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UserChannel.hpp
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UserChannel.hpp
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#pragma once
#include <boost/functional/hash.hpp>
#include <cstdint>
#include <unordered_map>
#include "IPData.hpp"
namespace CollabVm::Server
{
template<typename TClient,
typename TUserData,
typename TBase = std::nullptr_t>
struct UserChannel
{
explicit UserChannel(const std::uint32_t id) :
chat_room_(id)
{
}
void Clear()
{
users_.clear();
}
const auto& GetChatRoom() const
{
return chat_room_;
}
auto& GetChatRoom()
{
return chat_room_;
}
const auto& GetUsers() const
{
return users_;
}
template<typename TCallback>
void ForEachUser(TCallback&& callback) {
OnForEachUsers(callback);
std::for_each(
users_.begin(),
users_.end(),
[callback=std::forward<TCallback>(callback)]
(auto& user) mutable {
callback(user.second, *user.first);
});
}
template<typename TCallback>
void OnForEachUsers(TCallback& callback) {
if constexpr (!std::is_null_pointer_v<TBase>) {
if constexpr (!std::is_same_v<
decltype(&UserChannel::OnForEachUsers<TCallback>),
decltype(&TBase::template OnForEachUsers<TCallback>)>) {
static_cast<TBase&>(*this).OnForEachUsers(callback);
}
}
}
void AddUser(TUserData&& initial_user_data, std::shared_ptr<TClient> user)
{
OnAddUser(user);
auto& ip_data = ip_data_[initial_user_data.ip_address];
ip_data.reference_count_++;
auto& user_data = users_.emplace(user, UserData(std::move(initial_user_data), ip_data)).first->second;
admins_count_ += !!(user_data.user_type == CollabVmServerMessage::UserType::ADMIN);
user->QueueMessage(
user_data.IsAdmin()
? CreateAdminUserListMessage()
: CreateUserListMessage());
if (users_.size() <= 1) {
return;
}
auto user_message = SocketMessage::CreateShared();
auto add_user = user_message->GetMessageBuilder()
.initRoot<CollabVmServerMessage>()
.initMessage()
.initUserListAdd();
add_user.setChannel(GetId());
AddUserToList(user_data, add_user);
auto admin_user_message = SocketMessage::CreateShared();
auto add_admin_user = admin_user_message->GetMessageBuilder()
.initRoot<CollabVmServerMessage>()
.initMessage()
.initAdminUserListAdd();
add_admin_user.setChannel(GetId());
AddUserToList(user_data, add_admin_user.initUser());
ForEachUser([excluded_user = user.get(), user_message=std::move(user_message),
admin_user_message=std::move(admin_user_message)]
(const auto& user_data, TClient& user)
{
if (&user == excluded_user) {
return;
}
user.QueueMessage(
user_data.IsAdmin() ? admin_user_message : user_message);
});
}
void OnAddUser(std::shared_ptr<TClient> user) {
if constexpr (!std::is_same_v<TBase, std::nullptr_t>) {
if constexpr (!std::is_same_v<
decltype(&UserChannel::OnAddUser),
decltype(&TBase::OnAddUser)>) {
static_cast<TBase&>(*this).OnAddUser(user);
}
}
}
auto GetUserData(std::shared_ptr<TClient> user_ptr)
{
return GetUserData(*this, user_ptr);
}
auto GetUserData(std::shared_ptr<TClient> user_ptr) const
{
return GetUserData(*this, user_ptr);
}
void BroadcastMessage(std::shared_ptr<SocketMessage>&& message) {
ForEachUser(
[message =
std::forward<std::shared_ptr<SocketMessage>>(message)]
(const auto&, auto& user)
{
user.QueueMessage(message);
});
}
auto CreateUserListMessage() {
return CreateUserListMessages(
&CollabVmServerMessage::Message::Builder::initUserList);
}
auto CreateAdminUserListMessage() {
return CreateUserListMessages(
&CollabVmServerMessage::Message::Builder::initAdminUserList);
}
void RemoveUser(std::shared_ptr<TClient> user)
{
auto user_it = users_.find(user);
if (user_it == users_.end()) {
return;
}
auto& user_data = user_it->second;
if (!--user_data.ip_data.reference_count_) {
ip_data_.erase(user_data.ip_address);
}
admins_count_ -= !!(user_data.user_type == CollabVmServerMessage::UserType::ADMIN);
auto message = SocketMessage::CreateShared();
auto user_list_remove = message->GetMessageBuilder()
.initRoot<CollabVmServerMessage>()
.initMessage()
.initUserListRemove();
user_list_remove.setChannel(GetId());
user_list_remove.setUsername(user_data.username);
OnRemoveUser(user);
users_.erase(user_it);
BroadcastMessage(std::move(message));
}
void OnRemoveUser(std::shared_ptr<TClient> user) {
if constexpr (!std::is_same_v<TBase, std::nullptr_t>) {
static_cast<TBase&>(*this).OnRemoveUser(user);
}
}
std::uint32_t GetId() const
{
return chat_room_.GetId();
}
private:
template<typename TUserChannel>
static auto GetUserData(TUserChannel& user_channel, std::shared_ptr<TClient> user_ptr)
{
static_assert(std::is_same_v<
std::remove_const_t<TUserChannel>, UserChannel>);
using UserData = std::conditional_t<
std::is_const_v<TUserChannel>, const UserData, UserData>;
auto& users_ = user_channel.users_;
auto user = users_.find(user_ptr);
return user == users_.end()
? std::optional<std::reference_wrapper<UserData>>()
: std::optional<std::reference_wrapper<UserData>>(user->second);
}
template<typename TInitFunction>
auto CreateUserListMessages(TInitFunction init)
{
auto message = SocketMessage::CreateShared();
auto user_list = (message->GetMessageBuilder()
.initRoot<CollabVmServerMessage>()
.initMessage()
.*init)();
user_list.setChannel(GetId());
auto users = user_list.initUsers(users_.size());
ForEachUser(
[this, users_it = users.begin()](auto& user_data, TClient&) mutable
{
AddUserToList(user_data, *users_it++);
});
return message;
}
template<typename TListElement>
void AddUserToList(const TUserData& user, TListElement list_info)
{
auto& username = user.username;
list_info.setUsername(
kj::StringPtr(username.data(), username.length()));
list_info.setUserType(user.user_type);
if constexpr (
std::is_same_v<TListElement, CollabVmServerMessage::UserAdmin::Builder>)
{
auto ip_address = list_info.initIpAddress();
const auto& ip_address_bytes = user.ip_address;
ip_address.setFirst(
boost::endian::native_to_big(
*reinterpret_cast<const std::uint64_t*>(&ip_address_bytes[0])));
ip_address.setSecond(
boost::endian::native_to_big(
*reinterpret_cast<const std::uint64_t*>(&ip_address_bytes[8])));
}
}
struct ChannelIPData : IPData::ChannelData
{
std::size_t reference_count_ = 0;
};
struct UserData : TUserData
{
UserData(TUserData&& user_data, ChannelIPData& ip_data)
: TUserData(std::move(user_data)),
ip_data(ip_data)
{
}
ChannelIPData& ip_data;
};
std::unordered_map<std::shared_ptr<TClient>, UserData> users_;
std::unordered_map<
typename TClient::IpAddress::IpBytes,
ChannelIPData,
boost::hash<typename TClient::IpAddress::IpBytes>
> ip_data_;
std::uint32_t admins_count_ = 0;
CollabVmChatRoom<TClient,
CollabVm::Common::max_username_len,
CollabVm::Common::max_chat_message_len> chat_room_;
capnp::MallocMessageBuilder message_builder_;
};
}