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metadata.go
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metadata.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2021 Authors of Cilium
package metadata
import (
"context"
"fmt"
"io/ioutil"
"net/http"
"time"
)
const (
metadataURL = "http://100.100.100.200/latest/meta-data"
)
// GetInstanceID returns the instance ID from metadata
func GetInstanceID(ctx context.Context) (string, error) {
return getMetadata(ctx, "instance-id")
}
// GetInstanceType returns the instance type from metadata
func GetInstanceType(ctx context.Context) (string, error) {
return getMetadata(ctx, "instance/instance-type")
}
// GetRegionID returns the region ID from metadata
func GetRegionID(ctx context.Context) (string, error) {
return getMetadata(ctx, "region-id")
}
// GetZoneID returns the zone ID from metadata
func GetZoneID(ctx context.Context) (string, error) {
return getMetadata(ctx, "zone-id")
}
// GetVPCID returns the vpc ID that belongs to the ECS instance from metadata
func GetVPCID(ctx context.Context) (string, error) {
return getMetadata(ctx, "vpc-id")
}
// GetCIDRBlock returns the IPv4 CIDR that belongs to the ECS instance from metadata
func GetCIDRBlock(ctx context.Context) (string, error) {
return getMetadata(ctx, "vswitch-cidr-block")
}
// getMetadata gets metadata
// see https://www.alibabacloud.com/help/doc-detail/49122.htm
func getMetadata(ctx context.Context, path string) (string, error) {
client := &http.Client{
Timeout: time.Second * 10,
}
url := fmt.Sprintf("%s/%s", metadataURL, path)
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return "", err
}
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
respBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(respBytes), nil
}