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main.cpp
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// This file is part of SmallBASIC
//
// This program is distributed under the terms of the GPL v2.0 or later
// Download the GNU Public License (GPL) from www.gnu.org
//
// Copyright(C) 2020 Chris Warren-Smith
#include "config.h"
#include <string.h>
#include <signal.h>
#include <unordered_map>
#include <vector>
#include <string>
extern "C" {
#include "mongoose/mongoose.h"
}
#include "include/var.h"
#include "include/module.h"
#include "include/param.h"
#define MAX_POLL_SLEEP 40
sig_atomic_t signalReceived = 0;
mg_mgr manager;
struct Session;
std::unordered_map<int, Session *> sessions;
enum ConnectionState {
kInit = 0,
kClient,
kServer,
kClosed
};
struct Session {
Session() :
_conn(nullptr),
_state(kInit),
_handle(-1) {
}
Session(mg_connection *conn) :
_conn(conn),
_state(kInit),
_handle(conn->id) {
sessions[_handle] = this;
}
virtual ~Session() {
if (_handle != -1) {
sessions.erase(_handle);
}
}
void setConnection(mg_connection *conn) {
_conn = conn;
_handle = _conn->id;
sessions[_handle] = this;
}
std::string _send;
std::string _recv;
std::vector<Session *> _conns;
mg_connection *_conn;
ConnectionState _state;
int _handle;
};
static void signal_handler(int sig_num) {
signal(sig_num, signal_handler);
signalReceived = sig_num;
}
static void send(mg_connection *conn, const char *msg, int len) {
mg_ws_send(conn, msg, len, WEBSOCKET_OP_TEXT);
}
static void server_http_msg(mg_connection *conn, mg_http_message *message, Session *session) {
if (mg_match(message->uri, mg_str("/"), NULL)) {
mg_ws_upgrade(conn, message, NULL);
session->_conns.push_back(new Session(conn));
} else {
mg_http_reply(conn, 200, "", session->_send.c_str());
}
}
static void server_send(Session *session, const char *buf, size_t len, int id) {
if (id != -1) {
Session *target = sessions[id];
if (target != nullptr) {
send(target->_conn, buf, len);
}
} else {
for (auto it = session->_conns.begin(); it != session->_conns.end();) {
send((*it)->_conn, buf, len);
it++;
}
}
}
static void server_ws_msg(mg_connection *conn, mg_ws_message *message) {
Session *session = sessions[conn->id];
if (session != nullptr) {
session->_recv.append((char *)message->data.buf, message->data.len);
}
mg_iobuf_del(&conn->recv, 0, conn->recv.len);
}
static void server_ev_close(mg_connection *conn, Session *session) {
for (auto it = session->_conns.begin(); it != session->_conns.end();) {
if ((*it)->_conn == conn) {
Session *next = *it;
delete next;
it = session->_conns.erase(it);
} else {
it++;
}
}
if (session->_handle == (int)conn->id) {
delete session;
}
}
static void server_handler(struct mg_connection *conn, int event, void *eventData) {
switch (event) {
case MG_EV_HTTP_MSG:
server_http_msg(conn, (mg_http_message *)eventData, (Session *)conn->fn_data);
break;
case MG_EV_WS_MSG:
server_ws_msg(conn, (mg_ws_message *)eventData);
break;
case MG_EV_CLOSE:
server_ev_close(conn, (Session *)conn->fn_data);
break;
default:
break;
}
}
static void server_receive(var_t *retval, Session *session) {
for (auto it = session->_conns.begin(); it != session->_conns.end();) {
Session *next = *it;
if (!next->_recv.empty()) {
map_init(retval);
v_setint(map_add_var(retval, "id", 0), next->_handle);
v_setstr(map_add_var(retval, "data", 0), next->_recv.c_str());
next->_recv.clear();
break;
}
it++;
}
}
static void client_ws_open(mg_connection *conn, Session *session) {
session->_state = kClient;
if (!session->_send.empty()) {
send(conn, session->_send.c_str(), session->_send.length());
session->_send.clear();
}
}
static void client_ws_msg(mg_connection *conn, mg_ws_message *message, Session *session) {
if (message->data.len && session->_state == kClient) {
if (!session->_recv.empty()) {
session->_recv.insert(0, (char *)message->data.buf, message->data.len);
} else {
session->_recv.append((char *)message->data.buf, message->data.len);
}
}
}
static void client_handler(mg_connection *conn, int event, void *eventData) {
switch (event) {
case MG_EV_ERROR:
fprintf(stderr, "ERROR: [%p] %s", conn->fd, (char *)eventData);
break;
case MG_EV_WS_OPEN:
client_ws_open(conn, (Session *)conn->fn_data);
break;
case MG_EV_WS_MSG:
client_ws_msg(conn, (mg_ws_message *)eventData, (Session *)conn->fn_data);
break;
case MG_EV_CLOSE:
((Session *)conn->fn_data)->_state = kClosed;
break;
default:
break;
}
}
static void set_session(var_p_t var, Session *session, mg_connection *conn) {
session->setConnection(conn);
map_init_id(var, conn->id);
v_setstr(map_add_var(var, "local_ip", 0), (const char *)conn->loc.ip);
v_setint(map_add_var(var, "local_port", 0), conn->loc.port);
v_setstr(map_add_var(var, "remote_ip", 0), (const char *)conn->rem.ip);
v_setint(map_add_var(var, "remote_port", 0), conn->rem.port);
}
static Session *get_session(int argc, slib_par_t *params, var_t *retval) {
Session *result;
if (is_param_map(argc, params, 0)) {
result = sessions[params[0].var_p->v.m.id];
} else {
result = nullptr;
}
if (result == nullptr) {
v_setstr(retval, "Invalid connection");
} else if (result->_state == kClosed) {
v_setstr(retval, "Connection closed");
delete result;
result = nullptr;
}
return result;
}
//
// ws.close(conn)
//
static int cmd_close(int argc, slib_par_t *params, var_t *retval) {
auto session = get_session(argc, params, retval);
if (session != nullptr && session->_conn != nullptr) {
session->_conn->is_closing = 1;
}
return session != nullptr;
}
//
// msg = ws.receive(conn)
//
static int cmd_receive(int argc, slib_par_t *params, var_t *retval) {
auto session = get_session(argc, params, retval);
if (session != nullptr) {
if (session->_state == kServer) {
server_receive(retval, session);
} else {
v_setstr(retval, session->_recv.c_str());
}
session->_recv.clear();
}
return session != nullptr;
}
//
// while ws.open(conn)
//
static int cmd_open(int argc, slib_par_t *params, var_t *retval) {
auto session = get_session(argc, params, retval);
if (session != nullptr) {
v_setint(retval, session->_state != kClosed && signalReceived == 0);
}
return session != nullptr;
}
//
// ws.send(conn, "hello", [clientId])
//
static int cmd_send(int argc, slib_par_t *params, var_t *retval) {
auto session = get_session(argc, params, retval);
if (session != nullptr) {
const char *message = get_param_str(argc, params, 1, nullptr);
if (message != nullptr && message[0] != '\0') {
int id = get_param_int(argc, params, 2, -1);
switch (session->_state) {
case kInit:
session->_send.append(message);
break;
case kClient:
send(session->_conn, message, strlen(message));
break;
case kServer:
server_send(session, message, strlen(message), id);
break;
case kClosed:
v_setstr(retval, "Connection closed");
session = nullptr;
break;
}
} else {
v_setstr(retval, "Send failed");
session = nullptr;
}
}
return session != nullptr;
}
//
// conn = ws.create("ws://127.0.0.1:8000")
//
static int cmd_create(int argc, slib_par_t *params, var_t *retval) {
int result = 0;
const char *url = get_param_str(argc, params, 0, nullptr);
if (url != nullptr) {
auto session = new Session();
mg_connection *conn = mg_ws_connect(&manager, url, client_handler, session, nullptr);
if (conn == nullptr) {
delete session;
v_setstr(retval, "Connection failed");
} else {
set_session(retval, session, conn);
result = 1;
}
} else {
v_setstr(retval, "Invalid url");
}
return result;
}
//
// conn = ws.listen("http://localhost:8000/websocket")
//
static int cmd_listen(int argc, slib_par_t *params, var_t *retval) {
int result = 0;
const char *url = get_param_str(argc, params, 0, nullptr);
if (url != nullptr) {
auto session = new Session();
mg_connection *conn = mg_http_listen(&manager, url, server_handler, session);
if (conn == nullptr) {
delete session;
v_setstr(retval, "Listen failed");
} else {
session->_state = kServer;
set_session(retval, session, conn);
result = 1;
}
}
return result;
}
API lib_func[] = {
{"CREATE", cmd_create},
{"OPEN", cmd_open},
{"LISTEN", cmd_listen},
{"RECEIVE", cmd_receive},
};
int sblib_func_count() {
return (sizeof(lib_func) / sizeof(lib_func[0]));
}
int sblib_func_getname(int index, char *proc_name) {
int result;
if (index < sblib_func_count()) {
strcpy(proc_name, lib_func[index].name);
result = 1;
} else {
result = 0;
}
return result;
}
int sblib_func_exec(int index, int argc, slib_par_t *params, var_t *retval) {
int result;
if (index < sblib_func_count()) {
result = lib_func[index].command(argc, params, retval);
} else {
result = 0;
}
return result;
}
API lib_proc[] = {
{"SEND", cmd_send},
{"CLOSE", cmd_close}
};
int sblib_proc_count() {
return (sizeof(lib_proc) / sizeof(lib_proc[0]));
}
int sblib_proc_getname(int index, char *proc_name) {
int result;
if (index < sblib_proc_count()) {
strcpy(proc_name, lib_proc[index].name);
result = 1;
} else {
result = 0;
}
return result;
}
int sblib_proc_exec(int index, int argc, slib_par_t *params, var_t *retval) {
int result;
if (index < sblib_proc_count()) {
result = lib_proc[index].command(argc, params, retval);
} else {
result = 0;
}
return result;
}
int sblib_events(int wait_flag, int *w, int *h) {
if (!signalReceived) {
mg_mgr_poll(&manager, MAX_POLL_SLEEP);
}
return signalReceived ? -2 : 0;
}
int sblib_init(const char *sourceFile) {
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
mg_mgr_init(&manager);
return 1;
}
void sblib_close(void) {
mg_mgr_free(&manager);
for (unsigned i = 0; i < sessions.size(); i++) {
delete sessions[i];
}
}