go/storage: Remove memory storage backend

go/storage/cachingclient/cachingclient_test.go

@@ -18,7 +18,7 @@ import (
 	"github.com/oasislabs/ekiden/go/common/crypto/hash"
 	memorySigner "github.com/oasislabs/ekiden/go/common/crypto/signature/signers/memory"
 	"github.com/oasislabs/ekiden/go/storage/api"
-	"github.com/oasislabs/ekiden/go/storage/memory"
+	"github.com/oasislabs/ekiden/go/storage/leveldb"
 	"github.com/oasislabs/ekiden/go/storage/mkvs/urkel"
 	"github.com/oasislabs/ekiden/go/storage/mkvs/urkel/node"
 	"github.com/oasislabs/ekiden/go/storage/tests"
@@ -31,11 +31,14 @@ const cacheSize = 10
 func TestCachingClient(t *testing.T) {
 	signer, err := memorySigner.NewSigner(rand.Reader)
 	require.NoError(t, err, "failed to generate dummy receipt signing key")
-	remote := memory.New(signer, false)
+	dbDir, err := ioutil.TempDir("", "cachingclient.test.leveldb")
+	require.NoError(t, err, "TempDir")
+	defer os.RemoveAll(dbDir)
+	remote, err := leveldb.New(dbDir, signer, 0, false)
+	require.NoError(t, err, "leveldb.New")
+
 	client, cacheDir := requireNewClient(t, remote)
-	defer func() {
-		os.RemoveAll(cacheDir)
-	}()
+	defer os.RemoveAll(cacheDir)
 
 	wl := makeTestWriteLog([]byte("TestSingle"), cacheSize)
 	expectedNewRoot := tests.CalculateExpectedNewRoot(t, wl, testNs, 1)
@@ -75,7 +78,11 @@ func TestCachingClient(t *testing.T) {
 
 	// Test the persistence.
 	client.Cleanup()
-	remote = memory.New(signer, false)
+	dbDir, err = ioutil.TempDir("", "cachingclient.test.leveldb")
+	require.NoError(t, err, "TempDir")
+	defer os.RemoveAll(dbDir)
+	remote, err = leveldb.New(dbDir, signer, 0, false)
+	require.NoError(t, err, "leveldb.New")
 	_, err = New(remote, false)
 	require.NoError(t, err, "New - reopen")
 

go/storage/crashing_test.go

@@ -2,6 +2,7 @@ package storage
 
 import (
 	"crypto/rand"
+	"io/ioutil"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -10,7 +11,7 @@ import (
 	"github.com/oasislabs/ekiden/go/common/crash"
 	"github.com/oasislabs/ekiden/go/common/crypto/hash"
 	memorySigner "github.com/oasislabs/ekiden/go/common/crypto/signature/signers/memory"
-	"github.com/oasislabs/ekiden/go/storage/memory"
+	"github.com/oasislabs/ekiden/go/storage/leveldb"
 	"github.com/oasislabs/ekiden/go/storage/tests"
 )
 
@@ -20,8 +21,12 @@ func TestCrashingBackendDoNotInterfere(t *testing.T) {
 	signer, err := memorySigner.NewSigner(rand.Reader)
 	require.NoError(t, err, "NewSigner()")
 
-	memoryBackend := memory.New(signer, false)
-	backend := newCrashingWrapper(memoryBackend)
+	dbDir, err := ioutil.TempDir("", "crashing.test.leveldb")
+	require.NoError(t, err, "TempDir")
+	defer os.RemoveAll(dbDir)
+	realBackend, err := leveldb.New(dbDir, signer, 0, false)
+	require.NoError(t, err, "leveldb.New")
+	backend := newCrashingWrapper(realBackend)
 
 	crash.Config(map[string]float64{
 		"storage.write.before": 0.0,

go/storage/init.go

@@ -20,7 +20,6 @@ import (
 	"github.com/oasislabs/ekiden/go/storage/cachingclient"
 	"github.com/oasislabs/ekiden/go/storage/client"
 	"github.com/oasislabs/ekiden/go/storage/leveldb"
-	"github.com/oasislabs/ekiden/go/storage/memory"
 )
 
 const (
@@ -56,8 +55,6 @@ func New(
 	insecureSkipChecks := viper.GetBool(cfgInsecureSkipChecks)
 
 	switch strings.ToLower(backend) {
-	case memory.BackendName:
-		impl = memory.New(signer, insecureSkipChecks)
 	case badger.BackendName:
 		dbDir := filepath.Join(dataDir, badger.DBFile)
 		impl, err = badger.New(dbDir, signer, applyLockLRUSlots, insecureSkipChecks)
@@ -93,7 +90,7 @@ func New(
 // command.
 func RegisterFlags(cmd *cobra.Command) {
 	if !cmd.Flags().Parsed() {
-		cmd.Flags().String(cfgBackend, memory.BackendName, "Storage backend")
+		cmd.Flags().String(cfgBackend, leveldb.BackendName, "Storage backend")
 		cmd.Flags().Bool(cfgDebugMockSigningKey, false, "Generate volatile mock signing key")
 		cmd.Flags().Bool(cfgCrashEnabled, false, "Enable the crashing storage wrapper")
 		cmd.Flags().Int(cfgLRUSlots, 1000, "How many LRU slots to use for Apply call locks in the MKVS tree root cache")