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pulse-server: filter out redundant subscribe messages

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This commit is contained in:
Wim Taymans 2020-11-18 15:00:38 +01:00
parent 935851a6a6
commit 4cc466ad64
2 changed files with 32 additions and 1 deletions
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1
src/modules/module-protocol-pulse/message.c
View file

@ -117,6 +117,7 @@ enum {
struct message {
struct spa_list link;
uint32_t extra[4];
uint32_t channel;
uint32_t allocated;
uint32_t length;

32
src/modules/module-protocol-pulse/pulse-server.c
View file

@ -290,6 +290,7 @@ static struct message *message_alloc(struct client *client, uint32_t channel, ui
if (msg == NULL)
return NULL;
ensure_size(msg, size);
spa_zero(msg->extra);
msg->channel = channel;
msg->offset = 0;
msg->length = size;
@ -448,11 +449,40 @@ static int send_underflow(struct stream *stream, int64_t offset)
static int send_subscribe_event(struct client *client, uint32_t event, uint32_t id)
{
struct message *reply;
struct message *reply, *m, *t;
pw_log_debug(NAME" %p: SUBSCRIBE event:%08x id:%u", client, event, id);
if ((event & SUBSCRIPTION_EVENT_TYPE_MASK) != SUBSCRIPTION_EVENT_NEW) {
spa_list_for_each_safe_reverse(m, t, &client->out_messages, link) {
if (m->extra[0] != COMMAND_SUBSCRIBE_EVENT)
continue;
if ((m->extra[1] ^ event) & SUBSCRIPTION_EVENT_FACILITY_MASK)
continue;
if (m->extra[2] != id)
continue;
if ((event & SUBSCRIPTION_EVENT_TYPE_MASK) == SUBSCRIPTION_EVENT_REMOVE) {
/* This object is being removed, hence there is no
* point in keeping the old events regarding this
* entry in the queue. */
message_free(client, m, true, false);
pw_log_debug("Dropped redundant event due to remove event.");
continue;
}
if ((event & SUBSCRIPTION_EVENT_TYPE_MASK) == SUBSCRIPTION_EVENT_CHANGE) {
/* This object has changed. If a "new" or "change" event for
* this object is still in the queue we can exit. */
pw_log_debug("Dropped redundant event due to change event.");
return 0;
}
}
}
reply = message_alloc(client, -1, 0);
reply->extra[0] = COMMAND_SUBSCRIBE_EVENT,
reply->extra[1] = event,
reply->extra[2] = id,
message_put(reply,
TAG_U32, COMMAND_SUBSCRIBE_EVENT,
TAG_U32, -1,