use the existing utilerrors.AggregateGoroutines func to collect each cluster's replicas concurrently

Signed-off-by: carlory <baofa.fan@daocloud.io>

pkg/estimator/client/accurate.go

@@ -3,10 +3,10 @@ package client
 import (
 	"context"
 	"fmt"
-	"sync"
 	"time"
 
 	"google.golang.org/grpc/metadata"
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 
 	clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
 	workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
@@ -127,22 +127,18 @@ func getClusterReplicasConcurrently(parentCtx context.Context, clusters []string
 	ctx, cancel := context.WithTimeout(parentCtx, timeout)
 	defer cancel()
 
-	availableTargetClusters := make([]workv1alpha2.TargetCluster, len(clusters))
-
-	var wg sync.WaitGroup
-	errChan := make(chan error, len(clusters))
-	for i := range clusters {
-		wg.Add(1)
-		go func(idx int, cluster string) {
-			defer wg.Done()
-			replicas, err := getClusterReplicas(ctx, cluster)
+	clusterReplicas := make([]workv1alpha2.TargetCluster, len(clusters))
+	funcs := make([]func() error, len(clusters))
+	for index, cluster := range clusters {
+		localIndex, localCluster := index, cluster
+		funcs[index] = func() error {
+			replicas, err := getClusterReplicas(ctx, localCluster)
 			if err != nil {
-				errChan <- err
+				return err
 			}
-			availableTargetClusters[idx] = workv1alpha2.TargetCluster{Name: cluster, Replicas: replicas}
-		}(i, clusters[i])
+			clusterReplicas[localIndex] = workv1alpha2.TargetCluster{Name: localCluster, Replicas: replicas}
+			return nil
+		}
 	}
-	wg.Wait()
-
-	return availableTargetClusters, util.AggregateErrors(errChan)
+	return clusterReplicas, utilerrors.AggregateGoroutines(funcs...)
 }

pkg/util/error.go

@@ -1,22 +0,0 @@
-package util
-
-import utilerrors "k8s.io/apimachinery/pkg/util/errors"
-
-// AggregateErrors will receive all errors from the channel and stuff all non-nil errors
-// into the returned Aggregate.
-func AggregateErrors(ch <-chan error) error {
-	var errs []error
-	for {
-		drained := false
-		select {
-		case err := <-ch:
-			errs = append(errs, err)
-		default:
-			drained = true
-		}
-		if drained {
-			break
-		}
-	}
-	return utilerrors.NewAggregate(errs)
-}

pkg/util/error_test.go

@@ -1,45 +0,0 @@
-package util
-
-import (
-	"fmt"
-	"reflect"
-	"testing"
-
-	utilerrors "k8s.io/apimachinery/pkg/util/errors"
-)
-
-func TestAggregateErrors(t *testing.T) {
-	err1 := fmt.Errorf("error1")
-	err2 := fmt.Errorf("error2")
-	channel := make(chan error, 2)
-	channel <- err1
-	channel <- err2
-
-	tests := []struct {
-		name     string
-		input    <-chan error
-		expected error
-	}{
-		{
-			name:     "nil channel",
-			input:    nil,
-			expected: nil,
-		},
-		{
-			name:     "channel has no error",
-			input:    make(chan error, 1),
-			expected: nil,
-		},
-		{
-			name:     "channel has 2 errors",
-			input:    channel,
-			expected: utilerrors.NewAggregate([]error{err1, err2}),
-		},
-	}
-
-	for _, test := range tests {
-		if got := AggregateErrors(test.input); !reflect.DeepEqual(got, test.expected) {
-			t.Errorf("Test %s failed: expected %v, but got %v", test.name, test.expected, got)
-		}
-	}
-}