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monitored_resources.go
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/
monitored_resources.go
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// 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 (
"sync"
"contrib.go.opencensus.io/exporter/stackdriver/monitoredresource/aws"
"contrib.go.opencensus.io/exporter/stackdriver/monitoredresource/gcp"
)
// Interface is a type that represent monitor resource that satisfies monitoredresource.Interface
type Interface 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 Autodetect() Interface {
return func() Interface {
detectOnce.Do(func() {
var awsDetect, gcpDetect Interface
// 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 wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
awsDetect = aws.Autodetect()
}()
go func() {
defer wg.Done()
gcpDetect = gcp.Autodetect()
}()
wg.Wait()
autoDetected = awsDetect
if gcpDetect != nil {
autoDetected = gcpDetect
}
})
return autoDetected
}()
}
// detectOnce is used to make sure GCP and AWS metadata detect function executes only once.
var detectOnce sync.Once
// autoDetected is the metadata detected after the first execution of Autodetect function.
var autoDetected Interface