prosody
33b6fbdcec88
util/error.lua

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util/error.lua @ 11090:33b6fbdcec88

util.error: Default error originator to stanza sender The @by attribute is primarily useful for errors caused by intermediate entities.
author Kim Alvefur <zash@zash.se>
date Sat, 26 Sep 2020 18:14:10 +0200
parent 11089:35d2260644d9
child 11091:4b4b5188492f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local id = require "util.id";
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2
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3 -- Library configuration (see configure())
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4 local auto_inject_traceback = false;
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5 local display_tracebacks = false;
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6
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7
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8 local error_mt = { __name = "error" };
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9
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10 function error_mt:__tostring()
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11 if display_tracebacks and self.context.traceback then
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12 return ("error<%s:%s:%s:%s>"):format(self.type, self.condition, self.text or "", self.context.traceback);
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13 end
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14 return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
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15 end
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16
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17 local function is_err(e)
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18 return getmetatable(e) == error_mt;
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19 end
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20
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21 local function configure(opt)
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22 if opt.display_tracebacks ~= nil then
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23 display_tracebacks = opt.display_tracebacks;
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24 end
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25 if opt.auto_inject_traceback ~= nil then
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26 auto_inject_traceback = opt.auto_inject_traceback;
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27 end
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28 end
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29
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30 -- Do we want any more well-known fields?
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31 -- Or could we just copy all fields from `e`?
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32 -- Sometimes you want variable details in the `text`, how to handle that?
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33 -- Translations?
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34 -- Should the `type` be restricted to the stanza error types or free-form?
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35 -- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.
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36
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37 local function new(e, context, registry, source)
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38 local template = registry and registry[e];
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39 if not template then
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40 if type(e) == "table" then
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41 template = {
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42 code = e.code;
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43 type = e.type;
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44 condition = e.condition;
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45 text = e.text;
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46 extra = e.extra;
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47 };
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48 else
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49 template = {};
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50 end
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51 end
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52 context = context or {};
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53
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54 if auto_inject_traceback then
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55 context.traceback = debug.traceback("error stack", 2);
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56 end
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57
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58 local error_instance = setmetatable({
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59 instance_id = id.short();
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60
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61 type = template.type or "cancel";
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62 condition = template.condition or "undefined-condition";
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63 text = template.text;
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64 code = template.code;
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65 extra = template.extra;
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66
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67 context = context;
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68 source = source;
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69 }, error_mt);
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70
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71 return error_instance;
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72 end
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73
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74 local function init(source, registry)
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75 return {
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76 new = function (e, context)
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77 return new(e, context, registry, source);
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78 end;
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79 };
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80 end
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81
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82 local function coerce(ok, err, ...)
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83 if ok or is_err(err) then
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84 return ok, err, ...;
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85 end
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86
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87 local new_err = new({
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88 type = "cancel", condition = "undefined-condition"
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89 }, { wrapped_error = err });
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90
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91 return ok, new_err, ...;
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92 end
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93
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94 local function from_stanza(stanza, context)
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95 local error_type, condition, text = stanza:get_error();
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96 local error_tag = stanza:get_child("error");
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97 context = context or {};
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98 context.stanza = stanza;
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99 context.by = error_tag.attr.by or stanza.attr.from;
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100
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101 return setmetatable({
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102 type = error_type or "cancel";
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103 condition = condition or "undefined-condition";
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104 text = text;
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105
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106 context = context;
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107
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108 }, error_mt);
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109 end
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110
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111 return {
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112 new = new;
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113 init = init;
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114 coerce = coerce;
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115 is_err = is_err;
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116 from_stanza = from_stanza;
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117 configure = configure;
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118 }