Lock submitted simulation answers

scripts/autoload/exam_simulation_service.gd

@@ -24,6 +24,7 @@ var pending_action := ""
 var request_queue: Array = []
 var request_access_token := ""
 var last_failed_action := ""
+var submit_recovery_attempts := 0
 
 
 func _ready() -> void:
@@ -69,7 +70,7 @@ func start_next_block() -> void:
 	_send("start", HTTPClient.METHOD_POST, "/%s/blocks/start" % str(simulation.get("id", "")))
 
 
-func save_response(question_id: String, choice_id: String, eliminated: Array, flagged: bool, elapsed_seconds: int) -> void:
+func save_response(question_id: String, choice_id: String, eliminated: Array, flagged: bool, elapsed_seconds: int, is_submitted := false) -> void:
 	if simulation.is_empty():
 		return
 	_send("save", HTTPClient.METHOD_PUT, "/%s/responses" % str(simulation.get("id", "")), {
@@ -77,13 +78,15 @@ func save_response(question_id: String, choice_id: String, eliminated: Array, fl
 		"choiceId": choice_id,
 		"eliminatedChoiceIds": eliminated,
 		"flagged": flagged,
-		"elapsedSeconds": elapsed_seconds
+		"elapsedSeconds": elapsed_seconds,
+		"isSubmitted": is_submitted
 	})
 
 
 func submit_block() -> void:
 	if simulation.is_empty():
 		return
+	submit_recovery_attempts = 0
 	_send("submit", HTTPClient.METHOD_POST, "/%s/blocks/submit" % str(simulation.get("id", "")))
 
 
@@ -156,6 +159,13 @@ func _on_request_completed(result: int, response_code: int, _headers: PackedStri
 	if result != HTTPRequest.RESULT_SUCCESS or response_code < 200 or response_code >= 300:
 		if _is_stale_submit_failure(action):
 			return
+		if _should_reconcile_submit_failure(action, response_code):
+			submit_recovery_attempts += 1
+			_send(
+				"submit_reconcile",
+				HTTPClient.METHOD_GET,
+				"/%s" % str(simulation.get("id", "")).uri_encode())
+			return
 		var server_message := body.get_string_from_utf8().strip_edges()
 		var error_parsed: Variant = JSON.parse_string(server_message)
 		if typeof(error_parsed) == TYPE_DICTIONARY:
@@ -205,12 +215,27 @@ func _on_request_completed(result: int, response_code: int, _headers: PackedStri
 		return
 	simulation = _normalize_simulation(parsed)
 	state_changed.emit()
+	if action == "submit":
+		submit_recovery_attempts = 0
+	elif action == "submit_reconcile":
+		if str(simulation.get("state", "")) == "block_active":
+			_send("submit", HTTPClient.METHOD_POST, "/%s/blocks/submit" % str(simulation.get("id", "")))
+		else:
+			submit_recovery_attempts = 0
 
 
 func _is_stale_submit_failure(action: String) -> bool:
 	return action == "submit" and str(simulation.get("state", "")) in ["between_blocks", "completed"]
 
 
+func _should_reconcile_submit_failure(action: String, response_code: int) -> bool:
+	return (
+		action == "submit" and
+		response_code == 409 and
+		submit_recovery_attempts == 0 and
+		str(simulation.get("state", "")) == "block_active")
+
+
 func _process_request_queue() -> void:
 	if is_loading or request_queue.is_empty():
 		return