update engine init

engine/engine.go

 package engine
 
 import (
+	"fmt"
 	"sync"
 
 	"github.com/exchain/process/database"
@@ -8,6 +9,7 @@ import (
 	"github.com/exchain/process/orderbook"
 	"github.com/exchain/process/types"
 
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/exchain/go-exchain/exchain"
 	"github.com/exchain/go-exchain/exchain/chaindb"
 	nebulav1 "github.com/exchain/go-exchain/exchain/protocol/gen/go/nebula/v1"
@@ -16,6 +18,7 @@ import (
 
 // Engine 实现订单撮合引擎
 type Engine struct {
+	log        log.Logger
 	db         *database.DexDB
 	orderbooks map[string]*orderbook.OrderBook
 	chainDB    chaindb.ChainDB
@@ -23,6 +26,8 @@ type Engine struct {
 	sync.Mutex
 }
 
+var _ exchain.Engine = (*Engine)(nil)
+
 var eg *Engine
 
 func GetEngine() *Engine {
@@ -33,12 +38,12 @@ func GetEngine() *Engine {
 }
 
 // NewEngine 创建一个新的订单撮合引擎
-func NewEngine(chainDB chaindb.ChainDB) *Engine {
+func NewEngine(dataroot string, log log.Logger, chainDB chaindb.ChainDB) *Engine {
 	if eg != nil {
 		return eg
 	}
 
-	lvdb, err := leveldb.New("data/dexdb", 1024, 1024, "dexdata", false)
+	lvdb, err := leveldb.New(fmt.Sprintf("%s/orderdata", dataroot), 1024, 1024, "orderdata", false)
 	if err != nil {
 		panic(err)
 	}
@@ -49,6 +54,7 @@ func NewEngine(chainDB chaindb.ChainDB) *Engine {
 	}
 
 	eg = &Engine{
+		log:        log,
 		db:         db,
 		orderbooks: make(map[string]*orderbook.OrderBook),
 		chainDB:    chainDB,