Function scriptingInit

src/scripting.cpp:1147–1323

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. */
void scriptingInit(int setup) {
    lua_State *lua = lua_open();

    if (setup) {
        for (int iel = 0; iel < cserver.cthreads; ++iel)
        {
            g_pserver->rgthreadvar[iel].lua_client = createClient(nullptr, iel);
            g_pserver->rgthreadvar[iel].lua_client->flags |= CLIENT_LUA;
            /* We do not want to allow blocking commands inside Lua */
            g_pserver->rgthreadvar[iel].lua_client->flags |= CLIENT_DENY_BLOCKING;
        }
        g_pserver->lua_timedout = 0;
        g_pserver->lua_caller = NULL;
        g_pserver->lua_cur_script = NULL;
        ldbInit();
    }

    luaLoadLibraries(lua);
    luaRemoveUnsupportedFunctions(lua);

    /* Initialize a dictionary we use to map SHAs to scripts.
     * This is useful for replication, as we need to replicate EVALSHA
     * as EVAL, so we need to remember the associated script. */
    g_pserver->lua_scripts = dictCreate(&shaScriptObjectDictType,NULL);
    g_pserver->lua_scripts_mem = 0;

    /* 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);

    /* redis.setresp */
    lua_pushstring(lua,"setresp");
    lua_pushcfunction(lua,luaSetResp);
    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");