Code refactoring

- Code refactoring
- Fix a bug that the other player will not become the host of the room at once, when the player disconnect in link play.

> Maybe add many unknown bugs. XD
> The song database `arcsong.db` will not used in the future. You can use a tool in `tool` folder to import old data.

latest version/server/purchase.py

@@ -0,0 +1,140 @@
+from time import time
+
+from core.error import ArcError, ItemUnavailable
+from core.item import ItemFactory
+from core.purchase import Purchase, PurchaseList
+from core.redeem import UserRedeem
+from core.sql import Connect
+from core.user import UserOnline
+from flask import Blueprint, request
+
+from .auth import auth_required
+from .func import error_return, success_return
+
+bp = Blueprint('purchase', __name__, url_prefix='/purchase')
+
+
+@bp.route('/bundle/pack', methods=['GET'])  # 曲包信息
+@auth_required(request)
+def bundle_pack(user_id):
+    with Connect() as c:
+        try:
+            x = PurchaseList(c, UserOnline(c, user_id)
+                             ).select_from_type('pack')
+            return success_return(x.to_dict)
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/bundle/single', methods=['GET'])  # 单曲购买信息获取
+@auth_required(request)
+def get_single(user_id):
+    with Connect() as c:
+        try:
+            x = PurchaseList(c, UserOnline(c, user_id)
+                             ).select_from_type('single')
+            return success_return(x.to_dict)
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/pack', methods=['POST'])  # 曲包和单曲购买
+@auth_required(request)
+def buy_pack_or_single(user_id):
+    with Connect() as c:
+        try:
+            if 'pack_id' in request.form:
+                purchase_name = request.form['pack_id']
+            elif 'single_id' in request.form:
+                purchase_name = request.form['single_id']
+            else:
+                return success_return()
+
+            x = Purchase(c, UserOnline(c, user_id)).select(purchase_name)
+            x.buy()
+
+            return success_return({
+                'user_id': x.user.user_id,
+                'ticket': x.user.ticket,
+                'packs': x.user.packs,
+                'singles': x.user.singles,
+                'characters': x.user.characters_list
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/item', methods=['POST'])  # 特殊购买，world模式boost和stamina
+@auth_required(request)
+def buy_special(user_id):
+    with Connect() as c:
+        try:
+            if 'item_id' not in request.form:
+                return error_return()
+            item_id = request.form['item_id']
+
+            x = Purchase(c, UserOnline(c, user_id))
+            x.purchase_name = item_id
+            x.price = 50
+            x.orig_price = 50
+            x.discount_from = -1
+            x.discount_to = -1
+            x.items = [ItemFactory(c).get_item(item_id)]
+            x.buy()
+
+            r = {'user_id': x.user.user_id, 'ticket': x.user.ticket}
+            if item_id == 'stamina6':
+                r['stamina'] = x.user.stamina.stamina
+                r['max_stamina_ts'] = x.user.stamina.max_stamina_ts
+
+            return success_return(r)
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/stamina/<buy_stamina_type>', methods=['POST'])  # 购买体力
+@auth_required(request)
+def purchase_stamina(user_id, buy_stamina_type):
+    with Connect() as c:
+        try:
+            if buy_stamina_type != 'fragment':
+                return error_return()
+
+            user = UserOnline(c, user_id)
+            user.select_user_about_fragstam()
+            now = int(time()*1000)
+            if user.next_fragstam_ts > now:
+                return ItemUnavailable('Buying stamina by fragment is not available yet.', 905)
+
+            user.update_user_about_fragstam(now + 24 * 3600 * 1000)
+            user.select_user_about_stamina()
+            user.stamina.stamina += 6
+            user.stamina.update()
+
+            return success_return({
+                "user_id": user.user_id,
+                "stamina": user.stamina.stamina,
+                "max_stamina_ts": user.stamina.max_stamina_ts,
+                "next_fragstam_ts": user.next_fragstam_ts
+            })
+        except ArcError as e:
+            return error_return(e)
+    return error_return()
+
+
+@bp.route('/me/redeem', methods=['POST'])  # 兑换码
+@auth_required(request)
+def redeem(user_id):
+    with Connect() as c:
+        try:
+            x = UserRedeem(c, UserOnline(c, user_id))
+            x.claim_user_redeem(request.form['code'])
+
+            return success_return({"coupon": "fragment" + str(x.fragment) if x.fragment > 0 else ""})
+        except ArcError as e:
+            return error_return(e)
+    return error_return()