/
main.go
336 lines (266 loc) · 8.59 KB
/
main.go
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package main
import (
"fmt"
"github.com/digitalocean/godo"
"golang.org/x/oauth2"
"log"
"io/ioutil"
"os/user"
"strconv"
"strings"
"github.com/dropbox/godropbox/errors"
"golang.org/x/crypto/ssh"
"bytes"
"flag"
)
// FIXME: be able to configure the used SSH key
func main() {
fmt.Println("running digital ocean setup script..")
pat, err := ReadTokenFromConfigFile()
if err != nil {
log.Println(err)
return
}
tokenSource := &TokenSource{
AccessToken: pat,
}
oauthClient := oauth2.NewClient(oauth2.NoContext, tokenSource)
client := godo.NewClient(oauthClient)
cmd := flag.String("c", "list", "command: list ; delete ; create ; install")
slaveCount := flag.Int("slaves", 5, "slave count argument used upon creation")
procType := flag.String("type", "", "which type of nodes to install (slave/master). unspecified means all")
procArgs := flag.String("args", "", "arguments to that specific process")
flag.Parse()
droplets, err := DropletList(client)
if err != nil {
log.Println(err)
return
}
switch (*cmd) {
case "list":
log.Println(droplets)
case "delete":
err = RemoveAllDroplets(client)
case "create":
err = createMasterSlaveDroplets(client, *slaveCount)
case "install":
runMaster := false
runSlaves := false
switch *procType {
case "": runMaster = true ; runSlaves = true
case "slave": runSlaves = true
case "master": runMaster = true
default:
log.Fatal("unknown install type " + *procType)
return
}
master, slaves := GetTentacularDroplets(droplets)
err = RunTentacularOnDroplets(master, slaves, runMaster, runSlaves, *procArgs)
default:
log.Fatal("unknown command " + *cmd)
return
}
if err != nil {
log.Println(err)
return
}
}
func createMasterSlaveDroplets(client *godo.Client, slaveCount int) (err error) {
sshKeys := []godo.DropletCreateSSHKey{godo.DropletCreateSSHKey{Fingerprint: "9e:6a:0b:3d:0a:d1:af:c6:7f:d3:00:aa:b3:a1:ed:dc"}}
log.Println("creating master... ")
_, err = createSmallDroplet(client, "master", sshKeys)
if err != nil { return }
for i := 0; i < slaveCount; i++ {
slaveName := "slave" + strconv.Itoa(i)
log.Println("creating slave with name " + slaveName)
_, err = createSmallDroplet(client, slaveName, sshKeys)
if err != nil { return }
}
return
}
func createSmallDroplet(client *godo.Client, dropletName string, sshKeys []godo.DropletCreateSSHKey) (*godo.Droplet, error) {
// Docker 1.10.1 on 14.04 in San Francisco
createRequest := &godo.DropletCreateRequest{
Name: dropletName,
Region: "sfo1",
Size: "512mb",
PrivateNetworking: true,
SSHKeys: sshKeys,
Image: godo.DropletCreateImage{
Slug: "docker",
},
}
newDroplet, _, err := client.Droplets.Create(createRequest)
return newDroplet, err
}
func RemoveAllDroplets(client *godo.Client) error {
log.Println("deleting all droplets...")
droplets, err := DropletList(client)
if err != nil {
return err
}
for _, droplet := range droplets {
_, err := client.Droplets.Delete(droplet.ID)
if (err != nil) {
return err
}
}
return nil
}
type TokenSource struct {
AccessToken string
}
func DropletList(client *godo.Client) ([]godo.Droplet, error) {
// create a list to hold our droplets
list := []godo.Droplet{}
// create options. initially, these will be blank
opt := &godo.ListOptions{}
for {
droplets, resp, err := client.Droplets.List(opt)
if err != nil {
return nil, err
}
// append the current page's droplets to our list
for _, d := range droplets {
list = append(list, d)
}
// if we are at the last page, break out the for loop
if resp.Links == nil || resp.Links.IsLastPage() {
break
}
page, err := resp.Links.CurrentPage()
if err != nil {
return nil, err
}
// set the page we want for the next request
opt.Page = page + 1
}
return list, nil
}
func ReadTokenFromConfigFile() (token string, err error) {
usr, err := user.Current()
if err != nil { return }
bytes, err := ioutil.ReadFile(usr.HomeDir + "/.digitalOceanToken")
if err != nil { return }
return string(bytes), err
}
func (t *TokenSource) Token() (*oauth2.Token, error) {
token := &oauth2.Token{
AccessToken: t.AccessToken,
}
return token, nil
}
func GetTentacularDroplets(droplets []godo.Droplet) (master *godo.Droplet, slaves []godo.Droplet) {
slaves = []godo.Droplet{}
for _, droplet := range droplets {
if IsMasterDroplet(&droplet) {
current := droplet
master = ¤t
} else if IsSlaveDroplet(&droplet) {
slaves = append(slaves, droplet)
}
}
return master, slaves
}
func RunTentacularOnDroplets(master *godo.Droplet, slaves []godo.Droplet,
runMaster, runSlaves bool, args string) (err error) {
nodeCount := 0
if runMaster { nodeCount++ }
if runSlaves { nodeCount += len(slaves) }
doneChan := make(chan error, nodeCount)
if runMaster {
go func() {
err = RunTentacularMaster(master, args)
doneChan <- err
}()
}
if runSlaves {
if len(slaves) == 0 {
return errors.New("No slave nodes available.")
}
masterPrivAddr, err := master.PrivateIPv4()
if err != nil { err = errors.Wrap(err, "") ; return err }
slaveCommand := fmt.Sprintf(RUN_PROXY_SLAVE, masterPrivAddr)
log.Print("Running command on slaves: " + slaveCommand)
for _, slave := range slaves {
slaveAddr, err := slave.PublicIPv4()
if err != nil {
fmt.Errorf("slave address could not be obtained. ignoring")
continue
}
go func() {
log.Println("running slave proxy at " + slaveAddr)
reString, err := RunRemoteCommand(slaveAddr, setupCmd(slaveCommand, args))
log.Println("slave terminated with output " + reString)
if err != nil {
log.Println("slave terminated with error.")
log.Println(err)
}
doneChan <- err
}()
}
}
log.Println("waiting for procs to finish..")
for i := 0; i < nodeCount; i++ {
<- doneChan
}
return nil
}
func RunTentacularMaster(master *godo.Droplet, args string) error {
if master == nil {
return errors.New("Missing master node.")
}
masterPubAddr, err := master.PublicIPv4()
if err != nil { err = errors.Wrap(err, "") ; return err }
masterCmd := setupCmd(RUN_PROXY_MASTER, args)
log.Print("Running command on master: " + masterCmd)
log.Println("Running master proxy at " + masterPubAddr)
reString, err := RunRemoteCommand(masterPubAddr, masterCmd)
log.Println("master terminated with output " + reString)
if err != nil {
log.Println("master terminated with error.")
log.Println(err)
}
return nil
}
func IsMasterDroplet(droplet *godo.Droplet) bool {
return strings.HasPrefix(droplet.Name, "master")
}
func IsSlaveDroplet(droplet *godo.Droplet) bool {
return strings.HasPrefix(droplet.Name, "slave")
}
func setupCmd(cmd string, args string) string {
return fmt.Sprintf("(%s %s); sleep 5", cmd, args)
}
// on a droplet assuming root user and ssh key at id_rsa.pub deployed
func RunRemoteCommand(addr string, command string) (s string, err error) {
usr, err := user.Current()
if err != nil { err = errors.Wrap(err, "") ; return }
authMethod, err := PublicKeyFile(usr.HomeDir + "/.ssh/id_rsa")
if err != nil { err = errors.Wrap(err, "") ; return }
sshConfig := &ssh.ClientConfig{
User: "root",
Auth: []ssh.AuthMethod{authMethod},
}
conn, err := ssh.Dial("tcp", addr + ":22", sshConfig)
if err != nil { err = errors.Wrap(err, "ssh dial failed.") ; return }
defer conn.Close()
session, err := conn.NewSession()
if err != nil { err = errors.Wrap(err, "session failed."); return }
defer session.Close()
var stdoutBuf bytes.Buffer
session.Stdout = &stdoutBuf
err = session.Run(command)
if err != nil { err = errors.Wrap(err, "cmd failed."); return }
return stdoutBuf.String(), nil
}
func PublicKeyFile(file string) (auth ssh.AuthMethod, err error) {
buffer, err := ioutil.ReadFile(file)
if err != nil { err = errors.Wrap(err, "") ; return }
key, err := ssh.ParsePrivateKey(buffer)
if err != nil { err = errors.Wrap(err, "") ; return }
return ssh.PublicKeys(key), nil
}
const RUN_PROXY_MASTER = DOCKER_REMOVE_ALL_CONTAINERS + "docker run -p 8080:8080 -p 6666:6666 --name master --rm danoctavian/tentacular /go/bin/app --type=master"
const RUN_PROXY_SLAVE = DOCKER_REMOVE_ALL_CONTAINERS + "docker run -p 8080:8080 --name slave --rm danoctavian/tentacular /go/bin/app --masterurl=\"http://%s:6666\""
const DOCKER_REMOVE_ALL_CONTAINERS = "docker rm --force `docker ps -qa`;"