RIOT-OS/RIOT
RIOT-OS/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2025-01-18 12:52:44 +01:00
Code Releases Activity

nanocoap_cache: add helper function to check if entry is stale

Browse Source
This commit is contained in:
Martine Lenders 2022-05-13 11:58:31 +02:00
parent e6a9443932
commit dbed2b48ea
No known key found for this signature in database
GPG Key ID: 2134D77A5336DD80
3 changed files with 23 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
sys/include/net/nanocoap/cache.h
View File

@ -23,6 +23,7 @@
#define NET_NANOCOAP_CACHE_H
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include "clist.h"
#include "net/nanocoap.h"
@ -89,7 +90,7 @@ typedef struct {
* @brief absolute system time in seconds until which this cache entry
* is considered valid.
*/
ztimer_now_t max_age;
uint32_t max_age;
} nanocoap_cache_entry_t;
/**
@ -230,6 +231,21 @@ void nanocoap_cache_key_generate(const coap_pkt_t *req, uint8_t *cache_key);
*/
ssize_t nanocoap_cache_key_compare(uint8_t *cache_key1, uint8_t *cache_key2);
/**
* @brief Check if the Max-Age of a cache entry has passed
*
* @param[in] ce A cache entry
* @param[in] now The current time
*
* @return true, if Max-Age of cache entry has passed.
* @return false, if Max-Age of cache entry has not yet passed.
*/
static inline bool nanocoap_cache_entry_is_stale(const nanocoap_cache_entry_t *ce, uint32_t now)
{
/* see https://en.wikipedia.org/w/index.php?title=Serial_number_arithmetic&oldid=1085516466#General_solution */
return ((int)(now - ce->max_age) > 0);
}
#ifdef __cplusplus
}
#endif

3
sys/net/application_layer/gcoap/gcoap.c
View File

@ -1253,8 +1253,7 @@ static bool _cache_lookup(gcoap_request_memo_t *memo,
/* cache hit, methods are equal, and cache entry is not stale */
if (*ce &&
((*ce)->request_method == coap_get_code(pdu)) &&
/* if now < (*ce)->max_age we have an overflow => result large as (*ce)->max_age */
((unsigned)(now - (*ce)->max_age) > (*ce)->max_age)) {
!nanocoap_cache_entry_is_stale(*ce, now)) {
return true;
}
}

7
tests/unittests/tests-nanocoap_cache/tests-nanocoap_cache.c
View File

@ -231,7 +231,7 @@ static void test_nanocoap_cache__max_age(void)
/* the absolute time of max-age should be at approx. now + 30 sec
(1 sec buffer) */
now = ztimer_now(ZTIMER_SEC);
TEST_ASSERT(c->max_age < (now + 31));
TEST_ASSERT(nanocoap_cache_entry_is_stale(c, now + 31));
/* delete previously added cache entry */
nanocoap_cache_del(c);
@ -251,7 +251,10 @@ static void test_nanocoap_cache__max_age(void)
/* the absolute time of max-age should be at approx. now + 60 sec
(1 sec buffer) */
now = ztimer_now(ZTIMER_SEC);
TEST_ASSERT(c->max_age < (now + 61));
TEST_ASSERT(nanocoap_cache_entry_is_stale(c, now + 61));
/* check overflow cases */
c->max_age = UINT32_MAX - 40;
TEST_ASSERT(nanocoap_cache_entry_is_stale(c, 20));
}
Test *tests_nanocoap_cache_tests(void)