mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-12-06 04:29:02 +08:00
159 lines
4.0 KiB
Go
159 lines
4.0 KiB
Go
package replication
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import (
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"fmt"
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"github.com/Shopify/sarama"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/golang/protobuf/proto"
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"io/ioutil"
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"encoding/json"
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"sync"
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"time"
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)
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func init() {
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NotificationInputs = append(NotificationInputs, &KafkaInput{})
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}
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type KafkaInput struct {
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topic string
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consumer sarama.Consumer
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messageChan chan *sarama.ConsumerMessage
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}
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func (k *KafkaInput) GetName() string {
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return "kafka"
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}
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func (k *KafkaInput) Initialize(configuration util.Configuration) error {
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glog.V(0).Infof("replication.notification.kafka.hosts: %v\n", configuration.GetStringSlice("hosts"))
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glog.V(0).Infof("replication.notification.kafka.topic: %v\n", configuration.GetString("topic"))
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return k.initialize(
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configuration.GetStringSlice("hosts"),
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configuration.GetString("topic"),
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configuration.GetString("offsetFile"),
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configuration.GetInt("offsetSaveIntervalSeconds"),
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)
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}
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func (k *KafkaInput) initialize(hosts []string, topic string, offsetFile string, offsetSaveIntervalSeconds int) (err error) {
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config := sarama.NewConfig()
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config.Consumer.Return.Errors = true
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k.consumer, err = sarama.NewConsumer(hosts, config)
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if err != nil {
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panic(err)
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} else {
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glog.V(0).Infof("connected to %v", hosts)
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}
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k.topic = topic
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k.messageChan = make(chan *sarama.ConsumerMessage, 1)
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partitions, err := k.consumer.Partitions(topic)
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if err != nil {
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panic(err)
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}
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progress := loadProgress(offsetFile)
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if progress == nil || progress.Topic != topic {
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progress = &KafkaProgress{
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Topic: topic,
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PartitionOffsets: make(map[int32]int64),
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}
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}
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progress.lastSaveTime = time.Now()
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progress.offsetFile = offsetFile
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progress.offsetSaveIntervalSeconds = offsetSaveIntervalSeconds
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for _, partition := range partitions {
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offset, found := progress.PartitionOffsets[partition]
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if !found {
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offset = sarama.OffsetOldest
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} else {
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offset += 1
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}
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partitionConsumer, err := k.consumer.ConsumePartition(topic, partition, offset)
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if err != nil {
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panic(err)
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}
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go func() {
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for {
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select {
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case err := <-partitionConsumer.Errors():
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fmt.Println(err)
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case msg := <-partitionConsumer.Messages():
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k.messageChan <- msg
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if err := progress.setOffset(msg.Partition, msg.Offset); err != nil {
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glog.Warningf("set kafka offset: %v", err)
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}
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}
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}
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}()
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}
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return nil
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}
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func (k *KafkaInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, err error) {
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msg := <-k.messageChan
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key = string(msg.Key)
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message = &filer_pb.EventNotification{}
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err = proto.Unmarshal(msg.Value, message)
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return
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}
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type KafkaProgress struct {
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Topic string `json:"topic"`
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PartitionOffsets map[int32]int64 `json:"partitionOffsets"`
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offsetFile string
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lastSaveTime time.Time
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offsetSaveIntervalSeconds int
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sync.Mutex
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}
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func loadProgress(offsetFile string) *KafkaProgress {
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progress := &KafkaProgress{}
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data, err := ioutil.ReadFile(offsetFile)
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if err != nil {
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glog.Warningf("failed to read kafka progress file: %s", offsetFile)
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return nil
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}
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err = json.Unmarshal(data, progress)
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if err != nil {
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glog.Warningf("failed to read kafka progress message: %s", string(data))
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return nil
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}
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return progress
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}
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func (progress *KafkaProgress) saveProgress() error {
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data, err := json.Marshal(progress)
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if err != nil {
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return fmt.Errorf("failed to marshal progress: %v", err)
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}
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err = ioutil.WriteFile(progress.offsetFile, data, 0640)
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if err != nil {
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return fmt.Errorf("failed to save progress to %s: %v", progress.offsetFile, err)
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}
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progress.lastSaveTime = time.Now()
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return nil
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}
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func (progress *KafkaProgress) setOffset(parition int32, offset int64) error {
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progress.Lock()
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defer progress.Unlock()
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progress.PartitionOffsets[parition] = offset
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if int(time.Now().Sub(progress.lastSaveTime).Seconds()) > progress.offsetSaveIntervalSeconds {
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return progress.saveProgress()
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}
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return nil
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}
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