move glassnode to datasource

pkg/datasource/glassnode/datasource.go

@@ -4,25 +4,25 @@ import (
 	"context"
 	"time"
 
-	"github.com/c9s/bbgo/pkg/glassnode/glassnodeapi"
+	"github.com/c9s/bbgo/pkg/datasource/glassnode/glassnodeapi"
 )
 
-type Glassnode struct {
+type DataSource struct {
 	client *glassnodeapi.RestClient
 }
 
-func New(apiKey string) *Glassnode {
+func New(apiKey string) *DataSource {
 	client := glassnodeapi.NewRestClient()
 	client.Auth(apiKey)
 
-	return &Glassnode{client: client}
+	return &DataSource{client: client}
 }
 
 // query last futures open interest
 // https://docs.glassnode.com/api/derivatives#futures-open-interest
-func (g *Glassnode) QueryFuturesOpenInterest(ctx context.Context, currency string) (float64, error) {
+func (d *DataSource) QueryFuturesOpenInterest(ctx context.Context, currency string) (float64, error) {
 	req := glassnodeapi.DerivativesRequest{
-		Client: g.client,
+		Client: d.client,
 		Asset:  currency,
 		// 25 hours ago
 		Since:    time.Now().Add(-25 * time.Hour).Unix(),
@@ -40,9 +40,9 @@ func (g *Glassnode) QueryFuturesOpenInterest(ctx context.Context, currency strin
 
 // query last market cap in usd
 // https://docs.glassnode.com/api/market#market-cap
-func (g *Glassnode) QueryMarketCapInUSD(ctx context.Context, currency string) (float64, error) {
+func (d *DataSource) QueryMarketCapInUSD(ctx context.Context, currency string) (float64, error) {
 	req := glassnodeapi.MarketRequest{
-		Client: g.client,
+		Client: d.client,
 		Asset:  currency,
 		// 25 hours ago
 		Since:    time.Now().Add(-25 * time.Hour).Unix(),