mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-23 00:00:01 +01:00
154 lines
2.9 KiB
C++
154 lines
2.9 KiB
C++
/* Simple WebSocket relay facilitating client-to-client connections.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <memory>
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#include <vector>
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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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reserve(LWS_PRE);
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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() { return std::vector<uint8_t>::data() + LWS_PRE; }
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size_type size() { return std::vector<uint8_t>::size() - LWS_PRE; }
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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,
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void *user, void *in, size_t len);
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static int protocolCallback(lws *wsi, enum lws_callback_reasons reason,
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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) { stop = true; }
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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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