storj/examples/eestream/serve/main.go
2019-07-31 17:38:44 +03:00

97 lines
2.2 KiB
Go

// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package main
import (
"context"
"crypto/sha256"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/vivint/infectious"
"go.uber.org/zap"
"storj.io/storj/pkg/encryption"
"storj.io/storj/pkg/ranger"
"storj.io/storj/pkg/storj"
"storj.io/storj/uplink/eestream"
)
var (
addr = flag.String("addr", "localhost:8080", "address to serve from")
erasureShareSize = flag.Int("erasure_share_size", 4*1024, "block size of pieces")
key = flag.String("key", "a key", "the secret key")
rsk = flag.Int("required", 20, "rs required")
rsn = flag.Int("total", 40, "rs total")
)
func main() {
flag.Parse()
if flag.Arg(0) == "" {
fmt.Printf("usage: %s <targetdir>\n", os.Args[0])
os.Exit(1)
}
err := Main()
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
}
// Main is the exported CLI executable function
func Main() error {
encKey := storj.Key(sha256.Sum256([]byte(*key)))
fc, err := infectious.NewFEC(*rsk, *rsn)
if err != nil {
return err
}
es := eestream.NewRSScheme(fc, *erasureShareSize)
var firstNonce storj.Nonce
decrypter, err := encryption.NewDecrypter(storj.EncAESGCM, &encKey, &firstNonce, es.StripeSize())
if err != nil {
return err
}
pieces, err := ioutil.ReadDir(flag.Arg(0))
if err != nil {
return err
}
rrs := map[int]ranger.Ranger{}
for _, piece := range pieces {
piecenum, err := strconv.Atoi(strings.TrimSuffix(piece.Name(), ".piece"))
if err != nil {
return err
}
r, err := ranger.FileRanger(filepath.Join(flag.Arg(0), piece.Name()))
if err != nil {
return err
}
rrs[piecenum] = r
}
rc, err := eestream.Decode(zap.L(), rrs, es, 4*1024*1024, false)
if err != nil {
return err
}
rr, err := encryption.Transform(rc, decrypter)
if err != nil {
return err
}
ctx := context.Background()
rr, err = eestream.UnpadSlow(ctx, rr)
if err != nil {
return err
}
return http.ListenAndServe(*addr, http.HandlerFunc(
func(w http.ResponseWriter, r *http.Request) {
ranger.ServeContent(ctx, w, r, flag.Arg(0), time.Time{}, rr)
}))
}