Copyright 2020, 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 aws

import (
	
	
)
awsIdentityDocument is used to store parsed AWS Identity Document.
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 () *awsIdentityDocument {
	 := awsIdentityDocument{}
	,  := session.NewSession()
	if  != nil {
		return nil
	}
	 := ec2metadata.New()
	if !.Available() {
		return nil
	}
	,  := .GetInstanceIdentityDocument()
	if  != nil {
		return nil
	}
	.region = .Region
	.instanceID = .InstanceID
	.accountID = .AccountID

	return &