public async Task Join(string groupId)
{
var existingGroup = chatGroups.FirstOrDefault(x => x.PublicId == groupId);
if (existingGroup == null)
{
await Clients.Caller.SendAsync(receiveMethodName, MessageConstructor.SystemMessage(ErrorMessages.GroupDoesNotExist(groupId)));
return;
}
var groupName = existingGroup.Name;
if (existingGroup.CurrentClientsAmount == existingGroup.MaximumClientsAmount)
{
await Clients.Caller.SendAsync(receiveMethodName, MessageConstructor.SystemMessage(InformationMessages.ClientsInGroupLimitReached(groupName, _appConfig.MaximumGroupSize)));
return;
}
if (existingGroup.ClientsConnected.FirstOrDefault(x => x == Context.ConnectionId) != null)
{
await Clients.Caller.SendAsync(receiveMethodName, MessageConstructor.SystemMessage(ErrorMessages.AlreadyAGroupMember(groupName)));
return;
}
var groupHistoryToClientDto = await _processor.OnGroupJoin(existingGroup.PublicId, Context.ConnectionId);
var groupMessage = new GroupMessage
{
GroupName = groupName,
GroupId = existingGroup.PublicId
};
existingGroup.ClientsConnected.Add(Context.ConnectionId);
var exclutionList = new List <string> {
Context.ConnectionId
};
Task.WaitAll(
Groups.AddToGroupAsync(Context.ConnectionId, groupName),
Clients.Caller.SendAsync(receiveMethodName, MessageConstructor.SystemMessage(InformationMessages.SuccessfullyJoinedGroup(groupName))),
Clients.Caller.SendAsync(GroupMethodNames.OnGroupJoined, groupMessage),
Clients.Caller.SendAsync(GroupMethodNames.ReceiveGroupHistory, MessageConstructor.GroupMessageHistory(groupHistoryToClientDto)),
Clients.GroupExcept(groupName, exclutionList)
.SendAsync(receiveMethodName, MessageConstructor.SystemMessage(InformationMessages.ClientHasJoinedGroup(groupHistoryToClientDto.Client.PublicName))));
}