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Make HTTP message parsing a little faster

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ParseHttpMessage() now does a better job avoiding malloc() calls and
headers commonly sent by CloudFlare can now be consulted in constant
time using our hard-coded perfect hash table.  This increases /claim
performance from 321k to 337k qps which is 5% faster.
This commit is contained in:
Justine Tunney 2022-10-04 06:33:10 -07:00
parent 726f04e8aa
commit 9f9b240f3d
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GPG key ID: BE714B4575D6E328
5 changed files with 209 additions and 166 deletions
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32
net/http/parsehttpmessage.c
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@ -16,12 +16,12 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/alg.h"
#include "libc/mem/arraylist.internal.h"
#include "libc/assert.h"
#include "libc/intrin/bits.h"
#include "libc/limits.h"
#include "libc/macros.internal.h"
#include "libc/mem/alg.h"
#include "libc/mem/arraylist.internal.h"
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
@ -86,7 +86,6 @@ void DestroyHttpMessage(struct HttpMessage *r) {
*/
int ParseHttpMessage(struct HttpMessage *r, const char *p, size_t n) {
int c, h, i;
struct HttpHeader *x;
for (n = MIN(n, LIMIT); r->i < n; ++r->i) {
c = p[r->i] & 0xff;
switch (r->t) {
@ -232,14 +231,25 @@ int ParseHttpMessage(struct HttpMessage *r, const char *p, size_t n) {
(!r->headers[h].a || !kHttpRepeatable[h])) {
r->headers[h].a = r->a;
r->headers[h].b = i;
} else if ((x = realloc(
r->xheaders.p,
(r->xheaders.n + 1) * sizeof(*r->xheaders.p)))) {
x[r->xheaders.n].k = r->k;
x[r->xheaders.n].v.a = r->a;
x[r->xheaders.n].v.b = i;
r->xheaders.p = x;
++r->xheaders.n;
} else {
if (r->xheaders.n == r->xheaders.c) {
unsigned c2;
struct HttpHeader *p1, *p2;
p1 = r->xheaders.p;
c2 = r->xheaders.c + 2;
c2 = c2 >> 1;
if ((p2 = realloc(p1, c2 * sizeof(*p1)))) {
r->xheaders.p = p2;
r->xheaders.c = c2;
}
}
if (r->xheaders.n < r->xheaders.c) {
r->xheaders.p[r->xheaders.n].k = r->k;
r->xheaders.p[r->xheaders.n].v.a = r->a;
r->xheaders.p[r->xheaders.n].v.b = i;
r->xheaders.p = r->xheaders.p;
++r->xheaders.n;
}
}
r->t = c == '\r' ? kHttpStateCr : kHttpStateLf1;
break;