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pulsar.go
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package main
import (
"context"
"encoding/json"
"github.com/apache/pulsar-client-go/pulsar"
log "github.com/sirupsen/logrus"
"math"
"reflect"
"time"
)
const eventJsonSchemaDef = `
{
"type": "record",
"name": "EventMessage",
"namespace": "game",
"fields": [
{
"name": "Type",
"type": "string"
},
{
"name": "Name",
"type": "string"
},
{
"name": "Avatar",
"type": "string"
},
{
"name": "Comment",
"type": "string",
"default": ""
},
{
"name": "X",
"type": "int"
},
{
"name": "Y",
"type": "int"
},
{
"name": "Alive",
"type": "boolean"
},
{
"name": "List",
"type": {
"type": "array",
"items" : {
"type":"int"
}
}
}
]
}
`
// EventMessage is the data in Pulsar
type EventMessage struct {
// Event type
Type string `json:"type"`
Name string `json:"name"`
Avatar string `json:"avatar"`
// Comment stores extra data
Comment string `json:"comment"`
X int `json:"x"`
Y int `json:"y"`
Alive bool `json:"alive"`
List []int `json:"list"`
}
type pulsarClient struct {
roomName, playerName string
client pulsar.Client
producer pulsar.Producer
consumer pulsar.Consumer
tableView pulsar.TableView
consumeCh chan pulsar.ConsumerMessage
// exclude type
exclusiveObstacleConsumer pulsar.Consumer
// to read the latest obstacle graph
obstacleReader pulsar.Reader
// subscribe the obstacle topic,
closeCh chan struct{}
}
func (c *pulsarClient) getEventTopicName() string {
return c.roomName + "-event-topic"
}
func (c *pulsarClient) getMapTopicName() string {
return c.roomName + "-map-topic"
}
func (c *pulsarClient) getEventSubscriptionName() string {
return c.playerName + "-event-sub"
}
func (c *pulsarClient) getMapSubscriptionName() string {
return c.playerName + "-map-sub"
}
func (c *pulsarClient) getUniqueMapSubscriptionName() string {
return c.roomName + "-map-sub"
}
func (c *pulsarClient) Close() {
c.producer.Close()
c.consumer.Close()
c.client.Close()
c.closeCh <- struct{}{}
c.tableView.Close()
close(c.closeCh)
close(c.consumeCh)
}
func newPulsarClient(roomName, playerName string) *pulsarClient {
topicName := roomName + "-event-topic"
subscriptionName := playerName
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: pulsarUrl,
})
if err != nil {
log.Fatal("[newPulsarClient]", err)
}
// player event topicName
producer, err := client.CreateProducer(pulsar.ProducerOptions{
Topic: topicName,
DisableBatching: true,
// use schema to confirm the structure of message
Schema: pulsar.NewJSONSchema(eventJsonSchemaDef, nil),
})
if err != nil {
log.Fatal(err)
}
consumeCh := make(chan pulsar.ConsumerMessage)
consumer, err := client.Subscribe(pulsar.ConsumerOptions{
Topic: topicName,
SubscriptionName: subscriptionName,
Type: pulsar.Exclusive,
MessageChannel: consumeCh,
// use schema to confirm the structure of message
Schema: pulsar.NewJSONSchema(eventJsonSchemaDef, nil),
})
if err != nil {
log.Fatal("this player has logged in")
}
// only handle new event
err = consumer.Seek(pulsar.LatestMessageID())
if err != nil {
log.Fatal(err)
}
tableView, err := client.CreateTableView(pulsar.TableViewOptions{
Topic: roomName + "-score-topic",
Schema: pulsar.NewStringSchema(nil),
SchemaValueType: reflect.TypeOf(""),
})
if err != nil {
log.Fatal(err)
}
return &pulsarClient{
tableView: tableView,
playerName: playerName,
roomName: roomName,
client: client,
producer: producer,
consumer: consumer,
consumeCh: consumeCh,
closeCh: make(chan struct{}),
}
}
// try grab exclusive consumer, if success, send new random graph
func (c *pulsarClient) tryUpdateObstacles() {
obstacleTopicName := c.getMapTopicName()
// every minute update random obstacle
if c.exclusiveObstacleConsumer == nil {
// all player will get same subscription name
obstacleSubscriptionName := c.getUniqueMapSubscriptionName()
obstacleConsumerCh := make(chan pulsar.ConsumerMessage)
obstacleConsumer, err := c.client.Subscribe(pulsar.ConsumerOptions{
Topic: obstacleTopicName,
// all player clients should have same subscription name
// then fail-over type can work
SubscriptionName: obstacleSubscriptionName,
// only one consumer can subscribe obstacle topic
Type: pulsar.Exclusive,
MessageChannel: obstacleConsumerCh,
SubscriptionInitialPosition: pulsar.SubscriptionPositionLatest,
})
if err != nil {
// subscription already has other consumers
return
}
c.exclusiveObstacleConsumer = obstacleConsumer
}
// now, this player is the first consumer, update the map
// obstacle topic producer
producer, err := c.client.CreateProducer(pulsar.ProducerOptions{
Topic: obstacleTopicName,
Schema: pulsar.NewJSONSchema(eventJsonSchemaDef, nil),
DisableBatching: true,
})
if err != nil {
log.Fatal(err)
}
defer producer.Close()
indestructibleObstacles := sample(totalGridCount, indestructibleObstacleCount)
var destructibleObstacles []int
for _, v := range sample(totalGridCount, indestructibleObstacleCount+destructibleObstacleCount) {
// ignore efficiency, just keep simple, brutal force deduplicate
if !sliceContains(indestructibleObstacles, v) {
// for destructibleObstacleType, we use negative number to present
destructibleObstacles = append(destructibleObstacles, -v)
}
}
InitObstacleMsg := &EventMessage{
Type: InitObstacleEventType,
List: append(indestructibleObstacles, destructibleObstacles...),
}
_, err = producer.Send(context.Background(), &pulsar.ProducerMessage{Value: InitObstacleMsg})
}
func (c *pulsarClient) readLatestEvent(topicName string) Event {
reader, err := c.client.CreateReader(pulsar.ReaderOptions{
Topic: topicName,
// get the latest message
StartMessageID: pulsar.LatestMessageID(),
StartMessageIDInclusive: true,
})
if err != nil {
log.Error("[readLatestEvent]", err)
}
defer reader.Close()
if reader.HasNext() {
msg, err := reader.Next(context.Background())
if err != nil {
log.Error("[readLatestEvent]", err)
}
actionMsg := EventMessage{}
err = json.Unmarshal(msg.Payload(), &actionMsg)
return convertMsgToEvent(&actionMsg)
}
return nil
}
// start to receive message from pulsar, forwarding to receiveCh
func (c *pulsarClient) start(in chan Event) chan Event {
// All players' action can be received from this channel
outCh := make(chan Event)
go func() {
for {
select {
// receive message from pulsar, forwarding to outCh
case cm := <-c.consumeCh:
msg := cm.Message
if msg == nil {
log.Warning("receive a nil message")
break
}
actionMsg := EventMessage{}
err := msg.GetSchemaValue(&actionMsg)
if err != nil {
log.Error("[start]", err)
break
}
l := math.Min(float64(len(msg.Payload())), 100)
log.Info("receive message from pulsar:\n", string(msg.Payload())[:int(l)])
cm.Ack(msg)
outCh <- convertMsgToEvent(&actionMsg)
// need to send message to pulsar
case action := <-in:
if action == nil {
log.Warning("send a nil message")
break
}
actionMsg := convertEventToMsg(action)
_, err := c.producer.Send(context.Background(), &pulsar.ProducerMessage{
Value: actionMsg,
})
if err != nil {
log.Error("send msg failed:", err)
break
}
//log.Info("send message to pulsar:\n", string(bytes))
case <-c.closeCh:
goto stop
}
stop:
}
}()
// handle obstacle topic
go func() {
// 1. try to init random map
c.tryUpdateObstacles()
// 2. read the latest random map
obstacleTopicName := c.getMapTopicName()
event := c.readLatestEvent(obstacleTopicName)
if event != nil {
outCh <- event
}
// 3. create consumer listener
obstacleConsumerCh := make(chan pulsar.ConsumerMessage)
consumer, err := c.client.Subscribe(pulsar.ConsumerOptions{
Topic: obstacleTopicName,
SubscriptionName: c.getMapSubscriptionName(),
Schema: pulsar.NewJSONSchema(eventJsonSchemaDef, nil),
Type: pulsar.Exclusive,
MessageChannel: obstacleConsumerCh,
})
if err != nil {
log.Fatal("[start][go func] cannot create map consumer", err)
}
//defer consumer.Unsubscribe()
defer consumer.Close()
err = consumer.Seek(pulsar.LatestMessageID())
if err != nil {
log.Fatal("[start][go func] cannot seek to latest message", err)
}
for {
select {
case <-time.Tick(time.Second * updateObstacleTime):
// every minute update random obstacle
c.tryUpdateObstacles()
case cm := <-obstacleConsumerCh:
msg := cm.Message
if msg == nil {
log.Error("receive nil form topic:", obstacleTopicName)
break
}
consumer.Ack(msg)
log.Infoln("read from map topic")
actionMsg := EventMessage{}
err := msg.GetSchemaValue(&actionMsg)
if err != nil {
log.Error("[start][read map event]", err)
break
}
outCh <- convertMsgToEvent(&actionMsg)
}
}
}()
return outCh
}
func convertEventToMsg(action Event) *EventMessage {
var msg *EventMessage
switch t := action.(type) {
case *UserMoveEvent:
msg = &EventMessage{
Type: UserMoveEventType,
Name: t.name,
Avatar: t.avatar,
X: t.pos.X,
Y: t.pos.Y,
Alive: t.alive,
}
case *UserJoinEvent:
msg = &EventMessage{
Type: UserJoinEventType,
Name: t.name,
Avatar: t.avatar,
X: t.pos.X,
Y: t.pos.Y,
Alive: t.alive,
}
case *UserDeadEvent:
msg = &EventMessage{
Type: UserDeadEventType,
Name: t.name,
Avatar: t.avatar,
X: t.pos.X,
Y: t.pos.Y,
// record the killer player name
Comment: t.killer,
Alive: false,
}
case *UserReviveEvent:
msg = &EventMessage{
Type: UserReviveEventType,
Name: t.name,
Avatar: t.avatar,
X: t.pos.X,
Y: t.pos.Y,
Alive: true,
}
case *SetBombEvent:
msg = &EventMessage{
Type: SetBombEventType,
Name: t.bombName,
X: t.pos.X,
Y: t.pos.Y,
}
case *BombMoveEvent:
msg = &EventMessage{
Type: MoveBombEventType,
Name: t.bombName,
X: t.pos.X,
Y: t.pos.Y,
}
case *ExplodeEvent:
msg = &EventMessage{
Type: ExplodeEventType,
Name: t.bombName,
X: t.pos.X,
Y: t.pos.Y,
}
case *UndoExplodeEvent:
msg = &EventMessage{
Type: UndoExplodeEventType,
X: t.pos.X,
Y: t.pos.Y,
}
case *UpdateMapEvent:
msg = &EventMessage{
Type: InitObstacleEventType,
List: t.Obstacles,
}
}
return msg
}
func convertMsgToEvent(msg *EventMessage) Event {
info := &playerInfo{
name: msg.Name,
avatar: msg.Avatar,
pos: Position{
X: msg.X,
Y: msg.Y,
},
alive: msg.Alive,
}
switch msg.Type {
case UserJoinEventType:
return &UserJoinEvent{
playerInfo: info,
}
case SetBombEventType:
return &SetBombEvent{
bombName: msg.Name,
pos: info.pos,
}
case MoveBombEventType:
return &BombMoveEvent{
bombName: msg.Name,
pos: info.pos,
}
case UserMoveEventType:
return &UserMoveEvent{
playerInfo: info,
}
case UserDeadEventType:
return &UserDeadEvent{
playerInfo: info,
killer: msg.Comment,
}
case UserReviveEventType:
return &UserReviveEvent{
playerInfo: info,
}
case ExplodeEventType:
return &ExplodeEvent{
bombName: msg.Name,
pos: info.pos,
}
case UndoExplodeEventType:
return &UndoExplodeEvent{
pos: info.pos,
}
case InitObstacleEventType:
return &UpdateMapEvent{
Obstacles: msg.List,
}
}
return nil
}