Add an in-process post event bus.

internal/web/events.go

@@ -0,0 +1,65 @@
+package web
+
+import (
+	"context"
+
+	"plumber/internal/events"
+	"plumber/internal/store"
+)
+
+func (s *Server) publishPostCreated(post, root *store.Post, author *store.User) {
+	s.publishPost(events.PostCreated{PostEvent: s.postEvent(post, root, author)}, root)
+}
+
+func (s *Server) publishPostUpdated(post, root *store.Post, author *store.User) {
+	s.publishPost(events.PostUpdated{PostEvent: s.postEvent(post, root, author)}, root)
+}
+
+func (s *Server) publishPost(ev any, root *store.Post) {
+	if root != nil && root.PostState == store.PostStateHidden {
+		return
+	}
+	s.cfg.Events.Publish(context.Background(), ev)
+}
+
+func (s *Server) postEvent(post, root *store.Post, author *store.User) events.PostEvent {
+	if post == nil {
+		return events.PostEvent{}
+	}
+	rootID := post.ID
+	if root != nil {
+		rootID = root.ID
+	}
+	ev := events.PostEvent{
+		PostID:     post.ID,
+		RootID:     rootID,
+		Title:      post.Title,
+		Body:       post.Body,
+		City:       post.City,
+		AuthorID:   post.AuthorID,
+		AuthorName: post.AuthorName,
+		AuthorRole: string(post.AuthorRole),
+		Permalink:  events.Permalink(s.cfg.BaseURL, rootID, post.ID),
+	}
+	if post.ParentID != nil {
+		ev.ParentID = *post.ParentID
+	}
+	if author != nil {
+		if ev.AuthorName == "" {
+			ev.AuthorName = author.Name
+		}
+		if ev.AuthorRole == "" {
+			ev.AuthorRole = string(author.Role)
+		}
+	}
+	if n := len(post.Images); n > 0 {
+		ev.Images = make([]events.Image, 0, n)
+		for _, img := range post.Images {
+			ev.Images = append(ev.Images, events.Image{
+				URL:         img.PublicURL,
+				Description: img.Description,
+			})
+		}
+	}
+	return ev
+}