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//go:build gocdk
// +build gocdk
package sub
import (
"context"
"github.com/golang/protobuf/proto"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
"github.com/streadway/amqp"
"gocloud.dev/pubsub"
_ "gocloud.dev/pubsub/awssnssqs"
"gocloud.dev/pubsub/rabbitpubsub"
"net/url"
"os"
"path"
"strings"
"time"
// _ "gocloud.dev/pubsub/azuresb"
_ "gocloud.dev/pubsub/gcppubsub"
_ "gocloud.dev/pubsub/natspubsub"
_ "gocloud.dev/pubsub/rabbitpubsub"
)
func init() {
NotificationInputs = append(NotificationInputs, &GoCDKPubSubInput{})
}
func getPath(rawUrl string) string {
parsedUrl, _ := url.Parse(rawUrl)
return path.Join(parsedUrl.Host, parsedUrl.Path)
}
func QueueDeclareAndBind(conn *amqp.Connection, exchangeUrl string, queueUrl string) error {
exchangeName := getPath(exchangeUrl)
queueName := getPath(queueUrl)
exchangeNameDLX := "DLX." + exchangeName
queueNameDLX := "DLX." + queueName
ch, err := conn.Channel()
if err != nil {
glog.Error(err)
return err
}
defer ch.Close()
if err := ch.ExchangeDeclare(
exchangeNameDLX, "fanout", true, false, false, false, nil); err != nil {
glog.Error(err)
return err
}
if err := ch.ExchangeDeclare(
exchangeName, "fanout", true, false, false, false, nil); err != nil {
glog.Error(err)
return err
}
if _, err := ch.QueueDeclare(
queueName, true, false, false, false,
amqp.Table{"x-dead-letter-exchange": exchangeNameDLX}); err != nil {
glog.Error(err)
return err
}
if err := ch.QueueBind(queueName, "", exchangeName, false, nil); err != nil {
glog.Error(err)
return err
}
if _, err := ch.QueueDeclare(
queueNameDLX, true, false, false, false,
amqp.Table{"x-dead-letter-exchange": exchangeName, "x-message-ttl": 600000}); err != nil {
glog.Error(err)
return err
}
if err := ch.QueueBind(queueNameDLX, "", exchangeNameDLX, false, nil); err != nil {
glog.Error(err)
return err
}
return nil
}
type GoCDKPubSubInput struct {
sub *pubsub.Subscription
subURL string
}
func (k *GoCDKPubSubInput) GetName() string {
return "gocdk_pub_sub"
}
func (k *GoCDKPubSubInput) Initialize(configuration util.Configuration, prefix string) error {
topicUrl := configuration.GetString(prefix + "topic_url")
k.subURL = configuration.GetString(prefix + "sub_url")
glog.V(0).Infof("notification.gocdk_pub_sub.sub_url: %v", k.subURL)
sub, err := pubsub.OpenSubscription(context.Background(), k.subURL)
if err != nil {
return err
}
var conn *amqp.Connection
if sub.As(&conn) {
ch, err := conn.Channel()
if err != nil {
return err
}
defer ch.Close()
_, err = ch.QueueInspect(getPath(k.subURL))
if err != nil {
if strings.HasPrefix(err.Error(), "Exception (404) Reason") {
if err := QueueDeclareAndBind(conn, topicUrl, k.subURL); err != nil {
return err
}
} else {
return err
}
}
}
k.sub = sub
return nil
}
func (k *GoCDKPubSubInput) ReceiveMessage() (key string, message *filer_pb.EventNotification, onSuccessFn func(), onFailureFn func(), err error) {
ctx := context.Background()
msg, err := k.sub.Receive(ctx)
if err != nil {
var conn *amqp.Connection
if k.sub.As(&conn) && conn.IsClosed() {
conn.Close()
k.sub.Shutdown(ctx)
conn, err = amqp.Dial(os.Getenv("RABBIT_SERVER_URL"))
if err != nil {
glog.Error(err)
time.Sleep(time.Second)
return
}
k.sub = rabbitpubsub.OpenSubscription(conn, getPath(k.subURL), nil)
return
}
// This is permanent cached sub err
glog.Fatal(err)
}
onFailureFn = func() {
if msg.Nackable() {
isRedelivered := false
var delivery amqp.Delivery
if msg.As(&delivery) {
isRedelivered = delivery.Redelivered
glog.Warningf("onFailureFn() metadata: %+v, redelivered: %v", msg.Metadata, delivery.Redelivered)
}
if isRedelivered {
if err := delivery.Nack(false, false); err != nil {
glog.Error(err)
}
} else {
msg.Nack()
}
}
}
onSuccessFn = func() {
msg.Ack()
}
key = msg.Metadata["key"]
message = &filer_pb.EventNotification{}
err = proto.Unmarshal(msg.Body, message)
if err != nil {
return "", nil, onSuccessFn, onFailureFn, err
}
return key, message, onSuccessFn, onFailureFn, nil
}
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