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aws.go
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aws.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 cloudinfo
import (
"os"
"strings"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/ec2metadata"
"github.com/aws/aws-sdk-go/aws/session"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/utils/cloudinfo"
)
const (
productVerFileName = "/sys/class/dmi/id/product_version"
biosVerFileName = "/sys/class/dmi/id/bios_vendor"
systemdOSReleaseFileName = "/etc/os-release"
amazon = "amazon"
)
func init() {
cloudinfo.RegisterCloudProvider(info.AWS, &provider{})
}
type provider struct{}
var _ cloudinfo.CloudProvider = provider{}
func (provider) IsActiveProvider() bool {
return fileContainsAmazonIdentifier(productVerFileName) ||
fileContainsAmazonIdentifier(biosVerFileName) ||
fileContainsAmazonIdentifier(systemdOSReleaseFileName)
}
func fileContainsAmazonIdentifier(filename string) bool {
fileContent, err := os.ReadFile(filename)
if err != nil {
return false
}
return strings.Contains(string(fileContent), amazon)
}
func getAwsMetadata(name string) string {
sess, err := session.NewSession(&aws.Config{})
if err != nil {
return info.UnknownInstance
}
client := ec2metadata.New(sess)
data, err := client.GetMetadata(name)
if err != nil {
return info.UnknownInstance
}
return data
}
func (provider) GetInstanceType() info.InstanceType {
return info.InstanceType(getAwsMetadata("instance-type"))
}
func (provider) GetInstanceID() info.InstanceID {
return info.InstanceID(getAwsMetadata("instance-id"))
}