rust-course/server/internal/cache/cache.go

package cache

import (
	"database/sql"
	"time"

	"github.com/imdotdev/im.dev/server/internal/interaction"
	"github.com/imdotdev/im.dev/server/pkg/db"
	"github.com/imdotdev/im.dev/server/pkg/log"
	"github.com/imdotdev/im.dev/server/pkg/models"
)

var logger = log.RootLogger.New("logger", "cache")

func Init() {
	time.Sleep(2 * time.Second)
	for {
		// load users
		rows, err := db.Conn.Query(`SELECT id,username,role,nickname,avatar,last_seen_at,created FROM user`)
		if err != nil {
			logger.Error("load users error", "error", err)
			time.Sleep(60 * time.Second)
			continue
		}

		var users []*models.User
		usersMap := make(map[string]*models.User)
		for rows.Next() {
			user := &models.User{}
			err := rows.Scan(&user.ID, &user.Username, &user.Role, &user.Nickname, &user.Avatar, &user.LastSeenAt, &user.Created)
			if err != nil {
				logger.Warn("scan user error", "error", err)
				continue
			}

			err = db.Conn.QueryRow("SELECT tagline from user_profile WHERE id=?", user.ID).Scan(&user.Tagline)
			if err != nil && err != sql.ErrNoRows {
				logger.Warn("query user profile error", "error", err)
			}

			if user.Cover == "" {
				user.Cover = models.DefaultCover
			}

			user.Follows = interaction.GetFollows(user.ID)
			users = append(users, user)
			usersMap[user.ID] = user
		}

		models.UsersCache = users
		models.UsersMapCache = usersMap

		time.Sleep(60 * time.Second)
	}
}