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aws-exchange.go
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aws-exchange.go
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package eventbus
import (
"context"
"encoding/json"
"fmt"
"strings"
"github.com/ThreeDotsLabs/watermill-amazonsqs/sns"
"github.com/ThreeDotsLabs/watermill-amazonsqs/sqs"
"github.com/aws/aws-sdk-go-v2/aws"
awsSns "github.com/aws/aws-sdk-go-v2/service/sns"
awsSqs "github.com/aws/aws-sdk-go-v2/service/sqs"
"github.com/lamassuiot/lamassuiot/v2/pkg/config"
"github.com/sirupsen/logrus"
"github.com/ThreeDotsLabs/watermill/message"
)
type SnsExchangeBuilder struct {
Config config.AWSSDKConfig
ExchangeName string
ServiceID string
Logger *logrus.Entry
}
func bindSQSToSNS(builder SnsExchangeBuilder, sqsSub *sqs.Subscriber, snsPub *sns.Publisher, topic string) error {
snsArn, err := snsPub.GetArnTopic(context.Background(), "lamassu-events")
if err != nil {
return err
}
queueName := builder.ServiceID
err = sqsSub.SubscribeInitialize(queueName)
if err != nil {
return err
}
queueUrl, err := sqsSub.GetQueueUrl(context.Background(), queueName)
if err != nil {
return err
}
queueArn, err := sqsSub.GetQueueArn(context.Background(), queueUrl)
if err != nil {
return err
}
awsConf, err := config.GetAwsSdkConfig(builder.Config)
if err != nil {
return err
}
sqsCli := awsSqs.NewFromConfig(*awsConf)
policyBuilder := func(sqsQueueArn, snsTopicArn string) (string, error) {
pMap := map[string]any{
"Version": "2012-10-17",
"Statement": []map[string]any{
{
"Effect": "Allow",
"Principal": map[string]any{
"Service": "sns.amazonaws.com",
},
"Action": "sqs:sendmessage",
"Resource": sqsQueueArn,
"Condition": map[string]any{
"ArnEquals": map[string]any{
"aws:SourceArn": snsTopicArn,
},
},
},
},
}
pBytes, err := json.Marshal(pMap)
if err != nil {
return "", err
}
return string(pBytes), nil
}
policy, err := policyBuilder(*queueArn, *snsArn)
if err != nil {
return err
}
subAttributes := map[string]string{
"RawMessageDelivery": "true",
}
if topic != "#" {
var filterPolicy map[string]any
if !strings.Contains(topic, "#") {
filterPolicy = map[string]any{
"type": []string{topic},
}
} else {
if strings.HasSuffix(topic, "#") {
topic, _ = strings.CutSuffix(topic, "#")
filterPolicy = map[string]any{
"type": []any{
map[string]any{
"prefix": topic,
},
},
}
}
}
filterPolicyJSON, err := json.Marshal(filterPolicy)
if err != nil {
fmt.Println("error marshalling filter policy:", err)
return err
}
subAttributes["FilterPolicy"] = string(filterPolicyJSON)
subAttributes["FilterPolicyScope"] = "MessageBody"
}
_, err = sqsCli.SetQueueAttributes(context.Background(), &awsSqs.SetQueueAttributesInput{
QueueUrl: queueUrl,
Attributes: map[string]string{
"Policy": policy,
},
})
if err != nil {
return err
}
err = snsPub.AddSubscription(context.Background(), &awsSns.SubscribeInput{
TopicArn: snsArn,
Protocol: aws.String("sqs"),
Endpoint: queueArn,
Attributes: subAttributes,
})
if err != nil {
return err
}
return nil
}
type exchangeSqsSubscriber struct {
builderConf SnsExchangeBuilder
sqsSub *sqs.Subscriber
}
func (s *exchangeSqsSubscriber) Subscribe(ctx context.Context, topic string) (<-chan *message.Message, error) {
pub, err := NewSnsExchangePublisher(s.builderConf)
if err != nil {
return nil, err
}
defer pub.Close()
sqsSub, err := NewAwsSqsSub(s.builderConf.Config, s.builderConf.ServiceID, s.builderConf.Logger)
if err != nil {
return nil, err
}
err = bindSQSToSNS(s.builderConf, sqsSub, pub.getRawSNSPublisher(), topic)
if err != nil {
return nil, err
}
s.sqsSub = sqsSub
queueName := s.builderConf.ServiceID
return sqsSub.Subscribe(ctx, queueName)
}
type SnsExchangeSubscriber struct {
}
// Close should flush unsent messages, if publisher is async.
func (s *exchangeSqsSubscriber) Close() error {
return s.sqsSub.Close()
}
func NewSnsExchangeSubscriber(builder SnsExchangeBuilder) message.Subscriber {
return &exchangeSqsSubscriber{
builderConf: builder,
}
}
type SnsExchangePublisher struct {
builderConf SnsExchangeBuilder
sns *sns.Publisher
}
func (s *SnsExchangePublisher) Publish(topic string, messages ...*message.Message) error {
return s.sns.Publish(s.builderConf.ExchangeName, messages...)
}
func (s *SnsExchangePublisher) Close() error {
return s.sns.Close()
}
func (s *SnsExchangePublisher) getRawSNSPublisher() *sns.Publisher {
return s.sns
}
func NewSnsExchangePublisher(builder SnsExchangeBuilder) (*SnsExchangePublisher, error) {
awsConf, err := config.GetAwsSdkConfig(builder.Config)
if err != nil {
return nil, err
}
lEventBusPub := newWithLogger(builder.Logger.WithField("subsystem-provider", "AWS.SNS - Publisher"))
pub, err := sns.NewPublisher(sns.PublisherConfig{
AWSConfig: *awsConf,
CreateTopicfNotExists: true,
CreateTopicConfig: sns.SNSConfigAtrributes{
DisplayName: builder.ExchangeName,
},
}, lEventBusPub)
if err != nil {
return nil, err
}
return &SnsExchangePublisher{
sns: pub,
builderConf: builder,
}, nil
}