cmd/swarm/swarm-smoke: sliding window test (#18967)

cmd/swarm/swarm-smoke/feed_upload_and_sync.go

@@ -2,13 +2,11 @@ package main
 
 import (
 	"bytes"
-	"context"
 	"crypto/md5"
+	crand "crypto/rand"
 	"fmt"
 	"io"
 	"io/ioutil"
-	"net/http"
-	"net/http/httptrace"
 	"os"
 	"os/exec"
 	"strings"
@@ -18,13 +16,7 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
-	"github.com/ethereum/go-ethereum/metrics"
-	"github.com/ethereum/go-ethereum/swarm/api/client"
-	"github.com/ethereum/go-ethereum/swarm/spancontext"
 	"github.com/ethereum/go-ethereum/swarm/storage/feed"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
-	colorable "github.com/mattn/go-colorable"
-	opentracing "github.com/opentracing/opentracing-go"
 	"github.com/pborman/uuid"
 	cli "gopkg.in/urfave/cli.v1"
 )
@@ -33,27 +25,6 @@ const (
 	feedRandomDataLength = 8
 )
 
-func cliFeedUploadAndSync(c *cli.Context) error {
-	metrics.GetOrRegisterCounter("feed-and-sync", nil).Inc(1)
-	log.Root().SetHandler(log.CallerFileHandler(log.LvlFilterHandler(log.Lvl(verbosity), log.StreamHandler(colorable.NewColorableStderr(), log.TerminalFormat(true)))))
-
-	errc := make(chan error)
-	go func() {
-		errc <- feedUploadAndSync(c)
-	}()
-
-	select {
-	case err := <-errc:
-		if err != nil {
-			metrics.GetOrRegisterCounter("feed-and-sync.fail", nil).Inc(1)
-		}
-		return err
-	case <-time.After(time.Duration(timeout) * time.Second):
-		metrics.GetOrRegisterCounter("feed-and-sync.timeout", nil).Inc(1)
-		return fmt.Errorf("timeout after %v sec", timeout)
-	}
-}
-
 // TODO: retrieve with manifest + extract repeating code
 func feedUploadAndSync(c *cli.Context) error {
 	defer func(now time.Time) { log.Info("total time", "time", time.Since(now), "size (kb)", filesize) }(time.Now())
@@ -232,9 +203,10 @@ func feedUploadAndSync(c *cli.Context) error {
 	seed := int(time.Now().UnixNano() / 1e6)
 	log.Info("feed uploading to "+endpoints[0]+" and syncing", "seed", seed)
 
-	randomBytes := testutil.RandomBytes(seed, filesize*1000)
+	h = md5.New()
+	r := io.TeeReader(io.LimitReader(crand.Reader, int64(filesize*1000)), h)
 
-	hash, err := upload(&randomBytes, endpoints[0])
+	hash, err := upload(r, filesize*1000, endpoints[0])
 	if err != nil {
 		return err
 	}
@@ -243,10 +215,7 @@ func feedUploadAndSync(c *cli.Context) error {
 		return err
 	}
 	multihashHex := hexutil.Encode(hashBytes)
-	fileHash, err := digest(bytes.NewReader(randomBytes))
+	fileHash := h.Sum(nil)
-	if err != nil {
-		return err
-	}
 
 	log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fileHash))
 
@@ -307,60 +276,3 @@ func feedUploadAndSync(c *cli.Context) error {
 
 	return nil
 }
-
-func fetchFeed(topic string, user string, endpoint string, original []byte, ruid string) error {
-	ctx, sp := spancontext.StartSpan(context.Background(), "feed-and-sync.fetch")
-	defer sp.Finish()
-
-	log.Trace("sleeping", "ruid", ruid)
-	time.Sleep(3 * time.Second)
-
-	log.Trace("http get request (feed)", "ruid", ruid, "api", endpoint, "topic", topic, "user", user)
-
-	var tn time.Time
-	reqUri := endpoint + "/bzz-feed:/?topic=" + topic + "&user=" + user
-	req, _ := http.NewRequest("GET", reqUri, nil)
-
-	opentracing.GlobalTracer().Inject(
-		sp.Context(),
-		opentracing.HTTPHeaders,
-		opentracing.HTTPHeadersCarrier(req.Header))
-
-	trace := client.GetClientTrace("feed-and-sync - http get", "feed-and-sync", ruid, &tn)
-
-	req = req.WithContext(httptrace.WithClientTrace(ctx, trace))
-	transport := http.DefaultTransport
-
-	//transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-
-	tn = time.Now()
-	res, err := transport.RoundTrip(req)
-	if err != nil {
-		log.Error(err.Error(), "ruid", ruid)
-		return err
-	}
-
-	log.Trace("http get response (feed)", "ruid", ruid, "api", endpoint, "topic", topic, "user", user, "code", res.StatusCode, "len", res.ContentLength)
-
-	if res.StatusCode != 200 {
-		return fmt.Errorf("expected status code %d, got %v (ruid %v)", 200, res.StatusCode, ruid)
-	}
-
-	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
-}

cmd/swarm/swarm-smoke/main.go

@@ -140,19 +140,25 @@ func main() {
 			Name:    "upload_and_sync",
 			Aliases: []string{"c"},
 			Usage:   "upload and sync",
-			Action:  cliUploadAndSync,
+			Action:  wrapCliCommand("upload-and-sync", true, uploadAndSync),
 		},
 		{
 			Name:    "feed_sync",
 			Aliases: []string{"f"},
 			Usage:   "feed update generate, upload and sync",
-			Action:  cliFeedUploadAndSync,
+			Action:  wrapCliCommand("feed-and-sync", true, feedUploadAndSync),
 		},
 		{
 			Name:    "upload_speed",
 			Aliases: []string{"u"},
 			Usage:   "measure upload speed",
-			Action:  cliUploadSpeed,
+			Action:  wrapCliCommand("upload-speed", true, uploadSpeed),
+		},
+		{
+			Name:    "sliding_window",
+			Aliases: []string{"s"},
+			Usage:   "measure network aggregate capacity",
+			Action:  wrapCliCommand("sliding-window", false, slidingWindow),
 		},
 	}
 

cmd/swarm/swarm-smoke/sliding_window.go

@@ -0,0 +1,122 @@
+// 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 (
+	"crypto/md5"
+	crand "crypto/rand"
+	"fmt"
+	"io"
+	"math/rand"
+	"time"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/metrics"
+	"github.com/pborman/uuid"
+
+	cli "gopkg.in/urfave/cli.v1"
+)
+
+var seed = time.Now().UTC().UnixNano()
+
+func init() {
+	rand.Seed(seed)
+}
+
+type uploadResult struct {
+	hash   string
+	digest []byte
+}
+
+func slidingWindow(c *cli.Context) error {
+	defer func(now time.Time) {
+		totalTime := time.Since(now)
+
+		log.Info("total time", "time", totalTime)
+		metrics.GetOrRegisterCounter("sliding-window.total-time", nil).Inc(int64(totalTime))
+	}(time.Now())
+
+	generateEndpoints(scheme, cluster, appName, from, to)
+	hashes := []uploadResult{} //swarm hashes of the uploads
+	nodes := to - from
+	const iterationTimeout = 30 * time.Second
+	log.Info("sliding window test started", "nodes", nodes, "filesize(kb)", filesize, "timeout", timeout)
+	uploadedBytes := 0
+	networkDepth := 0
+	errored := false
+
+outer:
+	for {
+		log.Info("uploading to "+endpoints[0]+" and syncing", "seed", seed)
+
+		h := md5.New()
+		r := io.TeeReader(io.LimitReader(crand.Reader, int64(filesize*1000)), h)
+		t1 := time.Now()
+
+		hash, err := upload(r, filesize*1000, endpoints[0])
+		if err != nil {
+			log.Error(err.Error())
+			return err
+		}
+
+		metrics.GetOrRegisterResettingTimer("sliding-window.upload-time", nil).UpdateSince(t1)
+
+		fhash := h.Sum(nil)
+
+		log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fhash), "sleeping", syncDelay)
+		hashes = append(hashes, uploadResult{hash: hash, digest: fhash})
+		time.Sleep(time.Duration(syncDelay) * time.Second)
+		uploadedBytes += filesize * 1000
+
+		for i, v := range hashes {
+			timeout := time.After(time.Duration(timeout) * time.Second)
+			errored = false
+
+		inner:
+			for {
+				select {
+				case <-timeout:
+					errored = true
+					log.Error("error retrieving hash. timeout", "hash idx", i, "err", err)
+					metrics.GetOrRegisterCounter("sliding-window.single.error", nil).Inc(1)
+					break inner
+				default:
+					randIndex := 1 + rand.Intn(len(endpoints)-1)
+					ruid := uuid.New()[:8]
+					start := time.Now()
+					err := fetch(v.hash, endpoints[randIndex], v.digest, ruid)
+					if err != nil {
+						continue inner
+					}
+					metrics.GetOrRegisterResettingTimer("sliding-window.single.fetch-time", nil).UpdateSince(start)
+					break inner
+				}
+			}
+
+			if errored {
+				break outer
+			}
+			networkDepth = i
+			metrics.GetOrRegisterGauge("sliding-window.network-depth", nil).Update(int64(networkDepth))
+		}
+	}
+
+	log.Info("sliding window test finished", "errored?", errored, "networkDepth", networkDepth, "networkDepth(kb)", networkDepth*filesize)
+	log.Info("stats", "uploadedFiles", len(hashes), "uploadedKb", uploadedBytes/1000, "filesizeKb", filesize)
+
+	return nil
+}

cmd/swarm/swarm-smoke/upload_and_sync.go

@@ -17,76 +17,21 @@
 package main
 
 import (
-	"bytes"
-	"context"
 	"crypto/md5"
 	crand "crypto/rand"
-	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"math/rand"
-	"net/http"
-	"net/http/httptrace"
-	"os"
 	"sync"
 	"time"
 
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
-	"github.com/ethereum/go-ethereum/swarm/api"
-	"github.com/ethereum/go-ethereum/swarm/api/client"
-	"github.com/ethereum/go-ethereum/swarm/spancontext"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
-	opentracing "github.com/opentracing/opentracing-go"
 	"github.com/pborman/uuid"
 
 	cli "gopkg.in/urfave/cli.v1"
 )
 
-func generateEndpoints(scheme string, cluster string, app string, from int, to int) {
-	if cluster == "prod" {
-		for port := from; port < to; port++ {
-			endpoints = append(endpoints, fmt.Sprintf("%s://%v.swarm-gateways.net", scheme, port))
-		}
-	} else if cluster == "private-internal" {
-		for port := from; port < to; port++ {
-			endpoints = append(endpoints, fmt.Sprintf("%s://swarm-private-internal-%v:8500", scheme, port))
-		}
-	} else {
-		for port := from; port < to; port++ {
-			endpoints = append(endpoints, fmt.Sprintf("%s://%s-%v-%s.stg.swarm-gateways.net", scheme, app, port, cluster))
-		}
-	}
-
-	if includeLocalhost {
-		endpoints = append(endpoints, "http://localhost:8500")
-	}
-}
-
-func cliUploadAndSync(c *cli.Context) error {
-	log.PrintOrigins(true)
-	log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(verbosity), log.StreamHandler(os.Stdout, log.TerminalFormat(true))))
-
-	metrics.GetOrRegisterCounter("upload-and-sync", nil).Inc(1)
-
-	errc := make(chan error)
-	go func() {
-		errc <- uploadAndSync(c)
-	}()
-
-	select {
-	case err := <-errc:
-		if err != nil {
-			metrics.GetOrRegisterCounter("upload-and-sync.fail", nil).Inc(1)
-		}
-		return err
-	case <-time.After(time.Duration(timeout) * time.Second):
-		metrics.GetOrRegisterCounter("upload-and-sync.timeout", nil).Inc(1)
-		return fmt.Errorf("timeout after %v sec", timeout)
-	}
-}
-
 func uploadAndSync(c *cli.Context) error {
 	defer func(now time.Time) {
 		totalTime := time.Since(now)
@@ -96,23 +41,21 @@ func uploadAndSync(c *cli.Context) error {
 
 	generateEndpoints(scheme, cluster, appName, from, to)
 	seed := int(time.Now().UnixNano() / 1e6)
+
 	log.Info("uploading to "+endpoints[0]+" and syncing", "seed", seed)
 
-	randomBytes := testutil.RandomBytes(seed, filesize*1000)
+	h := md5.New()
+	r := io.TeeReader(io.LimitReader(crand.Reader, int64(filesize*1000)), h)
 
 	t1 := time.Now()
-	hash, err := upload(&randomBytes, endpoints[0])
+	hash, err := upload(r, filesize*1000, endpoints[0])
 	if err != nil {
 		log.Error(err.Error())
 		return err
 	}
 	metrics.GetOrRegisterResettingTimer("upload-and-sync.upload-time", nil).UpdateSince(t1)
 
-	fhash, err := digest(bytes.NewReader(randomBytes))
+	fhash := h.Sum(nil)
-	if err != nil {
-		log.Error(err.Error())
-		return err
-	}
 
 	log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fhash))
 
@@ -161,96 +104,3 @@ func uploadAndSync(c *cli.Context) error {
 
 	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 {
-	ctx, sp := spancontext.StartSpan(context.Background(), "upload-and-sync.fetch")
-	defer sp.Finish()
-
-	log.Trace("http get request", "ruid", ruid, "api", endpoint, "hash", hash)
-
-	var tn time.Time
-	reqUri := endpoint + "/bzz:/" + hash + "/"
-	req, _ := http.NewRequest("GET", reqUri, nil)
-
-	opentracing.GlobalTracer().Inject(
-		sp.Context(),
-		opentracing.HTTPHeaders,
-		opentracing.HTTPHeadersCarrier(req.Header))
-
-	trace := client.GetClientTrace("upload-and-sync - http get", "upload-and-sync", ruid, &tn)
-
-	req = req.WithContext(httptrace.WithClientTrace(ctx, trace))
-	transport := http.DefaultTransport
-
-	//transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
-
-	tn = time.Now()
-	res, err := transport.RoundTrip(req)
-	if err != nil {
-		log.Error(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(dataBytes *[]byte, endpoint string) (string, error) {
-	swarm := client.NewClient(endpoint)
-	f := &client.File{
-		ReadCloser: ioutil.NopCloser(bytes.NewReader(*dataBytes)),
-		ManifestEntry: api.ManifestEntry{
-			ContentType: "text/plain",
-			Mode:        0660,
-			Size:        int64(len(*dataBytes)),
-		},
-	}
-
-	// upload data to bzz:// and retrieve the content-addressed manifest hash, hex-encoded.
-	return swarm.Upload(f, "", false)
-}
-
-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
-}

cmd/swarm/swarm-smoke/upload_speed.go

@@ -17,54 +17,18 @@
 package main
 
 import (
-	"bytes"
+	"crypto/md5"
+	crand "crypto/rand"
 	"fmt"
-	"os"
+	"io"
 	"time"
 
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
 
 	cli "gopkg.in/urfave/cli.v1"
 )
 
-var endpoint string
-
-//just use the first endpoint
-func generateEndpoint(scheme string, cluster string, app string, from int) {
-	if cluster == "prod" {
-		endpoint = fmt.Sprintf("%s://%v.swarm-gateways.net", scheme, from)
-	} else if cluster == "private-internal" {
-		endpoint = fmt.Sprintf("%s://swarm-private-internal-%v:8500", scheme, from)
-	} else {
-		endpoint = fmt.Sprintf("%s://%s-%v-%s.stg.swarm-gateways.net", scheme, app, from, cluster)
-	}
-}
-
-func cliUploadSpeed(c *cli.Context) error {
-	log.PrintOrigins(true)
-	log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(verbosity), log.StreamHandler(os.Stdout, log.TerminalFormat(true))))
-
-	metrics.GetOrRegisterCounter("upload-speed", nil).Inc(1)
-
-	errc := make(chan error)
-	go func() {
-		errc <- uploadSpeed(c)
-	}()
-
-	select {
-	case err := <-errc:
-		if err != nil {
-			metrics.GetOrRegisterCounter("upload-speed.fail", nil).Inc(1)
-		}
-		return err
-	case <-time.After(time.Duration(timeout) * time.Second):
-		metrics.GetOrRegisterCounter("upload-speed.timeout", nil).Inc(1)
-		return fmt.Errorf("timeout after %v sec", timeout)
-	}
-}
-
 func uploadSpeed(c *cli.Context) error {
 	defer func(now time.Time) {
 		totalTime := time.Since(now)
@@ -73,25 +37,22 @@ func uploadSpeed(c *cli.Context) error {
 		metrics.GetOrRegisterCounter("upload-speed.total-time", nil).Inc(int64(totalTime))
 	}(time.Now())
 
-	generateEndpoint(scheme, cluster, appName, from)
+	endpoint := generateEndpoint(scheme, cluster, appName, from)
 	seed := int(time.Now().UnixNano() / 1e6)
 	log.Info("uploading to "+endpoint, "seed", seed)
 
-	randomBytes := testutil.RandomBytes(seed, filesize*1000)
+	h := md5.New()
+	r := io.TeeReader(io.LimitReader(crand.Reader, int64(filesize*1000)), h)
 
 	t1 := time.Now()
-	hash, err := upload(&randomBytes, endpoint)
+	hash, err := upload(r, filesize*1000, endpoint)
 	if err != nil {
 		log.Error(err.Error())
 		return err
 	}
 	metrics.GetOrRegisterCounter("upload-speed.upload-time", nil).Inc(int64(time.Since(t1)))
 
-	fhash, err := digest(bytes.NewReader(randomBytes))
+	fhash := h.Sum(nil)
-	if err != nil {
-		log.Error(err.Error())
-		return err
-	}
 
 	log.Info("uploaded successfully", "hash", hash, "digest", fmt.Sprintf("%x", fhash))
 	return nil

cmd/swarm/swarm-smoke/util.go

@@ -0,0 +1,267 @@
+// 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"
+	"context"
+	"crypto/md5"
+	crand "crypto/rand"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptrace"
+	"os"
+	"time"
+
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/metrics"
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"github.com/ethereum/go-ethereum/swarm/api/client"
+	"github.com/ethereum/go-ethereum/swarm/spancontext"
+	opentracing "github.com/opentracing/opentracing-go"
+	cli "gopkg.in/urfave/cli.v1"
+)
+
+var (
+	commandName = ""
+)
+
+func wrapCliCommand(name string, killOnTimeout bool, command func(*cli.Context) error) func(*cli.Context) error {
+	return func(ctx *cli.Context) error {
+		log.PrintOrigins(true)
+		log.Root().SetHandler(log.LvlFilterHandler(log.Lvl(verbosity), log.StreamHandler(os.Stdout, log.TerminalFormat(true))))
+		defer func(now time.Time) {
+			totalTime := time.Since(now)
+
+			log.Info("total time", "time", totalTime)
+			metrics.GetOrRegisterCounter(name+".total-time", nil).Inc(int64(totalTime))
+		}(time.Now())
+
+		log.Info("smoke test starting", "task", name, "timeout", timeout)
+		commandName = name
+		metrics.GetOrRegisterCounter(name, nil).Inc(1)
+
+		errc := make(chan error)
+		done := make(chan struct{})
+
+		if killOnTimeout {
+			go func() {
+				<-time.After(time.Duration(timeout) * time.Second)
+				close(done)
+			}()
+		}
+
+		go func() {
+			errc <- command(ctx)
+		}()
+
+		select {
+		case err := <-errc:
+			if err != nil {
+				metrics.GetOrRegisterCounter(fmt.Sprintf("%s.fail", name), nil).Inc(1)
+			}
+			return err
+		case <-done:
+			metrics.GetOrRegisterCounter(fmt.Sprintf("%s.timeout", name), nil).Inc(1)
+			return fmt.Errorf("timeout after %v sec", timeout)
+		}
+	}
+}
+
+func generateEndpoints(scheme string, cluster string, app string, from int, to int) {
+	if cluster == "prod" {
+		for port := from; port < to; port++ {
+			endpoints = append(endpoints, fmt.Sprintf("%s://%v.swarm-gateways.net", scheme, port))
+		}
+	} else if cluster == "private-internal" {
+		for port := from; port < to; port++ {
+			endpoints = append(endpoints, fmt.Sprintf("%s://swarm-private-internal-%v:8500", scheme, port))
+		}
+	} else {
+		for port := from; port < to; port++ {
+			endpoints = append(endpoints, fmt.Sprintf("%s://%s-%v-%s.stg.swarm-gateways.net", scheme, app, port, cluster))
+		}
+	}
+
+	if includeLocalhost {
+		endpoints = append(endpoints, "http://localhost:8500")
+	}
+}
+
+//just use the first endpoint
+func generateEndpoint(scheme string, cluster string, app string, from int) string {
+	if cluster == "prod" {
+		return fmt.Sprintf("%s://%v.swarm-gateways.net", scheme, from)
+	} else if cluster == "private-internal" {
+		return fmt.Sprintf("%s://swarm-private-internal-%v:8500", scheme, from)
+	} else {
+		return fmt.Sprintf("%s://%s-%v-%s.stg.swarm-gateways.net", scheme, app, from, cluster)
+	}
+}
+
+func fetchFeed(topic string, user string, endpoint string, original []byte, ruid string) error {
+	ctx, sp := spancontext.StartSpan(context.Background(), "feed-and-sync.fetch")
+	defer sp.Finish()
+
+	log.Trace("sleeping", "ruid", ruid)
+	time.Sleep(3 * time.Second)
+
+	log.Trace("http get request (feed)", "ruid", ruid, "api", endpoint, "topic", topic, "user", user)
+
+	var tn time.Time
+	reqUri := endpoint + "/bzz-feed:/?topic=" + topic + "&user=" + user
+	req, _ := http.NewRequest("GET", reqUri, nil)
+
+	opentracing.GlobalTracer().Inject(
+		sp.Context(),
+		opentracing.HTTPHeaders,
+		opentracing.HTTPHeadersCarrier(req.Header))
+
+	trace := client.GetClientTrace("feed-and-sync - http get", "feed-and-sync", ruid, &tn)
+
+	req = req.WithContext(httptrace.WithClientTrace(ctx, trace))
+	transport := http.DefaultTransport
+
+	//transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
+
+	tn = time.Now()
+	res, err := transport.RoundTrip(req)
+	if err != nil {
+		log.Error(err.Error(), "ruid", ruid)
+		return err
+	}
+
+	log.Trace("http get response (feed)", "ruid", ruid, "api", endpoint, "topic", topic, "user", user, "code", res.StatusCode, "len", res.ContentLength)
+
+	if res.StatusCode != 200 {
+		return fmt.Errorf("expected status code %d, got %v (ruid %v)", 200, res.StatusCode, ruid)
+	}
+
+	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
+}
+
+// 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 {
+	ctx, sp := spancontext.StartSpan(context.Background(), "upload-and-sync.fetch")
+	defer sp.Finish()
+
+	log.Trace("http get request", "ruid", ruid, "api", endpoint, "hash", hash)
+
+	var tn time.Time
+	reqUri := endpoint + "/bzz:/" + hash + "/"
+	req, _ := http.NewRequest("GET", reqUri, nil)
+
+	opentracing.GlobalTracer().Inject(
+		sp.Context(),
+		opentracing.HTTPHeaders,
+		opentracing.HTTPHeadersCarrier(req.Header))
+
+	trace := client.GetClientTrace(commandName+" - http get", commandName, ruid, &tn)
+
+	req = req.WithContext(httptrace.WithClientTrace(ctx, trace))
+	transport := http.DefaultTransport
+
+	//transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
+
+	tn = time.Now()
+	res, err := transport.RoundTrip(req)
+	if err != nil {
+		log.Error(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 an arbitrary byte as a plaintext file  to `endpoint` using the api client
+func upload(r io.Reader, size int, endpoint string) (string, error) {
+	swarm := client.NewClient(endpoint)
+	f := &client.File{
+		ReadCloser: ioutil.NopCloser(r),
+		ManifestEntry: api.ManifestEntry{
+			ContentType: "text/plain",
+			Mode:        0660,
+			Size:        int64(size),
+		},
+	}
+
+	// upload data to bzz:// and retrieve the content-addressed manifest hash, hex-encoded.
+	return swarm.Upload(f, "", false)
+}
+
+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
+}