VOL-1174: Ported transaction support to go data model

Change-Id: I4cabefac36c95f690aa121c71f36b6aaf41180b0
diff --git a/db/model/transaction_test.go b/db/model/transaction_test.go
new file mode 100644
index 0000000..4a0cc29
--- /dev/null
+++ b/db/model/transaction_test.go
@@ -0,0 +1,157 @@
+/*
+ * 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 model
+
+import (
+	"github.com/opencord/voltha-go/protos/voltha"
+	"github.com/opencord/voltha-go/common/log"
+	"testing"
+	"github.com/google/uuid"
+	"encoding/hex"
+	"strconv"
+	"reflect"
+)
+
+type transactionTest struct {
+	Root        *Root
+	Backend     *Backend
+	Proxy       *Proxy
+	DbPrefix    string
+	DbType      string
+	DbHost      string
+	DbPort      int
+	DbTimeout   int
+}
+
+var (
+	tx = &transactionTest{
+		DbPrefix: "service/voltha/data/core/0001",
+		DbType:   "etcd",
+		//DbHost:    "10.102.58.0",
+		DbHost:    "localhost",
+		DbPort:    2379,
+		DbTimeout: 5,
+	}
+	txTargetDevId string
+	txDevId string
+)
+
+func init() {
+	if _, err := log.SetLogger(log.CONSOLE, 0, log.Fields{"instanceId": "transaction_test"}); err != nil {
+		log.With(log.Fields{"error": err}).Fatal("cannot setup logging")
+	}
+	defer log.CleanUp()
+
+	tx.Backend = NewBackend(tx.DbType, tx.DbHost, tx.DbPort, tx.DbTimeout, tx.DbPrefix)
+
+	msgClass := &voltha.Voltha{}
+	root := NewRoot(msgClass, tx.Backend, nil)
+	tx.Root = root.Load(msgClass)
+
+	GetProfiling().Report()
+
+	tx.Proxy = tx.Root.Node.GetProxy("/", false)
+
+}
+
+func Test_Transaction_1_GetDevices(t *testing.T) {
+	getTx := tx.Proxy.openTransaction()
+
+	devices := getTx.Get("/devices", 1, false)
+
+	if len(devices.([]interface{})) == 0 {
+		t.Error("there are no available devices to retrieve")
+	} else {
+		// Save the target device id for later tests
+		txTargetDevId = devices.([]interface{})[0].(*voltha.Device).Id
+		t.Logf("retrieved devices: %+v", devices)
+	}
+
+	tx.Proxy.commitTransaction(getTx.txid)
+}
+
+func Test_Transaction_2_GetDevice(t *testing.T) {
+
+	basePath := "/devices/" + txTargetDevId
+
+	getDevWithPortsTx := tx.Proxy.openTransaction()
+	device1 := getDevWithPortsTx.Get(basePath+"/ports", 1, false)
+	t.Logf("retrieved device with ports: %+v", device1)
+	tx.Proxy.commitTransaction(getDevWithPortsTx.txid)
+
+	getDevTx := tx.Proxy.openTransaction()
+	device2 := getDevTx.Get(basePath, 0, false)
+	t.Logf("retrieved device: %+v", device2)
+	tx.Proxy.commitTransaction(getDevTx.txid)
+}
+
+func Test_Transaction_3_AddDevice(t *testing.T) {
+	devIdBin, _ := uuid.New().MarshalBinary()
+	txDevId = "0001" + hex.EncodeToString(devIdBin)[:12]
+
+	device := &voltha.Device{
+		Id:         txDevId,
+		Type:       "simulated_olt",
+		Address:    &voltha.Device_HostAndPort{HostAndPort: "1.2.3.4:5555"},
+		AdminState: voltha.AdminState_PREPROVISIONED,
+	}
+
+	addTx := tx.Proxy.openTransaction()
+
+	if added := addTx.Add("/devices", device); added == nil {
+		t.Error("Failed to add device")
+	} else {
+		t.Logf("Added device : %+v", added)
+	}
+	tx.Proxy.commitTransaction(addTx.txid)
+}
+
+func Test_Transaction_4_UpdateDevice(t *testing.T) {
+	updateTx := tx.Proxy.openTransaction()
+	if retrieved := updateTx.Get("/devices/"+txTargetDevId, 1, false); retrieved == nil {
+		t.Error("Failed to get device")
+	} else {
+		var fwVersion int
+		if retrieved.(*voltha.Device).FirmwareVersion == "n/a" {
+			fwVersion = 0
+		} else {
+			fwVersion, _ = strconv.Atoi(retrieved.(*voltha.Device).FirmwareVersion)
+			fwVersion += 1
+		}
+
+		cloned := reflect.ValueOf(retrieved).Elem().Interface().(voltha.Device)
+		cloned.FirmwareVersion = strconv.Itoa(fwVersion)
+		t.Logf("Before update : %+v", cloned)
+
+		// FIXME: The makeBranch passed in function is nil or not being executed properly!!!!!
+		if afterUpdate := updateTx.Update("/devices/"+txTargetDevId, &cloned, false); afterUpdate == nil {
+			t.Error("Failed to update device")
+		} else {
+			t.Logf("Updated device : %+v", afterUpdate.(Revision).GetData())
+		}
+	}
+	tx.Proxy.commitTransaction(updateTx.txid)
+}
+
+func Test_Transaction_5_RemoveDevice(t *testing.T) {
+	removeTx := tx.Proxy.openTransaction()
+	if removed := removeTx.Remove("/devices/"+txDevId); removed == nil {
+		t.Error("Failed to remove device")
+	} else {
+		t.Logf("Removed device : %+v", removed)
+	}
+	tx.Proxy.commitTransaction(removeTx.txid)
+}