[MIRROR] Refactors ghost query to not use sleep (#10399)

Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/__defines/dcs/signals.dm

@@ -31,6 +31,9 @@
 
 //////////////////////////////////////////////////////////////////
 
+/// Signal that gets sent when a ghost query is completed
+#define COMSIG_GHOST_QUERY_COMPLETE "ghost_query_complete"
+
 // /datum signals
 /// when a component is added to a datum: (/datum/component)
 #define COMSIG_COMPONENT_ADDED "component_added"

code/datums/ghost_query.dm

@@ -11,6 +11,10 @@
 	var/wait_time = 60 SECONDS 	// How long to wait until returning the list of candidates.
 	var/cutoff_number = 0		// If above 0, when candidates list reaches this number, further potential candidates are rejected.
 
+/datum/ghost_query/Destroy(force)
+	candidates = null
+	. = ..()
+
 /// Begin the ghost asking
 /datum/ghost_query/proc/query()
 	// First, ask all the ghosts who want to be asked.
@@ -19,20 +23,21 @@
 			ask_question(D)
 
 	// Then wait awhile.
-	while(!finished)
-		sleep(1 SECOND)
-		wait_time -= 1 SECOND
-		if(wait_time <= 0)
-			finished = TRUE
+	if(wait_time)
+		our_timer(wait_time)
+		return
 
-	// Prune the list after the wait, incase any candidates logged out.
+/datum/ghost_query/proc/our_timer(var/current_wait_time)
+	if(current_wait_time)
+		addtimer(CALLBACK(src, PROC_REF(our_timer), FALSE), current_wait_time, TIMER_DELETE_ME)
+	else
 		for(var/mob/observer/dead/D as anything in candidates)
 			if(!evaluate_candidate(D))
 				candidates -= D
-
-	// Now we're done.
 		finished = TRUE
-	return candidates
+		SEND_SIGNAL(src, COMSIG_GHOST_QUERY_COMPLETE)
+
+
 
 /// Test a candidate for allowance to join as this
 /datum/ghost_query/proc/evaluate_candidate(mob/observer/dead/candidate)
@@ -52,10 +57,8 @@
 
 /// Send async alerts and ask for responses. Expects you to have tested D for client and type already
 /datum/ghost_query/proc/ask_question(var/mob/observer/dead/D)
-	//VOREStation Add Start		Check the ban status before we ask
 	if(jobban_isbanned(D, JOB_GHOSTROLES))
 		return
-	//VOREStation Add End
 
 	var/client/C = D.client
 	window_flash(C)

code/game/objects/items/antag_spawners.dm

@@ -4,6 +4,7 @@
 	var/ghost_query_type = null
 	var/searching = FALSE
 	var/datum/effect/effect/system/spark_spread/sparks
+	var/datum/ghost_query/Q //This is used so we can unregister ourself.
 
 /obj/item/antag_spawner/New()
 	..()
@@ -28,13 +29,18 @@
 		return // Already searching.
 	searching = TRUE
 
-	var/datum/ghost_query/Q = new ghost_query_type()
-	var/list/winner = Q.query()
-	if(winner.len)
-		var/mob/observer/dead/D = winner[1]
+	Q = new ghost_query_type()
+	RegisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE, PROC_REF(get_winner))
+	Q.query()
+
+/obj/item/antag_spawner/proc/get_winner()
+	if(Q && Q.candidates.len)
+		var/mob/observer/dead/D = Q.candidates[1]
 		spawn_antag(D.client, get_turf(src))
 	else
 		reset_search()
+	UnregisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE)
+	qdel_null(Q) //get rid of the query
 	return
 
 /obj/item/antag_spawner/proc/reset_search()

code/game/objects/structures/ghost_pods/ghost_pods.dm

@@ -8,7 +8,10 @@
 	var/used = FALSE
 	var/busy = FALSE // Don't spam ghosts by spamclicking.
 	var/needscharger //For drone pods that want their pod to turn into a charger.
+	var/datum/ghost_query/Q //This is used so we can unregister ourself.
 	unacidable = TRUE
+	var/delay_to_self_open = 0 // How long to wait for first attempt.  Note that the timer by default starts when the pod is created.
+	var/delay_to_try_again = 0 // How long to wait if first attempt fails.  Set to 0 to never try again.
 
 // Call this to get a ghost volunteer.
 /obj/structure/ghost_pod/proc/trigger(var/alert, var/adminalert)
@@ -22,19 +25,27 @@
 	if(adminalert)
 		log_and_message_admins(adminalert)
 	busy = TRUE
-	var/datum/ghost_query/Q = new ghost_query_type()
-	var/list/winner = Q.query()
+	Q = new ghost_query_type()
+	RegisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE, PROC_REF(get_winner))
+	Q.query()
+
+/obj/structure/ghost_pod/proc/get_winner()
 	busy = FALSE
-	if(winner.len)
-		var/mob/observer/dead/D = winner[1]
+	var/deletion_candidate = FALSE
+	if(Q && Q.candidates.len) //Q should NEVER get deleted but...whatever, sanity.
+		var/mob/observer/dead/D = Q.candidates[1]
 		create_occupant(D)
 		icon_state = icon_state_opened
 		if(needscharger)
 			new /obj/machinery/recharge_station/ghost_pod_recharger(src.loc)
-			qdel(src)
-		return TRUE
+			deletion_candidate = TRUE
 	else
-		return FALSE
+		if(delay_to_try_again)
+			addtimer(CALLBACK(src, PROC_REF(trigger)), delay_to_try_again)
+	UnregisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE)
+	qdel_null(Q) //get rid of the query
+	if(deletion_candidate)
+		qdel(src)
 
 // Override this to create whatever mob you need. Be sure to call ..() if you don't want it to make infinite mobs.
 /obj/structure/ghost_pod/proc/create_occupant(var/mob/M)
@@ -68,8 +79,8 @@
 
 // This type is triggered on a timer, as opposed to needing another player to 'open' the pod.  Good for away missions.
 /obj/structure/ghost_pod/automatic
-	var/delay_to_self_open = 10 MINUTES // How long to wait for first attempt.  Note that the timer by default starts when the pod is created.
-	var/delay_to_try_again = 20 MINUTES // How long to wait if first attempt fails.  Set to 0 to never try again.
+	delay_to_self_open = 10 MINUTES
+	delay_to_try_again = 20 MINUTES
 
 /obj/structure/ghost_pod/automatic/Initialize(mapload)
 	. = ..()

code/modules/blob2/blobs/core.dm

@@ -18,6 +18,7 @@ var/list/blob_cores = list()
 	var/resource_delay = 0
 	var/point_rate = 2
 	var/ai_controlled = TRUE
+	var/datum/ghost_query/Q //This is used so we can unregister ourself.
 
 // Spawn this if you want a ghost to be able to play as the blob.
 /obj/structure/blob/core/player
@@ -152,38 +153,8 @@ var/list/blob_cores = list()
 /obj/structure/blob/core/proc/create_overmind(client/new_overmind, override_delay)
 	if(overmind_get_delay > world.time && !override_delay)
 		return
-	if(!ai_controlled) // Do we want a bona fide player blob?
-		overmind_get_delay = world.time + 15 SECONDS //if this fails, we'll try again in 15 seconds
 
-		if(overmind)
-			qdel(overmind)
-
-
-		var/client/C = null
-		if(!new_overmind)
-			var/datum/ghost_query/Q = new /datum/ghost_query/blob()
-			var/list/winner = Q.query()
-			if(winner.len)
-				var/mob/observer/dead/D = winner[1]
-				C = D.client
-
-		else
-			C = new_overmind
-
-		if(C)
-			if(!desired_blob_type && !isnull(difficulty_threshold))
-				desired_blob_type = get_random_blob_type()
-			var/mob/observer/blob/B = new(loc, TRUE, 60, desired_blob_type)
-			B.key = C.key
-			B.blob_core = src
-			src.overmind = B
-			update_icon()
-			if(B.mind && !B.mind.special_role)
-				B.mind.special_role = "Blob Overmind"
-			return TRUE
-		return FALSE
-
-	else // An AI opponent.
+	if(ai_controlled)
 		if(!desired_blob_type && !isnull(difficulty_threshold))
 			desired_blob_type = get_random_blob_type()
 		var/mob/observer/blob/B = new(loc, TRUE, 60, desired_blob_type)
@@ -193,6 +164,47 @@ var/list/blob_cores = list()
 		update_icon()
 		return TRUE
 
+	overmind_get_delay = world.time + 15 SECONDS //if this fails, we'll try again in 15 seconds
+
+	if(overmind)
+		qdel(overmind)
+
+
+	var/client/C = null
+	if(!new_overmind)
+		Q = new /datum/ghost_query/blob()
+		RegisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE, PROC_REF(get_winner))
+		Q.query()
+
+	else
+		C = new_overmind
+		overmind_creation(C)
+
+/obj/structure/blob/core/proc/get_winner()
+	if(Q && Q.candidates.len) //Q should NEVER get deleted but...whatever, sanity.
+		var/mob/observer/dead/D = Q.candidates[1]
+		var/client/C
+		C = D.client
+		overmind_creation(C)
+	UnregisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE)
+	qdel_null(Q) //get rid of the query
+
+
+
+/obj/structure/blob/core/proc/overmind_creation(var/client/new_overmind)
+	if(new_overmind)
+		if(!desired_blob_type && !isnull(difficulty_threshold))
+			desired_blob_type = get_random_blob_type()
+		var/mob/observer/blob/B = new(loc, TRUE, 60, desired_blob_type)
+		B.key = new_overmind.key
+		B.blob_core = src
+		src.overmind = B
+		update_icon()
+		if(B.mind && !B.mind.special_role)
+			B.mind.special_role = "Blob Overmind"
+		return TRUE
+	return FALSE
+
 /obj/structure/blob/core/proc/get_random_blob_type()
 	if(!difficulty_threshold)
 		return

code/modules/mob/living/carbon/brain/MMI.dm

@@ -180,6 +180,7 @@
 	locked = 0
 	mecha = null//This does not appear to be used outside of reference in mecha.dm.
 	var/ghost_query_type = null
+	var/datum/ghost_query/Q //This is used so we can unregister ourself.
 
 /obj/item/mmi/digital/New()
 	src.brainmob = new(src)
@@ -245,13 +246,18 @@
 		return
 	searching = 1
 
-	var/datum/ghost_query/Q = new ghost_query_type()
-	var/list/winner = Q.query()
-	if(winner.len)
-		var/mob/observer/dead/D = winner[1]
+	Q = new ghost_query_type()
+	RegisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE, PROC_REF(get_winner))
+	Q.query()
+
+/obj/item/mmi/digital/proc/get_winner()
+	if(Q && Q.candidates.len) //Q should NEVER get deleted but...whatever, sanity.
+		var/mob/observer/dead/D = Q.candidates[1]
 		transfer_personality(D)
 	else
 		reset_search()
+	UnregisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE)
+	qdel_null(Q) //get rid of the query
 
 /obj/item/mmi/digital/proc/reset_search() //We give the players sixty seconds to decide, then reset the timer.
 	if(src.brainmob && src.brainmob.key)

code/modules/mob/living/simple_mob/subtypes/animal/borer/borer.dm

@@ -42,6 +42,7 @@
 
 	var/has_reproduced = FALSE
 	var/used_dominate							// world.time when the dominate power was last used.
+	var/datum/ghost_query/Q						// Used to unregister our signal
 
 	can_be_drop_prey = FALSE //CHOMP Add
 
@@ -182,11 +183,16 @@
 	host = null
 
 /mob/living/simple_mob/animal/borer/proc/request_player()
-	var/datum/ghost_query/Q = new /datum/ghost_query/borer()
-	var/list/winner = Q.query() // This will sleep the proc for awhile.
-	if(winner.len)
-		var/mob/observer/dead/D = winner[1]
+	Q = new /datum/ghost_query/borer()
+	RegisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE, PROC_REF(get_winner))
+	Q.query() // This will sleep the proc for awhile.
+
+/mob/living/simple_mob/animal/borer/proc/get_winner()
+	if(Q && Q.candidates.len) //Q should NEVER get deleted but...whatever, sanity.
+		var/mob/observer/dead/D = Q.candidates[1]
 		transfer_personality(D)
+	UnregisterSignal(Q, COMSIG_GHOST_QUERY_COMPLETE)
+	qdel_null(Q) //get rid of the query
 
 /mob/living/simple_mob/animal/borer/proc/transfer_personality(mob/candidate)
 	if(!candidate || !candidate.mind)