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 monitoredresource

import (
	

	
	
)
Interface is a type that represent monitor resource that satisfies monitoredresource.Interface
MonitoredResource returns the resource type and resource labels.
	MonitoredResource() (resType string, labels map[string]string)
}
Autodetect auto detects monitored resources based on the environment where the application is running. It supports detection of following resource types 1. gke_container: 2. gce_instance: 3. aws_ec2_instance: Returns MonitoredResInterface which implements getLabels() and getType() For resource definition go to https://cloud.google.com/monitoring/api/resources
func () Interface {
	return func() Interface {
		detectOnce.Do(func() {
First attempts to retrieve AWS Identity Doc and GCP metadata. It then determines the resource type In GCP and AWS environment both func finishes quickly. However, in an environment other than those (e.g local laptop) it takes 2 seconds for GCP and 5-6 for AWS.
			var  sync.WaitGroup
			.Add(2)

			go func() {
				defer .Done()
				 = aws.Autodetect()
			}()
			go func() {
				defer .Done()
				 = gcp.Autodetect()
			}()

			.Wait()
			autoDetected = 
			if  != nil {
				autoDetected = 
			}
		})
		return autoDetected
	}()
}
detectOnce is used to make sure GCP and AWS metadata detect function executes only once.
autoDetected is the metadata detected after the first execution of Autodetect function.