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/logical_device_manager.go b/rw_core/core/logical_device_manager.go
new file mode 100644
index 0000000..61f96e8
--- /dev/null
+++ b/rw_core/core/logical_device_manager.go
@@ -0,0 +1,146 @@
+/*
+ * 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"
+	"errors"
+	"github.com/opencord/voltha-go/common/log"
+	"github.com/opencord/voltha-go/db/model"
+	"github.com/opencord/voltha-go/kafka"
+	"github.com/opencord/voltha-go/protos/voltha"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"reflect"
+	"strings"
+	"sync"
+)
+
+type LogicalDeviceManager struct {
+	logicalDeviceAgents        map[string]*LogicalDeviceAgent
+	deviceMgr                  *DeviceManager
+	adapterProxy               *AdapterProxy
+	kafkaProxy                 *kafka.KafkaMessagingProxy
+	localDataProxy             *model.Proxy
+	exitChannel                chan int
+	lockLogicalDeviceAgentsMap sync.RWMutex
+}
+
+func NewLogicalDeviceManager(deviceMgr *DeviceManager, kafkaProxy *kafka.KafkaMessagingProxy, ldProxy *model.Proxy) *LogicalDeviceManager {
+	var logicalDeviceMgr LogicalDeviceManager
+	logicalDeviceMgr.exitChannel = make(chan int, 1)
+	logicalDeviceMgr.logicalDeviceAgents = make(map[string]*LogicalDeviceAgent)
+	logicalDeviceMgr.deviceMgr = deviceMgr
+	logicalDeviceMgr.kafkaProxy = kafkaProxy
+	logicalDeviceMgr.localDataProxy = ldProxy
+	logicalDeviceMgr.lockLogicalDeviceAgentsMap = sync.RWMutex{}
+	return &logicalDeviceMgr
+}
+
+func (ldMgr *LogicalDeviceManager) Start(ctx context.Context) {
+	log.Info("starting-logical-device-manager")
+	log.Info("logical-device-manager-started")
+}
+
+func (ldMgr *LogicalDeviceManager) Stop(ctx context.Context) {
+	log.Info("stopping-logical-device-manager")
+	ldMgr.exitChannel <- 1
+	log.Info("logical-device-manager-stopped")
+}
+
+func (ldMgr *LogicalDeviceManager) addLogicalDeviceAgentToMap(agent *LogicalDeviceAgent) {
+	ldMgr.lockLogicalDeviceAgentsMap.Lock()
+	defer ldMgr.lockLogicalDeviceAgentsMap.Unlock()
+	if _, exist := ldMgr.logicalDeviceAgents[agent.logicalDeviceId]; !exist {
+		ldMgr.logicalDeviceAgents[agent.logicalDeviceId] = agent
+	}
+}
+
+func (ldMgr *LogicalDeviceManager) getLogicalDeviceAgent(logicalDeviceId string) *LogicalDeviceAgent {
+	ldMgr.lockLogicalDeviceAgentsMap.Lock()
+	defer ldMgr.lockLogicalDeviceAgentsMap.Unlock()
+	if agent, ok := ldMgr.logicalDeviceAgents[logicalDeviceId]; ok {
+		return agent
+	}
+	return nil
+}
+
+func (ldMgr *LogicalDeviceManager) getLogicalDevice(id string) (*voltha.LogicalDevice, error) {
+	log.Debugw("getlogicalDevice-start", log.Fields{"logicaldeviceid": id})
+	logicalDevice := ldMgr.localDataProxy.Get("/logical_devices/"+id, 1, false, "")
+	if logicalDevice != nil {
+		cloned := reflect.ValueOf(logicalDevice).Elem().Interface().(voltha.LogicalDevice)
+		return &cloned, nil
+	}
+	return nil, status.Errorf(codes.NotFound, "%s", id)
+}
+
+func (ldMgr *LogicalDeviceManager) listLogicalDevices() (*voltha.LogicalDevices, error) {
+	log.Debug("listLogicalDevices-start")
+	result := &voltha.LogicalDevices{}
+	ldMgr.lockLogicalDeviceAgentsMap.Lock()
+	defer ldMgr.lockLogicalDeviceAgentsMap.Unlock()
+	for _, agent := range ldMgr.logicalDeviceAgents {
+		logicalDevice := ldMgr.localDataProxy.Get("/logical_devices/"+agent.logicalDeviceId, 1, false, "")
+		if logicalDevice != nil {
+			cloned := reflect.ValueOf(logicalDevice).Elem().Interface().(voltha.LogicalDevice)
+			result.Items = append(result.Items, &cloned)
+		}
+	}
+	return result, nil
+}
+
+func (ldMgr *LogicalDeviceManager) CreateLogicalDevice(ctx context.Context, device *voltha.Device) (*string, error) {
+	log.Infow("creating-logical-device-start", log.Fields{"deviceId": device.Id})
+	// Sanity check
+	if !device.Root {
+		return nil, errors.New("Device-not-root")
+	}
+
+	// Create a logical device agent - the logical device Id is based on the mac address of the device
+	// For now use the serial number - it may contain any combination of alphabetic characters and numbers,
+	// with length varying from eight characters to a maximum of 14 characters.   Mac Address is part of oneof
+	// in the Device model.  May need to be moved out.
+	macAddress := device.MacAddress
+	id := strings.Replace(macAddress, ":", "", -1)
+	log.Debugw("setting-logical-device-id", log.Fields{"logicaldeviceId": id})
+
+	agent := NewLogicalDeviceAgent(id, device, ldMgr, ldMgr.deviceMgr, ldMgr.localDataProxy)
+	ldMgr.addLogicalDeviceAgentToMap(agent)
+	go agent.Start(ctx)
+
+	log.Info("creating-logical-device-ends")
+	return &id, nil
+}
+
+func (ldMgr *LogicalDeviceManager) AddUNILogicalPort(ctx context.Context, childDevice *voltha.Device) error {
+	log.Infow("AddUNILogicalPort-start", log.Fields{"deviceId": childDevice.Id})
+	// Sanity check
+	if childDevice.Root {
+		return errors.New("Device-root")
+	}
+
+	// Get the logical device id parent device
+	parentId := childDevice.ParentId
+	logDeviceId := ldMgr.deviceMgr.GetParentDeviceId(parentId)
+
+	log.Infow("AddUNILogicalPort", log.Fields{"logDeviceId": logDeviceId, "parentId": parentId})
+
+	if agent := ldMgr.getLogicalDeviceAgent(*logDeviceId); agent != nil {
+		return agent.addUNILogicalPort(ctx, childDevice, childDevice.ProxyAddress.ChannelId)
+	}
+	return status.Errorf(codes.NotFound, "%s", childDevice.Id)
+}