improve config loading by adding unmarshal yaml method

config/bbgo.yaml

@@ -27,12 +27,10 @@ reportPnL:
 sessions:
   max:
     exchange: max
-    keyVar: MAX_API_KEY
-    secretVar: MAX_API_SECRET
+    envVarPrefix: "MAX_API_"
   binance:
     exchange: binance
-    keyVar: BINANCE_API_KEY
-    secretVar: BINANCE_API_SECRET
+    envVarPrefix: "BINANCE_API_"
 
 exchangeStrategies:
 - on: binance

pkg/bbgo/strategy_test.go

@@ -53,16 +53,12 @@ func TestEnvironment_Connect(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	xdb, err := sqlx.Connect("mysql", mysqlURL)
-	assert.NoError(t, err)
-
 	environment := NewEnvironment()
 	environment.AddExchange("binance", exchange).
 		Subscribe(types.KLineChannel, "BTCUSDT", types.SubscribeOptions{})
 
-	err = environment.Connect(ctx)
+	err := environment.Connect(ctx)
 	assert.NoError(t, err)
 
 	time.Sleep(5 * time.Second)
 }
-

pkg/cmd/run.go

@@ -66,7 +66,7 @@ func compileRunFile(filepath string, config *config.Config) error {
 	return ioutil.WriteFile(filepath, buf.Bytes(), 0644)
 }
 
-func runConfig(ctx context.Context, config *config.Config) error {
+func runConfig(ctx context.Context, userConfig *config.Config) error {
 	// configure notifiers
 	slackToken := viper.GetString("slack-token")
 	if len(slackToken) > 0 {
@@ -93,21 +93,22 @@ func runConfig(ctx context.Context, config *config.Config) error {
 	trader := bbgo.NewTrader(environ)
 	trader.AddNotifier(notifierSet)
 
-	for _, entry := range config.ExchangeStrategies {
+	for _, entry := range userConfig.ExchangeStrategies {
 		for _, mount := range entry.Mounts {
 			log.Infof("attaching strategy %T on %s...", entry.Strategy, mount)
 			trader.AttachStrategyOn(mount, entry.Strategy)
 		}
 	}
 
-	for _, strategy := range config.CrossExchangeStrategies {
+	for _, strategy := range userConfig.CrossExchangeStrategies {
 		log.Infof("attaching strategy %T", strategy)
 		trader.AttachCrossExchangeStrategy(strategy)
 	}
 
-	for _, report := range config.PnLReporters {
+	for _, report := range userConfig.PnLReporters {
 		if len(report.AverageCostBySymbols) > 0 {
 
+			log.Infof("setting up average cost pnl reporter on symbols: %v", report.AverageCostBySymbols)
 			trader.ReportPnL(notifierSet).
 				AverageCostBySymbols(report.AverageCostBySymbols...).
 				Of(report.Of...).

pkg/config/loader.go

@@ -40,6 +40,23 @@ func (s *StringSlice) decode(a interface{}) error {
 	return nil
 }
 
+func (s *StringSlice) UnmarshalYAML(unmarshal func(interface{}) error) (err error) {
+	var ss []string
+	err = unmarshal(&ss)
+	if err == nil {
+		*s = ss
+		return
+	}
+
+	var as string
+	err = unmarshal(&as)
+	if err == nil {
+		*s = append(*s, as)
+	}
+
+	return err
+}
+
 func (s *StringSlice) UnmarshalJSON(b []byte) error {
 	var a interface{}
 	var err = json.Unmarshal(b, &a)
@@ -51,18 +68,25 @@ func (s *StringSlice) UnmarshalJSON(b []byte) error {
 }
 
 type PnLReporter struct {
-	AverageCostBySymbols StringSlice `json:"averageCostBySymbols"`
+	AverageCostBySymbols StringSlice `json:"averageCostBySymbols" yaml:"averageCostBySymbols"`
 	Of                   StringSlice `json:"of" yaml:"of"`
 	When                 StringSlice `json:"when" yaml:"when"`
 }
 
+type Session struct {
+	ExchangeName string `json:"exchange" yaml:"exchange"`
+	EnvVarPrefix string `json:"envVarPrefix" yaml:"envVarPrefix"`
+}
+
 type Config struct {
 	Imports []string `json:"imports" yaml:"imports"`
 
+	Sessions map[string]Session `json:"sessions,omitempty" yaml:"sessions,omitempty"`
+
 	ExchangeStrategies      []SingleExchangeStrategyConfig
 	CrossExchangeStrategies []bbgo.CrossExchangeStrategy
 
-	PnLReporters []PnLReporter `json:"reportPnL" yaml:"reportPnL"`
+	PnLReporters []PnLReporter `json:"reportPnL,omitempty" yaml:"reportPnL,omitempty"`
 }
 
 type Stash map[string]interface{}
@@ -84,12 +108,12 @@ func Load(configFile string) (*Config, error) {
 		return nil, err
 	}
 
-	stash, err := loadStash(content)
-	if err != nil {
+	if err := yaml.Unmarshal(content, &config); err != nil {
 		return nil, err
 	}
 
-	if err := loadImports(&config, stash); err != nil {
+	stash, err := loadStash(content)
+	if err != nil {
 		return nil, err
 	}
 
@@ -101,43 +125,9 @@ func Load(configFile string) (*Config, error) {
 		return nil, err
 	}
 
-	if err := loadReportPnL(&config, stash); err != nil {
-		return nil, err
-	}
-
 	return &config, nil
 }
 
-func loadImports(config *Config, stash Stash) error {
-	importStash, ok := stash["imports"]
-	if !ok {
-		return nil
-	}
-
-	imports, err := reUnmarshal(importStash, &config.Imports)
-	if err != nil {
-		return err
-	}
-
-	config.Imports = *imports.(*[]string)
-	return nil
-}
-
-func loadReportPnL(config *Config, stash Stash) error {
-	reporterStash, ok := stash["reportPnL"]
-	if !ok {
-		return nil
-	}
-
-	reporters, err := reUnmarshal(reporterStash, &config.PnLReporters)
-	if err != nil {
-		return err
-	}
-
-	config.PnLReporters = *(reporters.(*[]PnLReporter))
-	return nil
-}
-
 func loadCrossExchangeStrategies(config *Config, stash Stash) (err error) {
 	exchangeStrategiesConf, ok := stash["crossExchangeStrategies"]
 	if !ok {
@@ -148,7 +138,6 @@ func loadCrossExchangeStrategies(config *Config, stash Stash) (err error) {
 		return errors.New("no cross exchange strategy is registered")
 	}
 
-
 	configList, ok := exchangeStrategiesConf.([]interface{})
 	if !ok {
 		return errors.New("expecting list in crossExchangeStrategies")