This commit consists of the following:
1) The kafka messaging proxy in Twisted python for adapters
2) Initial implementation and containerization of ponsim OLT adapter
and ponsim ONU adapter
3) Initial submission of request and response facade in both Twisted
python and Go Language
4) Initial implementation of device management and logical device management
in the Core
5) Update to the log module to allow dynamic setting of log level per
package using the gRPC API
6) Bug fixes and minor changes

Change-Id: Ia8f033da84cfd08275335bae9542802415e7bb0f
diff --git a/rw_core/core/grpc_nbi_api_handler_client_test.go b/rw_core/core/grpc_nbi_api_handler_client_test.go
new file mode 100644
index 0000000..721271e
--- /dev/null
+++ b/rw_core/core/grpc_nbi_api_handler_client_test.go
@@ -0,0 +1,272 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package core
+
+import (
+	"context"
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/opencord/voltha-go/common/log"
+	"github.com/opencord/voltha-go/protos/common"
+	"github.com/opencord/voltha-go/protos/openflow_13"
+	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+	"os"
+	"testing"
+)
+
+var conn *grpc.ClientConn
+var stub voltha.VolthaServiceClient
+var testMode string
+
+/*
+NOTE:  These tests require the rw_core to run prior to executing these test cases
+*/
+
+func setup() {
+	var err error
+
+	if err = log.AddPackage(log.JSON, log.WarnLevel, log.Fields{"instanceId": "testing"}); err != nil {
+		log.With(log.Fields{"error": err}).Fatal("Cannot setup logging")
+	}
+	conn, err = grpc.Dial("localhost:50057", grpc.WithInsecure())
+	if err != nil {
+		log.Fatalf("did not connect: %s", err)
+	}
+
+	stub = voltha.NewVolthaServiceClient(conn)
+	testMode = common.TestModeKeys_api_test.String()
+}
+
+func TestGetDevice(t *testing.T) {
+	var id common.ID
+	id.Id = "anyid"
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.GetDevice(ctx, &id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, id.Id, st.Message())
+	assert.Equal(t, codes.NotFound, st.Code())
+}
+
+func TestUpdateLogLevelError(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	level := voltha.Logging{PackageName: "github.com/opencord/voltha-go/rw_core/core", Level: common.LogLevel_ERROR}
+	response, err := stub.UpdateLogLevel(ctx, &level)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestGetVoltha(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.GetVoltha(ctx, &empty.Empty{})
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestUpdateLogLevelDebug(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	level := voltha.Logging{PackageName: "github.com/opencord/voltha-go/rw_core/core", Level: common.LogLevel_DEBUG}
+	response, err := stub.UpdateLogLevel(ctx, &level)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestGetCoreInstance(t *testing.T) {
+	id := &voltha.ID{Id: "getCoreInstance"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.GetCoreInstance(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestGetLogicalDevice(t *testing.T) {
+	id := &voltha.ID{Id: "getLogicalDevice"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.GetLogicalDevice(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, id.Id, st.Message())
+	assert.Equal(t, codes.NotFound, st.Code())
+}
+
+func TestGetLogicalDevicePort(t *testing.T) {
+	id := &voltha.LogicalPortId{Id: "GetLogicalDevicePort"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.GetLogicalDevicePort(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestListLogicalDevicePorts(t *testing.T) {
+	id := &voltha.ID{Id: "listLogicalDevicePorts"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.ListLogicalDevicePorts(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestListLogicalDeviceFlows(t *testing.T) {
+	id := &voltha.ID{Id: "ListLogicalDeviceFlows"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.ListLogicalDeviceFlows(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestListLogicalDeviceFlowGroups(t *testing.T) {
+	id := &voltha.ID{Id: "ListLogicalDeviceFlowGroups"}
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.ListLogicalDeviceFlowGroups(ctx, id)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestListDevices(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, _ := stub.ListDevices(ctx, &empty.Empty{})
+	assert.Equal(t, len(response.Items), 0)
+}
+
+func TestListAdapters(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.ListAdapters(ctx, &empty.Empty{})
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestListLogicalDevices(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, _ := stub.ListLogicalDevices(ctx, &empty.Empty{})
+	assert.Equal(t, len(response.Items), 0)
+}
+
+func TestListCoreInstances(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	response, err := stub.ListCoreInstances(ctx, &empty.Empty{})
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+func TestCreateDevice(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	device := &voltha.Device{Id: "newdevice"}
+	response, err := stub.CreateDevice(ctx, device)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &voltha.Device{Id: "newdevice"}, response)
+	assert.Nil(t, err)
+}
+
+func TestEnableDevice(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.ID{Id: "enabledevice"}
+	response, err := stub.EnableDevice(ctx, id)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestDisableDevice(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.ID{Id: "DisableDevice"}
+	response, err := stub.DisableDevice(ctx, id)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestRebootDevice(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.ID{Id: "RebootDevice"}
+	response, err := stub.RebootDevice(ctx, id)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestDeleteDevice(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.ID{Id: "DeleteDevice"}
+	response, err := stub.DeleteDevice(ctx, id)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestEnableLogicalDevicePort(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.LogicalPortId{Id: "EnableLogicalDevicePort"}
+	response, err := stub.EnableLogicalDevicePort(ctx, id)
+	if e, ok := status.FromError(err); ok {
+		log.Infow("response", log.Fields{"error": err, "errorcode": e.Code(), "msg": e.Message()})
+	}
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestDisableLogicalDevicePort(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	id := &voltha.LogicalPortId{Id: "DisableLogicalDevicePort"}
+	response, err := stub.DisableLogicalDevicePort(ctx, id)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestUpdateLogicalDeviceFlowGroupTable(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	flow := &openflow_13.FlowGroupTableUpdate{Id: "UpdateLogicalDeviceFlowGroupTable"}
+	response, err := stub.UpdateLogicalDeviceFlowGroupTable(ctx, flow)
+	log.Infow("response", log.Fields{"res": response, "error": err})
+	assert.Equal(t, &empty.Empty{}, response)
+	assert.Nil(t, err)
+}
+
+func TestGetImageDownloadStatus(t *testing.T) {
+	ctx := metadata.NewOutgoingContext(context.Background(), metadata.Pairs(testMode, "true"))
+	img := &voltha.ImageDownload{Id: "GetImageDownloadStatus"}
+	response, err := stub.GetImageDownloadStatus(ctx, img)
+	assert.Nil(t, response)
+	st, _ := status.FromError(err)
+	assert.Equal(t, "UnImplemented", st.Message())
+}
+
+// TODO: complete the remaining tests
+
+func shutdown() {
+	conn.Close()
+}
+
+func TestMain(m *testing.M) {
+	setup()
+	code := m.Run()
+	shutdown()
+	os.Exit(code)
+}