forked from flannel-io/flannel
/
metadata.go
76 lines (68 loc) · 1.83 KB
/
metadata.go
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// Copyright 2015 flannel 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.
// +build !windows
package gce
import (
"io/ioutil"
"net/http"
"path"
"strings"
)
func networkFromMetadata() (string, error) {
network, err := metadataGet("/instance/network-interfaces/0/network")
if err != nil {
return "", err
}
return path.Base(network), nil
}
func projectFromMetadata() (string, error) {
projectName, err := metadataGet("/project/project-id")
if err != nil {
return "", err
}
return path.Base(projectName), nil
}
func instanceZoneFromMetadata() (string, error) {
zone, err := metadataGet("/instance/zone")
if err != nil {
return "", err
}
return path.Base(zone), nil
}
func instanceNameFromMetadata() (string, error) {
hostname, err := metadataGet("/instance/hostname")
if err != nil {
return "", err
}
//works because we can't have . in the instance name
return strings.SplitN(hostname, ".", 2)[0], nil
}
func metadataGet(path string) (string, error) {
req, err := http.NewRequest("GET", metadataEndpoint+path, nil)
if err != nil {
return "", err
}
req.Header.Add("Metadata-Flavor", "Google")
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(data), nil
}