prosody
d50005796a26
util/debug.lua

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util/debug.lua @ 5786:d50005796a26

util.debug: Further fix to display locals in extended tracebacks
author Matthew Wild <mwild1@gmail.com>
date Sat, 10 Aug 2013 20:40:45 +0100
parent 5785:b2d6c5f94aa5
child 5787:9a22586f67eb
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(thread, level)
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28 if not thread then
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29 level = level + 1; -- Skip this function itself
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30 end
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31 local locals = {};
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32 for local_num = 1, math.huge do
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33 local name, value = debug.getlocal(thread, level, local_num);
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34 if not name then break; end
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35 table.insert(locals, { name = name, value = value });
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36 end
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37 return locals;
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38 end
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39
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40 function get_upvalues_table(func)
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41 local upvalues = {};
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42 if func then
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43 for upvalue_num = 1, math.huge do
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44 local name, value = debug.getupvalue(func, upvalue_num);
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45 if not name then break; end
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46 table.insert(upvalues, { name = name, value = value });
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47 end
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48 end
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49 return upvalues;
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50 end
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51
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52 function string_from_var_table(var_table, max_line_len, indent_str)
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53 local var_string = {};
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54 local col_pos = 0;
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55 max_line_len = max_line_len or math.huge;
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56 indent_str = "\n"..(indent_str or "");
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57 for _, var in ipairs(var_table) do
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58 local name, value = var.name, var.value;
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59 if name:sub(1,1) ~= "(" then
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60 if type(value) == "string" then
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61 if censored_names[name:match("%a+$")] then
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62 value = "<hidden>";
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63 else
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64 value = ("%q"):format(value);
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65 end
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66 else
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67 value = tostring(value);
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68 end
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69 if #value > max_line_len then
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70 value = value:sub(1, max_line_len-3).."…";
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71 end
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72 local str = ("%s = %s"):format(name, tostring(value));
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73 col_pos = col_pos + #str;
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74 if col_pos > max_line_len then
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75 table.insert(var_string, indent_str);
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76 col_pos = 0;
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77 end
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78 table.insert(var_string, str);
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79 end
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80 end
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81 if #var_string == 0 then
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82 return nil;
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83 else
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84 return "{ "..table.concat(var_string, ", "):gsub(indent_str..", ", indent_str).." }";
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85 end
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86 end
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87
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88 function get_traceback_table(thread, start_level)
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89 local levels = {};
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90 for level = start_level, math.huge do
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91 local info;
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92 if thread then
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93 info = debug.getinfo(thread, level);
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94 else
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95 info = debug.getinfo(level+1);
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96 end
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97 if not info then break; end
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98
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99 levels[(level-start_level)+1] = {
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100 level = level;
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101 info = info;
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102 locals = get_locals_table(thread, level+(thread and 0 or 1));
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103 upvalues = get_upvalues_table(info.func);
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104 };
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105 end
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106 return levels;
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107 end
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108
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109 function traceback(...)
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110 local ok, ret = pcall(_traceback, ...);
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111 if not ok then
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112 return "Error in error handling: "..ret;
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113 end
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114 return ret;
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115 end
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116
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117 local function build_source_boundary_marker(last_source_desc)
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118 local padding = string.rep("-", math.floor(((optimal_line_length - 6) - #last_source_desc)/2));
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119 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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120 end
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121
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122 function _traceback(thread, message, level)
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123
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124 -- Lua manual says: debug.traceback ([thread,] [message [, level]])
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125 -- I fathom this to mean one of:
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126 -- ()
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127 -- (thread)
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128 -- (message, level)
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129 -- (thread, message, level)
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130
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131 if thread == nil then -- Defaults
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132 thread, message, level = coroutine.running(), message, level;
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133 elseif type(thread) == "string" then
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134 thread, message, level = coroutine.running(), thread, message;
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135 elseif type(thread) ~= "thread" then
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136 return nil; -- debug.traceback() does this
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137 end
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138
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139 level = level or 0;
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140
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141 message = message and (message.."\n") or "";
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142
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143 -- +3 counts for this function, and the pcall() and wrapper above us, the +1... I don't know.
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144 local levels = get_traceback_table(thread, level+(thread == nil and 4 or 0));
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145
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146 local last_source_desc;
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147
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148 local lines = {};
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149 for nlevel, level in ipairs(levels) do
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150 local info = level.info;
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151 local line = "...";
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152 local func_type = info.namewhat.." ";
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153 local source_desc = (info.short_src == "[C]" and "C code") or info.short_src or "Unknown";
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154 if func_type == " " then func_type = ""; end;
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155 if info.short_src == "[C]" then
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156 line = "[ C ] "..func_type.."C function "..getstring(styles.location, (info.name and ("%q"):format(info.name) or "(unknown name)"));
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157 elseif info.what == "main" then
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158 line = "[Lua] "..getstring(styles.location, info.short_src.." line "..info.currentline);
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159 else
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160 local name = info.name or " ";
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161 if name ~= " " then
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162 name = ("%q"):format(name);
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163 end
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164 if func_type == "global " or func_type == "local " then
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165 func_type = func_type.."function ";
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166 end
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167 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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168 end
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169 if source_desc ~= last_source_desc then -- Venturing into a new source, add marker for previous
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170 last_source_desc = source_desc;
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171 table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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172 end
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173 nlevel = nlevel-1;
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174 table.insert(lines, "\t"..(nlevel==0 and ">" or " ")..getstring(styles.level_num, "("..nlevel..") ")..line);
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175 local npadding = (" "):rep(#tostring(nlevel));
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176 if level.locals then
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177 local locals_str = string_from_var_table(level.locals, optimal_line_length, "\t "..npadding);
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178 if locals_str then
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179 table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
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180 end
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181 end
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182 local upvalues_str = string_from_var_table(level.upvalues, optimal_line_length, "\t "..npadding);
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183 if upvalues_str then
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184 table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
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185 end
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186 end
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187
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188 -- table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
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189
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190 return message.."stack traceback:\n"..table.concat(lines, "\n");
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191 end
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192
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193 function use()
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194 debug.traceback = traceback;
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195 end
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196
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197 return _M;