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callbacks.go
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callbacks.go
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package callback
import (
"time"
"github.com/lavkesh/kafqa/serde"
"github.com/lavkesh/kafqa/logger"
"github.com/lavkesh/kafqa/reporter"
"github.com/lavkesh/kafqa/reporter/metrics"
"github.com/lavkesh/kafqa/store"
"gopkg.in/confluentinc/confluent-kafka-go.v1/kafka"
)
type Callback func(*kafka.Message)
type acknowledger interface {
Acknowledge(store.Trace) error
}
func Acker(ack acknowledger, decoder serde.Decoder) Callback {
return func(msg *kafka.Message) {
message, err := decoder.FromBytes(msg.Value)
if err != nil {
logger.Errorf("Unable to decode message during consumer ack %s", err.Error())
} else {
err := ack.Acknowledge(store.Trace{Message: message, TopicPartition: msg.TopicPartition})
if err != nil {
logger.Debugf("Unable to acknowledge message: %s", message)
}
metrics.AcknowledgedMessage(message, *msg.TopicPartition.Topic)
metrics.ConsumerLatency(time.Since(message.CreatedTime))
}
}
}
func Reporter(decoder serde.Decoder) Callback {
return func(msg *kafka.Message) {
message, err := decoder.FromBytes(msg.Value)
if err != nil {
logger.Debugf("Unable to decode message during message sent callback")
} else {
metrics.SentMessage(message)
metrics.ProduceLatency(time.Since(message.CreatedTime))
}
}
}
func LatencyTracker(decoder serde.Decoder) Callback {
return func(msg *kafka.Message) {
message, err := decoder.FromBytes(msg.Value)
if err != nil {
logger.Debugf("Unable to decode message during consumer ack")
return
}
latency := time.Since(message.CreatedTime)
reporter.ConsumptionDelay(latency)
}
}
func Display(decoder serde.Decoder) Callback {
return func(msg *kafka.Message) {
message, _ := decoder.FromBytes(msg.Value)
logger.Debugf("received message on %s: message: %s\n", msg.TopicPartition, message.String())
}
}