/
server.go
196 lines (171 loc) · 4.44 KB
/
server.go
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package kafka
import (
"context"
"errors"
"fmt"
"time"
"github.com/segmentio/kafka-go"
"github.com/sirupsen/logrus"
"github.com/sunjiangjun/xlog"
)
type Config struct {
Brokers []string
Topic string
Group string
Partition int
StartOffset int64
}
type EasyKafka struct {
log *logrus.Entry
Logf func(string, ...interface{})
}
func NewEasyKafka(xLog *xlog.XLog) *EasyKafka {
f := func(msg string, a ...interface{}) {
//xLog.Printf("kafka|msg=%v , other=%v", msg, a)
fmt.Println(msg, a)
}
x := xLog.WithField("subModel", "kafka")
return &EasyKafka{
log: x,
Logf: f,
}
}
func NewEasyKafka2(xLog *logrus.Entry) *EasyKafka {
f := func(msg string, a ...interface{}) {
//xLog.Printf("kafka|msg=%v , other=%v", msg, a)
fmt.Println(msg, a)
}
x := xLog.WithField("subModel", "kafka")
return &EasyKafka{
log: x,
Logf: f,
}
}
func (easy *EasyKafka) Read(c *Config, ch chan *kafka.Message, ctx context.Context) {
//if c.StartOffset == 0 {
// c.StartOffset = kafka.LastOffset
//}
r := kafka.NewReader(kafka.ReaderConfig{
Brokers: c.Brokers,
Topic: c.Topic,
Partition: c.Partition,
GroupID: c.Group,
MinBytes: 10e3, // 10KB
MaxBytes: 10e6, // 10MB
StartOffset: c.StartOffset,
Logger: kafka.LoggerFunc(easy.Logf),
ErrorLogger: kafka.LoggerFunc(easy.Logf),
})
//r.SetOffset(0)
defer func() {
if err := r.Close(); err != nil {
easy.log.Fatal("kafka|read| failed to close reader:", err)
}
}()
errCh := make(chan int)
interrupt := true
go func(r *kafka.Reader, ch chan *kafka.Message, errCh chan int) {
for interrupt {
m, err := r.ReadMessage(context.Background())
if err != nil {
easy.log.Errorf("kafka|read|ReadMessage err:%v", err)
errCh <- 1
break
}
//easy.log.Printf("kafka|read message at offset %d: %s ", m.Offset, string(m.Key))
ch <- &m
}
}(r, ch, errCh)
select {
case <-errCh:
break
case <-ctx.Done():
break
}
interrupt = false
time.Sleep(2 * time.Second)
}
func (easy *EasyKafka) WriteBatch(c *Config, ch chan []*kafka.Message, resp func([]*kafka.Message), parent context.Context, count int) {
query := make(chan int, count)
for {
query <- 1
go func(c *Config, ch chan []*kafka.Message, resp func([]*kafka.Message), parent context.Context) {
ctx, cancel := context.WithCancel(parent)
defer cancel()
easy.Write(*c, ch, resp, ctx)
<-query
}(c, ch, resp, parent)
}
}
func (easy *EasyKafka) Write(c Config, ch chan []*kafka.Message, resp func([]*kafka.Message), ctx context.Context) {
// make a writer that produces to topic-A, using the least-bytes distribution
var f kafka.BalancerFunc = func(message kafka.Message, i ...int) int {
return message.Partition
}
w := &kafka.Writer{
Addr: kafka.TCP(c.Brokers...),
//Topic: c.Topic,
Balancer: f,
Logger: kafka.LoggerFunc(easy.Logf),
ErrorLogger: kafka.LoggerFunc(easy.Logf),
BatchBytes: 70e6,
BatchSize: 100,
AllowAutoTopicCreation: true,
}
defer func() {
if err := w.Close(); err != nil {
easy.log.Fatal("kafka|write| failed to close writer:", err)
}
}()
running := true
go func(ctx context.Context) {
<-ctx.Done()
running = false
}(ctx)
for running {
//easy.log.Printf("kafka|Write|length=%v", len(ch))
ms := <-ch
step := 20
for i := 0; i < len(ms); i += step {
n := i + step
if len(ms) <= n {
n = len(ms)
}
err := easy.sendToKafka(w, ms[i:n], resp)
if err != nil {
running = false
break
}
}
}
}
func (easy *EasyKafka) sendToKafka(w *kafka.Writer, ms []*kafka.Message, resp func([]*kafka.Message)) error {
//start := time.Now()
//defer func() {
// easy.log.Printf("sendToKafka.durtion:%v, len(ms):%v", time.Now().Sub(start), len(ms))
//}()
temp := make([]kafka.Message, 0, len(ms))
for _, v := range ms {
//easy.log.Printf("kafka|topic=%v p=%v,key=%v,value=%v", v.Topic, v.Partition, string(v.Key), string(v.Value))
temp = append(temp, *v)
}
ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
defer cancel()
const retries = 5
for i := 0; i < retries; i++ {
err := w.WriteMessages(ctx, temp...)
if errors.Is(err, kafka.LeaderNotAvailable) || errors.Is(err, context.DeadlineExceeded) {
time.Sleep(time.Millisecond * 500)
continue
}
if err != nil {
easy.log.Errorf("kafka|sendToKafka|failed to write messages:%v", err)
return err
}
break
}
if resp != nil {
resp(ms)
}
return nil
}