implement config yaml dummper

pkg/bbgo/config.go

@@ -1,6 +1,7 @@
 package bbgo
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
@@ -207,11 +208,51 @@ func (c *Config) Map() (map[string]interface{}, error) {
 			strategyID: params,
 		})
 	}
-	data["exchangeStrategies"] = exchangeStrategies
+
+	if len(exchangeStrategies) > 0 {
+		data["exchangeStrategies"] = exchangeStrategies
+	}
+
+	var crossExchangeStrategies []map[string]interface{}
+	for _, st := range c.CrossExchangeStrategies {
+		strategyID := st.ID()
+
+		var params Stash
+
+		out, err := json.Marshal(st)
+		if err != nil {
+			return nil, err
+		}
+
+		if err := json.Unmarshal(out, &params); err != nil {
+			return nil, err
+		}
+
+		crossExchangeStrategies = append(crossExchangeStrategies, map[string]interface{}{
+			strategyID: params,
+		})
+	}
+
+	if len(crossExchangeStrategies) > 0 {
+		data["crossExchangeStrategies"] = crossExchangeStrategies
+	}
 
 	return data, err
 }
 
+func (c *Config) YAML() ([]byte, error) {
+	m, err := c.Map()
+	if err != nil {
+		return nil, err
+	}
+
+	var buf bytes.Buffer
+	var enc = yaml.NewEncoder(&buf)
+	enc.SetIndent(2)
+	err = enc.Encode(m)
+	return buf.Bytes(), err
+}
+
 type Stash map[string]interface{}
 
 func loadStash(config []byte) (Stash, error) {
@@ -367,10 +408,26 @@ func loadExchangeStrategies(config *Config, stash Stash) (err error) {
 
 		var mounts []string
 		if val, ok := configStash["on"]; ok {
-			if values, ok := val.([]string); ok {
-				mounts = append(mounts, values...)
-			} else if str, ok := val.(string); ok {
-				mounts = append(mounts, str)
+			switch tv := val.(type) {
+
+			case []string:
+				mounts = append(mounts, tv...)
+
+			case string:
+				mounts = append(mounts, tv)
+
+			case []interface{}:
+				for _, f := range tv {
+					s, ok := f.(string)
+					if !ok {
+						return fmt.Errorf("%+v (%T) is not a string", f, f)
+					}
+
+					mounts = append(mounts, s)
+				}
+
+			default:
+				return fmt.Errorf("unexpected mount type: %T value: %+v", val, val)
 			}
 		}
 

pkg/bbgo/config_test.go

@@ -2,9 +2,11 @@ package bbgo
 
 import (
 	"context"
+	"io/ioutil"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"gopkg.in/yaml.v3"
 )
 
 func init() {
@@ -62,16 +64,16 @@ func TestLoadConfig(t *testing.T) {
 			wantErr: false,
 			f: func(t *testing.T, config *Config) {
 				assert.Len(t, config.ExchangeStrategies, 1)
-				assert.Equal(t, config.ExchangeStrategies, []ExchangeStrategyMount{{
+				assert.Equal(t, []ExchangeStrategyMount{{
 					Mounts: []string{"binance"},
 					Strategy: &TestStrategy{
 						Symbol:            "BTCUSDT",
 						Interval:          "1m",
 						BaseQuantity:      0.1,
-						MaxAssetQuantity:  0,
+						MaxAssetQuantity:  1.1,
 						MinDropPercentage: -0.05,
 					},
-				}})
+				}}, config.ExchangeStrategies)
 
 				m, err := config.Map()
 				assert.NoError(t, err)
@@ -108,12 +110,30 @@ func TestLoadConfig(t *testing.T) {
 								"symbol":            "BTCUSDT",
 								"baseQuantity":      0.1,
 								"interval":          "1m",
-								"maxAssetQuantity":  0.0,
+								"maxAssetQuantity":  1.1,
 								"minDropPercentage": -0.05,
 							},
 						},
 					},
 				}, m)
+
+				yamlText, err := config.YAML()
+				assert.NoError(t, err)
+
+				yamlTextSource, err := ioutil.ReadFile("testdata/strategy.yaml")
+				assert.NoError(t, err)
+
+				var sourceMap map[string]interface{}
+				err = yaml.Unmarshal(yamlTextSource, &sourceMap)
+				assert.NoError(t, err)
+				delete(sourceMap, "build")
+
+				var actualMap map[string]interface{}
+				err = yaml.Unmarshal(yamlText, &actualMap)
+				assert.NoError(t, err)
+				delete(actualMap, "build")
+
+				assert.Equal(t, sourceMap, actualMap)
 			},
 		},
 

pkg/bbgo/testdata/strategy.yaml

@@ -3,16 +3,15 @@ sessions:
   max:
     exchange: max
     envVarPrefix: MAX_
-
   binance:
     exchange: binance
     envVarPrefix: BINANCE_
 
 exchangeStrategies:
-- on: binance
+- on: ["binance"]
   test:
     symbol: "BTCUSDT"
     interval: "1m"
     baseQuantity: 0.1
     minDropPercentage: -0.05
-
+    maxAssetQuantity: 1.1