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authorJeremy Allison <jra@samba.org>2003-02-05 23:03:47 +0000
committerJeremy Allison <jra@samba.org>2003-02-05 23:03:47 +0000
commit68fdf96637b4f0b5ea3769988b1b865a14ef9fad (patch)
tree480cfb44f428d11a0b6af9cecc20968794c6296d /source3/printing
parent56060dcf9eef28a8506ddf9828f1501e1bf48801 (diff)
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Collapse duplicate messages before sending.
Jeremy. (This used to be commit 203959f1c2389fa95736af09fee5b07e7ae8b659)
Diffstat (limited to 'source3/printing')
-rw-r--r--source3/printing/notify.c212
1 files changed, 132 insertions, 80 deletions
diff --git a/source3/printing/notify.c b/source3/printing/notify.c
index 62169e982e..feae9c04c1 100644
--- a/source3/printing/notify.c
+++ b/source3/printing/notify.c
@@ -26,11 +26,23 @@ static TALLOC_CTX *send_ctx;
static struct notify_queue {
struct notify_queue *next, *prev;
- char *printername;
- void *buf;
+ struct spoolss_notify_msg *msg;
+ char *buf;
size_t buflen;
} *notify_queue_head = NULL;
+
+static BOOL create_send_ctx(void)
+{
+ if (!send_ctx)
+ send_ctx = talloc_init("print notify queue");
+
+ if (!send_ctx)
+ return False;
+
+ return True;
+}
+
/****************************************************************************
Turn a queue name into a snum.
****************************************************************************/
@@ -53,6 +65,49 @@ BOOL print_notify_messages_pending(void)
}
/*******************************************************************
+ Flatten data into a message.
+*******************************************************************/
+
+static BOOL flatten_message(struct notify_queue *q)
+{
+ struct spoolss_notify_msg *msg = q->msg;
+ char *buf = NULL;
+ size_t buflen = 0, len;
+
+again:
+ len = 0;
+
+ /* Pack header */
+
+ len += tdb_pack(buf + len, buflen - len, NULL, "f", msg->printer);
+
+ len += tdb_pack(buf + len, buflen - len, NULL, "ddddd",
+ msg->type, msg->field, msg->id, msg->len, msg->flags);
+
+ /* Pack data */
+
+ if (msg->len == 0)
+ len += tdb_pack(buf + len, buflen - len, NULL, "dd",
+ msg->notify.value[0], msg->notify.value[1]);
+ else
+ len += tdb_pack(buf + len, buflen - len, NULL, "B",
+ msg->len, msg->notify.data);
+
+ if (buflen != len) {
+ buf = talloc_realloc(send_ctx, buf, len);
+ if (!buf)
+ return False;
+ buflen = len;
+ goto again;
+ }
+
+ q->buf = buf;
+ q->buflen = buflen;
+
+ return True;
+}
+
+/*******************************************************************
Send the batched messages - on a per-printer basis.
*******************************************************************/
@@ -67,7 +122,12 @@ static void print_notify_send_messages_to_printer(const char *printer, unsigned
/* Count the space needed to send the messages. */
for (pq = notify_queue_head; pq; pq = pq->next) {
- if (strequal(printer, pq->printername)) {
+ if (strequal(printer, pq->msg->printer)) {
+ if (!flatten_message(pq)) {
+ DEBUG(0,("print_notify_send_messages: Out of memory\n"));
+ talloc_destroy_pool(send_ctx);
+ return;
+ }
offset += (pq->buflen + 4);
msg_count++;
}
@@ -87,7 +147,7 @@ static void print_notify_send_messages_to_printer(const char *printer, unsigned
for (pq = notify_queue_head; pq; pq = pq_next) {
pq_next = pq->next;
- if (strequal(printer, pq->printername)) {
+ if (strequal(printer, pq->msg->printer)) {
SIVAL(buf,offset,pq->buflen);
offset += 4;
memcpy(buf + offset, pq->buf, pq->buflen);
@@ -121,11 +181,11 @@ void print_notify_send_messages(unsigned int timeout)
if (!print_notify_messages_pending())
return;
- if (!send_ctx)
+ if (!create_send_ctx())
return;
while (print_notify_messages_pending())
- print_notify_send_messages_to_printer(notify_queue_head->printername, timeout);
+ print_notify_send_messages_to_printer(notify_queue_head->msg->printer, timeout);
talloc_destroy_pool(send_ctx);
}
@@ -136,113 +196,107 @@ void print_notify_send_messages(unsigned int timeout)
static void send_spoolss_notify2_msg(struct spoolss_notify_msg *msg)
{
- char *buf = NULL;
- size_t buflen = 0, len;
struct notify_queue *pnqueue, *tmp_ptr;
- /* Let's not waste any time with this */
-
- if (lp_disable_spoolss())
- return;
-
- if (!send_ctx)
- send_ctx = talloc_init("print notify queue");
-
- if (!send_ctx)
- goto fail;
-
- /* Flatten data into a message */
-
-again:
- len = 0;
-
- /* Pack header */
-
- len += tdb_pack(buf + len, buflen - len, "f", msg->printer);
-
- len += tdb_pack(buf + len, buflen - len, "ddddd",
- msg->type, msg->field, msg->id, msg->len, msg->flags);
+ /*
+ * Ensure we only have one message unique to each name/type/field/id/flags
+ * tuple. There is no point in sending multiple messages that match
+ * as they will just cause flickering updates in the client.
+ */
- /* Pack data */
+ for (tmp_ptr = notify_queue_head; tmp_ptr; tmp_ptr = tmp_ptr->next) {
+ if (tmp_ptr->msg->type == msg->type &&
+ tmp_ptr->msg->field == msg->field &&
+ tmp_ptr->msg->id == msg->id &&
+ tmp_ptr->msg->flags == msg->flags &&
+ strequal(tmp_ptr->msg->printer, msg->printer)) {
- if (msg->len == 0)
- len += tdb_pack(buf + len, buflen - len, "dd",
- msg->notify.value[0], msg->notify.value[1]);
- else
- len += tdb_pack(buf + len, buflen - len, "B",
- msg->len, msg->notify.data);
+ DEBUG(5, ("send_spoolss_notify2_msg: replacing message 0x%02x/0x%02x for printer %s \
+in notify_queue\n", msg->type, msg->field, msg->printer));
- if (buflen != len) {
- buf = talloc_realloc(send_ctx, buf, len);
- if (!buf)
- goto fail;
- buflen = len;
- goto again;
+ tmp_ptr->msg = msg;
+ return;
+ }
}
/* Store the message on the pending queue. */
pnqueue = talloc(send_ctx, sizeof(*pnqueue));
- if (!pnqueue)
- goto fail;
-
- pnqueue->printername = talloc_strdup(send_ctx, msg->printer);
- if (!pnqueue->printername)
- goto fail;
+ if (!pnqueue) {
+ DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
+ return;
+ }
- pnqueue->buf = buf;
- pnqueue->buflen = buflen;
+ pnqueue->msg = msg;
+ pnqueue->buf = NULL;
+ pnqueue->buflen = 0;
DEBUG(5, ("send_spoolss_notify2_msg: appending message 0x%02x/0x%02x for printer %s \
to notify_queue_head\n", msg->type, msg->field, msg->printer));
-
- /* Note we add to the end of the list to ensure
+
+ /*
+ * Note we add to the end of the list to ensure
* the messages are sent in the order they were received. JRA.
*/
- DLIST_ADD_END(notify_queue_head, pnqueue, tmp_ptr);
-
- return;
- fail:
-
- DEBUG(0,("send_spoolss_notify2_msg: Out of memory.\n"));
+ DLIST_ADD_END(notify_queue_head, pnqueue, tmp_ptr);
}
static void send_notify_field_values(const char *printer_name, uint32 type,
uint32 field, uint32 id, uint32 value1,
uint32 value2, uint32 flags)
{
- struct spoolss_notify_msg msg;
+ struct spoolss_notify_msg *msg;
- ZERO_STRUCT(msg);
+ if (lp_disable_spoolss())
+ return;
- fstrcpy(msg.printer, printer_name);
- msg.type = type;
- msg.field = field;
- msg.id = id;
- msg.notify.value[0] = value1;
- msg.notify.value[1] = value2;
- msg.flags = flags;
+ if (!create_send_ctx())
+ return;
- send_spoolss_notify2_msg(&msg);
+ msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
+ if (!msg)
+ return;
+
+ ZERO_STRUCTP(msg);
+
+ fstrcpy(msg->printer, printer_name);
+ msg->type = type;
+ msg->field = field;
+ msg->id = id;
+ msg->notify.value[0] = value1;
+ msg->notify.value[1] = value2;
+ msg->flags = flags;
+
+ send_spoolss_notify2_msg(msg);
}
static void send_notify_field_buffer(const char *printer_name, uint32 type,
uint32 field, uint32 id, uint32 len,
char *buffer)
{
- struct spoolss_notify_msg msg;
+ struct spoolss_notify_msg *msg;
+
+ if (lp_disable_spoolss())
+ return;
- ZERO_STRUCT(msg);
+ if (!create_send_ctx())
+ return;
+
+ msg = (struct spoolss_notify_msg *)talloc(send_ctx, sizeof(struct spoolss_notify_msg));
+ if (!msg)
+ return;
- fstrcpy(msg.printer, printer_name);
- msg.type = type;
- msg.field = field;
- msg.id = id;
- msg.len = len;
- msg.notify.data = buffer;
+ ZERO_STRUCTP(msg);
- send_spoolss_notify2_msg(&msg);
+ fstrcpy(msg->printer, printer_name);
+ msg->type = type;
+ msg->field = field;
+ msg->id = id;
+ msg->len = len;
+ msg->notify.data = buffer;
+
+ send_spoolss_notify2_msg(msg);
}
/* Send a message that the printer status has changed */
@@ -447,5 +501,3 @@ BOOL print_notify_pid_list(const char *printername, TALLOC_CTX *mem_ctx, size_t
SAFE_FREE(data.dptr);
return ret;
}
-
-