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attributes.go
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attributes.go
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// Copyright 2018 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 attributes posts data to Guest Attributes.
package attributes
import (
"bytes"
"compress/gzip"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
)
// PostAttribute posts data to Guest Attributes
func PostAttribute(url string, value io.Reader) error {
req, err := http.NewRequest("PUT", url, value)
if err != nil {
return err
}
req.Header.Add("Metadata-Flavor", "Google")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
b, err := ioutil.ReadAll(resp.Body)
responseErr := fmt.Sprintf(`received status code %q for request "%s %s"`, resp.Status, req.Method, req.URL.String())
if err == nil {
responseErr = fmt.Sprintf("%s\n Error response: %s", responseErr, string(b))
}
return fmt.Errorf("%s", responseErr)
}
return nil
}
// PostAttributeCompressed compresses and posts data to Guest Attributes
func PostAttributeCompressed(url string, body any) error {
buf := &bytes.Buffer{}
b := base64.NewEncoder(base64.StdEncoding, buf)
zw := gzip.NewWriter(b)
w := json.NewEncoder(zw)
if err := w.Encode(body); err != nil {
return err
}
if err := zw.Close(); err != nil {
return err
}
if err := b.Close(); err != nil {
return err
}
return PostAttribute(url, buf)
}