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MINOR: hlua: add an optional timeout to AppletTCP:receive()

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TCP services might want to be interactive, and without a timeout on
receive(), the possibilities are a bit limited. Let's add an optional
timeout in the 3rd argument to possibly limit the wait time. In this
case if the timeout strikes before the requested size is complete,
a possibly incomplete block will be returned.
This commit is contained in:
Willy Tarreau 2025-03-17 16:19:34 +01:00
parent 557f62593f
commit 19e48f237f
2 changed files with 34 additions and 8 deletions
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6
doc/lua-api/index.rst
View File

@ -3886,11 +3886,13 @@ AppletTCP class
:param class_AppletTCP applet: An :ref:`applettcp_class`
:returns: a string. The string can be empty if we reach the end of the stream.
.. js:function:: AppletTCP.receive(applet, [size])
.. js:function:: AppletTCP.receive(applet, [size, [timeout]])
Reads data from the TCP stream, according to the specified read *size*. If the
*size* is missing, the function tries to read all the content of the stream
until the end.
until the end. An optional timeout may be specified in milliseconds. In this
case the function will return no longer than this delay, with the amount of
available data (possibly none).
:param class_AppletTCP applet: An :ref:`applettcp_class`
:param integer size: the required read size.

36
src/hlua.c
View File

@ -5321,6 +5321,7 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
struct hlua_appctx *luactx = MAY_LJMP(hlua_checkapplet_tcp(L, 1));
struct stconn *sc = appctx_sc(luactx->appctx);
size_t len = MAY_LJMP(luaL_checkinteger(L, 2));
int exp_date = MAY_LJMP(luaL_checkinteger(L, -1));
int ret;
const char *blk1;
size_t len1;
@ -5335,8 +5336,14 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
/* Data not yet available. return yield. */
if (ret == 0) {
if (tick_is_expired(exp_date, now_ms)) {
/* return the result. */
luaL_pushresult(&luactx->b);
return 1;
}
applet_need_more_data(luactx->appctx);
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, exp_date, 0));
}
/* End of data: commit the total strings and return. */
@ -5361,8 +5368,15 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
b_del(&luactx->appctx->inbuf, len1 + len2);
else
co_skip(sc_oc(sc), len1 + len2);
if (tick_is_expired(exp_date, now_ms)) {
/* return the result. */
luaL_pushresult(&luactx->b);
return 1;
}
applet_need_more_data(luactx->appctx);
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, exp_date, 0));
} else {
@ -5384,11 +5398,11 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
co_skip(sc_oc(sc), len1 + len2);
/* If there is no other data available, yield waiting for new data. */
if (len > 0) {
if (len > 0 && !tick_is_expired(exp_date, now_ms)) {
lua_pushinteger(L, len);
lua_replace(L, 2);
applet_need_more_data(luactx->appctx);
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, exp_date, 0));
}
/* return the result. */
@ -5406,11 +5420,17 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
__LJMP static int hlua_applet_tcp_recv(lua_State *L)
{
struct hlua_appctx *luactx = MAY_LJMP(hlua_checkapplet_tcp(L, 1));
int exp_date;
int delay = 0;
int len = -1;
if (lua_gettop(L) > 2)
WILL_LJMP(luaL_error(L, "The 'recv' function requires between 1 and 2 arguments."));
if (lua_gettop(L) > 3)
WILL_LJMP(luaL_error(L, "The 'recv' function requires between 1 and 3 arguments."));
if (lua_gettop(L) >= 2) {
if (lua_gettop(L) >= 3) {
delay = MAY_LJMP(luaL_checkinteger(L, 3));
lua_pop(L, 1);
}
len = MAY_LJMP(luaL_checkinteger(L, 2));
lua_pop(L, 1);
}
@ -5418,6 +5438,10 @@ __LJMP static int hlua_applet_tcp_recv(lua_State *L)
/* Confirm or set the required length */
lua_pushinteger(L, len);
/* set the expiration date */
exp_date = delay ? tick_add(now_ms, delay) : TICK_ETERNITY;
lua_pushinteger(L, exp_date);
/* Initialise the string catenation. */
luaL_buffinit(L, &luactx->b);