mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
/*
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*
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* Copyright 2021 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package googledirectpath
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"sync"
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"time"
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)
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func getFromMetadata(timeout time.Duration, urlStr string) ([]byte, error) {
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parsedURL, err := url.Parse(urlStr)
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if err != nil {
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return nil, err
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}
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client := &http.Client{Timeout: timeout}
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req := &http.Request{
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Method: http.MethodGet,
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URL: parsedURL,
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Header: http.Header{"Metadata-Flavor": {"Google"}},
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}
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resp, err := client.Do(req)
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if err != nil {
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return nil, fmt.Errorf("failed communicating with metadata server: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("metadata server returned resp with non-OK: %v", resp)
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed reading from metadata server: %v", err)
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}
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return body, nil
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}
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var (
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zone string
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zoneOnce sync.Once
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)
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// Defined as var to be overridden in tests.
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var getZone = func(timeout time.Duration) string {
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zoneOnce.Do(func() {
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qualifiedZone, err := getFromMetadata(timeout, zoneURL)
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if err != nil {
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logger.Warningf("could not discover instance zone: %v", err)
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return
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}
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i := bytes.LastIndexByte(qualifiedZone, '/')
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if i == -1 {
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logger.Warningf("could not parse zone from metadata server: %s", qualifiedZone)
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return
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}
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zone = string(qualifiedZone[i+1:])
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})
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return zone
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}
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var (
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ipv6Capable bool
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ipv6CapableOnce sync.Once
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)
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// Defined as var to be overridden in tests.
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var getIPv6Capable = func(timeout time.Duration) bool {
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ipv6CapableOnce.Do(func() {
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_, err := getFromMetadata(timeout, ipv6URL)
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if err != nil {
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logger.Warningf("could not discover ipv6 capability: %v", err)
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return
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}
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ipv6Capable = true
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})
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return ipv6Capable
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}
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