Halte letzten Player-Status im Backend

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

server/backend/internal/app/app.go

@@ -20,7 +20,7 @@ func New() (*App, error) {
 		Config: cfg,
 		server: &http.Server{
 			Addr:    cfg.HTTPAddress,
-			Handler: httpapi.NewRouter(),
+			Handler: httpapi.NewRouter(httpapi.NewPlayerStatusStore()),
 		},
 	}, nil
 }

server/backend/internal/httpapi/playerstatus.go

@@ -17,7 +17,8 @@ type playerStatusRequest struct {
 	LastHeartbeatAt       string `json:"last_heartbeat_at"`
 }
 
-func handlePlayerStatus(w http.ResponseWriter, r *http.Request) {
+func handlePlayerStatus(store playerStatusStore) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
 		var request playerStatusRequest
 		if err := decodeJSON(r, &request); err != nil {
 			writeError(w, http.StatusBadRequest, "invalid_json", "ungueltiger JSON-Body", nil)
@@ -54,9 +55,39 @@ func handlePlayerStatus(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
+		store.Save(playerStatusRecord{
+			ScreenID:              request.ScreenID,
+			Timestamp:             request.Timestamp,
+			Status:                request.Status,
+			ServerURL:             request.ServerURL,
+			MQTTBroker:            request.MQTTBroker,
+			HeartbeatEverySeconds: request.HeartbeatEverySeconds,
+			StartedAt:             request.StartedAt,
+			LastHeartbeatAt:       request.LastHeartbeatAt,
+		})
+
 		writeJSON(w, http.StatusOK, map[string]string{
 			"status": "accepted",
 		})
+	}
+}
+
+func handleGetLatestPlayerStatus(store playerStatusStore) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		screenID := strings.TrimSpace(r.PathValue("screenId"))
+		if screenID == "" {
+			writeError(w, http.StatusBadRequest, "screen_id_required", "screenId ist erforderlich", nil)
+			return
+		}
+
+		record, ok := store.Get(screenID)
+		if !ok {
+			writeError(w, http.StatusNotFound, "screen_status_not_found", "Fuer diesen Screen liegt noch kein Status vor", nil)
+			return
+		}
+
+		writeJSON(w, http.StatusOK, record)
+	}
 }
 
 func validateOptionalRFC3339(value string) error {

server/backend/internal/httpapi/playerstatus_store.go

@@ -0,0 +1,45 @@
+package httpapi
+
+import "sync"
+
+type playerStatusRecord struct {
+	ScreenID              string `json:"screen_id"`
+	Timestamp             string `json:"ts"`
+	Status                string `json:"status"`
+	ServerURL             string `json:"server_url,omitempty"`
+	MQTTBroker            string `json:"mqtt_broker,omitempty"`
+	HeartbeatEverySeconds int    `json:"heartbeat_every_seconds,omitempty"`
+	StartedAt             string `json:"started_at,omitempty"`
+	LastHeartbeatAt       string `json:"last_heartbeat_at,omitempty"`
+}
+
+type playerStatusStore interface {
+	Save(record playerStatusRecord)
+	Get(screenID string) (playerStatusRecord, bool)
+}
+
+type inMemoryPlayerStatusStore struct {
+	mu      sync.RWMutex
+	records map[string]playerStatusRecord
+}
+
+func newInMemoryPlayerStatusStore() *inMemoryPlayerStatusStore {
+	return &inMemoryPlayerStatusStore{records: make(map[string]playerStatusRecord)}
+}
+
+func NewPlayerStatusStore() playerStatusStore {
+	return newInMemoryPlayerStatusStore()
+}
+
+func (s *inMemoryPlayerStatusStore) Save(record playerStatusRecord) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.records[record.ScreenID] = record
+}
+
+func (s *inMemoryPlayerStatusStore) Get(screenID string) (playerStatusRecord, bool) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	record, ok := s.records[screenID]
+	return record, ok
+}

server/backend/internal/httpapi/playerstatus_test.go

@@ -9,6 +9,7 @@ import (
 )
 
 func TestHandlePlayerStatusAccepted(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
 	body := []byte(`{
 		"screen_id": "info01-dev",
 		"ts": "2026-03-22T16:00:00Z",
@@ -23,7 +24,7 @@ func TestHandlePlayerStatusAccepted(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(store)(w, req)
 
 	if got, want := w.Code, http.StatusOK; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -40,13 +41,22 @@ func TestHandlePlayerStatusAccepted(t *testing.T) {
 	if got, want := response.Status, "accepted"; got != want {
 		t.Fatalf("response status = %q, want %q", got, want)
 	}
+
+	stored, ok := store.Get("info01-dev")
+	if !ok {
+		t.Fatal("store.Get() ok = false, want true")
+	}
+
+	if got, want := stored.ScreenID, "info01-dev"; got != want {
+		t.Fatalf("stored.ScreenID = %q, want %q", got, want)
+	}
 }
 
 func TestHandlePlayerStatusRejectsInvalidJSON(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewBufferString("{"))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -63,7 +73,7 @@ func TestHandlePlayerStatusRejectsMissingScreenID(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -79,7 +89,7 @@ func TestHandlePlayerStatusRejectsMissingTimestamp(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -95,7 +105,7 @@ func TestHandlePlayerStatusRejectsMissingStatus(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -112,7 +122,7 @@ func TestHandlePlayerStatusRejectsMalformedTimestamps(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -130,7 +140,7 @@ func TestHandlePlayerStatusRejectsMalformedStartedAt(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -148,9 +158,54 @@ func TestHandlePlayerStatusRejectsMalformedLastHeartbeatAt(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewReader(body))
 	w := httptest.NewRecorder()
 
-	handlePlayerStatus(w, req)
+	handlePlayerStatus(newInMemoryPlayerStatusStore())(w, req)
 
 	if got, want := w.Code, http.StatusBadRequest; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
 	}
 }
+
+func TestHandleGetLatestPlayerStatus(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
+	store.Save(playerStatusRecord{
+		ScreenID:              "info01-dev",
+		Timestamp:             "2026-03-22T16:00:00Z",
+		Status:                "running",
+		ServerURL:             "http://127.0.0.1:8080",
+		MQTTBroker:            "tcp://127.0.0.1:1883",
+		HeartbeatEverySeconds: 30,
+		StartedAt:             "2026-03-22T15:59:30Z",
+		LastHeartbeatAt:       "2026-03-22T16:00:00Z",
+	})
+
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/info01-dev/status", nil)
+	req.SetPathValue("screenId", "info01-dev")
+	w := httptest.NewRecorder()
+
+	handleGetLatestPlayerStatus(store)(w, req)
+
+	if got, want := w.Code, http.StatusOK; got != want {
+		t.Fatalf("status = %d, want %d", got, want)
+	}
+
+	var response playerStatusRecord
+	if err := json.Unmarshal(w.Body.Bytes(), &response); err != nil {
+		t.Fatalf("Unmarshal() error = %v", err)
+	}
+
+	if got, want := response.ScreenID, "info01-dev"; got != want {
+		t.Fatalf("response.ScreenID = %q, want %q", got, want)
+	}
+}
+
+func TestHandleGetLatestPlayerStatusNotFound(t *testing.T) {
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/missing/status", nil)
+	req.SetPathValue("screenId", "missing")
+	w := httptest.NewRecorder()
+
+	handleGetLatestPlayerStatus(newInMemoryPlayerStatusStore())(w, req)
+
+	if got, want := w.Code, http.StatusNotFound; got != want {
+		t.Fatalf("status = %d, want %d", got, want)
+	}
+}

server/backend/internal/httpapi/router.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 )
 
-func NewRouter() http.Handler {
+func NewRouter(store playerStatusStore) http.Handler {
 	mux := http.NewServeMux()
 
 	mux.HandleFunc("GET /healthz", func(w http.ResponseWriter, _ *http.Request) {
@@ -26,7 +26,8 @@ func NewRouter() http.Handler {
 
 	mux.HandleFunc("GET /api/v1/meta", handleMeta)
 
-	mux.HandleFunc("POST /api/v1/player/status", handlePlayerStatus)
+	mux.HandleFunc("POST /api/v1/player/status", handlePlayerStatus(store))
+	mux.HandleFunc("GET /api/v1/screens/{screenId}/status", handleGetLatestPlayerStatus(store))
 
 	mux.HandleFunc("POST /api/v1/tools/message-wall/resolve", handleResolveMessageWall)
 

server/backend/internal/httpapi/router_test.go

@@ -12,7 +12,7 @@ func TestRouterHealthz(t *testing.T) {
 	req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
 	w := httptest.NewRecorder()
 
-	NewRouter().ServeHTTP(w, req)
+	NewRouter(newInMemoryPlayerStatusStore()).ServeHTTP(w, req)
 
 	if got, want := w.Code, http.StatusOK; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -40,7 +40,7 @@ func TestRouterBaseAPI(t *testing.T) {
 	req := httptest.NewRequest(http.MethodGet, "/api/v1", nil)
 	w := httptest.NewRecorder()
 
-	NewRouter().ServeHTTP(w, req)
+	NewRouter(newInMemoryPlayerStatusStore()).ServeHTTP(w, req)
 
 	if got, want := w.Code, http.StatusOK; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -77,7 +77,7 @@ func TestRouterMeta(t *testing.T) {
 	req := httptest.NewRequest(http.MethodGet, "/api/v1/meta", nil)
 	w := httptest.NewRecorder()
 
-	NewRouter().ServeHTTP(w, req)
+	NewRouter(newInMemoryPlayerStatusStore()).ServeHTTP(w, req)
 
 	if got, want := w.Code, http.StatusOK; got != want {
 		t.Fatalf("status = %d, want %d", got, want)
@@ -122,7 +122,20 @@ func TestRouterPlayerStatusRoute(t *testing.T) {
 	req := httptest.NewRequest(http.MethodPost, "/api/v1/player/status", bytes.NewBufferString(`{"screen_id":"demo","ts":"2026-03-22T16:00:00Z","status":"running"}`))
 	w := httptest.NewRecorder()
 
-	NewRouter().ServeHTTP(w, req)
+	NewRouter(newInMemoryPlayerStatusStore()).ServeHTTP(w, req)
+
+	if got, want := w.Code, http.StatusOK; got != want {
+		t.Fatalf("status = %d, want %d", got, want)
+	}
+}
+
+func TestRouterScreenStatusRoute(t *testing.T) {
+	store := newInMemoryPlayerStatusStore()
+	store.Save(playerStatusRecord{ScreenID: "demo", Timestamp: "2026-03-22T16:00:00Z", Status: "running"})
+	req := httptest.NewRequest(http.MethodGet, "/api/v1/screens/demo/status", nil)
+	w := httptest.NewRecorder()
+
+	NewRouter(store).ServeHTTP(w, req)
 
 	if got, want := w.Code, http.StatusOK; got != want {
 		t.Fatalf("status = %d, want %d", got, want)