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feat(mdns): check if the txt items is changed when browsing

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Xu Si Yu
2024-07-12 19:52:19 +08:00
parent 906e447193
commit e2f0477a00
1 changed files with 33 additions and 4 deletions
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37
components/mdns/mdns.c
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@ -7521,6 +7521,21 @@ static mdns_browse_t *_mdns_browse_find_from(mdns_browse_t *b, mdns_name_t *name
return b;
}
static bool is_txt_item_in_list(mdns_txt_item_t txt, uint8_t txt_value_len, mdns_txt_item_t *txt_list, uint8_t *txt_value_len_list, size_t txt_count)
{
for (size_t i = 0; i < txt_count; i++) {
if (strcmp(txt.key, txt_list[i].key) == 0) {
if (txt_value_len == txt_value_len_list[i] && memcmp(txt.value, txt_list[i].value, txt_value_len) == 0) {
return true;
} else {
// The key value is unique, so there is no need to continue searching.
return false;
}
}
}
return false;
}
/**
* @brief Called from parser to add TXT data to search result
*/
@ -7541,9 +7556,20 @@ static void _mdns_browse_result_add_txt(mdns_browse_t *browse, const char *insta
!_str_null_or_empty(r->instance_name) && !strcasecmp(instance, r->instance_name) &&
!_str_null_or_empty(r->service_type) && !strcasecmp(service, r->service_type) &&
!_str_null_or_empty(r->proto) && !strcasecmp(proto, r->proto)) {
bool should_update = false;
if (r->txt) {
// Check if txt changed
if (txt_count != r->txt_count) {
should_update = true;
} else {
for (size_t txt_index = 0; txt_index < txt_count; txt_index++) {
if (!is_txt_item_in_list(txt[txt_index], txt_value_len[txt_index], r->txt, r->txt_value_len, r->txt_count)) {
should_update = true;
break;
}
}
}
// If the result has a previous txt entry, we delete it and re-add.
// TODO: we need to check if txt changes.
for (size_t i = 0; i < r->txt_count; i++) {
free((char *)(r->txt[i].key));
free((char *)(r->txt[i].value));
@ -7562,9 +7588,12 @@ static void _mdns_browse_result_add_txt(mdns_browse_t *browse, const char *insta
_mdns_result_update_ttl(r, ttl);
}
if (previous_ttl != r->ttl) {
if (_mdns_add_browse_result(out_sync_browse, r) != ESP_OK) {
return;
}
should_update = true;
}
}
if (should_update) {
if (_mdns_add_browse_result(out_sync_browse, r) != ESP_OK) {
return;
}
}
return;