[Enhance] API & LinkPlay & something else

- Add song names for getting the score list (For API)
- Try to ensure thread safety in Link Play (twice again)
- Small change about database timeout
- Have a try to use `nginx` and `gevent` (Yes. I ensure it works well. This will not be viewed as a formal and necessary update.)

latest version/main.py

@@ -6,7 +6,7 @@ from logging.config import dictConfig
 from multiprocessing import Process, set_start_method
 from traceback import format_exc
 
-from flask import Flask, request, send_from_directory
+from flask import Flask, make_response, request, send_from_directory
 
 import api
 import server
@@ -14,14 +14,20 @@ import server.init
 import web.index
 import web.login
 from core.constant import Constant
-from core.download import UserDownload, initialize_songfile, get_only_3_song_ids
+from core.download import (UserDownload, get_only_3_song_ids,
+                           initialize_songfile)
 from core.error import ArcError
 from core.sql import Connect
 from server.func import error_return
 from setting import Config
 
 app = Flask(__name__)
-wsgi_app = app.wsgi_app
+
+# from werkzeug.middleware.proxy_fix import ProxyFix
+# app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1, x_host=1)
+# from flask_cors import CORS
+# CORS(app, supports_credentials=True)
+
 
 os.chdir(sys.path[0])  # 更改工作路径，以便于愉快使用相对路径
 
@@ -59,6 +65,10 @@ def download(file_path):
                 raise ArcError('You have reached the download limit.', 903)
             if x.is_valid:
                 x.insert_user_download()
+                # response = make_response()
+                # response.headers['Content-Type'] = 'application/octet-stream'
+                # response.headers['X-Accel-Redirect'] = '/nginx_download/' + file_path
+                # return response
                 return send_from_directory(Constant.SONG_FILE_FOLDER_PATH, file_path, as_attachment=True, conditional=True)
         except ArcError as e:
             if Config.ALLOW_WARNING_LOG:
@@ -68,11 +78,15 @@ def download(file_path):
 
 
 def tcp_server_run():
-    if Config.SSL_CERT and Config.SSL_KEY:
-        app.run(Config.HOST, Config.PORT, ssl_context=(
-            Config.SSL_CERT, Config.SSL_KEY))
+    if False:
+        from gevent.pywsgi import WSGIServer
+        WSGIServer(("127.0.0.1", 5000), app).serve_forever()
     else:
-        app.run(Config.HOST, Config.PORT)
+        if Config.SSL_CERT and Config.SSL_KEY:
+            app.run(Config.HOST, Config.PORT, ssl_context=(
+                Config.SSL_CERT, Config.SSL_KEY))
+        else:
+            app.run(Config.HOST, Config.PORT)
 
 
 def main():