File

util/error.lua @ 10851:6cf16abd0976

net.server_select: Ensure onconnect is always called before onincoming This changes the code to call onconnect when the first data is sucessfully read or written, instead of simply when the socket first becomes writable. A writable socket can mean a connection error, and if the client already sent some data it may get passed to onincoming before processing writable sockets. This fixes the issue.
author Matthew Wild <mwild1@gmail.com>
date Mon, 01 Jun 2020 13:38:47 +0100
parent 10501:e8186aba1583
child 11050:51be24b16e8a
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line source

local error_mt = { __name = "error" };

function error_mt:__tostring()
	return ("error<%s:%s:%s>"):format(self.type, self.condition, self.text or "");
end

local function is_err(e)
	return getmetatable(e) == error_mt;
end

-- Do we want any more well-known fields?
-- Or could we just copy all fields from `e`?
-- Sometimes you want variable details in the `text`, how to handle that?
-- Translations?
-- Should the `type` be restricted to the stanza error types or free-form?
-- What to set `type` to for stream errors or SASL errors? Those don't have a 'type' attr.

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;
		code = template.code;

		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

local function from_stanza(stanza, context)
	local error_type, condition, text = stanza:get_error();
	return setmetatable({
		type = error_type or "cancel";
		condition = condition or "undefined-condition";
		text = text;

		context = context or { stanza = stanza };
	}, error_mt);
end

return {
	new = new;
	coerce = coerce;
	is_err = is_err;
	from_stanza = from_stanza;
}