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main.go
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main.go
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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
package main
import (
"context"
"crypto/sha256"
"flag"
"fmt"
"net/http"
"os"
"time"
"github.com/vivint/infectious"
"storj.io/storj/pkg/eestream"
"storj.io/storj/pkg/encryption"
"storj.io/storj/pkg/ranger"
"storj.io/storj/pkg/storj"
)
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() {
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 {
ctx := context.Background()
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
}
// initialize http rangers in parallel to save from network latency
rrs := map[int]ranger.Ranger{}
type indexRangerError struct {
i int
rr ranger.Ranger
err error
}
result := make(chan indexRangerError, *rsn)
for i := 0; i < *rsn; i++ {
go func(i int) {
url := fmt.Sprintf("http://18.184.133.99:%d", 10000+i)
rr, err := ranger.HTTPRanger(ctx, url)
result <- indexRangerError{i: i, rr: rr, err: err}
}(i)
}
// wait for all goroutines to finish and save result in rrs map
for i := 0; i < *rsn; i++ {
res := <-result
if res.err != nil {
// return on the first failure
return err
}
rrs[res.i] = res.rr
}
rc, err := eestream.Decode(rrs, es, 4*1024*1024, false)
if err != nil {
return err
}
rr, err := encryption.Transform(rc, decrypter)
if err != nil {
return err
}
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)
}))
}