some fixes on goroutines

internal/services/backblaze.go

@@ -13,7 +13,6 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 
 	rcloneb2 "github.com/rclone/rclone/backend/b2"
 
@@ -23,16 +22,10 @@ import (
 	"golang.org/x/sync/semaphore"
 )
 
-const writers = 20
-const maxConcurrentWeight = 10
+const writers = 4
+const maxConcurrentWeight = 5
 const largeFileSize = 500 * 1024 * 1024 // 500 MB
 
-type UploadMessage struct {
-	key     string
-	startAt time.Time
-	endAt   time.Time
-}
-
 type BackBalze struct {
 	bucketName string
 	dir        string
@@ -47,7 +40,7 @@ func NewBackBlaze(bbID, bbKey string) *BackBalze {
 	return &BackBalze{
 		bbID:       bbID,
 		bbKey:      bbKey,
-		maxWorkers: runtime.NumCPU() * 3,
+		maxWorkers: runtime.NumCPU(),
 	}
 }
 func (b *BackBalze) WithBucket(bucketName string) *BackBalze {
@@ -63,7 +56,6 @@ func (b *BackBalze) WithFile(filePath string) *BackBalze {
 	return b
 }
 func (b *BackBalze) Sync(ctx context.Context) error {
-	msgsChan := make(chan UploadMessage)
 	if b.bucketName == "" && (b.filePath == "" || b.dir == "") {
 		return fmt.Errorf("bucket name is %v | filePath is %v | dir is %v", b.bucketName, b.filePath, b.dir)
 	}
@@ -109,12 +101,6 @@ func (b *BackBalze) Sync(ctx context.Context) error {
 
 		var wg sync.WaitGroup
 
-		go func() {
-			for m := range msgsChan {
-				log.Printf("\n\t%s:\n\tstart %s \n\tend %s\n", m.key, m.startAt.Format(time.RFC3339Nano), m.endAt.Format(time.RFC3339Nano))
-			}
-		}()
-
 		for i := 0; i < b.maxWorkers; i++ {
 			wg.Add(1)
 			go func() {
@@ -146,7 +132,6 @@ func (b *BackBalze) Sync(ctx context.Context) error {
 		// Close the channel (no more files to send)
 		close(fileChan)
 		wg.Wait()
-		close(msgsChan)
 
 		// Cleanup old files after backup is completed
 		if err := cleanBucket(ctx, bc, oldFiles); err != nil {
@@ -273,7 +258,6 @@ func copyFile(ctx context.Context, bucket *b2.Bucket, src string) error {
 	}
 	w := bucket.Object(fi.Name()).NewWriter(ctx)
 	w.ConcurrentUploads = writers
-	// w.ChunkSize = 1e9 / 2
 	w.UseFileBuffer = true
 	log.Println("start copying", fi.Name())
 	if _, err := io.Copy(w, f); err != nil {