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jupiterbrain.go
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jupiterbrain.go
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package backend
import (
"bytes"
"crypto/x509"
"encoding/json"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"regexp"
"strings"
"time"
"github.com/Sirupsen/logrus"
"github.com/pkg/sftp"
"github.com/travis-ci/worker/config"
workerctx "github.com/travis-ci/worker/context"
"github.com/travis-ci/worker/metrics"
"golang.org/x/crypto/ssh"
"golang.org/x/net/context"
)
var (
nonAlphaNumRegexp = regexp.MustCompile(`[^a-zA-Z0-9_]+`)
)
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)
`
type JupiterBrainProvider struct {
client *http.Client
baseURL *url.URL
imageAliases map[string]string
sshKeyPath string
sshKeyPassphrase string
keychainPassword string
}
type JupiterBrainInstance struct {
payload *jupiterBrainInstancePayload
provider *JupiterBrainProvider
}
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) (*JupiterBrainProvider, error) {
if !cfg.IsSet("endpoint") {
return nil, ErrMissingEndpointConfig
}
if !cfg.IsSet("image_aliases") {
return nil, fmt.Errorf("expected image_aliases config key")
}
aliasNames := cfg.Get("image_aliases")
baseURL, err := url.Parse(cfg.Get("endpoint"))
if err != nil {
return nil, err
}
aliasNamesSlice := strings.Split(aliasNames, ",")
imageAliases := make(map[string]string, len(aliasNamesSlice))
for _, aliasName := range aliasNamesSlice {
normalizedAliasName := string(nonAlphaNumRegexp.ReplaceAll([]byte(aliasName), []byte("_")))
key := fmt.Sprintf("image_alias_%s", normalizedAliasName)
if !cfg.IsSet(key) {
return nil, fmt.Errorf("expected image alias %q", aliasName)
}
imageAliases[aliasName] = cfg.Get(key)
}
if !cfg.IsSet("ssh_key_path") {
return nil, fmt.Errorf("expected ssh_key_path config key")
}
sshKeyPath := cfg.Get("ssh_key_path")
if !cfg.IsSet("ssh_key_passphrase") {
return nil, fmt.Errorf("expected ssh_key_passphrase config key")
}
sshKeyPassphrase := cfg.Get("ssh_key_passphrase")
if !cfg.IsSet("keychain_password") {
return nil, fmt.Errorf("expected keychain_password config key")
}
keychainPassword := cfg.Get("keychain_password")
return &JupiterBrainProvider{
client: http.DefaultClient,
baseURL: baseURL,
imageAliases: imageAliases,
sshKeyPath: sshKeyPath,
sshKeyPassphrase: sshKeyPassphrase,
keychainPassword: keychainPassword,
}, nil
}
func (p *JupiterBrainProvider) Start(ctx context.Context, startAttributes *StartAttributes) (Instance, error) {
u, err := p.baseURL.Parse("instances")
if err != nil {
return nil, err
}
imageName := p.getImageName(startAttributes)
if imageName == "" {
return nil, fmt.Errorf("no image alias for %#v", startAttributes)
}
workerctx.LoggerFromContext(ctx).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()
bodyPayload := map[string]map[string]string{
"data": {
"type": "instances",
"base-image": imageName,
},
}
jsonBody, err := json.Marshal(bodyPayload)
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", u.String(), bytes.NewReader(jsonBody))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/vnd.api+json")
resp, err := p.httpDo(req)
if err != nil {
return nil, err
}
defer io.Copy(ioutil.Discard, resp.Body)
defer resp.Body.Close()
if c := resp.StatusCode; c < 200 || c >= 300 {
body, _ := ioutil.ReadAll(resp.Body)
return nil, fmt.Errorf("expected 2xx from Jupiter Brain API, got %d (error: %s)", c, body)
}
dataPayload := &jupiterBrainDataResponse{}
err = json.NewDecoder(resp.Body).Decode(dataPayload)
if err != nil {
workerctx.LoggerFromContext(ctx).WithFields(logrus.Fields{
"err": err,
"payload": dataPayload,
"body": resp.Body,
}).Error("couldn't decode created payload")
return nil, fmt.Errorf("couldn't decode created payload: %s", err)
}
payload := dataPayload.Data[0]
instanceReady := make(chan *jupiterBrainInstancePayload, 1)
errChan := make(chan error, 1)
go func(id string) {
u, err := p.baseURL.Parse(fmt.Sprintf("instances/%s", url.QueryEscape(id)))
if err != nil {
errChan <- err
return
}
req, err := http.NewRequest("GET", u.String(), nil)
if err != nil {
errChan <- err
return
}
for {
resp, err := p.httpDo(req)
if err != nil {
errChan <- err
return
}
if resp.StatusCode != 200 {
body, _ := ioutil.ReadAll(resp.Body)
errChan <- fmt.Errorf("unknown status code: %d, expected 200 (body: %q)", resp.StatusCode, string(body))
return
}
dataPayload := &jupiterBrainDataResponse{}
err = json.NewDecoder(resp.Body).Decode(dataPayload)
if err != nil {
errChan <- fmt.Errorf("couldn't decode refresh payload: %s", err)
return
}
payload := dataPayload.Data[0]
_, _ = io.Copy(ioutil.Discard, resp.Body)
_ = resp.Body.Close()
var ip net.IP
for _, ipString := range payload.IpAddresses {
curIp := net.ParseIP(ipString)
if curIp.To4() != nil {
ip = curIp
break
}
}
if ip == nil {
time.Sleep(500 * time.Millisecond)
continue
}
conn, err := net.Dial("tcp", fmt.Sprintf("%s:22", ip.String()))
if conn != nil {
conn.Close()
}
if err == nil {
instanceReady <- payload
return
}
time.Sleep(time.Second)
}
}(payload.ID)
select {
case payload := <-instanceReady:
metrics.TimeSince("worker.vm.provider.jupiterbrain.boot", startBooting)
workerctx.LoggerFromContext(ctx).WithField("instance_uuid", payload.ID).Info("booted instance")
return &JupiterBrainInstance{
payload: payload,
provider: p,
}, nil
case err := <-errChan:
instance := &JupiterBrainInstance{
payload: payload,
provider: p,
}
instance.Stop(ctx)
return nil, err
case <-ctx.Done():
if ctx.Err() == context.DeadlineExceeded {
metrics.Mark("worker.vm.provider.jupiterbrain.boot.timeout")
}
instance := &JupiterBrainInstance{
payload: payload,
provider: p,
}
instance.Stop(ctx)
return nil, ctx.Err()
}
}
func (p *JupiterBrainProvider) 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)
}
return p.client.Do(req)
}
func (i *JupiterBrainInstance) UploadScript(ctx context.Context, script []byte) error {
client, err := i.sshClient()
if err != nil {
return err
}
defer client.Close()
sftp, err := sftp.NewClient(client)
if err != nil {
return err
}
defer sftp.Close()
_, err = sftp.Lstat("build.sh")
if err == nil {
return ErrStaleVM
}
f, err := sftp.Create("build.sh")
if err != nil {
return err
}
_, err = f.Write(script)
if err != nil {
return err
}
f, err = sftp.Create("wrapper.sh")
if err != nil {
return err
}
_, err = fmt.Fprintf(f, wrapperSh)
return err
}
func (i *JupiterBrainInstance) RunScript(ctx context.Context, output io.WriteCloser) (*RunResult, error) {
client, err := i.sshClient()
if err != nil {
return &RunResult{Completed: false}, err
}
defer client.Close()
session, err := client.NewSession()
if err != nil {
return &RunResult{Completed: false}, err
}
defer session.Close()
err = session.RequestPty("xterm", 80, 40, ssh.TerminalModes{})
if err != nil {
return &RunResult{Completed: false}, err
}
session.Stdout = output
session.Stderr = output
err = session.Run("bash ~/wrapper.sh")
defer output.Close()
if err == nil {
return &RunResult{Completed: true, ExitCode: 0}, nil
}
switch err := err.(type) {
case *ssh.ExitError:
return &RunResult{Completed: true, ExitCode: uint8(err.ExitStatus())}, nil
default:
return &RunResult{Completed: false}, err
}
}
func (i *JupiterBrainInstance) Stop(ctx context.Context) error {
u, err := i.provider.baseURL.Parse(fmt.Sprintf("instances/%s", url.QueryEscape(i.payload.ID)))
if err != nil {
return err
}
req, err := http.NewRequest("DELETE", u.String(), nil)
if err != nil {
return err
}
resp, err := i.provider.httpDo(req)
io.Copy(ioutil.Discard, resp.Body)
resp.Body.Close()
return err
}
func (i *JupiterBrainInstance) ID() string {
if i.payload == nil {
return "{unidentified}"
}
return fmt.Sprintf("%s:%s", i.payload.ID, i.payload.BaseImage)
}
func (i *JupiterBrainInstance) sshClient() (*ssh.Client, error) {
file, err := ioutil.ReadFile(i.provider.sshKeyPath)
if err != nil {
return nil, err
}
block, _ := pem.Decode(file)
if block == nil {
return nil, fmt.Errorf("ssh key does not contain a valid PEM block")
}
der, err := x509.DecryptPEMBlock(block, []byte(i.provider.sshKeyPassphrase))
if err != nil {
return nil, err
}
key, err := x509.ParsePKCS1PrivateKey(der)
if err != nil {
return nil, err
}
signer, err := ssh.NewSignerFromKey(key)
if err != nil {
return nil, err
}
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, fmt.Errorf("no valid IPv4 address")
}
return ssh.Dial("tcp", fmt.Sprintf("%s:22", ip.String()), &ssh.ClientConfig{
User: "travis",
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
})
}
func (p *JupiterBrainProvider) getImageName(startAttributes *StartAttributes) string {
for _, key := range []string{
startAttributes.OsxImage,
fmt.Sprintf("osx_image_%s", startAttributes.OsxImage),
fmt.Sprintf("osx_image_%s_%s", startAttributes.OsxImage, startAttributes.Language),
fmt.Sprintf("dist_%s_%s", startAttributes.Dist, startAttributes.Language),
fmt.Sprintf("dist_%s", startAttributes.Dist),
fmt.Sprintf("group_%s_%s", startAttributes.Group, startAttributes.Language),
fmt.Sprintf("group_%s", startAttributes.Group),
fmt.Sprintf("language_%s", startAttributes.Language),
fmt.Sprintf("default_%s", startAttributes.OS),
} {
imageName, ok := p.imageAliases[key]
if ok {
return imageName
}
}
return ""
}