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/*
* 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 events
import (
"container/ring"
"context"
"errors"
"fmt"
"strconv"
"strings"
"sync"
"time"
"github.com/golang/protobuf/ptypes"
"github.com/opencord/voltha-lib-go/v4/pkg/events/eventif"
"github.com/opencord/voltha-lib-go/v4/pkg/kafka"
"github.com/opencord/voltha-lib-go/v4/pkg/log"
"github.com/opencord/voltha-protos/v4/go/voltha"
)
// TODO: Make configurable through helm chart
const EVENT_THRESHOLD = 1000
type lastEvent struct{}
type EventProxy struct {
kafkaClient kafka.Client
eventTopic kafka.Topic
eventQueue *EventQueue
queueCtx context.Context
queueCancelCtx context.CancelFunc
}
func NewEventProxy(opts ...EventProxyOption) *EventProxy {
var proxy EventProxy
for _, option := range opts {
option(&proxy)
}
proxy.eventQueue = newEventQueue()
proxy.queueCtx, proxy.queueCancelCtx = context.WithCancel(context.Background())
return &proxy
}
type EventProxyOption func(*EventProxy)
func MsgClient(client kafka.Client) EventProxyOption {
return func(args *EventProxy) {
args.kafkaClient = client
}
}
func MsgTopic(topic kafka.Topic) EventProxyOption {
return func(args *EventProxy) {
args.eventTopic = topic
}
}
func (ep *EventProxy) formatId(eventName string) string {
return fmt.Sprintf("Voltha.openolt.%s.%s", eventName, strconv.FormatInt(time.Now().UnixNano(), 10))
}
func (ep *EventProxy) getEventHeader(eventName string,
category eventif.EventCategory,
subCategory *eventif.EventSubCategory,
eventType eventif.EventType,
raisedTs int64) (*voltha.EventHeader, error) {
var header voltha.EventHeader
if strings.Contains(eventName, "_") {
eventName = strings.Join(strings.Split(eventName, "_")[:len(strings.Split(eventName, "_"))-2], "_")
} else {
eventName = "UNKNOWN_EVENT"
}
/* Populating event header */
header.Id = ep.formatId(eventName)
header.Category = category
if subCategory != nil {
header.SubCategory = *subCategory
} else {
header.SubCategory = voltha.EventSubCategory_NONE
}
header.Type = eventType
header.TypeVersion = eventif.EventTypeVersion
// raisedTs is in seconds
timestamp, err := ptypes.TimestampProto(time.Unix(raisedTs, 0))
if err != nil {
return nil, err
}
header.RaisedTs = timestamp
timestamp, err = ptypes.TimestampProto(time.Now())
if err != nil {
return nil, err
}
header.ReportedTs = timestamp
return &header, nil
}
/* Send out rpc events*/
func (ep *EventProxy) SendRPCEvent(ctx context.Context, id string, rpcEvent *voltha.RPCEvent, category eventif.EventCategory, subCategory *eventif.EventSubCategory, raisedTs int64) error {
if rpcEvent == nil {
logger.Error(ctx, "Received empty rpc event")
return errors.New("rpc event nil")
}
var event voltha.Event
var err error
if event.Header, err = ep.getEventHeader(id, category, subCategory, voltha.EventType_RPC_EVENT, raisedTs); err != nil {
return err
}
event.EventType = &voltha.Event_RpcEvent{RpcEvent: rpcEvent}
ep.eventQueue.push(&event)
return nil
}
/* Send out device events*/
func (ep *EventProxy) SendDeviceEvent(ctx context.Context, deviceEvent *voltha.DeviceEvent, category eventif.EventCategory, subCategory eventif.EventSubCategory, raisedTs int64) error {
if deviceEvent == nil {
logger.Error(ctx, "Recieved empty device event")
return errors.New("Device event nil")
}
var event voltha.Event
var de voltha.Event_DeviceEvent
var err error
de.DeviceEvent = deviceEvent
if event.Header, err = ep.getEventHeader(deviceEvent.DeviceEventName, category, &subCategory, voltha.EventType_DEVICE_EVENT, raisedTs); err != nil {
return err
}
event.EventType = &de
if err := ep.sendEvent(ctx, &event); err != nil {
logger.Errorw(ctx, "Failed to send device event to KAFKA bus", log.Fields{"device-event": deviceEvent})
return err
}
logger.Infow(ctx, "Successfully sent device event KAFKA", log.Fields{"Id": event.Header.Id, "Category": event.Header.Category,
"SubCategory": event.Header.SubCategory, "Type": event.Header.Type, "TypeVersion": event.Header.TypeVersion,
"ReportedTs": event.Header.ReportedTs, "ResourceId": deviceEvent.ResourceId, "Context": deviceEvent.Context,
"DeviceEventName": deviceEvent.DeviceEventName})
return nil
}
// SendKpiEvent is to send kpi events to voltha.event topic
func (ep *EventProxy) SendKpiEvent(ctx context.Context, id string, kpiEvent *voltha.KpiEvent2, category eventif.EventCategory, subCategory eventif.EventSubCategory, raisedTs int64) error {
if kpiEvent == nil {
logger.Error(ctx, "Recieved empty kpi event")
return errors.New("KPI event nil")
}
var event voltha.Event
var de voltha.Event_KpiEvent2
var err error
de.KpiEvent2 = kpiEvent
if event.Header, err = ep.getEventHeader(id, category, &subCategory, voltha.EventType_KPI_EVENT2, raisedTs); err != nil {
return err
}
event.EventType = &de
if err := ep.sendEvent(ctx, &event); err != nil {
logger.Errorw(ctx, "Failed to send kpi event to KAFKA bus", log.Fields{"device-event": kpiEvent})
return err
}
logger.Infow(ctx, "Successfully sent kpi event to KAFKA", log.Fields{"Id": event.Header.Id, "Category": event.Header.Category,
"SubCategory": event.Header.SubCategory, "Type": event.Header.Type, "TypeVersion": event.Header.TypeVersion,
"ReportedTs": event.Header.ReportedTs, "KpiEventName": "STATS_EVENT"})
return nil
}
func (ep *EventProxy) sendEvent(ctx context.Context, event *voltha.Event) error {
logger.Debugw(ctx, "Send event to kafka", log.Fields{"event": event})
if err := ep.kafkaClient.Send(ctx, event, &ep.eventTopic); err != nil {
return err
}
logger.Debugw(ctx, "Sent event to kafka", log.Fields{"event": event})
return nil
}
func (ep *EventProxy) EnableLivenessChannel(ctx context.Context, enable bool) chan bool {
return ep.kafkaClient.EnableLivenessChannel(ctx, enable)
}
func (ep *EventProxy) SendLiveness(ctx context.Context) error {
return ep.kafkaClient.SendLiveness(ctx)
}
// Start the event proxy
func (ep *EventProxy) Start() {
eq := ep.eventQueue
go eq.start(ep.queueCtx)
logger.Debugw(context.Background(), "event-proxy-starting...", log.Fields{"events-threashold": EVENT_THRESHOLD})
for {
// Notify the queue I am ready
eq.readyToSendToKafkaCh <- struct{}{}
// Wait for an event
elem, ok := <-eq.eventChannel
if !ok {
logger.Debug(context.Background(), "event-channel-closed-exiting")
break
}
// Check for last event
if _, ok := elem.(*lastEvent); ok {
// close the queuing loop
logger.Info(context.Background(), "received-last-event")
ep.queueCancelCtx()
break
}
ctx := context.Background()
event, ok := elem.(*voltha.Event)
if !ok {
logger.Warnw(ctx, "invalid-event", log.Fields{"element": elem})
continue
}
if err := ep.sendEvent(ctx, event); err != nil {
logger.Errorw(ctx, "failed-to-send-event-to-kafka-bus", log.Fields{"event": event})
} else {
logger.Debugw(ctx, "successfully-sent-rpc-event-to-kafka-bus", log.Fields{"id": event.Header.Id, "category": event.Header.Category,
"sub-category": event.Header.SubCategory, "type": event.Header.Type, "type-version": event.Header.TypeVersion,
"reported-ts": event.Header.ReportedTs, "event-type": event.EventType})
}
}
}
func (ep *EventProxy) Stop() {
ep.eventQueue.stop()
}
type EventQueue struct {
mutex sync.RWMutex
eventChannel chan interface{}
insertPosition *ring.Ring
popPosition *ring.Ring
dataToSendAvailable chan struct{}
readyToSendToKafkaCh chan struct{}
eventQueueStopped chan struct{}
}
func newEventQueue() *EventQueue {
ev := &EventQueue{
eventChannel: make(chan interface{}),
insertPosition: ring.New(EVENT_THRESHOLD),
dataToSendAvailable: make(chan struct{}),
readyToSendToKafkaCh: make(chan struct{}),
eventQueueStopped: make(chan struct{}),
}
ev.popPosition = ev.insertPosition
return ev
}
// push is invoked to push an event at the back of a queue
func (eq *EventQueue) push(event interface{}) {
eq.mutex.Lock()
if eq.insertPosition != nil {
// Handle Queue is full.
// TODO: Current default is to overwrite old data if queue is full. Is there a need to
// block caller if max threshold is reached?
if eq.insertPosition.Value != nil && eq.insertPosition == eq.popPosition {
eq.popPosition = eq.popPosition.Next()
}
// Insert data and move pointer to next empty position
eq.insertPosition.Value = event
eq.insertPosition = eq.insertPosition.Next()
// Check for last event
if _, ok := event.(*lastEvent); ok {
eq.insertPosition = nil
}
eq.mutex.Unlock()
// Notify waiting thread of data availability
eq.dataToSendAvailable <- struct{}{}
} else {
logger.Debug(context.Background(), "event-queue-is-closed-as-insert-position-is-cleared")
eq.mutex.Unlock()
}
}
// start starts the routine that extracts an element from the event queue and
// send it to the kafka sending routine to process.
func (eq *EventQueue) start(ctx context.Context) {
logger.Info(ctx, "starting-event-queue")
loop:
for {
select {
case <-eq.dataToSendAvailable:
// Do nothing - use to prevent caller pushing data to block
case <-eq.readyToSendToKafkaCh:
{
// Kafka sending routine is ready to process an event
eq.mutex.Lock()
element := eq.popPosition.Value
if element == nil {
// No events to send. Wait
eq.mutex.Unlock()
select {
case _, ok := <-eq.dataToSendAvailable:
if !ok {
// channel closed
eq.eventQueueStopped <- struct{}{}
return
}
case <-ctx.Done():
logger.Info(ctx, "event-queue-context-done")
eq.eventQueueStopped <- struct{}{}
return
}
eq.mutex.Lock()
element = eq.popPosition.Value
}
eq.popPosition.Value = nil
eq.popPosition = eq.popPosition.Next()
eq.mutex.Unlock()
eq.eventChannel <- element
}
case <-ctx.Done():
logger.Info(ctx, "event-queue-context-done")
eq.eventQueueStopped <- struct{}{}
break loop
}
}
logger.Info(ctx, "event-queue-stopped")
}
func (eq *EventQueue) stop() {
// Flush all
eq.push(&lastEvent{})
<-eq.eventQueueStopped
eq.mutex.Lock()
close(eq.readyToSendToKafkaCh)
close(eq.dataToSendAvailable)
close(eq.eventChannel)
eq.mutex.Unlock()
}