sarama

Documentation

Overview

Package sarama provides functions to trace the Shopify/sarama package (https://github.com/Shopify/sarama).

Example (AsyncProducer)

package main

import (
	"github.com/Shopify/sarama"

	saramatrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/Shopify/sarama"
)

func main() {
	cfg := sarama.NewConfig()
	cfg.Version = sarama.V0_11_0_0 // minimum version that supports headers which are required for tracing

	producer, err := sarama.NewAsyncProducer([]string{"localhost:9092"}, cfg)
	if err != nil {
		panic(err)
	}
	defer producer.Close()

	producer = saramatrace.WrapAsyncProducer(cfg, producer)

	msg := &sarama.ProducerMessage{
		Topic: "some-topic",
		Value: sarama.StringEncoder("Hello World"),
	}
	producer.Input() <- msg
}

Example (Consumer)

package main

import (
	"log"

	"github.com/Shopify/sarama"

	saramatrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/Shopify/sarama"
	"gopkg.in/CodapeWild/dd-trace-go.v1/ddtrace/tracer"
)

func main() {
	consumer, err := sarama.NewConsumer([]string{"localhost:9092"}, nil)
	if err != nil {
		panic(err)
	}
	defer consumer.Close()

	consumer = saramatrace.WrapConsumer(consumer)

	partitionConsumer, err := consumer.ConsumePartition("some-topic", 0, sarama.OffsetNewest)
	if err != nil {
		panic(err)
	}
	defer partitionConsumer.Close()

	consumed := 0
	for msg := range partitionConsumer.Messages() {
		// if you want to use the kafka message as a parent span:
		if spanctx, err := tracer.Extract(saramatrace.NewConsumerMessageCarrier(msg)); err == nil {
			// you can create a span using ChildOf(spanctx)
			_ = spanctx
		}

		log.Printf("Consumed message offset %d\n", msg.Offset)
		consumed++
	}
}

Example (SyncProducer)

package main

import (
	"github.com/Shopify/sarama"

	saramatrace "gopkg.in/CodapeWild/dd-trace-go.v1/contrib/Shopify/sarama"
)

func main() {
	cfg := sarama.NewConfig()
	cfg.Producer.Return.Successes = true

	producer, err := sarama.NewSyncProducer([]string{"localhost:9092"}, cfg)
	if err != nil {
		panic(err)
	}
	defer producer.Close()

	producer = saramatrace.WrapSyncProducer(cfg, producer)

	msg := &sarama.ProducerMessage{
		Topic: "some-topic",
		Value: sarama.StringEncoder("Hello World"),
	}
	_, _, err = producer.SendMessage(msg)
	if err != nil {
		panic(err)
	}
}

Index

• func WrapAsyncProducer(saramaConfig *sarama.Config, p sarama.AsyncProducer, opts ...Option) sarama.AsyncProducer
• func WrapConsumer(c sarama.Consumer, opts ...Option) sarama.Consumer
• func WrapPartitionConsumer(pc sarama.PartitionConsumer, opts ...Option) sarama.PartitionConsumer
• func WrapSyncProducer(saramaConfig *sarama.Config, producer sarama.SyncProducer, opts ...Option) sarama.SyncProducer
• type ConsumerMessageCarrier
  • func NewConsumerMessageCarrier(msg *sarama.ConsumerMessage) ConsumerMessageCarrier
  • func (c ConsumerMessageCarrier) ForeachKey(handler func(key, val string) error) error
  • func (c ConsumerMessageCarrier) Set(key, val string)
• type Option
  • func WithAnalytics(on bool) Option
  • func WithAnalyticsRate(rate float64) Option
  • func WithServiceName(name string) Option
• type ProducerMessageCarrier
  • func NewProducerMessageCarrier(msg *sarama.ProducerMessage) ProducerMessageCarrier
  • func (c ProducerMessageCarrier) ForeachKey(handler func(key, val string) error) error
  • func (c ProducerMessageCarrier) Set(key, val string)

Examples

• Package (AsyncProducer)
• Package (Consumer)
• Package (SyncProducer)

Functions

func WrapAsyncProducer

func WrapAsyncProducer(saramaConfig *sarama.Config, p sarama.AsyncProducer, opts ...Option) sarama.AsyncProducer

WrapAsyncProducer wraps a sarama.AsyncProducer so that all produced messages are traced. It requires the underlying sarama Config so we can know whether or not successes will be returned. Tracing requires at least sarama.V0_11_0_0 version which is the first version that supports headers. Only spans of successfully published messages have partition and offset tags set.

func WrapConsumer

func WrapConsumer(c sarama.Consumer, opts ...Option) sarama.Consumer

WrapConsumer wraps a sarama.Consumer wrapping any PartitionConsumer created via Consumer.ConsumePartition.

func WrapPartitionConsumer

func WrapPartitionConsumer(pc sarama.PartitionConsumer, opts ...Option) sarama.PartitionConsumer

WrapPartitionConsumer wraps a sarama.PartitionConsumer causing each received message to be traced.

func WrapSyncProducer

func WrapSyncProducer(saramaConfig *sarama.Config, producer sarama.SyncProducer, opts ...Option) sarama.SyncProducer

WrapSyncProducer wraps a sarama.SyncProducer so that all produced messages are traced.

Types

type ConsumerMessageCarrier

type ConsumerMessageCarrier struct {
	// contains filtered or unexported fields
}

A ConsumerMessageCarrier injects and extracts traces from a sarama.ConsumerMessage.

func NewConsumerMessageCarrier

func NewConsumerMessageCarrier(msg *sarama.ConsumerMessage) ConsumerMessageCarrier

NewConsumerMessageCarrier creates a new ConsumerMessageCarrier.

func (ConsumerMessageCarrier) ForeachKey

func (c ConsumerMessageCarrier) ForeachKey(handler func(key, val string) error) error

ForeachKey iterates over every header.

func (ConsumerMessageCarrier) Set

func (c ConsumerMessageCarrier) Set(key, val string)

Set sets a header.

type Option

type Option func(cfg *config)

An Option is used to customize the config for the sarama tracer.

func WithAnalytics

func WithAnalytics(on bool) Option

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) Option

WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.

func WithServiceName

func WithServiceName(name string) Option

WithServiceName sets the given service name for the intercepted client.

type ProducerMessageCarrier

type ProducerMessageCarrier struct {
	// contains filtered or unexported fields
}

A ProducerMessageCarrier injects and extracts traces from a sarama.ProducerMessage.

func NewProducerMessageCarrier

func NewProducerMessageCarrier(msg *sarama.ProducerMessage) ProducerMessageCarrier

NewProducerMessageCarrier creates a new ProducerMessageCarrier.

func (ProducerMessageCarrier) ForeachKey

func (c ProducerMessageCarrier) ForeachKey(handler func(key, val string) error) error

ForeachKey iterates over every header.

func (ProducerMessageCarrier) Set

func (c ProducerMessageCarrier) Set(key, val string)

Set sets a header.