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metrics.go
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metrics.go
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package metrics
import (
"context"
"time"
"github.com/alexfalkowski/go-service/nsq"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
)
// NewConsumer for metrics.
func NewConsumer(topic, channel string, meter metric.Meter, handler nsq.Consumer) (*Consumer, error) {
started, err := meter.Float64Counter("nsq_consumer_started_total", metric.WithDescription("Total number of messages started to be consumed."))
if err != nil {
return nil, err
}
received, err := meter.Float64Counter("nsq_consumer_msg_received_total", metric.WithDescription("Total number of messages consumed."))
if err != nil {
return nil, err
}
handled, err := meter.Float64Counter("nsq_consumer_handled_total", metric.WithDescription("Total number of messages consumed, regardless of success or failure."))
if err != nil {
return nil, err
}
handledHist, err := meter.Float64Histogram("nsq_consumer_handling_seconds",
metric.WithDescription("Histogram of response latency (seconds) of messages that had been consumed."))
if err != nil {
return nil, err
}
opts := metric.WithAttributes(
attribute.Key("nsq_topic").String(topic),
attribute.Key("nsq_channel").String(channel),
)
h := &Consumer{
opts: opts, started: started, received: received, handled: handled, handledHist: handledHist,
Consumer: handler,
}
return h, nil
}
// Consumer for metrics.
type Consumer struct {
opts metric.MeasurementOption
started metric.Float64Counter
received metric.Float64Counter
handled metric.Float64Counter
handledHist metric.Float64Histogram
nsq.Consumer
}
func (h *Consumer) Consume(ctx context.Context, message *nsq.Message) error {
st := time.Now()
h.started.Add(ctx, 1, h.opts)
h.received.Add(ctx, 1, h.opts)
if err := h.Consumer.Consume(ctx, message); err != nil {
return err
}
h.handled.Add(ctx, 1, h.opts)
h.handledHist.Record(ctx, time.Since(st).Seconds(), h.opts)
return nil
}
// NewProducer for metrics.
func NewProducer(meter metric.Meter, producer nsq.Producer) (*Producer, error) {
started, err := meter.Float64Counter("nsq_producer_started_total", metric.WithDescription("Total number of messages started by the producer."))
if err != nil {
return nil, err
}
sent, err := meter.Float64Counter("nsq_producer_msg_sent_total", metric.WithDescription("Total number of stream messages sent by the producer."))
if err != nil {
return nil, err
}
handled, err := meter.Float64Counter("nsq_producer_handled_total", metric.WithDescription("Total number of messages published, regardless of success or failure."))
if err != nil {
return nil, err
}
handledHist, err := meter.Float64Histogram("nsq_producer_handling_seconds",
metric.WithDescription("Histogram of response latency (seconds) of messages that had been application-level handled by the producer."))
if err != nil {
return nil, err
}
p := &Producer{
started: started, sent: sent, handled: handled, handledHist: handledHist,
Producer: producer,
}
return p, nil
}
// Producer for metrics.
type Producer struct {
started metric.Float64Counter
sent metric.Float64Counter
handled metric.Float64Counter
handledHist metric.Float64Histogram
nsq.Producer
}
func (p *Producer) Produce(ctx context.Context, topic string, message *nsq.Message) error {
st := time.Now()
opts := metric.WithAttributes(
attribute.Key("nsq_topic").String(topic),
)
p.started.Add(ctx, 1, opts)
p.sent.Add(ctx, 1, opts)
err := p.Producer.Produce(ctx, topic, message)
if err != nil {
return err
}
p.handled.Add(ctx, 1, opts)
p.handledHist.Record(ctx, time.Since(st).Seconds(), opts)
return nil
}