Method initLua

src/tendisplus/script/lua_state.cpp:714–850

Initialize the scripting environment. * * This function is called the first time at server startup with * the 'setup' argument set to 1. * * It can be called again multiple times during the lifetime of the Redis * process, with 'setup' set to 0, and following a scriptingRelease() call, * in order to reset the Lua scripting environment. * * However it is simpler to just call scriptingReset

 *
 * However it is simpler to just call scriptingReset() that does just that. */
lua_State* LuaState::initLua(int setup) {
  lua_State* lua = lua_open();

  if (setup) {
    _sess = nullptr;
    _fakeSess = nullptr;
    lua_timedout = 0;
  }

  luaLoadLibraries(lua);
  luaRemoveUnsupportedFunctions(lua);

  /* NOTE(takenliu): dont support lua_scripts dictionary*/

  /* Register the redis commands table and fields */
  lua_newtable(lua);

  /* redis.call */
  lua_pushstring(lua, "call");
  lua_pushcfunction(lua, luaRedisCallCommand);
  lua_settable(lua, -3);

  /* redis.pcall */
  lua_pushstring(lua, "pcall");
  lua_pushcfunction(lua, luaRedisPCallCommand);
  lua_settable(lua, -3);

  /* redis.log and log levels. */
  lua_pushstring(lua, "log");
  lua_pushcfunction(lua, luaLogCommand);
  lua_settable(lua, -3);

  lua_pushstring(lua, "LOG_DEBUG");
  lua_pushnumber(lua, LL_DEBUG);
  lua_settable(lua, -3);

  lua_pushstring(lua, "LOG_VERBOSE");
  lua_pushnumber(lua, LL_VERBOSE);
  lua_settable(lua, -3);

  lua_pushstring(lua, "LOG_NOTICE");
  lua_pushnumber(lua, LL_NOTICE);
  lua_settable(lua, -3);

  lua_pushstring(lua, "LOG_WARNING");
  lua_pushnumber(lua, LL_WARNING);
  lua_settable(lua, -3);

  /* redis.sha1hex */
  lua_pushstring(lua, "sha1hex");
  lua_pushcfunction(lua, luaRedisSha1hexCommand);
  lua_settable(lua, -3);

  /* redis.error_reply and redis.status_reply */
  lua_pushstring(lua, "error_reply");
  lua_pushcfunction(lua, luaRedisErrorReplyCommand);
  lua_settable(lua, -3);
  lua_pushstring(lua, "status_reply");