109 lines
2.1 KiB
Go
109 lines
2.1 KiB
Go
package waagent
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import (
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"encoding/json"
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"encoding/xml"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"path"
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)
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type waagent struct {
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root string
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readFile func(filename string) ([]byte, error)
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}
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func NewDatasource(root string) *waagent {
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return &waagent{root, ioutil.ReadFile}
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}
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func (a *waagent) IsAvailable() bool {
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_, err := os.Stat(path.Join(a.root, "provisioned"))
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return !os.IsNotExist(err)
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}
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func (a *waagent) AvailabilityChanges() bool {
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return true
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}
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func (a *waagent) ConfigRoot() string {
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return a.root
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}
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func (a *waagent) FetchMetadata() ([]byte, error) {
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metadataBytes, err := a.tryReadFile(path.Join(a.root, "SharedConfig.xml"))
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if err != nil {
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return nil, err
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}
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if len(metadataBytes) == 0 {
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return metadataBytes, nil
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}
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type Instance struct {
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Id string `xml:"id,attr"`
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Address string `xml:"address,attr"`
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InputEndpoints struct {
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Endpoints []struct {
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LoadBalancedPublicAddress string `xml:"loadBalancedPublicAddress,attr"`
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} `xml:"Endpoint"`
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}
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}
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type SharedConfig struct {
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Incarnation struct {
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Instance string `xml:"instance,attr"`
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}
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Instances struct {
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Instances []Instance `xml:"Instance"`
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}
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}
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var metadata SharedConfig
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if err := xml.Unmarshal(metadataBytes, &metadata); err != nil {
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return nil, err
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}
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var instance Instance
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for _, i := range metadata.Instances.Instances {
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if i.Id == metadata.Incarnation.Instance {
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instance = i
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break
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}
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}
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attrs := map[string]string{
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"local-ipv4": instance.Address,
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}
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for _, e := range instance.InputEndpoints.Endpoints {
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host, _, err := net.SplitHostPort(e.LoadBalancedPublicAddress)
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if err == nil {
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attrs["public-ipv4"] = host
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break
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}
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}
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return json.Marshal(attrs)
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}
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func (a *waagent) FetchUserdata() ([]byte, error) {
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return a.tryReadFile(path.Join(a.root, "CustomData"))
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}
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func (a *waagent) FetchNetworkConfig(filename string) ([]byte, error) {
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return nil, nil
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}
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func (a *waagent) Type() string {
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return "waagent"
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}
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func (a *waagent) tryReadFile(filename string) ([]byte, error) {
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fmt.Printf("Attempting to read from %q\n", filename)
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data, err := a.readFile(filename)
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if os.IsNotExist(err) {
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err = nil
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}
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return data, err
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}
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