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[core] tune http_response_process_headers() 

- rearrange some code for better CPU cache use
- use http_header_str_contains_token()
This commit is contained in:
Glenn Strauss 2021-07-12 14:55:54 -04:00
parent f4ff56e064
commit dbf7588147
1 changed files with 13 additions and 11 deletions
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24
src/http-header-glue.c
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@ -739,11 +739,6 @@ static int http_response_process_headers(request_st * const restrict r, http_res
const char *k = s+hoff[i], *value;
char *end = s+hoff[i+1]-1; /*('\n')*/
/* strip the \r?\n */
if (end > k && end[-1] == '\r') --end;
end[0] = '\0'; /* for http_header_str_to_code(), strstr() */
/*(XXX: not done; could remove trailing whitespace)*/
/* parse the headers */
if (NULL == (value = memchr(k, ':', end - k))) {
/* we expect: "<key>: <value>\r\n" */
@ -752,11 +747,16 @@ static int http_response_process_headers(request_st * const restrict r, http_res
const uint32_t klen = (uint32_t)(value - k);
if (0 == klen) continue; /*(already ignored when writing response)*/
do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */
const enum http_header_e id = http_header_hkey_get(k, klen);
do { ++value; } while (*value == ' ' || *value == '\t'); /* skip LWS */
/* strip the \r?\n */
if (end > value && end[-1] == '\r') --end;
/*(XXX: not done; could remove trailing whitespace)*/
if (opts->authorizer && (0 == r->http_status || 200 == r->http_status)){
if (id == HTTP_HEADER_STATUS) {
end[0] = '\0';
int status = http_header_str_to_code(value);
if (status >= 100 && status < 1000) {
r->http_status = status;
@ -777,6 +777,7 @@ static int http_response_process_headers(request_st * const restrict r, http_res
switch (id) {
case HTTP_HEADER_STATUS:
if (opts->backend != BACKEND_PROXY) {
end[0] = '\0';
int status = http_header_str_to_code(value);
if (status >= 100 && status < 1000) {
r->http_status = status;
@ -798,10 +799,10 @@ static int http_response_process_headers(request_st * const restrict r, http_res
break;
case HTTP_HEADER_CONNECTION:
if (opts->backend == BACKEND_PROXY) continue;
/*(should parse for tokens and do case-insensitive match for "close"
* but this is an imperfect though simplistic attempt to honor
* backend request to close)*/
if (NULL != strstr(value, "lose")) r->keep_alive = 0;
/*(simplistic attempt to honor backend request to close)*/
if (http_header_str_contains_token(value, end - value,
CONST_STR_LEN("close")))
r->keep_alive = 0;
if (r->http_version >= HTTP_VERSION_2) continue;
break;
case HTTP_HEADER_CONTENT_LENGTH:
@ -859,7 +860,8 @@ static int http_response_process_headers(request_st * const restrict r, http_res
break;
}
http_header_response_insert(r, id, k, klen, value, end - value);
if (end - value)
http_header_response_insert(r, id, k, klen, value, end - value);
}
/* CGI/1.1 rev 03 - 7.2.1.2 */