forked from kubernetes/autoscaler
/
metadata.go
492 lines (438 loc) · 10.9 KB
/
metadata.go
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/*
Copyright 2018 The Kubernetes 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.
*/
package metadata
import (
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"strings"
"time"
"encoding/json"
"reflect"
"os"
)
/* const vars */
const (
ENDPOINT = "http://100.100.100.200"
DNS_NAMESERVERS = "dns-conf/nameservers"
EIPV4 = "eipv4"
HOSTNAME = "hostname"
IMAGE_ID = "image-id"
INSTANCE_ID = "instance-id"
MAC = "mac"
NETWORK_TYPE = "network-type"
NTP_CONF_SERVERS = "ntp-conf/ntp-servers"
OWNER_ACCOUNT_ID = "owner-account-id"
PRIVATE_IPV4 = "private-ipv4"
REGION = "region-id"
SERIAL_NUMBER = "serial-number"
SOURCE_ADDRESS = "source-address"
VPC_CIDR_BLOCK = "vpc-cidr-block"
VPC_ID = "vpc-id"
VSWITCH_CIDR_BLOCK = "vswitch-cidr-block"
VSWITCH_ID = "vswitch-id"
ZONE = "zone-id"
RAM_SECURITY = "Ram/security-credentials"
)
// IMetaDataRequest interface
type IMetaDataRequest interface {
Version(version string) IMetaDataRequest
ResourceType(rtype string) IMetaDataRequest
Resource(resource string) IMetaDataRequest
SubResource(sub string) IMetaDataRequest
Url() (string, error)
Do(api interface{}) error
}
// MetaData wrap http client
type MetaData struct {
// mock for unit test.
mock requestMock
client *http.Client
}
// NewMetaData returns MetaData
func NewMetaData(client *http.Client) *MetaData {
if client == nil {
client = &http.Client{}
}
return &MetaData{
client: client,
}
}
// NewMockMetaData returns mock MetaData
func NewMockMetaData(client *http.Client, sendRequest requestMock) *MetaData {
if client == nil {
client = &http.Client{}
}
return &MetaData{
client: client,
mock: sendRequest,
}
}
// New returns MetaDataRequest
func (m *MetaData) New() *MetaDataRequest {
return &MetaDataRequest{
client: m.client,
sendRequest: m.mock,
}
}
// HostName returns host name
func (m *MetaData) HostName() (string, error) {
var hostname ResultList
err := m.New().Resource(HOSTNAME).Do(&hostname)
if err != nil {
return "", err
}
return hostname.result[0], nil
}
// ImageID returns image id
func (m *MetaData) ImageID() (string, error) {
var image ResultList
err := m.New().Resource(IMAGE_ID).Do(&image)
if err != nil {
return "", err
}
return image.result[0], err
}
// InstanceID returns instance Id
func (m *MetaData) InstanceID() (string, error) {
var instanceid ResultList
err := m.New().Resource(INSTANCE_ID).Do(&instanceid)
if err != nil {
return "", err
}
return instanceid.result[0], err
}
// Mac returns mac address
func (m *MetaData) Mac() (string, error) {
var mac ResultList
err := m.New().Resource(MAC).Do(&mac)
if err != nil {
return "", err
}
return mac.result[0], nil
}
// NetworkType returns network type
func (m *MetaData) NetworkType() (string, error) {
var network ResultList
err := m.New().Resource(NETWORK_TYPE).Do(&network)
if err != nil {
return "", err
}
return network.result[0], nil
}
// OwnerAccountID returns owner account id
func (m *MetaData) OwnerAccountID() (string, error) {
var owner ResultList
err := m.New().Resource(OWNER_ACCOUNT_ID).Do(&owner)
if err != nil {
return "", err
}
return owner.result[0], nil
}
// PrivateIPv4 returns private ipv4 ip address
func (m *MetaData) PrivateIPv4() (string, error) {
var private ResultList
err := m.New().Resource(PRIVATE_IPV4).Do(&private)
if err != nil {
return "", err
}
return private.result[0], nil
}
// Region returns region
func (m *MetaData) Region() (string, error) {
var region ResultList
err := m.New().Resource(REGION).Do(®ion)
if err != nil {
return "", err
}
return region.result[0], nil
}
// SerialNumber returns serial number
func (m *MetaData) SerialNumber() (string, error) {
var serial ResultList
err := m.New().Resource(SERIAL_NUMBER).Do(&serial)
if err != nil {
return "", err
}
return serial.result[0], nil
}
// SourceAddress returns source address
func (m *MetaData) SourceAddress() (string, error) {
var source ResultList
err := m.New().Resource(SOURCE_ADDRESS).Do(&source)
if err != nil {
return "", err
}
return source.result[0], nil
}
// VpcCIDRBlock returns vpc cidr block
func (m *MetaData) VpcCIDRBlock() (string, error) {
var vpcCIDR ResultList
err := m.New().Resource(VPC_CIDR_BLOCK).Do(&vpcCIDR)
if err != nil {
return "", err
}
return vpcCIDR.result[0], err
}
// VpcID returns vpc id
func (m *MetaData) VpcID() (string, error) {
var vpcId ResultList
err := m.New().Resource(VPC_ID).Do(&vpcId)
if err != nil {
return "", err
}
return vpcId.result[0], err
}
// VswitchCIDRBlock returns vswitch cidr block
func (m *MetaData) VswitchCIDRBlock() (string, error) {
var cidr ResultList
err := m.New().Resource(VSWITCH_CIDR_BLOCK).Do(&cidr)
if err != nil {
return "", err
}
return cidr.result[0], err
}
// VswitchID returns vswitch id
func (m *MetaData) VswitchID() (string, error) {
var vswithcid ResultList
err := m.New().Resource(VSWITCH_ID).Do(&vswithcid)
if err != nil {
return "", err
}
return vswithcid.result[0], err
}
// EIPv4 returns eip
func (m *MetaData) EIPv4() (string, error) {
var eip ResultList
err := m.New().Resource(EIPV4).Do(&eip)
if err != nil {
return "", err
}
return eip.result[0], nil
}
// DNSNameServers returns dns servers
func (m *MetaData) DNSNameServers() ([]string, error) {
var data ResultList
err := m.New().Resource(DNS_NAMESERVERS).Do(&data)
if err != nil {
return []string{}, err
}
return data.result, nil
}
// NTPConfigServers returns ntp servers
func (m *MetaData) NTPConfigServers() ([]string, error) {
var data ResultList
err := m.New().Resource(NTP_CONF_SERVERS).Do(&data)
if err != nil {
return []string{}, err
}
return data.result, nil
}
// Zone returns zone id
func (m *MetaData) Zone() (string, error) {
var zone ResultList
err := m.New().Resource(ZONE).Do(&zone)
if err != nil {
return "", err
}
return zone.result[0], nil
}
// RoleName returns role name
func (m *MetaData) RoleName() (string, error) {
var roleName ResultList
err := m.New().Resource("ram/security-credentials/").Do(&roleName)
if err != nil {
return "", err
}
return roleName.result[0], nil
}
// RamRoleToken returns ram role token
func (m *MetaData) RamRoleToken(role string) (RoleAuth, error) {
var roleauth RoleAuth
err := m.New().Resource(RAM_SECURITY).SubResource(role).Do(&roleauth)
if err != nil {
return RoleAuth{}, err
}
return roleauth, nil
}
type requestMock func(resource string) (string, error)
// MetaDataRequest struct
type MetaDataRequest struct {
version string
resourceType string
resource string
subResource string
client *http.Client
sendRequest requestMock
}
// Version sets version
func (vpc *MetaDataRequest) Version(version string) IMetaDataRequest {
vpc.version = version
return vpc
}
// ResourceType sets resource type
func (vpc *MetaDataRequest) ResourceType(rtype string) IMetaDataRequest {
vpc.resourceType = rtype
return vpc
}
// Resource sets resource
func (vpc *MetaDataRequest) Resource(resource string) IMetaDataRequest {
vpc.resource = resource
return vpc
}
// SubResource set sub resource
func (vpc *MetaDataRequest) SubResource(sub string) IMetaDataRequest {
vpc.subResource = sub
return vpc
}
var retry = AttemptStrategy{
Min: 5,
Total: 5 * time.Second,
Delay: 200 * time.Millisecond,
}
// Url returns url
func (vpc *MetaDataRequest) Url() (string, error) {
if vpc.version == "" {
vpc.version = "latest"
}
if vpc.resourceType == "" {
vpc.resourceType = "meta-data"
}
if vpc.resource == "" {
return "", errors.New("the resource you want to visit must not be nil!")
}
endpoint := os.Getenv("METADATA_ENDPOINT")
if endpoint == "" {
endpoint = ENDPOINT
}
r := fmt.Sprintf("%s/%s/%s/%s", endpoint, vpc.version, vpc.resourceType, vpc.resource)
if vpc.subResource == "" {
return r, nil
}
return fmt.Sprintf("%s/%s", r, vpc.subResource), nil
}
// Do try to do MetaDataRequest
func (vpc *MetaDataRequest) Do(api interface{}) (err error) {
var res = ""
for r := retry.Start(); r.Next(); {
if vpc.sendRequest != nil {
res, err = vpc.sendRequest(vpc.resource)
} else {
res, err = vpc.send()
}
if !shouldRetry(err) {
break
}
}
if err != nil {
return err
}
return vpc.Decode(res, api)
}
// Decode returns decoded content
func (vpc *MetaDataRequest) Decode(data string, api interface{}) error {
if data == "" {
url, _ := vpc.Url()
return fmt.Errorf("metadata: alivpc decode data must not be nil. url=[%s]\n", url)
}
switch api.(type) {
case *ResultList:
api.(*ResultList).result = strings.Split(data, "\n")
return nil
case *RoleAuth:
return json.Unmarshal([]byte(data), api)
default:
return fmt.Errorf("metadata: unknow type to decode, type=%s\n", reflect.TypeOf(api))
}
}
func (vpc *MetaDataRequest) send() (string, error) {
url, err := vpc.Url()
if err != nil {
return "", err
}
requ, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return "", err
}
resp, err := vpc.client.Do(requ)
if err != nil {
return "", err
}
if resp.StatusCode != 200 {
return "", fmt.Errorf("Aliyun Metadata API Error: Status Code: %d", resp.StatusCode)
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err
}
return string(data), nil
}
// TimeoutError interface
type TimeoutError interface {
error
Timeout() bool // Is the error a timeout?
}
func shouldRetry(err error) bool {
if err == nil {
return false
}
_, ok := err.(TimeoutError)
if ok {
return true
}
switch err {
case io.ErrUnexpectedEOF, io.EOF:
return true
}
switch e := err.(type) {
case *net.DNSError:
return true
case *net.OpError:
switch e.Op {
case "read", "write":
return true
}
case *url.Error:
// url.Error can be returned either by net/url if a URL cannot be
// parsed, or by net/http if the response is closed before the headers
// are received or parsed correctly. In that later case, e.Op is set to
// the HTTP method name with the first letter uppercased. We don't want
// to retry on POST operations, since those are not idempotent, all the
// other ones should be safe to retry.
switch e.Op {
case "Get", "Put", "Delete", "Head":
return shouldRetry(e.Err)
default:
return false
}
}
return false
}
// ResultList struct
type ResultList struct {
result []string
}
// RoleAuth struct
type RoleAuth struct {
AccessKeyId string
AccessKeySecret string
Expiration time.Time
SecurityToken string
LastUpdated time.Time
Code string
}