Update flask_app.py

flask_app.py

@@ -36,13 +36,15 @@ from admin_module import admin_manager, admin_required
 if 'app' not in globals():
     app = Flask(__name__)
     
-    # Configuration for sessions
+    # Configuration for sessions - Otimizado para HF Spaces
     app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', 'dev-key-change-in-production-hf-spaces')
     app.config['SESSION_TYPE'] = 'filesystem'
-    app.config['SESSION_PERMANENT'] = False
+    app.config['SESSION_PERMANENT'] = True  # Mudança para True
     app.config['SESSION_USE_SIGNER'] = True
     app.config['SESSION_KEY_PREFIX'] = 'englishhelper:'
     app.config['PERMANENT_SESSION_LIFETIME'] = 86400  # 24 hours
+    app.config['SESSION_FILE_DIR'] = '/tmp/flask-session'  # Diretório específico
+    app.config['SESSION_FILE_THRESHOLD'] = 500  # Max arquivos de sessão
     
     # Configuração para HF Spaces
     app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 0  # Evitar cache de arquivos
@@ -59,10 +61,18 @@ else:
 
 # Ensure flask_session directory exists
 import os
-session_dir = 'flask_session'
+session_dir = '/tmp/flask-session'
 if not os.path.exists(session_dir):
-    os.makedirs(session_dir)
-    print(f"Created session directory: {session_dir}")
+    os.makedirs(session_dir, exist_ok=True)
+    print(f"✅ Created session directory: {session_dir}")
+
+# Adicionar middleware para debug de sessão
+@app.before_request
+def debug_session():
+    if request.endpoint and 'admin' in request.endpoint:
+        print(f"🔍 Session Debug - Endpoint: {request.endpoint}")
+        print(f"🔍 Session Data: {dict(session)}")
+        print(f"🔍 Session ID: {request.cookies.get('session', 'no-session')}")
 
 # Database initialization (handled by app.py)
 def initialize_database():
@@ -148,6 +158,9 @@ def list_models():
 
 # --- ROTAS PRINCIPAIS ---
 
+# Cache de áudio TTS em memória
+tts_cache = {}
+
 @app.route('/tts-proxy', methods=['POST'])
 def tts_proxy():
     data = request.get_json()
@@ -159,18 +172,41 @@ def tts_proxy():
     if len(text) > 10000:
         return jsonify({"error": "Text is too long. Maximum 10,000 characters allowed."}), 400
     
+    # Criar chave de cache baseada no texto e TLD
+    import hashlib
+    cache_key = hashlib.md5(f"{text}_{tld}".encode()).hexdigest()
+    
     try:
-        # Log para debug
-        print(f"TTS request: {len(text)} characters, tld: {tld}")
+        # Verificar se está no cache
+        if cache_key in tts_cache:
+            print(f"🎵 TTS Cache HIT: {len(text)} chars")
+            cached_audio = tts_cache[cache_key]
+            audio_fp = io.BytesIO(cached_audio)
+            return send_file(audio_fp, mimetype='audio/mpeg', as_attachment=False)
+        
+        # Gerar novo áudio
+        print(f"🎵 TTS Cache MISS: Gerando áudio para {len(text)} chars, tld: {tld}")
         
         tts = gTTS(text=text, lang='en', tld=tld)
         mp3_fp = io.BytesIO()
         tts.write_to_fp(mp3_fp)
         mp3_fp.seek(0)
         
-        return send_file(mp3_fp, mimetype='audio/mpeg')
+        # Salvar no cache
+        audio_data = mp3_fp.read()
+        tts_cache[cache_key] = audio_data
+        
+        # Limitar cache a 50 entradas
+        if len(tts_cache) > 50:
+            oldest_key = next(iter(tts_cache))
+            del tts_cache[oldest_key]
+            
+        # Retornar áudio
+        audio_fp = io.BytesIO(audio_data)
+        return send_file(audio_fp, mimetype='audio/mpeg', as_attachment=False)
+        
     except Exception as e:
-        print(f"TTS Error: {e}")
+        print(f"❌ TTS Error: {e}")
         return jsonify({"error": f"Failed to generate audio via gTTS: {e}"}), 500
 
 # Primeira função explain_proxy removida - duplicata