prosody
e6fed1d80116
util/debug.lua

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util/debug.lua @ 5915:e6fed1d80116

Back out 1b0ac7950129, as SSLv3 appears to still be in moderate use on the network. Also, although obsolete, SSLv3 isn't documented to have any weaknesses that TLS 1.0 (the most common version used today) doesn't also have. Get your act together clients!
author Matthew Wild <mwild1@gmail.com>
date Tue, 12 Nov 2013 02:13:01 +0000
parent 4778:127de6eec433
child 5776:bd0ff8ae98a8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Variables ending with these names will not
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2 -- have their values printed ('password' includes
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3 -- 'new_password', etc.)
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4 local censored_names = {
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5 password = true;
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6 passwd = true;
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7 pass = true;
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8 pwd = true;
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9 };
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10 local optimal_line_length = 65;
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11
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12 local termcolours = require "util.termcolours";
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13 local getstring = termcolours.getstring;
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14 local styles;
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15 do
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16 _ = termcolours.getstyle;
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17 styles = {
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18 boundary_padding = _("bright");
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19 filename = _("bright", "blue");
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20 level_num = _("green");
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21 funcname = _("yellow");
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22 location = _("yellow");
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23 };
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24 end
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25 module("debugx", package.seeall);
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26
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27 function get_locals_table(level)
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28 level = level + 1; -- Skip this function itself
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29 local locals = {};
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30 for local_num = 1, math.huge do
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31 local name, value = debug.getlocal(level, local_num);
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32 if not name then break; end
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33 table.insert(locals, { name = name, value = value });
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34 end
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35 return locals;
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36 end
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37
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38 function get_upvalues_table(func)
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39 local upvalues = {};
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40 if func then
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41 for upvalue_num = 1, math.huge do
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42 local name, value = debug.getupvalue(func, upvalue_num);
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43 if not name then break; end
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44 table.insert(upvalues, { name = name, value = value });
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45 end
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46 end
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47 return upvalues;
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48 end
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49
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50 function string_from_var_table(var_table, max_line_len, indent_str)
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51 local var_string = {};
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52 local col_pos = 0;
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53 max_line_len = max_line_len or math.huge;
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54 indent_str = "\n"..(indent_str or "");
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55 for _, var in ipairs(var_table) do
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56 local name, value = var.name, var.value;
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57 if name:sub(1,1) ~= "(" then
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58 if type(value) == "string" then
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59 if censored_names[name:match("%a+$")] then
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60 value = "<hidden>";
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61 else
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62 value = ("%q"):format(value);
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63 end
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64 else
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65 value = tostring(value);
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66 end
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67 if #value > max_line_len then
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68 value = value:sub(1, max_line_len-3).."…";
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69 end
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70 local str = ("%s = %s"):format(name, tostring(value));
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71 col_pos = col_pos + #str;
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72 if col_pos > max_line_len then
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73 table.insert(var_string, indent_str);
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74 col_pos = 0;
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75 end
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76 table.insert(var_string, str);
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77 end
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78 end
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79 if #var_string == 0 then
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80 return nil;
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81 else
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82 return "{ "..table.concat(var_string, ", "):gsub(indent_str..", ", indent_str).." }";
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83 end
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84 end
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85
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86 function get_traceback_table(thread, start_level)
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87 local levels = {};
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88 for level = start_level, math.huge do
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89 local info;
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90 if thread then
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91 info = debug.getinfo(thread, level+1);
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92 else
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93 info = debug.getinfo(level+1);
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94 end
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95 if not info then break; end
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96
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97 levels[(level-start_level)+1] = {
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98 level = level;
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99 info = info;
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100 locals = get_locals_table(level+1);
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101 upvalues = get_upvalues_table(info.func);
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102 };
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103 end
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104 return levels;
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105 end
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106
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107 function traceback(...)
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108 local ok, ret = pcall(_traceback, ...);
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109 if not ok then
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110 return "Error in error handling: "..ret;
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111 end
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112 return ret;
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113 end
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114
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115 local function build_source_boundary_marker(last_source_desc)
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116 local padding = string.rep("-", math.floor(((optimal_line_length - 6) - #last_source_desc)/2));
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117 return getstring(styles.boundary_padding, "v"..padding).." "..getstring(styles.filename, last_source_desc).." "..getstring(styles.boundary_padding, padding..(#last_source_desc%2==0 and "-v" or "v "));
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118 end
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119
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120 function _traceback(thread, message, level)
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121
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122 -- Lua manual says: debug.traceback ([thread,] [message [, level]])
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123 -- I fathom this to mean one of:
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124 -- ()
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125 -- (thread)
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126 -- (message, level)
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127 -- (thread, message, level)
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128
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129 if thread == nil then -- Defaults
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130 thread, message, level = coroutine.running(), message, level;
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131 elseif type(thread) == "string" then
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132 thread, message, level = coroutine.running(), thread, message;
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133 elseif type(thread) ~= "thread" then
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134 return nil; -- debug.traceback() does this
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135 end
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136
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137 level = level or 1;
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138
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139 message = message and (message.."\n") or "";
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140
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141 -- +3 counts for this function, and the pcall() and wrapper above us
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142 local levels = get_traceback_table(thread, level+3);
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143
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144 local last_source_desc;
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145
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146 local lines = {};
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147 for nlevel, level in ipairs(levels) do
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148 local info = level.info;
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149 local line = "...";
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150 local func_type = info.namewhat.." ";
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151 local source_desc = (info.short_src == "[C]" and "C code") or info.short_src or "Unknown";
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152 if func_type == " " then func_type = ""; end;
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153 if info.short_src == "[C]" then
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154 line = "[ C ] "..func_type.."C function "..getstring(styles.location, (info.name and ("%q"):format(info.name) or "(unknown name)"));
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155 elseif info.what == "main" then
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156 line = "[Lua] "..getstring(styles.location, info.short_src.." line "..info.currentline);
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157 else
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158 local name = info.name or " ";
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159 if name ~= " " then
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160 name = ("%q"):format(name);
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161 end
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162 if func_type == "global " or func_type == "local " then
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163 func_type = func_type.."function ";
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164 end
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165 line = "[Lua] "..getstring(styles.location, info.short_src.." line "..info.currentline).." in "..func_type..getstring(styles.funcname, name).." (defined on line "..info.linedefined..")";
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166 end
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167 if source_desc ~= last_source_desc then -- Venturing into a new source, add marker for previous
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168 last_source_desc = source_desc;
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169 table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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170 end
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171 nlevel = nlevel-1;
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172 table.insert(lines, "\t"..(nlevel==0 and ">" or " ")..getstring(styles.level_num, "("..nlevel..") ")..line);
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173 local npadding = (" "):rep(#tostring(nlevel));
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174 local locals_str = string_from_var_table(level.locals, optimal_line_length, "\t "..npadding);
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175 if locals_str then
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176 table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
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177 end
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178 local upvalues_str = string_from_var_table(level.upvalues, optimal_line_length, "\t "..npadding);
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179 if upvalues_str then
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180 table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
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181 end
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182 end
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183
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184 -- table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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185
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186 return message.."stack traceback:\n"..table.concat(lines, "\n");
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187 end
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188
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189 function use()
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190 debug.traceback = traceback;
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191 end
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192
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193 return _M;