app_queue: 'agent available' hint, cleanup restart, and initial state

Fix previously untested senarios;

1). On queue initialisation set queue_avail devstate to INUSE.
    Previously was unavailable, which indicated an agent was available.

2). When removing members, if there are no other members available, set queue_avail to INUSE.
    Previously, if a member interface had become 'unavailable', they were never going to be removed, particularly when persistant queues is enabled.

3). When adding a member, check that they are available, if they are set queue_avail to NOT_INUSE.
 Previously on reloaded, members may have been 'unavailable'.

4). When pausing or unpausing a member, set appropriate queue availability. 

alecdavis (license 585)
Reported by: Alec Davis
Tested by: alecdavis

Review: https://reviewboard.asterisk.org/r/2129/



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@373804 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -2018,6 +2018,15 @@ static void init_queue(struct call_queue *q)
 	while ((pr_iter = AST_LIST_REMOVE_HEAD(&q->rules,list))) {
 		ast_free(pr_iter);
 	}
+
+	/* On restart assume no members are available.
+	 * The queue_avail hint is a boolean state to indicate whether a member is available or not.
+	 *
+	 * This seems counter intuitive, but is required to light a BLF
+	 * AST_DEVICE_INUSE indicates no members are available.
+	 * AST_DEVICE_NOT_INUSE indicates a member is available.
+	 */
+	ast_devstate_changed(AST_DEVICE_INUSE, "Queue:%s_avail", q->name);
 }
 
 static void clear_queue(struct call_queue *q)
@@ -5899,7 +5908,7 @@ static int remove_from_queue(const char *queuename, const char *interface)
 				dump_queue_members(q);
 			}
 
-			if (!ao2_container_count(q->members)) {
+			if (!num_available_members(q)) {
 				ast_devstate_changed(AST_DEVICE_INUSE, "Queue:%s_avail", q->name);
 			}
 
@@ -5976,6 +5985,10 @@ static int add_to_queue(const char *queuename, const char *interface, const char
 				new_member->penalty, new_member->calls, (int) new_member->lastcall,
 				new_member->status, new_member->paused);
 
+			if (is_member_available(new_member)) {
+				ast_devstate_changed(AST_DEVICE_NOT_INUSE, "Queue:%s_avail", q->name);
+			}
+
 			ao2_ref(new_member, -1);
 			new_member = NULL;
 
@@ -5983,10 +5996,6 @@ static int add_to_queue(const char *queuename, const char *interface, const char
 				dump_queue_members(q);
 			}
 
-			if (ao2_container_count(q->members) == 1) {
-				ast_devstate_changed(AST_DEVICE_NOT_INUSE, "Queue:%s_avail", q->name);
-			}
-
 			res = RES_OKAY;
 		} else {
 			res = RES_OUTOFMEMORY;
@@ -6042,6 +6051,12 @@ static int set_member_paused(const char *queuename, const char *interface, const
 					dump_queue_members(q);
 				}
 
+				if (is_member_available(mem)) {
+					ast_devstate_changed(AST_DEVICE_NOT_INUSE, "Queue:%s_avail", q->name);
+				} else if (!num_available_members(q)) {
+					ast_devstate_changed(AST_DEVICE_INUSE, "Queue:%s_avail", q->name);
+				}
+
 				ast_queue_log(q->name, "NONE", mem->membername, (paused ? "PAUSE" : "UNPAUSE"), "%s", S_OR(reason, ""));
 
 				/*** DOCUMENTATION