prosody
494577d883ff
util/error.lua

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util/error.lua @ 12591:494577d883ff

util.table: Fix inaccurate comment Probably a duplicate of the comment next to Lmove, recorded by mistake Lpack can probably be removed at some point in the near future once we are confident it is not used anywhere.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 20:02:10 +0200
parent 11224:8143fd2f138b
child 12975:d10957394a3c
child 13078:6da83deb8d7f
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 local util_debug; -- only imported on-demand
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4
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5 -- Library configuration (see configure())
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6 local auto_inject_traceback = false;
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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 return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
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12 end
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13
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14 local function is_error(e)
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15 return getmetatable(e) == error_mt;
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16 end
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17
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18 local function configure(opt)
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19 if opt.auto_inject_traceback ~= nil then
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20 auto_inject_traceback = opt.auto_inject_traceback;
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21 if auto_inject_traceback then
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22 util_debug = require "util.debug";
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23 end
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24 end
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25 end
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26
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27 -- Do we want any more well-known fields?
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28 -- Or could we just copy all fields from `e`?
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29 -- Sometimes you want variable details in the `text`, how to handle that?
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30 -- Translations?
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31 -- Should the `type` be restricted to the stanza error types or free-form?
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32 -- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.
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33
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34 local function new(e, context, registry, source)
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35 if is_error(e) then return e; end
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36 local template = registry and registry[e];
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37 if not template then
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38 if type(e) == "table" then
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39 template = {
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40 code = e.code;
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41 type = e.type;
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42 condition = e.condition;
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43 text = e.text;
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44 extra = e.extra;
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45 };
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46 else
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47 template = {};
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48 end
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49 end
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50 context = context or {};
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51
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52 if auto_inject_traceback then
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53 context.traceback = util_debug.get_traceback_table(nil, 2);
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54 end
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55
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56 local error_instance = setmetatable({
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57 instance_id = id.short();
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58
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59 type = template.type or "cancel";
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60 condition = template.condition or "undefined-condition";
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61 text = template.text;
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62 code = template.code;
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63 extra = template.extra;
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64
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65 context = context;
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66 source = source;
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67 }, error_mt);
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68
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69 return error_instance;
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70 end
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71
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72 -- compact --> normal form
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73 local function expand_registry(namespace, registry)
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74 local mapped = {}
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75 for err,template in pairs(registry) do
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76 local e = {
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77 type = template[1];
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78 condition = template[2];
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79 text = template[3];
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80 };
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81 if namespace and template[4] then
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82 e.extra = { namespace = namespace, condition = template[4] };
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83 end
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84 mapped[err] = e;
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85 end
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86 return mapped;
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87 end
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88
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89 local function init(source, namespace, registry)
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90 if type(namespace) == "table" then
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91 -- registry can be given as second argument if namespace is not used
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92 registry, namespace = namespace, nil;
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93 end
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94 local _, protoerr = next(registry, nil);
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95 if protoerr and type(next(protoerr)) == "number" then
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96 registry = expand_registry(namespace, registry);
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97 end
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98
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99 local function wrap(e, context)
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100 if is_error(e) then
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101 return e;
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102 end
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103 local err = new(registry[e] or {
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104 type = "cancel", condition = "undefined-condition"
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105 }, context, registry, source);
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106 err.context.wrapped_error = e;
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107 return err;
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108 end
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109
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110 return {
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111 source = source;
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112 registry = registry;
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113 new = function (e, context)
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114 return new(e, context, registry, source);
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115 end;
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116 coerce = function (ok, err, ...)
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117 if ok then
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118 return ok, err, ...;
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119 end
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120 return nil, wrap(err);
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121 end;
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122 wrap = wrap;
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123 is_error = is_error;
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124 };
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125 end
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126
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127 local function coerce(ok, err, ...)
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128 if ok or is_error(err) then
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129 return ok, err, ...;
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130 end
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131
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132 local new_err = new({
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133 type = "cancel", condition = "undefined-condition"
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134 }, { wrapped_error = err });
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135
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136 return ok, new_err, ...;
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137 end
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138
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03fdf41fd948 util.error: Pass converted stanza errors throguh new()
Kim Alvefur <zash@zash.se>
parents: 11092
diff changeset
139 local function from_stanza(stanza, context, source)
11092
bd13aa89262d util.error: Collect Application-Specific Conditions from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11091
diff changeset
140 local error_type, condition, text, extra_tag = stanza:get_error();
11089
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
141 local error_tag = stanza:get_child("error");
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
142 context = context or {};
35d2260644d9 util.error: Extract error originator from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11081
diff changeset
143 context.stanza = stanza;
11090
33b6fbdcec88 util.error: Default error originator to stanza sender
Kim Alvefur <zash@zash.se>
parents: 11089
diff changeset
144 context.by = error_tag.attr.by or stanza.attr.from;
33b6fbdcec88 util.error: Default error originator to stanza sender
Kim Alvefur <zash@zash.se>
parents: 11089
diff changeset
145
11095
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
146 local uri;
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
147 if condition == "gone" or condition == "redirect" then
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
148 uri = error_tag:get_child_text(condition, "urn:ietf:params:xml:ns:xmpp-stanzas");
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
149 end
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
150
11094
03fdf41fd948 util.error: Pass converted stanza errors throguh new()
Kim Alvefur <zash@zash.se>
parents: 11092
diff changeset
151 return new({
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
152 type = error_type or "cancel";
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
153 condition = condition or "undefined-condition";
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
154 text = text;
11095
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
155 extra = (extra_tag or uri) and {
1ea3574b19c8 util.error: Turns out <gone> wasn't alone, there's also <redirect>
Kim Alvefur <zash@zash.se>
parents: 11094
diff changeset
156 uri = uri;
11092
bd13aa89262d util.error: Collect Application-Specific Conditions from stanza errors
Kim Alvefur <zash@zash.se>
parents: 11091
diff changeset
157 tag = extra_tag;
11091
4b4b5188492f util.error: Add special case handling of <gone> with an URI
Kim Alvefur <zash@zash.se>
parents: 11090
diff changeset
158 } or nil;
11094
03fdf41fd948 util.error: Pass converted stanza errors throguh new()
Kim Alvefur <zash@zash.se>
parents: 11092
diff changeset
159 }, context, nil, source);
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
160 end
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
161
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
162 return {
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
163 new = new;
11054
ad07152d7bde util.error: Add a wrapper for common parameters
Kim Alvefur <zash@zash.se>
parents: 11053
diff changeset
164 init = init;
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
165 coerce = coerce;
11222
4b39691a274e util.error: rename is_err() -> is_error()
Matthew Wild <mwild1@gmail.com>
parents: 11221
diff changeset
166 is_error = is_error;
4b39691a274e util.error: rename is_err() -> is_error()
Matthew Wild <mwild1@gmail.com>
parents: 11221
diff changeset
167 is_err = is_error; -- COMPAT w/ older 0.12 trunk
9749
9361bd1b9c9b util.error: Add a function for creating an error object from an error stanza
Kim Alvefur <zash@zash.se>
parents: 9746
diff changeset
168 from_stanza = from_stanza;
11050
51be24b16e8a util.error: Allow optional tracebacks to be injected on errors
Matthew Wild <mwild1@gmail.com>
parents: 10501
diff changeset
169 configure = configure;
9746
848fd204708c util.error: Add new util library for structured errors
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
170 }