Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/cache/keys.go

@@ -0,0 +1,147 @@
+package cache
+
+import (
+	"fmt"
+)
+
+// 缓存键前缀常量
+const (
+	// 帖子相关
+	PrefixPostList = "posts:list"
+	PrefixPost     = "posts:detail"
+
+	// 会话相关
+	PrefixConversationList   = "conversations:list"
+	PrefixConversationDetail = "conversations:detail"
+
+	// 群组相关
+	PrefixGroupMembers = "groups:members"
+	PrefixGroupInfo    = "groups:info"
+
+	// 未读数相关
+	PrefixUnreadSystem       = "unread:system"
+	PrefixUnreadConversation = "unread:conversation"
+	PrefixUnreadDetail       = "unread:detail"
+
+	// 用户相关
+	PrefixUserInfo = "users:info"
+	PrefixUserMe   = "users:me"
+)
+
+// PostListKey 生成帖子列表缓存键
+// postType: 帖子类型 (recommend, hot, follow, latest)
+// page: 页码
+// pageSize: 每页数量
+// userID: 用户维度（仅在个性化列表如 follow 场景使用）
+func PostListKey(postType string, userID string, page, pageSize int) string {
+	if userID == "" {
+		return fmt.Sprintf("%s:%s:%d:%d", PrefixPostList, postType, page, pageSize)
+	}
+	return fmt.Sprintf("%s:%s:%s:%d:%d", PrefixPostList, postType, userID, page, pageSize)
+}
+
+// PostDetailKey 生成帖子详情缓存键
+func PostDetailKey(postID string) string {
+	return fmt.Sprintf("%s:%s", PrefixPost, postID)
+}
+
+// ConversationListKey 生成会话列表缓存键
+func ConversationListKey(userID string, page, pageSize int) string {
+	return fmt.Sprintf("%s:%s:%d:%d", PrefixConversationList, userID, page, pageSize)
+}
+
+// ConversationDetailKey 生成会话详情缓存键
+func ConversationDetailKey(conversationID, userID string) string {
+	return fmt.Sprintf("%s:%s:%s", PrefixConversationDetail, conversationID, userID)
+}
+
+// GroupMembersKey 生成群组成员缓存键
+func GroupMembersKey(groupID string, page, pageSize int) string {
+	return fmt.Sprintf("%s:%s:page:%d:size:%d", PrefixGroupMembers, groupID, page, pageSize)
+}
+
+// GroupMembersAllKey 生成群组全量成员ID列表缓存键
+func GroupMembersAllKey(groupID string) string {
+	return fmt.Sprintf("%s:all:%s", PrefixGroupMembers, groupID)
+}
+
+// GroupInfoKey 生成群组信息缓存键
+func GroupInfoKey(groupID string) string {
+	return fmt.Sprintf("%s:%s", PrefixGroupInfo, groupID)
+}
+
+// UnreadSystemKey 生成系统消息未读数缓存键
+func UnreadSystemKey(userID string) string {
+	return fmt.Sprintf("%s:%s", PrefixUnreadSystem, userID)
+}
+
+// UnreadConversationKey 生成会话未读总数缓存键
+func UnreadConversationKey(userID string) string {
+	return fmt.Sprintf("%s:%s", PrefixUnreadConversation, userID)
+}
+
+// UnreadDetailKey 生成单个会话未读数缓存键
+func UnreadDetailKey(userID, conversationID string) string {
+	return fmt.Sprintf("%s:%s:%s", PrefixUnreadDetail, userID, conversationID)
+}
+
+// UserInfoKey 生成用户信息缓存键
+func UserInfoKey(userID string) string {
+	return fmt.Sprintf("%s:%s", PrefixUserInfo, userID)
+}
+
+// UserMeKey 生成当前用户信息缓存键
+func UserMeKey(userID string) string {
+	return fmt.Sprintf("%s:%s", PrefixUserMe, userID)
+}
+
+// InvalidatePostList 失效帖子列表缓存
+func InvalidatePostList(cache Cache) {
+	cache.DeleteByPrefix(PrefixPostList)
+}
+
+// InvalidatePostDetail 失效帖子详情缓存
+func InvalidatePostDetail(cache Cache, postID string) {
+	cache.Delete(PostDetailKey(postID))
+}
+
+// InvalidateConversationList 失效会话列表缓存
+func InvalidateConversationList(cache Cache, userID string) {
+	cache.DeleteByPrefix(PrefixConversationList + ":" + userID + ":")
+}
+
+// InvalidateConversationDetail 失效会话详情缓存
+func InvalidateConversationDetail(cache Cache, conversationID, userID string) {
+	cache.Delete(ConversationDetailKey(conversationID, userID))
+}
+
+// InvalidateGroupMembers 失效群组成员缓存
+func InvalidateGroupMembers(cache Cache, groupID string) {
+	cache.DeleteByPrefix(PrefixGroupMembers + ":" + groupID)
+}
+
+// InvalidateGroupInfo 失效群组信息缓存
+func InvalidateGroupInfo(cache Cache, groupID string) {
+	cache.Delete(GroupInfoKey(groupID))
+}
+
+// InvalidateUnreadSystem 失效系统消息未读数缓存
+func InvalidateUnreadSystem(cache Cache, userID string) {
+	cache.Delete(UnreadSystemKey(userID))
+}
+
+// InvalidateUnreadConversation 失效会话未读数缓存
+func InvalidateUnreadConversation(cache Cache, userID string) {
+	cache.Delete(UnreadConversationKey(userID))
+}
+
+// InvalidateUnreadDetail 失效单个会话未读数缓存
+func InvalidateUnreadDetail(cache Cache, userID, conversationID string) {
+	cache.Delete(UnreadDetailKey(userID, conversationID))
+}
+
+// InvalidateUserInfo 失效用户信息缓存
+func InvalidateUserInfo(cache Cache, userID string) {
+	cache.Delete(UserInfoKey(userID))
+	cache.Delete(UserMeKey(userID))
+}