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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 aws
import (
"fmt"
"sync"
)
// 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)
}
// EC2Instance represents aws_ec2_instance type monitored resource.
// For definition refer to
// https://cloud.google.com/monitoring/api/resources#tag_aws_ec2_instance
type EC2Instance struct {
// AWSAccount is the AWS account number for the VM.
AWSAccount string
// InstanceID is the instance id of the instance.
InstanceID string
// Region is the AWS region for the VM. The format of this field is "aws:{region}",
// where supported values for {region} are listed at
// http://docs.aws.amazon.com/general/latest/gr/rande.html.
Region string
}
// MonitoredResource returns resource type and resource labels for AWSEC2Instance
func (aws *EC2Instance) MonitoredResource() (resType string, labels map[string]string) {
labels = map[string]string{
"aws_account": aws.AWSAccount,
"instance_id": aws.InstanceID,
"region": aws.Region,
}
return "aws_ec2_instance", labels
}
// Autodetect auto detects monitored resources based on
// the environment where the application is running.
// It supports detection of following resource types
// 1. 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() {
autoDetected = detectResourceType(retrieveAWSIdentityDocument())
})
return autoDetected
}()
}
// createAWSEC2InstanceMonitoredResource creates a aws_ec2_instance monitored resource
// awsIdentityDoc contains AWS EC2 specific attributes.
func createEC2InstanceMonitoredResource(awsIdentityDoc *awsIdentityDocument) *EC2Instance {
awsInstance := EC2Instance{
AWSAccount: awsIdentityDoc.accountID,
InstanceID: awsIdentityDoc.instanceID,
Region: fmt.Sprintf("aws:%s", awsIdentityDoc.region),
}
return &awsInstance
}
// detectOnce is used to make sure 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
// detectResourceType determines the resource type.
// awsIdentityDoc contains AWS EC2 attributes. nil if it is not AWS EC2 environment
func detectResourceType(awsIdentityDoc *awsIdentityDocument) Interface {
if awsIdentityDoc != nil {
return createEC2InstanceMonitoredResource(awsIdentityDoc)
}
return nil
}