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consumers.go
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consumers.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
package tracing
import (
"context"
"fmt"
"github.com/absmach/magistrala/consumers"
"github.com/absmach/magistrala/internal/server"
mgjson "github.com/absmach/magistrala/pkg/transformers/json"
"github.com/absmach/magistrala/pkg/transformers/senml"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
const (
consumeBlockingOP = "retrieve_blocking" // This is not specified in the open telemetry spec.
consumeAsyncOP = "retrieve_async" // This is not specified in the open telemetry spec.
)
var defaultAttributes = []attribute.KeyValue{
attribute.String("messaging.system", "nats"),
attribute.Bool("messaging.destination.anonymous", false),
attribute.String("messaging.destination.template", "channels/{channelID}/messages/*"),
attribute.Bool("messaging.destination.temporary", true),
attribute.String("network.protocol.name", "nats"),
attribute.String("network.protocol.version", "2.2.4"),
attribute.String("network.transport", "tcp"),
attribute.String("network.type", "ipv4"),
}
var (
_ consumers.AsyncConsumer = (*tracingMiddlewareAsync)(nil)
_ consumers.BlockingConsumer = (*tracingMiddlewareBlock)(nil)
)
type tracingMiddlewareAsync struct {
consumer consumers.AsyncConsumer
tracer trace.Tracer
host server.Config
}
type tracingMiddlewareBlock struct {
consumer consumers.BlockingConsumer
tracer trace.Tracer
host server.Config
}
// NewAsync creates a new traced consumers.AsyncConsumer service.
func NewAsync(tracer trace.Tracer, consumerAsync consumers.AsyncConsumer, host server.Config) consumers.AsyncConsumer {
return &tracingMiddlewareAsync{
consumer: consumerAsync,
tracer: tracer,
host: host,
}
}
// NewBlocking creates a new traced consumers.BlockingConsumer service.
func NewBlocking(tracer trace.Tracer, consumerBlock consumers.BlockingConsumer, host server.Config) consumers.BlockingConsumer {
return &tracingMiddlewareBlock{
consumer: consumerBlock,
tracer: tracer,
host: host,
}
}
// ConsumeBlocking traces consume operations for message/s consumed.
func (tm *tracingMiddlewareBlock) ConsumeBlocking(ctx context.Context, messages interface{}) error {
var span trace.Span
switch m := messages.(type) {
case mgjson.Messages:
if len(m.Data) > 0 {
firstMsg := m.Data[0]
ctx, span = createSpan(ctx, consumeBlockingOP, firstMsg.Publisher, firstMsg.Channel, firstMsg.Subtopic, len(m.Data), tm.host, trace.SpanKindConsumer, tm.tracer)
defer span.End()
}
case []senml.Message:
if len(m) > 0 {
firstMsg := m[0]
ctx, span = createSpan(ctx, consumeBlockingOP, firstMsg.Publisher, firstMsg.Channel, firstMsg.Subtopic, len(m), tm.host, trace.SpanKindConsumer, tm.tracer)
defer span.End()
}
}
return tm.consumer.ConsumeBlocking(ctx, messages)
}
// ConsumeAsync traces consume operations for message/s consumed.
func (tm *tracingMiddlewareAsync) ConsumeAsync(ctx context.Context, messages interface{}) {
var span trace.Span
switch m := messages.(type) {
case mgjson.Messages:
if len(m.Data) > 0 {
firstMsg := m.Data[0]
ctx, span = createSpan(ctx, consumeAsyncOP, firstMsg.Publisher, firstMsg.Channel, firstMsg.Subtopic, len(m.Data), tm.host, trace.SpanKindConsumer, tm.tracer)
defer span.End()
}
case []senml.Message:
if len(m) > 0 {
firstMsg := m[0]
ctx, span = createSpan(ctx, consumeAsyncOP, firstMsg.Publisher, firstMsg.Channel, firstMsg.Subtopic, len(m), tm.host, trace.SpanKindConsumer, tm.tracer)
defer span.End()
}
}
tm.consumer.ConsumeAsync(ctx, messages)
}
// Errors traces async consume errors.
func (tm *tracingMiddlewareAsync) Errors() <-chan error {
return tm.consumer.Errors()
}
func createSpan(ctx context.Context, operation, clientID, topic, subTopic string, noMessages int, cfg server.Config, spanKind trace.SpanKind, tracer trace.Tracer) (context.Context, trace.Span) {
subject := fmt.Sprintf("channels.%s.messages", topic)
if subTopic != "" {
subject = fmt.Sprintf("%s.%s", subject, subTopic)
}
spanName := fmt.Sprintf("%s %s", subject, operation)
kvOpts := []attribute.KeyValue{
attribute.String("messaging.operation", operation),
attribute.String("messaging.client_id", clientID),
attribute.String("messaging.destination.name", subject),
attribute.String("server.address", cfg.Host),
attribute.String("server.socket.port", cfg.Port),
attribute.Int("messaging.batch.message_count", noMessages),
}
kvOpts = append(kvOpts, defaultAttributes...)
return tracer.Start(ctx, spanName, trace.WithAttributes(kvOpts...), trace.WithSpanKind(spanKind))
}