feat: implement subscriber

.golangci.yaml

@@ -92,7 +92,7 @@ linters-settings:
         # Default: true
         skipRecvDeref: false
 
-  gomnd:
+  mnd:
     # List of function patterns to exclude from analysis.
     # Values always ignored: `time.Date`,
     # `strconv.FormatInt`, `strconv.FormatUint`, `strconv.FormatFloat`,
@@ -200,7 +200,6 @@ linters:
     - durationcheck # checks for two durations multiplied together
     - errname # checks that sentinel errors are prefixed with the Err and error types are suffixed with the Error
     - errorlint # finds code that will cause problems with the error wrapping scheme introduced in Go 1.13
-    - execinquery # checks query string in Query function which reads your Go src files and warning it finds
     - exhaustive # checks exhaustiveness of enum switch statements
     - exportloopref # checks for pointers to enclosing loop variables
     - forbidigo # forbids identifiers
@@ -215,7 +214,7 @@ linters:
     - gocyclo # computes and checks the cyclomatic complexity of functions
     - godot # checks if comments end in a period
     - goimports # in addition to fixing imports, goimports also formats your code in the same style as gofmt
-    - gomnd # detects magic numbers
+    - mnd # detects magic numbers
     - gomoddirectives # manages the use of 'replace', 'retract', and 'excludes' directives in go.mod
     - gomodguard # allow and block lists linter for direct Go module dependencies. This is different from depguard where there are different block types for example version constraints and module recommendations
     - goprintffuncname # checks that printf-like functions are named with f at the end
@@ -276,6 +275,7 @@ linters:
     #- depguard # [replaced by gomodguard] checks if package imports are in a list of acceptable packages
     #- dogsled # checks assignments with too many blank identifiers (e.g. x, _, _, _, := f())
     #- dupword # [useless without config] checks for duplicate words in the source code
+    #- execinquery # checks query string in Query function which reads your Go src files and warning it finds
     #- errchkjson # [don't see profit + I'm against of omitting errors like in the first example https://github.com/breml/errchkjson] checks types passed to the json encoding functions. Reports unsupported types and optionally reports occasions, where the check for the returned error can be omitted
     #- forcetypeassert # [replaced by errcheck] finds forced type assertions
     #- goerr113 # [too strict] checks the errors handling expressions

broker/broker.go

@@ -4,6 +4,9 @@ import (
 	"github.com/x4b1/messenger"
 )
 
+// MessageIDKey defines the key that will be send the message unique identifier.
+const MessageIDKey = "message_id"
+
 //go:generate moq -stub -out x_broker_mock_test.go . Broker
 
 // Broker is the interface that wraps the basic message publishing.

broker/sns/publisher.go

@@ -14,6 +14,9 @@ import (
 
 var _ broker.Broker = &Publisher{}
 
+//nolint:typecheck // aws constant to not generate every time.
+var awsStringDataType = aws.String("String")
+
 //go:generate moq -pkg sns_test -stub -out publisher_mock_test.go . Client
 
 // Client defines the AWS SNS methods used by the Publisher. This is used for testing purposes.
@@ -81,10 +84,16 @@ type Publisher struct {
 // Publish publishes the given message to the pubsub topic.
 func (p Publisher) Publish(ctx context.Context, msg messenger.Message) error {
 	md := msg.Metadata()
-	att := make(map[string]types.MessageAttributeValue, len(md))
+	att := make(map[string]types.MessageAttributeValue)
+
+	att[broker.MessageIDKey] = types.MessageAttributeValue{
+		DataType:    awsStringDataType,
+		StringValue: aws.String(msg.ID()),
+	}
+
 	for k, v := range md {
 		att[k] = types.MessageAttributeValue{
-			DataType:    aws.String("String"),
+			DataType:    awsStringDataType,
 			StringValue: aws.String(v),
 		}
 	}

broker/sns/publisher_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"github.com/x4b1/messenger"
+	"github.com/x4b1/messenger/broker"
 	publisher "github.com/x4b1/messenger/broker/sns"
 )
 
@@ -65,8 +66,9 @@ func TestPublish(t *testing.T) {
 				Message:                aws.String(string(msg.Payload())),
 				MessageGroupId:         nil,
 				MessageAttributes: map[string]types.MessageAttributeValue{
-					"aggregate_id": {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
-					metaKey:        {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					"aggregate_id":      {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
+					metaKey:             {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					broker.MessageIDKey: {DataType: aws.String("String"), StringValue: aws.String(msg.MsgID)},
 				},
 				TopicArn: aws.String(topicARN),
 			},
@@ -79,8 +81,9 @@ func TestPublish(t *testing.T) {
 				Message:                aws.String(string(msg.Payload())),
 				MessageGroupId:         aws.String(defaultOrdKey),
 				MessageAttributes: map[string]types.MessageAttributeValue{
-					"aggregate_id": {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
-					metaKey:        {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					"aggregate_id":      {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
+					metaKey:             {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					broker.MessageIDKey: {DataType: aws.String("String"), StringValue: aws.String(msg.MsgID)},
 				},
 				TopicArn: aws.String(topicARN),
 			},
@@ -97,8 +100,9 @@ func TestPublish(t *testing.T) {
 				Message:                aws.String(string(msg.Payload())),
 				MessageGroupId:         aws.String(orderingValue),
 				MessageAttributes: map[string]types.MessageAttributeValue{
-					"aggregate_id": {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
-					metaKey:        {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					"aggregate_id":      {DataType: aws.String("String"), StringValue: aws.String(msg.Metadata()["aggregate_id"])},
+					metaKey:             {DataType: aws.String("String"), StringValue: aws.String(orderingValue)},
+					broker.MessageIDKey: {DataType: aws.String("String"), StringValue: aws.String(msg.MsgID)},
 				},
 				TopicArn: aws.String(topicARN),
 			},

broker/sqs/publisher.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/config"
 	"github.com/aws/aws-sdk-go-v2/service/sqs"
 	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
 
@@ -14,45 +15,45 @@ import (
 
 var _ broker.Broker = &Publisher{}
 
-//go:generate moq -pkg sqs_test -stub -out publisher_mock_test.go . Client
+//nolint:typecheck // aws constant to not generate every time.
+var awsStringDataType = aws.String("String")
 
-// Client defines the AWS SQS methods used by the Publisher. This is used for testing purposes.
-type Client interface {
-	GetQueueUrl(context.Context, *sqs.GetQueueUrlInput, ...func(*sqs.Options)) (*sqs.GetQueueUrlOutput, error)
-	SendMessage(context.Context, *sqs.SendMessageInput, ...func(*sqs.Options)) (*sqs.SendMessageOutput, error)
-}
-
-// Option is a function to set options to Publisher.
-type Option func(*Publisher)
+// PublisherOption is a function to set options to Publisher.
+type PublisherOption func(*Publisher)
 
-// WithMetaOrderingKey setups the metadata key to get the ordering key.
-func WithMetaOrderingKey(key string) Option {
+// PublisherWithMetaOrderingKey setups the metadata key to get the ordering key.
+func PublisherWithMetaOrderingKey(key string) PublisherOption {
 	return func(p *Publisher) {
 		p.metaOrdKey = key
 	}
 }
 
-// WithDefaultOrderingKey setups the default ordering key.
-func WithDefaultOrderingKey(key string) Option {
+// PublisherWithDefaultOrderingKey setups the default ordering key.
+func PublisherWithDefaultOrderingKey(key string) PublisherOption {
 	return func(p *Publisher) {
 		p.defaultOrdKey = key
 	}
 }
 
-// WithFifoQueue setups the flag to use fifo queue.
-func WithFifoQueue(fifo bool) Option {
+// PublisherWithFifoQueue setups the flag to use fifo queue.
+func PublisherWithFifoQueue(fifo bool) PublisherOption {
 	return func(p *Publisher) {
 		p.fifo = fifo
 	}
 }
 
-// Open returns a new Publisher instance.
-func Open(ctx context.Context, awsOpts sqs.Options, queue string, opts ...Option) (*Publisher, error) {
-	return New(ctx, sqs.New(awsOpts), queue, opts...)
+// NewPublisherFromDefault returns a new Publisher instance.
+func NewPublisherFromDefault(ctx context.Context, queue string, opts ...PublisherOption) (*Publisher, error) {
+	cfg, err := config.LoadDefaultConfig(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("loading aws config from default: %w", err)
+	}
+
+	return NewPublisher(ctx, sqs.NewFromConfig(cfg), queue, opts...)
 }
 
-// New returns a new Publisher instance.
-func New(ctx context.Context, svc Client, queue string, opts ...Option) (*Publisher, error) {
+// NewPublisher returns a new Publisher instance.
+func NewPublisher(ctx context.Context, svc Client, queue string, opts ...PublisherOption) (*Publisher, error) {
 	q, err := svc.GetQueueUrl(ctx, &sqs.GetQueueUrlInput{QueueName: aws.String(queue)})
 	if err != nil {
 		return nil, fmt.Errorf("getting queue url: %w", err)
@@ -87,10 +88,16 @@ type Publisher struct {
 // Publish publishes the given message to the pubsub topic.
 func (p Publisher) Publish(ctx context.Context, msg messenger.Message) error {
 	md := msg.Metadata()
-	att := make(map[string]types.MessageAttributeValue, len(md))
+	att := make(map[string]types.MessageAttributeValue)
+
+	att[broker.MessageIDKey] = types.MessageAttributeValue{
+		DataType:    awsStringDataType,
+		StringValue: aws.String(msg.ID()),
+	}
+
 	for k, v := range md {
 		att[k] = types.MessageAttributeValue{
-			DataType:    aws.String("String"),
+			DataType:    awsStringDataType,
 			StringValue: aws.String(v),
 		}
 	}