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102 lines
3 KiB
Go
102 lines
3 KiB
Go
package sub_coordinator
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import (
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cmap "github.com/orcaman/concurrent-map/v2"
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"github.com/seaweedfs/seaweedfs/weed/mq/pub_balancer"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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)
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type TopicConsumerGroups struct {
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// map a consumer group name to a consumer group
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ConsumerGroups cmap.ConcurrentMap[string, *ConsumerGroup]
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}
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// Coordinator coordinates the instances in the consumer group for one topic.
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// It is responsible for:
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// 1. (Maybe) assigning partitions when a consumer instance is up/down.
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type Coordinator struct {
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// map topic name to consumer groups
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TopicSubscribers cmap.ConcurrentMap[string, *TopicConsumerGroups]
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balancer *pub_balancer.Balancer
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}
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func NewCoordinator(balancer *pub_balancer.Balancer) *Coordinator {
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return &Coordinator{
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TopicSubscribers: cmap.New[*TopicConsumerGroups](),
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balancer: balancer,
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}
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}
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func (c *Coordinator) GetTopicConsumerGroups(topic *mq_pb.Topic, createIfMissing bool) *TopicConsumerGroups {
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topicName := toTopicName(topic)
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tcg, _ := c.TopicSubscribers.Get(topicName)
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if tcg == nil && createIfMissing{
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tcg = &TopicConsumerGroups{
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ConsumerGroups: cmap.New[*ConsumerGroup](),
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}
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if !c.TopicSubscribers.SetIfAbsent(topicName, tcg) {
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tcg, _ = c.TopicSubscribers.Get(topicName)
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}
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}
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return tcg
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}
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func (c *Coordinator) RemoveTopic(topic *mq_pb.Topic) {
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topicName := toTopicName(topic)
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c.TopicSubscribers.Remove(topicName)
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}
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func toTopicName(topic *mq_pb.Topic) string {
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topicName := topic.Namespace + "." + topic.Name
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return topicName
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}
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func (c *Coordinator) AddSubscriber(consumerGroup, consumerGroupInstance string, topic *mq_pb.Topic) *ConsumerGroupInstance {
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tcg := c.GetTopicConsumerGroups(topic, true)
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cg, _ := tcg.ConsumerGroups.Get(consumerGroup)
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if cg == nil {
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cg = NewConsumerGroup(topic, c.balancer)
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if !tcg.ConsumerGroups.SetIfAbsent(consumerGroup, cg){
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cg, _ = tcg.ConsumerGroups.Get(consumerGroup)
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}
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}
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cgi, _ := cg.ConsumerGroupInstances.Get(consumerGroupInstance)
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if cgi == nil {
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cgi = NewConsumerGroupInstance(consumerGroupInstance)
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if !cg.ConsumerGroupInstances.SetIfAbsent(consumerGroupInstance, cgi){
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cgi, _ = cg.ConsumerGroupInstances.Get(consumerGroupInstance)
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}
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}
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cg.OnAddConsumerGroupInstance(consumerGroupInstance, topic)
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return cgi
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}
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func (c *Coordinator) RemoveSubscriber(consumerGroup, consumerGroupInstance string, topic *mq_pb.Topic) {
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tcg := c.GetTopicConsumerGroups(topic, false)
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if tcg == nil {
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return
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}
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cg, _ := tcg.ConsumerGroups.Get(consumerGroup)
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if cg == nil {
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return
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}
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cg.ConsumerGroupInstances.Remove(consumerGroupInstance)
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cg.OnRemoveConsumerGroupInstance(consumerGroupInstance, topic)
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if cg.ConsumerGroupInstances.Count() == 0 {
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tcg.ConsumerGroups.Remove(consumerGroup)
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}
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if tcg.ConsumerGroups.Count() == 0 {
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c.RemoveTopic(topic)
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}
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}
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func (c *Coordinator) OnPartitionChange(topic *mq_pb.Topic, assignments []*mq_pb.BrokerPartitionAssignment) {
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tcg, _ := c.TopicSubscribers.Get(toTopicName(topic))
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if tcg == nil {
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return
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}
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for _, cg := range tcg.ConsumerGroups.Items() {
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cg.OnPartitionListChange(assignments)
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}
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}
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