feat: read,write data with buffered

internal/cmd/run.go

@@ -3,9 +3,7 @@ package cmd
 import (
 	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
-	"io"
 	"net/url"
 	"os"
 
@@ -88,31 +86,67 @@ func run(cmd *cobra.Command, args []string) error {
 func executeData(ctx context.Context, input, output interfaces.DumpIO) error {
 	var (
 		err   error
-		lines   []*interfaces.ESSource
-		succeed int
-		total   int
+		ch    = make(chan []*interfaces.ESSource, 1)
+		errCh = make(chan error)
 	)
 
+	// write goroutine
+	go func(c context.Context) {
+		var (
+			lines []*interfaces.ESSource
+		)
+
+		defer func() {
+			close(ch)
+		}()
+
 		for {
-
-		if lines, err = input.ReadData(ctx, f_limit); err != nil {
-			if errors.Is(err, io.EOF) {
-				return nil
-			}
-
-			return err
+			select {
+			case <-c.Done():
+				return
+			default:
+				if lines, err = input.ReadData(c, f_limit); err != nil {
+					errCh <- err
+					return
 				}
 
 				if len(lines) == 0 {
-			return nil
+					ch <- lines
+					return
 				}
 
-		if succeed, err = output.WriteData(ctx, lines); err != nil {
+				ch <- lines
+			}
+		}
+	}(ctx)
+
+	var (
+		succeed int
+		total   int
+		docs    []*interfaces.ESSource
+		ok      bool
+	)
+
+	for {
+		select {
+		case <-ctx.Done():
+		case err = <-errCh:
+			return err
+		case docs, ok = <-ch:
+			if !ok {
 				return err
 			}
 
-		if succeed != len(lines) {
-			return fmt.Errorf("cmd.run: got lines=%d, only succeed=%d", len(lines), succeed)
+			if len(docs) == 0 {
+				return nil
+			}
+
+			if succeed, err = output.WriteData(ctx, docs); err != nil {
+				return err
+			}
+
+			if succeed != len(docs) {
+				return fmt.Errorf("cmd.run: got lines=%d, only succeed=%d", len(docs), succeed)
 			}
 
 			total += succeed
@@ -120,6 +154,7 @@ func executeData(ctx context.Context, input, output interfaces.DumpIO) error {
 			logrus.Infof("Dump: succeed=%d total=%d docs succeed!!!", succeed, total)
 		}
 	}
+}
 
 func newIO(source string, ioType interfaces.IO) (interfaces.DumpIO, error) {
 	var (