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s3upload.go
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s3upload.go
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package main
import (
"bytes"
"flag"
"io/ioutil"
"log"
"mime"
"os"
"os/user"
"path"
"path/filepath"
"strings"
"sync"
"launchpad.net/goamz/aws"
"launchpad.net/goamz/s3"
)
var (
nConn = flag.Int("n", 3, "maximum number of connections")
)
type Upload struct {
fi os.FileInfo
local, remote string
}
func ParseURL(url string) (bucket string, path string) {
if len(url) < 6 || url[0:5] != "s3://" {
return "", ""
}
s := strings.SplitN(url[5:], "/", 2)
return s[0], s[1]
}
func ReadConfig() (accesskey string, secret string, err error) {
homedir := os.Getenv("HOME")
if homedir == "" {
u, err := user.Current()
if err != nil { return "", "", err }
homedir = u.HomeDir
}
cfg, err := ioutil.ReadFile(homedir + "/.s3cfg")
if err != nil { return }
for off := 0; off != -1; off = bytes.IndexRune(cfg, '\n') {
line := cfg[:off]
cfg = cfg[off+1:]
tokens := bytes.SplitN(line, []byte(" = "), 2)
if len(tokens) != 2 {
continue
}
switch string(tokens[0]) {
case "access_key":
accesskey = string(tokens[1])
case "secret_key":
secret = string(tokens[1])
}
}
return
}
func main() {
flag.Parse()
var err error
var auth aws.Auth
auth.AccessKey, auth.SecretKey, err = ReadConfig()
if err != nil {
log.Fatalf("Reading config file: %s", err.Error())
}
args := flag.Args()
if len(args) < 2 {
flag.Usage()
return
}
na := len(args)
target := args[na-1]
args = args[:na-1]
bucketname, bpath := ParseURL(target)
if bucketname == "" {
log.Fatalf("invalid target URL: %s", target)
}
conn := s3.New(auth, aws.EUWest)
bucket := conn.Bucket(bucketname)
// Start nConn upload routines
var wg sync.WaitGroup
wg.Add(*nConn)
c := make(chan *Upload, *nConn)
for i := 0; i < *nConn; i++ {
go func() {
for u := range c {
f, err := os.Open(u.local)
if err != nil {
log.Print(err)
continue
}
mimetype := mime.TypeByExtension(filepath.Ext(u.local))
if mimetype == "" {
mimetype = "application/octet-stream"
}
log.Print(u.remote)
err = bucket.PutReader(u.remote, f, u.fi.Size(), mimetype, s3.PublicRead)
if err == nil {
f.Close()
continue
}
// Infinite retries ...
for i := 1; err != nil; i++ {
log.Printf("Error uploading %s: %s", u.remote, err.Error())
f.Seek(0, 0)
log.Printf("%s (retry %d)", u.remote, i)
err = bucket.PutReader(u.remote, f, u.fi.Size(), mimetype, s3.PublicRead)
}
f.Close()
}
wg.Done()
}()
}
// Feed file names.
for _, a := range args {
u := &Upload{local: a}
var err error
u.fi, err = os.Stat(a)
if err != nil {
log.Printf("skipping %s: %s", a, err.Error())
continue
}
if u.fi.IsDir() {
basepath := filepath.Dir(a)
err = filepath.Walk(a, func(p string, fi os.FileInfo, err error) error {
if err == nil && !fi.IsDir() {
u2 := &Upload{local: p, fi: fi}
rel, err := filepath.Rel(basepath, p)
if err != nil {
return err
}
u2.remote = path.Join(bpath, filepath.ToSlash(rel))
c <- u2
}
return nil
})
if err != nil {
log.Print(err)
}
} else {
u.remote = path.Clean(path.Join(bpath, u.fi.Name()))
c <- u
}
}
close(c)
wg.Wait()
}