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instance_metadata_sdk.go
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instance_metadata_sdk.go
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package instance
import (
"bytes"
"encoding/json"
"io/ioutil"
"math/rand"
"net"
"net/http"
"strconv"
"time"
"github.com/scaleway/scaleway-sdk-go/internal/errors"
)
var (
metadataURL = "http://169.254.42.42"
metadataRetryBindPort = 200
)
// MetadataAPI metadata API
type MetadataAPI struct {
}
// NewMetadataAPI returns a MetadataAPI object from a Scaleway client.
func NewMetadataAPI() *MetadataAPI {
return &MetadataAPI{}
}
// GetMetadata returns the metadata available from the server
func (*MetadataAPI) GetMetadata() (m *Metadata, err error) {
resp, err := http.Get(metadataURL + "/conf?format=json")
if err != nil {
return nil, errors.Wrap(err, "error getting metadataURL")
}
defer resp.Body.Close()
metadata := &Metadata{}
err = json.NewDecoder(resp.Body).Decode(metadata)
if err != nil {
return nil, errors.Wrap(err, "error decoding metadata")
}
return metadata, nil
}
// Metadata represents the struct return by the metadata API
type Metadata struct {
ID string `json:"id,omitempty"`
Name string `json:"name,omitempty"`
Hostname string `json:"hostname,omitempty"`
Organization string `json:"organization,omitempty"`
CommercialType string `json:"commercial_type,omitempty"`
PublicIP struct {
Dynamic bool `json:"dynamic,omitempty"`
ID string `json:"id,omitempty"`
Address string `json:"address,omitempty"`
} `json:"public_ip,omitempty"`
PrivateIP string `json:"private_ip,omitempty"`
IPv6 struct {
Netmask string `json:"netmask,omitempty"`
Gateway string `json:"gateway,omitempty"`
Address string `json:"address,omitempty"`
} `json:"ipv6,omitempty"`
Location struct {
PlatformID string `json:"platform_id,omitempty"`
HypervisorID string `json:"hypervisor_id,omitempty"`
NodeID string `json:"node_id,omitempty"`
ClusterID string `json:"cluster_id,omitempty"`
ZoneID string `json:"zone_id,omitempty"`
} `json:"location,omitempty"`
Tags []string `json:"tags,omitempty"`
StateDetail string `json:"state_detail,omitempty"`
SSHPublicKeys []struct {
Description string `json:"description,omitempty"`
ModificationDate string `json:"modification_date,omitempty"`
IP string `json:"ip,omitempty"`
Email string `json:"email,omitempty"`
UserAgent struct {
Platform string `json:"platform,omitempty"`
Version string `json:"version,omitempty"`
String string `json:"string,omitempty"`
Browser string `json:"browser,omitempty"`
} `json:"user_agent,omitempty"`
Key string `json:"key,omitempty"`
Fingerprint string `json:"fingerprint,omitempty"`
ID string `json:"id,omitempty"`
CreationDate string `json:"creation_date,omitempty"`
Port int `json:"port,omitempty"`
} `json:"ssh_public_keys,omitempty"`
Timezone string `json:"timezone,omitempty"`
Bootscript struct {
Kernel string `json:"kernel,omitempty"`
Title string `json:"title,omitempty"`
Default bool `json:"default,omitempty"`
Dtb string `json:"dtb,omitempty"`
Public bool `json:"publc,omitempty"`
Initrd string `json:"initrd,omitempty"`
Bootcmdargs string `json:"bootcmdargs,omitempty"`
Architecture string `json:"architecture,omitempty"`
Organization string `json:"organization,omitempty"`
ID string `json:"id,omitempty"`
} `json:"bootscript,omitempty"`
Volumes map[string]struct {
Name string `json:"name,omitempty"`
ModificationDate string `json:"modification_date,omitempty"`
ExportURI string `json:"export_uri,omitempty"`
VolumeType string `json:"volume_type,omitempty"`
CreationDate string `json:"creation_date,omitempty"`
State string `json:"state,omitempty"`
Organization string `json:"organization,omitempty"`
Server struct {
ID string `json:"id,omitempty"`
Name string `json:"name,omitempty"`
} `json:"server,omitempty"`
ID string `json:"id,omitempty"`
Size int `json:"size,omitempty"`
}
}
// ListUserData returns the metadata available from the server
func (*MetadataAPI) ListUserData() (res *UserData, err error) {
retries := 0
for retries <= metadataRetryBindPort {
port := rand.Intn(1024)
localTCPAddr, err := net.ResolveTCPAddr("tcp", ":"+strconv.Itoa(port))
if err != nil {
return nil, errors.Wrap(err, "error resolving tcp address")
}
userdataClient := &http.Client{
Transport: &http.Transport{
DialContext: (&net.Dialer{
LocalAddr: localTCPAddr,
DualStack: false,
FallbackDelay: time.Second * -1,
}).DialContext,
},
}
resp, err := userdataClient.Get(metadataURL + "/user_data?format=json")
if err != nil {
retries++ // retry with a different source port
continue
}
defer resp.Body.Close()
userdata := &UserData{}
err = json.NewDecoder(resp.Body).Decode(userdata)
if err != nil {
return nil, errors.Wrap(err, "error decoding userdata")
}
return userdata, nil
}
return nil, errors.New("too many bind port retries for ListUserData")
}
// GetUserData returns the value for the given metadata key
func (*MetadataAPI) GetUserData(key string) ([]byte, error) {
if key == "" {
return make([]byte, 0), errors.New("key must not be empty in GetUserData")
}
retries := 0
for retries <= metadataRetryBindPort {
port := rand.Intn(1024)
localTCPAddr, err := net.ResolveTCPAddr("tcp", ":"+strconv.Itoa(port))
if err != nil {
return make([]byte, 0), errors.Wrap(err, "error resolving tcp address")
}
userdataClient := &http.Client{
Transport: &http.Transport{
DialContext: (&net.Dialer{
LocalAddr: localTCPAddr,
DualStack: false,
FallbackDelay: time.Second * -1,
}).DialContext,
},
}
resp, err := userdataClient.Get(metadataURL + "/user_data/" + key)
if err != nil {
retries++ // retry with a different source port
continue
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return make([]byte, 0), errors.Wrap(err, "error reading userdata body")
}
return body, nil
}
return make([]byte, 0), errors.New("too may bind port retries for GetUserData")
}
// SetUserData sets the userdata key with the given value
func (*MetadataAPI) SetUserData(key string, value []byte) error {
if key == "" {
return errors.New("key must not be empty in SetUserData")
}
retries := 0
for retries <= metadataRetryBindPort {
port := rand.Intn(1024)
localTCPAddr, err := net.ResolveTCPAddr("tcp", ":"+strconv.Itoa(port))
if err != nil {
return errors.Wrap(err, "error resolving tcp address")
}
userdataClient := &http.Client{
Transport: &http.Transport{
DialContext: (&net.Dialer{
LocalAddr: localTCPAddr,
DualStack: false,
FallbackDelay: time.Second * -1,
}).DialContext,
},
}
request, err := http.NewRequest("PATCH", metadataURL+"/user_data/"+key, bytes.NewBuffer(value))
if err != nil {
return errors.Wrap(err, "error creating patch userdata request")
}
request.Header.Set("Content-Type", "text/plain")
_, err = userdataClient.Do(request)
if err != nil {
retries++ // retry with a different source port
continue
}
return nil
}
return errors.New("too may bind port retries for SetUserData")
}
// DeleteUserData deletes the userdata key and the associated value
func (*MetadataAPI) DeleteUserData(key string) error {
if key == "" {
return errors.New("key must not be empty in DeleteUserData")
}
retries := 0
for retries <= metadataRetryBindPort {
port := rand.Intn(1024)
localTCPAddr, err := net.ResolveTCPAddr("tcp", ":"+strconv.Itoa(port))
if err != nil {
return errors.Wrap(err, "error resolving tcp address")
}
userdataClient := &http.Client{
Transport: &http.Transport{
DialContext: (&net.Dialer{
LocalAddr: localTCPAddr,
DualStack: false,
FallbackDelay: time.Second * -1,
}).DialContext,
},
}
request, err := http.NewRequest("DELETE", metadataURL+"/user_data/"+key, bytes.NewBuffer([]byte("")))
if err != nil {
return errors.Wrap(err, "error creating delete userdata request")
}
_, err = userdataClient.Do(request)
if err != nil {
retries++ // retry with a different source port
continue
}
return nil
}
return errors.New("too may bind port retries for DeleteUserData")
}
// UserData represents the user data
type UserData struct {
UserData []string `json:"user_data,omitempty"`
}