prosody
f69b3e39e0c1
util/debug.lua

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util/debug.lua @ 8918:f69b3e39e0c1

mod_bosh: Add extra debug logging to help with #1134
author Kim Alvefur <zash@zash.se>
date Tue, 15 May 2018 01:22:35 +0200
parent 8382:e5d00bf4a4d5
child 11177:37dc2a6144d1
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 --
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5 -- luacheck: ignore 122/debug
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6
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7 local censored_names = {
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8 password = true;
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9 passwd = true;
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10 pass = true;
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11 pwd = true;
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12 };
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13 local optimal_line_length = 65;
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14
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15 local termcolours = require "util.termcolours";
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16 local getstring = termcolours.getstring;
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17 local styles;
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18 do
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19 local _ = termcolours.getstyle;
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20 styles = {
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21 boundary_padding = _("bright");
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22 filename = _("bright", "blue");
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23 level_num = _("green");
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24 funcname = _("yellow");
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25 location = _("yellow");
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26 };
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27 end
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28
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29 local function get_locals_table(thread, level)
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30 local locals = {};
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31 for local_num = 1, math.huge do
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32 local name, value;
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33 if thread then
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34 name, value = debug.getlocal(thread, level, local_num);
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35 else
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36 name, value = debug.getlocal(level+1, local_num);
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37 end
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38 if not name then break; end
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39 table.insert(locals, { name = name, value = value });
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40 end
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41 return locals;
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42 end
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43
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44 local function get_upvalues_table(func)
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45 local upvalues = {};
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46 if func then
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47 for upvalue_num = 1, math.huge do
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48 local name, value = debug.getupvalue(func, upvalue_num);
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49 if not name then break; end
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50 if name == "" then name = ("[%d]"):format(upvalue_num); end
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51 table.insert(upvalues, { name = name, value = value });
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52 end
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53 end
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54 return upvalues;
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55 end
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56
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57 local function string_from_var_table(var_table, max_line_len, indent_str)
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58 local var_string = {};
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59 local col_pos = 0;
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60 max_line_len = max_line_len or math.huge;
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61 indent_str = "\n"..(indent_str or "");
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62 for _, var in ipairs(var_table) do
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63 local name, value = var.name, var.value;
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64 if name:sub(1,1) ~= "(" then
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65 if type(value) == "string" then
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66 if censored_names[name:match("%a+$")] then
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67 value = "<hidden>";
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68 else
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69 value = ("%q"):format(value);
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70 end
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71 else
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72 value = tostring(value);
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73 end
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74 if #value > max_line_len then
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75 value = value:sub(1, max_line_len-3).."…";
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76 end
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77 local str = ("%s = %s"):format(name, tostring(value));
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78 col_pos = col_pos + #str;
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79 if col_pos > max_line_len then
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80 table.insert(var_string, indent_str);
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81 col_pos = 0;
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82 end
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83 table.insert(var_string, str);
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84 end
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85 end
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86 if #var_string == 0 then
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87 return nil;
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88 else
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89 return "{ "..table.concat(var_string, ", "):gsub(indent_str..", ", indent_str).." }";
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90 end
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91 end
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92
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93 local function get_traceback_table(thread, start_level)
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94 local levels = {};
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95 for level = start_level, math.huge do
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96 local info;
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97 if thread then
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98 info = debug.getinfo(thread, level);
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99 else
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100 info = debug.getinfo(level+1);
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101 end
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102 if not info then break; end
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103
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104 levels[(level-start_level)+1] = {
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105 level = level;
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106 info = info;
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107 locals = get_locals_table(thread, level+(thread and 0 or 1));
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108 upvalues = get_upvalues_table(info.func);
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109 };
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110 end
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111 return levels;
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112 end
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113
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114 local function build_source_boundary_marker(last_source_desc)
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115 local padding = string.rep("-", math.floor(((optimal_line_length - 6) - #last_source_desc)/2));
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116 return getstring(styles.boundary_padding, "v"..padding).." "..
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117 getstring(styles.filename, last_source_desc).." "..
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118 getstring(styles.boundary_padding, padding..(#last_source_desc%2==0 and "-v" or "v "));
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119 end
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120
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121 local function _traceback(thread, message, level)
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122
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123 -- Lua manual says: debug.traceback ([thread,] [message [, level]])
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124 -- I fathom this to mean one of:
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125 -- ()
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126 -- (thread)
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127 -- (message, level)
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128 -- (thread, message, level)
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129
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130 if thread == nil then -- Defaults
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131 thread, message, level = coroutine.running(), message, level;
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132 elseif type(thread) == "string" then
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133 thread, message, level = coroutine.running(), thread, message;
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134 elseif type(thread) ~= "thread" then
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135 return nil; -- debug.traceback() does this
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136 end
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137
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138 level = level or 0;
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139
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140 message = message and (message.."\n") or "";
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141
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142 -- +3 counts for this function, and the pcall() and wrapper above us, the +1... I don't know.
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143 local levels = get_traceback_table(thread, level+(thread == nil and 4 or 0));
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144
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145 local last_source_desc;
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146
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147 local lines = {};
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148 for nlevel, current_level in ipairs(levels) do
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149 local info = current_level.info;
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150 local line;
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151 local func_type = info.namewhat.." ";
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152 local source_desc = (info.short_src == "[C]" and "C code") or info.short_src or "Unknown";
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153 if func_type == " " then func_type = ""; end;
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154 if info.short_src == "[C]" then
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155 line = "[ C ] "..func_type.."C function "..getstring(styles.location, (info.name and ("%q"):format(info.name) or "(unknown name)"));
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156 elseif info.what == "main" then
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157 line = "[Lua] "..getstring(styles.location, info.short_src.." line "..info.currentline);
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158 else
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159 local name = info.name or " ";
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160 if name ~= " " then
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161 name = ("%q"):format(name);
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162 end
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163 if func_type == "global " or func_type == "local " then
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164 func_type = func_type.."function ";
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165 end
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166 line = "[Lua] "..getstring(styles.location, info.short_src.." line "..
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167 info.currentline).." in "..func_type..getstring(styles.funcname, name)..
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168 " (defined on line "..info.linedefined..")";
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169 end
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170 if source_desc ~= last_source_desc then -- Venturing into a new source, add marker for previous
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171 last_source_desc = source_desc;
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172 table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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173 end
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174 nlevel = nlevel-1;
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175 table.insert(lines, "\t"..(nlevel==0 and ">" or " ")..getstring(styles.level_num, "("..nlevel..") ")..line);
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176 local npadding = (" "):rep(#tostring(nlevel));
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177 if current_level.locals then
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178 local locals_str = string_from_var_table(current_level.locals, optimal_line_length, "\t "..npadding);
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179 if locals_str then
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180 table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
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181 end
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182 end
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183 local upvalues_str = string_from_var_table(current_level.upvalues, optimal_line_length, "\t "..npadding);
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184 if upvalues_str then
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185 table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
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186 end
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187 end
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188
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189 -- table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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190
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191 return message.."stack traceback:\n"..table.concat(lines, "\n");
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192 end
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193
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194 local function traceback(...)
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195 local ok, ret = pcall(_traceback, ...);
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196 if not ok then
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197 return "Error in error handling: "..ret;
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198 end
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199 return ret;
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200 end
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201
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202 local function use()
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203 debug.traceback = traceback;
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204 end
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205
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206 return {
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207 get_locals_table = get_locals_table;
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208 get_upvalues_table = get_upvalues_table;
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209 string_from_var_table = string_from_var_table;
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210 get_traceback_table = get_traceback_table;
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211 traceback = traceback;
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212 use = use;
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213 };