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104 lines
2.8 KiB
104 lines
2.8 KiB
// Package gocdk_pub_sub supports the Go CDK (Cloud Development Kit) PubSub API,
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// which in turn supports many providers, including Amazon SNS/SQS, Azure Service Bus,
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// Google Cloud PubSub, and RabbitMQ.
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//
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// In the config, select a provider and topic using a URL. See
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// https://godoc.org/gocloud.dev/pubsub and its sub-packages for details.
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//
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// The Go CDK PubSub API does not support administrative operations like topic
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// creation. Create the topic using a UI, CLI or provider-specific API before running
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// weed.
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//
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// The Go CDK obtains credentials via environment variables and other
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// provider-specific default mechanisms. See the provider's documentation for
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// details.
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package gocdk_pub_sub
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import (
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"context"
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"fmt"
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"github.com/golang/protobuf/proto"
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"github.com/streadway/amqp"
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"gocloud.dev/pubsub"
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_ "gocloud.dev/pubsub/awssnssqs"
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"gocloud.dev/pubsub/rabbitpubsub"
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"net/url"
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"path"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/notification"
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"github.com/chrislusf/seaweedfs/weed/util"
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// _ "gocloud.dev/pubsub/azuresb"
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_ "gocloud.dev/pubsub/gcppubsub"
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_ "gocloud.dev/pubsub/natspubsub"
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_ "gocloud.dev/pubsub/rabbitpubsub"
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"os"
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)
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func init() {
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notification.MessageQueues = append(notification.MessageQueues, &GoCDKPubSub{})
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}
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func getPath(rawUrl string) string {
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parsedUrl, _ := url.Parse(rawUrl)
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return path.Join(parsedUrl.Host, parsedUrl.Path)
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}
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type GoCDKPubSub struct {
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topicURL string
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topic *pubsub.Topic
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}
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func (k *GoCDKPubSub) GetName() string {
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return "gocdk_pub_sub"
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}
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func (k *GoCDKPubSub) doReconnect() {
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var conn *amqp.Connection
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if k.topic.As(&conn) {
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go func() {
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<-conn.NotifyClose(make(chan *amqp.Error))
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conn.Close()
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k.topic.Shutdown(context.Background())
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for {
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glog.Info("Try reconnect")
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conn, err := amqp.Dial(os.Getenv("RABBIT_SERVER_URL"))
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if err == nil {
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k.topic = rabbitpubsub.OpenTopic(conn, getPath(k.topicURL), nil)
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k.doReconnect()
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break
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}
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glog.Error(err)
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time.Sleep(time.Second)
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}
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}()
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}
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}
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func (k *GoCDKPubSub) Initialize(configuration util.Configuration, prefix string) error {
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k.topicURL = configuration.GetString(prefix + "topic_url")
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glog.V(0).Infof("notification.gocdk_pub_sub.topic_url: %v", k.topicURL)
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topic, err := pubsub.OpenTopic(context.Background(), k.topicURL)
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if err != nil {
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glog.Fatalf("Failed to open topic: %v", err)
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}
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k.topic = topic
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k.doReconnect()
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return nil
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}
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func (k *GoCDKPubSub) SendMessage(key string, message proto.Message) error {
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bytes, err := proto.Marshal(message)
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if err != nil {
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return err
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}
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err = k.topic.Send(context.Background(), &pubsub.Message{
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Body: bytes,
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Metadata: map[string]string{"key": key},
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})
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if err != nil {
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return fmt.Errorf("send message via Go CDK pubsub %s: %v", k.topicURL, err)
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}
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return nil
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}
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