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utils.go
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utils.go
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// Copyright 2022 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package exporter
import (
"fmt"
"time"
"github.com/google/uuid"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"antrea.io/antrea/pkg/clusteridentity"
)
// getClusterUUID retrieves the cluster UUID (if available, with a timeout of 10s).
// Otherwise, it returns an empty cluster UUID and error. The cluster UUID should
// be available if Antrea is deployed to the cluster ahead of the flow aggregator,
// which is the expectation since when deploying flow aggregator as a Pod,
// networking needs to be configured by the CNI plugin.
func getClusterUUID(k8sClient kubernetes.Interface) (uuid.UUID, error) {
const retryInterval = time.Second
const timeout = 10 * time.Second
const defaultAntreaNamespace = "kube-system"
clusterIdentityProvider := clusteridentity.NewClusterIdentityProvider(
defaultAntreaNamespace,
clusteridentity.DefaultClusterIdentityConfigMapName,
k8sClient,
)
var clusterUUID uuid.UUID
if err := wait.PollImmediate(retryInterval, timeout, func() (bool, error) {
clusterIdentity, _, err := clusterIdentityProvider.Get()
if err != nil {
return false, nil
}
clusterUUID = clusterIdentity.UUID
return true, nil
}); err != nil {
return clusterUUID, fmt.Errorf("unable to retrieve cluster UUID from ConfigMap '%s/%s': timeout after %v", defaultAntreaNamespace, clusteridentity.DefaultClusterIdentityConfigMapName, timeout)
}
return clusterUUID, nil
}