diff --git a/_examples/postcard/cmd/main.go b/_examples/postcard/cmd/main.go new file mode 100644 index 0000000..8ab3b8d --- /dev/null +++ b/_examples/postcard/cmd/main.go @@ -0,0 +1,133 @@ +package main + +import ( + "context" + "database/sql" + "fmt" + "log" + + "github.com/ThreeDotsLabs/watermill" + "github.com/ThreeDotsLabs/watermill-amqp/pkg/amqp" + sql2 "github.com/ThreeDotsLabs/watermill-sql/pkg/sql" + "github.com/ThreeDotsLabs/watermill/components/forwarder" + "github.com/ThreeDotsLabs/watermill/message" + "github.com/google/uuid" + _ "github.com/lib/pq" + + "postcard" + "postcard/storage" +) + +func main() { + conn := "host=localhost port=5432 user=postgres password=password dbname=postgres sslmode=disable" + db, err := sql.Open("postgres", conn) + if err != nil { + log.Fatal(err) + } + + repo, err := storage.NewDefaultSimplePostcardRepository(context.Background(), db) + if err != nil { + log.Fatal(err) + } + + logger := watermill.NewStdLogger(false, false) + + router, err := message.NewRouter(message.RouterConfig{}, logger) + if err != nil { + log.Fatal(err) + } + + sqlSub, err := sql2.NewSubscriber(db, sql2.SubscriberConfig{ + SchemaAdapter: storage.WatermillSchemaAdapter{}, + OffsetsAdapter: sql2.DefaultPostgreSQLOffsetsAdapter{}, + InitializeSchema: true, + }, logger) + + amqpURI := "amqp://guest:guest@localhost:5672/" + amqpConfig := amqp.NewDurablePubSubConfig(amqpURI, func(topic string) string { + return topic + }) + + amqpPub, err := amqp.NewPublisher(amqpConfig, logger) + if err != nil { + log.Fatal(err) + } + + amqpSub, err := amqp.NewSubscriber(amqpConfig, logger) + if err != nil { + log.Fatal(err) + } + + router.AddHandler( + "sql-to-amqp", + "events", + sqlSub, + "events", + amqpPub, + func(msg *message.Message) ([]*message.Message, error) { + return []*message.Message{msg}, nil + }, + ) + + router.AddNoPublisherHandler( + "read-amqp", + "events", + amqpSub, + func(msg *message.Message) error { + fmt.Printf("Received message %v: %v\n", msg.UUID, string(msg.Payload)) + return nil + }, + ) + + fwd, err := forwarder.NewForwarder(sqlSub, amqpPub, logger, forwarder.Config{ + ForwarderTopic: "events", + }) + if err != nil { + log.Fatal(err) + } + + go func() { + err := fwd.Run(context.Background()) + if err != nil { + log.Fatal(err) + } + }() + + go func() { + err = router.Run(context.Background()) + if err != nil { + log.Fatal(err) + } + }() + + <-fwd.Running() + <-router.Running() + + pc, err := postcard.NewPostcard(uuid.NewString()) + if err != nil { + log.Fatal(err) + } + + err = repo.Save(context.Background(), pc) + if err != nil { + log.Fatal(err) + } + + err = pc.Address(postcard.Address{ + Name: "Someone", + Line1: "Somewhere", + }, postcard.Address{ + Name: "Who", + Line1: "Where", + }) + if err != nil { + log.Fatal(err) + } + + err = repo.Save(context.Background(), pc) + if err != nil { + log.Fatal(err) + } + + select {} +} diff --git a/_examples/postcard/docker-compose.yml b/_examples/postcard/docker-compose.yml new file mode 100644 index 0000000..94999eb --- /dev/null +++ b/_examples/postcard/docker-compose.yml @@ -0,0 +1,14 @@ +version: '3' +services: + postgres: + image: postgres + environment: + - POSTGRES_PASSWORD=password + - POSTGRES_DB=esja + ports: + - "5432:5432" + + rabbitmq: + image: rabbitmq:3.7-management + ports: + - 5672:5672 diff --git a/_examples/postcard/go.mod b/_examples/postcard/go.mod index 33f18a3..45a88ea 100644 --- a/_examples/postcard/go.mod +++ b/_examples/postcard/go.mod @@ -4,6 +4,10 @@ go 1.18 require ( github.com/ThreeDotsLabs/esja v0.0.0-20221208191400-8fbb493947e7 + github.com/ThreeDotsLabs/pii v0.0.0-20230103125711-e0908da9a963 + github.com/ThreeDotsLabs/watermill v1.2.0-rc.11 + github.com/ThreeDotsLabs/watermill-amqp v1.1.4 + github.com/ThreeDotsLabs/watermill-sql v1.3.7 github.com/google/uuid v1.3.0 github.com/lib/pq v1.10.6 github.com/mattn/go-sqlite3 v1.14.16 @@ -11,9 +15,15 @@ require ( ) require ( - github.com/ThreeDotsLabs/pii v0.0.0-20230103125711-e0908da9a963 // indirect + github.com/cenkalti/backoff/v3 v3.2.2 // indirect github.com/davecgh/go-spew v1.1.1 // indirect + github.com/hashicorp/errwrap v1.0.0 // 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/pmezard/go-difflib v1.0.0 // indirect + github.com/streadway/amqp v1.0.0 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect ) diff --git a/_examples/postcard/go.sum b/_examples/postcard/go.sum index acabb5d..7a1b858 100644 --- a/_examples/postcard/go.sum +++ b/_examples/postcard/go.sum @@ -1,27 +1,242 @@ -github.com/ThreeDotsLabs/pii v0.0.0-20221221144555-f2186024b30d h1:bZBc4vDne17OYqoeSceaq5eaZM6vOUMVaJIBy+dNRH4= -github.com/ThreeDotsLabs/pii v0.0.0-20221221144555-f2186024b30d/go.mod h1:wu5cEZEjFUIXR9hdniDvGbbZARrYHTRi6G2bNaSCC/E= +github.com/BurntSushi/toml v0.3.1/go.mod 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h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= diff --git a/_examples/postcard/storage/watermill.go b/_examples/postcard/storage/watermill.go new file mode 100644 index 0000000..9692d03 --- /dev/null +++ b/_examples/postcard/storage/watermill.go @@ -0,0 +1,55 @@ +package storage + +import ( + "database/sql" + "errors" + + "github.com/google/uuid" + + sql2 "github.com/ThreeDotsLabs/watermill-sql/pkg/sql" + "github.com/ThreeDotsLabs/watermill/message" +) + +type WatermillSchemaAdapter struct{} + +func (s WatermillSchemaAdapter) SchemaInitializingQueries(topic string) []string { + return nil +} + +func (s WatermillSchemaAdapter) InsertQuery(topic string, msgs message.Messages) (string, []interface{}, error) { + return "", nil, errors.New("not supported") +} + +func (s WatermillSchemaAdapter) SelectQuery(topic string, consumerGroup string, offsetsAdapter sql2.OffsetsAdapter) (string, []interface{}) { + nextOffsetQuery, nextOffsetArgs := offsetsAdapter.NextOffsetQuery(topic, consumerGroup) + selectQuery := ` + SELECT id, stream_id, event_payload FROM events + WHERE + id > (` + nextOffsetQuery + `) + ORDER BY + id ASC + LIMIT 1` + + return selectQuery, nextOffsetArgs +} + +type schemaRow struct { + ID int64 + StreamID []byte + Payload []byte +} + +func (s WatermillSchemaAdapter) UnmarshalMessage(row *sql.Row) (offset int, msg *message.Message, err error) { + r := schemaRow{} + err = row.Scan(&r.ID, &r.StreamID, &r.Payload) + if err != nil { + return 0, nil, err + } + + // TODO Event UUID? + msg = message.NewMessage(uuid.NewString(), r.Payload) + + // TODO Metadata? + + return int(r.ID), msg, nil +}