Requeuer and Message Delay

_examples/real-world-examples/delayed-messages/docker-compose.yml

@@ -0,0 +1,19 @@
+services:
+  server:
+    image: golang:1.23
+    restart: unless-stopped
+    volumes:
+      - .:/app
+      - $GOPATH/pkg/mod:/go/pkg/mod
+    working_dir: /app
+    command: go run main.go
+
+  postgres:
+    image: postgres:15
+    restart: unless-stopped
+    ports:
+      - 5432:5432
+    environment:
+      POSTGRES_USER: watermill
+      POSTGRES_DB: watermill
+      POSTGRES_PASSWORD: "password"

_examples/real-world-examples/delayed-messages/go.mod

@@ -0,0 +1,25 @@
+module delayed-messsages
+
+go 1.23.0
+
+require (
+	github.com/ThreeDotsLabs/watermill v1.4.0-rc.1.0.20241011082756-1cb09cdf7d08
+	github.com/ThreeDotsLabs/watermill-sql/v3 v3.1.1-0.20241011111920-9b207ae2da1c
+	github.com/google/uuid v1.6.0
+	github.com/lib/pq v1.10.2
+)
+
+require (
+	github.com/cenkalti/backoff/v3 v3.2.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/lithammer/shortuuid/v3 v3.0.7 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sony/gobreaker v1.0.0 // indirect
+)
+
+replace github.com/ThreeDotsLabs/watermill => ../../../
+
+replace github.com/ThreeDotsLabs/watermill-sql/v3 => ../../../../watermill-sql

_examples/real-world-examples/delayed-messages/go.sum

@@ -0,0 +1,100 @@
+github.com/ThreeDotsLabs/watermill-sql/v3 v3.0.4-0.20240906115919-b00f99a56e28 h1:Yw7uu/UI47iavtR16hO35RrX2g0PcPQOgUXSLgDQJAo=
+github.com/ThreeDotsLabs/watermill-sql/v3 v3.0.4-0.20240906115919-b00f99a56e28/go.mod h1:G8/otZYWLTCeYL2Ww3ujQ7gQ/3+jw5Bj0UtyKn7bBjA=
+github.com/ThreeDotsLabs/watermill-sql/v3 v3.0.4-0.20240906121028-f42a4cbde116 h1:x5TprGnmHVFMIvaQlM63IL4sJbKi5ivADe7con4lzXg=
+github.com/ThreeDotsLabs/watermill-sql/v3 v3.0.4-0.20240906121028-f42a4cbde116/go.mod h1:G8/otZYWLTCeYL2Ww3ujQ7gQ/3+jw5Bj0UtyKn7bBjA=
+github.com/ThreeDotsLabs/watermill-sql/v3 v3.0.4-0.20240906121631-62f93534b600 h1:OsYZlahUgx8wbKS2cLt5GIHw1xoHjGmeFE/CyNhy2hY=
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_examples/real-world-examples/delayed-messages/main.go

@@ -0,0 +1,128 @@
+package main
+
+import (
+	"context"
+	stdSQL "database/sql"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/google/uuid"
+	_ "github.com/lib/pq"
+
+	"github.com/ThreeDotsLabs/watermill"
+	"github.com/ThreeDotsLabs/watermill-sql/v3/pkg/sql"
+	"github.com/ThreeDotsLabs/watermill/components/cqrs"
+	"github.com/ThreeDotsLabs/watermill/components/delay"
+	"github.com/ThreeDotsLabs/watermill/message"
+)
+
+func main() {
+	db, err := stdSQL.Open("postgres", "postgres://watermill:password@localhost:5432/watermill?sslmode=disable")
+	if err != nil {
+		panic(err)
+	}
+
+	logger := watermill.NewStdLogger(false, false)
+
+	publisher, err := sql.NewDelayedPostgreSQLPublisher(db, sql.DelayedPostgreSQLPublisherConfig{
+		DelayPublisherConfig: delay.PublisherConfig{
+			DefaultDelay: delay.For(10 * time.Second),
+		},
+		Logger: logger,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	eventBus, err := cqrs.NewEventBusWithConfig(publisher, cqrs.EventBusConfig{
+		GeneratePublishTopic: func(params cqrs.GenerateEventPublishTopicParams) (string, error) {
+			return params.EventName, nil
+		},
+		Marshaler: cqrs.JSONMarshaler{},
+		Logger:    logger,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	router := message.NewDefaultRouter(logger)
+
+	eventProcessor, err := cqrs.NewEventProcessorWithConfig(router, cqrs.EventProcessorConfig{
+		GenerateSubscribeTopic: func(params cqrs.EventProcessorGenerateSubscribeTopicParams) (string, error) {
+			return params.EventName, nil
+		},
+		SubscriberConstructor: func(params cqrs.EventProcessorSubscriberConstructorParams) (message.Subscriber, error) {
+			return sql.NewDelayedPostgreSQLSubscriber(db, sql.DelayedPostgreSQLSubscriberConfig{
+				DeleteOnAck: true,
+				Logger:      logger,
+			})
+		},
+		Marshaler: cqrs.JSONMarshaler{},
+		Logger:    logger,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	err = eventProcessor.AddHandlers(
+		cqrs.NewEventHandler(
+			"OnOrderPlacedHandler",
+			func(ctx context.Context, event *OrderPlaced) error {
+				fmt.Println("Received order placed:", event.OrderID)
+
+				msg := cqrs.OriginalMessageFromCtx(ctx)
+				delayedUntil := msg.Metadata.Get(delay.DelayedUntilKey)
+				delayedFor := msg.Metadata.Get(delay.DelayedForKey)
+
+				if delayedUntil != "" {
+					fmt.Println("\tDelayed until:", delayedUntil)
+					fmt.Println("\tDelayed for:", delayedFor)
+				}
+
+				return nil
+			},
+		),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	go func() {
+		err = router.Run(context.Background())
+		if err != nil {
+			panic(err)
+		}
+	}()
+
+	<-router.Running()
+
+	msg := message.NewMessage(watermill.NewUUID(), nil)
+	delay.Message(msg, delay.For(10*time.Second))
+
+	for {
+		e := OrderPlaced{
+			OrderID: uuid.NewString(),
+		}
+
+		ctx := context.Background()
+
+		chance := rand.Intn(10)
+		if chance > 8 {
+			ctx = delay.WithContext(ctx, delay.Until(time.Now().UTC().Add(time.Minute)))
+		} else if chance > 5 {
+			ctx = delay.WithContext(ctx, delay.For(20*time.Second))
+		}
+
+		err = eventBus.Publish(ctx, e)
+		if err != nil {
+			panic(err)
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+}
+
+type OrderPlaced struct {
+	OrderID string `json:"order_id"`
+}

_examples/real-world-examples/delayed-requeue/docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  server:
+    image: golang:1.23
+      #restart: unless-stopped
+    volumes:
+      - .:/app
+      - $GOPATH/pkg/mod:/go/pkg/mod
+    working_dir: /app
+      #command: go run main.go
+    command: echo
+
+  postgres:
+    image: postgres:15
+    restart: unless-stopped
+    ports:
+      - 5432:5432
+    environment:
+      POSTGRES_USER: watermill
+      POSTGRES_DB: watermill
+      POSTGRES_PASSWORD: "password"

_examples/real-world-examples/delayed-requeue/go.mod

@@ -0,0 +1,27 @@
+module delayed-poison-queue
+
+go 1.23.0
+
+require (
+	github.com/ThreeDotsLabs/watermill v1.4.0-rc.1.0.20241011082756-1cb09cdf7d08
+	github.com/ThreeDotsLabs/watermill-sql/v3 v3.1.1-0.20241011111920-9b207ae2da1c
+	github.com/brianvoe/gofakeit/v6 v6.28.0
+	github.com/lib/pq v1.10.9
+)
+
+require (
+	github.com/cenkalti/backoff/v3 v3.2.2 // indirect
+	github.com/go-sql-driver/mysql v1.8.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/lithammer/shortuuid/v3 v3.0.7 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/sony/gobreaker v1.0.0 // indirect
+)
+
+replace github.com/ThreeDotsLabs/watermill => ../../../
+
+replace github.com/ThreeDotsLabs/watermill-sql/v3 => ../../../../watermill-sql