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HTTP parser: reduced memory consumption of header fields list.

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This commit is contained in:
Valentin Bartenev
2017-06-20 22:32:13 +03:00
parent 1a22195830
commit accb489492
4 changed files with 164 additions and 158 deletions
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136
src/nxt_http_parse.c
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@@ -8,20 +8,21 @@
typedef struct {
nxt_http_fields_hash_entry_t *entry;
nxt_http_field_handler_t handler;
uintptr_t data;
union {
uint8_t str[8];
uint64_t ui64;
uint8_t str[8];
uint64_t ui64;
} key[];
} nxt_http_fields_hash_elt_t;
struct nxt_http_fields_hash_s {
size_t min_length;
size_t max_length;
void *long_fields;
nxt_http_fields_hash_elt_t *elts[];
size_t min_length;
size_t max_length;
void *long_fields;
nxt_http_fields_hash_elt_t *elts[];
};
@@ -43,9 +44,10 @@ static u_char *nxt_http_lookup_field_end(u_char *p, u_char *end);
static nxt_int_t nxt_http_parse_field_end(nxt_http_request_parse_t *rp,
u_char **pos, u_char *end);
static nxt_http_fields_hash_entry_t *nxt_http_fields_hash_lookup_long(
nxt_http_fields_hash_t *hash, nxt_http_field_t *field);
static void nxt_http_fields_hash_lookup(nxt_http_fields_hash_t *hash,
uint64_t key[4], nxt_http_field_t *field);
static void nxt_http_fields_hash_lookup_long(nxt_http_fields_hash_t *hash,
nxt_http_field_t *field);
typedef enum {
@@ -426,7 +428,7 @@ nxt_http_parse_field_name(nxt_http_request_parse_t *rp, u_char **pos,
p = *pos;
size = end - p;
i = rp->field.name.length;
i = rp->field_name.length;
#define nxt_http_parse_field_name_step \
{ \
@@ -437,7 +439,7 @@ nxt_http_parse_field_name(nxt_http_request_parse_t *rp, u_char **pos,
goto name_end; \
} \
\
rp->field.key.str[i % 32] = c; \
rp->field_key.str[i % 32] = c; \
i++; \
}
@@ -459,7 +461,7 @@ nxt_http_parse_field_name(nxt_http_request_parse_t *rp, u_char **pos,
#undef nxt_http_parse_field_name_step
rp->field.name.length = i;
rp->field_name.length = i;
rp->handler = &nxt_http_parse_field_name;
return NXT_AGAIN;
@@ -473,8 +475,8 @@ name_end:
*pos = &p[i] + 1;
rp->field.name.length = i;
rp->field.name.start = p;
rp->field_name.length = i;
rp->field_name.start = p;
return nxt_http_parse_field_value(rp, pos, end);
}
@@ -511,13 +513,13 @@ nxt_http_parse_field_value(nxt_http_request_parse_t *rp, u_char **pos,
*pos = p;
p += rp->field.value.length;
p += rp->field_value.length;
for ( ;; ) {
p = nxt_http_lookup_field_end(p, end);
if (nxt_slow_path(p == end)) {
rp->field.value.length = p - *pos;
rp->field_value.length = p - *pos;
rp->handler = &nxt_http_parse_field_value;
return NXT_AGAIN;
}
@@ -539,8 +541,8 @@ nxt_http_parse_field_value(nxt_http_request_parse_t *rp, u_char **pos,
}
}
rp->field.value.length = p - *pos;
rp->field.value.start = *pos;
rp->field_value.length = p - *pos;
rp->field_value.start = *pos;
*pos = p;
@@ -634,16 +636,23 @@ nxt_http_parse_field_end(nxt_http_request_parse_t *rp, u_char **pos,
if (nxt_fast_path(*p == '\n')) {
*pos = p + 1;
if (rp->field.name.length != 0) {
if (rp->field_name.length != 0) {
field = nxt_list_add(rp->fields);
if (nxt_slow_path(field == NULL)) {
return NXT_ERROR;
}
*field = rp->field;
field->name = rp->field_name;
field->value = rp->field_value;
nxt_memzero(&rp->field, sizeof(nxt_http_field_t));
nxt_http_fields_hash_lookup(rp->fields_hash, rp->field_key.ui64,
field);
nxt_memzero(rp->field_key.str, 32);
rp->field_name.length = 0;
rp->field_value.length = 0;
rp->handler = &nxt_http_parse_field_name;
return NXT_OK;
@@ -726,7 +735,8 @@ nxt_http_fields_hash_create(nxt_http_fields_hash_entry_t *entries,
continue;
}
elt->entry = &entries[j];
elt->handler = entries[j].handler;
elt->data = entries[j].data;
nxt_memcpy_lowcase(elt->key->str, entries[j].name.start, length);
@@ -744,86 +754,87 @@ nxt_http_fields_hash_create(nxt_http_fields_hash_entry_t *entries,
}
nxt_http_fields_hash_entry_t *
nxt_http_fields_hash_lookup(nxt_http_fields_hash_t *hash,
static void
nxt_http_fields_hash_lookup(nxt_http_fields_hash_t *hash, uint64_t key[4],
nxt_http_field_t *field)
{
nxt_http_fields_hash_elt_t *elt;
if (field->name.length < hash->min_length) {
return NULL;
if (hash == NULL || field->name.length < hash->min_length) {
goto not_found;
}
if (field->name.length > hash->max_length) {
if (field->name.length > 32 && hash->long_fields != NULL) {
return nxt_http_fields_hash_lookup_long(hash, field);
nxt_http_fields_hash_lookup_long(hash, field);
return;
}
return NULL;
goto not_found;
}
elt = hash->elts[field->name.length - hash->min_length];
if (elt == NULL) {
return NULL;
goto not_found;
}
switch ((field->name.length + 7) / 8) {
case 1:
do {
if (elt->key[0].ui64 == field->key.ui64[0]) {
return elt->entry;
if (elt->key[0].ui64 == key[0]) {
break;
}
elt = nxt_http_fields_hash_next_elt(elt, 1);
} while (elt->entry != NULL);
} while (elt->handler != NULL);
break;
case 2:
do {
if (elt->key[0].ui64 == field->key.ui64[0]
&& elt->key[1].ui64 == field->key.ui64[1])
if (elt->key[0].ui64 == key[0]
&& elt->key[1].ui64 == key[1])
{
return elt->entry;
break;
}
elt = nxt_http_fields_hash_next_elt(elt, 2);
} while (elt->entry != NULL);
} while (elt->handler != NULL);
break;
case 3:
do {
if (elt->key[0].ui64 == field->key.ui64[0]
&& elt->key[1].ui64 == field->key.ui64[1]
&& elt->key[2].ui64 == field->key.ui64[2])
if (elt->key[0].ui64 == key[0]
&& elt->key[1].ui64 == key[1]
&& elt->key[2].ui64 == key[2])
{
return elt->entry;
break;
}
elt = nxt_http_fields_hash_next_elt(elt, 3);
} while (elt->entry != NULL);
} while (elt->handler != NULL);
break;
case 4:
do {
if (elt->key[0].ui64 == field->key.ui64[0]
&& elt->key[1].ui64 == field->key.ui64[1]
&& elt->key[2].ui64 == field->key.ui64[2]
&& elt->key[3].ui64 == field->key.ui64[3])
if (elt->key[0].ui64 == key[0]
&& elt->key[1].ui64 == key[1]
&& elt->key[2].ui64 == key[2]
&& elt->key[3].ui64 == key[3])
{
return elt->entry;
break;
}
elt = nxt_http_fields_hash_next_elt(elt, 4);
} while (elt->entry != NULL);
} while (elt->handler != NULL);
break;
@@ -831,32 +842,39 @@ nxt_http_fields_hash_lookup(nxt_http_fields_hash_t *hash,
nxt_unreachable();
}
return NULL;
field->handler = elt->handler;
field->data = elt->data;
return;
not_found:
field->handler = NULL;
field->data = 0;
}
static nxt_http_fields_hash_entry_t *
static void
nxt_http_fields_hash_lookup_long(nxt_http_fields_hash_t *hash,
nxt_http_field_t *field)
{
/* TODO */
return NULL;
field->handler = NULL;
field->data = 0;
}
nxt_int_t
nxt_http_fields_process(nxt_list_t *fields, nxt_http_fields_hash_t *hash,
void *ctx, nxt_log_t *log)
nxt_http_fields_process(nxt_list_t *fields, void *ctx, nxt_log_t *log)
{
nxt_int_t rc;
nxt_http_field_t *field;
nxt_http_fields_hash_entry_t *entry;
nxt_int_t rc;
nxt_http_field_t *field;
nxt_list_each(field, fields) {
entry = nxt_http_fields_hash_lookup(hash, field);
if (entry != NULL) {
rc = entry->handler(ctx, field, entry->data, log);
if (field->handler != NULL) {
rc = field->handler(ctx, field, log);
if (rc != NXT_OK) {
return rc;