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178 lines
5.9 KiB
178 lines
5.9 KiB
#pragma once
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#include <iostream>
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#include <string>
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#include <memory>
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#include <functional>
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#include <stdexcept>
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#include <syslog.h>
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#include <getopt.h>
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#include <signal.h>
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#include <string.h>
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#include <lib/libwebsockets.h>
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namespace websockets {
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// Will be caught in the callback and program will continue to run (but connection will be closed)
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struct runtime_error : public std::runtime_error {
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int return_value;
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runtime_error(const char * message, int return_value = -1)
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: std::runtime_error(message)
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, return_value(return_value)
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{}
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};
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// Will never be caught (by us), and hence things will terminate
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struct fatal_error : public std::runtime_error {
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fatal_error(const char * message)
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: std::runtime_error(message)
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{}
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};
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struct Log {
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Log(std::string const & name, int syslog_options, int debug_level){
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setlogmask(LOG_UPTO (LOG_DEBUG));
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openlog(name.c_str(), syslog_options, LOG_DAEMON);
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lws_set_log_level(debug_level, lwsl_emit_syslog);
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}
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#define log_function(nice_name, lwsl_name)\
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template <typename... T>\
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void nice_name(std::string const & format, T... args){\
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lwsl_name(format.c_str(), args...);\
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}
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log_function(notice, lwsl_notice)
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log_function(error, lwsl_err)
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log_function(warning, lwsl_warn)
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log_function(debug, lwsl_debug)
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#undef log_function
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~Log(){
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closelog();
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}
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};
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// Basic wrapper for the context pointer
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struct Context {
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std::unique_ptr<libwebsocket_context, decltype(libwebsocket_context_destroy)*> context;
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Context(lws_context_creation_info& info)
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: context(libwebsocket_create_context(&info), &libwebsocket_context_destroy)
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{
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if(context == nullptr){
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lwsl_err("libwebsocket init failed\n");
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throw std::runtime_error("libwebsocket init failed");
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}
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}
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libwebsocket_context const * get_raw() const {
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return context.get();
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}
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libwebsocket_context * get_raw() {
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return context.get();
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}
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};
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// Basic protocol to extend, already casts the void* to the actual type
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template <typename T>
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struct Protocol {
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typedef T user_type;
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int callback(libwebsocket_context *context, libwebsocket *wsi, libwebsocket_callback_reasons reason, void *user, void *in, size_t len){
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return call(*context, *wsi, reason, *static_cast<T*>(user), in, len);
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}
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virtual int call(libwebsocket_context& context, libwebsocket& wsi, libwebsocket_callback_reasons reason, T& user, void *in, size_t len){
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return 0;
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}
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};
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struct basic_websocket_info{
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libwebsocket_context* context{nullptr};
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libwebsocket* wsi{nullptr};
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basic_websocket_info(libwebsocket_context* context, libwebsocket* wsi)
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: context(context)
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, wsi(wsi)
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{}
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};
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inline void request_write(basic_websocket_info const & binfo){
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libwebsocket_callback_on_writable(binfo.context, binfo.wsi);
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}
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// 4-function Protocol, provide functions to handle establishment, closing, receiving and writing (follows receiving)
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// To let the callback return something non-zero (in case of error), use websockets::runtime_error
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// Only types with no-arg ctor are allowed (uses placement new, because libwebsockets allocates for us)
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template <typename T>
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struct TestProtocol {
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typedef T user_type;
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std::function<void(user_type&, basic_websocket_info)> establish_func;
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std::function<void(user_type&, basic_websocket_info)> close_func;
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std::function<std::string(user_type&, basic_websocket_info)> write_func;
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std::function<void(user_type&, std::string, basic_websocket_info)> receive_func;
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bool verbose{false};
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TestProtocol(decltype(establish_func) establish_func, decltype(close_func) close_func, decltype(write_func) write_func, decltype(receive_func) receive_func)
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: establish_func(establish_func)
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, close_func(close_func)
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, write_func(write_func)
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, receive_func(receive_func)
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{}
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int callback(libwebsocket_context* context, libwebsocket* wsi, libwebsocket_callback_reasons reason, void* user_ptr, void *in, size_t len){
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user_type& user = *static_cast<user_type*>(user_ptr);
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basic_websocket_info binfo{context, wsi};
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try{
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switch (reason) {
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case LWS_CALLBACK_ESTABLISHED:
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if(verbose) lwsl_notice("Connection established (%p, %p)\n", this, user_ptr);
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new (user_ptr) user_type();
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establish_func(user, binfo);
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break;
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case LWS_CALLBACK_CLOSED:
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if(verbose) lwsl_notice("Connection closed (%p, %p)\n", this, user_ptr);
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close_func(user, binfo);
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user.~user_type();
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:{
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std::string string_to_send = write_func(user, binfo);
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if(verbose) std::cout << string_to_send << std::endl;
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// we need the extra bytes padding on both sides :(
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unsigned char * buf = new unsigned char [LWS_SEND_BUFFER_PRE_PADDING + string_to_send.size() + LWS_SEND_BUFFER_POST_PADDING];
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memcpy(&buf[LWS_SEND_BUFFER_PRE_PADDING], string_to_send.c_str(), string_to_send.size());
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int n = libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING], string_to_send.size(), LWS_WRITE_TEXT);
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if (n < 0) throw runtime_error("Could not write", 1);
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if (n < string_to_send.size()) throw runtime_error("Partial write", -1);
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break;
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}
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case LWS_CALLBACK_RECEIVE:
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receive_func(user, std::string((char*)in, len), binfo);
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break;
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default:
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break;
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}
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} catch(runtime_error& e){
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lwsl_err("Exception thrown: %s", e.what());
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return e.return_value;
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}
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return 0;
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}
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};
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// Some wrappers to easily create the list of protocols from structs of above kind.
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#define WSprotocol_callback(protocol)\
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[](libwebsocket_context *context, libwebsocket *wsi, libwebsocket_callback_reasons reason, void *user, void *in, size_t len)\
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{return protocol.callback(context, wsi, reason, user, in, len);}
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#define WSstandard_protocol(name, protocol)\
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{ name, WSprotocol_callback(protocol), sizeof(decltype(protocol)::user_type) }
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int default_main(int argc, char **argv, libwebsocket_protocols* protocols, std::function<void()> runloop_callback = nullptr);
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} // namespace websockets
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