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_examples/real-world-examples/server-sent-events-htmx/events.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
|
|
||
| "cloud.google.com/go/pubsub" | ||
| "github.com/ThreeDotsLabs/watermill" | ||
| "github.com/ThreeDotsLabs/watermill-googlecloud/pkg/googlecloud" | ||
| "github.com/ThreeDotsLabs/watermill-http/v2/pkg/http" | ||
| "github.com/ThreeDotsLabs/watermill/components/cqrs" | ||
| "github.com/ThreeDotsLabs/watermill/message" | ||
| "github.com/ThreeDotsLabs/watermill/message/router/middleware" | ||
| ) | ||
|
|
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| type PostViewed struct { | ||
| PostID int `json:"post_id"` | ||
| } | ||
|
|
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| type PostReactionAdded struct { | ||
| PostID int `json:"post_id"` | ||
| ReactionID string `json:"reaction_id"` | ||
| } | ||
|
|
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| type PostStatsUpdated struct { | ||
| PostID int `json:"post_id"` | ||
| ViewsUpdated bool `json:"views_updated"` | ||
| ReactionUpdated *string `json:"reaction_updated"` | ||
| } | ||
|
|
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| type Routers struct { | ||
| EventsRouter *message.Router | ||
| SSERouter http.SSERouter | ||
| EventBus *cqrs.EventBus | ||
| } | ||
|
|
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| func NewRouters(cfg config, repo *Repository) (Routers, error) { | ||
| logger := watermill.NewStdLogger(false, false) | ||
|
|
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| publisher, err := googlecloud.NewPublisher(googlecloud.PublisherConfig{ | ||
| ProjectID: cfg.PubSubProjectID, | ||
| }, logger) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| eventBus, err := cqrs.NewEventBusWithConfig(publisher, cqrs.EventBusConfig{ | ||
| GeneratePublishTopic: func(params cqrs.GenerateEventPublishTopicParams) (string, error) { | ||
| return params.EventName, nil | ||
| }, | ||
| Marshaler: cqrs.JSONMarshaler{}, | ||
| Logger: logger, | ||
| }) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| eventsRouter, err := message.NewRouter(message.RouterConfig{}, logger) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
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| eventsRouter.AddMiddleware(middleware.Recoverer) | ||
|
|
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| eventProcessor, err := cqrs.NewEventProcessorWithConfig(eventsRouter, cqrs.EventProcessorConfig{ | ||
| GenerateSubscribeTopic: func(params cqrs.EventProcessorGenerateSubscribeTopicParams) (string, error) { | ||
| return params.EventName, nil | ||
| }, | ||
| SubscriberConstructor: func(params cqrs.EventProcessorSubscriberConstructorParams) (message.Subscriber, error) { | ||
| return googlecloud.NewSubscriber(googlecloud.SubscriberConfig{ | ||
| ProjectID: cfg.PubSubProjectID, | ||
| GenerateSubscriptionName: func(topic string) string { | ||
| return fmt.Sprintf("%v_%v", topic, params.HandlerName) | ||
| }, | ||
| }, logger) | ||
| }, | ||
| Marshaler: cqrs.JSONMarshaler{}, | ||
| Logger: logger, | ||
| }) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| err = eventProcessor.AddHandlers( | ||
| cqrs.NewEventHandler( | ||
| "on-post-viewed", | ||
| func(ctx context.Context, event *PostViewed) error { | ||
| err = repo.UpdatePost(ctx, event.PostID, func(post *Post) { | ||
| post.Views++ | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| statsUpdated := PostStatsUpdated{ | ||
| PostID: event.PostID, | ||
| ViewsUpdated: true, | ||
| } | ||
|
|
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| return eventBus.Publish(ctx, statsUpdated) | ||
| }, | ||
| ), | ||
| cqrs.NewEventHandler( | ||
| "on-post-reaction-added", | ||
| func(ctx context.Context, event *PostReactionAdded) error { | ||
| err := repo.UpdatePost(ctx, event.PostID, func(post *Post) { | ||
| post.Reactions[event.ReactionID]++ | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
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| statsUpdated := PostStatsUpdated{ | ||
| PostID: event.PostID, | ||
| ReactionUpdated: &event.ReactionID, | ||
| } | ||
|
|
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| return eventBus.Publish(ctx, statsUpdated) | ||
| }, | ||
| ), | ||
| ) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| sseSubscriber, err := googlecloud.NewSubscriber(googlecloud.SubscriberConfig{ | ||
| ProjectID: cfg.PubSubProjectID, | ||
| GenerateSubscriptionName: func(topic string) string { | ||
| return fmt.Sprintf("%v_%v", topic, watermill.NewShortUUID()) | ||
| }, | ||
| SubscriptionConfig: pubsub.SubscriptionConfig{ | ||
| ExpirationPolicy: time.Hour * 24, | ||
| }, | ||
| }, logger) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| sseRouter, err := http.NewSSERouter(http.SSERouterConfig{ | ||
| UpstreamSubscriber: sseSubscriber, | ||
| Marshaler: http.BytesSSEMarshaler{}, | ||
| }, logger) | ||
| if err != nil { | ||
| return Routers{}, err | ||
| } | ||
|
|
||
| return Routers{ | ||
| EventsRouter: eventsRouter, | ||
| SSERouter: sseRouter, | ||
| EventBus: eventBus, | ||
| }, nil | ||
| } |
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