mod_mam,mod_muc_mam: Allow other work to be performed during archive cleanup (fixes #1504) This lets Prosody handle socket related work between each step in the cleanup in order to prevent the server from being completely blocked during this. An async storage backend would not need this but those are currently rare.

author: Kim Alvefur <zash@zash.se>
date: Wed, 11 Mar 2020 21:15:01 +0100
parent: 10567:3df479098696
child: 10683:2f0b7f1d5e75
--- a/plugins/mod_mam/mod_mam.lua	Wed Mar 11 18:07:03 2020 +0100
+++ b/plugins/mod_mam/mod_mam.lua	Wed Mar 11 21:15:01 2020 +0100
@@ -362,7 +362,8 @@
 		end
 	end
 
-	cleanup_runner = require "util.async".runner(function ()
+	local async = require "util.async";
+	cleanup_runner = async.runner(function ()
 		local users = {};
 		local cut_off = datestamp(os.time() - cleanup_after);
 		for date in cleanup_storage:users() do
@@ -391,6 +392,9 @@
 				cleanup_map:set(cut_off, user, true);
 				module:log("error", "Could not delete messages for user '%s': %s", user, err);
 			end
+			local wait, done = async.waiter();
+			module:add_timer(0.01, done);
+			wait();
 		end
 		module:log("info", "Deleted %d expired messages for %d users", sum, num_users);
 	end);