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metadata.go
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/
metadata.go
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/**
* Copyright 2021 IBM Corp.
*
* 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 metadata ...
package metadata
import (
"context"
"fmt"
"strings"
"github.com/IBM/ibm-csi-common/pkg/utils"
"go.uber.org/zap"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
// NodeMetadata is a fakeable interface exposing necessary data
type NodeMetadata interface {
// GetZone ...
GetZone() string
// GetRegion ...
GetRegion() string
// GetWorkerID ...
GetWorkerID() string
}
type nodeMetadataManager struct {
zone string
region string
workerID string
}
// NodeInfo ...
//
//go:generate counterfeiter -o fake/fake_node_info.go --fake-name FakeNodeInfo . NodeInfo
type NodeInfo interface {
NewNodeMetadata(logger *zap.Logger) (NodeMetadata, error)
}
// NodeInfoManager ...
type NodeInfoManager struct {
NodeName string
}
var _ NodeMetadata = &nodeMetadataManager{}
// NewNodeMetadata ...
func (nodeManager *NodeInfoManager) NewNodeMetadata(logger *zap.Logger) (NodeMetadata, error) {
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
// creates the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
node, err := clientset.CoreV1().Nodes().Get(context.Background(), nodeManager.NodeName, metav1.GetOptions{})
if err != nil {
return nil, err
}
nodeLabels := node.ObjectMeta.Labels
if len(nodeLabels[utils.NodeRegionLabel]) == 0 || len(nodeLabels[utils.NodeZoneLabel]) == 0 {
errorMsg := fmt.Errorf("One or few required node label(s) is/are missing [%s, %s]. Node Labels Found = [#%v]", utils.NodeRegionLabel, utils.NodeZoneLabel, nodeLabels) //nolint:golint
return nil, errorMsg
}
var workerID string
// If the cluster is satellite, the machine-type label equals to UPI
if nodeLabels[utils.MachineTypeLabel] == utils.UPI {
// For a satellite cluster, workerID is fetched from vpc-instance-id node label, which is updated by the vpc-node-label-updater (init container)
workerID = nodeLabels[utils.NodeInstanceIDLabel]
} else {
// For managed and IPI cluster, workerID is fetched from the ProviderID in node spec.
workerID = fetchInstanceID(node.Spec.ProviderID)
if workerID == "" {
return nil, fmt.Errorf("Unable to fetch instance ID from node provider ID - %s", node.Spec.ProviderID)
}
}
return &nodeMetadataManager{
zone: nodeLabels[utils.NodeZoneLabel],
region: nodeLabels[utils.NodeRegionLabel],
workerID: workerID,
}, nil
}
func (manager *nodeMetadataManager) GetZone() string {
return manager.zone
}
func (manager *nodeMetadataManager) GetRegion() string {
return manager.region
}
func (manager *nodeMetadataManager) GetWorkerID() string {
return manager.workerID
}
// fetchInstanceID fetches instance ID from the provider ID in node spec.
func fetchInstanceID(providerID string) string {
s := strings.Split(providerID, "/")
if len(s) != 7 {
return ""
}
return s[6]
}