mirror of https://github.com/k3s-io/k3s
114 lines
2.9 KiB
Go
114 lines
2.9 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package azure
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import (
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"encoding/json"
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"io/ioutil"
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"net/http"
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)
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const metadataURL = "http://169.254.169.254/metadata/"
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// NetworkMetadata contains metadata about an instance's network
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type NetworkMetadata struct {
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Interface []NetworkInterface `json:"interface"`
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}
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// NetworkInterface represents an instances network interface.
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type NetworkInterface struct {
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IPV4 NetworkData `json:"ipv4"`
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IPV6 NetworkData `json:"ipv6"`
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MAC string `json:"macAddress"`
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}
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// NetworkData contains IP information for a network.
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type NetworkData struct {
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IPAddress []IPAddress `json:"ipAddress"`
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Subnet []Subnet `json:"subnet"`
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}
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// IPAddress represents IP address information.
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type IPAddress struct {
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PrivateIP string `json:"privateIPAddress"`
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PublicIP string `json:"publicIPAddress"`
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}
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// Subnet represents subnet information.
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type Subnet struct {
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Address string `json:"address"`
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Prefix string `json:"prefix"`
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}
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// InstanceMetadata knows how to query the Azure instance metadata server.
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type InstanceMetadata struct {
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baseURL string
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}
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// NewInstanceMetadata creates an instance of the InstanceMetadata accessor object.
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func NewInstanceMetadata() *InstanceMetadata {
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return &InstanceMetadata{
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baseURL: metadataURL,
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}
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}
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// makeMetadataURL makes a complete metadata URL from the given path.
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func (i *InstanceMetadata) makeMetadataURL(path string) string {
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return i.baseURL + path
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}
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// Object queries the metadata server and populates the passed in object
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func (i *InstanceMetadata) Object(path string, obj interface{}) error {
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data, err := i.queryMetadataBytes(path, "json")
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if err != nil {
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return err
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}
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return json.Unmarshal(data, obj)
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}
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// Text queries the metadata server and returns the corresponding text
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func (i *InstanceMetadata) Text(path string) (string, error) {
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data, err := i.queryMetadataBytes(path, "text")
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if err != nil {
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return "", err
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}
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return string(data), err
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}
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func (i *InstanceMetadata) queryMetadataBytes(path, format string) ([]byte, error) {
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client := &http.Client{}
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req, err := http.NewRequest("GET", i.makeMetadataURL(path), nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Metadata", "True")
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q := req.URL.Query()
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q.Add("format", format)
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q.Add("api-version", "2017-04-02")
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req.URL.RawQuery = q.Encode()
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resp, err := client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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return ioutil.ReadAll(resp.Body)
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}
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