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// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"bytes"
"crypto/md5"
crand "crypto/rand"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"strings"
"sync"
"time"
"github.com/ethereum/go-ethereum/log"
"github.com/pborman/uuid"
cli "gopkg.in/urfave/cli.v1"
)
func generateEndpoints(scheme string, cluster string, from int, to int) {
if cluster == "prod" {
cluster = ""
} else if cluster == "local" {
for port := from; port <= to; port++ {
endpoints = append(endpoints, fmt.Sprintf("%s://localhost:%v", scheme, port))
}
return
} else {
cluster = cluster + "."
}
for port := from; port <= to; port++ {
endpoints = append(endpoints, fmt.Sprintf("%s://%v.%sswarm-gateways.net", scheme, port, cluster))
}
if includeLocalhost {
endpoints = append(endpoints, "http://localhost:8500")
}
}
func cliUploadAndSync(c *cli.Context) error {
defer func(now time.Time) { log.Info("total time", "time", time.Since(now), "size (kb)", filesize) }(time.Now())
generateEndpoints(scheme, cluster, from, to)
log.Info("uploading to " + endpoints[0] + " and syncing")
f, cleanup := generateRandomFile(filesize * 1000)
defer cleanup()
hash, err := upload(f, endpoints[0])
if err != nil {
log.Error(err.Error())
return err
}
fhash, err := digest(f)
if err != nil {
log.Error(err.Error())
return err
}
log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fhash))
time.Sleep(3 * time.Second)
wg := sync.WaitGroup{}
for _, endpoint := range endpoints {
ruid := uuid.New()[:8]
wg.Add(1)
go func(endpoint string, ruid string) {
for {
err := fetch(hash, endpoint, fhash, ruid)
if err != nil {
continue
}
wg.Done()
return
}
}(endpoint, ruid)
}
wg.Wait()
log.Info("all endpoints synced random file successfully")
return nil
}
// fetch is getting the requested `hash` from the `endpoint` and compares it with the `original` file
func fetch(hash string, endpoint string, original []byte, ruid string) error {
log.Trace("sleeping", "ruid", ruid)
time.Sleep(3 * time.Second)
log.Trace("http get request", "ruid", ruid, "api", endpoint, "hash", hash)
res, err := http.Get(endpoint + "/bzz:/" + hash + "/")
if err != nil {
log.Warn(err.Error(), "ruid", ruid)
return err
}
log.Trace("http get response", "ruid", ruid, "api", endpoint, "hash", hash, "code", res.StatusCode, "len", res.ContentLength)
if res.StatusCode != 200 {
err := fmt.Errorf("expected status code %d, got %v", 200, res.StatusCode)
log.Warn(err.Error(), "ruid", ruid)
return err
}
defer res.Body.Close()
rdigest, err := digest(res.Body)
if err != nil {
log.Warn(err.Error(), "ruid", ruid)
return err
}
if !bytes.Equal(rdigest, original) {
err := fmt.Errorf("downloaded imported file md5=%x is not the same as the generated one=%x", rdigest, original)
log.Warn(err.Error(), "ruid", ruid)
return err
}
log.Trace("downloaded file matches random file", "ruid", ruid, "len", res.ContentLength)
return nil
}
// upload is uploading a file `f` to `endpoint` via the `swarm up` cmd
func upload(f *os.File, endpoint string) (string, error) {
var out bytes.Buffer
cmd := exec.Command("swarm", "--bzzapi", endpoint, "up", f.Name())
cmd.Stdout = &out
err := cmd.Run()
if err != nil {
return "", err
}
hash := strings.TrimRight(out.String(), "\r\n")
return hash, nil
}
func digest(r io.Reader) ([]byte, error) {
h := md5.New()
_, err := io.Copy(h, r)
if err != nil {
return nil, err
}
return h.Sum(nil), nil
}
// generates random data in heap buffer
func generateRandomData(datasize int) ([]byte, error) {
b := make([]byte, datasize)
c, err := crand.Read(b)
if err != nil {
return nil, err
} else if c != datasize {
return nil, errors.New("short read")
}
return b, nil
}
// generateRandomFile is creating a temporary file with the requested byte size
func generateRandomFile(size int) (f *os.File, teardown func()) {
// create a tmp file
tmp, err := ioutil.TempFile("", "swarm-test")
if err != nil {
panic(err)
}
// callback for tmp file cleanup
teardown = func() {
tmp.Close()
os.Remove(tmp.Name())
}
buf := make([]byte, size)
_, err = crand.Read(buf)
if err != nil {
panic(err)
}
ioutil.WriteFile(tmp.Name(), buf, 0755)
return tmp, teardown
}
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