/
manifest.go
226 lines (201 loc) · 4.51 KB
/
manifest.go
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package stretcher
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"strings"
"time"
"github.com/dustin/go-humanize"
"github.com/fujiwara/shapeio"
"gopkg.in/yaml.v2"
)
var DefaultDestMode = os.FileMode(0755)
type Manifest struct {
Src string `yaml:"src"`
CheckSum string `yaml:"checksum"`
Dest string `yaml:"dest"`
DestMode *os.FileMode `yaml:"dest_mode"`
Commands Commands `yaml:"commands"`
Excludes []string `yaml:"excludes"`
ExcludeFrom string `yaml:"exclude_from"`
SyncStrategy string `yaml:"sync_strategy"`
}
func (m *Manifest) newHash() (hash.Hash, error) {
switch len(m.CheckSum) {
case 32:
return md5.New(), nil
case 40:
return sha1.New(), nil
case 64:
return sha256.New(), nil
case 128:
return sha512.New(), nil
default:
return nil, fmt.Errorf("checksum must be md5, sha1, sha256, sha512 hex string.")
}
}
func (m *Manifest) runCommands() error {
if err := m.Commands.Pre.Invoke(); err != nil {
return err
}
if err := m.Commands.Post.Invoke(); err != nil {
return err
}
return nil
}
func (m *Manifest) Deploy(conf Config) error {
if m.Src == "" {
return m.runCommands()
}
strategy, err := NewSyncStrategy(m)
if err != nil {
return err
}
tmp, err := ioutil.TempFile(os.TempDir(), "stretcher")
if err != nil {
return err
}
defer tmp.Close()
defer os.Remove(tmp.Name())
if conf.Timeout != 0 {
log.Printf("Set timeout %s", conf.Timeout)
timer := time.NewTimer(conf.Timeout)
done := make(chan error)
go func() {
done <- m.fetchSrc(conf, tmp)
}()
select {
case <-timer.C:
return fmt.Errorf("timeout %s reached while fetching src %s", conf.Timeout, m.Src)
case err := <-done:
if err != nil {
return err
}
}
} else {
err := m.fetchSrc(conf, tmp)
if err != nil {
return err
}
}
dir, err := ioutil.TempDir(os.TempDir(), "stretcher_src")
if err != nil {
return err
}
defer os.RemoveAll(dir)
err = m.Commands.Pre.Invoke()
if err != nil {
return err
}
cwd, err := os.Getwd()
if err != nil {
return err
}
if err = os.Chdir(dir); err != nil {
return err
}
log.Println("Extract archive:", tmp.Name(), "to", dir)
out, err := exec.Command("tar", "xf", tmp.Name()).CombinedOutput()
if len(out) > 0 {
log.Println(string(out))
}
if err != nil {
log.Println("failed: tar xf", tmp.Name(), "failed", err)
return err
}
log.Println("Set dest mode", *m.DestMode)
err = os.Chmod(dir, *m.DestMode)
if err != nil {
return err
}
from := dir + "/"
to := m.Dest
err = strategy.Sync(from, to)
if err != nil {
return err
}
if err = os.Chdir(cwd); err != nil {
return err
}
err = m.Commands.Post.Invoke()
if err != nil {
return err
}
return nil
}
func (m *Manifest) fetchSrc(conf Config, tmp *os.File) error {
begin := time.Now()
src, err := getURL(m.Src)
if err != nil {
for i := 0; i < conf.Retry; i++ {
log.Printf("Get src failed: %s", err)
log.Printf("Try again. Waiting: %s", conf.RetryWait)
time.Sleep(conf.RetryWait)
src, err = getURL(m.Src)
if err == nil {
break
}
}
if err != nil {
return fmt.Errorf("Get src failed: %s", err)
}
}
defer src.Close()
lsrc := shapeio.NewReader(src)
if conf.MaxBandWidth != 0 {
log.Printf("Set max bandwidth %s/sec", humanize.Bytes(uint64(conf.MaxBandWidth)))
lsrc.SetRateLimit(float64(conf.MaxBandWidth))
}
written, sum, err := m.copyAndCalcHash(tmp, lsrc)
if err != nil {
return err
}
elapsed := time.Since(begin)
log.Printf("Wrote %s bytes to %s (in %s, %s/s)",
humanize.Comma(written),
tmp.Name(),
elapsed,
humanize.Bytes(uint64(float64(written)/elapsed.Seconds())),
)
if len(m.CheckSum) > 0 && sum != strings.ToLower(m.CheckSum) {
return fmt.Errorf("Checksum mismatch. expected:%s got:%s", m.CheckSum, sum)
} else {
log.Printf("Checksum ok: %s", sum)
}
return nil
}
func (m *Manifest) copyAndCalcHash(dst io.Writer, src io.Reader) (int64, string, error) {
h, err := m.newHash()
if err != nil {
return 0, "", err
}
w := io.MultiWriter(h, dst)
written, err := io.Copy(w, src)
if err != nil {
return written, "", err
}
s := fmt.Sprintf("%x", h.Sum(nil))
return written, s, err
}
func ParseManifest(data []byte) (*Manifest, error) {
m := &Manifest{}
if err := yaml.Unmarshal(data, m); err != nil {
return nil, err
}
if m.Src != "" && m.Dest == "" {
return nil, fmt.Errorf("Dest is required")
}
if m.DestMode == nil {
mode := DefaultDestMode
m.DestMode = &mode
}
return m, nil
}