[internal/rabbitmq] move connection and retry logic into separate pkg (…

…open-telemetry#34361)

This PR moves the retry logic from amqp publisher to amqp connection.
Connection, client and other utility structures have been moved from
`exporter/rabbitmqexporter/internal/publisher` to `internal/rabbitmq`.

**Link to tracking Issue:** open-telemetry#34242


----

cc @swar8080 @atoulme

---------

Signed-off-by: Benedikt Bongartz <bongartz@klimlive.de>
Co-authored-by: Alex Boten <223565+codeboten@users.noreply.github.com>

.github/CODEOWNERS

@@ -137,6 +137,7 @@ internal/kubelet/                                                   @open-teleme
 internal/metadataproviders/                                         @open-telemetry/collector-contrib-approvers @Aneurysm9 @dashpole
 internal/otelarrow/                                                 @open-telemetry/collector-contrib-approvers @jmacd @moh-osman3
 internal/pdatautil/                                                 @open-telemetry/collector-contrib-approvers @djaglowski
+internal/rabbitmq/                                                  @open-telemetry/collector-contrib-approvers @swar8080 @atoulme
 internal/sharedcomponent/                                           @open-telemetry/collector-contrib-approvers @open-telemetry/collector-approvers
 internal/splunk/                                                    @open-telemetry/collector-contrib-approvers @dmitryax
 internal/sqlquery/                                                  @open-telemetry/collector-contrib-approvers @crobert-1 @dmitryax

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -134,6 +134,7 @@ body:
       - internal/metadataproviders
       - internal/otelarrow
       - internal/pdatautil
+      - internal/rabbitmq
       - internal/sharedcomponent
       - internal/splunk
       - internal/sqlquery

.github/ISSUE_TEMPLATE/feature_request.yaml

@@ -128,6 +128,7 @@ body:
       - internal/metadataproviders
       - internal/otelarrow
       - internal/pdatautil
+      - internal/rabbitmq
       - internal/sharedcomponent
       - internal/splunk
       - internal/sqlquery

.github/ISSUE_TEMPLATE/other.yaml

@@ -128,6 +128,7 @@ body:
       - internal/metadataproviders
       - internal/otelarrow
       - internal/pdatautil
+      - internal/rabbitmq
       - internal/sharedcomponent
       - internal/splunk
       - internal/sqlquery

.github/ISSUE_TEMPLATE/unmaintained.yaml

@@ -133,6 +133,7 @@ body:
       - internal/metadataproviders
       - internal/otelarrow
       - internal/pdatautil
+      - internal/rabbitmq
       - internal/sharedcomponent
       - internal/splunk
       - internal/sqlquery

cmd/otelcontribcol/builder-config.yaml

@@ -355,6 +355,7 @@ replaces:
   - github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8sconfig => ../../internal/k8sconfig
   - github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8stest => ../../internal/k8stest
   - github.com/open-telemetry/opentelemetry-collector-contrib/internal/kafka => ../../internal/kafka
+  - github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq => ../../internal/rabbitmq
   - github.com/open-telemetry/opentelemetry-collector-contrib/receiver/carbonreceiver => ../../receiver/carbonreceiver
   - github.com/open-telemetry/opentelemetry-collector-contrib/exporter/splunkhecexporter => ../../exporter/splunkhecexporter
   - github.com/open-telemetry/opentelemetry-collector-contrib/exporter/prometheusexporter => ../../exporter/prometheusexporter

cmd/otelcontribcol/go.mod

@@ -640,6 +640,7 @@ require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/metadataproviders v0.107.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/otelarrow v0.107.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/pdatautil v0.107.0 // indirect
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq v0.107.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/sharedcomponent v0.107.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/splunk v0.107.0 // indirect
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/sqlquery v0.107.0 // indirect
@@ -1073,6 +1074,8 @@ replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/k8ste
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/kafka => ../../internal/kafka
 
+replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq => ../../internal/rabbitmq
+
 replace github.com/open-telemetry/opentelemetry-collector-contrib/receiver/carbonreceiver => ../../receiver/carbonreceiver
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/exporter/splunkhecexporter => ../../exporter/splunkhecexporter

exporter/rabbitmqexporter/factory.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter/internal/metadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/exporter/rabbitmqexporter/internal/publisher"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq"
 )
 
 const (
@@ -133,7 +134,7 @@ func getRoutingKeyOrDefault(config *Config, fallback string) string {
 
 func newPublisherFactory(set exporter.Settings) publisherFactory {
 	return func(dialConfig publisher.DialConfig) (publisher.Publisher, error) {
-		return publisher.NewConnection(set.Logger, publisher.NewAmqpClient(), dialConfig)
+		return publisher.NewConnection(set.Logger, rabbitmq.NewAmqpClient(set.Logger), dialConfig)
 	}
 }
 

exporter/rabbitmqexporter/go.mod

@@ -4,6 +4,7 @@ go 1.22.0
 
 require (
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal v0.107.0
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq v0.107.0
 	github.com/rabbitmq/amqp091-go v1.10.0
 	github.com/stretchr/testify v1.9.0
 	github.com/testcontainers/testcontainers-go v0.31.0
@@ -110,6 +111,8 @@ require (
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal => ../../internal/coreinternal
 
+replace github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq => ../../internal/rabbitmq
+
 replace github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatautil => ../../pkg/pdatautil
 
 replace github.com/open-telemetry/opentelemetry-collector-contrib/pkg/pdatatest => ../../pkg/pdatatest

exporter/rabbitmqexporter/internal/publisher/publisher.go

@@ -5,26 +5,20 @@ package publisher // import "github.com/open-telemetry/opentelemetry-collector-c
 
 import (
 	"context"
-	"crypto/tls"
 	"errors"
 	"fmt"
-	"sync"
 	"time"
 
 	amqp "github.com/rabbitmq/amqp091-go"
 	"go.uber.org/zap"
+
+	otelrabbitmq "github.com/open-telemetry/opentelemetry-collector-contrib/internal/rabbitmq"
 )
 
 type DialConfig struct {
-	URL                        string
+	otelrabbitmq.DialConfig
 	Durable                    bool
-	Vhost                      string
-	Auth                       amqp.Authentication
-	ConnectionTimeout          time.Duration
-	Heartbeat                  time.Duration
 	PublishConfirmationTimeout time.Duration
-	TLS                        *tls.Config
-	ConnectionName             string
 }
 
 type Message struct {
@@ -33,20 +27,20 @@ type Message struct {
 	Body       []byte
 }
 
-func NewConnection(logger *zap.Logger, client AmqpClient, config DialConfig) (Publisher, error) {
+func NewConnection(logger *zap.Logger, client otelrabbitmq.AmqpClient, config DialConfig) (Publisher, error) {
 	p := publisher{
-		logger:           logger,
-		client:           client,
-		config:           config,
-		connLock:         &sync.Mutex{},
-		connectionErrors: make(chan *amqp.Error, 1),
+		logger: logger,
+		client: client,
+		config: config,
 	}
 
-	p.connLock.Lock()
-	defer p.connLock.Unlock()
-	err := p.connect()
+	conn, err := p.client.DialConfig(p.config.DialConfig)
+	if err != nil {
+		return &p, err
+	}
+	p.connection = conn
 
-	return &p, err
+	return &p, nil
 }
 
 type Publisher interface {
@@ -55,16 +49,14 @@ type Publisher interface {
 }
 
 type publisher struct {
-	logger           *zap.Logger
-	client           AmqpClient
-	config           DialConfig
-	connLock         *sync.Mutex
-	connection       Connection
-	connectionErrors chan *amqp.Error
+	logger     *zap.Logger
+	client     otelrabbitmq.AmqpClient
+	config     DialConfig
+	connection otelrabbitmq.Connection
 }
 
 func (p *publisher) Publish(ctx context.Context, message Message) error {
-	err := p.reconnectIfUnhealthy()
+	err := p.connection.ReconnectIfUnhealthy()
 	if err != nil {
 		return err
 	}
@@ -73,7 +65,7 @@ func (p *publisher) Publish(ctx context.Context, message Message) error {
 	// This could later be optimized to re-use channels which avoids repeated network calls to create and close them.
 	// Concurrency-control through something like a resource pool would be necessary since aqmp channels are not thread safe.
 	channel, err := p.connection.Channel()
-	defer func(channel Channel) {
+	defer func(channel otelrabbitmq.Channel) {
 		if channel != nil {
 			err2 := channel.Close()
 			if err2 != nil {
@@ -125,71 +117,9 @@ func (p *publisher) Publish(ctx context.Context, message Message) error {
 	}
 }
 
-func (p *publisher) reconnectIfUnhealthy() error {
-	p.connLock.Lock()
-	defer p.connLock.Unlock()
-
-	hasConnectionError := false
-	select {
-	case err := <-p.connectionErrors:
-		hasConnectionError = true
-		p.logger.Info("Received connection error, will retry restoring unhealthy connection", zap.Error(err))
-	default:
-		break
-	}
-
-	if hasConnectionError || !p.isConnected() {
-		if p.isConnected() {
-			err := p.connection.Close()
-			if err != nil {
-				p.logger.Warn("Error closing unhealthy connection", zap.Error(err))
-			}
-		}
-
-		if err := p.connect(); err != nil {
-			return errors.Join(errors.New("failed attempt at restoring unhealthy connection"), err)
-		}
-		p.logger.Info("Successfully restored unhealthy rabbitmq connection")
-	}
-
-	return nil
-}
-
-func (p *publisher) connect() error {
-	p.logger.Debug("Connecting to rabbitmq")
-
-	properties := amqp.Table{}
-	properties.SetClientConnectionName(p.config.ConnectionName)
-
-	connection, err := p.client.DialConfig(p.config.URL, amqp.Config{
-		SASL:            []amqp.Authentication{p.config.Auth},
-		Vhost:           p.config.Vhost,
-		Heartbeat:       p.config.Heartbeat,
-		Dial:            amqp.DefaultDial(p.config.ConnectionTimeout),
-		Properties:      properties,
-		TLSClientConfig: p.config.TLS,
-	})
-	if connection != nil {
-		p.connection = connection
-	}
-	if err != nil {
-		return err
-	}
-
-	// Goal is to lazily restore the connection so this needs to be buffered to avoid blocking on asynchronous amqp errors.
-	// Also re-create this channel each time because apparently the amqp library can close it
-	p.connectionErrors = make(chan *amqp.Error, 1)
-	p.connection.NotifyClose(p.connectionErrors)
-	return nil
-}
-
 func (p *publisher) Close() error {
-	if p.isConnected() {
-		return p.connection.Close()
+	if p.connection == nil {
+		return nil
 	}
-	return nil
-}
-
-func (p *publisher) isConnected() bool {
-	return p.connection != nil && !p.connection.IsClosed()
+	return p.connection.Close()
 }