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kafka.go
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kafka.go
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package mq
import (
"context"
"log"
"strings"
"time"
"github.com/matt-abi/abi-lib/dynamic"
"github.com/matt-abi/abi-lib/json"
kafka "github.com/segmentio/kafka-go"
)
type kafkaConfig struct {
Addr string `json:"addr"`
Topic string `json:"topic"`
Partition int `json:"partition"`
MinBytes int `json:"min-bytes"`
MaxBytes int `json:"max-bytes"`
}
type kafkaDriver struct {
config kafkaConfig
conn *kafka.Conn
}
func newKafkaDriver(driver string, config interface{}) (Driver, error) {
v := &kafkaDriver{}
dynamic.SetValue(&v.config, config)
conn, err := kafka.Dial("tcp", v.config.Addr)
if err != nil {
return nil, err
}
v.conn = conn
return v, nil
}
func (k *kafkaDriver) Send(topic string, name string, data interface{}) error {
b, _ := json.Marshal(map[string]interface{}{"name": name, "data": data})
_, err := k.conn.WriteMessages(&kafka.Message{Value: b, Topic: topic})
return err
}
func (k *kafkaDriver) On(queue string, fn func(name string, data interface{}) bool) context.CancelFunc {
ctx, cancel := context.WithCancel(context.Background())
vs := strings.Split(queue, "/")
groupId := ""
topic := vs[0]
if len(vs) > 1 {
groupId = vs[1]
}
r := kafka.NewReader(kafka.ReaderConfig{
Brokers: []string{k.config.Addr},
GroupID: groupId,
Topic: topic,
MinBytes: k.config.MinBytes, // 10KB
MaxBytes: k.config.MaxBytes, // 10MB
})
done := func() error {
m, err := r.FetchMessage(ctx)
if err != nil {
return err
}
var data interface{} = nil
err = json.Unmarshal(m.Value, &data)
if err != nil {
log.Println("[kafka]", "[err:1]", err)
return nil
} else {
name := dynamic.StringValue(dynamic.Get(data, "name"), "")
if name != "" {
err = fn(name, dynamic.Get(data, "data"))
if err != nil {
return err
}
err = r.CommitMessages(ctx, m)
if err != nil {
return err
}
}
}
return nil
}
go func() {
tk := time.NewTicker(30 * time.Second)
defer tk.Stop()
running := true
for running {
err := done()
if err != nil {
log.Println("[kafka]", "[err:1]", err, "Wait 30 seconds and try again")
select {
case <-ctx.Done():
running = false
case <-tk.C:
}
} else {
select {
case <-ctx.Done():
running = false
default:
}
}
}
}()
return cancel
}
func (k *kafkaDriver) Recycle() {
if k.conn != nil {
k.conn.Close()
k.conn = nil
}
}
func init() {
Reg("kafka", newKafkaDriver)
}