96 lines
1.8 KiB
Go
96 lines
1.8 KiB
Go
// Sources for https://watermill.io/learn/getting-started/
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package main
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import (
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"context"
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stdSQL "database/sql"
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"log"
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"time"
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driver "github.com/go-sql-driver/mysql"
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"github.com/ThreeDotsLabs/watermill"
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"github.com/ThreeDotsLabs/watermill-sql/v4/pkg/sql"
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"github.com/ThreeDotsLabs/watermill/message"
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)
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func main() {
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db := createDB()
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logger := watermill.NewStdLogger(false, false)
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subscriber, err := sql.NewSubscriber(
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sql.BeginnerFromStdSQL(db),
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sql.SubscriberConfig{
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SchemaAdapter: sql.DefaultMySQLSchema{},
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OffsetsAdapter: sql.DefaultMySQLOffsetsAdapter{},
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InitializeSchema: true,
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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messages, err := subscriber.Subscribe(context.Background(), "example_topic")
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if err != nil {
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panic(err)
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}
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go process(messages)
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publisher, err := sql.NewPublisher(
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sql.BeginnerFromStdSQL(db),
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sql.PublisherConfig{
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SchemaAdapter: sql.DefaultMySQLSchema{},
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},
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logger,
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)
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if err != nil {
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panic(err)
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}
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publishMessages(publisher)
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}
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func createDB() *stdSQL.DB {
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conf := driver.NewConfig()
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conf.Net = "tcp"
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conf.User = "root"
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conf.Addr = "mysql"
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conf.DBName = "watermill"
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db, err := stdSQL.Open("mysql", conf.FormatDSN())
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if err != nil {
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panic(err)
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}
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err = db.Ping()
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if err != nil {
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panic(err)
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}
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return db
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}
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func publishMessages(publisher message.Publisher) {
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for {
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msg := message.NewMessage(watermill.NewUUID(), []byte(`{"message": "Hello, world!"}`))
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if err := publisher.Publish("example_topic", msg); err != nil {
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panic(err)
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}
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time.Sleep(time.Second)
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}
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}
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func process(messages <-chan *message.Message) {
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for msg := range messages {
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log.Printf("received message: %s, payload: %s", msg.UUID, string(msg.Payload))
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// we need to Acknowledge that we received and processed the message,
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// otherwise, it will be resent over and over again.
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msg.Ack()
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}
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}
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