public async Task <ReturnData> SendGroupMessage(long groupId, string message)
{
//获得当前登录用户信息
User user = JWTHelper.GetUser(this.Context);
//判断要发送的组是否属于用户所属组
var userGroups = await UserCenterApi.UserGroup.GetGroupsAsync(user.Id);
if (!userGroups.Select(g => g.Id).Contains(groupId))
{
ReturnData returnData = new ReturnData()
{
Status = "error", Msg = "当前用户不属于组" + groupId
};
return(returnData);
}
{
GroupMessage groupMsg = new GroupMessage();
groupMsg.CreateDateTime = DateTime.Now;
groupMsg.FromUserId = user.Id;
groupMsg.FromUserNickName = user.NickName;
groupMsg.Message = message;
groupMsg.TargetGroupId = groupId;
//SignalR通知消息
this.Clients.Group(groupId.ToString()).onMessage(groupMsg);
}
//redis保存聊天记录，方便查看离线消息
using (var redis = RedisHelper.Create())
{
GroupMessage groupMsg = new GroupMessage();
groupMsg.CreateDateTime = DateTime.Now;
groupMsg.FromUserId = user.Id;
groupMsg.FromUserNickName = user.NickName;
groupMsg.Message = message;
groupMsg.TargetGroupId = groupId;
string jsonGroupMsg = JsonConvert.SerializeObject(groupMsg);
var db = redis.GetDatabase();
await db.ListLeftPushAsync(RedisHelper.Prefix_GroupMessages + groupId, jsonGroupMsg);
return(new ReturnData {
Status = "ok", Data = groupMsg
});
}
}
public async override Task OnDisconnected(bool stopCalled)
{
User user = JWTHelper.GetUser(this.Context);
//更新在线状态
using (var redis = RedisHelper.Create())
{
IDatabase db = redis.GetDatabase();
db.StringSet(RedisHelper.Prefix_UserIsOnline + user.Id, false);
}
//把用户从SignalR组移除，提升效率，后续再次打开的时候还会从Redis加载离线消息
//因此不会因为离开组而丢失消息
var groups = await UserCenterApi.UserGroup.GetGroupsAsync(user.Id);
foreach (var group in groups)
{
string groupName = group.Id.ToString();
await Groups.Remove(this.Context.ConnectionId, groupName);
}
await base.OnDisconnected(stopCalled);
}
public async override Task OnConnected()
{
User user = JWTHelper.GetUser(this.Context);
//在redis中记录在线状态，方便后进来的人能获取在线状态/Home/LoadGroupUsers
using (var redis = RedisHelper.Create())
{
IDatabase db = redis.GetDatabase();
db.StringSet(RedisHelper.Prefix_UserIsOnline + user.Id, true);
}
//把用户加入SignalR组，以组的Id为groupName
var groups = await UserCenterApi.UserGroup.GetGroupsAsync(user.Id);
foreach (var group in groups)
{
string groupName = group.Id.ToString();
await Groups.Add(this.Context.ConnectionId, groupName);
}
await base.OnConnected();
}