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#pragma once
#include <crow/app.h>
#include <crow/websocket.h>
#include <sys/socket.h>
#include <boost/container/flat_map.hpp>
#include <webserver_common.hpp>
namespace crow
{
namespace obmc_kvm
{
static constexpr const uint maxSessions = 4;
class KvmSession
{
public:
explicit KvmSession(crow::websocket::Connection& conn) :
conn(conn), doingWrite(false), hostSocket(conn.get_io_context())
{
boost::asio::ip::tcp::endpoint endpoint(
boost::asio::ip::make_address("::1"), 5900);
hostSocket.async_connect(
endpoint, [this, &conn](const boost::system::error_code& ec) {
if (ec)
{
BMCWEB_LOG_ERROR
<< "conn:" << &conn
<< ", Couldn't connect to KVM socket port: " << ec;
if (ec != boost::asio::error::operation_aborted)
{
conn.close("Error in connecting to KVM port");
}
return;
}
doRead();
});
}
void onMessage(const std::string& data)
{
if (data.length() > inputBuffer.capacity())
{
BMCWEB_LOG_ERROR << "conn:" << &conn
<< ", Buffer overrun when writing "
<< data.length() << " bytes";
conn.close("Buffer overrun");
return;
}
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", Read " << data.size()
<< " bytes from websocket";
boost::asio::buffer_copy(inputBuffer.prepare(data.size()),
boost::asio::buffer(data));
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", Commiting " << data.size()
<< " bytes from websocket";
inputBuffer.commit(data.size());
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", inputbuffer size "
<< inputBuffer.size();
doWrite();
}
protected:
void doRead()
{
std::size_t bytes = outputBuffer.capacity() - outputBuffer.size();
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", Reading " << bytes
<< " from kvm socket";
hostSocket.async_read_some(
outputBuffer.prepare(outputBuffer.capacity() - outputBuffer.size()),
[this](const boost::system::error_code& ec, std::size_t bytesRead) {
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", read done. Read "
<< bytesRead << " bytes";
if (ec)
{
BMCWEB_LOG_ERROR
<< "conn:" << &conn
<< ", Couldn't read from KVM socket port: " << ec;
if (ec != boost::asio::error::operation_aborted)
{
conn.close("Error in connecting to KVM port");
}
return;
}
outputBuffer.commit(bytesRead);
std::string_view payload(
static_cast<const char*>(outputBuffer.data().data()),
bytesRead);
BMCWEB_LOG_DEBUG << "conn:" << &conn
<< ", Sending payload size " << payload.size();
conn.sendBinary(payload);
outputBuffer.consume(bytesRead);
doRead();
});
}
void doWrite()
{
if (doingWrite)
{
BMCWEB_LOG_DEBUG << "conn:" << &conn
<< ", Already writing. Bailing out";
return;
}
if (inputBuffer.size() == 0)
{
BMCWEB_LOG_DEBUG << "conn:" << &conn
<< ", inputBuffer empty. Bailing out";
return;
}
doingWrite = true;
hostSocket.async_write_some(
inputBuffer.data(), [this](const boost::system::error_code& ec,
std::size_t bytesWritten) {
BMCWEB_LOG_DEBUG << "conn:" << &conn << ", Wrote "
<< bytesWritten << "bytes";
doingWrite = false;
inputBuffer.consume(bytesWritten);
if (ec == boost::asio::error::eof)
{
conn.close("KVM socket port closed");
return;
}
if (ec)
{
BMCWEB_LOG_ERROR << "conn:" << &conn
<< ", Error in KVM socket write " << ec;
if (ec != boost::asio::error::operation_aborted)
{
conn.close("Error in reading to host port");
}
return;
}
doWrite();
});
}
crow::websocket::Connection& conn;
boost::asio::ip::tcp::socket hostSocket;
boost::beast::flat_static_buffer<1024U * 50U> outputBuffer;
boost::beast::flat_static_buffer<1024U> inputBuffer;
bool doingWrite;
};
static boost::container::flat_map<crow::websocket::Connection*,
std::unique_ptr<KvmSession>>
sessions;
inline void requestRoutes(CrowApp& app)
{
sessions.reserve(maxSessions);
BMCWEB_ROUTE(app, "/kvm/0")
.websocket()
.onopen([](crow::websocket::Connection& conn) {
BMCWEB_LOG_DEBUG << "Connection " << &conn << " opened";
if (sessions.size() == maxSessions)
{
conn.close("Max sessions are already connected");
return;
}
sessions[&conn] = std::make_unique<KvmSession>(conn);
})
.onclose([](crow::websocket::Connection& conn,
const std::string& reason) { sessions.erase(&conn); })
.onmessage([](crow::websocket::Connection& conn,
const std::string& data, bool is_binary) {
if (sessions[&conn])
{
sessions[&conn]->onMessage(data);
}
});
}
} // namespace obmc_kvm
} // namespace crow
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