cmd/swarm, swarm/api/http, swarm/bmt, swarm/fuse, swarm/network/stream, swarm/storage, swarm/storage/encryption, swarm/testutil: use pseudo-random instead of crypto-random for test files content generation (#18083)

- Replace "crypto/rand" to "math/rand" for files content generation
- Remove swarm/network_test.go.Shuffle and swarm/btm/btm_test.go.Shuffle - because go1.9 support dropped (see https://github.com/ethereum/go-ethereum/pull/17807 and comments to swarm/network_test.go.Shuffle)

6 files changed, 29 insertions, 79 deletions

diff --git a/cmd/swarm/access_test.go b/cmd/swarm/access_test.go
index b4d2e1dbc..e812cd8fd 100644
--- a/cmd/swarm/access_test.go
+++ b/cmd/swarm/access_test.go
@@ -38,6 +38,7 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/swarm/api"
 	swarm "github.com/ethereum/go-ethereum/swarm/api/client"
+	swarmhttp "github.com/ethereum/go-ethereum/swarm/api/http"
 	"github.com/ethereum/go-ethereum/swarm/testutil"
 )
 
@@ -54,7 +55,7 @@ var DefaultCurve = crypto.S256()
 // is then fetched through 2nd node. since the tested code is not key-aware - we can just
 // fetch from the 2nd node using HTTP BasicAuth
 func TestAccessPassword(t *testing.T) {
-	srv := testutil.NewTestSwarmServer(t, serverFunc, nil)
+	srv := swarmhttp.NewTestSwarmServer(t, serverFunc, nil)
 	defer srv.Close()
 
 	dataFilename := testutil.TempFileWithContent(t, data)
diff --git a/cmd/swarm/export_test.go b/cmd/swarm/export_test.go
index c533511af..f1bc2f265 100644
--- a/cmd/swarm/export_test.go
+++ b/cmd/swarm/export_test.go
@@ -19,9 +19,7 @@ package main
 import (
 	"bytes"
 	"crypto/md5"
-	"crypto/rand"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"runtime"
@@ -29,6 +27,7 @@ import (
 	"testing"
 
 	"github.com/ethereum/go-ethereum/swarm"
+	"github.com/ethereum/go-ethereum/swarm/testutil"
 )
 
 // TestCLISwarmExportImport perform the following test:
@@ -45,11 +44,12 @@ func TestCLISwarmExportImport(t *testing.T) {
 	cluster := newTestCluster(t, 1)
 
 	// generate random 10mb file
-	f, cleanup := generateRandomFile(t, 10000000)
-	defer cleanup()
+	content := testutil.RandomBytes(1, 10000000)
+	fileName := testutil.TempFileWithContent(t, string(content))
+	defer os.Remove(fileName)
 
 	// upload the file with 'swarm up' and expect a hash
-	up := runSwarm(t, "--bzzapi", cluster.Nodes[0].URL, "up", f.Name())
+	up := runSwarm(t, "--bzzapi", cluster.Nodes[0].URL, "up", fileName)
 	_, matches := up.ExpectRegexp(`[a-f\d]{64}`)
 	up.ExpectExit()
 	hash := matches[0]
@@ -96,7 +96,7 @@ func TestCLISwarmExportImport(t *testing.T) {
 	}
 
 	// compare downloaded file with the generated random file
-	mustEqualFiles(t, f, res.Body)
+	mustEqualFiles(t, bytes.NewReader(content), res.Body)
 }
 
 func mustEqualFiles(t *testing.T, up io.Reader, down io.Reader) {
@@ -117,27 +117,3 @@ func mustEqualFiles(t *testing.T, up io.Reader, down io.Reader) {
 		t.Fatalf("downloaded imported file md5=%x (length %v) is not the same as the generated one mp5=%x (length %v)", downHash, downLen, upHash, upLen)
 	}
 }
-
-func generateRandomFile(t *testing.T, size int) (f *os.File, teardown func()) {
-	// create a tmp file
-	tmp, err := ioutil.TempFile("", "swarm-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// callback for tmp file cleanup
-	teardown = func() {
-		tmp.Close()
-		os.Remove(tmp.Name())
-	}
-
-	// write 10mb random data to file
-	buf := make([]byte, 10000000)
-	_, err = rand.Read(buf)
-	if err != nil {
-		t.Fatal(err)
-	}
-	ioutil.WriteFile(tmp.Name(), buf, 0755)
-
-	return tmp, teardown
-}
diff --git a/cmd/swarm/feeds_test.go b/cmd/swarm/feeds_test.go
index 46727c21d..fc3f72ab1 100644
--- a/cmd/swarm/feeds_test.go
+++ b/cmd/swarm/feeds_test.go
@@ -20,49 +20,37 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io"
 	"io/ioutil"
 	"os"
 	"testing"
 
-	"github.com/ethereum/go-ethereum/swarm/api"
-	"github.com/ethereum/go-ethereum/swarm/storage/feed/lookup"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
-
-	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/swarm/storage/feed"
-
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/swarm/api"
 	swarm "github.com/ethereum/go-ethereum/swarm/api/client"
 	swarmhttp "github.com/ethereum/go-ethereum/swarm/api/http"
+	"github.com/ethereum/go-ethereum/swarm/storage/feed"
+	"github.com/ethereum/go-ethereum/swarm/storage/feed/lookup"
+	"github.com/ethereum/go-ethereum/swarm/testutil"
 )
 
 func TestCLIFeedUpdate(t *testing.T) {
 
-	srv := testutil.NewTestSwarmServer(t, func(api *api.API) testutil.TestServer {
+	srv := swarmhttp.NewTestSwarmServer(t, func(api *api.API) swarmhttp.TestServer {
 		return swarmhttp.NewServer(api, "")
 	}, nil)
 	log.Info("starting a test swarm server")
 	defer srv.Close()
 
 	// create a private key file for signing
-	pkfile, err := ioutil.TempFile("", "swarm-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer pkfile.Close()
-	defer os.Remove(pkfile.Name())
 
 	privkeyHex := "0000000000000000000000000000000000000000000000000000000000001979"
 	privKey, _ := crypto.HexToECDSA(privkeyHex)
 	address := crypto.PubkeyToAddress(privKey.PublicKey)
 
-	// save the private key to a file
-	_, err = io.WriteString(pkfile, privkeyHex)
-	if err != nil {
-		t.Fatal(err)
-	}
+	pkFileName := testutil.TempFileWithContent(t, privkeyHex)
+	defer os.Remove(pkFileName)
 
 	// compose a topic. We'll be doing quotes about Miguel de Cervantes
 	var topic feed.Topic
@@ -76,7 +64,7 @@ func TestCLIFeedUpdate(t *testing.T) {
 
 	flags := []string{
 		"--bzzapi", srv.URL,
-		"--bzzaccount", pkfile.Name(),
+		"--bzzaccount", pkFileName,
 		"feed", "update",
 		"--topic", topic.Hex(),
 		"--name", name,
@@ -89,13 +77,10 @@ func TestCLIFeedUpdate(t *testing.T) {
 
 	// now try to get the update using the client
 	client := swarm.NewClient(srv.URL)
-	if err != nil {
-		t.Fatal(err)
-	}
 
 	// build the same topic as before, this time
 	// we use NewTopic to create a topic automatically.
-	topic, err = feed.NewTopic(name, subject)
+	topic, err := feed.NewTopic(name, subject)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -153,7 +138,7 @@ func TestCLIFeedUpdate(t *testing.T) {
 	// test publishing a manifest
 	flags = []string{
 		"--bzzapi", srv.URL,
-		"--bzzaccount", pkfile.Name(),
+		"--bzzaccount", pkFileName,
 		"feed", "create",
 		"--topic", topic.Hex(),
 	}
diff --git a/cmd/swarm/manifest_test.go b/cmd/swarm/manifest_test.go
index 7ea4e0c45..01d982aa7 100644
--- a/cmd/swarm/manifest_test.go
+++ b/cmd/swarm/manifest_test.go
@@ -26,7 +26,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/swarm/api"
 	swarm "github.com/ethereum/go-ethereum/swarm/api/client"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
+	swarmhttp "github.com/ethereum/go-ethereum/swarm/api/http"
 )
 
 // TestManifestChange tests manifest add, update and remove
@@ -58,7 +58,7 @@ func TestManifestChangeEncrypted(t *testing.T) {
 // Argument encrypt controls whether to use encryption or not.
 func testManifestChange(t *testing.T, encrypt bool) {
 	t.Parallel()
-	srv := testutil.NewTestSwarmServer(t, serverFunc, nil)
+	srv := swarmhttp.NewTestSwarmServer(t, serverFunc, nil)
 	defer srv.Close()
 
 	tmp, err := ioutil.TempDir("", "swarm-manifest-test")
@@ -430,7 +430,7 @@ func TestNestedDefaultEntryUpdateEncrypted(t *testing.T) {
 
 func testNestedDefaultEntryUpdate(t *testing.T, encrypt bool) {
 	t.Parallel()
-	srv := testutil.NewTestSwarmServer(t, serverFunc, nil)
+	srv := swarmhttp.NewTestSwarmServer(t, serverFunc, nil)
 	defer srv.Close()
 
 	tmp, err := ioutil.TempDir("", "swarm-manifest-test")
diff --git a/cmd/swarm/run_test.go b/cmd/swarm/run_test.go
index 55199e955..416fa7a50 100644
--- a/cmd/swarm/run_test.go
+++ b/cmd/swarm/run_test.go
@@ -42,7 +42,6 @@ import (
 	"github.com/ethereum/go-ethereum/swarm"
 	"github.com/ethereum/go-ethereum/swarm/api"
 	swarmhttp "github.com/ethereum/go-ethereum/swarm/api/http"
-	"github.com/ethereum/go-ethereum/swarm/testutil"
 )
 
 var loglevel = flag.Int("loglevel", 3, "verbosity of logs")
@@ -58,7 +57,7 @@ func init() {
 	})
 }
 
-func serverFunc(api *api.API) testutil.TestServer {
+func serverFunc(api *api.API) swarmhttp.TestServer {
 	return swarmhttp.NewServer(api, "")
 }
 func TestMain(m *testing.M) {
diff --git a/cmd/swarm/upload_test.go b/cmd/swarm/upload_test.go
index ba4463e8b..5f9844950 100644
--- a/cmd/swarm/upload_test.go
+++ b/cmd/swarm/upload_test.go
@@ -32,6 +32,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/log"
 	swarm "github.com/ethereum/go-ethereum/swarm/api/client"
+	swarmhttp "github.com/ethereum/go-ethereum/swarm/api/http"
 	"github.com/ethereum/go-ethereum/swarm/testutil"
 	"github.com/mattn/go-colorable"
 )
@@ -77,33 +78,22 @@ func testCLISwarmUp(toEncrypt bool, t *testing.T) {
 	cluster := newTestCluster(t, 3)
 	defer cluster.Shutdown()
 
-	// create a tmp file
-	tmp, err := ioutil.TempFile("", "swarm-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer tmp.Close()
-	defer os.Remove(tmp.Name())
+	tmpFileName := testutil.TempFileWithContent(t, data)
+	defer os.Remove(tmpFileName)
 
 	// write data to file
-	data := "notsorandomdata"
-	_, err = io.WriteString(tmp, data)
-	if err != nil {
-		t.Fatal(err)
-	}
-
 	hashRegexp := `[a-f\d]{64}`
 	flags := []string{
 		"--bzzapi", cluster.Nodes[0].URL,
 		"up",
-		tmp.Name()}
+		tmpFileName}
 	if toEncrypt {
 		hashRegexp = `[a-f\d]{128}`
 		flags = []string{
 			"--bzzapi", cluster.Nodes[0].URL,
 			"up",
 			"--encrypt",
-			tmp.Name()}
+			tmpFileName}
 	}
 	// upload the file with 'swarm up' and expect a hash
 	log.Info(fmt.Sprintf("uploading file with 'swarm up'"))
@@ -203,7 +193,6 @@ func testCLISwarmUpRecursive(toEncrypt bool, t *testing.T) {
 	}
 	defer os.RemoveAll(tmpUploadDir)
 	// create tmp files
-	data := "notsorandomdata"
 	for _, path := range []string{"tmp1", "tmp2"} {
 		if err := ioutil.WriteFile(filepath.Join(tmpUploadDir, path), bytes.NewBufferString(data).Bytes(), 0644); err != nil {
 			t.Fatal(err)
@@ -298,7 +287,7 @@ func TestCLISwarmUpDefaultPath(t *testing.T) {
 }
 
 func testCLISwarmUpDefaultPath(toEncrypt bool, absDefaultPath bool, t *testing.T) {
-	srv := testutil.NewTestSwarmServer(t, serverFunc, nil)
+	srv := swarmhttp.NewTestSwarmServer(t, serverFunc, nil)
 	defer srv.Close()
 
 	tmp, err := ioutil.TempDir("", "swarm-defaultpath-test")