142 lines
3.5 KiB
Go
142 lines
3.5 KiB
Go
package ec2
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import (
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"bufio"
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"bytes"
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"encoding/json"
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"fmt"
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"strings"
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"github.com/coreos/coreos-cloudinit/pkg"
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)
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const (
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DefaultAddress = "http://169.254.169.254/"
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apiVersion = "2009-04-04"
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userdataUrl = apiVersion + "/user-data"
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metadataUrl = apiVersion + "/meta-data"
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)
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type metadataService struct {
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root string
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client pkg.Getter
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}
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func NewDatasource(root string) *metadataService {
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if !strings.HasSuffix(root, "/") {
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root += "/"
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}
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return &metadataService{root, pkg.NewHttpClient()}
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}
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func (ms metadataService) IsAvailable() bool {
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_, err := ms.client.Get(ms.root + apiVersion)
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return (err == nil)
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}
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func (ms metadataService) AvailabilityChanges() bool {
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return true
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}
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func (ms metadataService) ConfigRoot() string {
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return ms.root
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}
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func (ms metadataService) FetchMetadata() ([]byte, error) {
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attrs := make(map[string]interface{})
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if keynames, err := fetchAttributes(ms.client, fmt.Sprintf("%s/public-keys", ms.metadataUrl())); err == nil {
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keyIDs := make(map[string]string)
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for _, keyname := range keynames {
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tokens := strings.SplitN(keyname, "=", 2)
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if len(tokens) != 2 {
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return nil, fmt.Errorf("malformed public key: %q", keyname)
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}
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keyIDs[tokens[1]] = tokens[0]
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}
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keys := make(map[string]string)
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for name, id := range keyIDs {
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sshkey, err := fetchAttribute(ms.client, fmt.Sprintf("%s/public-keys/%s/openssh-key", ms.metadataUrl(), id))
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if err != nil {
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return nil, err
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}
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keys[name] = sshkey
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fmt.Printf("Found SSH key for %q\n", name)
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}
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attrs["public_keys"] = keys
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return nil, err
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}
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if hostname, err := fetchAttribute(ms.client, fmt.Sprintf("%s/hostname", ms.metadataUrl())); err == nil {
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attrs["hostname"] = hostname
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return nil, err
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}
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if localAddr, err := fetchAttribute(ms.client, fmt.Sprintf("%s/local-ipv4", ms.metadataUrl())); err == nil {
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attrs["local-ipv4"] = localAddr
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return nil, err
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}
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if publicAddr, err := fetchAttribute(ms.client, fmt.Sprintf("%s/public-ipv4", ms.metadataUrl())); err == nil {
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attrs["public-ipv4"] = publicAddr
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return nil, err
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}
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if content_path, err := fetchAttribute(ms.client, fmt.Sprintf("%s/network_config/content_path", ms.metadataUrl())); err == nil {
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attrs["network_config"] = map[string]string{
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"content_path": content_path,
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}
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return nil, err
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}
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return json.Marshal(attrs)
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}
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func (ms metadataService) FetchUserdata() ([]byte, error) {
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if data, err := ms.client.GetRetry(ms.userdataUrl()); err == nil {
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return data, err
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} else if _, ok := err.(pkg.ErrNotFound); ok {
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return []byte{}, nil
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} else {
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return data, err
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}
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}
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func (ms metadataService) Type() string {
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return "ec2-metadata-service"
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}
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func (ms metadataService) metadataUrl() string {
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return (ms.root + metadataUrl)
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}
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func (ms metadataService) userdataUrl() string {
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return (ms.root + userdataUrl)
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}
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func fetchAttributes(client pkg.Getter, url string) ([]string, error) {
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resp, err := client.GetRetry(url)
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if err != nil {
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return nil, err
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}
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scanner := bufio.NewScanner(bytes.NewBuffer(resp))
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data := make([]string, 0)
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for scanner.Scan() {
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data = append(data, scanner.Text())
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}
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return data, scanner.Err()
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}
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func fetchAttribute(client pkg.Getter, url string) (string, error) {
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if attrs, err := fetchAttributes(client, url); err == nil && len(attrs) > 0 {
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return attrs[0], nil
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} else {
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return "", err
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}
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}
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