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jupiterbrain.go
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jupiterbrain.go
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package backend
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"regexp"
"time"
gocontext "context"
"github.com/cenk/backoff"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/travis-ci/worker/config"
"github.com/travis-ci/worker/context"
"github.com/travis-ci/worker/image"
"github.com/travis-ci/worker/metrics"
"github.com/travis-ci/worker/ssh"
)
const (
defaultJupiterBrainImageSelectorType = "env"
defaultBootPollDialTimeout = 3 * time.Second
defaultBootPollWaitForError = 2 * time.Second
defaultJupiterBrainSSHDialTimeout = 5 * time.Second
)
var (
metricNameCleanRegexp = regexp.MustCompile(`[^A-Za-z0-9.:-_]+`)
jupiterBrainHelp = map[string]string{
"ENDPOINT": "[REQUIRED] url to Jupiter Brain server, including auth",
"SSH_KEY_PATH": "[REQUIRED] path to SSH key used to access job VMs",
"SSH_KEY_PASSPHRASE": "[REQUIRED] passphrase for SSH key given as SSH_KEY_PATH",
"KEYCHAIN_PASSWORD": "[REQUIRED] password used ... somehow",
"IMAGE_SELECTOR_TYPE": fmt.Sprintf("image selector type (\"env\" or \"api\", default %q)", defaultJupiterBrainImageSelectorType),
"IMAGE_SELECTOR_URL": "URL for image selector API, used only when image selector is \"api\"",
"IMAGE_ALIASES": "comma-delimited strings used as stable names for images (default: \"\")",
"IMAGE_ALIAS_{ALIAS}": "full name for a given alias given via IMAGE_ALIASES, where the alias form in the key is uppercased and normalized by replacing non-alphanumerics with _",
"BOOT_POLL_SLEEP": "sleep interval between polling server for instance status (default 3s)",
"BOOT_POLL_DIAL_TIMEOUT": "how long to wait for a TCP connection to be made when polling SSH port (default 3s)",
"BOOT_POLL_WAIT_FOR_ERROR": "time to wait for an error message after cancelling the boot polling (default 2s)",
"SSH_DIAL_TIMEOUT": fmt.Sprintf("connection timeout for ssh connections (default %v)", defaultJupiterBrainSSHDialTimeout),
}
)
const (
wrapperSh = `#!/bin/bash
[[ $(uname) = Linux ]] && exec bash ~/build.sh
[[ -f ~/build.sh.exit ]] && rm ~/build.sh.exit
until nc 127.0.0.1 15782; do sleep 1; done
until [[ -f ~/build.sh.exit ]]; do sleep 1; done
exit $(cat ~/build.sh.exit)
`
)
func init() {
Register("jupiterbrain", "Jupiter Brain", jupiterBrainHelp, newJupiterBrainProvider)
}
type jupiterBrainProvider struct {
sshDialer ssh.Dialer
sshDialTimeout time.Duration
keychainPassword string
bootPollSleep time.Duration
bootPollDialTimeout time.Duration
bootPollWaitForError time.Duration
imageSelectorType string
imageSelector image.Selector
apiClient *jupiterBrainAPIClient
}
type jupiterBrainInstance struct {
payload *jupiterBrainInstancePayload
provider *jupiterBrainProvider
startupDuration time.Duration
}
type jupiterBrainInstancePayload struct {
ID string `json:"id"`
IPAddresses []string `json:"ip-addresses"`
State string `json:"state"`
BaseImage string `json:"base-image,omitempty"`
Type string `json:"type,omitempty"`
}
type jupiterBrainDataResponse struct {
Data []*jupiterBrainInstancePayload `json:"data"`
}
func newJupiterBrainProvider(cfg *config.ProviderConfig) (Provider, error) {
if !cfg.IsSet("ENDPOINT") {
return nil, ErrMissingEndpointConfig
}
baseURL, err := url.Parse(cfg.Get("ENDPOINT"))
if err != nil {
return nil, errors.Wrap(err, "error parsing Jupiter Brain endpoint URL")
}
sshDialTimeout := defaultJupiterBrainSSHDialTimeout
if cfg.IsSet("SSH_DIAL_TIMEOUT") {
sshDialTimeout, err = time.ParseDuration(cfg.Get("SSH_DIAL_TIMEOUT"))
if err != nil {
return nil, err
}
}
if !cfg.IsSet("SSH_KEY_PATH") {
return nil, errors.Errorf("expected SSH_KEY_PATH config key")
}
sshKeyPath := cfg.Get("SSH_KEY_PATH")
if !cfg.IsSet("SSH_KEY_PASSPHRASE") {
return nil, errors.Errorf("expected SSH_KEY_PASSPHRASE config key")
}
sshKeyPassphrase := cfg.Get("SSH_KEY_PASSPHRASE")
if !cfg.IsSet("KEYCHAIN_PASSWORD") {
return nil, errors.Errorf("expected KEYCHAIN_PASSWORD config key")
}
sshDialer, err := ssh.NewDialer(sshKeyPath, sshKeyPassphrase)
if err != nil {
return nil, errors.Wrap(err, "couldn't set up SSH dialer")
}
keychainPassword := cfg.Get("KEYCHAIN_PASSWORD")
bootPollSleep := 3 * time.Second
if cfg.IsSet("BOOT_POLL_SLEEP") {
si, err := time.ParseDuration(cfg.Get("BOOT_POLL_SLEEP"))
if err != nil {
return nil, errors.Wrap(err, "error parsing boot pool sleep duration")
}
bootPollSleep = si
}
bootPollDialTimeout := defaultBootPollDialTimeout
if cfg.IsSet("BOOT_POLL_DIAL_TIMEOUT") {
si, err := time.ParseDuration(cfg.Get("BOOT_POLL_DIAL_TIMEOUT"))
if err != nil {
return nil, errors.Wrap(err, "error parsing boot pool dial timeout duration")
}
bootPollDialTimeout = si
}
bootPollWaitForError := defaultBootPollWaitForError
if cfg.IsSet("BOOT_POLL_WAIT_FOR_ERROR") {
si, err := time.ParseDuration(cfg.Get("BOOT_POLL_WAIT_FOR_ERROR"))
if err != nil {
return nil, errors.Wrap(err, "error parsing boot pool wait for error duration")
}
bootPollWaitForError = si
}
imageSelectorType := defaultJupiterBrainImageSelectorType
if cfg.IsSet("IMAGE_SELECTOR_TYPE") {
imageSelectorType = cfg.Get("IMAGE_SELECTOR_TYPE")
}
imageSelector, err := buildJupiterBrainImageSelector(imageSelectorType, cfg)
if err != nil {
return nil, err
}
return &jupiterBrainProvider{
sshDialer: sshDialer,
sshDialTimeout: sshDialTimeout,
keychainPassword: keychainPassword,
bootPollSleep: bootPollSleep,
bootPollDialTimeout: bootPollDialTimeout,
bootPollWaitForError: bootPollWaitForError,
imageSelectorType: imageSelectorType,
imageSelector: imageSelector,
apiClient: &jupiterBrainAPIClient{
client: http.DefaultClient,
baseURL: baseURL,
},
}, nil
}
func buildJupiterBrainImageSelector(selectorType string, cfg *config.ProviderConfig) (image.Selector, error) {
switch selectorType {
case "env":
return image.NewEnvSelector(cfg)
case "api":
baseURL, err := url.Parse(cfg.Get("IMAGE_SELECTOR_URL"))
if err != nil {
return nil, errors.Wrap(err, "error parsing image selector URL")
}
return image.NewAPISelector(baseURL), nil
default:
return nil, fmt.Errorf("invalid image selector type %q", selectorType)
}
}
func (p *jupiterBrainProvider) Start(ctx gocontext.Context, startAttributes *StartAttributes) (Instance, error) {
var (
imageName string
err error
)
if startAttributes.ImageName != "" {
imageName = startAttributes.ImageName
} else {
imageName, err = p.getImageName(ctx, startAttributes)
if err != nil {
return nil, errors.Wrap(err, "couldn't get image name")
}
}
logger := context.LoggerFromContext(ctx).WithField("self", "backend/jupiterbrain_provider")
logger.WithFields(logrus.Fields{
"image_name": imageName,
"osx_image": startAttributes.OsxImage,
"language": startAttributes.Language,
"dist": startAttributes.Dist,
"group": startAttributes.Group,
"os": startAttributes.OS,
}).Info("selected image name")
startBooting := time.Now()
// Start the instance
instancePayload, err := p.apiClient.Start(ctx, imageName)
if err != nil {
return nil, errors.Wrap(err, "error creating instance in Jupiter Brain")
}
// Sleep to allow the new instance to be fully visible
time.Sleep(p.bootPollSleep)
// Wait for instance to get IP address
ip, payload, err := p.waitForIP(ctx, instancePayload.ID)
if err != nil {
if ctx.Err() == gocontext.DeadlineExceeded {
metrics.Mark("worker.vm.provider.jupiterbrain.boot.timeout")
}
instance := &jupiterBrainInstance{
payload: instancePayload,
provider: p,
}
instance.Stop(ctx)
return nil, err
}
// Wait for SSH to be ready
err = p.waitForSSH(ctx, ip)
if err != nil {
if ctx.Err() == gocontext.DeadlineExceeded {
metrics.Mark("worker.vm.provider.jupiterbrain.boot.timeout")
}
instance := &jupiterBrainInstance{
payload: instancePayload,
provider: p,
}
instance.Stop(ctx)
return nil, err
}
metrics.TimeSince("worker.vm.provider.jupiterbrain.boot", startBooting)
normalizedImageName := string(metricNameCleanRegexp.ReplaceAll([]byte(imageName), []byte("-")))
metrics.TimeSince(fmt.Sprintf("worker.vm.provider.jupiterbrain.boot.image.%s", normalizedImageName), startBooting)
logger.WithField("instance_uuid", payload.ID).Info("booted instance")
if payload.BaseImage == "" {
payload.BaseImage = imageName
}
return &jupiterBrainInstance{
payload: payload,
provider: p,
startupDuration: time.Now().UTC().Sub(startBooting),
}, nil
}
func (p *jupiterBrainProvider) Setup(ctx gocontext.Context) error {
return nil
}
func (i *jupiterBrainInstance) UploadScript(ctx gocontext.Context, script []byte) error {
conn, err := i.sshConnection()
if err != nil {
return errors.Wrap(err, "couldn't connect to SSH server")
}
defer conn.Close()
existed, err := conn.UploadFile("build.sh", script)
if existed {
return ErrStaleVM
}
if err != nil {
return errors.Wrap(err, "couldn't upload build script")
}
_, err = conn.UploadFile("wrapper.sh", []byte(wrapperSh))
if err != nil {
return errors.Wrap(err, "couldn't upload wrapper.sh script")
}
return nil
}
func (i *jupiterBrainInstance) RunScript(ctx gocontext.Context, output io.Writer) (*RunResult, error) {
conn, err := i.sshConnection()
if err != nil {
return &RunResult{Completed: false}, errors.Wrap(err, "couldn't connect to SSH server")
}
defer conn.Close()
resultChan := make(chan struct {
exitStatus uint8
err error
}, 1)
go func() {
exitStatus, err := conn.RunCommand("bash ~/wrapper.sh", output)
resultChan <- struct {
exitStatus uint8
err error
}{
exitStatus,
err,
}
}()
select {
case <-ctx.Done():
return &RunResult{Completed: false}, ctx.Err()
case result := <-resultChan:
return &RunResult{Completed: result.err != nil, ExitCode: result.exitStatus}, errors.Wrap(err, "error running script")
}
}
func (i *jupiterBrainInstance) Stop(ctx gocontext.Context) error {
err := i.provider.apiClient.Stop(ctx, i.payload.ID)
return errors.Wrap(err, "error sending Stop request to Jupiter Brain")
}
func (i *jupiterBrainInstance) ID() string {
if i.payload == nil {
return "{unidentified}"
}
return i.payload.ID
}
func (i *jupiterBrainInstance) ImageName() string {
if i.payload == nil {
return "{unidentified}"
}
return i.payload.BaseImage
}
func (i *jupiterBrainInstance) StartupDuration() time.Duration {
return i.startupDuration
}
func (i *jupiterBrainInstance) sshConnection() (ssh.Connection, error) {
var ip net.IP
for _, ipString := range i.payload.IPAddresses {
curIP := net.ParseIP(ipString)
if curIP.To4() != nil {
ip = curIP
break
}
}
if ip == nil {
return nil, errors.Errorf("no valid IPv4 address")
}
return i.provider.sshDialer.Dial(fmt.Sprintf("%s:22", ip.String()), "travis", i.provider.sshDialTimeout)
}
func (p *jupiterBrainProvider) getImageName(ctx gocontext.Context, startAttributes *StartAttributes) (string, error) {
jobID, _ := context.JobIDFromContext(ctx)
repo, _ := context.RepositoryFromContext(ctx)
return p.imageSelector.Select(&image.Params{
Infra: "jupiterbrain",
Language: startAttributes.Language,
OsxImage: startAttributes.OsxImage,
Dist: startAttributes.Dist,
Group: startAttributes.Group,
OS: startAttributes.OS,
JobID: jobID,
Repo: repo,
})
}
func (p *jupiterBrainProvider) waitForIP(ctx gocontext.Context, id string) (net.IP, *jupiterBrainInstancePayload, error) {
for {
if ctx.Err() != nil {
return nil, nil, errors.Errorf("cancelling waiting for instance to boot, was waiting for IP")
}
payload, err := p.apiClient.Get(ctx, id)
if err != nil {
return nil, nil, errors.Wrap(err, "error trying to refresh instance waiting for IP address")
}
for _, ipString := range payload.IPAddresses {
curIP := net.ParseIP(ipString)
if curIP.To4() != nil {
return curIP, payload, nil
}
}
select {
case <-time.After(p.bootPollSleep):
case <-ctx.Done():
}
}
}
func (p *jupiterBrainProvider) waitForSSH(ctx gocontext.Context, ip net.IP) error {
for {
if ctx.Err() != nil {
return errors.Errorf("cancelling waiting for instance to boot, was waiting for SSH to come up")
}
dialer := &net.Dialer{
Timeout: p.bootPollDialTimeout,
}
conn, err := dialer.DialContext(ctx, "tcp", fmt.Sprintf("%s:22", ip.String()))
if conn != nil {
conn.Close()
}
if err == nil {
return nil
}
select {
case <-time.After(p.bootPollSleep):
case <-ctx.Done():
}
}
}
type jupiterBrainAPIClient struct {
client *http.Client
baseURL *url.URL
}
func (ac *jupiterBrainAPIClient) Start(ctx gocontext.Context, baseImage string) (*jupiterBrainInstancePayload, error) {
bodyPayload := map[string]map[string]string{
"data": {
"type": "instances",
"base-image": baseImage,
},
}
jsonBody, err := json.Marshal(bodyPayload)
if err != nil {
return nil, errors.Wrap(err, "couldn't marshal instance create request to JSON")
}
u, err := ac.baseURL.Parse("instances")
if err != nil {
return nil, errors.Wrap(err, "couldn't create create-instance URL")
}
req, err := http.NewRequest("POST", u.String(), bytes.NewReader(jsonBody))
if err != nil {
return nil, errors.Wrap(err, "couldn't create instance create request")
}
req.Header.Set("Content-Type", "application/vnd.api+json")
resp, err := ac.httpDo(req)
if err != nil {
return nil, errors.Wrap(err, "error sending create instance request")
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
body, _ := ioutil.ReadAll(resp.Body)
return nil, errors.Errorf("expected 2xx from Jupiter Brain API, got %d (error: %s)", resp.StatusCode, body)
}
dataPayload := &jupiterBrainDataResponse{}
err = json.NewDecoder(resp.Body).Decode(dataPayload)
if err != nil {
return nil, errors.Wrap(err, "couldn't decode payload from Jupiter Brain")
}
if len(dataPayload.Data) != 1 {
return nil, errors.Wrapf(err, "expected 1 instance to be returned, but got %d", len(dataPayload.Data))
}
return dataPayload.Data[0], nil
}
func (ac *jupiterBrainAPIClient) Get(ctx gocontext.Context, id string) (*jupiterBrainInstancePayload, error) {
u, err := ac.baseURL.Parse(fmt.Sprintf("instances/%s", url.QueryEscape(id)))
if err != nil {
return nil, errors.Wrap(err, "couldn't create fetch-instance URL")
}
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
return nil, errors.Wrap(err, "couldn't create instance fetch request")
}
resp, err := ac.httpDo(req)
if err != nil {
return nil, errors.Wrap(err, "error sending fetch instance request")
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
body, _ := ioutil.ReadAll(resp.Body)
return nil, errors.Errorf("unknown status code: %d, expected 200 (body: %q)", resp.StatusCode, string(body))
}
dataPayload := &jupiterBrainDataResponse{}
err = json.NewDecoder(resp.Body).Decode(dataPayload)
if err != nil {
_ = resp.Body.Close()
return nil, errors.Wrap(err, "couldn't decode payload from Jupiter Brain")
}
if len(dataPayload.Data) != 1 {
return nil, errors.Wrapf(err, "expected 1 instance to be returned, but got %d", len(dataPayload.Data))
}
return dataPayload.Data[0], nil
}
func (ac *jupiterBrainAPIClient) Stop(ctx gocontext.Context, id string) error {
u, err := ac.baseURL.Parse(fmt.Sprintf("instances/%s", url.QueryEscape(id)))
if err != nil {
return errors.Wrap(err, "error creating instance stop URL")
}
req, err := http.NewRequest("DELETE", u.String(), nil)
if err != nil {
return errors.Wrap(err, "error creating instance stop request")
}
resp, err := ac.httpDo(req)
if err != nil {
return errors.Wrap(err, "error sending instance stop request")
}
resp.Body.Close()
return nil
}
func (ac *jupiterBrainAPIClient) httpDo(req *http.Request) (*http.Response, error) {
if req.URL.User != nil {
token := req.URL.User.Username()
req.URL.User = nil
req.Header.Set("Authorization", "token "+token)
}
var resp *http.Response
b := backoff.NewExponentialBackOff()
b.MaxInterval = 10 * time.Second
b.MaxElapsedTime = time.Minute
err := backoff.Retry(func() (err error) {
resp, err = ac.client.Do(req)
return
}, b)
return resp, err
}