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package sub
import (
"encoding/json"
"fmt"
"io/ioutil"
"sync"
"time"
"github.com/Shopify/sarama"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/golang/protobuf/proto"
)
func init() {
NotificationInputs = append(NotificationInputs, &KafkaInput{})
}
type KafkaInput struct {
topic string
consumer sarama.Consumer
messageChan chan *sarama.ConsumerMessage
}
func (k *KafkaInput) GetName() string {
return "kafka"
}
func (k *KafkaInput) Initialize(configuration util.Configuration, prefix string) error {
glog.V(0).Infof("replication.notification.kafka.hosts: %v\n", configuration.GetStringSlice(prefix+"hosts"))
glog.V(0).Infof("replication.notification.kafka.topic: %v\n", configuration.GetString(prefix+"topic"))
return k.initialize(
configuration.GetStringSlice(prefix+"hosts"),
configuration.GetString(prefix+"topic"),
configuration.GetString(prefix+"offsetFile"),
configuration.GetInt(prefix+"offsetSaveIntervalSeconds"),
)
}
func (k *KafkaInput) initialize(hosts []string, topic string, offsetFile string, offsetSaveIntervalSeconds int) (err error) {
config := sarama.NewConfig()
config.Consumer.Return.Errors = true
k.consumer, err = sarama.NewConsumer(hosts, config)
if err != nil {
panic(err)
} else {
glog.V(0).Infof("connected to %v", hosts)
}
k.topic = topic
k.messageChan = make(chan *sarama.ConsumerMessage, 1)
partitions, err := k.consumer.Partitions(topic)
if err != nil {
panic(err)
}
progress := loadProgress(offsetFile)
if progress == nil || progress.Topic != topic {
progress = &KafkaProgress{
Topic: topic,
PartitionOffsets: make(map[int32]int64),
}
}
progress.lastSaveTime = time.Now()
progress.offsetFile = offsetFile
progress.offsetSaveIntervalSeconds = offsetSaveIntervalSeconds
for _, partition := range partitions {
offset, found := progress.PartitionOffsets[partition]
if !found {
offset = sarama.OffsetOldest
} else {
offset += 1
}
partitionConsumer, err := k.consumer.ConsumePartition(topic, partition, offset)
if err != nil {
panic(err)
}
go func() {
for {
select {
case err := <-partitionConsumer.Errors():
fmt.Println(err)
case msg := <-partitionConsumer.Messages():
k.messageChan <- msg
if err := progress.setOffset(msg.Partition, msg.Offset); err != nil {
glog.Warningf("set kafka offset: %v", err)
}
}
}
}()
}
return nil
}
func (k *KafkaInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, onSuccessFn func(), onFailureFn func(), err error) {
msg := <-k.messageChan
key = string(msg.Key)
message = &filer_pb.EventNotification{}
err = proto.Unmarshal(msg.Value, message)
return
}
type KafkaProgress struct {
Topic string `json:"topic"`
PartitionOffsets map[int32]int64 `json:"partitionOffsets"`
offsetFile string
lastSaveTime time.Time
offsetSaveIntervalSeconds int
sync.Mutex
}
func loadProgress(offsetFile string) *KafkaProgress {
progress := &KafkaProgress{}
data, err := ioutil.ReadFile(offsetFile)
if err != nil {
glog.Warningf("failed to read kafka progress file: %s", offsetFile)
return nil
}
err = json.Unmarshal(data, progress)
if err != nil {
glog.Warningf("failed to read kafka progress message: %s", string(data))
return nil
}
return progress
}
func (progress *KafkaProgress) saveProgress() error {
data, err := json.Marshal(progress)
if err != nil {
return fmt.Errorf("failed to marshal progress: %v", err)
}
err = ioutil.WriteFile(progress.offsetFile, data, 0640)
if err != nil {
return fmt.Errorf("failed to save progress to %s: %v", progress.offsetFile, err)
}
progress.lastSaveTime = time.Now()
return nil
}
func (progress *KafkaProgress) setOffset(parition int32, offset int64) error {
progress.Lock()
defer progress.Unlock()
progress.PartitionOffsets[parition] = offset
if int(time.Now().Sub(progress.lastSaveTime).Seconds()) > progress.offsetSaveIntervalSeconds {
return progress.saveProgress()
}
return nil
}
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