add LoadedCrossExchangeStrategies loader api

pkg/bbgo/environment.go

@@ -17,12 +17,17 @@ import (
 	"github.com/c9s/bbgo/pkg/types"
 )
 
-var LoadedStrategies = make(map[string]interface{})
+var LoadedExchangeStrategies = make(map[string]SingleExchangeStrategy)
 
-func RegisterStrategy(key string, configmap interface{}) {
-	LoadedStrategies[key] = configmap
+func RegisterExchangeStrategy(key string, configmap SingleExchangeStrategy) {
+	LoadedExchangeStrategies[key] = configmap
 }
 
+var LoadedCrossExchangeStrategies = make(map[string]CrossExchangeStrategy)
+
+func RegisterCrossExchangeStrategy(key string, configmap CrossExchangeStrategy) {
+	LoadedCrossExchangeStrategies[key] = configmap
+}
 
 // Environment presents the real exchange data layer
 type Environment struct {

pkg/loader/loader.go

@@ -11,18 +11,29 @@ import (
 	"github.com/c9s/bbgo/pkg/bbgo"
 )
 
-func LoadExchangeStrategies(configFile string) (strategies []bbgo.SingleExchangeStrategy, err error) {
+type Stash map[string]interface{}
+
+func Load(configFile string) (Stash, error) {
 	config, err := ioutil.ReadFile(configFile)
 	if err != nil {
 		return nil, err
 	}
 
-	conf := make(map[string]interface{})
-	if err := yaml.Unmarshal(config, conf); err != nil {
+	stash := make(Stash)
+	if err := yaml.Unmarshal(config, stash); err != nil {
 		return nil, err
 	}
 
-	exchangeStrategiesConf, ok := conf["exchangeStrategies"]
+	return stash, err
+}
+
+func LoadExchangeStrategies(configFile string) (strategies []bbgo.SingleExchangeStrategy, err error) {
+	stash, err := Load(configFile)
+	if err != nil {
+		return nil, err
+	}
+
+	exchangeStrategiesConf, ok := stash["exchangeStrategies"]
 	if !ok {
 		return nil, errors.New("exchangeStrategies is not defined")
 	}
@@ -39,7 +50,7 @@ func LoadExchangeStrategies(configFile string) (strategies []bbgo.SingleExchange
 		}
 
 		for id, conf := range sConf {
-			if st, ok := bbgo.LoadedStrategies[id]; ok {
+			if st, ok := bbgo.LoadedExchangeStrategies[id]; ok {
 				// get the type "*Strategy"
 				rt := reflect.TypeOf(st)
 				val := reflect.New(rt)

pkg/strategy/buyandhold/strategy.go

@@ -2,8 +2,6 @@ package buyandhold
 
 import (
 	"context"
-	"encoding/json"
-	"io/ioutil"
 	"math"
 
 	log "github.com/sirupsen/logrus"
@@ -14,7 +12,7 @@ import (
 )
 
 func init() {
-	bbgo.RegisterStrategy("buyandhold", &Strategy{})
+	bbgo.RegisterExchangeStrategy("buyandhold", &Strategy{})
 }
 
 type Strategy struct {
@@ -25,17 +23,6 @@ type Strategy struct {
 	MinDropPercentage float64 `json:"minDropPercentage"`
 }
 
-func LoadFile(filepath string) (*Strategy, error) {
-	o, err := ioutil.ReadFile(filepath)
-	if err != nil {
-		return nil, err
-	}
-
-	var strategy Strategy
-	err = json.Unmarshal(o, &strategy)
-	return &strategy, err
-}
-
 func New(symbol string, interval string, baseQuantity float64) *Strategy {
 	return &Strategy{
 		Symbol:            symbol,