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#pragma once
#include <array>
#include <async_resp.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/beast/websocket.hpp>
#include <functional>
#include "http_request.h"
#ifdef BMCWEB_ENABLE_SSL
#include <boost/beast/websocket/ssl.hpp>
#endif
namespace crow
{
namespace websocket
{
struct Connection : std::enable_shared_from_this<Connection>
{
public:
explicit Connection(const crow::Request& reqIn) :
req(reqIn.req), userdataPtr(nullptr){};
virtual void sendBinary(const std::string_view msg) = 0;
virtual void sendBinary(std::string&& msg) = 0;
virtual void sendText(const std::string_view msg) = 0;
virtual void sendText(std::string&& msg) = 0;
virtual void close(const std::string_view msg = "quit") = 0;
virtual boost::asio::io_context& get_io_context() = 0;
virtual ~Connection() = default;
void userdata(void* u)
{
userdataPtr = u;
}
void* userdata()
{
return userdataPtr;
}
boost::beast::http::request<boost::beast::http::string_body> req;
crow::Response res;
private:
void* userdataPtr;
};
template <typename Adaptor> class ConnectionImpl : public Connection
{
public:
ConnectionImpl(
const crow::Request& reqIn, Adaptor adaptorIn,
std::function<void(Connection&, std::shared_ptr<bmcweb::AsyncResp>)>
open_handler,
std::function<void(Connection&, const std::string&, bool)>
message_handler,
std::function<void(Connection&, const std::string&)> close_handler,
std::function<void(Connection&)> error_handler) :
Connection(reqIn),
ws(std::move(adaptorIn)), inString(), inBuffer(inString, 131088),
openHandler(std::move(open_handler)),
messageHandler(std::move(message_handler)),
closeHandler(std::move(close_handler)),
errorHandler(std::move(error_handler))
{
BMCWEB_LOG_DEBUG << "Creating new connection " << this;
}
boost::asio::io_context& get_io_context() override
{
return static_cast<boost::asio::io_context&>(
ws.get_executor().context());
}
void start()
{
BMCWEB_LOG_DEBUG << "starting connection " << this;
using bf = boost::beast::http::field;
std::string_view protocol = req[bf::sec_websocket_protocol];
// Perform the websocket upgrade
ws.async_accept_ex(
req,
[protocol{std::string(protocol)}](
boost::beast::websocket::response_type& m) {
if (!protocol.empty())
{
m.insert(bf::sec_websocket_protocol, protocol);
}
m.insert(bf::strict_transport_security, "max-age=31536000; "
"includeSubdomains; "
"preload");
m.insert(bf::pragma, "no-cache");
m.insert(bf::cache_control, "no-Store,no-Cache");
m.insert("Content-Security-Policy", "default-src 'self'");
m.insert("X-XSS-Protection", "1; "
"mode=block");
m.insert("X-Content-Type-Options", "nosniff");
},
[this, self(shared_from_this())](boost::system::error_code ec) {
if (ec)
{
BMCWEB_LOG_ERROR << "Error in ws.async_accept " << ec;
return;
}
acceptDone();
});
}
void sendBinary(const std::string_view msg) override
{
ws.binary(true);
outBuffer.emplace_back(msg);
doWrite();
}
void sendBinary(std::string&& msg) override
{
ws.binary(true);
outBuffer.emplace_back(std::move(msg));
doWrite();
}
void sendText(const std::string_view msg) override
{
ws.text(true);
outBuffer.emplace_back(msg);
doWrite();
}
void sendText(std::string&& msg) override
{
ws.text(true);
outBuffer.emplace_back(std::move(msg));
doWrite();
}
void close(const std::string_view msg) override
{
ws.async_close(
boost::beast::websocket::close_code::normal,
[self(shared_from_this())](boost::system::error_code ec) {
if (ec == boost::asio::error::operation_aborted)
{
return;
}
if (ec)
{
BMCWEB_LOG_ERROR << "Error closing websocket " << ec;
return;
}
});
}
void acceptDone()
{
BMCWEB_LOG_DEBUG << "Websocket accepted connection";
auto asyncResp = std::make_shared<bmcweb::AsyncResp>(
res, [this, self(shared_from_this())]() { doRead(); });
asyncResp->res.result(boost::beast::http::status::ok);
if (openHandler)
{
openHandler(*this, asyncResp);
}
}
void doRead()
{
ws.async_read(inBuffer,
[this, self(shared_from_this())](
boost::beast::error_code ec, std::size_t bytes_read) {
if (ec)
{
if (ec != boost::beast::websocket::error::closed)
{
BMCWEB_LOG_ERROR << "doRead error " << ec;
}
if (closeHandler)
{
std::string_view reason = ws.reason().reason;
closeHandler(*this, std::string(reason));
}
return;
}
if (messageHandler)
{
messageHandler(*this, inString, ws.got_text());
}
inBuffer.consume(bytes_read);
inString.clear();
doRead();
});
}
void doWrite()
{
// If we're already doing a write, ignore the request, it will be picked
// up when the current write is complete
if (doingWrite)
{
return;
}
if (outBuffer.empty())
{
// Done for now
return;
}
doingWrite = true;
ws.async_write(
boost::asio::buffer(outBuffer.front()),
[this, self(shared_from_this())](boost::beast::error_code ec,
std::size_t bytes_written) {
doingWrite = false;
outBuffer.erase(outBuffer.begin());
if (ec == boost::beast::websocket::error::closed)
{
// Do nothing here. doRead handler will call the
// closeHandler.
close("Write error");
return;
}
if (ec)
{
BMCWEB_LOG_ERROR << "Error in ws.async_write " << ec;
return;
}
doWrite();
});
}
private:
boost::beast::websocket::stream<Adaptor> ws;
std::string inString;
boost::asio::dynamic_string_buffer<std::string::value_type,
std::string::traits_type,
std::string::allocator_type>
inBuffer;
std::vector<std::string> outBuffer;
bool doingWrite = false;
std::function<void(Connection&, std::shared_ptr<bmcweb::AsyncResp>)>
openHandler;
std::function<void(Connection&, const std::string&, bool)> messageHandler;
std::function<void(Connection&, const std::string&)> closeHandler;
std::function<void(Connection&)> errorHandler;
};
} // namespace websocket
} // namespace crow
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