prosody
ec013f93de81
core/loggingmanager.lua

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core/loggingmanager.lua @ 1031:ec013f93de81

core.loggingmanager: Refactoring, converted to a module. Now possible to register additional sink types (think syslog) from other modules
author Matthew Wild <mwild1@gmail.com>
date Wed, 22 Apr 2009 19:49:58 +0100
parent 1024:1bcc8ca57a7c
child 1046:6fef969ff307
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1
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2 local format, rep = string.format, string.rep;
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3 local pcall = pcall;
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4 local debug = debug;
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5 local tostring, setmetatable, rawset, pairs, ipairs, type =
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6 tostring, setmetatable, rawset, pairs, ipairs, type;
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7 local io_open, io_write = io.open, io.write;
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8 local math_max, rep = math.max, string.rep;
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9 local os_getenv = os.getenv;
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10 local getstyle, getstring = require "util.termcolours".getstyle, require "util.termcolours".getstring;
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11
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12 local config = require "core.configmanager";
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14 local logger = require "util.logger";
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16 module "loggingmanager"
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18 -- The log config used if none specified in the config file
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19 local default_logging = { { to = "console" } };
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21 -- The actual config loggingmanager is using
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22 local logging_config = config.get("*", "core", "log") or default_logging;
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24 local apply_sink_rules;
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25 local log_sink_types = setmetatable({}, { __newindex = function (t, k, v) rawset(t, k, v); apply_sink_rules(k); end; });
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26 local get_levels;
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27 local logging_levels = { "debug", "info", "warn", "error", "critical" }
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29 local function add_rule(sink_config)
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30 local sink_maker = log_sink_types[sink_config.to];
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31 if sink_maker then
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32 if sink_config.levels and not sink_config.source then
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33 -- Create sink
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34 local sink = sink_maker(sink_config);
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35
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36 -- Set sink for all chosen levels
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37 for level in pairs(get_levels(sink_config.levels)) do
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38 logger.add_level_sink(level, sink);
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39 end
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40 elseif sink_config.source and not sink_config.levels then
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41 logger.add_name_sink(sink_config.source, sink_maker(sink_config));
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42 elseif sink_config.source and sink_config.levels then
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43 local levels = get_levels(sink_config.levels);
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44 local sink = sink_maker(sink_config);
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45 logger.add_name_sink(sink_config.source,
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46 function (name, level, ...)
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47 if levels[level] then
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48 return sink(name, level, ...);
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49 end
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50 end);
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51 else
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52 -- All sources
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53 -- Create sink
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54 local sink = sink_maker(sink_config);
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55
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56 -- Set sink for all levels
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57 for _, level in pairs(logging_levels) do
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58 logger.add_level_sink(level, sink);
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59 end
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60 end
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61 else
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62 -- No such sink type
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63 end
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64 end
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65
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66 -- Search for all rules using a particular sink type,
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67 -- and apply them
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68 function apply_sink_rules(sink_type)
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69 if type(logging_config) == "table" then
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70 for _, sink_config in pairs(logging_config) do
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71 if sink_config.to == sink_type then
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72 add_rule(sink_config);
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73 end
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74 end
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75 elseif type(logging_config) == "string" and sink_type == "file" then
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76 -- User specified simply a filename, and the "file" sink type
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77 -- was just added
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78 end
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79 end
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81
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82
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83 --- Helper function to get a set of levels given a "criteria" table
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84 function get_levels(criteria, set)
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85 set = set or {};
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86 if type(criteria) == "string" then
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87 set[criteria] = true;
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88 return set;
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89 end
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90 local min, max = criteria.min, criteria.max;
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91 if min or max then
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92 local in_range;
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93 for _, level in ipairs(logging_levels) do
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94 if min == level then
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95 set[level] = true;
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96 in_range = true;
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97 elseif max == level then
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98 set[level] = true;
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99 return set;
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100 elseif in_range then
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101 set[level] = true;
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102 end
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103 end
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104 end
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105
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106 for _, level in ipairs(criteria) do
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107 set[level] = true;
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108 end
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109 return set;
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110 end
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111
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112 --- Definition of built-in logging sinks ---
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113
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114 function log_sink_types.nowhere()
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115 return function () return false; end;
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116 end
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117
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118 -- Column width for "source" (used by stdout and console)
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119 local sourcewidth = 20;
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120
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121 function log_sink_types.stdout()
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122 return function (name, level, message, ...)
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123 sourcewidth = math_max(#name+2, sourcewidth);
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124 local namelen = #name;
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125 if ... then
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126 io_write(name, rep(" ", sourcewidth-namelen), level, "\t", format(message, ...), "\n");
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127 else
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128 io_write(name, rep(" ", sourcewidth-namelen), level, "\t", message, "\n");
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129 end
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130 end
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131 end
1021
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132
1031
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133 do
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134 local do_pretty_printing = not os_getenv("WINDIR");
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135
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136 local logstyles = {};
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137 if do_pretty_printing then
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138 logstyles["info"] = getstyle("bold");
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139 logstyles["warn"] = getstyle("bold", "yellow");
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140 logstyles["error"] = getstyle("bold", "red");
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141 end
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142 function log_sink_types.console(config)
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143 -- Really if we don't want pretty colours then just use plain stdout
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144 if not do_pretty_printing then
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145 return log_sink_types.stdout(config);
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146 end
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147
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148 return function (name, level, message, ...)
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149 sourcewidth = math_max(#name+2, sourcewidth);
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150 local namelen = #name;
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151 if ... then
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152 io_write(name, rep(" ", sourcewidth-namelen), getstring(logstyles[level], level), "\t", format(message, ...), "\n");
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153 else
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154 io_write(name, rep(" ", sourcewidth-namelen), getstring(logstyles[level], level), "\t", message, "\n");
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155 end
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156 end
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157 end
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158 end
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159
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160 function log_sink_types.file(config)
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161 local log = config.filename;
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162 local logfile = io_open(log, "a+");
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163 if not logfile then
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164 return function () end
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165 end
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166
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167 local write, format, flush = logfile.write, format, logfile.flush;
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168 return function (name, level, message, ...)
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169 if ... then
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170 write(logfile, name, "\t", level, "\t", format(message, ...), "\n");
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171 else
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172 write(logfile, name, "\t" , level, "\t", message, "\n");
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173 end
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174 flush(logfile);
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175 end;
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176 end
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177
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178 function register_sink_type(name, sink_maker)
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179 local old_sink_maker = log_sink_types[name];
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180 log_sink_types[name] = sink_maker;
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181 return old_sink_maker;
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182 end
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183
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184 return _M;