prosody
848fd204708c
util/error.lua

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util/error.lua @ 9746:848fd204708c

util.error: Add new util library for structured errors
author Matthew Wild <mwild1@gmail.com>
date Sun, 30 Dec 2018 12:55:58 +0000
child 9749:9361bd1b9c9b
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9746
848fd204708c util.error: Add new util library for structured errors
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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);
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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 local function new(e, context, registry)
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12 local template = (registry and registry[e]) or e or {};
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13 return setmetatable({
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14 type = template.type or "cancel";
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15 condition = template.condition or "undefined-condition";
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16 text = template.text;
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17
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18 context = context or template.context or { _error_id = e };
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19 }, error_mt);
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20 end
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21
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22 local function coerce(ok, err, ...)
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23 if ok or is_err(err) then
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24 return ok, err, ...;
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25 end
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26
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27 local new_err = setmetatable({
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28 native = err;
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29
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30 type = "cancel";
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31 condition = "undefined-condition";
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32 }, error_mt);
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33 return ok, new_err, ...;
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34 end
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35
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36 return {
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37 new = new;
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38 coerce = coerce;
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39 is_err = is_err;
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40 }