mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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174 lines
3.5 KiB
C++
174 lines
3.5 KiB
C++
/** Simple WebSocket relay facilitating client-to-client connections.
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <vector>
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#include <memory>
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#include <uuid/uuid.h>
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#include <libwebsockets.h>
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#include <villas/log.hpp>
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namespace villas {
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namespace node {
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namespace tools {
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/* Forward declarations */
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class Relay;
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class RelaySession;
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class RelayConnection;
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class InvalidUrlException { };
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typedef std::string Identifier;
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class Frame : public std::vector<uint8_t> {
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public:
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Frame() {
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/* lws_write() requires LWS_PRE bytes in front of the payload */
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insert(end(), LWS_PRE, 0);
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}
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uint8_t * data() {
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return std::vector<uint8_t>::data() + LWS_PRE;
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}
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size_type size() {
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return std::vector<uint8_t>::size() - LWS_PRE;
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}
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};
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class RelaySession {
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friend RelayConnection;
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friend Relay;
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protected:
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time_t created;
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uuid_t uuid;
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Identifier identifier;
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Logger logger;
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std::map<lws *, RelayConnection *> connections;
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int connects;
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static std::map<std::string, RelaySession *> sessions;
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public:
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static RelaySession * get(Relay *r, lws *wsi);
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RelaySession(Relay *r, Identifier sid);
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~RelaySession();
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json_t * toJson() const;
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};
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class RelayConnection {
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protected:
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lws *wsi;
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std::shared_ptr<Frame> currentFrame;
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std::queue<std::shared_ptr<Frame>> outgoingFrames;
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RelaySession *session;
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char name[128];
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char ip[128];
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size_t created;
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size_t bytes_recv;
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size_t bytes_sent;
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size_t frames_recv;
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size_t frames_sent;
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bool loopback;
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public:
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RelayConnection(Relay *r, lws *w, bool lo);
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~RelayConnection();
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json_t * toJson() const;
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void write();
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void read(void *in, size_t len);
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};
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class Relay : public Tool {
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public:
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friend RelaySession;
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Relay(int argc, char *argv[]);
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protected:
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std::atomic<bool> stop;
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/** The libwebsockets server context. */
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lws_context *context;
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/** The libwebsockets vhost. */
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lws_vhost *vhost;
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bool loopback;
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int port;
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std::string protocol;
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std::string hostname;
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uuid_t uuid;
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/** List of libwebsockets protocols. */
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std::vector<lws_protocols> protocols;
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/** List of libwebsockets extensions. */
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static const std::vector<lws_extension> extensions;
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static const lws_http_mount mount;
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static void loggerCallback(int level, const char *msg);
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static int httpProtocolCallback(lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len);
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static int protocolCallback(lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len);
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void usage();
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void parse();
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int main();
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void handler(int signal, siginfo_t *sinfo, void *ctx)
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{
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stop = true;
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}
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};
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} /* namespace tools */
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} /* namespace node */
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} /* namespace villas */
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