Merge pull request #2101 from furious-luke/master

Add a metadata provider for Vultr

pkg/metadata/main.go

@@ -47,7 +47,7 @@ var netProviders []Provider
 var cdromProviders []Provider
 
 func init() {
-	netProviders = []Provider{NewGCP(), NewAWS()}
+	netProviders = []Provider{NewGCP(), NewVultr(), NewAWS()}
 	cdromProviders = []Provider{NewCDROM()}
 }
 

pkg/metadata/provider_vultr.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path"
+	"time"
+)
+
+const (
+	vultrMetaDataURL = "http://169.254.169.254/v1/"
+)
+
+// ProviderVultr is the type implementing the Provider interface for Vultr
+type ProviderVultr struct {
+}
+
+// NewVultr returns a new ProviderVultr
+func NewVultr() *ProviderVultr {
+	return &ProviderVultr{}
+}
+
+func (p *ProviderVultr) String() string {
+	return "Vultr"
+}
+
+// Probe checks if we are running on Vultr
+func (p *ProviderVultr) Probe() bool {
+	// Getting the index should always work...
+	_, err := vultrGet(vultrMetaDataURL)
+	return (err == nil)
+}
+
+// Extract gets both the Vultr specific and generic userdata
+func (p *ProviderVultr) Extract() ([]byte, error) {
+	// Get host name. This must not fail
+	hostname, err := vultrGet(vultrMetaDataURL + "hostname")
+	if err != nil {
+		return nil, err
+	}
+	err = ioutil.WriteFile(path.Join(ConfigPath, Hostname), hostname, 0644)
+	if err != nil {
+		return nil, fmt.Errorf("Vultr: Failed to write hostname: %s", err)
+	}
+
+	// public ipv4
+	vultrMetaGet("interfaces/0/ipv4/address", "public_ipv4", 0644)
+
+	// private ipv4
+	vultrMetaGet("interfaces/1/ipv4/address", "private_ipv4", 0644)
+
+	// private netmask
+	vultrMetaGet("interfaces/1/ipv4/netmask", "private_netmask", 0644)
+
+	// region code
+	vultrMetaGet("region/regioncode", "region_code", 0644)
+
+	// instance-id
+	vultrMetaGet("instanceid", "instance_id", 0644)
+
+	return nil, nil
+}
+
+// lookup a value (lookupName) in Vultr metaservice and store in given fileName
+func vultrMetaGet(lookupName string, fileName string, fileMode os.FileMode) {
+	if lookupValue, err := vultrGet(vultrMetaDataURL + lookupName); err == nil {
+		// we got a value from the metadata server, now save to filesystem
+		err = ioutil.WriteFile(path.Join(ConfigPath, fileName), lookupValue, fileMode)
+		if err != nil {
+			// we couldn't save the file for some reason
+			log.Printf("Vultr: Failed to write %s:%s %s", fileName, lookupValue, err)
+		}
+	} else {
+		// we did not get a value back from the metadata server
+		log.Printf("Vultr: Failed to get %s: %s", lookupName, err)
+	}
+}
+
+// vultrGet requests and extracts the requested URL
+func vultrGet(url string) ([]byte, error) {
+	var client = &http.Client{
+		Timeout: time.Second * 2,
+	}
+
+	req, err := http.NewRequest("", url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("Vultr: http.NewRequest failed: %s", err)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("Vultr: Could not contact metadata service: %s", err)
+	}
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("Vultr: Status not ok: %d", resp.StatusCode)
+	}
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("Vultr: Failed to read http response: %s", err)
+	}
+	return body, nil
+}
+
+// SSH keys:
+func (p *ProviderVultr) handleSSH() error {
+	sshKeys, err := vultrGet(vultrMetaDataURL + "public-keys")
+	if err != nil {
+		return fmt.Errorf("Failed to get sshKeys: %s", err)
+	}
+
+	if err := os.Mkdir(path.Join(ConfigPath, SSH), 0755); err != nil {
+		return fmt.Errorf("Failed to create %s: %s", SSH, err)
+	}
+
+	err = ioutil.WriteFile(path.Join(ConfigPath, SSH, "authorized_keys"), sshKeys, 0600)
+	if err != nil {
+		return fmt.Errorf("Failed to write ssh keys: %s", err)
+	}
+	return nil
+}