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inflect.go
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/
inflect.go
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package inflect
import (
"encoding/json"
"errors"
"io/ioutil"
"net/http"
"strings"
)
// GetInstanceID reads the instance ID from the metadata URL.
func GetInstanceID() (string, error) {
res, err := http.Get("http://169.254.169.254/latest/meta-data/instance-id")
if err != nil {
return "", err
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(body), nil
}
// GetRegionFromInstance attempts to read the instance identity document to
// parse out what region an EC2 instance is in.
func GetRegionFromInstance() (string, error) {
res, err := http.Get("http://169.254.169.254/latest/dynamic/instance-identity/document")
if err != nil {
return "", err
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
var document map[string]string
err = json.Unmarshal(body, &document)
if err != nil {
return "", err
}
return document["region"], nil
}
// GetRegionFromARN parses the given ARN string, returning the AWS region.
func GetRegionFromARN(arn string) (string, error) {
parts := strings.Split(arn, ":")
if len(parts) != 6 {
return "", errors.New("Could not inflect AWS region: ARN does not look valid")
}
return string(parts[3]), nil
}