open-im-server/pkg/common/kafka/producer.go

package kafka

import (
	"Open_IM/pkg/common/config"
	log "Open_IM/pkg/common/log"
	"Open_IM/pkg/utils"
	"errors"

	"github.com/Shopify/sarama"
	"github.com/golang/protobuf/proto"

	promePkg "Open_IM/pkg/common/prometheus"
)

type Producer struct {
	topic    string
	addr     []string
	config   *sarama.Config
	producer sarama.SyncProducer
}

func NewKafkaProducer(addr []string, topic string) *Producer {
	p := Producer{}
	p.config = sarama.NewConfig()             //Instantiate a sarama Config
	p.config.Producer.Return.Successes = true //Whether to enable the successes channel to be notified after the message is sent successfully
	p.config.Producer.Return.Errors = true
	p.config.Producer.RequiredAcks = sarama.WaitForAll        //Set producer Message Reply level 0 1 all
	p.config.Producer.Partitioner = sarama.NewHashPartitioner //Set the hash-key automatic hash partition. When sending a message, you must specify the key value of the message. If there is no key, the partition will be selected randomly
	if config.Config.Kafka.SASLUserName != "" && config.Config.Kafka.SASLPassword != "" {
		p.config.Net.SASL.Enable = true
		p.config.Net.SASL.User = config.Config.Kafka.SASLUserName
		p.config.Net.SASL.Password = config.Config.Kafka.SASLPassword
	}
	p.addr = addr
	p.topic = topic

	producer, err := sarama.NewSyncProducer(p.addr, p.config) //Initialize the client
	if err != nil {
		panic(err.Error())
		return nil
	}
	p.producer = producer
	return &p
}

func (p *Producer) SendMessage(m proto.Message, key string, operationID string) (int32, int64, error) {
	log.Info(operationID, "SendMessage", "key ", key, m.String(), p.producer)
	kMsg := &sarama.ProducerMessage{}
	kMsg.Topic = p.topic
	kMsg.Key = sarama.StringEncoder(key)
	bMsg, err := proto.Marshal(m)
	if err != nil {
		log.Error(operationID, "", "proto marshal err = %s", err.Error())
		return -1, -1, err
	}
	if len(bMsg) == 0 {
		log.Error(operationID, "len(bMsg) == 0 ")
		return 0, 0, errors.New("len(bMsg) == 0 ")
	}
	kMsg.Value = sarama.ByteEncoder(bMsg)
	log.Info(operationID, "ByteEncoder SendMessage begin", "key ", kMsg, p.producer, "len: ", kMsg.Key.Length(), kMsg.Value.Length())
	if kMsg.Key.Length() == 0 || kMsg.Value.Length() == 0 {
		log.Error(operationID, "kMsg.Key.Length() == 0 || kMsg.Value.Length() == 0 ", kMsg)
		return -1, -1, errors.New("key or value == 0")
	}
	a, b, c := p.producer.SendMessage(kMsg)
	log.Info(operationID, "ByteEncoder SendMessage end", "key ", kMsg.Key.Length(), kMsg.Value.Length(), p.producer)
	if c == nil {
		promePkg.PromeInc(promePkg.SendMsgCounter)
	}
	return a, b, utils.Wrap(c, "")
}