add filer notification

weed/msgqueue/kafka/kafka_queue.go

@@ -0,0 +1,76 @@
+package kafka
+
+import (
+	_ "github.com/go-sql-driver/mysql"
+	"github.com/chrislusf/seaweedfs/weed/msgqueue"
+	"github.com/golang/protobuf/proto"
+	"github.com/Shopify/sarama"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func init() {
+	msgqueue.MessageQueues = append(msgqueue.MessageQueues, &KafkaQueue{})
+}
+
+type KafkaQueue struct {
+	topic    string
+	producer sarama.AsyncProducer
+}
+
+func (k *KafkaQueue) GetName() string {
+	return "kafka"
+}
+
+func (k *KafkaQueue) Initialize(configuration msgqueue.Configuration) (err error) {
+	return k.initialize(
+		configuration.GetStringSlice("hosts"),
+		configuration.GetString("topic"),
+	)
+}
+
+func (k *KafkaQueue) initialize(hosts []string, topic string) (err error) {
+	config := sarama.NewConfig()
+	config.Producer.RequiredAcks = sarama.WaitForLocal
+	config.Producer.Partitioner = sarama.NewHashPartitioner
+	config.Producer.Return.Successes = true
+	config.Producer.Return.Errors = true
+	k.producer, err = sarama.NewAsyncProducer(hosts, config)
+	go k.handleSuccess()
+	go k.handleError()
+	return nil
+}
+
+func (k *KafkaQueue) SendMessage(key string, message proto.Message) (err error) {
+	bytes, err := proto.Marshal(message)
+	if err != nil {
+		return
+	}
+
+	msg := &sarama.ProducerMessage{
+		Topic: k.topic,
+		Key:   sarama.StringEncoder(key),
+		Value: sarama.ByteEncoder(bytes),
+	}
+
+	k.producer.Input() <- msg
+
+	return nil
+}
+
+func (k *KafkaQueue) handleSuccess() {
+	for {
+		pm := <-k.producer.Successes()
+		if pm != nil {
+			glog.Infof("producer message success, partition:%d offset:%d key:%v valus:%s", pm.Partition, pm.Offset, pm.Key, pm.Value)
+		}
+	}
+}
+
+func (k *KafkaQueue) handleError() {
+	for {
+		err := <-k.producer.Errors()
+		if err != nil {
+			glog.Errorf("producer message error, partition:%d offset:%d key:%v valus:%s error(%v)", err.Msg.Partition, err.Msg.Offset, err.Msg.Key, err.Msg.Value, err.Err)
+		}
+	}
+}