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consumer_group.go
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consumer_group.go
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/*
* Copyright 2021 The Knative Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kafka
import (
"context"
"fmt"
"github.com/IBM/sarama"
"knative.dev/eventing-kafka-broker/control-plane/pkg/kafka/offset"
)
// InitOffsetsFunc initialize offsets for a provided set of topics and a provided consumer group id.
type InitOffsetsFunc func(ctx context.Context, kafkaClient sarama.Client, kafkaAdminClient sarama.ClusterAdmin, topics []string, consumerGroup string) (int32, error)
var (
_ InitOffsetsFunc = offset.InitOffsets
)
const (
GroupIdAnnotation = "group.id"
)
func AreConsumerGroupsPresentAndValid(kafkaClusterAdmin sarama.ClusterAdmin, consumerGroups ...string) (bool, error) {
if len(consumerGroups) == 0 {
return false, fmt.Errorf("expected at least one consumergroup, got 0")
}
consumerGroupDescription, err := kafkaClusterAdmin.DescribeConsumerGroups(consumerGroups)
if err != nil {
return false, fmt.Errorf("failed to describe consumer groups %v: %w", consumerGroups, err)
}
descriptionByConsumerGroup := make(map[string]*sarama.GroupDescription, len(consumerGroupDescription))
for _, d := range consumerGroupDescription {
descriptionByConsumerGroup[d.GroupId] = d
}
for _, t := range consumerGroups {
d, ok := descriptionByConsumerGroup[t]
if !ok {
return false, fmt.Errorf("kafka did not respond with consumer group metadata")
}
if !isValidSingleConsumerGroup(d) {
return false, nil
}
}
return true, nil
}
func isValidSingleConsumerGroup(metadata *sarama.GroupDescription) bool {
if metadata == nil {
return false
}
if metadata.State == "Dead" {
return false
}
return true
}