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rpm/rpmio/rpmlua.c

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#include "system.h"
#ifdef WITH_LUA
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <lposix.h>
#include <lrexlib.h>
#include <unistd.h>
#include <assert.h>
#include <rpm/rpmio.h>
#include <rpm/rpmmacro.h>
#include <rpm/rpmlog.h>
#include <rpm/rpmurl.h>
#include "rpmio/rpmhook.h"
#define _RPMLUA_INTERNAL
#include "rpmio/rpmlua.h"
#include "debug.h"
#define INITSTATE(_lua, lua) \
rpmlua lua = _lua ? _lua : \
(globalLuaState ? globalLuaState : \
\
(globalLuaState = rpmluaNew()) \
\
)
static rpmlua globalLuaState = NULL;
static int luaopen_rpm(lua_State *L);
static int rpm_print(lua_State *L);
rpmlua rpmluaNew()
{
rpmlua lua = (rpmlua) xcalloc(1, sizeof(*lua));
struct stat st;
const luaL_reg *lib;
static const luaL_reg extlibs[] = {
{"posix", luaopen_posix},
{"rex", luaopen_rex},
{"rpm", luaopen_rpm},
{NULL, NULL},
};
lua_State *L = lua_open();
luaL_openlibs(L);
lua->L = L;
for (lib = extlibs; lib->name; lib++) {
lua_pushcfunction(L, lib->func);
lua_pushstring(L, lib->name);
lua_call(L, 1, 0);
lua_settop(L, 0);
}
lua_pushliteral(L, "LUA_PATH");
lua_pushstring(L, RPMCONFIGDIR "/lua/?.lua");
lua_rawset(L, LUA_GLOBALSINDEX);
lua_pushliteral(L, "print");
lua_pushcfunction(L, rpm_print);
lua_rawset(L, LUA_GLOBALSINDEX);
rpmluaSetData(lua, "lua", lua);
if (stat(RPMCONFIGDIR "/init.lua", &st) != -1)
(void)rpmluaRunScriptFile(lua, RPMCONFIGDIR "/init.lua");
return lua;
}
void *rpmluaFree(rpmlua lua)
{
if (lua) {
if (lua->L) lua_close(lua->L);
free(lua->printbuf);
free(lua);
}
return NULL;
}
void rpmluaSetData(rpmlua _lua, const char *key, const void *data)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
lua_pushliteral(L, "rpm_");
lua_pushstring(L, key);
lua_concat(L, 2);
if (data == NULL)
lua_pushnil(L);
else
lua_pushlightuserdata(L, (void *)data);
lua_rawset(L, LUA_REGISTRYINDEX);
}
static void *getdata(lua_State *L, const char *key)
{
void *ret = NULL;
lua_pushliteral(L, "rpm_");
lua_pushstring(L, key);
lua_concat(L, 2);
lua_rawget(L, LUA_REGISTRYINDEX);
if (lua_islightuserdata(L, -1))
ret = lua_touserdata(L, -1);
lua_pop(L, 1);
return ret;
}
void *rpmluaGetData(rpmlua _lua, const char *key)
{
INITSTATE(_lua, lua);
return getdata(lua->L, key);
}
void rpmluaSetPrintBuffer(rpmlua _lua, int flag)
{
INITSTATE(_lua, lua);
lua->storeprint = flag;
free(lua->printbuf);
lua->printbuf = NULL;
lua->printbufsize = 0;
lua->printbufused = 0;
}
const char *rpmluaGetPrintBuffer(rpmlua _lua)
{
INITSTATE(_lua, lua);
return lua->printbuf;
}
static int pushvar(lua_State *L, rpmluavType type, void *value)
{
int ret = 0;
switch (type) {
case RPMLUAV_NIL:
lua_pushnil(L);
break;
case RPMLUAV_STRING:
lua_pushstring(L, *((char **)value));
break;
case RPMLUAV_NUMBER:
lua_pushnumber(L, *((double *)value));
break;
default:
ret = -1;
break;
}
return ret;
}
void rpmluaSetVar(rpmlua _lua, rpmluav var)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
if (var->listmode && lua->pushsize > 0) {
if (var->keyType != RPMLUAV_NUMBER || var->key.num == (double)0) {
var->keyType = RPMLUAV_NUMBER;
var->key.num = (double) luaL_getn(L, -1);
}
var->key.num++;
}
if (!var->listmode || lua->pushsize > 0) {
if (lua->pushsize == 0)
lua_pushvalue(L, LUA_GLOBALSINDEX);
if (pushvar(L, var->keyType, &var->key) != -1) {
if (pushvar(L, var->valueType, &var->value) != -1)
lua_rawset(L, -3);
else
lua_pop(L, 1);
}
if (lua->pushsize == 0)
lua_pop(L, 1);
}
}
static void popvar(lua_State *L, rpmluavType *type, void *value)
{
switch (lua_type(L, -1)) {
case LUA_TSTRING:
*type = RPMLUAV_STRING;
*((const char **)value) = lua_tostring(L, -1);
break;
case LUA_TNUMBER:
*type = RPMLUAV_NUMBER;
*((double *)value) = lua_tonumber(L, -1);
break;
default:
*type = RPMLUAV_NIL;
*((void **)value) = NULL;
break;
}
lua_pop(L, 1);
}
void rpmluaGetVar(rpmlua _lua, rpmluav var)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
if (!var->listmode) {
if (lua->pushsize == 0)
lua_pushvalue(L, LUA_GLOBALSINDEX);
if (pushvar(L, var->keyType, &var->key) != -1) {
lua_rawget(L, -2);
popvar(L, &var->valueType, &var->value);
}
if (lua->pushsize == 0)
lua_pop(L, 1);
} else if (lua->pushsize > 0) {
(void) pushvar(L, var->keyType, &var->key);
if (lua_next(L, -2) != 0)
popvar(L, &var->valueType, &var->value);
}
}
#define FINDKEY_RETURN 0
#define FINDKEY_CREATE 1
#define FINDKEY_REMOVE 2
static int findkey(lua_State *L, int oper, const char *key, va_list va)
{
char *buf;
const char *s, *e;
int ret = 0;
int blen;
blen = vsnprintf(NULL, 0, key, va);
if (blen <= 0) {
return -1;
}
buf = xmalloc(blen + 1);
vsnprintf(buf, blen + 1, key, va);
s = e = buf;
lua_pushvalue(L, LUA_GLOBALSINDEX);
for (;;) {
if (*e == '\0' || *e == '.') {
if (e != s) {
lua_pushlstring(L, s, e-s);
switch (oper) {
case FINDKEY_REMOVE:
if (*e == '\0') {
lua_pushnil(L);
lua_rawset(L, -3);
lua_pop(L, 1);
break;
}
case FINDKEY_RETURN:
lua_rawget(L, -2);
lua_remove(L, -2);
break;
case FINDKEY_CREATE:
lua_rawget(L, -2);
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
lua_newtable(L);
lua_pushlstring(L, s, e-s);
lua_pushvalue(L, -2);
lua_rawset(L, -4);
}
lua_remove(L, -2);
break;
}
}
if (*e == '\0')
break;
if (!lua_istable(L, -1)) {
lua_pop(L, 1);
ret = -1;
break;
}
s = e+1;
}
e++;
}
free(buf);
return ret;
}
void rpmluaDelVar(rpmlua _lua, const char *key, ...)
{
INITSTATE(_lua, lua);
va_list va;
va_start(va, key);
(void) findkey(lua->L, FINDKEY_REMOVE, key, va);
va_end(va);
}
int rpmluaVarExists(rpmlua _lua, const char *key, ...)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
int ret = 0;
va_list va;
va_start(va, key);
if (findkey(L, FINDKEY_RETURN, key, va) == 0) {
if (!lua_isnil(L, -1))
ret = 1;
lua_pop(L, 1);
}
va_end(va);
return ret;
}
void rpmluaPushTable(rpmlua _lua, const char *key, ...)
{
INITSTATE(_lua, lua);
va_list va;
va_start(va, key);
(void) findkey(lua->L, FINDKEY_CREATE, key, va);
lua->pushsize++;
va_end(va);
}
void rpmluaPop(rpmlua _lua)
{
INITSTATE(_lua, lua);
assert(lua->pushsize > 0);
lua->pushsize--;
lua_pop(lua->L, 1);
}
rpmluav rpmluavNew(void)
{
rpmluav var = (rpmluav) xcalloc(1, sizeof(*var));
return var;
}
void *rpmluavFree(rpmluav var)
{
free(var);
return NULL;
}
void rpmluavSetListMode(rpmluav var, int flag)
{
var->listmode = flag;
var->keyType = RPMLUAV_NIL;
}
void rpmluavSetKey(rpmluav var, rpmluavType type, const void *value)
{
var->keyType = type;
switch (type) {
case RPMLUAV_NUMBER:
var->key.num = *((double *)value);
break;
case RPMLUAV_STRING:
var->key.str = (char *)value;
break;
default:
break;
}
}
void rpmluavSetValue(rpmluav var, rpmluavType type, const void *value)
{
var->valueType = type;
switch (type) {
case RPMLUAV_NUMBER:
var->value.num = *((const double *)value);
break;
case RPMLUAV_STRING:
var->value.str = (const char *)value;
break;
default:
break;
}
}
void rpmluavGetKey(rpmluav var, rpmluavType *type, void **value)
{
*type = var->keyType;
switch (var->keyType) {
case RPMLUAV_NUMBER:
*((double **)value) = &var->key.num;
break;
case RPMLUAV_STRING:
*((const char **)value) = var->key.str;
break;
default:
break;
}
}
void rpmluavGetValue(rpmluav var, rpmluavType *type, void **value)
{
*type = var->valueType;
switch (var->valueType) {
case RPMLUAV_NUMBER:
*((double **)value) = &var->value.num;
break;
case RPMLUAV_STRING:
*((const char **)value) = var->value.str;
break;
default:
break;
}
}
void rpmluavSetKeyNum(rpmluav var, double value)
{
rpmluavSetKey(var, RPMLUAV_NUMBER, &value);
}
void rpmluavSetValueNum(rpmluav var, double value)
{
rpmluavSetValue(var, RPMLUAV_NUMBER, &value);
}
double rpmluavGetKeyNum(rpmluav var)
{
rpmluavType type;
void *value;
rpmluavGetKey(var, &type, &value);
if (type == RPMLUAV_NUMBER)
return *((double *)value);
return (double) 0;
}
double rpmluavGetValueNum(rpmluav var)
{
rpmluavType type;
void *value;
rpmluavGetValue(var, &type, &value);
if (type == RPMLUAV_NUMBER)
return *((double *)value);
return (double) 0;
}
int rpmluavKeyIsNum(rpmluav var)
{
return (var->keyType == RPMLUAV_NUMBER) ? 1 : 0;
}
int rpmluavValueIsNum(rpmluav var)
{
return (var->valueType == RPMLUAV_NUMBER) ? 1 : 0;
}
int rpmluaCheckScript(rpmlua _lua, const char *script, const char *name)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
int ret = 0;
if (name == NULL)
name = "<lua>";
if (luaL_loadbuffer(L, script, strlen(script), name) != 0) {
rpmlog(RPMLOG_ERR,
_("invalid syntax in lua scriptlet: %s\n"),
lua_tostring(L, -1));
ret = -1;
}
lua_pop(L, 1); /* Error or chunk. */
return ret;
}
int rpmluaRunScript(rpmlua _lua, const char *script, const char *name)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
int ret = 0;
if (name == NULL)
name = "<lua>";
if (luaL_loadbuffer(L, script, strlen(script), name) != 0) {
rpmlog(RPMLOG_ERR, _("invalid syntax in lua script: %s\n"),
lua_tostring(L, -1));
lua_pop(L, 1);
ret = -1;
} else if (lua_pcall(L, 0, 0, 0) != 0) {
rpmlog(RPMLOG_ERR, _("lua script failed: %s\n"),
lua_tostring(L, -1));
lua_pop(L, 1);
ret = -1;
}
return ret;
}
int rpmluaRunScriptFile(rpmlua _lua, const char *filename)
{
INITSTATE(_lua, lua);
lua_State *L = lua->L;
int ret = 0;
if (luaL_loadfile(L, filename) != 0) {
rpmlog(RPMLOG_ERR, _("invalid syntax in lua file: %s\n"),
lua_tostring(L, -1));
lua_pop(L, 1);
ret = -1;
} else if (lua_pcall(L, 0, 0, 0) != 0) {
rpmlog(RPMLOG_ERR, _("lua script failed: %s\n"),
lua_tostring(L, -1));
lua_pop(L, 1);
ret = -1;
}
return ret;
}
/* From lua.c */
static int rpmluaReadline(lua_State *L, const char *prompt)
{
static char buffer[1024];
if (prompt) {
(void) fputs(prompt, stdout);
(void) fflush(stdout);
}
if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
return 0; /* read fails */
} else {
lua_pushstring(L, buffer);
return 1;
}
}
/* Based on lua.c */
static void _rpmluaInteractive(lua_State *L)
{
(void) fputs("\n", stdout);
printf("RPM Interactive %s Interpreter\n", LUA_VERSION);
for (;;) {
int rc = 0;
if (rpmluaReadline(L, "> ") == 0)
break;
if (lua_tostring(L, -1)[0] == '=') {
(void) lua_pushfstring(L, "print(%s)", lua_tostring(L, -1)+1);
lua_remove(L, -2);
}
for (;;) {
rc = luaL_loadbuffer(L, lua_tostring(L, -1),
lua_strlen(L, -1), "<lua>");
if (rc == LUA_ERRSYNTAX &&
strstr(lua_tostring(L, -1), "near `<eof>'") != NULL) {
if (rpmluaReadline(L, ">> ") == 0)
break;
lua_remove(L, -2); /* Remove error */
lua_concat(L, 2);
continue;
}
break;
}
if (rc == 0)
rc = lua_pcall(L, 0, 0, 0);
if (rc != 0) {
fprintf(stderr, "%s\n", lua_tostring(L, -1));
lua_pop(L, 1);
}
lua_pop(L, 1); /* Remove line */
}
(void) fputs("\n", stdout);
}
void rpmluaInteractive(rpmlua _lua)
{
INITSTATE(_lua, lua);
_rpmluaInteractive(lua->L);
}
/* ------------------------------------------------------------------ */
/* Lua API */
static int rpm_expand(lua_State *L)
{
const char *str = luaL_checkstring(L, 1);
lua_pushstring(L, rpmExpand(str, NULL));
return 1;
}
static int rpm_define(lua_State *L)
{
const char *str = luaL_checkstring(L, 1);
(void) rpmDefineMacro(NULL, str, 0);
return 0;
}
static int rpm_interactive(lua_State *L)
{
_rpmluaInteractive(L);
return 0;
}
typedef struct rpmluaHookData_s {
lua_State *L;
int funcRef;
int dataRef;
} * rpmluaHookData;
static int rpmluaHookWrapper(rpmhookArgs args, void *data)
{
rpmluaHookData hookdata = (rpmluaHookData)data;
lua_State *L = hookdata->L;
int ret = 0;
int i;
lua_rawgeti(L, LUA_REGISTRYINDEX, hookdata->funcRef);
lua_newtable(L);
for (i = 0; i != args->argc; i++) {
switch (args->argt[i]) {
case 's':
lua_pushstring(L, args->argv[i].s);
lua_rawseti(L, -2, i+1);
break;
case 'i':
lua_pushnumber(L, (lua_Number)args->argv[i].i);
lua_rawseti(L, -2, i+1);
break;
case 'f':
lua_pushnumber(L, (lua_Number)args->argv[i].f);
lua_rawseti(L, -2, i+1);
break;
case 'p':
lua_pushlightuserdata(L, args->argv[i].p);
lua_rawseti(L, -2, i+1);
break;
default:
(void) luaL_error(L, "unsupported type '%c' as "
"a hook argument\n", args->argt[i]);
break;
}
}
if (lua_pcall(L, 1, 1, 0) != 0) {
rpmlog(RPMLOG_ERR, _("lua hook failed: %s\n"),
lua_tostring(L, -1));
lua_pop(L, 1);
} else {
if (lua_isnumber(L, -1))
ret = (int)lua_tonumber(L, -1);
lua_pop(L, 1);
}
return ret;
}
static int rpm_register(lua_State *L)
{
if (!lua_isstring(L, 1)) {
(void) luaL_argerror(L, 1, "hook name expected");
} else if (!lua_isfunction(L, 2)) {
(void) luaL_argerror(L, 2, "function expected");
} else {
rpmluaHookData hookdata =
lua_newuserdata(L, sizeof(struct rpmluaHookData_s));
lua_pushvalue(L, -1);
hookdata->dataRef = luaL_ref(L, LUA_REGISTRYINDEX);
lua_pushvalue(L, 2);
hookdata->funcRef = luaL_ref(L, LUA_REGISTRYINDEX);
hookdata->L = L;
rpmhookRegister(lua_tostring(L, 1), rpmluaHookWrapper, hookdata);
return 1;
}
return 0;
}
static int rpm_unregister(lua_State *L)
{
if (!lua_isstring(L, 1)) {
(void) luaL_argerror(L, 1, "hook name expected");
} else if (!lua_islightuserdata(L, 2)) {
(void) luaL_argerror(L, 2, "hook information expected");
} else {
rpmluaHookData hookdata = (rpmluaHookData)lua_touserdata(L, 2);
luaL_unref(L, LUA_REGISTRYINDEX, hookdata->funcRef);
luaL_unref(L, LUA_REGISTRYINDEX, hookdata->dataRef);
rpmhookUnregister(lua_tostring(L, 1), rpmluaHookWrapper, hookdata);
}
return 0;
}
static int rpm_call(lua_State *L)
{
if (!lua_isstring(L, 1)) {
(void) luaL_argerror(L, 1, "hook name expected");
} else {
rpmhookArgs args = rpmhookArgsNew(lua_gettop(L)-1);
const char *name = lua_tostring(L, 1);
char *argt = (char *)xmalloc(args->argc+1);
int i;
for (i = 0; i != args->argc; i++) {
switch (lua_type(L, i+1)) {
case LUA_TNIL:
argt[i] = 'p';
args->argv[i].p = NULL;
break;
case LUA_TNUMBER: {
float f = (float)lua_tonumber(L, i+1);
if (f == (int)f) {
argt[i] = 'i';
args->argv[i].i = (int)f;
} else {
argt[i] = 'f';
args->argv[i].f = f;
}
} break;
case LUA_TSTRING:
argt[i] = 's';
args->argv[i].s = lua_tostring(L, i+1);
break;
case LUA_TUSERDATA:
case LUA_TLIGHTUSERDATA:
argt[i] = 'p';
args->argv[i].p = lua_touserdata(L, i+1);
break;
default:
(void) luaL_error(L, "unsupported Lua type passed to hook");
argt[i] = 'p';
args->argv[i].p = NULL;
break;
}
}
args->argt = argt;
rpmhookCallArgs(name, args);
free(argt);
(void) rpmhookArgsFree(args);
}
return 0;
}
/* Based on luaB_print. */
static int rpm_print (lua_State *L)
{
rpmlua lua = (rpmlua)getdata(L, "lua");
int n = lua_gettop(L); /* number of arguments */
int i;
if (!lua) return 0;
lua_getglobal(L, "tostring");
for (i = 1; i <= n; i++) {
const char *s;
lua_pushvalue(L, -1); /* function to be called */
lua_pushvalue(L, i); /* value to print */
lua_call(L, 1, 1);
s = lua_tostring(L, -1); /* get result */
if (s == NULL)
return luaL_error(L, "`tostring' must return a string to `print'");
if (lua->storeprint) {
int sl = lua_strlen(L, -1);
if (lua->printbufused+sl+1 > lua->printbufsize) {
lua->printbufsize += sl+512;
lua->printbuf = xrealloc(lua->printbuf, lua->printbufsize);
}
if (i > 1)
lua->printbuf[lua->printbufused++] = '\t';
memcpy(lua->printbuf+lua->printbufused, s, sl+1);
lua->printbufused += sl;
} else {
if (i > 1)
(void) fputs("\t", stdout);
(void) fputs(s, stdout);
}
lua_pop(L, 1); /* pop result */
}
if (!lua->storeprint) {
(void) fputs("\n", stdout);
} else {
if (lua->printbufused+1 > lua->printbufsize) {
lua->printbufsize += 512;
lua->printbuf = xrealloc(lua->printbuf, lua->printbufsize);
}
lua->printbuf[lua->printbufused] = '\0';
}
return 0;
}
static const luaL_reg rpmlib[] = {
{"expand", rpm_expand},
{"define", rpm_define},
{"register", rpm_register},
{"unregister", rpm_unregister},
{"call", rpm_call},
{"interactive", rpm_interactive},
{NULL, NULL}
};
static int luaopen_rpm(lua_State *L)
{
lua_pushvalue(L, LUA_GLOBALSINDEX);
luaL_openlib(L, "rpm", rpmlib, 0);
return 0;
}
#endif /* WITH_LUA */
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