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async dns: add dump helper when _DEBUG

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This commit is contained in:
Andy Green 2021-02-02 13:47:30 +00:00
parent 79c02baa9e
commit a6d81e3fcc
2 changed files with 67 additions and 8 deletions
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68
lib/system/async-dns/async-dns.c
View file

@ -113,6 +113,8 @@ lws_async_dns_complete(lws_adns_q_t *q, lws_adns_cache_t *c)
c ? c->results : NULL, 0, q->opaque);
}
lws_adns_dump(q->dns);
return 0;
}
@ -121,6 +123,9 @@ lws_async_dns_sul_cb_retry(struct lws_sorted_usec_list *sul)
{
lws_adns_q_t *q = lws_container_of(sul, lws_adns_q_t, sul);
lwsl_info("%s\n", __func__);
lws_adns_dump(q->dns);
lws_callback_on_writable(q->dns->wsi);
}
@ -250,8 +255,11 @@ qfail:
* evidently the second response didn't come in time, purge the
* incomplete cache entry
*/
if (q->firstcache)
if (q->firstcache) {
lwsl_notice("%s: destroy firstcache\n", __func__);
lws_adns_cache_destroy(q->firstcache);
q->firstcache = NULL;
}
lws_async_dns_complete(q, NULL);
lws_adns_q_destroy(q);
}
@ -381,6 +389,41 @@ lws_adns_get_cache(lws_async_dns_t *dns, const char *name)
return NULL;
}
#if defined(_DEBUG)
void
lws_adns_dump(lws_async_dns_t *dns)
{
lws_adns_cache_t *c;
const char *cn;
if (!dns)
return;
lwsl_info("%s: ADNS cache %u entries\n", __func__,
(unsigned int)dns->cached.count);
lws_start_foreach_dll(struct lws_dll2 *, d,
lws_dll2_get_head(&dns->cached)) {
c = lws_container_of(d, lws_adns_cache_t, list);
cn = lws_adns_cache_to_name(c);
lwsl_info("%s: cache: '%s', exp: %lldus, incomp %d, "
"fl 0x%x, refc %d, res %p\n", __func__, cn,
(long long)(c->sul.us - lws_now_usecs()),
c->incomplete, c->flags, c->refcount, c->results);
} lws_end_foreach_dll(d);
lws_start_foreach_dll(struct lws_dll2 *, d,
lws_dll2_get_head(&dns->waiting)) {
lws_adns_q_t *q = lws_container_of(d, lws_adns_q_t, list);
lwsl_info("%s: q: '%s', sent %d, resp %d\n",
__func__, (const char *)&q[1], q->sent[0],
q->responded);
} lws_end_foreach_dll(d);
}
#endif
void
lws_adns_cache_destroy(lws_adns_cache_t *c)
{
@ -412,8 +455,6 @@ sul_cb_write(struct lws_sorted_usec_list *sul)
{
lws_adns_q_t *q = lws_container_of(sul, lws_adns_q_t, write_sul);
lwsl_info("%s\n", __func__);
/*
* Something's up, we couldn't even get from write request to
* WRITEABLE within the timeout, let alone the result... fail
@ -421,7 +462,9 @@ sul_cb_write(struct lws_sorted_usec_list *sul)
*/
lwsl_info("%s: failing\n", __func__);
lws_async_dns_complete(q, NULL);
lws_adns_dump(q->dns);
lws_async_dns_complete(q, NULL); /* no cache to relate to */
lws_adns_q_destroy(q);
}
@ -578,6 +621,9 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
char *p;
int m;
lwsl_info("%s: entry %s\n", __func__, name);
lws_adns_dump(dns);
#if !defined(LWS_WITH_IPV6)
if (qtype == LWS_ADNS_RECORD_AAAA) {
lwsl_err("%s: ipv6 not enabled\n", __func__);
@ -614,7 +660,7 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
c = lws_adns_get_cache(dns, name);
if (c) {
lwsl_info("%s: using cached, c->results %p\n", __func__, c->results);
lwsl_info("%s: %s: using cached, c->results %p\n", __func__, name, c->results);
m = c->results ? LADNS_RET_FOUND : LADNS_RET_FAILED;
if (c->results)
c->refcount++;
@ -622,7 +668,8 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
return LADNS_RET_FAILED_WSI_CLOSED;
return m;
}
} else
lwsl_notice("%s: %s uncached\n", __func__, name);
/*
* It's a 1.2.3.4 or ::1 type IP address already? We don't need a dns
@ -666,6 +713,8 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
lws_dll2_add_head(&c->list, &dns->cached);
lws_sul_schedule(context, 0, &c->sul, sul_cb_expire,
3600ll * LWS_US_PER_SEC);
lws_adns_dump(dns);
}
if (m == 4) {
@ -747,8 +796,10 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
q->qtype = (uint16_t)qtype;
if (lws_async_dns_get_new_tid(context, q))
if (lws_async_dns_get_new_tid(context, q)) {
lwsl_err("%s: tid fail\n", __func__);
goto failed;
}
q->tid &= 0xfffe;
q->context = context;
@ -785,7 +836,8 @@ lws_async_dns_query(struct lws_context *context, int tsi, const char *name,
lws_dll2_add_head(&q->list, &dns->waiting);
lwsl_info("%s: created new query\n", __func__);
lwsl_info("%s: created new query: %s\n", __func__, name);
lws_adns_dump(dns);
return LADNS_RET_CONTINUING;

7
lib/system/async-dns/private-lib-async-dns.h
View file

@ -128,3 +128,10 @@ lws_async_dns_trim_cache(lws_async_dns_t *dns);
int
lws_async_dns_get_new_tid(struct lws_context *context, lws_adns_q_t *q);
#if defined(_DEBUG)
void
lws_adns_dump(lws_async_dns_t *dns);
#else
#define lws_adns_dump(_d)
#endif