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aws_identity_doc_utils.go
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aws_identity_doc_utils.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 (
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
)
// awsIdentityDocument is used to store parsed AWS Identity Document.
type awsIdentityDocument struct {
// accountID is the AWS account number for the VM.
accountID string
// instanceID is the instance id of the instance.
instanceID string
// Region is the AWS region for the VM.
region string
}
// retrieveAWSIdentityDocument attempts to retrieve AWS Identity Document.
// If the environment is AWS EC2 Instance then a valid document is retrieved.
// Relevant attributes from the document are stored in awsIdentityDoc.
// This is only done once.
func retrieveAWSIdentityDocument() *awsIdentityDocument {
awsIdentityDoc := awsIdentityDocument{}
sesion, err := session.NewSession()
if err != nil {
return nil
}
c := ec2metadata.New(sesion)
if !c.Available() {
return nil
}
ec2InstanceIdentifyDocument, err := c.GetInstanceIdentityDocument()
if err != nil {
return nil
}
awsIdentityDoc.region = ec2InstanceIdentifyDocument.Region
awsIdentityDoc.instanceID = ec2InstanceIdentifyDocument.InstanceID
awsIdentityDoc.accountID = ec2InstanceIdentifyDocument.AccountID
return &awsIdentityDoc
}