[VOL-2235] Mocks and interfaces for rw-core

This update consists of mocks that are used by the rw-core
during unit testing.  It also includes interfaces used for unit
tests.

Change-Id: I20ca1455c358113c3aa897acc6355e0ddbc614b7
diff --git a/rw_core/core/adapter_proxy_test.go b/rw_core/core/adapter_proxy_test.go
new file mode 100755
index 0000000..e6e0ecb
--- /dev/null
+++ b/rw_core/core/adapter_proxy_test.go
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2019-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"
+	"crypto/rand"
+	cm "github.com/opencord/voltha-go/rw_core/mocks"
+	com "github.com/opencord/voltha-lib-go/v2/pkg/adapters/common"
+	"github.com/opencord/voltha-lib-go/v2/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	lm "github.com/opencord/voltha-lib-go/v2/pkg/mocks"
+	of "github.com/opencord/voltha-protos/v2/go/openflow_13"
+	"github.com/opencord/voltha-protos/v2/go/voltha"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"testing"
+	"time"
+)
+
+const (
+	coreName       = "rw_core"
+	adapterName    = "adapter_mock"
+	coreInstanceId = "1000"
+)
+
+var (
+	coreKafkaICProxy    *kafka.InterContainerProxy
+	adapterKafkaICProxy *kafka.InterContainerProxy
+	kc                  kafka.Client
+	adapterReqHandler   *com.RequestHandlerProxy
+	adapter             *cm.Adapter
+)
+
+func init() {
+	if _, err := log.SetDefaultLogger(log.JSON, 0, log.Fields{"instanceId": coreInstanceId}); err != nil {
+		log.With(log.Fields{"error": err}).Fatal("Cannot setup logging")
+	}
+	// Set the log level to Warning
+	log.SetAllLogLevel(2)
+
+	var err error
+
+	// Create the KV client
+	kc = lm.NewKafkaClient()
+
+	// Setup core inter-container proxy and core request handler
+	if coreKafkaICProxy, err = kafka.NewInterContainerProxy(
+		kafka.MsgClient(kc),
+		kafka.DefaultTopic(&kafka.Topic{Name: coreName})); err != nil || coreKafkaICProxy == nil {
+		log.Fatalw("Failure-creating-core-intercontainerProxy", log.Fields{"error": err})
+
+	}
+	if err := coreKafkaICProxy.Start(); err != nil {
+		log.Fatalw("Failure-starting-core-kafka-intercontainerProxy", log.Fields{"error": err})
+	}
+	if err := coreKafkaICProxy.SubscribeWithDefaultRequestHandler(kafka.Topic{Name: coreName}, 0); err != nil {
+		log.Fatalw("Failure-subscribing-core-request-handler", log.Fields{"error": err})
+	}
+
+	// Setup adapter inter-container proxy and adapter request handler
+	adapterCoreProxy := com.NewCoreProxy(nil, adapterName, coreName)
+	adapter = cm.NewAdapter(adapterCoreProxy)
+	adapterReqHandler = com.NewRequestHandlerProxy(coreInstanceId, adapter, adapterCoreProxy)
+	if adapterKafkaICProxy, err = kafka.NewInterContainerProxy(
+		kafka.MsgClient(kc),
+		kafka.DefaultTopic(&kafka.Topic{Name: adapterName}),
+		kafka.RequestHandlerInterface(adapterReqHandler)); err != nil || adapterKafkaICProxy == nil {
+		log.Fatalw("Failure-creating-adapter-intercontainerProxy", log.Fields{"error": err})
+	}
+	if err = adapterKafkaICProxy.Start(); err != nil {
+		log.Fatalw("Failure-starting-adapter-kafka-intercontainerProxy", log.Fields{"error": err})
+	}
+	if err = adapterKafkaICProxy.SubscribeWithDefaultRequestHandler(kafka.Topic{Name: adapterName}, 0); err != nil {
+		log.Fatalw("Failure-subscribing-adapter-request-handler", log.Fields{"error": err})
+	}
+}
+
+func getRandomBytes(size int) (bytes []byte, err error) {
+	bytes = make([]byte, size)
+	_, err = rand.Read(bytes)
+	return
+}
+
+func TestCreateAdapterProxy(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	assert.NotNil(t, ap)
+}
+
+func testSimpleRequests(t *testing.T) {
+	type simpleRequest func(context.Context, *voltha.Device) error
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	simpleRequests := []simpleRequest{
+		ap.AdoptDevice,
+		ap.DisableDevice,
+		ap.RebootDevice,
+		ap.DeleteDevice,
+		ap.ReconcileDevice,
+		ap.ReEnableDevice,
+	}
+	for _, f := range simpleRequests {
+		//Success
+		d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+		ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+		err := f(ctx, d)
+		cancel()
+		assert.Nil(t, err)
+
+		//	Failure - invalid adapter
+		expectedError := status.Error(codes.Canceled, "context deadline exceeded")
+		d = &voltha.Device{Id: "deviceId", Adapter: "adapter_mock_1"}
+		ctx, cancel = context.WithTimeout(context.Background(), 20*time.Millisecond)
+		err = f(ctx, d)
+		cancel()
+		assert.NotNil(t, err)
+		assert.Equal(t, expectedError.Error(), err.Error())
+
+		// Failure - short timeout
+		expectedError = status.Error(codes.Canceled, "context deadline exceeded")
+		d = &voltha.Device{Id: "deviceId", Adapter: adapterName}
+		ctx, cancel = context.WithTimeout(context.Background(), 100*time.Nanosecond)
+		err = f(ctx, d)
+		cancel()
+		assert.NotNil(t, err)
+		assert.Equal(t, expectedError.Error(), err.Error())
+	}
+}
+
+func testGetSwitchCapabilityFromAdapter(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	switchCap, err := ap.GetOfpDeviceInfo(ctx, d)
+	cancel()
+	assert.Nil(t, err)
+	assert.NotNil(t, switchCap)
+	expectedCap, _ := adapter.Get_ofp_device_info(d)
+	assert.Equal(t, switchCap.String(), expectedCap.String())
+}
+
+func testGetPortInfoFromAdapter(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	portNo := uint32(1)
+	portInfo, err := ap.GetOfpPortInfo(ctx, d, portNo)
+	cancel()
+	assert.Nil(t, err)
+	assert.NotNil(t, portInfo)
+	expectedPortInfo, _ := adapter.Get_ofp_port_info(d, int64(portNo))
+	assert.Equal(t, portInfo.String(), expectedPortInfo.String())
+}
+
+func testPacketOut(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+	outPort := uint32(1)
+	packet, err := getRandomBytes(50)
+	assert.Nil(t, err)
+	err = ap.packetOut(adapterName, d.Id, outPort, &of.OfpPacketOut{Data: packet})
+	assert.Nil(t, err)
+}
+
+func testFlowUpdates(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+	err := ap.UpdateFlowsBulk(d, &voltha.Flows{}, &voltha.FlowGroups{}, &voltha.FlowMetadata{})
+	assert.Nil(t, err)
+	flowChanges := &voltha.FlowChanges{ToAdd: &voltha.Flows{Items: nil}, ToRemove: &voltha.Flows{Items: nil}}
+	groupChanges := &voltha.FlowGroupChanges{ToAdd: &voltha.FlowGroups{Items: nil}, ToRemove: &voltha.FlowGroups{Items: nil}, ToUpdate: &voltha.FlowGroups{Items: nil}}
+	err = ap.UpdateFlowsIncremental(d, flowChanges, groupChanges, &voltha.FlowMetadata{})
+	assert.Nil(t, err)
+}
+
+func testPmUpdates(t *testing.T) {
+	ap := NewAdapterProxy(coreKafkaICProxy, coreName)
+	d := &voltha.Device{Id: "deviceId", Adapter: adapterName}
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	err := ap.UpdatePmConfigs(ctx, d, &voltha.PmConfigs{})
+	cancel()
+	assert.Nil(t, err)
+}
+
+func TestSuite(t *testing.T) {
+	//1. Test the simple requests first
+	testSimpleRequests(t)
+
+	//2.  Test get switch capability
+	testGetSwitchCapabilityFromAdapter(t)
+
+	//3.  Test get port info
+	testGetPortInfoFromAdapter(t)
+
+	//4. Test PacketOut
+	testPacketOut(t)
+
+	//	5. Test flow updates
+	testFlowUpdates(t)
+
+	//6. Pm configs
+	testPmUpdates(t)
+}