size - How much of currency you want to trade in units of base currency
+ * @param options.price - The price of the `limit` order at which the order is to be fullfilled, in units of the quote currency
+ * @param options.stopPrice - The price at which the `stop_limit` order will be triggered.
+ * @param options.stopLimitPrice - The price of the `stop_limit` order at which the order is to be fullfilled, in units of the quote currency.
+ * @param options.timeInForce - Time-in-force of the `limit` order. Type supported are: GTC, FOK, IOC. Default is GTC
+ * @param options.stopLimitTimeInForce - Time-in-force of the `stop_limit` order. Type supported are: GTC, FOK, IOC. Default is GTC
+ * @returns An object with the result of the processed order or an error. See {@link IProcessOrder} for the returned data structure
+ */
+oco({ side: 'buy' | 'sell', id: string, size: number, price: number, stopPrice: number, stopLimitPrice: number, timeInForce?: 'GTC' | 'FOK' | 'IOC', stopLimitTimeInForce?: 'GTC' | 'FOK' | 'IOC' })
+```
+
 ### Modify an existing order
 
 ```js

src/errors.ts

@@ -1,13 +1,13 @@
 export enum ERROR {
   Default = 'Something wrong',
   ErrInsufficientQuantity = 'orderbook: insufficient quantity to calculate price',
+  ErrInvalidConditionalOrder = 'orderbook: Stop-Limit Order (BUY: marketPrice < stopPrice <= price, SELL: marketPrice > stopPrice >= price). Stop-Market Order (BUY: marketPrice < stopPrice, SELL: marketPrice > stopPrice). OCO order (BUY: price < marketPrice < stopPrice, SELL: price > marketPrice > stopPrice)',
   ErrInvalidOrderType = "orderbook: supported order type are 'limit' and 'market'",
   ErrInvalidPrice = 'orderbook: invalid order price',
   ErrInvalidPriceLevel = 'orderbook: invalid order price level',
   ErrInvalidPriceOrQuantity = 'orderbook: invalid order price or quantity',
   ErrInvalidQuantity = 'orderbook: invalid order quantity',
   ErrInvalidSide = "orderbook: given neither 'bid' nor 'ask'",
-  ErrInvalidStopPrice = 'orderbook: Invalid Stop Price. For Stop-Limit Order (BUY: marketPrice < stopPrice <= price, SELL: marketPrice > stopPrice >= price). For Stop-Market Order (BUY: marketPrice < stopPrice, SELL: marketPrice > stopPrice)',
   ErrInvalidTimeInForce = "orderbook: supported time in force are 'GTC', 'IOC' and 'FOK'",
   ErrLimitFOKNotFillable = 'orderbook: limit FOK order not fillable',
   ErrOrderExists = 'orderbook: order already exists',
@@ -33,8 +33,8 @@ export const CustomError = (error?: ERROR | string): Error => {
       return new Error(ERROR.ErrOrderNotFound)
     case ERROR.ErrInvalidSide:
       return new Error(ERROR.ErrInvalidSide)
-    case ERROR.ErrInvalidStopPrice:
-      return new Error(ERROR.ErrInvalidStopPrice)
+    case ERROR.ErrInvalidConditionalOrder:
+      return new Error(ERROR.ErrInvalidConditionalOrder)
     case ERROR.ErrInvalidOrderType:
       return new Error(ERROR.ErrInvalidOrderType)
     case ERROR.ErrInvalidTimeInForce:

src/order.ts

@@ -75,12 +75,15 @@ export class LimitOrder extends BaseOrder {
   private _price: number
   private readonly _timeInForce: TimeInForce
   private readonly _isMaker: boolean
+  // Refers to the linked Stop Limit order stopPrice
+  private readonly _ocoStopPrice?: number
   constructor (options: InternalLimitOrderOptions) {
     super(options)
     this._type = options.type
     this._price = options.price
     this._timeInForce = options.timeInForce
     this._isMaker = options.isMaker
+    this._ocoStopPrice = options.ocoStopPrice
   }
 
   // Getter for order type
@@ -108,6 +111,10 @@ export class LimitOrder extends BaseOrder {
     return this._isMaker
   }
 
+  get ocoStopPrice (): number | undefined {
+    return this._ocoStopPrice
+  }
+
   toString = (): string =>
     `${this._id}:
     type: ${this.type}
@@ -170,7 +177,7 @@ export class StopMarketOrder extends BaseOrder {
     side: this._side,
     size: this._size,
     origSize: this._origSize,
-    stopPrice: this.stopPrice,
+    stopPrice: this._stopPrice,
     time: this._time
   })
 }
@@ -181,13 +188,16 @@ export class StopLimitOrder extends BaseOrder {
   private readonly _stopPrice: number
   private readonly _timeInForce: TimeInForce
   private readonly _isMaker: boolean
+  // It's true when there is a linked Limit Order
+  private readonly _isOCO: boolean
   constructor (options: InternalStopLimitOrderOptions) {
     super(options)
     this._type = options.type
     this._price = options.price
     this._stopPrice = options.stopPrice
     this._timeInForce = options.timeInForce
     this._isMaker = options.isMaker
+    this._isOCO = options.isOCO ?? false
   }
 
   // Getter for order type
@@ -220,6 +230,11 @@ export class StopLimitOrder extends BaseOrder {
     return this._isMaker
   }
 
+  // Getter for order isOCO
+  get isOCO (): boolean {
+    return this._isOCO
+  }
+
   toString = (): string =>
     `${this._id}:
     type: ${this.type}
@@ -241,8 +256,8 @@ export class StopLimitOrder extends BaseOrder {
     size: this._size,
     origSize: this._origSize,
     price: this._price,
-    stopPrice: this.stopPrice,
-    timeInForce: this.timeInForce,
+    stopPrice: this._stopPrice,
+    timeInForce: this._timeInForce,
     time: this._time,
     isMaker: this._isMaker
   })