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kafkaConfig.go
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kafkaConfig.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package messaging
import (
"fmt"
)
type (
// KafkaConfig describes the configuration needed to connect to all kafka clusters
KafkaConfig struct {
Clusters map[string]ClusterConfig `yaml:"clusters"`
Topics map[string]TopicConfig `yaml:"topics"`
ClusterToTopic map[string]TopicList `yaml:"cadence-cluster-topics"`
}
// ClusterConfig describes the configuration for a single Kafka cluster
ClusterConfig struct {
Brokers []string `yaml:"brokers"`
}
// TopicConfig describes the mapping from topic to Kafka cluster
TopicConfig struct {
Cluster string `yaml:"cluster"`
}
// TopicList describes the topic names for each cluster
TopicList struct {
Topic string `yaml:"topic"`
RetryTopic string `yaml:"retry-topic"`
DLQTopic string `yaml:"dlq-topic"`
}
)
// Validate will validate config
func (k *KafkaConfig) Validate() {
if len(k.Clusters) == 0 {
panic("Empty Kafka Cluster Config")
}
if len(k.Topics) == 0 {
panic("Empty Topics Config")
}
if len(k.ClusterToTopic) == 0 {
panic("Empty Cluster To Topics Config")
}
validateTopicsFn := func(topic string) {
if topic == "" {
panic("Empty Topic Name")
} else if topicConfig, ok := k.Topics[topic]; !ok {
panic(fmt.Sprintf("Missing Topic Config for Topic %v", topic))
} else if clusterConfig, ok := k.Clusters[topicConfig.Cluster]; !ok {
panic(fmt.Sprintf("Missing Kafka Cluster Config for Cluster %v", topicConfig.Cluster))
} else if len(clusterConfig.Brokers) == 0 {
panic(fmt.Sprintf("Missing Kafka Brokers Config for Cluster %v", topicConfig.Cluster))
}
}
for _, topics := range k.ClusterToTopic {
validateTopicsFn(topics.Topic)
validateTopicsFn(topics.RetryTopic)
validateTopicsFn(topics.DLQTopic)
}
}
func (k *KafkaConfig) getTopicsForCadenceCluster(cadenceCluster string) TopicList {
return k.ClusterToTopic[cadenceCluster]
}
func (k *KafkaConfig) getKafkaClusterForTopic(topic string) string {
return k.Topics[topic].Cluster
}
func (k *KafkaConfig) getBrokersForKafkaCluster(kafkaCluster string) []string {
return k.Clusters[kafkaCluster].Brokers
}