/
gcp_metadata_config.go
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/
gcp_metadata_config.go
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// Copyright 2018, OpenCensus 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 monitoredresource
import (
"log"
"os"
"strings"
"cloud.google.com/go/compute/metadata"
)
// gcpMetadata represents metadata retrieved from GCP (GKE and GCE) environment.
type gcpMetadata struct {
// projectID is the identifier of the GCP project associated with this resource, such as "my-project".
projectID string
// instanceID is the numeric VM instance identifier assigned by Compute Engine.
instanceID string
// clusterName is the name for the cluster the container is running in.
clusterName string
// containerName is the name of the container.
containerName string
// namespaceID is the identifier for the cluster namespace the container is running in
namespaceID string
// podID is the identifier for the pod the container is running in.
podID string
// zone is the Compute Engine zone in which the VM is running.
zone string
}
// retrieveGCPMetadata retrieves value of each Attribute from Metadata Server
// in GKE container and GCE instance environment.
// Some attributes are retrieved from the system environment.
// This is only executed detectOnce.
func retrieveGCPMetadata() *gcpMetadata {
gcpMetadata := gcpMetadata{}
var err error
gcpMetadata.instanceID, err = metadata.InstanceID()
if err != nil {
// Not a GCP environment
return &gcpMetadata
}
gcpMetadata.projectID, err = metadata.ProjectID()
logError(err)
gcpMetadata.zone, err = metadata.Zone()
logError(err)
clusterName, err := metadata.InstanceAttributeValue("cluster-name")
logError(err)
gcpMetadata.clusterName = strings.TrimSpace(clusterName)
// Following attributes are derived from environment variables. They are configured
// via yaml file. For details refer to:
// https://cloud.google.com/kubernetes-engine/docs/tutorials/custom-metrics-autoscaling#exporting_metrics_from_the_application
gcpMetadata.namespaceID = os.Getenv("NAMESPACE")
gcpMetadata.containerName = os.Getenv("CONTAINER_NAME")
gcpMetadata.podID = os.Getenv("HOSTNAME")
return &gcpMetadata
}
// logError logs error only if the error is present and it is not 'not defined'
func logError(err error) {
if err != nil {
if !strings.Contains(err.Error(), "not defined") {
log.Printf("Error retrieving gcp metadata: %v", err)
}
}
}