prosody
5d7d9a60bc7f
util/debug.lua

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util/debug.lua @ 4412:5d7d9a60bc7f

util.debug: Experimental new library for producing more extensive debug tracebacks
author Matthew Wild <mwild1@gmail.com>
date Thu, 03 Nov 2011 12:41:21 +0000
child 4418:70b5e533325d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
4412
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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
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11 local function get_locals_table(level)
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12 local locals = {};
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13 for local_num = 1, math.huge do
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14 local name, value = debug.getlocal(level, local_num);
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15 if not name then break; end
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16 table.insert(locals, { name = name, value = value });
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17 end
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18 return locals;
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19 end
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20
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21 local function get_upvalues_table(func)
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22 local upvalues = {};
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23 for upvalue_num = 1, math.huge do
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24 local name, value = debug.getupvalue(func, upvalue_num);
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25 if not name then break; end
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26 table.insert(upvalues, { name = name, value = value });
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27 end
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28 return upvalues;
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29 end
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30
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31 local function string_from_var_table(var_table, max_line_len, indent_str)
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32 local var_string = {};
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33 local col_pos = 0;
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34 max_line_len = max_line_len or math.huge;
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35 indent_str = "\n"..(indent_str or "");
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36 for _, var in ipairs(var_table) do
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37 local name, value = var.name, var.value;
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38 if name:sub(1,1) ~= "(" then
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39 if type(value) == "string" then
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40 if censored_names[name:match("%a+$")] then
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41 value = "<hidden>";
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42 else
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43 value = ("%q"):format(value);
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44 end
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45 else
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46 value = tostring(value);
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47 end
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48 if #value > max_line_len then
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49 value = value:sub(1, max_line_len-3).."…";
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50 end
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51 local str = ("%s = %s"):format(name, tostring(value));
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52 col_pos = col_pos + #str;
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53 if col_pos > max_line_len then
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54 table.insert(var_string, indent_str);
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55 col_pos = 0;
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56 end
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57 table.insert(var_string, str);
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58 end
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59 end
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60 if #var_string == 0 then
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61 return nil;
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62 else
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63 return "{ "..table.concat(var_string, ", "):gsub(indent_str..", ", indent_str).." }";
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64 end
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65 end
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66
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67 function get_traceback_table(thread, start_level)
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68 local levels = {};
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69 for level = start_level, math.huge do
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70 local info;
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71 if thread then
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72 info = debug.getinfo(thread, level);
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73 else
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74 info = debug.getinfo(level);
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75 end
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76 if not info then break; end
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77
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78 levels[(level-start_level)+1] = {
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79 level = level;
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80 info = info;
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81 locals = get_locals_table(level);
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82 upvalues = get_upvalues_table(info.func);
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83 };
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84 end
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85 return levels;
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86 end
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87
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88 function debug.traceback(thread, message, level)
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89 if type(thread) ~= "thread" then
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90 thread, message, level = coroutine.running(), thread, message;
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91 end
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92 if level and type(message) ~= "string" then
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93 return nil, "invalid message";
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94 elseif not level then
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95 level = message or 2;
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96 end
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97
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98 message = message and (message.."\n") or "";
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99
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100 local levels = get_traceback_table(thread, level+2);
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101
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102 local lines = {};
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103 for nlevel, level in ipairs(levels) do
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104 local info = level.info;
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105 local line = "...";
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106 local func_type = info.namewhat.." ";
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107 if func_type == " " then func_type = ""; end;
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108 if info.short_src == "[C]" then
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109 line = "[ C ] "..func_type.."C function "..(info.name and ("%q"):format(info.name) or "(unknown name)")
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110 elseif info.what == "main" then
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111 line = "[Lua] "..info.short_src.." line "..info.currentline;
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112 else
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113 local name = info.name or " ";
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114 if name ~= " " then
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115 name = ("%q"):format(name);
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116 end
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117 if func_type == "global " or func_type == "local " then
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118 func_type = func_type.."function ";
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119 end
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120 line = "[Lua] "..info.short_src.." line "..info.currentline.." in "..func_type..name.." defined on line "..info.linedefined;
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121 end
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122 nlevel = nlevel-1;
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123 table.insert(lines, "\t"..(nlevel==0 and ">" or " ").."("..nlevel..") "..line);
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124 local npadding = (" "):rep(#tostring(nlevel));
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125 local locals_str = string_from_var_table(level.locals, 65, "\t "..npadding);
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126 if locals_str then
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127 table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
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128 end
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129 local upvalues_str = string_from_var_table(level.upvalues, 65, "\t "..npadding);
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130 if upvalues_str then
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131 table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
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132 end
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133 end
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134 return message.."stack traceback:\n"..table.concat(lines, "\n");
5d7d9a60bc7f util.debug: Experimental new library for producing more extensive debug tracebacks
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
135 end