Annotate

util/logger.lua @ 12514:194469fb46f9

net.server_epoll: Wrap LuaSocket object earlier to reuse option setting method Since it provides some protection and error handling in the form of logging.
author Kim Alvefur <zash@zash.se>
date Fri, 16 Jul 2021 00:57:42 +0200
parent 12395:1e34b910b73a
child 12975:d10957394a3c
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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 -- luacheck: ignore 213/level
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9
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10 local pairs = pairs;
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11 local ipairs = ipairs;
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12 local require = require;
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13 local t_remove = table.remove;
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15 local _ENV = nil;
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16 -- luacheck: std none
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18 local level_sinks = {};
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19
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20 local make_logger;
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21
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22 local function init(name)
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23 local log_debug = make_logger(name, "debug");
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24 local log_info = make_logger(name, "info");
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25 local log_warn = make_logger(name, "warn");
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26 local log_error = make_logger(name, "error");
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28 return function (level, message, ...)
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29 if level == "debug" then
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30 return log_debug(message, ...);
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31 elseif level == "info" then
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32 return log_info(message, ...);
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33 elseif level == "warn" then
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34 return log_warn(message, ...);
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35 elseif level == "error" then
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36 return log_error(message, ...);
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37 end
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38 end
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39 end
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41 function make_logger(source_name, level)
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42 local level_handlers = level_sinks[level];
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43 if not level_handlers then
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44 level_handlers = {};
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45 level_sinks[level] = level_handlers;
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46 end
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48 local logger = function (message, ...)
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49 for i = 1,#level_handlers do
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50 level_handlers[i](source_name, level, message, ...);
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51 end
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52 end
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53
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54 return logger;
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55 end
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56
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57 local function reset()
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58 for level, handler_list in pairs(level_sinks) do
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59 -- Clear all handlers for this level
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60 for i = 1, #handler_list do
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61 handler_list[i] = nil;
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62 end
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63 end
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64 end
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65
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66 local function add_level_sink(level, sink_function)
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67 if not level_sinks[level] then
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68 level_sinks[level] = { sink_function };
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69 else
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70 level_sinks[level][#level_sinks[level] + 1 ] = sink_function;
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71 end
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72 end
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73
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74 local function add_simple_sink(simple_sink_function, levels)
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75 local format = require "util.format".format;
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76 local function sink_function(name, level, msg, ...)
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77 return simple_sink_function(name, level, format(msg, ...));
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78 end
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79 for _, level in ipairs(levels or {"debug", "info", "warn", "error"}) do
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80 add_level_sink(level, sink_function);
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81 end
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82 return sink_function;
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83 end
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84
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85 local function remove_sink(sink_function)
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86 local removed;
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87 for level, sinks in pairs(level_sinks) do
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88 for i = #sinks, 1, -1 do
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89 if sinks[i] == sink_function then
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90 t_remove(sinks, i);
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91 removed = true;
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92 end
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93 end
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94 end
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95 return removed;
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96 end
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97
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98 return {
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99 init = init;
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100 make_logger = make_logger;
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101 reset = reset;
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102 add_level_sink = add_level_sink;
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103 add_simple_sink = add_simple_sink;
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104 new = make_logger;
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105 remove_sink = remove_sink;
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106 };