prosody
ee4f2296e7df
tools/modtrace.lua

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tools/modtrace.lua @ 11451:ee4f2296e7df

util.datamapper: Add references with notes
author Kim Alvefur <zash@zash.se>
date Wed, 10 Mar 2021 00:19:38 +0100
parent 11197:50f182931bdd
child 12589:39ae08180c81
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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c4cb536b67b5 tools.modtrace: Library for tracing/debugging Lua module and method calls
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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 = require "util.table".pack;
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12 local serialize = require "util.serialization".serialize;
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13 local unpack = table.unpack or unpack; --luacheck: ignore 113
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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
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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 }