/
engine.go
144 lines (113 loc) · 3.87 KB
/
engine.go
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package engine
import (
"context"
"github.com/zeedexio/zeedex-bsc-sdk-backend/common"
"sync"
)
type Engine struct {
marketHandlerMap map[string]*MarketHandler
// Wait for all queue handler exit gracefully
Wg sync.WaitGroup
// global ctx, if this ctx is canceled, queue handlers should exit in a short time.
ctx context.Context
dbHandler *DBHandler
orderBookSnapshotHandler *OrderBookSnapshotHandler
orderBookActivitiesHandler *OrderBookActivitiesHandler
lock sync.Mutex
}
func NewEngine(ctx context.Context) *Engine {
engine := &Engine{
ctx: ctx,
marketHandlerMap: make(map[string]*MarketHandler),
Wg: sync.WaitGroup{},
}
return engine
}
func (e *Engine) RegisterDBHandler(handler DBHandler) {
e.dbHandler = &handler
}
func (e *Engine) RegisterOrderBookSnapshotHandler(handler OrderBookSnapshotHandler) {
e.orderBookSnapshotHandler = &handler
}
func (e *Engine) RegisterOrderBookActivitiesHandler(handler OrderBookActivitiesHandler) {
e.orderBookActivitiesHandler = &handler
}
type DBHandler interface {
Update(matchResult common.MatchResult) sync.WaitGroup
}
type OrderBookSnapshotHandler interface {
Update(key string, snapshot *common.SnapshotV2) sync.WaitGroup
}
type OrderBookActivitiesHandler interface {
Update(webSocketMessages []common.WebSocketMessage) sync.WaitGroup
}
func (e *Engine) HandleNewOrder(order *common.MemoryOrder) (matchResult common.MatchResult, hasMatch bool) {
e.lock.Lock()
defer e.lock.Unlock()
// find or create marketHandler if not exist yet
if _, exist := e.marketHandlerMap[order.MarketID]; !exist {
marketHandler, err := NewMarketHandler(e.ctx, order.MarketID)
if err != nil {
panic(err)
}
e.marketHandlerMap[order.MarketID] = marketHandler
}
// feed the handler with this new order
handler, _ := e.marketHandlerMap[order.MarketID]
matchResult, hasMatch = handler.handleNewOrder(order)
e.triggerDBHandlerIfNotNil(matchResult)
e.triggerOrderBookSnapshotHandlerIfNotNil(handler)
e.triggerOrderBookActivityHandlerIfNotNil(matchResult.OrderBookActivities)
return
}
func (e *Engine) ReInsertOrder(order *common.MemoryOrder) (msg *common.WebSocketMessage) {
e.lock.Lock()
defer e.lock.Unlock()
if _, exist := e.marketHandlerMap[order.MarketID]; !exist {
marketHandler, err := NewMarketHandler(e.ctx, order.MarketID)
if err != nil {
panic(err)
}
e.marketHandlerMap[order.MarketID] = marketHandler
}
handler, _ := e.marketHandlerMap[order.MarketID]
event := handler.orderbook.InsertOrder(order)
e.triggerOrderBookSnapshotHandlerIfNotNil(handler)
if event == nil {
return
} else {
msg := common.OrderBookChangeMessage(handler.market, handler.orderbook.Sequence, event.Side, event.Price, event.Amount)
return &msg
}
}
func (e *Engine) HandleCancelOrder(order *common.MemoryOrder) (msg *common.WebSocketMessage, success bool) {
e.lock.Lock()
defer e.lock.Unlock()
handler, _ := e.marketHandlerMap[order.MarketID]
event := handler.handleCancelOrder(order)
if event == nil {
return
} else {
e.triggerOrderBookSnapshotHandlerIfNotNil(handler)
msg := common.OrderBookChangeMessage(handler.market, handler.orderbook.Sequence, event.Side, event.Price, event.Amount)
return &msg, true
}
}
func (e *Engine) triggerDBHandlerIfNotNil(matchResult common.MatchResult) {
if e.dbHandler != nil {
(*e.dbHandler).Update(matchResult)
}
}
func (e *Engine) triggerOrderBookSnapshotHandlerIfNotNil(handler *MarketHandler) {
if e.orderBookSnapshotHandler != nil {
snapshot := handler.orderbook.SnapshotV2()
snapshot.Sequence = handler.orderbook.Sequence
snapshotKey := common.GetMarketOrderbookSnapshotV2Key(handler.market)
(*e.orderBookSnapshotHandler).Update(snapshotKey, snapshot)
}
}
func (e *Engine) triggerOrderBookActivityHandlerIfNotNil(msgs []common.WebSocketMessage) {
if e.orderBookActivitiesHandler != nil {
(*e.orderBookActivitiesHandler).Update(msgs)
}
}