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BUG/MEDIUM: http-client: Don't wake http-client applet if nothing was xferred

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When data are transferred to or from the htt-pclient, the applet is
systematically woken up, even when no data are transferred. This could lead
to needlessly wakeups. When called from a lua script, if data are blocked
for a while, this leads to a wakeup ping-pong loop where the http-client
applet is woken up by the lua script which wakes back the script.

To fix the issue, in httpclient_req_xfer() and httpclient_res_xfer()
functions, we now take care to not wake the http-client applet up when no
data are transferred.

This patch must be backported as far as 2.6.
This commit is contained in:
Christopher Faulet 2025-07-08 07:46:26 +02:00
parent 479c9fb067
commit fffdac42df
1 changed files with 4 additions and 4 deletions
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8
src/http_client.c
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@ -179,10 +179,11 @@ int httpclient_res_xfer(struct httpclient *hc, struct buffer *dst)
int ret;
ret = b_force_xfer(dst, &hc->res.buf, MIN(room, b_data(&hc->res.buf)));
/* call the client once we consumed all data */
if (!b_data(&hc->res.buf)) {
b_free(&hc->res.buf);
if (hc->appctx)
if (ret && hc->appctx)
appctx_wakeup(hc->appctx);
}
return ret;
@ -211,11 +212,10 @@ int httpclient_req_xfer(struct httpclient *hc, struct ist src, int end)
if (!htx)
goto error;
if (hc->appctx)
appctx_wakeup(hc->appctx);
ret += htx_add_data(htx, src);
if (ret && hc->appctx)
appctx_wakeup(hc->appctx);
/* if we copied all the data and the end flag is set */
if ((istlen(src) == ret) && end) {