class VirtualMarket(object):
""" Used to evaluates price at which a market order of given volume would be executed
Since this query might be computationally expensive and done asynchronously,
we wrap function OrderQueue.evaluateOrderPrice by this class.
The result will returned in on_matched event with empty 'other' field
TBD: we make use of on_matched machinery since that is supported in RemoteBook
but i'm not sure that it is a good design decision.
"""
def __init__(self, side, volume):
self.volume = volume
self.side = side
self.on_matched = Event()
self.on_charged = Event()
def copyTo(self, dst):
pass # we might copy here the total price
def processIn(self, orderBook):
def callback((price, volume_unmatched)):
self.on_matched.fire(self, None, (price, self.volume - volume_unmatched))
orderBook.evaluateOrderPriceAsync(self.side, self.volume, callback)
@staticmethod
def Buy(volume): return VirtualMarket(Side.Buy, volume)
@staticmethod
def Sell(volume): return VirtualMarket(Side.Sell, volume)
def __init__(self, tickSize=1, book=None):
""" Initializes an empty queue with given tickSize
and remembers order book the queue belong to if any
"""
self._tickSize = tickSize # tick size
self._book = book # book the queue belongs to if any
self.on_best_changed = Event() # event to be called when the best order changes
self.on_order_cancelled = Event() # event (orderQueue, cancelledOrder) to be called when an order is cancelled
self.reset()
def __init__(self, queue, book, link):
self._queue = queue
self.book = book
self._link = link
self._onBestChanged = bind.Method(self, '_onBestChanged_impl')
queue.on_best_changed += self._onBestChanged
self.on_best_changed = Event()
self.reset()
def __init__(self, side, volume):
""" Initializes order by volume to trade
"""
self._volume = volume
self._side = side
self._cancelled = False
self._PnL = 0
# TODO: these events should be replaces by a reference to the trader
# but in that case we'll have to introduce proxy classes for
# remote book and virtual orders but it is ok
self.on_matched = Event()
self.on_charged = Event()
class Queue(object):
def __init__(self, queue, book, link):
self._queue = queue
self.book = book
self._link = link
self._onBestChanged = bind.Method(self, '_onBestChanged_impl')
queue.on_best_changed += self._onBestChanged
self.on_best_changed = Event()
self.reset()
def reset(self):
self._best = self._queue.best
self._lastT = 0
@property
def side(self):
return self._queue.side
@property
def lastPrice(self):
return self._best.price if self._best is not None else None
def _update_impl(self, best):
self._best = best
self.on_best_changed.fire(self)
def _onBestChanged_impl(self, queue):
best = queue.best
self._link.send(bind.Method(self, '_update_impl', best))
@property
def best(self):
return self._best
@property
def empty(self):
return self._best is None
class Queue(object):
""" Queue of limit orders at one side (Sell or Buy).
It is implemented over a heap so has following comlexity for operations:
- pushing order: O(logN)
- accessing to the best order: O(1)
- popping the best order: O(logN)
"""
def __init__(self, tickSize=1, book=None):
""" Initializes an empty queue with given tickSize
and remembers order book the queue belong to if any
"""
self._tickSize = tickSize # tick size
self._book = book # book the queue belongs to if any
self.on_best_changed = Event() # event to be called when the best order changes
self.on_order_cancelled = Event() # event (orderQueue, cancelledOrder) to be called when an order is cancelled
self.reset()
def reset(self):
self._elements = [] # pairs ((signedTicks, arrivalSeqNo), order) kept in a heap
self._counter = 0 # arrival order counter
self._lastBest = None # pair (bestPrice, bestVolume)
self._lastPrice = None # last valid price
@property
def book(self):
""" Book the queue belongs to if any
"""
return self._book
def notifyIfBestChanged(self):
"""Notifies order queue listeners if the best order has changed
"""
best = self.best
bestpv = None if best is None else (best.price, best.volume)
if bestpv != self._lastBest:
self._lastBest = bestpv
if bestpv != None:
self._lastPrice = bestpv[0]
self.on_best_changed.fire(self)
@property
def lastPrice(self):
return self._lastPrice
def __str__(self):
return type(self).__name__ + "(" + str(self._elements) + ")"
def __repr__(self):
return self.__str__()
def ticks(self, price):
""" Corrects 'price' with respect to the tick size
Returns signed integer number of ticks for the price
and corrected unsigned order price
"""
ticks = int(math.ceil(self.side.makePriceSigned(price) / self._tickSize))
return (+ticks, self.side.makePriceSigned(ticks * self._tickSize))
def push(self, order):
""" Pushes 'order' into the queue.
May correct limit price of the order with respect to the tick size
May notify listeners about that the best order changed
"""
(ticks, correctedPrice) = self.ticks(order.price)
if order.price != correctedPrice:
# save corrected price in the order if needed
order.price = correctedPrice
heapq.heappush(self._elements, ((ticks, self._counter), order))
self._counter += 1
# notify listeners if the best order changed
self.notifyIfBestChanged()
def cancelOrder(self, order):
""" To be called when 'order' is marked as cancelled
Notifies 'on_order_cancelled' event listeners.
May fire 'on_best_changed' event
"""
order.cancel()
self._makeValid()
self.notifyIfBestChanged()
self.on_order_cancelled.fire(self, order)
def _makeValid(self):
""" Ensures that the queue is either empty or has a valid order on top
Valid order == not empty and not cancelled
Returns True iff the queue is not empty
"""
while self._elements != []:
(_, top) = self._elements[0]
if top.empty or top.cancelled:
heapq.heappop(self._elements)
else:
return True
return False
@property
def empty(self):
""" Returns True iff queue is empty
May remove invalid orders from it
"""
return not self._makeValid()
@property
def best(self):
""" Returns the best order if any
Otherwise returns None
"""
return self._elements[0][1] if self._makeValid() else None
def matchWith(self, other):
""" Matches an order against our order queue
Returns True iff the incoming order is matched completely
The order is considered as market order for the moment
May notify listeners if the best order changed
"""
# while there are orders
while not self.empty:
# take the best one
(_, top) = self._elements[0]
# match the incoming order with our best one
# and if our best order becomes empty,
if not other.empty and top.matchWith(other):
# remove it from the queue
self._makeValid()
else:
# our best order is not matched completely
break
self.notifyIfBestChanged()
return other.empty
@property
def sorted(self):
""" Enumerates orders in order of their price
Enumeration best M orders requires O(MlogM) operations
"""
if self._elements <> []:
def nth(i):
return (self._elements[i][0], i)
grey = [nth(0)]
while grey <> []:
(_, idx) = heapq.heappop(grey)
yield self._elements[idx][1]
if idx * 2 + 1 < len(self._elements):
heapq.heappush(grey, nth(idx * 2 + 1))
if idx * 2 + 2 < len(self._elements):
heapq.heappush(grey, nth(idx * 2 + 2))
@property
def sortedPVs(self):
lastPV = (None, None)
for x in self.sorted:
if not x.cancelled and not x.empty:
if x.price == lastPV[0]:
lastPV = (x.price, lastPV[1] + x.volume)
else:
if lastPV[0] is not None:
yield lastPV
lastPV = (x.price, x.volume)
if lastPV[0] is not None:
yield lastPV
def evaluateOrderPrice(self, volume):
""" Evaluates price for a potential market order with given 'volume'
Returns pair (price, volume_unmatched) where 'volume_unmatched' may be positive
if there is not enough volume in the order queue
Complexity of the operation: O(MlogM) where M - number of orders involved
"""
price = 0
for x in self.sorted:
if volume > 0:
v = min(volume, x.volume)
price += x.price * v
volume -= v
else:
break
return (price, volume)
def getVolumePrices(self, volumes):
deltas = [volumes[0]] + [volumes[i] - volumes[i-1] for i in range(1, len(volumes))]
i = 0
lastPrice = None
for x in self.sorted:
v = x.volume
lastPrice = x.price
while i < len(deltas) and v > 0:
if v > deltas[i]:
yield (volumes[i], x.price)
v -= deltas[i]
i += 1
else:
deltas[i] -= v
break
if i == len(deltas):
return
if i < len(deltas):
yield (volumes[i], lastPrice)
i += 1
while i < len(deltas):
yield (volumes[i], None)
i += 1
def withPricesBetterThan(self, limit, idx=0):
""" Enumerates orders with price better than or equal to 'limit'
"""
if len(self._elements) <= idx:
return
if not self.side.better(limit, self._elements[idx][1].price):
yield self._elements[idx][1]
for x in self.withPricesBetterThan(limit, idx * 2 + 1):
yield x
for x in self.withPricesBetterThan(limit, idx * 2 + 2):
yield x
def volumeWithPriceBetterThan(self, limit):
""" Returns total volume of orders having price better than or equal to 'limit'
"""
return sum([x.volume for x in self.withPricesBetterThan(limit)])
def __init__(self, intervalFunc):
Event.__init__(self)
self._wakeUp = bind.Method(self, '_wakeUp_impl')
self.intervalFunc = intervalFunc
self._cancelled = False
def __init__(self, side, volume):
self.volume = volume
self.side = side
self.on_matched = Event()
self.on_charged = Event()
def __init__(self, orderbook):
Event.__init__(self)
self.orderbook = orderbook
def __init__(self, trader):
Event.__init__(self)
self.trader = trader
class Base(object):
""" Base class for market and limit orders.
Responsible for:
- tracking order's volume
- tracking order's P&L
- keeping order cancellation flag (does it needed for market orders???)
- notifying order listeners about order matching
TBD: split into Cancelable, HavingVolume base classes
"""
def __init__(self, side, volume):
""" Initializes order by volume to trade
"""
self._volume = volume
self._side = side
self._cancelled = False
self._PnL = 0
# TODO: these events should be replaces by a reference to the trader
# but in that case we'll have to introduce proxy classes for
# remote book and virtual orders but it is ok
self.on_matched = Event()
self.on_charged = Event()
@property
def side(self):
return self._side
def copyTo(self, dst):
dst._volume = self._volume
dst._side = self._side
dst._PnL = self._PnL
dst._cancelled = self._cancelled
def __str__(self):
return type(self).__name__ + "("+self._side+", volume=" + str(self.volume) + ", P&L="+str(self.PnL)+")"
def __repr__(self):
return self.__str__()
@property
def volume(self):
""" Volume to trade
"""
return self._volume
@property
def PnL(self):
""" P&L of the order.
positive, if it is a sell side order
negative, if it is a buy side order
"""
return self.side.makePriceSigned(self._PnL)
@property
def empty(self):
""" Volume is empty iff its volume is 0
"""
return self.volume == 0
@property
def cancelled(self):
""" Is order cancelled
"""
return self._cancelled
def cancel(self):
""" Marks order as cancelled. Notifies the order book about it
"""
self._cancelled = True
#--------------------------------- these methods are to be called by order book
def charge(self, price):
self.on_charged.fire(price)
def onMatchedWith(self, other, (price,volume)):
""" Called when the order is matched with another order
other - other order
price - price at which the match was done
volume - volume of the match.
In this method we correct order volume and P&L
and notify order listener about the match
"""
self._volume -= volume
self._PnL += volume * price
#print "OrderMatched:", self, other, (price, volume)
self.on_matched.fire(self, other, (price, volume))
