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UI_API_CONFIG.md
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197
UI_API_CONFIG.md
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# UI API Configuration
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## Übersicht
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Die UI-Anwendung verwendet keine hart codierten API-URLs mehr. Stattdessen wird die API-Basis-URL über die Umgebungsvariable `API_BASE` konfiguriert.
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## Konfiguration
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### Umgebungsvariable
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- **Name**: `API_BASE`
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- **Standard**: `http://localhost:8001`
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- **Beispiele**:
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- Lokal: `http://localhost:8001`
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- Docker: `http://api:8001`
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- Kubernetes: `http://api-service:8001`
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- **Name**: `BASE_PATH`
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- **Standard**: `""` (leer)
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- **Beschreibung**: Pfad-Präfix für Reverse Proxy (z.B. `/ui`)
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- **Beispiele**:
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- Ohne Proxy: `""` (leer)
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- Hinter Proxy: `/ui`
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- Traefik/nginx: `/home-automation`
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### Startup-Ausgabe
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Beim Start zeigt die UI die verwendete API-URL an:
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```
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UI using API_BASE: http://localhost:8001
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```
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## API-Funktionen
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### `api_url(path: str) -> str`
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Hilfsfunktion zum Erstellen vollständiger API-URLs:
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```python
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from apps.ui.main import api_url
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# Beispiel
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url = api_url("/devices") # → "http://localhost:8001/devices"
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```
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### Health Endpoint
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Für Kubernetes Liveness/Readiness Probes:
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```bash
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GET /health
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```
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Antwort:
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```json
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{
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"status": "ok",
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"service": "ui",
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"api_base": "http://localhost:8001"
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}
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```
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## Verwendung
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### Lokal (Entwicklung)
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```bash
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# Standard (verwendet http://localhost:8001)
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poetry run uvicorn apps.ui.main:app --host 0.0.0.0 --port 8002
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# Mit anderer API
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API_BASE=http://192.168.1.100:8001 poetry run uvicorn apps.ui.main:app --port 8002
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# Mit BASE_PATH (Reverse Proxy)
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BASE_PATH=/ui poetry run uvicorn apps.ui.main:app --port 8002
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# Zugriff: http://localhost:8002/ui/
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```
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### Docker Compose
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```yaml
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services:
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ui:
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build: .
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ports:
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- "8002:8002"
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environment:
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- API_BASE=http://api:8001
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- BASE_PATH="" # Leer für direkten Zugriff
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depends_on:
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- api
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```
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### Docker Compose mit Reverse Proxy
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```yaml
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services:
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nginx:
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image: nginx:alpine
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ports:
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- "80:80"
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volumes:
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- ./nginx.conf:/etc/nginx/nginx.conf
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ui:
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build: .
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environment:
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- API_BASE=http://api:8001
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- BASE_PATH=/ui # Pfad-Präfix für nginx
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expose:
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- "8002"
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```
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### Kubernetes
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```yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: ui
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: ui
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template:
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metadata:
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labels:
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app: ui
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spec:
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containers:
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- name: ui
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image: home-automation-ui:latest
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env:
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- name: API_BASE
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value: "http://api-service:8001"
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- name: BASE_PATH
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value: "/ui" # Für Ingress
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ports:
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- containerPort: 8002
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livenessProbe:
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httpGet:
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path: /ui/health # Mit BASE_PATH!
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port: 8002
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initialDelaySeconds: 5
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periodSeconds: 10
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readinessProbe:
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httpGet:
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path: /ui/health # Mit BASE_PATH!
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port: 8002
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initialDelaySeconds: 5
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periodSeconds: 5
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resources:
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requests:
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memory: "128Mi"
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cpu: "100m"
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limits:
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memory: "256Mi"
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cpu: "500m"
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---
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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name: ui-ingress
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spec:
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rules:
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- host: home.example.com
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http:
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paths:
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- path: /ui
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pathType: Prefix
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backend:
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service:
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name: ui-service
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port:
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number: 8002
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```
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## Geänderte Dateien
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1. **apps/ui/main.py**
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- `API_BASE` aus Umgebung lesen
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- `api_url()` Hilfsfunktion
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- `/health` Endpoint
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- `API_BASE` an Template übergeben
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2. **apps/ui/api_client.py**
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- `fetch_devices(api_base)` benötigt Parameter
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- `fetch_layout(api_base)` benötigt Parameter
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3. **apps/ui/templates/dashboard.html**
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- JavaScript verwendet `{{ api_base }}` aus Backend
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## Akzeptanz-Kriterien ✓
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- ✅ `print(API_BASE)` zeigt korrekten Wert beim Start
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- ✅ UI funktioniert lokal ohne Codeänderung
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- ✅ Mit `API_BASE=http://api:8001` ruft UI korrekt den API-Service an
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- ✅ Health-Endpoint für Kubernetes verfügbar
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- ✅ Keine hart codierten URLs mehr
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## Vorteile
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1. **Flexibilität**: API-URL per ENV konfigurierbar
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2. **Docker/K8s Ready**: Service Discovery unterstützt
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3. **Health Checks**: Monitoring-Integration möglich
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4. **Abwärtskompatibel**: Bestehende Deployments funktionieren weiter
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5. **Clean Code**: Zentrale Konfiguration statt verteilte Hardcodes
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