134 lines
3.1 KiB
Go
134 lines
3.1 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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"fmt"
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"log"
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"net/url"
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"time"
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"github.com/aws/aws-sdk-go-v2/aws"
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amazonsns "github.com/aws/aws-sdk-go-v2/service/sns"
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amazonsqs "github.com/aws/aws-sdk-go-v2/service/sqs"
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transport "github.com/aws/smithy-go/endpoints"
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"github.com/samber/lo"
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"github.com/ThreeDotsLabs/watermill"
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"github.com/ThreeDotsLabs/watermill-aws/sns"
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"github.com/ThreeDotsLabs/watermill-aws/sqs"
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"github.com/ThreeDotsLabs/watermill/message"
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)
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func main() {
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logger := watermill.NewStdLogger(false, false)
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snsOpts := []func(*amazonsns.Options){
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amazonsns.WithEndpointResolverV2(sns.OverrideEndpointResolver{
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Endpoint: transport.Endpoint{
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URI: *lo.Must(url.Parse("http://localstack:4566")),
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},
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}),
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}
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sqsOpts := []func(*amazonsqs.Options){
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amazonsqs.WithEndpointResolverV2(sqs.OverrideEndpointResolver{
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Endpoint: transport.Endpoint{
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URI: *lo.Must(url.Parse("http://localstack:4566")),
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},
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}),
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}
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topicResolver, err := sns.NewGenerateArnTopicResolver("000000000000", "us-east-1")
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if err != nil {
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panic(err)
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}
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newSubscriber := func(name string) (message.Subscriber, error) {
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subscriberConfig := sns.SubscriberConfig{
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AWSConfig: aws.Config{
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Credentials: aws.AnonymousCredentials{},
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},
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OptFns: snsOpts,
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TopicResolver: topicResolver,
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GenerateSqsQueueName: func(ctx context.Context, snsTopic sns.TopicArn) (string, error) {
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topic, err := sns.ExtractTopicNameFromTopicArn(snsTopic)
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if err != nil {
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return "", err
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}
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return fmt.Sprintf("%v-%v", topic, name), nil
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},
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}
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sqsSubscriberConfig := sqs.SubscriberConfig{
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AWSConfig: aws.Config{
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Credentials: aws.AnonymousCredentials{},
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},
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OptFns: sqsOpts,
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}
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return sns.NewSubscriber(subscriberConfig, sqsSubscriberConfig, logger)
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}
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subA, err := newSubscriber("subA")
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if err != nil {
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panic(err)
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}
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subB, err := newSubscriber("subB")
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if err != nil {
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panic(err)
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}
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messagesA, err := subA.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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messagesB, err := subB.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("A", messagesA)
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go process("B", messagesB)
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publisherConfig := sns.PublisherConfig{
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AWSConfig: aws.Config{
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Credentials: aws.AnonymousCredentials{},
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},
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OptFns: snsOpts,
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TopicResolver: topicResolver,
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}
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publisher, err := sns.NewPublisher(publisherConfig, logger)
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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 publishMessages(publisher message.Publisher) {
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for {
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msg := message.NewMessage(watermill.NewUUID(), []byte("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(prefix string, messages <-chan *message.Message) {
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for msg := range messages {
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log.Printf("%v received message: %s, payload: %s", prefix, 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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