Software /
code /
prosody
Changeset
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 (2018-12-30) |
parents | 9745:0dbb285f903e |
children | 9747:c8240f931a68 |
files | util/error.lua |
diffstat | 1 files changed, 40 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/util/error.lua Sun Dec 30 12:55:58 2018 +0000 @@ -0,0 +1,40 @@ +local error_mt = { __name = "error" }; + +function error_mt:__tostring() + return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text); +end + +local function is_err(e) + return getmetatable(e) == error_mt; +end + +local function new(e, context, registry) + local template = (registry and registry[e]) or e or {}; + return setmetatable({ + type = template.type or "cancel"; + condition = template.condition or "undefined-condition"; + text = template.text; + + context = context or template.context or { _error_id = e }; + }, error_mt); +end + +local function coerce(ok, err, ...) + if ok or is_err(err) then + return ok, err, ...; + end + + local new_err = setmetatable({ + native = err; + + type = "cancel"; + condition = "undefined-condition"; + }, error_mt); + return ok, new_err, ...; +end + +return { + new = new; + coerce = coerce; + is_err = is_err; +}