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// Package linode provides node discovery for Linode.
package linode
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/linode/linodego"
"golang.org/x/oauth2"
)
type Filter struct {
Region string `json:"region,omitempty"`
Tag string `json:"tags,omitempty"`
}
type Provider struct {
userAgent string
}
func (p *Provider) SetUserAgent(s string) {
p.userAgent = s
}
func (p *Provider) Help() string {
return `Linode:
provider: "linode"
api_token: The Linode API token to use
region: The Linode region to filter on
tag_name: The tag name to filter on
address_type: "private_v4", "public_v4", "private_v6" or "public_v6". (default: "private_v4")
Variables can also be provided by environment variables:
export LINODE_TOKEN for api_token
`
}
func (p *Provider) Addrs(args map[string]string, l *log.Logger) ([]string, error) {
if args["provider"] != "linode" {
return nil, fmt.Errorf("discover-linode: invalid provider " + args["provider"])
}
if l == nil {
l = log.New(ioutil.Discard, "", 0)
}
addressType := args["address_type"]
region := args["region"]
tagName := args["tag_name"]
apiToken := argsOrEnv(args, "api_token", "LINODE_TOKEN")
l.Printf("[DEBUG] discover-linode: Using address_type=%s region=%s tag_name=%s", addressType, region, tagName)
client := getLinodeClient(p.userAgent, apiToken)
filters := Filter{
Region: "",
Tag: "",
}
if region != "" {
filters.Region = region
}
if tagName != "" {
filters.Tag = tagName
}
jsonFilters, _ := json.Marshal(filters)
filterOpt := linodego.ListOptions{Filter: string(jsonFilters)}
linodes, err := client.ListInstances(context.Background(), &filterOpt)
if err != nil {
return nil, fmt.Errorf("discover-linode: Fetching Linode instances failed: %s", err)
}
var addrs []string
for _, linode := range linodes {
addr, err := client.GetInstanceIPAddresses(context.Background(), linode.ID)
if err != nil {
return nil, fmt.Errorf("discover-linode: Fetching Linode IP address for instance %v failed: %s", linode.ID, err)
}
switch addressType {
case "public_v4":
if len(addr.IPv4.Public) == 0 {
break
}
addrs = append(addrs, addr.IPv4.Public[0].Address)
case "private_v4":
if len(addr.IPv4.Private) == 0 {
break
}
addrs = append(addrs, addr.IPv4.Private[0].Address)
case "public_v6":
if addr.IPv6.SLAAC.Address == "" {
break
}
addrs = append(addrs, addr.IPv6.SLAAC.Address)
case "private_v6":
if addr.IPv6.LinkLocal.Address == "" {
break
}
addrs = append(addrs, addr.IPv6.LinkLocal.Address)
default:
if len(addr.IPv4.Private) == 0 {
break
}
addrs = append(addrs, addr.IPv4.Private[0].Address)
}
}
return addrs, nil
}
func getLinodeClient(userAgent, apiToken string) linodego.Client {
tokenSource := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: apiToken})
oauth2Client := &http.Client{
Transport: &oauth2.Transport{
Source: tokenSource,
},
}
client := linodego.NewClient(oauth2Client)
if userAgent != "" {
client.SetUserAgent(userAgent)
}
return client
}
func argsOrEnv(args map[string]string, key, env string) string {
if value := args[key]; value != "" {
return value
}
return os.Getenv(env)
}
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