prosody
4d3549e64489
util/error.lua

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util/error.lua @ 10507:4d3549e64489

mod_admin_telnet: Refactor internal function for listing hosts Splits out a function that doesn't deal with modules for reuse elsewhere
author Kim Alvefur <zash@zash.se>
date Sun, 15 Dec 2019 22:07:24 +0100
parent 10501:e8186aba1583
child 11050:51be24b16e8a
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1 local error_mt = { __name = "error" };
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2
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3 function error_mt:__tostring()
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4 return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
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5 end
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6
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7 local function is_err(e)
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8 return getmetatable(e) == error_mt;
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9 end
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10
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11 -- Do we want any more well-known fields?
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12 -- Or could we just copy all fields from `e`?
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13 -- Sometimes you want variable details in the `text`, how to handle that?
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14 -- Translations?
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15 -- Should the `type` be restricted to the stanza error types or free-form?
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16 -- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.
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17
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18 local function new(e, context, registry)
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19 local template = (registry and registry[e]) or e or {};
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20 return setmetatable({
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21 type = template.type or "cancel";
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22 condition = template.condition or "undefined-condition";
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23 text = template.text;
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24 code = template.code;
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25
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26 context = context or template.context or { _error_id = e };
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27 }, error_mt);
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28 end
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29
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30 local function coerce(ok, err, ...)
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31 if ok or is_err(err) then
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32 return ok, err, ...;
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33 end
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34
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35 local new_err = setmetatable({
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36 native = err;
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37
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38 type = "cancel";
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39 condition = "undefined-condition";
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40 }, error_mt);
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41 return ok, new_err, ...;
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42 end
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43
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44 local function from_stanza(stanza, context)
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45 local error_type, condition, text = stanza:get_error();
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46 return setmetatable({
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47 type = error_type or "cancel";
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48 condition = condition or "undefined-condition";
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49 text = text;
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50
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51 context = context or { stanza = stanza };
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52 }, error_mt);
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53 end
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54
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55 return {
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56 new = new;
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57 coerce = coerce;
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58 is_err = is_err;
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59 from_stanza = from_stanza;
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60 }