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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package utilization
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
)
const (
awsHostname = "169.254.169.254"
awsEndpointPath = "/2016-09-02/dynamic/instance-identity/document"
awsEndpoint = "http://" + awsHostname + awsEndpointPath
)
type aws struct {
InstanceID string `json:"instanceId,omitempty"`
InstanceType string `json:"instanceType,omitempty"`
AvailabilityZone string `json:"availabilityZone,omitempty"`
}
func gatherAWS(util *Data, client *http.Client) error {
aws, err := getAWS(client)
if err != nil {
// Only return the error here if it is unexpected to prevent
// warning customers who aren't running AWS about a timeout.
if _, ok := err.(unexpectedAWSErr); ok {
return err
}
return nil
}
util.Vendors.AWS = aws
return nil
}
type unexpectedAWSErr struct{ e error }
func (e unexpectedAWSErr) Error() string {
return fmt.Sprintf("unexpected AWS error: %v", e.e)
}
func getAWS(client *http.Client) (*aws, error) {
response, err := client.Get(awsEndpoint)
if err != nil {
// No unexpectedAWSErr here: A timeout is usually going to
// happen.
return nil, err
}
defer response.Body.Close()
if response.StatusCode != 200 {
return nil, unexpectedAWSErr{e: fmt.Errorf("response code %d", response.StatusCode)}
}
data, err := ioutil.ReadAll(response.Body)
if err != nil {
return nil, unexpectedAWSErr{e: err}
}
a := &aws{}
if err := json.Unmarshal(data, a); err != nil {
return nil, unexpectedAWSErr{e: err}
}
if err := a.validate(); err != nil {
return nil, unexpectedAWSErr{e: err}
}
return a, nil
}
func (a *aws) validate() (err error) {
a.InstanceID, err = normalizeValue(a.InstanceID)
if err != nil {
return fmt.Errorf("invalid instance ID: %v", err)
}
a.InstanceType, err = normalizeValue(a.InstanceType)
if err != nil {
return fmt.Errorf("invalid instance type: %v", err)
}
a.AvailabilityZone, err = normalizeValue(a.AvailabilityZone)
if err != nil {
return fmt.Errorf("invalid availability zone: %v", err)
}
return
}
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