mod_debug_reset: New module to "reset" a running server (e.g. for testing)

Plan to use this for integration tests.

plugins/mod_debug_reset.lua

@@ -0,0 +1,41 @@
+-- This module will "reset" the server when the client connection count drops
+-- to zero. This is somewhere between a reload and a full process restart.
+-- It is useful to ensure isolation between test runs, for example. It may
+-- also be of use for some kinds of manual testing.
+
+module:set_global();
+
+local hostmanager = require "core.hostmanager";
+local modulemanager = require "core.modulemanager";
+
+local timer = require "util.timer";
+
+local function do_reset()
+	module:log("info", "Performing reset...");
+	local hosts = {};
+	for host in pairs(prosody.hosts) do
+		table.insert(hosts, host);
+	end
+	module:fire_event("server-resetting");
+	for _, host in ipairs(hosts) do
+		hostmanager.deactivate(host);
+		timer.add_task(0, function ()
+			hostmanager.activate(host);
+			module:log("info", "Reset complete");
+			module:fire_event("server-reset");
+		end);
+	end
+end
+
+function module.add_host(host_module)
+	host_module:hook("resource-unbind", function ()
+		if next(prosody.full_sessions) == nil then
+			timer.add_task(0, do_reset);
+		end
+	end);
+end
+
+local console_env = module:shared("/*/admin_shell/env");
+console_env.debug_reset = {
+	reset = do_reset;
+};