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)

swarm/api/http/test_server.go

@@ -0,0 +1,97 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package http
+
+import (
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+	"github.com/ethereum/go-ethereum/swarm/storage/feed"
+)
+
+type TestServer interface {
+	ServeHTTP(http.ResponseWriter, *http.Request)
+}
+
+func NewTestSwarmServer(t *testing.T, serverFunc func(*api.API) TestServer, resolver api.Resolver) *TestSwarmServer {
+	dir, err := ioutil.TempDir("", "swarm-storage-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	storeparams := storage.NewDefaultLocalStoreParams()
+	storeparams.DbCapacity = 5000000
+	storeparams.CacheCapacity = 5000
+	storeparams.Init(dir)
+	localStore, err := storage.NewLocalStore(storeparams, nil)
+	if err != nil {
+		os.RemoveAll(dir)
+		t.Fatal(err)
+	}
+	fileStore := storage.NewFileStore(localStore, storage.NewFileStoreParams())
+
+	// Swarm feeds test setup
+	feedsDir, err := ioutil.TempDir("", "swarm-feeds-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	rhparams := &feed.HandlerParams{}
+	rh, err := feed.NewTestHandler(feedsDir, rhparams)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	a := api.NewAPI(fileStore, resolver, rh.Handler, nil)
+	srv := httptest.NewServer(serverFunc(a))
+	tss := &TestSwarmServer{
+		Server:    srv,
+		FileStore: fileStore,
+		dir:       dir,
+		Hasher:    storage.MakeHashFunc(storage.DefaultHash)(),
+		cleanup: func() {
+			srv.Close()
+			rh.Close()
+			os.RemoveAll(dir)
+			os.RemoveAll(feedsDir)
+		},
+		CurrentTime: 42,
+	}
+	feed.TimestampProvider = tss
+	return tss
+}
+
+type TestSwarmServer struct {
+	*httptest.Server
+	Hasher      storage.SwarmHash
+	FileStore   *storage.FileStore
+	dir         string
+	cleanup     func()
+	CurrentTime uint64
+}
+
+func (t *TestSwarmServer) Close() {
+	t.cleanup()
+}
+
+func (t *TestSwarmServer) Now() feed.Timestamp {
+	return feed.Timestamp{Time: t.CurrentTime}
+}