blob: ea410ac08feb64721562deb7d20da95294434bd8 [file] [log] [blame]
/*
* 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 kafka
import (
"context"
"fmt"
"sync"
"time"
"github.com/golang/protobuf/proto"
"github.com/opencord/voltha-lib-go/v7/pkg/kafka"
"github.com/opencord/voltha-lib-go/v7/pkg/log"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
const (
maxConcurrentMessage = 100
)
// static check to ensure KafkaClient implements kafka.Client
var _ kafka.Client = &KafkaClient{}
type KafkaClient struct {
topicsChannelMap map[string][]chan proto.Message
lock sync.RWMutex
alive bool
livenessMutex sync.Mutex
liveness chan bool
}
func NewKafkaClient() *KafkaClient {
return &KafkaClient{
topicsChannelMap: make(map[string][]chan proto.Message),
lock: sync.RWMutex{},
}
}
func (kc *KafkaClient) Start(ctx context.Context) error {
logger.Debug(ctx, "kafka-client-started")
return nil
}
func (kc *KafkaClient) Stop(ctx context.Context) {
kc.lock.Lock()
defer kc.lock.Unlock()
for topic, chnls := range kc.topicsChannelMap {
for _, c := range chnls {
close(c)
}
delete(kc.topicsChannelMap, topic)
}
logger.Debug(ctx, "kafka-client-stopped")
}
func (kc *KafkaClient) CreateTopic(ctx context.Context, topic *kafka.Topic, numPartition int, repFactor int) error {
logger.Debugw(ctx, "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 proto.Message)
kc.topicsChannelMap[topic.Name] = append(kc.topicsChannelMap[topic.Name], ch)
return nil
}
func (kc *KafkaClient) DeleteTopic(ctx context.Context, topic *kafka.Topic) error {
logger.Debugw(ctx, "DeleteTopic", log.Fields{"topic": topic.Name})
kc.lock.Lock()
defer kc.lock.Unlock()
delete(kc.topicsChannelMap, topic.Name)
return nil
}
func (kc *KafkaClient) Subscribe(ctx context.Context, topic *kafka.Topic, kvArgs ...*kafka.KVArg) (<-chan proto.Message, error) {
logger.Debugw(ctx, "Subscribe", log.Fields{"topic": topic.Name, "args": kvArgs})
kc.lock.Lock()
defer kc.lock.Unlock()
ch := make(chan proto.Message, maxConcurrentMessage)
kc.topicsChannelMap[topic.Name] = append(kc.topicsChannelMap[topic.Name], ch)
return ch, nil
}
func removeChannel(s []chan proto.Message, i int) []chan proto.Message {
s[i] = s[len(s)-1]
return s[:len(s)-1]
}
func (kc *KafkaClient) UnSubscribe(ctx context.Context, topic *kafka.Topic, ch <-chan proto.Message) error {
logger.Debugw(ctx, "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) SubscribeForMetadata(ctx context.Context, _ func(fromTopic string, timestamp time.Time)) {
logger.Debug(ctx, "SubscribeForMetadata - unimplemented")
}
func (kc *KafkaClient) Send(ctx context.Context, msg interface{}, topic *kafka.Topic, keys ...string) error {
// Assert message is a proto message
protoMsg, ok := msg.(proto.Message)
if !ok {
logger.Warnw(ctx, "message-not-a-proto-message", log.Fields{"msg": msg})
return status.Error(codes.InvalidArgument, "msg-not-a-proto-msg")
}
kc.lock.RLock()
defer kc.lock.RUnlock()
for _, ch := range kc.topicsChannelMap[topic.Name] {
select {
case ch <- protoMsg:
logger.Debugw(ctx, "publishing", log.Fields{"toTopic": topic.Name, "msg": protoMsg})
default:
logger.Debugw(ctx, "ignoring-event-channel-busy", log.Fields{"toTopic": topic.Name, "msg": protoMsg})
}
}
return nil
}
func (kc *KafkaClient) SendLiveness(ctx context.Context) error {
kc.livenessMutex.Lock()
defer kc.livenessMutex.Unlock()
if kc.liveness != nil {
kc.liveness <- true // I am a mock
}
return nil
}
func (kc *KafkaClient) EnableLivenessChannel(ctx context.Context, enable bool) chan bool {
logger.Infow(ctx, "kafka-enable-liveness-channel", log.Fields{"enable": enable})
if enable {
kc.livenessMutex.Lock()
defer kc.livenessMutex.Unlock()
if kc.liveness == nil {
logger.Info(ctx, "kafka-create-liveness-channel")
kc.liveness = make(chan bool, 10)
// post intial state to the channel
kc.liveness <- kc.alive
}
} else {
panic("Turning off liveness reporting is not supported")
}
return kc.liveness
}
func (kc *KafkaClient) EnableHealthinessChannel(ctx context.Context, enable bool) chan bool {
logger.Debug(ctx, "EnableHealthinessChannel - unimplemented")
return nil
}