155 lines
3.4 KiB
Go
155 lines
3.4 KiB
Go
package kafka
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import (
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"crypto/tls"
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"fmt"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/outputs"
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"github.com/influxdata/telegraf/plugins/serializers"
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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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// 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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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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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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### Telegraf tag to use as a routing key
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### ie, if this tag exists, it's value will be used as the routing key
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routing_tag = "host"
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### Optional SSL Config
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# ssl_ca = "/etc/telegraf/ca.pem"
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# ssl_cert = "/etc/telegraf/cert.pem"
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# ssl_key = "/etc/telegraf/key.pem"
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### Use SSL but skip chain & host verification
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# insecure_skip_verify = false
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### Data format to output. This can be "influx" or "graphite"
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### Each data format has it's own unique set of configuration options, read
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### more about them here:
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### https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
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data_format = "influx"
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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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config := sarama.NewConfig()
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// Wait for all in-sync replicas to ack the message
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config.Producer.RequiredAcks = sarama.WaitForAll
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// Retry up to 10 times to produce the message
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config.Producer.Retry.Max = 10
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// Legacy support ssl config
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if k.Certificate != "" {
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k.SSLCert = k.Certificate
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k.SSLCA = k.CA
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k.SSLKey = k.Key
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}
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tlsConfig, err := internal.GetTLSConfig(
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k.SSLCert, k.SSLKey, k.SSLCA, k.InsecureSkipVerify)
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if err != nil {
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return err
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}
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if tlsConfig != nil {
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config.Net.TLS.Config = tlsConfig
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config.Net.TLS.Enable = true
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}
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producer, err := sarama.NewSyncProducer(k.Brokers, config)
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if err != nil {
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return err
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}
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k.producer = producer
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return nil
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}
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func (k *Kafka) Close() error {
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return k.producer.Close()
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}
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func (k *Kafka) SampleConfig() string {
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return sampleConfig
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}
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func (k *Kafka) Description() string {
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return "Configuration for the Kafka server to send metrics to"
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}
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func (k *Kafka) Write(metrics []telegraf.Metric) error {
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if len(metrics) == 0 {
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return nil
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}
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for _, metric := range metrics {
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values, err := k.serializer.Serialize(metric)
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if err != nil {
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return err
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}
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var pubErr error
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for _, value := range values {
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m := &sarama.ProducerMessage{
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Topic: k.Topic,
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Value: sarama.StringEncoder(value),
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}
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if h, ok := metric.Tags()[k.RoutingTag]; ok {
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m.Key = sarama.StringEncoder(h)
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}
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_, _, pubErr = k.producer.SendMessage(m)
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}
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if pubErr != nil {
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return fmt.Errorf("FAILED to send kafka message: %s\n", pubErr)
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}
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}
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return nil
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}
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func init() {
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outputs.Add("kafka", func() telegraf.Output {
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return &Kafka{}
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})
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}
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