prosody
0b0a42542456
util/error.lua

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util/error.lua @ 11056:0b0a42542456

util.jid: Fix special escaping of '\' per XEP-0106 From XEP-0106 §2. Requirements: > in certain circumstances, the escaping character itself ("\") might > also be escaped Later in §4.2 Address Transformation Algorithm it is stated that the backslash would only be escaped if it forms an escape sequence. Thus '\foo' is unaltered but '\20' must be escaped into '\5c20'. Thanks to lovetox and jonas’ for brining up.
author Kim Alvefur <zash@zash.se>
date Fri, 28 Aug 2020 18:44:02 +0200
parent 11054:ad07152d7bde
child 11075:d8fad2b48b05
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1
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2 -- Library configuration (see configure())
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3 local auto_inject_traceback = false;
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4 local display_tracebacks = false;
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7 local error_mt = { __name = "error" };
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8
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9 function error_mt:__tostring()
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10 if display_tracebacks and self.context.traceback then
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11 return ("error<%s:%s:%s:%s>"):format(self.type, self.condition, self.text or "", self.context.traceback);
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12 end
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13 return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
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14 end
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15
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16 local function is_err(e)
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17 return getmetatable(e) == error_mt;
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18 end
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19
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20 local function configure(opt)
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21 if opt.display_tracebacks ~= nil then
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22 display_tracebacks = opt.display_tracebacks;
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23 end
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24 if opt.auto_inject_traceback ~= nil then
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25 auto_inject_traceback = opt.auto_inject_traceback;
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26 end
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27 end
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28
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29 -- Do we want any more well-known fields?
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30 -- Or could we just copy all fields from `e`?
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31 -- Sometimes you want variable details in the `text`, how to handle that?
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32 -- Translations?
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33 -- Should the `type` be restricted to the stanza error types or free-form?
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34 -- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.
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35
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36 local function new(e, context, registry, source)
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37 local template = (registry and registry[e]) or e or {};
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38 context = context or template.context or { _error_id = e };
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39
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40 if auto_inject_traceback then
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41 context.traceback = debug.traceback("error stack", 2);
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42 end
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43
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44 return setmetatable({
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45 type = template.type or "cancel";
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46 condition = template.condition or "undefined-condition";
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47 text = template.text;
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48 code = template.code;
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50 context = context or template.context or { _error_id = e };
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51 source = source;
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52 }, error_mt);
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53 end
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54
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55 local function init(source, registry)
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56 return function (e, context)
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57 return new(e, context, registry, source);
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58 end
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59 end
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60
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61 local function coerce(ok, err, ...)
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62 if ok or is_err(err) then
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63 return ok, err, ...;
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64 end
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65
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66 local new_err = setmetatable({
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67 native = err;
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68
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69 type = "cancel";
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70 condition = "undefined-condition";
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71 }, error_mt);
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72 return ok, new_err, ...;
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73 end
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74
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75 local function from_stanza(stanza, context)
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76 local error_type, condition, text = stanza:get_error();
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77 return setmetatable({
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78 type = error_type or "cancel";
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79 condition = condition or "undefined-condition";
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80 text = text;
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81
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82 context = context or { stanza = stanza };
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83 }, error_mt);
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84 end
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85
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86 return {
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87 new = new;
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88 init = init;
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89 coerce = coerce;
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90 is_err = is_err;
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91 from_stanza = from_stanza;
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92 configure = configure;
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93 }