✨ Enhance observability and error handling in NATS integration. Introduce comprehensive OpenTelemetry support with environment-based sampling and semantic attributes for tracing and metrics. Implement an advisory dead-letter queue (DLQ) handler for managing message delivery failures. Update NATS consumer to utilize structured logging and improve error handling strategies. Refactor configuration files for OpenTelemetry collector in both development and production environments, ensuring robust telemetry integration. Enhance documentation to reflect new features and best practices for observability.

internal/infra/nats/dlq_test.go

@@ -7,9 +7,9 @@ import (
 	configpkg "caatsm/internal/infra/config"
 	"caatsm/internal/infra/telemetry"
 
+	"github.com/nats-io/nats.go"
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
-	"github.com/nats-io/nats.go"
 	"go.uber.org/zap"
 	"go.uber.org/zap/zaptest"
 )
@@ -31,7 +31,9 @@ var _ = Describe("DLQ", func() {
 
 		It("returns nil when mode is not jetstream", func() {
 			c := &Consumer{
-				mode: "core",
+				config: consumerConfig{
+					mode: "core",
+				},
 				cfg: &configpkg.Config{
 					DLQ: configpkg.DLQConfig{
 						Enabled: true,
@@ -45,8 +47,10 @@ var _ = Describe("DLQ", func() {
 
 		It("clears dlqSubject when DLQ is disabled", func() {
 			c := &Consumer{
-				mode:      "jetstream",
-				dlqSubject: "caatsm.dlq",
+				config: consumerConfig{
+					mode:       "jetstream",
+					dlqSubject: "caatsm.dlq",
+				},
 				cfg: &configpkg.Config{
 					DLQ: configpkg.DLQConfig{
 						Enabled: false,
@@ -56,13 +60,15 @@ var _ = Describe("DLQ", func() {
 				logger: logger,
 			}
 			Expect(c.validateDLQ()).To(Succeed())
-			Expect(c.dlqSubject).To(Equal(""))
+			Expect(c.config.dlqSubject).To(Equal(""))
 		})
 
 		It("returns error when DLQ is enabled but subject is empty", func() {
 			c := &Consumer{
-				mode:      "jetstream",
-				dlqSubject: "",
+				config: consumerConfig{
+					mode:       "jetstream",
+					dlqSubject: "",
+				},
 				cfg: &configpkg.Config{
 					DLQ: configpkg.DLQConfig{
 						Enabled: true,
@@ -78,9 +84,11 @@ var _ = Describe("DLQ", func() {
 
 		It("returns error when DLQ is enabled but JetStream context is nil", func() {
 			c := &Consumer{
-				mode:      "jetstream",
-				dlqSubject: "caatsm.dlq",
-				js:        nil,
+				config: consumerConfig{
+					mode:       "jetstream",
+					dlqSubject: "caatsm.dlq",
+				},
+				js: nil,
 				cfg: &configpkg.Config{
 					DLQ: configpkg.DLQConfig{
 						Enabled: true,
@@ -107,7 +115,9 @@ var _ = Describe("DLQ", func() {
 
 		It("returns nil when mode is not jetstream", func() {
 			c := &Consumer{
-				mode: "core",
+				config: consumerConfig{
+					mode: "core",
+				},
 			}
 			ctx := context.Background()
 			msg := &nats.Msg{}
@@ -117,9 +127,11 @@ var _ = Describe("DLQ", func() {
 
 		It("returns nil when dlqSubject is empty", func() {
 			c := &Consumer{
-				mode:      "jetstream",
-				dlqSubject: "",
-				js:        nil, // Can be nil for this test
+				config: consumerConfig{
+					mode:       "jetstream",
+					dlqSubject: "",
+				},
+				js: nil, // Can be nil for this test
 			}
 			ctx := context.Background()
 			msg := &nats.Msg{}
@@ -128,4 +140,3 @@ var _ = Describe("DLQ", func() {
 		})
 	})
 })
-