prosody
5eaf77114fdb
tools/modtrace.lua

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tools/modtrace.lua @ 12590:5eaf77114fdb

compat: Use table.pack (there since Lua 5.2) over our util.table Added in d278a770eddc avoid having to deal with its absence in Lua 5.1. No longer needed when Lua 5.1 support is dropped.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 19:15:24 +0200
parent 12589:39ae08180c81
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
11195
c4cb536b67b5 tools.modtrace: Library for tracing/debugging Lua module and method calls
Matthew Wild <mwild1@gmail.com>
parents:
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1 -- Trace module calls and method calls on created objects
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2 --
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3 -- Very rough and for debugging purposes only. It makes many
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4 -- assumptions and there are many ways it could fail.
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5 --
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6 -- Example use:
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7 --
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8 -- local dbuffer = require "tools.modtrace".trace("util.dbuffer");
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9 --
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10
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11 local t_pack = table.pack;
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12 local serialize = require "util.serialization".serialize;
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13 local unpack = table.unpack;
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14 local set = require "util.set";
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15
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16 local serialize_cfg = {
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17 preset = "oneline";
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18 freeze = true;
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19 fatal = false;
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20 fallback = function (v) return "<"..tostring(v)..">" end;
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21 };
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22
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23 local function stringify_value(v)
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24 if type(v) == "string" and #v > 20 then
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25 return ("<string(%d)>"):format(#v);
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26 elseif type(v) == "function" then
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27 return tostring(v);
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28 end
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29 return serialize(v, serialize_cfg);
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30 end
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31
c4cb536b67b5 tools.modtrace: Library for tracing/debugging Lua module and method calls
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32 local function stringify_params(...)
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33 local n = select("#", ...);
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34 local r = {};
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35 for i = 1, n do
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36 table.insert(r, stringify_value((select(i, ...))));
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37 end
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38 return table.concat(r, ", ");
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39 end
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40
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41 local function stringify_result(ret)
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42 local r = {};
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43 for i = 1, ret.n do
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44 table.insert(r, stringify_value(ret[i]));
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45 end
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46 return table.concat(r, ", ");
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47 end
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48
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49 local function stringify_call(method_name, ...)
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50 return ("%s(%s)"):format(method_name, stringify_params(...));
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51 end
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52
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53 local function wrap_method(original_obj, original_method, method_name)
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54 method_name = ("<%s>:%s"):format(getmetatable(original_obj).__name or "object", method_name);
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55 return function (new_obj_self, ...)
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56 local opts = new_obj_self._modtrace_opts;
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57 local f = opts.output or io.stderr;
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58 f:write(stringify_call(method_name, ...));
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59 local ret = t_pack(original_method(original_obj, ...));
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60 if ret.n > 0 then
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61 f:write(" = ", stringify_result(ret), "\n");
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62 else
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63 f:write("\n");
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64 end
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65 return unpack(ret, 1, ret.n);
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66 end;
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67 end
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68
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69 local function wrap_function(original_function, function_name, opts)
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70 local f = opts.output or io.stderr;
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71 return function (...)
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72 f:write(stringify_call(function_name, ...));
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73 local ret = t_pack(original_function(...));
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74 if ret.n > 0 then
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75 f:write(" = ", stringify_result(ret), "\n");
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76 else
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77 f:write("\n");
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78 end
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79 return unpack(ret, 1, ret.n);
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80 end;
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81 end
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82
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83 local function wrap_metamethod(name, method)
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84 if name == "__index" then
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85 return function (new_obj, k)
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86 local original_method;
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87 if type(method) == "table" then
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88 original_method = new_obj._modtrace_original_obj[k];
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89 else
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90 original_method = method(new_obj._modtrace_original_obj, k);
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91 end
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92 if original_method == nil then
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93 return nil;
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94 end
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95 return wrap_method(new_obj._modtrace_original_obj, original_method, k);
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96 end;
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97 end
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98 return function (new_obj, ...)
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99 return method(new_obj._modtrace_original_obj, ...);
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100 end;
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101 end
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102
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103 local function wrap_mt(original_mt)
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104 local new_mt = {};
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105 for k, v in pairs(original_mt) do
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106 new_mt[k] = wrap_metamethod(k, v);
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107 end
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108 return new_mt;
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109 end
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110
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111 local function wrap_obj(original_obj, opts)
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112 local new_mt = wrap_mt(getmetatable(original_obj));
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113 return setmetatable({_modtrace_original_obj = original_obj, _modtrace_opts = opts}, new_mt);
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114 end
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115
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116 local function wrap_new(original_new, function_name, opts)
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117 local f = opts.output or io.stderr;
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118 return function (...)
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119 f:write(stringify_call(function_name, ...));
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120 local ret = t_pack(original_new(...));
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121 local obj = ret[1];
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122
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123 if ret.n == 1 and type(ret[1]) == "table" then
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124 f:write(" = <", getmetatable(ret[1]).__name or "object", ">", "\n");
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125 elseif ret.n > 0 then
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126 f:write(" = ", stringify_result(ret), "\n");
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127 else
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128 f:write("\n");
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129 end
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130
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131 if obj then
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132 ret[1] = wrap_obj(obj, opts);
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133 end
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134 return unpack(ret, 1, ret.n);
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135 end;
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136 end
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137
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138 local function trace(module, opts)
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139 if type(module) == "string" then
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140 module = require(module);
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141 end
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142 opts = opts or {};
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143 local new_methods = set.new(opts.new_methods or {"new"});
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144 local fake_module = setmetatable({}, {
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145 __index = function (_, k)
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146 if new_methods:contains(k) then
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147 return wrap_new(module[k], k, opts);
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148 else
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149 return wrap_function(module[k], k, opts);
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150 end
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151 end;
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152 });
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153 return fake_module;
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154 end
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155
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156 return {
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157 wrap = trace;
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158 trace = trace;
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159 }