Add Kafka output plugin topic_suffix option (#3196)
This commit is contained in:
Pavel Gurkov
Daniel Nelson
parent
ab1c11b06d
commit
5d4eec606f
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@ -8,6 +8,34 @@ This plugin writes to a [Kafka Broker](http://kafka.apache.org/07/quickstart.htm
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brokers = ["localhost:9092"]
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## Kafka topic for producer messages
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topic = "telegraf"
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## Optional topic suffix configuration.
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## If the section is omitted, no suffix is used.
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## Following topic suffix methods are supported:
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## measurement - suffix equals to separator + measurement's name
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## tags - suffix equals to separator + specified tags' values
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## interleaved with separator
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## Suffix equals to "_" + measurement's name
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# [outputs.kafka.topic_suffix]
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# method = "measurement"
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# separator = "_"
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## Suffix equals to "__" + measurement's "foo" tag value.
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## If there's no such a tag, suffix equals to an empty string
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# [outputs.kafka.topic_suffix]
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# method = "tags"
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# keys = ["foo"]
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# separator = "__"
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## Suffix equals to "_" + measurement's "foo" and "bar"
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## tag values, separated by "_". If there is no such tags,
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## their values treated as empty strings.
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# [outputs.kafka.topic_suffix]
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# method = "tags"
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# keys = ["foo", "bar"]
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# separator = "_"
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## Telegraf tag to use as a routing key
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## ie, if this tag exists, its value will be used as the routing key
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routing_tag = "host"
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@ -57,10 +85,9 @@ This plugin writes to a [Kafka Broker](http://kafka.apache.org/07/quickstart.htm
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* `brokers`: List of strings, this is for speaking to a cluster of `kafka` brokers. On each flush interval, Telegraf will randomly choose one of the urls to write to. Each URL should just include host and port e.g. -> `["{host}:{port}","{host2}:{port2}"]`
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* `topic`: The `kafka` topic to publish to.
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### Optional parameters:
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* `routing_tag`: if this tag exists, its value will be used as the routing key
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* `routing_tag`: If this tag exists, its value will be used as the routing key
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* `compression_codec`: What level of compression to use: `0` -> no compression, `1` -> gzip compression, `2` -> snappy compression
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* `required_acks`: a setting for how may `acks` required from the `kafka` broker cluster.
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* `max_retry`: Max number of times to retry failed write
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@ -69,3 +96,5 @@ This plugin writes to a [Kafka Broker](http://kafka.apache.org/07/quickstart.htm
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* `ssl_key`: SSL key
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* `insecure_skip_verify`: Use SSL but skip chain & host verification (default: false)
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* `data_format`: [About Telegraf data formats](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md)
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* `topic_suffix`: Which, if any, method of calculating `kafka` topic suffix to use.
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For examples, please refer to sample configuration.
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@ -3,6 +3,7 @@ package kafka
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import (
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"crypto/tls"
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"fmt"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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@ -12,54 +13,97 @@ import (
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"github.com/Shopify/sarama"
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)
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type Kafka struct {
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// Kafka brokers to send metrics to
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Brokers []string
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// Kafka topic
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Topic string
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// Routing Key Tag
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RoutingTag string `toml:"routing_tag"`
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// Compression Codec Tag
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CompressionCodec int
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// RequiredAcks Tag
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RequiredAcks int
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// MaxRetry Tag
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MaxRetry int
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// Legacy SSL config options
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// TLS client certificate
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Certificate string
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// TLS client key
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Key string
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// TLS certificate authority
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CA string
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// Path to CA file
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SSLCA string `toml:"ssl_ca"`
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// Path to host cert file
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SSLCert string `toml:"ssl_cert"`
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// Path to cert key file
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SSLKey string `toml:"ssl_key"`
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// Skip SSL verification
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InsecureSkipVerify bool
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// SASL Username
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SASLUsername string `toml:"sasl_username"`
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// SASL Password
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SASLPassword string `toml:"sasl_password"`
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tlsConfig tls.Config
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producer sarama.SyncProducer
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serializer serializers.Serializer
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var ValidTopicSuffixMethods = []string{
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"",
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"measurement",
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"tags",
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}
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type (
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Kafka struct {
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// Kafka brokers to send metrics to
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Brokers []string
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// Kafka topic
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Topic string
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// Kafka topic suffix option
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TopicSuffix TopicSuffix `toml:"topic_suffix"`
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// Routing Key Tag
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RoutingTag string `toml:"routing_tag"`
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// Compression Codec Tag
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CompressionCodec int
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// RequiredAcks Tag
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RequiredAcks int
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// MaxRetry Tag
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MaxRetry int
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// Legacy SSL config options
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// TLS client certificate
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Certificate string
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// TLS client key
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Key string
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// TLS certificate authority
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CA string
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// Path to CA file
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SSLCA string `toml:"ssl_ca"`
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// Path to host cert file
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SSLCert string `toml:"ssl_cert"`
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// Path to cert key file
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SSLKey string `toml:"ssl_key"`
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// Skip SSL verification
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InsecureSkipVerify bool
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// SASL Username
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SASLUsername string `toml:"sasl_username"`
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// SASL Password
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SASLPassword string `toml:"sasl_password"`
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tlsConfig tls.Config
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producer sarama.SyncProducer
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serializer serializers.Serializer
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}
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TopicSuffix struct {
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Method string `toml:"method"`
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Keys []string `toml:"keys"`
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Separator string `toml:"separator"`
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}
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)
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var sampleConfig = `
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## URLs of kafka brokers
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brokers = ["localhost:9092"]
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## Kafka topic for producer messages
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topic = "telegraf"
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## Optional topic suffix configuration.
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## If the section is omitted, no suffix is used.
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## Following topic suffix methods are supported:
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## measurement - suffix equals to separator + measurement's name
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## tags - suffix equals to separator + specified tags' values
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## interleaved with separator
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## Suffix equals to "_" + measurement name
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# [outputs.kafka.topic_suffix]
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# method = "measurement"
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# separator = "_"
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## Suffix equals to "__" + measurement's "foo" tag value.
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## If there's no such a tag, suffix equals to an empty string
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# [outputs.kafka.topic_suffix]
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# method = "tags"
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# keys = ["foo"]
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# separator = "__"
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## Suffix equals to "_" + measurement's "foo" and "bar"
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## tag values, separated by "_". If there is no such tags,
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## their values treated as empty strings.
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# [outputs.kafka.topic_suffix]
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# method = "tags"
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# keys = ["foo", "bar"]
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# separator = "_"
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## Telegraf tag to use as a routing key
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## ie, if this tag exists, its value will be used as the routing key
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routing_tag = "host"
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@ -108,11 +152,45 @@ var sampleConfig = `
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data_format = "influx"
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`
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func ValidateTopicSuffixMethod(method string) error {
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for _, validMethod := range ValidTopicSuffixMethods {
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if method == validMethod {
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return nil
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}
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}
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return fmt.Errorf("Unkown topic suffix method provided: %s", method)
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}
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func (k *Kafka) GetTopicName(metric telegraf.Metric) string {
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var topicName string
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switch k.TopicSuffix.Method {
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case "measurement":
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topicName = k.Topic + k.TopicSuffix.Separator + metric.Name()
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case "tags":
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var topicNameComponents []string
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topicNameComponents = append(topicNameComponents, k.Topic)
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for _, tag := range k.TopicSuffix.Keys {
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tagValue := metric.Tags()[tag]
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if tagValue != "" {
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topicNameComponents = append(topicNameComponents, tagValue)
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}
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}
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topicName = strings.Join(topicNameComponents, k.TopicSuffix.Separator)
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default:
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topicName = k.Topic
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}
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return topicName
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}
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func (k *Kafka) SetSerializer(serializer serializers.Serializer) {
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k.serializer = serializer
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}
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func (k *Kafka) Connect() error {
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err := ValidateTopicSuffixMethod(k.TopicSuffix.Method)
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if err != nil {
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return err
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}
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config := sarama.NewConfig()
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config.Producer.RequiredAcks = sarama.RequiredAcks(k.RequiredAcks)
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@ -175,8 +253,10 @@ func (k *Kafka) Write(metrics []telegraf.Metric) error {
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return err
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}
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topicName := k.GetTopicName(metric)
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m := &sarama.ProducerMessage{
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Topic: k.Topic,
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Topic: topicName,
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Value: sarama.ByteEncoder(buf),
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}
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if h, ok := metric.Tags()[k.RoutingTag]; ok {
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@ -8,6 +8,11 @@ import (
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"github.com/stretchr/testify/require"
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)
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type topicSuffixTestpair struct {
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topicSuffix TopicSuffix
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expectedTopic string
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}
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func TestConnectAndWrite(t *testing.T) {
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if testing.Short() {
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t.Skip("Skipping integration test in short mode")
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@ -28,4 +33,66 @@ func TestConnectAndWrite(t *testing.T) {
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// Verify that we can successfully write data to the kafka broker
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err = k.Write(testutil.MockMetrics())
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require.NoError(t, err)
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k.Close()
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}
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func TestTopicSuffixes(t *testing.T) {
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if testing.Short() {
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t.Skip("Skipping integration test in short mode")
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}
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topic := "Test"
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metric := testutil.TestMetric(1)
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metricTagName := "tag1"
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metricTagValue := metric.Tags()[metricTagName]
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metricName := metric.Name()
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var testcases = []topicSuffixTestpair{
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// This ensures empty separator is okay
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{TopicSuffix{Method: "measurement"},
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topic + metricName},
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{TopicSuffix{Method: "measurement", Separator: "sep"},
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topic + "sep" + metricName},
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{TopicSuffix{Method: "tags", Keys: []string{metricTagName}, Separator: "_"},
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topic + "_" + metricTagValue},
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{TopicSuffix{Method: "tags", Keys: []string{metricTagName, metricTagName, metricTagName}, Separator: "___"},
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topic + "___" + metricTagValue + "___" + metricTagValue + "___" + metricTagValue},
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{TopicSuffix{Method: "tags", Keys: []string{metricTagName, metricTagName, metricTagName}},
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topic + metricTagValue + metricTagValue + metricTagValue},
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// This ensures non-existing tags are ignored
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{TopicSuffix{Method: "tags", Keys: []string{"non_existing_tag", "non_existing_tag"}, Separator: "___"},
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topic},
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{TopicSuffix{Method: "tags", Keys: []string{metricTagName, "non_existing_tag"}, Separator: "___"},
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topic + "___" + metricTagValue},
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// This ensures backward compatibility
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{TopicSuffix{},
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topic},
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}
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for _, testcase := range testcases {
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topicSuffix := testcase.topicSuffix
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expectedTopic := testcase.expectedTopic
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k := &Kafka{
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Topic: topic,
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TopicSuffix: topicSuffix,
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}
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topic := k.GetTopicName(metric)
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require.Equal(t, expectedTopic, topic)
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}
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}
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func TestValidateTopicSuffixMethod(t *testing.T) {
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if testing.Short() {
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t.Skip("Skipping integration test in short mode")
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}
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err := ValidateTopicSuffixMethod("invalid_topic_suffix_method")
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require.Error(t, err, "Topic suffix method used should be invalid.")
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for _, method := range ValidTopicSuffixMethods {
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err := ValidateTopicSuffixMethod(method)
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require.NoError(t, err, "Topic suffix method used should be valid.")
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}
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}
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