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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 (
"time"
"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"
)
func onAWS() bool {
// the default client behavior retried the operation multiple times with a 5s timeout per attempt.
// if you were not on aws, you would block for 20s when invoking this operation.
// we reduce retries to 0 and set the timeout to 2s to reduce the time this blocks when not on aws.
client := ec2metadata.New(session.New(&aws.Config{MaxRetries: aws.Int(0)}))
if client.Config.HTTPClient != nil {
client.Config.HTTPClient.Timeout = time.Duration(2 * time.Second)
}
return client.Available()
}
func getAwsMetadata(name string) string {
client := ec2metadata.New(session.New(&aws.Config{}))
data, err := client.GetMetadata(name)
if err != nil {
return info.UnknownInstance
}
return data
}
func getAwsInstanceType() info.InstanceType {
return info.InstanceType(getAwsMetadata("instance-type"))
}
func getAwsInstanceID() info.InstanceID {
return info.InstanceID(getAwsMetadata("instance-id"))
}