Rearrange repo as monorepo

httputils/event.go

@@ -0,0 +1,12 @@
+package httputils
+
+import "fmt"
+
+type SseEvent struct {
+	EventName string
+	Data      string
+}
+
+func (event SseEvent) Encode() string {
+	return fmt.Sprintf("event: %s\ndata: %s\n\n", event.EventName, event.Data)
+}

httputils/handler.go

@@ -0,0 +1,50 @@
+package httputils
+
+import (
+	"fmt"
+	"net/http"
+	"text/template"
+)
+
+type Handler = func(http.ResponseWriter, *http.Request)
+
+func GenerateHandler(
+	file string,
+	handler func(http.ResponseWriter, *http.Request),
+	data func(http.ResponseWriter, *http.Request) any,
+	methods []string,
+) Handler {
+	var tmpl *template.Template
+	if file != "" {
+		tmpl = template.Must(template.ParseFiles(fmt.Sprintf("templates/%s", file)))
+	}
+	return func(w http.ResponseWriter, r *http.Request) {
+		for _, method := range methods {
+			if method == r.Method {
+				goto ok
+			}
+		}
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	ok:
+		handler(w, r)
+		if tmpl != nil {
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			tmpl.Execute(w, data(w, r))
+		}
+	}
+}
+
+func GenerateSseHandler(handler Handler) Handler {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		w.Header().Set("Content-Type", "text/event-stream")
+		w.Header().Set("Cache-Control", "no-cache")
+		w.Header().Set("Connection", "keep-alive")
+		w.WriteHeader(http.StatusOK)
+		handler(w, r)
+	}
+}