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| package main
import (
"context"
"fmt"
"log"
"sync"
"time"
"github.com/ClickHouse/clickhouse-go/v2"
"github.com/Shopify/sarama"
"github.com/buger/jsonparser"
)
// Order 定义订单数据结构
type Order struct {
OrderID string
UserID string
Amount float64
Timestamp time.Time
}
// OrderAggregate 定义聚合结果
type OrderAggregate struct {
WindowTime time.Time
OrderCount uint64
TotalAmount float64
}
// KafkaConsumer 消费 Kafka 数据并聚合
type KafkaConsumer struct {
consumer sarama.Consumer
aggregates chan OrderAggregate
clickhouse clickhouse.Conn
batch []OrderAggregate
batchSize int
batchTicker *time.Ticker
mutex sync.Mutex
}
func NewKafkaConsumer(brokers []string, topic string) (*KafkaConsumer, error) {
consumer, err := sarama.NewConsumer(brokers, nil)
if err != nil {
return nil, fmt.Errorf("failed to create consumer: %v", err)
}
conn, err := clickhouse.Open(&clickhouse.Options{
Addr: []string{"localhost:9000"},
Auth: clickhouse.Auth{
Database: "default",
Username: "default",
Password: "",
},
})
if err != nil {
return nil, fmt.Errorf("failed to connect to ClickHouse: %v", err)
}
return &KafkaConsumer{
consumer: consumer,
aggregates: make(chan OrderAggregate, 1000),
clickhouse: conn,
batch: make([]OrderAggregate, 0, 100),
batchSize: 100,
batchTicker: time.NewTicker(10 * time.Second),
}, nil
}
// Consume 消费 Kafka 数据并聚合
func (kc *KafkaConsumer) Consume(ctx context.Context, topic string) error {
partitionConsumer, err := kc.consumer.ConsumePartition(topic, 0, sarama.OffsetOldest)
if err != nil {
return fmt.Errorf("failed to consume partition: %v", err)
}
go kc.processAggregates(ctx)
for {
select {
case <-ctx.Done():
return partitionConsumer.Close()
case msg := <-partitionConsumer.Messages():
order, err := parseOrder(msg.Value)
if err != nil {
log.Printf("failed to parse order: %v", err)
continue
}
kc.aggregateOrder(order)
}
}
}
// parseOrder 解析 JSON 数据
func parseOrder(data []byte) (Order, error) {
orderID, err := jsonparser.GetString(data, "order_id")
if err != nil {
return Order{}, err
}
userID, err := jsonparser.GetString(data, "user_id")
if err != nil {
return Order{}, err
}
amount, err := jsonparser.GetFloat(data, "amount")
if err != nil {
return Order{}, err
}
timestampStr, err := jsonparser.GetString(data, "timestamp")
if err != nil {
return Order{}, err
}
timestamp, err := time.Parse(time.RFC3339, timestampStr)
if err != nil {
return Order{}, err
}
return Order{OrderID: orderID, UserID: userID, Amount: amount, Timestamp: timestamp}, nil
}
// aggregateOrder 按分钟窗口聚合
func (kc *KafkaConsumer) aggregateOrder(order Order) {
windowTime := order.Timestamp.Truncate(time.Minute)
aggregate := OrderAggregate{
WindowTime: windowTime,
OrderCount: 1,
TotalAmount: order.Amount,
}
kc.aggregates <- aggregate
}
// processAggregates 处理聚合数据并写入 ClickHouse
func (kc *KafkaConsumer) processAggregates(ctx context.Context) {
aggMap := make(map[time.Time]*OrderAggregate)
for {
select {
case <-ctx.Done():
kc.flushBatch()
return
case agg := <-kc.aggregates:
kc.mutex.Lock()
if existing, ok := aggMap[agg.WindowTime]; ok {
existing.OrderCount += agg.OrderCount
existing.TotalAmount += agg.TotalAmount
} else {
aggMap[agg.WindowTime] = &OrderAggregate{
WindowTime: agg.WindowTime,
OrderCount: agg.OrderCount,
TotalAmount: agg.TotalAmount,
}
}
kc.batch = append(kc.batch, *_aggMap[agg.WindowTime])
if len(kc.batch) >= kc.batchSize {
kc.flushBatch()
}
kc.mutex.Unlock()
case <-kc.batchTicker.C:
kc.mutex.Lock()
if len(kc.batch) > 0 {
kc.flushBatch()
}
kc.mutex.Unlock()
}
}
}
// flushBatch 批量写入 ClickHouse
func (kc *KafkaConsumer) flushBatch() {
if len(kc.batch) == 0 {
return
}
batch, err := kc.clickhouse.PrepareBatch(context.Background(), "INSERT INTO orders_dwd")
if err != nil {
log.Printf("failed to prepare batch: %v", err)
return
}
for _, agg := range kc.batch {
err = batch.Append(agg.WindowTime, agg.OrderCount, agg.TotalAmount)
if err != nil {
log.Printf("failed to append to batch: %v", err)
continue
}
}
if err := batch.Send(); err != nil {
log.Printf("failed to send batch: %v", err)
}
kc.batch = kc.batch[:0]
}
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
consumer, err := NewKafkaConsumer([]string{"localhost:9092"}, "orders")
if err != nil {
log.Fatalf("failed to initialize consumer: %v", err)
}
defer consumer.clickhouse.Close()
defer consumer.consumer.Close()
if err := consumer.Consume(ctx, "orders"); err != nil {
log.Fatalf("consumer error: %v", err)
}
}
|