path: root/cmd/swarm/swarm-smoke/upload_and_sync.go

// 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
}