242 lines
7 KiB
C++
242 lines
7 KiB
C++
#include <cstdio>
|
|
#include <thread>
|
|
#include <chrono>
|
|
#include <cstring>
|
|
#include <cstdlib>
|
|
#include <csignal>
|
|
#include <unordered_map>
|
|
#include <atomic>
|
|
|
|
#include "lua.hpp"
|
|
#include "ws2811.h"
|
|
#include "interpreter_config.h"
|
|
#include "log.h"
|
|
|
|
#include "httplib.h"
|
|
|
|
|
|
#define TARGET_FREQ WS2811_TARGET_FREQ
|
|
#define GPIO_PIN 18
|
|
#define DMA 10
|
|
#define STRIP_TYPE WS2811_STRIP_GBR // WS2812/SK6812RGB integrated chip+leds
|
|
#define LED_COUNT 690
|
|
|
|
#define FPS 15
|
|
|
|
int frametime = 1000 / FPS;
|
|
|
|
std::unordered_map<lua_State*, InterpreterConfig*> statemap;
|
|
std::atomic<std::uint64_t> framecounter = 0;
|
|
|
|
ws2811_t ledstring =
|
|
{
|
|
.freq = TARGET_FREQ,
|
|
.dmanum = DMA,
|
|
.channel =
|
|
{
|
|
[0] =
|
|
{
|
|
.gpionum = GPIO_PIN,
|
|
.invert = 0,
|
|
.count = LED_COUNT,
|
|
.strip_type = WS2811_STRIP_GBR,
|
|
.brightness = 255,
|
|
},
|
|
[1] =
|
|
{
|
|
.gpionum = 0,
|
|
.invert = 0,
|
|
.count = 0,
|
|
.brightness = 0,
|
|
},
|
|
},
|
|
};
|
|
|
|
extern "C" {
|
|
static int c_override_print (lua_State *L) {
|
|
int n = lua_gettop(L); /* number of arguments */
|
|
int i;
|
|
for (i = 1; i <= n; i++) { /* for each argument */
|
|
size_t l;
|
|
const char *s = luaL_tolstring(L, i, &l); /* convert it to string */
|
|
if (i > 1) /* not the first element? */
|
|
statemap[L]->logger << '\t'; /* add a tab before it */
|
|
statemap[L]->logger << s; /* print it */
|
|
lua_pop(L, 1); /* pop result */
|
|
}
|
|
statemap[L]->logger << '\n';
|
|
return 0;
|
|
}
|
|
|
|
static int c_led (lua_State *L) {
|
|
int virtual_location = luaL_checkinteger(L, 1);
|
|
int red = luaL_checkinteger(L, 2);
|
|
int green = luaL_checkinteger(L, 3);
|
|
int blue = luaL_checkinteger(L, 4);
|
|
InterpreterConfig* config = statemap[L];
|
|
|
|
// Lua is one-based, let's keep it consistent and also make our API one-based
|
|
if (virtual_location <= 0 || virtual_location > (int) config->length) {
|
|
std::ostringstream errstream;
|
|
errstream << "setting led " << virtual_location << " of strip with lenght " << config->length << "";
|
|
luaL_argerror(L, 1, errstream.str().c_str());
|
|
return 0;
|
|
} else if (red < 0 || red > 0xff) {
|
|
std::ostringstream errstream;
|
|
errstream << "setting red channel to " << red << " but should be between 0 and 255";
|
|
luaL_argerror(L, 2, errstream.str().c_str());
|
|
return 0;
|
|
} else if (green < 0 || green > 0xff) {
|
|
std::ostringstream errstream;
|
|
errstream << "setting green channel to " << green << " but should be between 0 and 255";
|
|
luaL_argerror(L, 3, errstream.str().c_str());
|
|
return 0;
|
|
} else if (blue < 0 || blue > 0xff) {
|
|
std::ostringstream errstream;
|
|
errstream << "setting blue channel to " << blue << " but should be between 0 and 255";
|
|
luaL_argerror(L, 4, errstream.str().c_str());
|
|
return 0;
|
|
}
|
|
unsigned int real_location = config->begin + virtual_location - 1;
|
|
// TODO remove this debugging line
|
|
printf("Setting led %d to %d %d %d\n", real_location, red, green, blue);
|
|
ledstring.channel[0].leds[real_location] = (red << 16) | (green << 8)| blue;
|
|
return 0;
|
|
}
|
|
|
|
static int c_ledamount(lua_State *L) {
|
|
lua_pushinteger(L, statemap[L]->length);
|
|
return 1;
|
|
}
|
|
|
|
static int c_delay(lua_State *L) {
|
|
int millis = luaL_checkinteger (L, 1);
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(millis));
|
|
return 0;
|
|
}
|
|
|
|
static int c_waitframes(lua_State *L) {
|
|
int amount = luaL_checkinteger(L, 1);
|
|
uint64_t destination = amount + framecounter;
|
|
if (amount >= 2 * FPS) {
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(1000 * ((amount / FPS) - 1)));
|
|
}
|
|
while (framecounter <= destination) {
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(frametime / 2));
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
// Thanks to https://www.stefanmisik.com/post/sandboxing-lua-from-c.html
|
|
static void LuaLoadAndUndefine(lua_State* L, lua_CFunction openFunction, const char* moduleName, const char* functions[])
|
|
{
|
|
/* Load the module, the module table gets placed on the top of the stack */
|
|
luaL_requiref(L, moduleName, openFunction, 1);
|
|
|
|
/* Undefine the unwanted functions */
|
|
for (int i = 0; functions[i] != NULL; i++)
|
|
{
|
|
lua_pushnil(L);
|
|
lua_setfield(L, -2, functions[i]);
|
|
}
|
|
|
|
/* Pop the module table */
|
|
lua_pop(L, 1);
|
|
}
|
|
|
|
lua_State* setup_lua_sandbox(const char* luacode) {
|
|
lua_State* L = luaL_newstate();
|
|
L = luaL_newstate();
|
|
if (!L) {
|
|
return nullptr;
|
|
}
|
|
|
|
static const char* remove_base[] = {"assert",
|
|
"collectgarbage", "dofile", "getmetatable", "loadfile", "load",
|
|
"loadstring", "rawequal", "rawlen", "rawget", "rawset",
|
|
"setmetatable", "print", NULL};
|
|
LuaLoadAndUndefine(L, luaopen_base, "_G", remove_base);
|
|
static const char* remove_str[] = {"dump", NULL};
|
|
LuaLoadAndUndefine(L, luaopen_string, LUA_STRLIBNAME, remove_str);
|
|
|
|
static const char* all_allowed[] = {NULL};
|
|
LuaLoadAndUndefine(L, luaopen_table, LUA_TABLIBNAME, all_allowed);
|
|
LuaLoadAndUndefine(L, luaopen_math, LUA_MATHLIBNAME, all_allowed);
|
|
|
|
lua_pushcfunction(L, c_led);
|
|
lua_setglobal(L, "led");
|
|
lua_pushcfunction(L, c_ledamount);
|
|
lua_setglobal(L, "ledamount");
|
|
lua_pushcfunction(L, c_delay);
|
|
lua_setglobal(L, "delay");
|
|
lua_pushcfunction(L, c_waitframes);
|
|
lua_setglobal(L, "waitframes");
|
|
lua_pushcfunction(L, c_override_print);
|
|
lua_setglobal(L, "print");
|
|
|
|
luaL_loadbuffer(L, luacode, strlen(luacode), "script");
|
|
return L;
|
|
}
|
|
|
|
int execute_lua_sandbox(lua_State* L) {
|
|
int ret = lua_pcall(L, 0, 0, 0);
|
|
if (ret != 0) {
|
|
statemap[L]->logger << "CRASH: " << lua_tostring(L, -1) << '\n';
|
|
lua_close(L);
|
|
return 1;
|
|
}
|
|
lua_close(L);
|
|
return 0;
|
|
}
|
|
|
|
std::thread spawn_lua_tread(const char* luacode, InterpreterConfig* config) {
|
|
lua_State* L = setup_lua_sandbox(luacode);
|
|
statemap[L] = config;
|
|
std::thread t(execute_lua_sandbox, L);
|
|
return t;
|
|
}
|
|
|
|
void signal_callback_handler(int signum) {
|
|
(void) signum;
|
|
ws2811_fini(&ledstring);
|
|
exit(1);
|
|
}
|
|
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
InterpreterConfig* config = new InterpreterConfig {
|
|
.begin = 0,
|
|
.length = 10,
|
|
.enabled = true
|
|
};
|
|
std::thread t = spawn_lua_tread("print(\"hi\")\nled(0, 0, 0, 0)\ndelay(0)\nled(0, 0, 0, 0)\nprint(\"hi\")", config);
|
|
|
|
|
|
t.join();
|
|
httplib::Server svr;
|
|
|
|
svr.Get("/hi", [](const httplib::Request &, httplib::Response &res) {
|
|
res.set_content("Hello World!", "text/plain");
|
|
});
|
|
|
|
svr.listen("0.0.0.0", 8080);
|
|
|
|
ws2811_return_t ret;
|
|
if ((ret = ws2811_init(&ledstring)) != WS2811_SUCCESS)
|
|
{
|
|
fprintf(stderr, "ws2811_init failed: %s\n", ws2811_get_return_t_str(ret));
|
|
return ret;
|
|
}
|
|
signal(SIGINT, signal_callback_handler);
|
|
signal(SIGHUP, signal_callback_handler);
|
|
signal(SIGTERM, signal_callback_handler);
|
|
|
|
ledstring.channel[0].leds[0] = 0x0000ff00;
|
|
|
|
while (true) {
|
|
ws2811_render(&ledstring);
|
|
std::this_thread::sleep_for(std::chrono::milliseconds(frametime));
|
|
}
|
|
} |