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RecordingController.hpp
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RecordingController.hpp
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#pragma once
#include <boost/asio.hpp>
#include <capnp/serialize.h>
#include <kj/std/iostream.h>
#include <guacamole/timestamp.h>
#include <chrono>
#include <cstdint>
#include <ctime>
#include <fstream>
#include <iostream>
#include <string>
#include <string_view>
#include <unordered_set>
#include "CollabVm.capnp.h"
#include "SocketMessage.hpp"
namespace CollabVm::Server {
template<typename TCallbacks>
struct RecordingController {
template<typename TExecutionContext>
RecordingController(TExecutionContext& context, std::uint32_t vm_id)
: vm_id_(vm_id),
stop_timer_(context),
keyframe_timer_(context) {
}
void SetRecordingSettings(ServerSetting::Recordings::Reader settings) {
const auto keyframe_interval = std::chrono::seconds(settings.getKeyframeInterval());
const auto create_keyframe =
keyframe_interval_ != keyframe_interval
|| settings_.getCaptureDisplay() != settings.getCaptureDisplay()
|| settings_.getCaptureAudio() != settings.getCaptureAudio();
settings_message_builder_.setRoot(settings);
settings_ = settings_message_builder_.getRoot<ServerSetting::Recordings>();
file_duration_ = std::chrono::minutes(settings.getFileDuration());
keyframe_interval_ = keyframe_interval;
if (!IsRecording()) {
return;
}
if (const auto expiration =
stop_timer_.expiry() - std::chrono::steady_clock::now();
expiration < file_duration_) {
Start();
return;
}
if (create_keyframe) {
StartKeyframeTimer();
}
}
void Start() {
if (!file_duration_.count()) {
return;
}
auto start_time = Stop();
if (start_time == std::chrono::time_point<std::chrono::system_clock>::min()) {
start_time = std::chrono::system_clock::now();
}
auto error_code = std::error_code();
std::filesystem::create_directories(recordings_directory, error_code);
if (error_code) {
return;
}
const auto date_time = GetCurrentDateTime();
if (date_time.empty()) {
return;
}
filename_ = std::string(recordings_directory) + "vm"
+ std::to_string(vm_id_) + '_' + date_time + ".bin";
file_stream_.open(filename_, std::fstream::binary | std::fstream::out);
if (!IsRecording()) {
std::cout << "Failed to create recording file \"" << filename_ << '"' << std::endl;
return;
}
auto file_header = file_header_.initRoot<RecordingFileHeader>();
file_header.setVmId(vm_id_);
file_header.setStartTime(
std::chrono::duration_cast<std::chrono::milliseconds>(
start_time.time_since_epoch()).count());
auto keyframe_offsets = file_header.initKeyframes(
keyframe_interval_.count() ? file_duration_ / keyframe_interval_ : 0);
next_keyframe_offset_ = keyframe_offsets.begin();
stop_timer_.expires_after(file_duration_);
stop_timer_.async_wait([this](const auto error_code) {
if (error_code) {
Stop();
} else {
Start();
}
});
WriteFileHeader();
static_cast<TCallbacks&>(*this).OnRecordingStarted(start_time);
StartKeyframeTimer();
}
std::chrono::time_point<std::chrono::system_clock> Stop() {
if (!IsRecording()) {
return std::chrono::time_point<std::chrono::system_clock>::min();
}
keyframe_timer_.cancel();
stop_timer_.cancel();
const auto now = std::chrono::system_clock::now();
auto file_header = file_header_.getRoot<RecordingFileHeader>();
file_header.setStopTime(
std::chrono::duration_cast<std::chrono::milliseconds>(
now.time_since_epoch()).count());
WriteFileHeader();
file_stream_.close();
static_cast<TCallbacks&>(*this).OnRecordingStopped(now);
filename_ = "";
return now;
}
[[nodiscard]]
bool IsRecording() const {
return file_stream_.is_open() && file_stream_.good();
}
[[nodiscard]]
std::string_view GetFilename() const {
return filename_;
}
void WriteMessage(SocketMessage& message) {
auto collab_vm_message = message.GetRoot<CollabVmServerMessage::Message>();
if (!IsRecording()
|| !ShouldRecordMessage(collab_vm_message)) {
return;
}
IncludeTimestamp(collab_vm_message);
message.CreateFrame();
for (auto&& buffer : message.GetBuffers()) {
file_stream_.write(
static_cast<const char*>(buffer.data()), buffer.size());
}
}
void WriteMessage(capnp::MessageBuilder& message_builder) {
auto message = message_builder.getRoot<CollabVmServerMessage::Message>();
if (!IsRecording()
|| !ShouldRecordMessage(message)) {
return;
}
auto output_stream = kj::std::StdOutputStream(file_stream_);
IncludeTimestamp(message);
capnp::writeMessage(output_stream, message_builder);
}
void WriteMessage(
Guacamole::GuacClientInstruction::Reader guacamole_instruction) {
if (!IsRecording() || !settings_.getCaptureInput()) {
return;
}
if (guacamole_instruction.which() == Guacamole::GuacClientInstruction::MOUSE) {
auto message_builder = capnp::MallocMessageBuilder();
auto server_mouse = message_builder
.initRoot<CollabVmServerMessage>()
.initMessage()
.initGuacInstr()
.initMouse();
auto client_mouse = guacamole_instruction.getMouse();
server_mouse.setX(client_mouse.getX());
server_mouse.setY(client_mouse.getY());
server_mouse.setButtonMask(client_mouse.getButtonMask());
server_mouse.setTimestamp(
std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch()).count());
WriteMessage(message_builder);
} else if (guacamole_instruction.which() == Guacamole::GuacClientInstruction::KEY) {
auto message_builder = capnp::MallocMessageBuilder();
auto client_key = guacamole_instruction.getKey();
auto server_key = message_builder
.initRoot<CollabVmServerMessage>()
.initMessage()
.initGuacInstr()
.initKey();
server_key.setKeysym(client_key.getKeysym());
server_key.setPressed(client_key.getPressed());
server_key.setTimestamp(
std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch()).count());
WriteMessage(message_builder);
}
}
private:
[[nodiscard]]
bool ShouldRecordMessage(CollabVmServerMessage::Message::Reader message) {
if (message.which() != CollabVmServerMessage::Message::GUAC_INSTR) {
return true;
}
auto guacamole_instruction = message.getGuacInstr();
switch (guacamole_instruction.which()) {
case Guacamole::GuacServerInstruction::SYNC:
return settings_.getCaptureDisplay()
|| settings_.getCaptureInput()
|| settings_.getCaptureAudio();
case Guacamole::GuacServerInstruction::BLOB:
return !ignored_streams_.count(guacamole_instruction.getBlob().getStream());
case Guacamole::GuacServerInstruction::END:
return !ignored_streams_.erase(guacamole_instruction.getEnd());
case Guacamole::GuacServerInstruction::AUDIO:
if (settings_.getCaptureAudio()) {
return true;
}
ignored_streams_.insert(guacamole_instruction.getAudio().getStream());
return false;
case Guacamole::GuacServerInstruction::MOUSE:
case Guacamole::GuacServerInstruction::KEY:
return settings_.getCaptureInput();
default:
if (!settings_.getCaptureDisplay()) {
// Assume all other instructions are display-related
return false;
}
break;
}
return true;
}
void IncludeTimestamp(CollabVmServerMessage::Message::Reader message) {
switch (message.which()) {
case CollabVmServerMessage::Message::ADMIN_USER_LIST_ADD:
case CollabVmServerMessage::Message::USER_LIST_REMOVE:
case CollabVmServerMessage::Message::CHANGE_USERNAME:
case CollabVmServerMessage::Message::VM_TURN_INFO:
case CollabVmServerMessage::Message::VOTE_RESULT:
{
timestamp_message_builder
.initRoot<CollabVmServerMessage::Message>()
.setRecordingTimestamp(
std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch()).count());
auto output_stream = kj::std::StdOutputStream(file_stream_);
capnp::writeMessage(output_stream, timestamp_message_builder);
}
default:
break;
}
}
void StartKeyframeTimer() {
ignored_streams_.clear();
static_cast<TCallbacks&>(*this).OnKeyframeInRecording();
if (!keyframe_interval_.count()) {
keyframe_timer_.cancel();
return;
}
keyframe_timer_.expires_after(keyframe_interval_);
keyframe_timer_.async_wait([this](const auto error_code) {
if (error_code) {
return;
}
auto file_header = file_header_.getRoot<RecordingFileHeader>();
auto keyframe_offsets = file_header.getKeyframes();
if (next_keyframe_offset_ == keyframe_offsets.end()) {
Start();
return;
}
auto keyframe =
keyframe_offsets[next_keyframe_offset_ - keyframe_offsets.begin()];
keyframe.setFileOffset(file_stream_.tellp());
keyframe.setTimestamp(
std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch()).count());
++next_keyframe_offset_;
file_header.setKeyframesCount(file_header.getKeyframesCount() + 1);
WriteFileHeader();
StartKeyframeTimer();
});
};
void WriteFileHeader() {
const auto original_position = file_stream_.tellp();
file_stream_.seekp(0);
auto output_stream = kj::std::StdOutputStream(file_stream_);
capnp::writeMessage(output_stream, file_header_);
if (original_position) {
file_stream_.seekp(original_position);
}
}
static std::string GetCurrentDateTime() {
const auto now = std::time(nullptr);
char buffer[64];
std::strftime(buffer, sizeof(buffer), "%Y-%m-%d_%I-%M-%S_%p", std::localtime(&now));
return buffer;
}
const std::uint32_t vm_id_;
std::ofstream file_stream_;
capnp::MallocMessageBuilder file_header_;
capnp::List<RecordingFileHeader::Keyframe>::Builder::Iterator next_keyframe_offset_;
boost::asio::steady_timer stop_timer_;
boost::asio::steady_timer keyframe_timer_;
std::chrono::minutes file_duration_ = std::chrono::minutes::zero();
std::chrono::seconds keyframe_interval_ = std::chrono::seconds::zero();
std::string filename_;
capnp::MallocMessageBuilder settings_message_builder_;
ServerSetting::Recordings::Reader settings_ = settings_message_builder_.initRoot<ServerSetting::Recordings>();
capnp::MallocMessageBuilder timestamp_message_builder;
std::unordered_set<std::int32_t> ignored_streams_;
static constexpr std::string_view recordings_directory = "./recordings/";
};
}