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"
 
@@ -87,37 +85,84 @@ 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
+		err   error
+		ch    = make(chan []*interfaces.ESSource, 1)
+		errCh = make(chan error)
 	)
 
-	for {
+	// write goroutine
+	go func(c context.Context) {
+		var (
+			lines []*interfaces.ESSource
+		)
 
-		if lines, err = input.ReadData(ctx, f_limit); err != nil {
-			if errors.Is(err, io.EOF) {
-				return nil
+		defer func() {
+			close(ch)
+		}()
+
+		for {
+			select {
+			case <-c.Done():
+				return
+			default:
+				if lines, err = input.ReadData(c, f_limit); err != nil {
+					errCh <- err
+					return
+				}
+
+				if len(lines) == 0 {
+					ch <- lines
+					return
+				}
+
+				ch <- lines
 			}
-
-			return err
 		}
+	}(ctx)
 
-		if len(lines) == 0 {
-			return nil
+	// read goroutine
+	go func(c context.Context) {
+		var (
+			succeed int
+			total   int
+		)
+
+		for {
+			select {
+			case <-c.Done():
+				return
+			case docs, ok := <-ch:
+				if !ok {
+					return
+				}
+
+				if len(docs) == 0 {
+					errCh <- nil
+					return
+				}
+
+				if succeed, err = output.WriteData(c, docs); err != nil {
+					errCh <- err
+					return
+				}
+
+				if succeed != len(docs) {
+					errCh <- fmt.Errorf("cmd.run: got lines=%d, only succeed=%d", len(docs), succeed)
+					return
+				}
+
+				total += succeed
+
+				logrus.Infof("Dump: succeed=%d total=%d docs succeed!!!", succeed, total)
+			}
 		}
+	}(ctx)
 
-		if succeed, err = output.WriteData(ctx, lines); err != nil {
-			return err
-		}
-
-		if succeed != len(lines) {
-			return fmt.Errorf("cmd.run: got lines=%d, only succeed=%d", len(lines), succeed)
-		}
-
-		total += succeed
-
-		logrus.Infof("Dump: succeed=%d total=%d docs succeed!!!", succeed, total)
+	select {
+	case err = <-errCh:
+		return err
+	case <-ctx.Done():
+		return context.Canceled
 	}
 }