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🚜 Refactor event handling and print handlers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| package events | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "github.com/ThreeDotsLabs/watermill" | ||
| "github.com/ThreeDotsLabs/watermill/message" | ||
| "github.com/rs/zerolog/log" | ||
| "sync" | ||
| ) | ||
|
|
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| // NOTE(manuel, 2024-03-24) This might be worth moving / integrating into the event router | ||
| // It sounds also logical that this is the thing that would add sequence numbers to events? | ||
|
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| // PublisherManager is used to distribute messages to a set of Publishers. | ||
| // As such, you "subscribe" a publisher to the given topic. | ||
| // When you Publish a message, it will get distributed to all publishers | ||
| // on the channel they were subscribed with. | ||
| // | ||
| // The Manager also keeps a sequence number for each outgoing message, | ||
| // in the order they are handled by Publish. | ||
| type PublisherManager struct { | ||
| Publishers map[string][]message.Publisher | ||
| sequenceNumber uint64 | ||
| mutex sync.Mutex | ||
| } | ||
|
|
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| func NewPublisherManager() *PublisherManager { | ||
| return &PublisherManager{ | ||
| Publishers: make(map[string][]message.Publisher), | ||
| } | ||
| } | ||
|
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| func (s *PublisherManager) SubscribePublisher(topic string, sub message.Publisher) { | ||
| s.mutex.Lock() | ||
| defer s.mutex.Unlock() | ||
| s.Publishers[topic] = append(s.Publishers[topic], sub) | ||
| } | ||
|
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| // Publish distributes a message to all Publishers across all topics. | ||
| // Serializing the payload to JSON is done by Publish itself. | ||
| // | ||
| // Returns an error for any processing or distribution issues. | ||
| func (s *PublisherManager) Publish(payload interface{}) error { | ||
| // lock for the sequence number hash | ||
| s.mutex.Lock() | ||
| defer s.mutex.Unlock() | ||
|
|
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| b, err := json.Marshal(payload) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| msg := message.NewMessage(watermill.NewUUID(), b) | ||
| msg.Metadata.Set("sequence_number", fmt.Sprintf("%d", s.sequenceNumber)) | ||
| s.sequenceNumber++ | ||
|
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| for topic, subs := range s.Publishers { | ||
| for _, sub := range subs { | ||
| err = sub.Publish(topic, msg) | ||
| if err != nil { | ||
| log.Warn().Err(err).Msg("failed to publish") | ||
| } | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (s *PublisherManager) PublishBlind(payload interface{}) { | ||
| err := s.Publish(payload) | ||
| if err != nil { | ||
| log.Warn().Err(err).Msg("failed to publish") | ||
| } | ||
| } |
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