[FABG-750] Make UserStore persistence optional

client.credentialStore.path is no longer required when
an SDK instance is created. When it's not provided, the SDK
will internally create an empty in-memory user store that
will be gone when the SDK instance is closed.

Change-Id: Iede63efd549c3e5519f9b98969e70c6fb9c946ed
Signed-off-by: Aleksandar Likic <aleksandar.likic@securekey.com>

pkg/fabsdk/factory/defmsp/mspfactory.go

@@ -31,14 +31,19 @@ func (f *ProviderFactory) CreateUserStore(config msp.IdentityConfig) (msp.UserSt
 
 	stateStorePath := config.Client().CredentialStore.Path
 
-	stateStore, err := kvs.New(&kvs.FileKeyValueStoreOptions{Path: stateStorePath})
-	if err != nil {
-		return nil, errors.WithMessage(err, "CreateNewFileKeyValueStore failed")
-	}
-
-	userStore, err := mspimpl.NewCertFileUserStore1(stateStore)
-	if err != nil {
-		return nil, errors.Wrapf(err, "creating a user store failed")
+	var userStore msp.UserStore
+
+	if stateStorePath == "" {
+		userStore = mspimpl.NewMemoryUserStore()
+	} else {
+		stateStore, err := kvs.New(&kvs.FileKeyValueStoreOptions{Path: stateStorePath})
+		if err != nil {
+			return nil, errors.WithMessage(err, "CreateNewFileKeyValueStore failed")
+		}
+		userStore, err = mspimpl.NewCertFileUserStore1(stateStore)
+		if err != nil {
+			return nil, errors.Wrapf(err, "creating a user store failed")
+		}
 	}
 
 	return userStore, nil

pkg/fabsdk/factory/defmsp/mspfactory_test.go

@@ -9,7 +9,7 @@ package defmsp
 import (
 	"testing"
 
-	"strings"
+	"reflect"
 
 	"github.com/golang/mock/gomock"
 	"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/msp"
@@ -20,6 +20,7 @@ import (
 	"github.com/hyperledger/fabric-sdk-go/pkg/fab/mocks"
 	"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk/factory/defcore"
 	mspimpl "github.com/hyperledger/fabric-sdk-go/pkg/msp"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestCreateUserStore(t *testing.T) {
@@ -79,8 +80,8 @@ func TestCreateUserStoreEmptyConfig(t *testing.T) {
 	mockConfig.EXPECT().Client().Return(&mockClientConfig)
 
 	_, err := factory.CreateUserStore(mockConfig)
-	if err == nil {
-		t.Fatal("Expected error creating user store")
+	if err != nil {
+		t.Fatal("Expected user store created")
 	}
 }
 
@@ -95,8 +96,8 @@ func TestCreateUserStoreFailConfig(t *testing.T) {
 	mockConfig.EXPECT().Client().Return(&mockClientConfig)
 
 	_, err := factory.CreateUserStore(mockConfig)
-	if err == nil || !strings.Contains(err.Error(), "FileKeyValueStore path is empty") {
-		t.Fatal("Expected error creating user store")
+	if err != nil {
+		t.Fatal("Expected user store created")
 	}
 }
 
@@ -150,3 +151,29 @@ func TestCreateIdentityManager(t *testing.T) {
 		t.Fatal("Unexpected signing manager created")
 	}
 }
+
+func TestCreateUserStoreWithoutCredentialStorePath(t *testing.T) {
+
+	configBackend, err := config.FromFile("../../../core/config/testdata/config_test_embedded_pems.yaml")()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	identityCfg, err := mspimpl.ConfigFromBackend(configBackend...)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	assert.Empty(t, identityCfg.CredentialStorePath())
+
+	factory := NewProviderFactory()
+	userStore, err := factory.CreateUserStore(identityCfg)
+	if err != nil {
+		t.Fatalf("Unexpected error creating user store %s", err)
+	}
+
+	_, err = userStore.Load(msp.IdentityIdentifier{MSPID: "abc", ID: "ef"})
+	assert.Equal(t, msp.ErrUserNotFound, err)
+
+	assert.Equal(t, reflect.TypeOf(mspimpl.NewMemoryUserStore()), reflect.TypeOf(userStore))
+}

test/integration/pkg/client/msp/identity_test.go

@@ -12,8 +12,10 @@ import (
 	"fmt"
 
 	"github.com/hyperledger/fabric-sdk-go/pkg/client/msp"
+	"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
 	"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
 	"github.com/hyperledger/fabric-sdk-go/test/integration"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestIdentity(t *testing.T) {
@@ -233,10 +235,33 @@ func containsIdentity(identities []*msp.IdentityResponse, request *msp.IdentityR
 	return false
 }
 
-func setupClient(t *testing.T) (*msp.Client, *fabsdk.FabricSDK) {
+type setupOptions struct {
+	configProvider core.ConfigProvider
+}
+
+type setupOption func(*setupOptions) error
+
+func withConfigProvider(configProvider core.ConfigProvider) setupOption {
+	return func(s *setupOptions) error {
+		s.configProvider = configProvider
+		return nil
+	}
+}
+
+func setupClient(t *testing.T, opts ...setupOption) (*msp.Client, *fabsdk.FabricSDK) {
+
+	o := setupOptions{
+		configProvider: integration.ConfigBackend,
+	}
+	for _, param := range opts {
+		err := param(&o)
+		if err != nil {
+			t.Fatalf("failed to create setup: %s", err)
+		}
+	}
 
 	// Instantiate the SDK
-	sdk, err := fabsdk.New(integration.ConfigBackend)
+	sdk, err := fabsdk.New(o.configProvider)
 	if err != nil {
 		t.Fatalf("SDK init failed: %s", err)
 	}
@@ -298,3 +323,37 @@ func containsAttribute(att msp.Attribute, attributes []msp.Attribute) bool {
 	}
 	return false
 }
+
+type emptyCredentialStorePathBackend struct {
+}
+
+func (c *emptyCredentialStorePathBackend) Lookup(key string) (interface{}, bool) {
+	if key == "client.credentialStore.path" {
+		return "", true
+	}
+	return nil, false
+}
+
+func TestCreateSDKWithoutCredentialStorePath(t *testing.T) {
+
+	integrationConfigProvider, err := integration.ConfigBackend()
+	assert.Nil(t, err)
+
+	emptyCredentialStorePathConfigProvider := func() ([]core.ConfigBackend, error) {
+		emptyCredentialStorePathBackendSlice := []core.ConfigBackend{
+			&emptyCredentialStorePathBackend{},
+		}
+		return append(emptyCredentialStorePathBackendSlice, integrationConfigProvider...), nil
+	}
+
+	client, sdk := setupClient(t, withConfigProvider(emptyCredentialStorePathConfigProvider))
+	defer integration.CleanupUserData(t, sdk)
+
+	ctxProvider := sdk.Context()
+	registrarEnrollID, _ := getRegistrarEnrollmentCredentials(t, ctxProvider)
+
+	// CA registrar should have been enrolled after the SDK was created
+	sid, err := client.GetSigningIdentity(registrarEnrollID)
+	assert.Nil(t, err)
+	assert.NotNil(t, sid)
+}