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vultr.go
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vultr.go
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package main
import (
"context"
"encoding/json"
"fmt"
"github.com/vultr/govultr"
"os"
"sort"
"strconv"
"strings"
"sync"
)
var APIKey = os.Getenv("VULTR_KEY")
func DumpServerInfo(path string, servers []govultr.Server) {
usrhome, err := os.UserHomeDir()
if err != nil {
fmt.Println("error obtaining user home: ", err)
os.Exit(1)
}
keypath := usrhome + "/.ssh/vultr"
var dt []Server
for _, s := range servers {
dt = append(dt, Server{
ID: s.InstanceID,
PrivateIP: s.MainIP,
PublicIP: s.MainIP,
Location: s.Location,
Tag: s.Tag,
Provider: "vultr",
User: "root",
KeyPath: keypath,
Port: 22,
})
}
sort.Sort(ServerByLocation(dt))
f, err := os.Create(path)
if err != nil {
fmt.Println("error creating file: ", err)
os.Exit(1)
}
defer f.Close()
enc := json.NewEncoder(f)
enc.SetIndent("", " ")
enc.Encode(dt)
}
func CheckServerStatus(tag string) []govultr.Server {
// start the client
c := govultr.NewClient(nil, APIKey)
// query the servers by tag or simply list them all
var servers []govultr.Server
var err error
if tag == "" {
servers, err = c.Server.List(context.Background())
} else {
servers, err = c.Server.ListByTag(context.Background(), tag)
}
if err != nil {
fmt.Println("error listing servers: ", err)
os.Exit(1)
}
nActive := 0
nPending := 0
nOK := 0
nInstalling := 0
for _, s := range servers {
switch s.Status {
case "active":
nActive += 1
switch s.ServerState {
case "ok":
nOK += 1
case "installingbooting":
nInstalling += 1
}
case "pending":
nPending += 1
}
}
fmt.Printf("%v total, %v active (%v ok, %v installing), %v pending\n", len(servers), nActive, nOK, nInstalling, nPending)
return servers
}
// StartServers starts one server on each datacenter location. It associates the servers with
// the given tag.
func StartServers(tag string, price float64, location string, count int) []govultr.Server {
// start the client
c := govultr.NewClient(nil, APIKey)
// check the list of vc2 instance types and get the one that costs $5 per month
plans, err := c.Plan.GetVc2List(context.Background())
if err != nil {
fmt.Println("error listing available plans: ", err)
os.Exit(1)
}
var plan govultr.VCPlan
for _, v := range plans {
p, err := strconv.ParseFloat(v.Price, 64)
if err != nil {
fmt.Println("invalid plan price: ", err)
os.Exit(1)
}
if p == price {
plan = v
break
}
}
if plan.PlanID == "" {
fmt.Println("unable to find the plan")
os.Exit(1)
}
planID, err := strconv.Atoi(plan.PlanID)
if err != nil {
fmt.Println("invalid plan id: ", err)
os.Exit(1)
}
// get the list of regions that supports the desired VC2 instance
regions, err := c.Region.List(context.Background())
if err != nil {
fmt.Println("error listing available regions: ", err)
os.Exit(1)
}
var rids []int
for _, v := range regions {
rid, err := strconv.Atoi(v.RegionID)
if err != nil {
fmt.Println("invalid region id: ", err)
os.Exit(1)
}
availableTypes, err := c.Region.Vc2Availability(context.Background(), rid)
if err != nil {
fmt.Println("error listing supported plans: ", err)
os.Exit(1)
}
// look for the plan
found := false
for _, t := range availableTypes {
if t == planID {
found = true
break
}
}
if found {
// if we are matching against location
if location != "" {
loc := strings.ToLower(v.Name)
q := strings.ToLower(location)
if !strings.Contains(loc, q) {
continue
}
}
rids = append(rids, rid)
}
}
fmt.Printf("Found %v regions that support the $%.1f plan\n", len(rids), price)
// get the ssh key
sshkey, err := c.SSHKey.List(context.Background())
if err != nil {
fmt.Println("error listing ssh keys: ", err)
os.Exit(1)
}
kid := ""
for _, v := range sshkey {
if v.Name == "macOS Testbed" {
kid = v.SSHKeyID
break
}
}
if kid == "" {
fmt.Println("unable to find the ssh key")
os.Exit(1)
}
fmt.Printf("Using SSH Key %v\n", kid)
// get the OS
oses, err := c.OS.List(context.Background())
if err != nil {
fmt.Println("error listing os: ", err)
os.Exit(1)
}
osid := 0
for _, v := range oses {
if v.Name == "Ubuntu 20.04 x64" {
osid = v.OsID
break
}
}
if osid == 0 {
fmt.Println("unable to find the os")
os.Exit(1)
}
// get the startup script
scripts, err := c.StartupScript.List(context.Background())
if err != nil {
fmt.Println("error listing scripts: ", err)
os.Exit(1)
}
sid := ""
for _, v := range scripts {
if v.Name == "increase-sshmaxsessions" {
sid = v.ScriptID
break
}
}
if sid == "" {
fmt.Println("unable to find startup script")
os.Exit(1)
}
// start the servers with the given tag
opts := &govultr.ServerOptions{
Tag: tag,
SSHKeyIDs: []string{kid},
ScriptID: sid,
}
var servers []govultr.Server
for _, r := range rids {
for t := 0; t < count; t++ {
s, err := c.Server.Create(context.Background(), r, planID, osid, opts)
if err != nil {
fmt.Println("error creating server: ", err)
os.Exit(1)
}
servers = append(servers, *s)
}
}
fmt.Printf("Launched %v servers\n", len(servers))
return servers
}
func StopServers(tag string) {
// start the client
c := govultr.NewClient(nil, APIKey)
// get the list of servers matching the tag
servers, err := c.Server.ListByTag(context.Background(), tag)
if err != nil {
fmt.Println("error listing servers by tag: ", err)
os.Exit(1)
}
// shut down the servers
for _, s := range servers {
// first check the state of the server. we can only shutdown when the server is "ok"
if s.Status == "pending" || s.Status == "closed" {
fmt.Printf("Skipping %v due to status %v\n", s.InstanceID, s.Status)
continue
}
if s.ServerState == "locked" {
fmt.Printf("Skipping %v due to state %v\n", s.InstanceID, s.ServerState)
continue
}
err = c.Server.Delete(context.Background(), s.InstanceID)
if err != nil {
fmt.Println("error deleting server: ", err)
os.Exit(1)
}
}
// check the remaining number of servers
servers, err = c.Server.List(context.Background())
if err != nil {
fmt.Println("error listing servers: ", err)
os.Exit(1)
}
fmt.Printf("%v servers remaining\n", len(servers))
}
func RestartServers(tag string) {
// start the client
c := govultr.NewClient(nil, APIKey)
// get the list of servers matching the tag
servers, err := c.Server.ListByTag(context.Background(), tag)
if err != nil {
fmt.Println("error listing servers by tag: ", err)
os.Exit(1)
}
//reboot the servers
wg := &sync.WaitGroup{}
for _, s := range servers {
wg.Add(1)
go func(s govultr.Server) {
defer wg.Done()
// start a new client
c := govultr.NewClient(nil, APIKey)
// first check the state of the server. we can only shutdown when the server is "ok"
if s.Status == "pending" || s.Status == "closed" {
fmt.Printf("Skipping %v due to status %v\n", s.InstanceID, s.Status)
return
}
if s.ServerState == "locked" {
fmt.Printf("Skipping %v due to state %v\n", s.InstanceID, s.ServerState)
return
}
fmt.Println("Rebooting ", s.InstanceID)
err = c.Server.Reboot(context.Background(), s.InstanceID)
if err != nil {
fmt.Println("error rebooting server: ", err)
os.Exit(1)
}
}(s)
}
wg.Wait()
fmt.Println("Servers rebooted")
}