feat: amm market depth perf - only calculate levels if they change an…

datanode/service/market_depth.go

@@ -49,6 +49,62 @@ type ammCache struct {
 	ammOrders      map[string][]*types.Order   // map amm id -> expanded orders, so we can remove them if amended
 	activeAMMs     map[string]entities.AMMPool // map amm id -> amm definition, so we can refresh its expansion
 	estimatedOrder map[string]struct{}         // order-id -> whether it was an estimated order
+
+	// the lowest/highest bounds of all AMMs
+	lowestBound  num.Decimal
+	highestBound num.Decimal
+
+	// reference -> calculation levels, if the reference point hasn't changed we can avoid the busy task
+	// of recalculating them
+	levels map[string][]*level
+}
+
+func (c *ammCache) addAMM(a entities.AMMPool) {
+	c.activeAMMs[a.AmmPartyID.String()] = a
+
+	low := a.ParametersBase
+	if a.ParametersLowerBound != nil {
+		low = *a.ParametersLowerBound
+	}
+
+	if c.lowestBound.IsZero() {
+		c.lowestBound = low
+	} else {
+		c.lowestBound = num.MinD(c.lowestBound, low)
+	}
+
+	high := a.ParametersBase
+	if a.ParametersUpperBound != nil {
+		high = *a.ParametersUpperBound
+	}
+	c.highestBound = num.MaxD(c.highestBound, high)
+}
+
+func (c *ammCache) removeAMM(ammParty string) {
+	delete(c.activeAMMs, ammParty)
+	delete(c.ammOrders, ammParty)
+
+	// now we need to recalculate the lowest/highest
+
+	c.lowestBound = num.DecimalZero()
+	c.highestBound = num.DecimalZero()
+	for _, a := range c.activeAMMs {
+		low := a.ParametersBase
+		if a.ParametersLowerBound != nil {
+			low = *a.ParametersLowerBound
+		}
+		if c.lowestBound.IsZero() {
+			c.lowestBound = low
+		} else {
+			c.lowestBound = num.MinD(c.lowestBound, low)
+		}
+
+		high := a.ParametersBase
+		if a.ParametersUpperBound != nil {
+			high = *a.ParametersUpperBound
+		}
+		c.lowestBound = num.MaxD(c.highestBound, high)
+	}
 }
 
 type MarketDepth struct {

datanode/service/market_depth_amm.go

@@ -108,7 +108,14 @@ func (m *MarketDepth) getActiveAMMs(ctx context.Context) map[string][]entities.A
 	return ammByMarket
 }
 
-func (m *MarketDepth) getCalculationBounds(reference num.Decimal, priceFactor num.Decimal) []*level {
+func (m *MarketDepth) getCalculationBounds(cache *ammCache, reference num.Decimal, priceFactor num.Decimal) []*level {
+	if levels, ok := cache.levels[reference.String()]; ok {
+		return levels
+	}
+
+	lowestBound := cache.lowestBound
+	highestBound := cache.highestBound
+
 	// first lets calculate the region we will expand accurately, this will be some percentage either side of the reference price
 	factor := num.DecimalFromFloat(m.cfg.AmmFullExpansionPercentage).Div(hundred)
 
@@ -138,6 +145,34 @@ func (m *MarketDepth) getCalculationBounds(reference num.Decimal, priceFactor nu
 	estLow := num.UintZero().Sub(accLow, num.Min(accLow, eRange))
 	estHigh := num.UintZero().Add(accHigh, eRange)
 
+	// cap steps to the lowest/highest boundaries of all AMMs
+	lowD, _ := num.UintFromDecimal(lowestBound)
+	if accLow.LTE(lowD) {
+		accLow = lowD.Clone()
+		estLow = lowD.Clone()
+	}
+
+	highD, _ := num.UintFromDecimal(highestBound)
+	if accHigh.GTE(highD) {
+		accHigh = highD.Clone()
+		estHigh = highD.Clone()
+	}
+
+	// need to find the first n such that
+	// accLow - (n * eStep) < lowD
+	// accLow
+	if estLow.LT(lowD) {
+		delta, _ := num.UintZero().Delta(accLow, lowD)
+		delta.Div(delta, eStep)
+		estLow = num.UintZero().Sub(accLow, delta.Mul(delta, eStep))
+	}
+
+	if estHigh.GT(highD) {
+		delta, _ := num.UintZero().Delta(accHigh, highD)
+		delta.Div(delta, eStep)
+		estHigh = num.UintZero().Add(accHigh, delta.Mul(delta, eStep))
+	}
+
 	levels := []*level{}
 
 	// we now have our four prices [estLow, accLow, accHigh, estHigh] where from
@@ -164,6 +199,10 @@ func (m *MarketDepth) getCalculationBounds(reference num.Decimal, priceFactor nu
 		price = num.UintZero().Add(price, eStep)
 	}
 
+	cache.levels = map[string][]*level{
+		reference.String(): levels,
+	}
+
 	return levels
 }
 
@@ -268,7 +307,6 @@ func (m *MarketDepth) expandByLevels(pool entities.AMMPool, levels []*level, pri
 				v1 = ammDefn.position
 			}
 		}
-
 		// calculate the volume
 		volume := v1.Sub(v2).Abs().IntPart()
 
@@ -303,15 +341,15 @@ func (m *MarketDepth) InitialiseAMMs(ctx context.Context) {
 
 		// add it to our active list, we want to do this even if we fail to get a reference
 		for _, a := range amms {
-			cache.activeAMMs[a.AmmPartyID.String()] = a
+			cache.addAMM(a)
 		}
 
 		reference, err := m.getReference(ctx, marketID)
 		if err != nil {
 			continue
 		}
 
-		levels := m.getCalculationBounds(reference, priceFactor)
+		levels := m.getCalculationBounds(cache, reference, priceFactor)
 
 		for _, amm := range amms {
 			orders, estimated, err := m.expandByLevels(amm, levels, priceFactor)
@@ -345,7 +383,12 @@ func (m *MarketDepth) ExpandAMM(ctx context.Context, pool entities.AMMPool, pric
 		return nil, nil, err
 	}
 
-	levels := m.getCalculationBounds(reference, priceFactor)
+	cache, err := m.getAMMCache(string(pool.MarketID))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	levels := m.getCalculationBounds(cache, reference, priceFactor)
 
 	return m.expandByLevels(pool, levels, priceFactor)
 }
@@ -391,11 +434,12 @@ func (m *MarketDepth) refreshAMM(pool entities.AMMPool, depth *entities.MarketDe
 	}
 
 	if pool.Status == entities.AMMStatusCancelled || pool.Status == entities.AMMStatusStopped {
-		delete(cache.activeAMMs, ammParty)
-		delete(cache.ammOrders, ammParty)
+		cache.removeAMM(ammParty)
 		return
 	}
 
+	cache.addAMM(pool)
+
 	// expand it again into new orders and push them into the market depth
 	orders, estimated, _ := m.ExpandAMM(context.Background(), pool, cache.priceFactor)
 	for i := range orders {
@@ -404,9 +448,7 @@ func (m *MarketDepth) refreshAMM(pool entities.AMMPool, depth *entities.MarketDe
 			cache.estimatedOrder[orders[i].ID] = struct{}{}
 		}
 	}
-
 	cache.ammOrders[ammParty] = orders
-	cache.activeAMMs[ammParty] = pool
 }
 
 // refreshAMM is used when an AMM has either traded or its definition has changed.
@@ -484,6 +526,7 @@ func (m *MarketDepth) getAMMCache(marketID string) (*ammCache, error) {
 		ammOrders:      map[string][]*types.Order{},
 		activeAMMs:     map[string]entities.AMMPool{},
 		estimatedOrder: map[string]struct{}{},
+		levels:         map[string][]*level{},
 	}
 	m.ammCache[marketID] = cache
 

datanode/service/market_depth_amm_test.go

@@ -277,6 +277,82 @@ func TestEstimatedStepOverAMMBound(t *testing.T) {
 	assert.Equal(t, 3, int(mds.service.GetVolumeAtPrice(marketID, types.SideSell, 2001)))
 }
 
+func TestExpansionMuchBiggerThanAMMs(t *testing.T) {
+	ctx := context.Background()
+
+	cfg := service.MarketDepthConfig{
+		AmmFullExpansionPercentage: 1,
+		AmmMaxEstimatedSteps:       10,
+		AmmEstimatedStepPercentage: 5,
+	}
+
+	mds := getServiceWithConfig(t, cfg)
+	defer mds.ctrl.Finish()
+
+	marketID := vgcrypto.RandomHash()
+
+	ensureLiveOrders(t, mds, marketID)
+	ensureDecimalPlaces(t, mds)
+	mds.pos.EXPECT().GetByMarketAndParty(gomock.Any(), gomock.Any(), gomock.Any()).Return(entities.Position{OpenVolume: 0}, nil)
+	mds.marketData.EXPECT().GetMarketDataByID(gomock.Any(), gomock.Any()).Times(1).Return(entities.MarketData{MidPrice: num.DecimalFromInt64(2000)}, nil)
+
+	// data node is starting from network history, initialise market-depth based on whats aleady there
+	ensureAMMs(t, mds, marketID)
+	mds.service.Initialise(ctx)
+
+	assert.Equal(t, 465, int(mds.service.GetTotalAMMVolume(marketID)))
+	assert.Equal(t, 345, int(mds.service.GetAMMVolume(marketID, true)))
+	assert.Equal(t, 120, int(mds.service.GetAMMVolume(marketID, false)))
+	assert.Equal(t, 485, int(mds.service.GetTotalVolume(marketID)))
+
+	assert.Equal(t, "1999", mds.service.GetBestBidPrice(marketID).String())
+	assert.Equal(t, "2001", mds.service.GetBestAskPrice(marketID).String())
+}
+
+func TestMidPriceMove(t *testing.T) {
+	ctx := context.Background()
+
+	mds := getService(t)
+	defer mds.ctrl.Finish()
+
+	marketID := vgcrypto.RandomHash()
+
+	ensureLiveOrders(t, mds, marketID)
+	ensureDecimalPlaces(t, mds)
+	mds.pos.EXPECT().GetByMarketAndParty(gomock.Any(), gomock.Any(), gomock.Any()).Return(entities.Position{OpenVolume: 0}, nil)
+	mds.marketData.EXPECT().GetMarketDataByID(gomock.Any(), gomock.Any()).Times(1).Return(entities.MarketData{MidPrice: num.DecimalFromInt64(2000)}, nil)
+
+	// data node is starting from network history, initialise market-depth based on whats aleady there
+	pool := ensureAMMs(t, mds, marketID)
+	mds.service.Initialise(ctx)
+
+	assert.Equal(t, 240, int(mds.service.GetTotalAMMVolume(marketID)))
+	assert.Equal(t, 120, int(mds.service.GetAMMVolume(marketID, true)))
+	assert.Equal(t, 120, int(mds.service.GetAMMVolume(marketID, false)))
+	assert.Equal(t, 260, int(mds.service.GetTotalVolume(marketID)))
+
+	assert.Equal(t, "1999", mds.service.GetBestBidPrice(marketID).String())
+	assert.Equal(t, "2001", mds.service.GetBestAskPrice(marketID).String())
+
+	// now say the mid-price moves a little, we want to check we recalculate the levels properly
+	mds.pos.EXPECT().GetByMarketAndParty(gomock.Any(), gomock.Any(), gomock.Any()).Return(entities.Position{OpenVolume: 500}, nil)
+	mds.marketData.EXPECT().GetMarketDataByID(gomock.Any(), gomock.Any()).Times(1).Return(entities.MarketData{MidPrice: num.DecimalFromInt64(1800)}, nil)
+	mds.service.AddOrder(
+		&types.Order{
+			ID:       vgcrypto.RandomHash(),
+			Party:    pool.AmmPartyID.String(),
+			MarketID: marketID,
+			Side:     types.SideBuy,
+			Status:   entities.OrderStatusFilled,
+		},
+		time.Date(2022, 3, 8, 16, 15, 39, 901022000, time.UTC),
+		37,
+	)
+
+	assert.Equal(t, "1828", mds.service.GetBestBidPrice(marketID).String())
+	assert.Equal(t, "3000", mds.service.GetBestAskPrice(marketID).String()) // this is an actual order volume not AMM volume
+}
+
 func ensureLiveOrders(t *testing.T, mds *MDS, marketID string) {
 	t.Helper()
 	mds.orders.EXPECT().GetLiveOrders(gomock.Any()).Return([]entities.Order{
@@ -285,7 +361,7 @@ func ensureLiveOrders(t *testing.T, mds *MDS, marketID string) {
 			MarketID:  entities.MarketID(marketID),
 			PartyID:   entities.PartyID(vgcrypto.RandomHash()),
 			Side:      types.SideBuy,
-			Price:     decimal.NewFromInt(1800),
+			Price:     decimal.NewFromInt(1000),
 			Size:      10,
 			Remaining: 10,
 			Type:      entities.OrderTypeLimit,
@@ -300,7 +376,7 @@ func ensureLiveOrders(t *testing.T, mds *MDS, marketID string) {
 			Side:      types.SideSell,
 			Type:      entities.OrderTypeLimit,
 			Status:    entities.OrderStatusActive,
-			Price:     decimal.NewFromInt(2200),
+			Price:     decimal.NewFromInt(3000),
 			Size:      10,
 			Remaining: 10,
 			VegaTime:  time.Date(2022, 3, 8, 14, 15, 39, 901022000, time.UTC),