mirror of
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129 lines
2.9 KiB
Go
Executable File
129 lines
2.9 KiB
Go
Executable File
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package waagent
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import (
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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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"github.com/rancher/os/log"
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"github.com/rancher/os/config/cloudinit/datasource"
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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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lastError error
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}
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func NewDatasource(root string) *Waagent {
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return &Waagent{root, ioutil.ReadFile, nil}
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}
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func (a *Waagent) IsAvailable() bool {
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_, a.lastError = os.Stat(path.Join(a.root, "provisioned"))
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return !os.IsNotExist(a.lastError)
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}
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func (a *Waagent) Finish() error {
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return nil
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}
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func (a *Waagent) String() string {
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return fmt.Sprintf("%s: %s (lastError: %s)", a.Type(), a.root, a.lastError)
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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() (metadata datasource.Metadata, err error) {
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var metadataBytes []byte
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if metadataBytes, err = a.tryReadFile(path.Join(a.root, "SharedConfig.xml")); err != nil {
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return
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}
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if len(metadataBytes) == 0 {
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return
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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 m SharedConfig
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if err = xml.Unmarshal(metadataBytes, &m); err != nil {
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return
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}
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var instance Instance
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for _, i := range m.Instances.Instances {
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if i.ID == m.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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metadata.PrivateIPv4 = net.ParseIP(instance.Address)
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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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metadata.PublicIPv4 = net.ParseIP(host)
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break
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}
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}
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return
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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) 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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log.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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