Add feature 829 (#853)

* add user notification

* add user notification

* add UserStatusChangeNotification constant

* add get_subscribe_users_status interface

* update note

* log debug

* log debug

* add SingleChatType

* add SingleChatType and ContentTypeConf

* delete debug

* auto go.work.sum

pkg/rpcclient/notification/user.go

@@ -0,0 +1,103 @@
+// Copyright © 2023 OpenIM. All rights reserved.
+//
+// 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 notification
+
+import (
+	"context"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/db/controller"
+	relationTb "github.com/OpenIMSDK/Open-IM-Server/pkg/common/db/table/relation"
+	"github.com/OpenIMSDK/Open-IM-Server/pkg/rpcclient"
+	"github.com/OpenIMSDK/protocol/constant"
+	"github.com/OpenIMSDK/protocol/sdkws"
+)
+
+type UserNotificationSender struct {
+	*rpcclient.NotificationSender
+	getUsersInfo func(ctx context.Context, userIDs []string) ([]CommonUser, error)
+	// db controller
+	db controller.UserDatabase
+}
+
+type userNotificationSenderOptions func(*UserNotificationSender)
+
+func WithUserDB(db controller.UserDatabase) userNotificationSenderOptions {
+	return func(u *UserNotificationSender) {
+		u.db = db
+	}
+}
+
+func WithUserFunc(
+	fn func(ctx context.Context, userIDs []string) (users []*relationTb.UserModel, err error),
+) userNotificationSenderOptions {
+	return func(u *UserNotificationSender) {
+		f := func(ctx context.Context, userIDs []string) (result []CommonUser, err error) {
+			users, err := fn(ctx, userIDs)
+			if err != nil {
+				return nil, err
+			}
+			for _, user := range users {
+				result = append(result, user)
+			}
+			return result, nil
+		}
+		u.getUsersInfo = f
+	}
+}
+
+func NewUserNotificationSender(
+	msgRpcClient *rpcclient.MessageRpcClient,
+	opts ...userNotificationSenderOptions,
+) *UserNotificationSender {
+	f := &UserNotificationSender{
+		NotificationSender: rpcclient.NewNotificationSender(rpcclient.WithRpcClient(msgRpcClient)),
+	}
+	for _, opt := range opts {
+		opt(f)
+	}
+	return f
+}
+
+func (u *UserNotificationSender) getUsersInfoMap(
+	ctx context.Context,
+	userIDs []string,
+) (map[string]*sdkws.UserInfo, error) {
+	users, err := u.getUsersInfo(ctx, userIDs)
+	if err != nil {
+		return nil, err
+	}
+	result := make(map[string]*sdkws.UserInfo)
+	for _, user := range users {
+		result[user.GetUserID()] = user.(*sdkws.UserInfo)
+	}
+	return result, nil
+}
+
+func (u *UserNotificationSender) getFromToUserNickname(
+	ctx context.Context,
+	fromUserID, toUserID string,
+) (string, string, error) {
+	users, err := u.getUsersInfoMap(ctx, []string{fromUserID, toUserID})
+	if err != nil {
+		return "", "", nil
+	}
+	return users[fromUserID].Nickname, users[toUserID].Nickname, nil
+}
+
+func (u *UserNotificationSender) UserStatusChangeNotification(
+	ctx context.Context,
+	tips *sdkws.UserStatusChangeTips,
+) error {
+	return u.Notification(ctx, tips.FromUserID, tips.ToUserID, constant.UserStatusChangeNotification, tips)
+}