prosody
e7808f8d7d11
util/helpers.lua

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util/helpers.lua @ 8519:e7808f8d7d11

MUC: Prevent traceback in case of no history items to serialize (fixes #1083)
author Kim Alvefur <zash@zash.se>
date Thu, 15 Feb 2018 02:54:52 +0100
parent 8411:a9e8523a5e73
child 11059:ad89e3cc67b6
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1964
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local debug = require "util.debug";
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10
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11 -- Helper functions for debugging
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12
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13 local log = require "util.logger".init("util.debug");
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14
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15 local function log_events(events, name, logger)
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16 local f = events.fire_event;
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17 if not f then
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18 error("Object does not appear to be a util.events object");
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19 end
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20 logger = logger or log;
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21 name = name or tostring(events);
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22 function events.fire_event(event, ...)
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23 logger("debug", "%s firing event: %s", name, event);
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24 return f(event, ...);
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25 end
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26 events[events.fire_event] = f;
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27 return events;
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28 end
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29
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30 local function revert_log_events(events)
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31 events.fire_event, events[events.fire_event] = events[events.fire_event], nil; -- :))
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32 end
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33
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34 local function log_host_events(host)
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35 return log_events(prosody.hosts[host].events, host);
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36 end
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37
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38 local function revert_log_host_events(host)
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39 return revert_log_events(prosody.hosts[host].events);
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40 end
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41
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42 local function show_events(events, specific_event)
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43 local event_handlers = events._handlers;
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44 local events_array = {};
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45 local event_handler_arrays = {};
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46 for event, priorities in pairs(events._event_map) do
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47 local handlers = event_handlers[event];
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48 if handlers and (event == specific_event or not specific_event) then
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49 table.insert(events_array, event);
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50 local handler_strings = {};
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51 for i, handler in ipairs(handlers) do
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52 local upvals = debug.string_from_var_table(debug.get_upvalues_table(handler));
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53 handler_strings[i] = " "..(priorities[handler] or "?")..": "..tostring(handler)..(upvals and ("\n "..upvals) or "");
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54 end
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55 event_handler_arrays[event] = handler_strings;
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56 end
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57 end
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58 table.sort(events_array);
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59 local i = 1;
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60 while i <= #events_array do
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61 local handlers = event_handler_arrays[events_array[i]];
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62 for j=#handlers, 1, -1 do
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63 table.insert(events_array, i+1, handlers[j]);
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64 end
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65 if i > 1 then events_array[i] = "\n"..events_array[i]; end
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66 i = i + #handlers + 1
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67 end
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68 return table.concat(events_array, "\n");
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69 end
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70
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71 local function get_upvalue(f, get_name)
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72 local i, name, value = 0;
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73 repeat
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74 i = i + 1;
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75 name, value = debug.getupvalue(f, i);
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76 until name == get_name or name == nil;
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77 return value;
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78 end
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79
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80 return {
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81 log_host_events = log_host_events;
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82 revert_log_host_events = revert_log_host_events;
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83 log_events = log_events;
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84 revert_log_events = revert_log_events;
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85 show_events = show_events;
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86 get_upvalue = get_upvalue;
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87 };