压缩历史至 95081aff

internal/apps/leaderboard/logic.go

@@ -0,0 +1,98 @@
+/*
+Copyright 2025 linux.do
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package leaderboard
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/linux-do/credit/internal/db"
+	"github.com/linux-do/credit/internal/model"
+)
+
+func getList(ctx context.Context, req *ListRequest) (*ListResponse, error) {
+	// 检查 Redis 缓存
+	cacheKey := fmt.Sprintf("%slist:p:%d:s:%d", cacheKeyPrefix, req.Page, req.PageSize)
+	if data, err := db.Redis.Get(ctx, db.PrefixedKey(cacheKey)).Bytes(); err == nil {
+		var cached ListResponse
+		if err := json.Unmarshal(data, &cached); err == nil {
+			return &cached, nil
+		}
+	}
+
+	// 2. 查询数据库
+	items, total, err := queryLeaderboard(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &ListResponse{
+		SortBy:   "available_balance",
+		Order:    "desc",
+		Page:     req.Page,
+		PageSize: req.PageSize,
+		Total:    total,
+		Items:    items,
+	}
+
+	if data, err := json.Marshal(response); err == nil {
+		_ = db.Redis.Set(ctx, db.PrefixedKey(cacheKey), data, getCacheTTL(ctx)).Err()
+	}
+	return response, nil
+}
+
+func getUserRank(ctx context.Context, userID uint64) (*UserRankResponse, error) {
+	// 检查缓存
+	cacheKey := fmt.Sprintf("%suser:%d", cacheKeyPrefix, userID)
+	if data, err := db.Redis.Get(ctx, db.PrefixedKey(cacheKey)).Bytes(); err == nil {
+		var cached UserRankResponse
+		if err := json.Unmarshal(data, &cached); err == nil {
+			return &cached, nil
+		}
+	}
+
+	// 查询用户余额
+	var user model.User
+	if err := db.DB(ctx).Select("id, available_balance").Where("id = ? AND is_active = ?", userID, true).First(&user).Error; err != nil {
+		return nil, err
+	}
+
+	// 计算排名：统计比当前用户排位更高的人数
+	// 排序规则：available_balance DESC, id ASC
+	// 即：余额更高，或余额相同但 id 更小
+	var rank int64
+	if err := db.DB(ctx).Model(&model.User{}).
+		Where("is_active = ? AND ((available_balance > ?) OR (available_balance = ? AND id < ?))",
+			true, user.AvailableBalance, user.AvailableBalance, userID).
+		Count(&rank).Error; err != nil {
+		return nil, err
+	}
+
+	response := &UserRankResponse{
+		User: UserRankInfo{
+			UserID:           userID,
+			Rank:             int(rank + 1),
+			AvailableBalance: user.AvailableBalance,
+		},
+	}
+
+	if data, err := json.Marshal(response); err == nil {
+		_ = db.Redis.Set(ctx, db.PrefixedKey(cacheKey), data, getCacheTTL(ctx)).Err()
+	}
+	return response, nil
+}