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package webhook
import (
"context"
"errors"
"fmt"
"time"
"github.com/ThreeDotsLabs/watermill"
"github.com/ThreeDotsLabs/watermill/message"
"github.com/ThreeDotsLabs/watermill/message/router/middleware"
"github.com/ThreeDotsLabs/watermill/message/router/plugin"
"github.com/ThreeDotsLabs/watermill/pubsub/gochannel"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/notification"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
"google.golang.org/protobuf/proto"
)
func init() {
notification.MessageQueues = append(notification.MessageQueues, &Queue{})
}
type Queue struct {
router *message.Router
queueChannel *gochannel.GoChannel
config *config
client client
filter *filter
ctx context.Context
cancel context.CancelFunc
}
func (w *Queue) GetName() string {
return queueName
}
func (w *Queue) SendMessage(key string, msg proto.Message) error {
eventNotification, ok := msg.(*filer_pb.EventNotification)
if !ok {
return nil
}
if w.filter != nil && !w.filter.shouldPublish(key, eventNotification) {
return nil
}
m := newWebhookMessage(key, msg)
if m == nil {
return nil
}
wMsg, err := m.toWaterMillMessage()
if err != nil {
return err
}
return w.queueChannel.Publish(pubSubTopicName, wMsg)
}
func (w *webhookMessage) toWaterMillMessage() (*message.Message, error) {
payload, err := proto.Marshal(w.Notification)
if err != nil {
return nil, err
}
msg := message.NewMessage(watermill.NewUUID(), payload)
// Set event type and key as metadata
msg.Metadata.Set("event_type", w.EventType)
msg.Metadata.Set("key", w.Key)
return msg, nil
}
func (w *Queue) Initialize(configuration util.Configuration, prefix string) error {
c := newConfigWithDefaults(configuration, prefix)
if err := c.validate(); err != nil {
return err
}
return w.initialize(c)
}
func (w *Queue) initialize(cfg *config) error {
w.ctx, w.cancel = context.WithCancel(context.Background())
w.config = cfg
w.filter = newFilter(cfg)
hClient, err := newHTTPClient(cfg)
if err != nil {
return fmt.Errorf("failed to create webhook http client: %w", err)
}
w.client = hClient
if err = w.setupWatermillQueue(cfg); err != nil {
return fmt.Errorf("failed to setup watermill queue: %w", err)
}
if err = w.logDeadLetterMessages(); err != nil {
return err
}
return nil
}
func (w *Queue) setupWatermillQueue(cfg *config) error {
logger := watermill.NewStdLogger(false, false)
pubSubConfig := gochannel.Config{
OutputChannelBuffer: int64(cfg.bufferSize),
Persistent: false,
}
w.queueChannel = gochannel.NewGoChannel(pubSubConfig, logger)
router, err := message.NewRouter(
message.RouterConfig{
CloseTimeout: 60 * time.Second,
},
logger,
)
if err != nil {
return fmt.Errorf("failed to create router: %w", err)
}
w.router = router
retryMiddleware := middleware.Retry{
MaxRetries: cfg.maxRetries,
InitialInterval: time.Duration(cfg.backoffSeconds) * time.Second,
MaxInterval: time.Duration(cfg.maxBackoffSeconds) * time.Second,
Multiplier: 2.0,
RandomizationFactor: 0.3,
Logger: logger,
}.Middleware
poisonQueue, err := middleware.PoisonQueue(w.queueChannel, deadLetterTopic)
if err != nil {
return fmt.Errorf("failed to create poison queue: %w", err)
}
router.AddPlugin(plugin.SignalsHandler)
router.AddMiddleware(retryMiddleware, poisonQueue)
for i := 0; i < cfg.nWorkers; i++ {
router.AddNoPublisherHandler(
pubSubHandlerNameTemplate(i),
pubSubTopicName,
w.queueChannel,
w.handleWebhook,
)
}
go func() {
// cancels the queue context so the dead letter logger exists in case context not canceled by the shutdown signal already
defer w.cancel()
if err := router.Run(w.ctx); err != nil && !errors.Is(err, context.Canceled) {
glog.Errorf("webhook pubsub worker stopped with error: %v", err)
}
glog.Info("webhook pubsub worker stopped")
}()
return nil
}
func (w *Queue) handleWebhook(msg *message.Message) error {
var n filer_pb.EventNotification
if err := proto.Unmarshal(msg.Payload, &n); err != nil {
glog.Errorf("failed to unmarshal protobuf message: %v", err)
return err
}
// Reconstruct webhook message from metadata and payload
webhookMsg := &webhookMessage{
Key: msg.Metadata.Get("key"),
EventType: msg.Metadata.Get("event_type"),
Notification: &n,
}
if err := w.client.sendMessage(webhookMsg); err != nil {
glog.Errorf("failed to send message to webhook %s: %v", webhookMsg.Key, err)
return err
}
return nil
}
func (w *Queue) logDeadLetterMessages() error {
ch, err := w.queueChannel.Subscribe(w.ctx, deadLetterTopic)
if err != nil {
return err
}
go func() {
for {
select {
case msg, ok := <-ch:
if !ok {
glog.Info("dead letter channel closed")
return
}
if msg == nil {
glog.Errorf("received nil message from dead letter channel")
continue
}
key := "unknown"
if msg.Metadata != nil {
if keyValue, exists := msg.Metadata["key"]; exists {
key = keyValue
}
}
payload := ""
if msg.Payload != nil {
var n filer_pb.EventNotification
if err := proto.Unmarshal(msg.Payload, &n); err != nil {
payload = fmt.Sprintf("failed to unmarshal payload: %v", err)
} else {
payload = n.String()
}
}
glog.Errorf("received dead letter message: %s, key: %s", payload, key)
case <-w.ctx.Done():
return
}
}
}()
return nil
}
|
