snapshot of https://github.com/ThreeDotsLabs/watermill.git (master, 2026-09-15; blobs > 131072B omitted)

2026-09-15 21:27:46 +05:00
commit ce933d1277
538 changed files with 46504 additions and 0 deletions
--- a/_examples/basic/1-your-first-app/.validate_example.yml
+++ b/_examples/basic/1-your-first-app/.validate_example.yml
@@ -0,0 +1,4 @@
+validation_cmd: "docker compose up"
+teardown_cmd: "docker compose down"
+timeout: 180
+expected_output: "received event {ID:[0-9]+}"
--- a/_examples/basic/1-your-first-app/README.md
+++ b/_examples/basic/1-your-first-app/README.md
@@ -0,0 +1,61 @@
+# Your first Watermill app
+
+This example project shows a basic setup of Watermill. The application runs in a loop, consuming events from a Kafka
+topic, modifying them and publishing to another topic.
+
+There's a docker-compose file included, so you can run the example and see it in action.
+
+To understand the background and internals, see [getting started guide](https://watermill.io/learn/getting-started/).
+
+## Files
+
+- [main.go](main.go) - example source code, the **most interesting file for you**
+- [docker-compose.yml](docker-compose.yml) - local environment Docker Compose configuration, contains Golang, Kafka and Zookeeper
+- [go.mod](go.mod) - Go modules dependencies, you can find more information at [Go wiki](https://github.com/golang/go/wiki/Modules)
+- [go.sum](go.sum) - Go modules checksums
+
+## Requirements
+
+To run this example you will need Docker and docker-compose installed. See the [installation guide](https://docs.docker.com/compose/install/).
+
+## Running
+
+```bash
+> docker-compose up
+[some initial logs]
+server_1     | 2019/08/29 19:41:23 received event {ID:0}
+server_1     | 2019/08/29 19:41:23 received event {ID:1}
+server_1     | 2019/08/29 19:41:23 received event {ID:2}
+server_1     | 2019/08/29 19:41:23 received event {ID:3}
+server_1     | 2019/08/29 19:41:24 received event {ID:4}
+server_1     | 2019/08/29 19:41:25 received event {ID:5}
+server_1     | 2019/08/29 19:41:26 received event {ID:6}
+server_1     | 2019/08/29 19:41:27 received event {ID:7}
+server_1     | 2019/08/29 19:41:28 received event {ID:8}
+server_1     | 2019/08/29 19:41:29 received event {ID:9}
+```
+
+Open another terminal and take a look at Kafka topics to see that all messages are there. The initial events should be present on the `events` topic:
+
+```bash
+> docker-compose exec server mill kafka consume -b kafka:9092 --topic events
+
+{"id":12}
+{"id":13}
+{"id":14}
+{"id":15}
+{"id":16}
+{"id":17}
+```
+
+And the processed messages will be stored in the `events-processed` topic:
+
+```bash
+> docker-compose exec server mill kafka consume -b kafka:9092 -t events-processed 
+
+{"processed_id":21,"time":"2019-08-29T19:42:31.4464598Z"}
+{"processed_id":22,"time":"2019-08-29T19:42:32.4501767Z"}
+{"processed_id":23,"time":"2019-08-29T19:42:33.4530692Z"}
+{"processed_id":24,"time":"2019-08-29T19:42:34.4561694Z"}
+{"processed_id":25,"time":"2019-08-29T19:42:35.4608918Z"}
+```
--- a/_examples/basic/1-your-first-app/docker-compose.yml
+++ b/_examples/basic/1-your-first-app/docker-compose.yml
@@ -0,0 +1,23 @@
+services:
+  server:
+    image: golang:1.26
+    restart: unless-stopped
+    volumes:
+    - .:/app
+    - $GOPATH/pkg/mod:/go/pkg/mod
+    working_dir: /app
+    command: >
+      /bin/sh -c "go install github.com/ThreeDotsLabs/watermill/tools/mill@latest &&
+                  go run main.go"
+
+  kafka:
+    image: redpandadata/redpanda:v26.1.7
+    restart: unless-stopped
+    command:
+      - redpanda
+      - start
+      - --kafka-addr internal://0.0.0.0:9092,external://0.0.0.0:19092
+      - --advertise-kafka-addr internal://kafka:9092,external://localhost:19092
+      - --mode dev-container
+      - --smp 1
+      - --default-log-level=warn
--- a/_examples/basic/1-your-first-app/go.mod
+++ b/_examples/basic/1-your-first-app/go.mod
@@ -0,0 +1,43 @@
+module main.go
+
+go 1.25.0
+
+require (
+	github.com/ThreeDotsLabs/watermill v1.5.1
+	github.com/ThreeDotsLabs/watermill-kafka/v3 v3.1.2
+)
+
+require (
+	github.com/IBM/sarama v1.48.1 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dnwe/otelsarama v0.0.0-20240308230250-9388d9d40bc0 // indirect
+	github.com/eapache/go-resiliency v1.7.0 // indirect
+	github.com/eapache/queue v1.1.0 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // 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/hashicorp/go-uuid v1.0.3 // indirect
+	github.com/jcmturner/aescts/v2 v2.0.0 // indirect
+	github.com/jcmturner/dnsutils/v2 v2.0.0 // indirect
+	github.com/jcmturner/gofork v1.7.6 // indirect
+	github.com/jcmturner/gokrb5/v8 v8.4.4 // indirect
+	github.com/jcmturner/rpc/v2 v2.0.3 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/lithammer/shortuuid/v3 v3.0.7 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/pierrec/lz4/v4 v4.1.26 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9 // indirect
+	github.com/sony/gobreaker v1.0.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/otel v1.43.0 // indirect
+	go.opentelemetry.io/otel/metric v1.43.0 // indirect
+	go.opentelemetry.io/otel/trace v1.43.0 // indirect
+	golang.org/x/crypto v0.51.0 // indirect
+	golang.org/x/net v0.54.0 // indirect
+	golang.org/x/sys v0.44.0 // indirect
+)
--- a/_examples/basic/1-your-first-app/go.sum
+++ b/_examples/basic/1-your-first-app/go.sum
@@ -0,0 +1,130 @@
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--- a/_examples/basic/1-your-first-app/main.go
+++ b/_examples/basic/1-your-first-app/main.go
@@ -0,0 +1,152 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/ThreeDotsLabs/watermill"
+	"github.com/ThreeDotsLabs/watermill-kafka/v3/pkg/kafka"
+	"github.com/ThreeDotsLabs/watermill/message"
+	"github.com/ThreeDotsLabs/watermill/message/router/middleware"
+	"github.com/ThreeDotsLabs/watermill/message/router/plugin"
+)
+
+var (
+	brokers      = []string{"kafka:9092"}
+	consumeTopic = "events"
+	publishTopic = "events-processed"
+
+	logger = watermill.NewStdLogger(
+		true,  // debug
+		false, // trace
+	)
+	marshaler = kafka.DefaultMarshaler{}
+)
+
+type event struct {
+	ID int `json:"id"`
+}
+
+type processedEvent struct {
+	ProcessedID int       `json:"processed_id"`
+	Time        time.Time `json:"time"`
+}
+
+func main() {
+	publisher := createPublisher()
+
+	// Subscriber is created with consumer group handler_1
+	subscriber := createSubscriber("handler_1")
+
+	router, err := message.NewRouter(message.RouterConfig{}, logger)
+	if err != nil {
+		panic(err)
+	}
+
+	router.AddPlugin(plugin.SignalsHandler)
+	router.AddMiddleware(middleware.Recoverer)
+
+	// Adding a handler (multiple handlers can be added)
+	router.AddHandler(
+		"handler_1",  // handler name, must be unique
+		consumeTopic, // topic from which messages should be consumed
+		subscriber,
+		publishTopic, // topic to which messages should be published
+		publisher,
+		func(msg *message.Message) ([]*message.Message, error) {
+			consumedPayload := event{}
+			err := json.Unmarshal(msg.Payload, &consumedPayload)
+			if err != nil {
+				// When a handler returns an error, the default behavior is to send a Nack (negative-acknowledgement).
+				// The message will be processed again.
+				//
+				// You can change the default behaviour by using middlewares, like Retry or PoisonQueue.
+				// You can also implement your own middleware.
+				return nil, err
+			}
+
+			fmt.Printf("received event %+v\n", consumedPayload)
+
+			newPayload, err := json.Marshal(processedEvent{
+				ProcessedID: consumedPayload.ID,
+				Time:        time.Now(),
+			})
+			if err != nil {
+				return nil, err
+			}
+
+			newMessage := message.NewMessage(watermill.NewUUID(), newPayload)
+
+			return []*message.Message{newMessage}, nil
+		},
+	)
+
+	// Simulate incoming events in the background
+	go simulateEvents(publisher)
+
+	if err := router.Run(context.Background()); err != nil {
+		panic(err)
+	}
+}
+
+// createPublisher is a helper function that creates a Publisher, in this case - the Kafka Publisher.
+func createPublisher() message.Publisher {
+	kafkaPublisher, err := kafka.NewPublisher(
+		kafka.PublisherConfig{
+			Brokers:   brokers,
+			Marshaler: marshaler,
+		},
+		logger,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	return kafkaPublisher
+}
+
+// createSubscriber is a helper function similar to the previous one, but in this case it creates a Subscriber.
+func createSubscriber(consumerGroup string) message.Subscriber {
+	kafkaSubscriber, err := kafka.NewSubscriber(
+		kafka.SubscriberConfig{
+			Brokers:       brokers,
+			Unmarshaler:   marshaler,
+			ConsumerGroup: consumerGroup, // every handler will use a separate consumer group
+		},
+		logger,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	return kafkaSubscriber
+}
+
+// simulateEvents produces events that will be later consumed.
+func simulateEvents(publisher message.Publisher) {
+	i := 0
+	for {
+		e := event{
+			ID: i,
+		}
+
+		payload, err := json.Marshal(e)
+		if err != nil {
+			panic(err)
+		}
+
+		err = publisher.Publish(consumeTopic, message.NewMessage(
+			watermill.NewUUID(), // internal uuid of the message, useful for debugging
+			payload,
+		))
+		if err != nil {
+			panic(err)
+		}
+
+		i++
+
+		time.Sleep(time.Second)
+	}
+}