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MINOR: h3: do not consider missing buf room as error on trailers

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Improve h3_resp_trailers_send() return value to be similar with
h3_resp_data_send(). In particular, if QCS Tx buffer has not enough
space for trailer encoding, 0 is returned instead of an error value,
with QC_SF_BLK_MROOM set.

This unify HTTP/3 headers/data/trailers encoding functions. Negative
error codes are limited to fatal error which should cause a connection
closure. Not enough output buffer space is only a transient condition
which is reflect by the QC_SF_BLK_MROOM flag.
This commit is contained in:
Amaury Denoyelle 2024-01-04 12:01:24 +01:00
parent 14673fe54d
commit 8df47442d2
1 changed files with 34 additions and 21 deletions
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41
src/h3.c
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@ -1631,7 +1631,8 @@ static int h3_resp_headers_send(struct qcs *qcs, struct htx *htx)
* Caller is responsible to emit an empty QUIC STREAM frame to signal the end
* of the stream.
*
* Returns the size of HTX blocks removed.
* Returns the size of HTX blocks removed. A negative error code is returned in
* case of a fatal error which should caused a connection closure.
*/
static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
{
@ -1680,8 +1681,19 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
* frame. Mux will send an empty QUIC STREAM frame with FIN.
*/
TRACE_DATA("skipping trailer", H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
/* Truncate UNUSED / EOT HTX blocks. */
blk = htx_get_head_blk(htx);
while (blk) {
type = htx_get_blk_type(blk);
ret += htx_get_blksz(blk);
blk = htx_remove_blk(htx, blk);
if (type == HTX_BLK_EOT)
break;
}
goto end;
}
list[hdr].n = ist("");
if (!(res = qcc_get_stream_txbuf(qcs))) {
@ -1692,8 +1704,9 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
/* At least 9 bytes to store frame type + length as a varint max size */
if (b_room(res) < 9) {
TRACE_STATE("not enough room for trailers frame", H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
qcs->flags |= QC_SF_BLK_MROOM;
goto err;
goto end;
}
/* Force buffer realignment as size required to encode headers is unknown. */
@ -1703,8 +1716,9 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
headers_buf = b_make(b_peek(res, b_data(res) + 9), b_contig_space(res) - 9, 0, 0);
if (qpack_encode_field_section_line(&headers_buf)) {
TRACE_STATE("not enough room for trailers section line", H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
qcs->flags |= QC_SF_BLK_MROOM;
goto err;
goto end;
}
tail = b_tail(&headers_buf);
@ -1724,8 +1738,9 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
}
if (qpack_encode_header(&headers_buf, list[hdr].n, list[hdr].v)) {
TRACE_STATE("not enough room for all trailers", H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
qcs->flags |= QC_SF_BLK_MROOM;
goto err;
goto end;
}
}
@ -1735,11 +1750,10 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
* frame. Mux will send an empty QUIC STREAM frame with FIN.
*/
TRACE_DATA("skipping trailer", H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
goto end;
}
/* Now that all headers are encoded, we are certain that res buffer is
* big enough.
else {
/* Now that all headers are encoded, we are certain that res
* buffer is big enough.
*/
TRACE_DATA("encoding TRAILERS frame", H3_EV_TX_FRAME|H3_EV_TX_HDR,
qcs->qcc->conn, qcs);
@ -1747,9 +1761,9 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
if (!b_quic_enc_int(res, b_data(&headers_buf), 8))
ABORT_NOW();
b_add(res, b_data(&headers_buf));
}
end:
ret = 0;
/* Encoding success, truncate HTX blocks until EOT. */
blk = htx_get_head_blk(htx);
while (blk) {
type = htx_get_blk_type(blk);
@ -1759,6 +1773,7 @@ static int h3_resp_trailers_send(struct qcs *qcs, struct htx *htx)
break;
}
end:
TRACE_LEAVE(H3_EV_TX_FRAME|H3_EV_TX_HDR, qcs->qcc->conn, qcs);
return ret;
@ -1962,10 +1977,8 @@ static size_t h3_snd_buf(struct qcs *qcs, struct buffer *buf, size_t count)
break;
}
/* If an error occurred, either buffer space or connection error
* must be set to break current loop.
*/
BUG_ON(ret < 0 && !(qcs->flags & QC_SF_BLK_MROOM) && !h3c->err);
/* If an error occured, connection error must be set to break from the current loop. */
BUG_ON(ret < 0 && !h3c->err);
}
/* Interrupt sending on connection error. */