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Kafka.go
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Kafka.go
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package kafkaHelper
import (
"context"
"errors"
"fmt"
"io"
"os"
"time"
"github.com/diadata-org/diadata/pkg/dia"
"github.com/diadata-org/diadata/pkg/utils"
"github.com/segmentio/kafka-go"
"github.com/segmentio/kafka-go/compress"
log "github.com/sirupsen/logrus"
)
const (
messageSizeMax = 1e8
)
type KafkaMessage interface {
MarshalBinary() ([]byte, error)
}
type KafkaMessageWithAHash interface {
Hash() string
}
const (
TopicIndexBlock = 0
TopicFiltersBlock = 1
TopicTrades = 2
TopicTradesBlock = 3
// The replica topics can be used to forward trades and blocks to other services in parallel.
TopicFiltersBlockReplica = 4
TopicTradesReplica = 5
TopicTradesBlockReplica = 6
TopicTradesEstimation = 7
TopicFiltersBlockDone = 14
TopicFiltersBlockTest = 21
TopicTradesTest = 22
TopicTradesBlockTest = 23
TopicNFTTrades = 24
TopicNFTTradesTest = 25
retryDelay = 2 * time.Second
)
type Config struct {
KafkaUrl []string
}
var (
KafkaConfig Config
topicSuffix string
)
func GetTopic(topic int) string {
return getTopic(topic)
}
func getTopic(topic int) string {
topicMap := map[int]string{
1: "filtersBlock",
2: "trades",
3: "tradesBlock",
4: "filtersBlockReplica" + topicSuffix,
5: "tradesReplica" + topicSuffix,
6: "tradesBlockReplica" + topicSuffix,
7: "tradesEstimation",
14: "filtersblockHistoricalDone",
21: "filtersblocktest",
22: "tradestest",
23: "tradesblocktest",
24: "nfttrades",
25: "nfttradestest",
}
result, ok := topicMap[topic]
if !ok {
log.Error("getTopic cant find topic", topic)
}
return result
}
func init() {
KafkaConfig.KafkaUrl = []string{os.Getenv("KAFKAURL")}
topicSuffix = utils.Getenv("KAFKA_TOPIC_SUFFIX", "")
}
// WithRetryOnError
func ReadOffset(topic int) (offset int64, err error) {
for _, ip := range KafkaConfig.KafkaUrl {
var conn *kafka.Conn
conn, err = kafka.DialLeader(context.Background(), "tcp", ip, getTopic(topic), 0)
if err != nil {
log.Errorln("ReadOffset conn error: <", err, "> ", ip)
} else {
offset, err = conn.ReadLastOffset()
if err != nil {
log.Errorln("ReadOffset ReadLastOffset error: <", err, "> ")
} else {
return
}
defer func() {
cerr := conn.Close()
if err == nil {
err = cerr
}
}()
}
}
return
}
func ReadOffsetWithRetryOnError(topic int) (offset int64) {
// TO DO: check double infinite for loops.
for {
for {
for _, ip := range KafkaConfig.KafkaUrl {
conn, err := kafka.DialLeader(context.Background(), "tcp", ip, getTopic(topic), 0)
if err != nil {
log.Errorln("ReadOffsetWithRetryOnError conn error: <", err, "> ", ip, " topic:", topic)
time.Sleep(retryDelay)
} else {
defer func() {
err = conn.Close()
if err != nil {
log.Error(err)
}
}()
offset, err = conn.ReadLastOffset()
if err != nil {
log.Errorln("ReadOffsetWithRetryOnError ReadLastOffset error: <", err, "> ", ip, " topic:", topic)
time.Sleep(retryDelay)
} else {
return offset
}
}
}
}
}
}
func NewWriter(topic int) *kafka.Writer {
return kafka.NewWriter(kafka.WriterConfig{
Brokers: KafkaConfig.KafkaUrl,
Topic: getTopic(topic),
Balancer: &kafka.LeastBytes{},
Async: true,
})
}
func NewSyncWriter(topic int) *kafka.Writer {
return kafka.NewWriter(kafka.WriterConfig{
Brokers: KafkaConfig.KafkaUrl,
Topic: getTopic(topic),
Balancer: &kafka.LeastBytes{},
Async: false,
BatchBytes: 1e9, // 1GB
})
}
func NewSyncWriterWithCompression(topic int) *kafka.Writer {
return kafka.NewWriter(kafka.WriterConfig{
Brokers: KafkaConfig.KafkaUrl,
Topic: getTopic(topic),
Balancer: &kafka.LeastBytes{},
Async: false,
BatchBytes: 1e9, // 1GB
CompressionCodec: &compress.GzipCodec,
})
}
func NewReader(topic int) *kafka.Reader {
r := kafka.NewReader(kafka.ReaderConfig{
Brokers: KafkaConfig.KafkaUrl,
Topic: getTopic(topic),
Partition: 0,
MinBytes: 0,
MaxBytes: 10e6, // 10MB
})
return r
}
func WriteMessage(w *kafka.Writer, m KafkaMessage) error {
key := []byte("helloKafka")
value, err := m.MarshalBinary()
if err == nil && value != nil {
err = w.WriteMessages(context.Background(),
kafka.Message{
Key: key,
Value: value,
},
)
if err != nil {
log.Errorln("WriteMessage error:", err, "sizeMessage:", float64(len(value))/(1024.0*1024.0), "MB")
}
} else {
log.Errorln("Skipping write of message ", err, m)
}
return err
}
func NewReaderXElementsBeforeLastMessage(topic int, x int64) *kafka.Reader {
var offset int64
o, err := ReadOffset(topic)
if err == nil && o-x > 0 {
offset = o - x
} else {
log.Warningf("err %v on readOffset on topic %v", err, topic)
}
log.Println("NewReaderXElementsBeforeLastMessage: setting offset ", offset, "/", o)
r := kafka.NewReader(kafka.ReaderConfig{
Brokers: KafkaConfig.KafkaUrl,
Topic: getTopic(topic),
Partition: 0,
MinBytes: 0,
MaxBytes: 10e6, // 10MB
})
err = r.SetOffset(offset)
if err != nil {
log.Error(err)
}
return r
}
func NewReaderNextMessage(topic int) *kafka.Reader {
offset := ReadOffsetWithRetryOnError(topic)
r := NewReader(topic)
err := r.SetOffset(offset)
if err != nil {
log.Error(err)
}
log.Printf("Reading from offset %d/%d on topic %s", offset, offset, getTopic(topic))
return r
}
func IsTopicEmpty(topic int) bool {
log.Println("IsTopicEmpty: ", topic)
offset := ReadOffsetWithRetryOnError(topic)
offset--
return offset < 0
}
func GetLastElementWithRetryOnError(topic int) interface{} {
for {
i, err := GetLastElement(topic)
if err == nil {
return i
}
time.Sleep(retryDelay)
log.Println("GetLastElementWithRetryOnError retrying...")
}
}
func GetLastElement(topic int) (interface{}, error) {
offset := ReadOffsetWithRetryOnError(topic)
offset--
if offset < 0 {
return nil, io.EOF
} else {
e, err := GetElements(topic, offset, 1)
if err == nil {
return e[0], nil
} else {
return nil, err
}
}
}
func GetElements(topic int, offset int64, nbElements int) ([]interface{}, error) {
var result []interface{}
var maxOffset = offset + int64(nbElements)
conn, err := kafka.DialLeader(context.Background(), "tcp", KafkaConfig.KafkaUrl[0], getTopic(topic), 0)
if err != nil {
log.Errorln("kafka error:", err)
return nil, err
} else {
newSeek, err := conn.Seek(int64(offset), kafka.SeekAbsolute)
if err != nil {
log.Errorln("kafka error on seek:", err)
return nil, err
}
log.Printf("kafka newSeek:%v", newSeek)
first, last, err := conn.ReadOffsets()
if err != nil {
return nil, err
}
log.Printf("kafka ReadOffsets:%v, %v", first, last)
batch := conn.ReadBatch(0, messageSizeMax*nbElements)
b := make([]byte, messageSizeMax)
for c := offset; c <= maxOffset; c++ {
z, err := batch.Read(b)
if err != nil {
log.Printf("error on batch read: %v", err)
return nil, err
}
b2 := b[:z]
switch topic {
case TopicFiltersBlock:
var e dia.FiltersBlock
err = e.UnmarshalBinary(b2)
if err == nil {
result = append(result, e)
}
case TopicTrades:
var e dia.Trade
err = e.UnmarshalBinary(b2)
if err == nil {
result = append(result, e)
}
case TopicTradesBlock:
var e dia.TradesBlock
err = e.UnmarshalBinary(b2)
if err == nil {
result = append(result, e)
}
default:
return nil, errors.New("missing case unknown topic in switch... function GetElements / Kafka.go")
}
if err != nil {
errorMsg := fmt.Sprintf("parsing error while processing offset: %v/%v", c, maxOffset)
return nil, errors.New(errorMsg)
}
if len(result) == nbElements {
break
}
}
return result, nil
}
}