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core: follow up to r1710095, r1710105.

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We can do this in a single (no inner) loop, and simplify again the logic.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1711902 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yann Ylavic
2015-11-02 08:08:25 +00:00
parent e0bdcf64a5
commit 1612dc929b
1 changed files with 77 additions and 74 deletions
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151
modules/http/http_request.c
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@@ -230,91 +230,94 @@ AP_DECLARE(void) ap_die(int type, request_rec *r)
static void check_pipeline(conn_rec *c, apr_bucket_brigade *bb)
{
apr_status_t rv;
int num_blank_lines = DEFAULT_LIMIT_BLANK_LINES;
ap_input_mode_t mode = AP_MODE_SPECULATIVE;
apr_size_t cr = 0;
char buf[2];
c->data_in_input_filters = 0;
if (c->keepalive != AP_CONN_CLOSE && !c->aborted) {
apr_status_t rv;
int num_blank_lines = DEFAULT_LIMIT_BLANK_LINES;
ap_input_mode_t mode = AP_MODE_SPECULATIVE;
apr_size_t len, cr = 0;
char buf[2];
while (c->keepalive != AP_CONN_CLOSE && !c->aborted) {
apr_size_t len = cr + 1;
do {
apr_brigade_cleanup(bb);
rv = ap_get_brigade(c->input_filters, bb, mode,
APR_NONBLOCK_READ, cr + 1);
if (rv != APR_SUCCESS || APR_BRIGADE_EMPTY(bb)) {
/*
* Error or empty brigade: There is no data present in the input
* filter
*/
if (mode == AP_MODE_READBYTES) {
/* Unexpected error, stop with this connection */
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(02967)
"Can't consume pipelined empty lines");
c->keepalive = AP_CONN_CLOSE;
}
return;
}
/* Ignore trailing blank lines (which must not be interpreted as
* pipelined requests) up to the limit, otherwise we would block
* on the next read without flushing data, and hence possibly delay
* pending response(s) until the next/real request comes in or the
* keepalive timeout expires.
apr_brigade_cleanup(bb);
rv = ap_get_brigade(c->input_filters, bb, mode,
APR_NONBLOCK_READ, len);
if (rv != APR_SUCCESS || APR_BRIGADE_EMPTY(bb)) {
/*
* Error or empty brigade: There is no data present in the input
* filter
*/
len = cr + 1;
rv = apr_brigade_flatten(bb, buf, &len);
if (rv != APR_SUCCESS || len != cr + 1) {
int level;
if (mode == AP_MODE_READBYTES) {
/* Unexpected error, stop with this connection */
c->keepalive = AP_CONN_CLOSE;
level = APLOG_ERR;
}
else {
/* Let outside (non-speculative/blocking) read determine
* where this possible failure comes from (metadata,
* morphed EOF socket => empty bucket? debug only here).
*/
c->data_in_input_filters = 1;
level = APLOG_DEBUG;
}
ap_log_cerror(APLOG_MARK, level, rv, c, APLOGNO(02968)
"Can't check pipelined data");
return;
}
if (mode == AP_MODE_READBYTES) {
mode = AP_MODE_SPECULATIVE;
cr = 0;
continue;
/* Unexpected error, stop with this connection */
ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(02967)
"Can't consume pipelined empty lines");
c->keepalive = AP_CONN_CLOSE;
}
break;
}
if (cr) {
AP_DEBUG_ASSERT(len == 2 && buf[0] == APR_ASCII_CR);
if (buf[1] != APR_ASCII_LF) {
return;
}
/* Ignore trailing blank lines (which must not be interpreted as
* pipelined requests) up to the limit, otherwise we would block
* on the next read without flushing data, and hence possibly delay
* pending response(s) until the next/real request comes in or the
* keepalive timeout expires.
*/
rv = apr_brigade_flatten(bb, buf, &len);
if (rv != APR_SUCCESS || len != cr + 1) {
int log_level;
if (mode == AP_MODE_READBYTES) {
/* Unexpected error, stop with this connection */
c->keepalive = AP_CONN_CLOSE;
log_level = APLOG_ERR;
}
else {
/* Let outside (non-speculative/blocking) read determine
* where this possible failure comes from (metadata,
* morphed EOF socket => empty bucket? debug only here).
*/
c->data_in_input_filters = 1;
log_level = APLOG_DEBUG;
}
ap_log_cerror(APLOG_MARK, log_level, rv, c, APLOGNO(02968)
"Can't check pipelined data");
break;
}
if (mode == AP_MODE_READBYTES) {
mode = AP_MODE_SPECULATIVE;
cr = 0;
}
else if (cr) {
AP_DEBUG_ASSERT(len == 2 && buf[0] == APR_ASCII_CR);
if (buf[1] == APR_ASCII_LF) {
mode = AP_MODE_READBYTES;
num_blank_lines--;
}
else {
if (buf[0] == APR_ASCII_CR) {
cr = 1;
}
else if (buf[0] == APR_ASCII_LF) {
mode = AP_MODE_READBYTES;
num_blank_lines--;
}
else {
c->data_in_input_filters = 1;
return;
}
c->data_in_input_filters = 1;
break;
}
} while (num_blank_lines >= 0);
/* Don't recycle this (abused) connection */
c->keepalive = AP_CONN_CLOSE;
}
else {
if (buf[0] == APR_ASCII_LF) {
mode = AP_MODE_READBYTES;
num_blank_lines--;
}
else if (buf[0] == APR_ASCII_CR) {
cr = 1;
}
else {
c->data_in_input_filters = 1;
break;
}
}
/* Enough blank lines with this connection?
* Stop and don't recycle it.
*/
if (num_blank_lines < 0) {
c->keepalive = AP_CONN_CLOSE;
}
}
}