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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local debug = require "prosody.util.debug";
-- Helper functions for debugging
local log = require "prosody.util.logger".init("util.debug");
local function log_events(events, name, logger)
local f = events.fire_event;
if not f then
error("Object does not appear to be a util.events object");
end
logger = logger or log;
name = name or tostring(events);
function events.fire_event(event, ...)
logger("debug", "%s firing event: %s", name, event);
return f(event, ...);
end
local function event_handler_hook(handler, event_name, event_data)
logger("debug", "calling handler for %s: %s", event_name, handler);
local ok, ret = pcall(handler, event_data);
if not ok then
logger("error", "error in event handler %s: %s", handler, ret);
error(ret);
end
if ret ~= nil then
logger("debug", "event chain ended for %s by %s with result: %s", event_name, handler, ret);
end
return ret;
end
events.set_debug_hook(event_handler_hook);
events[events.fire_event] = f;
return events;
end
local function revert_log_events(events)
events.fire_event, events[events.fire_event] = events[events.fire_event], nil; -- :))
events.set_debug_hook(nil);
end
local function log_host_events(host)
return log_events(prosody.hosts[host].events, host);
end
local function revert_log_host_events(host)
return revert_log_events(prosody.hosts[host].events);
end
local function show_events(events, specific_event)
local event_handlers = events._handlers;
local events_array = {};
local event_handler_arrays = {};
for event, priorities in pairs(events._event_map) do
local handlers = event_handlers[event];
if handlers and (event == specific_event or not specific_event) then
table.insert(events_array, event);
local handler_strings = {};
for i, handler in ipairs(handlers) do
local upvals = debug.string_from_var_table(debug.get_upvalues_table(handler));
handler_strings[i] = " "..(priorities[handler] or "?")..": "..tostring(handler)..(upvals and ("\n "..upvals) or "");
end
event_handler_arrays[event] = handler_strings;
end
end
table.sort(events_array);
local i = 1;
while i <= #events_array do
local handlers = event_handler_arrays[events_array[i]];
for j=#handlers, 1, -1 do
table.insert(events_array, i+1, handlers[j]);
end
if i > 1 then events_array[i] = "\n"..events_array[i]; end
i = i + #handlers + 1
end
return table.concat(events_array, "\n");
end
local function get_upvalue(f, get_name)
local i, name, value = 0;
repeat
i = i + 1;
name, value = debug.getupvalue(f, i);
until name == get_name or name == nil;
return value;
end
return {
log_host_events = log_host_events;
revert_log_host_events = revert_log_host_events;
log_events = log_events;
revert_log_events = revert_log_events;
show_events = show_events;
get_upvalue = get_upvalue;
};
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