[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/vendor/github.com/opencord/voltha-lib-go/v2/pkg/mocks/kafka_client.go b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/mocks/kafka_client.go
new file mode 100644
index 0000000..79cdfbc
--- /dev/null
+++ b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/mocks/kafka_client.go
@@ -0,0 +1,133 @@
+/*
+ * 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 mocks
+
+import (
+	"fmt"
+	"github.com/opencord/voltha-lib-go/v2/pkg/kafka"
+	"github.com/opencord/voltha-lib-go/v2/pkg/log"
+	ic "github.com/opencord/voltha-protos/v2/go/inter_container"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"sync"
+)
+
+type KafkaClient struct {
+	topicsChannelMap map[string][]chan *ic.InterContainerMessage
+	lock             sync.RWMutex
+}
+
+func NewKafkaClient() *KafkaClient {
+	return &KafkaClient{
+		topicsChannelMap: make(map[string][]chan *ic.InterContainerMessage),
+		lock:             sync.RWMutex{},
+	}
+}
+
+func (kc *KafkaClient) Start() error {
+	log.Debug("kafka-client-started")
+	return nil
+}
+
+func (kc *KafkaClient) Stop() {
+	kc.lock.Lock()
+	defer kc.lock.Unlock()
+	for topic, chnls := range kc.topicsChannelMap {
+		for _, c := range chnls {
+			close(c)
+		}
+		delete(kc.topicsChannelMap, topic)
+	}
+	log.Debug("kafka-client-stopped")
+}
+
+func (kc *KafkaClient) CreateTopic(topic *kafka.Topic, numPartition int, repFactor int) error {
+	log.Debugw("CreatingTopic", log.Fields{"topic": topic.Name, "numPartition": numPartition, "replicationFactor": repFactor})
+	kc.lock.Lock()
+	defer kc.lock.Unlock()
+	if _, ok := kc.topicsChannelMap[topic.Name]; ok {
+		return fmt.Errorf("Topic %s already exist", topic.Name)
+	}
+	ch := make(chan *ic.InterContainerMessage)
+	kc.topicsChannelMap[topic.Name] = append(kc.topicsChannelMap[topic.Name], ch)
+	return nil
+}
+
+func (kc *KafkaClient) DeleteTopic(topic *kafka.Topic) error {
+	log.Debugw("DeleteTopic", log.Fields{"topic": topic.Name})
+	kc.lock.Lock()
+	defer kc.lock.Unlock()
+	delete(kc.topicsChannelMap, topic.Name)
+	return nil
+}
+
+func (kc *KafkaClient) Subscribe(topic *kafka.Topic, kvArgs ...*kafka.KVArg) (<-chan *ic.InterContainerMessage, error) {
+	log.Debugw("Subscribe", log.Fields{"topic": topic.Name, "args": kvArgs})
+	kc.lock.Lock()
+	defer kc.lock.Unlock()
+	ch := make(chan *ic.InterContainerMessage)
+	kc.topicsChannelMap[topic.Name] = append(kc.topicsChannelMap[topic.Name], ch)
+	return ch, nil
+}
+
+func removeChannel(s []chan *ic.InterContainerMessage, i int) []chan *ic.InterContainerMessage {
+	s[i] = s[len(s)-1]
+	return s[:len(s)-1]
+}
+
+func (kc *KafkaClient) UnSubscribe(topic *kafka.Topic, ch <-chan *ic.InterContainerMessage) error {
+	log.Debugw("UnSubscribe", log.Fields{"topic": topic.Name})
+	kc.lock.Lock()
+	defer kc.lock.Unlock()
+	if chnls, ok := kc.topicsChannelMap[topic.Name]; ok {
+		idx := -1
+		for i, c := range chnls {
+			if c == ch {
+				close(c)
+				idx = i
+			}
+		}
+		if idx >= 0 {
+			kc.topicsChannelMap[topic.Name] = removeChannel(kc.topicsChannelMap[topic.Name], idx)
+		}
+	}
+	return nil
+}
+
+func (kc *KafkaClient) Send(msg interface{}, topic *kafka.Topic, keys ...string) error {
+	req, ok := msg.(*ic.InterContainerMessage)
+	if !ok {
+		return status.Error(codes.InvalidArgument, "msg-not-InterContainerMessage-type")
+	}
+	if req == nil {
+		return status.Error(codes.InvalidArgument, "msg-nil")
+	}
+	kc.lock.RLock()
+	defer kc.lock.RUnlock()
+	for _, ch := range kc.topicsChannelMap[topic.Name] {
+		log.Debugw("Publishing", log.Fields{"fromTopic": req.Header.FromTopic, "toTopic": topic.Name, "id": req.Header.Id})
+		ch <- req
+	}
+	return nil
+}
+
+func (kc *KafkaClient) SendLiveness() error {
+	return status.Error(codes.Unimplemented, "SendLiveness")
+}
+
+func (kc *KafkaClient) EnableLivenessChannel(enable bool) chan bool {
+	return nil
+}