feat(tfstated): bootstrap webui listening on a second port

cmd/tfstated/main.go

@@ -26,7 +26,8 @@ func run(
 		return err
 	}
 
-	backend := backend.Run(ctx, db, getenv, stderr)
+	backend := backend.Run(ctx, db, getenv)
+	webui := webui.Run(ctx, db, getenv)
 
 	<-ctx.Done()
 	shutdownCtx := context.Background()
@@ -34,13 +35,17 @@ func run(
 	defer shutdownCancel()
 
 	var wg sync.WaitGroup
-	wg.Add(1)
+	wg.Add(2)
 	go func() {
 		defer wg.Done()
 		if err := backend.Shutdown(shutdownCtx); err != nil {
 			slog.Error("error shutting down backend http server", "error", err)
 		}
 	}()
+	go func() {
+		defer wg.Done()
+		if err := webui.Shutdown(shutdownCtx); err != nil {
+			slog.Error("error shutting down webui http server", "error", err)
 		}
 	}()
 	wg.Wait()

pkg/webui/healthz.go

@@ -0,0 +1,12 @@
+package webui
+
+import "net/http"
+
+func handleHealthz() http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Cache-Control", "no-store, no-cache")
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("{}"))
+	})
+}

pkg/webui/routes.go

@@ -0,0 +1,14 @@
+package webui
+
+import (
+	"net/http"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/database"
+)
+
+func addRoutes(
+	mux *http.ServeMux,
+	db *database.DB,
+) {
+	mux.Handle("GET /healthz", handleHealthz())
+}

pkg/webui/run.go

@@ -0,0 +1,45 @@
+package webui
+
+import (
+	"context"
+	"log/slog"
+	"net"
+	"net/http"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/database"
+	"git.adyxax.org/adyxax/tfstated/pkg/logger"
+)
+
+func Run(
+	ctx context.Context,
+	db *database.DB,
+	getenv func(string) string,
+) *http.Server {
+	mux := http.NewServeMux()
+	addRoutes(
+		mux,
+		db,
+	)
+
+	host := getenv("TFSTATED_WEBUI_HOST")
+	if host == "" {
+		host = "127.0.0.1"
+	}
+	port := getenv("TFSTATED_WEBUI_PORT")
+	if port == "" {
+		port = "8081"
+	}
+
+	httpServer := &http.Server{
+		Addr:    net.JoinHostPort(host, port),
+		Handler: logger.Middleware(mux, false),
+	}
+	go func() {
+		slog.Info("webui http server listening", "address", httpServer.Addr)
+		if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			slog.Error("error listening and serving webui http server", "address", httpServer.Addr, "error", err)
+		}
+	}()
+
+	return httpServer
+}