From 283563287be02e32ef8a4cad526855faf327f24e Mon Sep 17 00:00:00 2001
From: danieldg <danieldg@e03df62e-2008-0410-955e-edbf42e46eb7>
Date: Tue, 11 Aug 2009 20:41:04 +0000
Subject: Fix module prioritization when a module asks to be after
 spanningtree, which asks to be last

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@11502 e03df62e-2008-0410-955e-edbf42e46eb7
---
 src/modules.cpp | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/modules.cpp b/src/modules.cpp
index 87e2de705..66134e3bc 100644
--- a/src/modules.cpp
+++ b/src/modules.cpp
@@ -288,11 +288,16 @@ bool ModuleManager::SetPriority(Module* mod, Implementation i, Priority s, Modul
 		break;
 		/* Module wants to be first, sod everything else */
 		case PRIORITY_FIRST:
-			swap_pos = 0;
+			if (prioritizationState != PRIO_STATE_FIRST)
+				swap = false;
+			else
+				swap_pos = 0;
 		break;
-		/* Module is submissive and wants to be last... awww. */
+		/* Module wants to be last. */
 		case PRIORITY_LAST:
-			if (EventHandlers[i].empty())
+			if (prioritizationState != PRIO_STATE_FIRST)
+				swap = false;
+			else if (EventHandlers[i].empty())
 				swap_pos = 0;
 			else
 				swap_pos = EventHandlers[i].size() - 1;
@@ -339,6 +344,9 @@ bool ModuleManager::SetPriority(Module* mod, Implementation i, Priority s, Modul
 	/* Do we need to swap? */
 	if (swap && (swap_pos != source))
 	{
+		// We are going to change positions; we'll need to run again to verify all requirements
+		if (prioritizationState == PRIO_STATE_LAST)
+			prioritizationState = PRIO_STATE_AGAIN;
 		/* Suggestion from Phoenix, "shuffle" the modules to better retain call order */
 		int incrmnt = 1;
 
@@ -492,8 +500,17 @@ bool ModuleManager::Load(const char* filename)
 	 * not just the one thats loading, as the new module could affect the preference
 	 * of others
 	 */
-	for (std::map<std::string, std::pair<ircd_module*, Module*> >::iterator n = Modules.begin(); n != Modules.end(); ++n)
-		n->second.second->Prioritize();
+	for(int tries = 0; tries < 20; tries++)
+	{
+		prioritizationState = tries > 0 ? PRIO_STATE_LAST : PRIO_STATE_FIRST;
+		for (std::map<std::string, std::pair<ircd_module*, Module*> >::iterator n = Modules.begin(); n != Modules.end(); ++n)
+			n->second.second->Prioritize();
+
+		if (prioritizationState == PRIO_STATE_LAST)
+			break;
+		if (tries == 19)
+			Instance->Logs->Log("MODULE", DEFAULT, "Hook priority dependency loop detected while loading " + filename_str);
+	}
 
 	Instance->BuildISupport();
 	return true;
-- 
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