WIP [VOL-2811] - Incorporate preliminary onu-adapter-go code into opencord repo

- functionality: reason "initial-mib-downloaded" reached
- omciAgent removed, object relation restructured
- adapter code restructuring + internal lib interface update

Change-Id: Ie53450a5e2c093aaaf68fe652f95e7b4c4a014c7
Signed-off-by: Holger Hildebrandt <holger.hildebrandt@adtran.com>
diff --git a/internal/pkg/onuadaptercore/onu_uni_port.go b/internal/pkg/onuadaptercore/onu_uni_port.go
new file mode 100644
index 0000000..adf2b6c
--- /dev/null
+++ b/internal/pkg/onuadaptercore/onu_uni_port.go
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2020-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 adaptercoreonu provides the utility for onu devices, flows and statistics
+package adaptercoreonu
+
+import (
+	"context"
+	"errors"
+	"strconv"
+
+	//"sync"
+	//"time"
+
+	//"github.com/opencord/voltha-lib-go/v3/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	vc "github.com/opencord/voltha-protos/v3/go/common"
+	"github.com/opencord/voltha-protos/v3/go/voltha"
+	//ic "github.com/opencord/voltha-protos/v3/go/inter_container"
+	//"github.com/opencord/voltha-protos/v3/go/openflow_13"
+	//"github.com/opencord/voltha-protos/v3/go/voltha"
+)
+
+type UniPortType uint8
+
+const (
+	// Uni Interface type
+	UniPPTP UniPortType = 0 // relates to PPTP
+	UniVEIP UniPortType = 1 // relates to VEIP
+)
+
+//OntDeviceEntry structure holds information about the attached FSM'as and their communication
+type OnuUniPort struct {
+	enabled    bool
+	name       string
+	portNo     uint32
+	portType   UniPortType
+	ofpPortNo  string
+	uniId      uint16
+	macBpNo    uint16
+	entityId   uint16
+	adminState vc.AdminState_Types
+	operState  vc.OperStatus_Types
+	pPort      *voltha.Port
+}
+
+//NewOnuUniPort returns a new instance of a OnuUniPort
+func NewOnuUniPort(a_uniId uint16, a_portNo uint32, a_InstNo uint16,
+	a_portType UniPortType) *OnuUniPort {
+	logger.Infow("init-onuUniPort", log.Fields{"uniId": a_uniId,
+		"portNo": a_portNo, "InstNo": a_InstNo, "type": a_portType})
+	var onuUniPort OnuUniPort
+	onuUniPort.enabled = false
+	onuUniPort.name = "uni-" + strconv.FormatUint(uint64(a_portNo), 10)
+	onuUniPort.portNo = a_portNo
+	onuUniPort.portType = a_portType
+	// so far it seems as here ofpPortNo/Name ist the same as the original port name ...??
+	onuUniPort.ofpPortNo = onuUniPort.name
+	onuUniPort.uniId = a_uniId
+	onuUniPort.macBpNo = a_uniId + 1 //ensure >0 instanceNo
+	onuUniPort.entityId = a_InstNo
+	onuUniPort.adminState = vc.AdminState_ENABLED //enabled per create
+	onuUniPort.operState = vc.OperStatus_UNKNOWN
+	onuUniPort.pPort = nil // to be set on create
+	return &onuUniPort
+}
+
+//Start starts (logs) the omci agent
+func (oo *OnuUniPort) CreateVolthaPort(a_pDeviceHandler *DeviceHandler) error {
+	logger.Debug("adding-uni-port")
+	pUniPort := &voltha.Port{
+		PortNo:     oo.portNo,
+		Label:      oo.name,
+		Type:       voltha.Port_ETHERNET_UNI,
+		AdminState: oo.adminState,
+		OperStatus: oo.operState,
+		// obviously empty peer setting
+	}
+	if pUniPort != nil {
+		if err := a_pDeviceHandler.coreProxy.PortCreated(context.TODO(),
+			a_pDeviceHandler.deviceID, pUniPort); err != nil {
+			logger.Fatalf("adding-uni-port: create-VOLTHA-Port-failed-%s", err)
+			return err
+		}
+		logger.Infow("Voltha onuUniPort-added", log.Fields{"for PortNo": oo.portNo})
+		oo.pPort = pUniPort
+		oo.operState = vc.OperStatus_DISCOVERED
+	} else {
+		logger.Warnw("could not create Voltha UniPort - nil pointer",
+			log.Fields{"for PortNo": oo.portNo})
+		return errors.New("create Voltha UniPort failed")
+	}
+	return nil
+}