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Testing has demonstrated that the default GC parameters are not
sufficient to prevent runaway memory growth when running under Lua 5.2
and Lua 5.3.
Setting the GC speed to 500 was tested on Lua versions 5.1->5.4 and did
not display unbounded memory growth.
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The metric subsystem of Prosody has had some shortcomings from
the perspective of the current state-of-the-art in metric
observability.
The OpenMetrics standard [0] is a formalization of the data
model (and serialization format) of the well-known and
widely-used Prometheus [1] software stack.
The previous stats subsystem of Prosody did not map well to that
format (see e.g. [2] and [3]); the key reason is that it was
trying to do too much math on its own ([2]) while lacking
first-class support for "families" of metrics ([3]) and
structured metric metadata (despite the `extra` argument to
metrics, there was no standard way of representing common things
like "tags" or "labels").
Even though OpenMetrics has grown from the Prometheus world of
monitoring, it maps well to other popular monitoring stacks
such as:
- InfluxDB (labels can be mapped to tags and fields as necessary)
- Carbon/Graphite (labels can be attached to the metric name with
dot-separation)
- StatsD (see graphite when assuming that graphite is used as
backend, which is the default)
The util.statsd module has been ported to use the OpenMetrics
model as a proof of concept. An implementation which exposes
the util.statistics backend data as Prometheus metrics is
ready for publishing in prosody-modules (most likely as
mod_openmetrics_prometheus to avoid breaking existing 0.11
deployments).
At the same time, the previous measure()-based API had one major
advantage: It is really simple and easy to use without requiring
lots of knowledge about OpenMetrics or similar concepts. For that
reason as well as compatibility with existing code, it is preserved
and may even be extended in the future.
However, code relying on the `stats-updated` event as well as
`get_stats` from `statsmanager` will break because the data
model has changed completely; in case of `stats-updated`, the
code will simply not run (as the event was renamed in order
to avoid conflicts); the `get_stats` function has been removed
completely (so it will cause a traceback when it is attempted
to be used).
Note that the measure_*_event methods have been removed from
the module API. I was unable to find any uses or documentation
and thus deemed they should not be ported. Re-implementation is
possible when necessary.
[0]: https://openmetrics.io/
[1]: https://prometheus.io/
[2]: #959
[3]: #960
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E.g. `prosodyctl shell module reload disco example.com` becomes
equivalent to `prosodyctl shell 'module:reload("disco", "example.com")`.
Won't work for every possible command, but reduces the amount of shell
quoting problems for most common commands.
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If network_settings.opportunistic_writes is enabled then this would
previously have resulted in two socket writes, and possibly two packets
being sent. This caused some issues in older versions of Gajim, which
apparently expected the stream opening in the first packet, and thus it
could not connect.
With this change and opportunistic_writes enabled, the first packet
should contain both the xml declaration and the stream open tag.
Without opportunistic_writes, there should be no observable change.
Tested with Gajim 1.1.2 (on same machine). Unsure if loopback behaves
differently than the network here.
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Fixes that luarocks defaults to installing the rock for its own runtime
version of Lua.
This only works with luarocks 3.x, it does nothing on 2.x as currently
available from Debian.
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This saves awkward fiddlery with varargs and also echoes the
signature of pcall/xpcall.
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Usage: promise.join(p1, p2, function (result1, result2)
[...]
end)
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Since there is no way to distinguish an empty such array from a
zero-length array. Dropping it seems like the least annoying thing to
do.
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Turns falsy values into nil instead of nothing, which ensures this
function always has 1 return value, or table.insert({}) complains. Would
still happen on some unexpected input, but that's actually a good thing.
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So the problem is that xmlns is not inherited when building a stanza,
and then :get_child(n, ns) with an explicit namespace does not find that
such child tags.
E.g.
local t = st.stanza("foo", { xmlns = "urn:example:bar" })
:text_tag("hello", "world");
assert(t:get_child("hello", "urn:example:bar"), "This fails");
Meanwhile, during parsing (util.xmppstream or util.xml) child tags do
get the parents xmlns when not overriding them.
Thus, in the above example, if the stanza is passed trough
`t = util.xml.parse(tostring(t))` then the assert succeeds.
This change makes it so that it leaves out the namespace argument to
:get_child when it is the same as the current/parent namespace, which
behaves the same for both built and parsed stanzas.
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Since this was the last severely duplicated code left.
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Turns out the unreachable error is reachable :D
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So extract_value() takes an XML tag and details about which part we're
interested in and returns that.
Factoring this out will help with array implementation since this will
be common behavior.
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Fixes error due to attempting to index a nil value
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This code extracts the bits from the schema that determines how the data
is to be mapped to/from XML.
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Now it gets the text, attribute or name first, then turns it into
whatever the schema wants. This should be easier to further factor out
into preparation for array support.
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Cleaner and rules out invalid combinations.
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E.g. error conditions or chat states.
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More in line with the other tests
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That whole condition stanza was shown as angry red, I think it's
something with 'enum' being a key word in Teal.
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This is a bit special in Lua as tables are not limited to string keys
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This is a bit cleaner, I think
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This may have been what got me confused about "items" being an array.
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And apparently I had mistaken this for an array
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Apparently a schema must be either an object or a boolean. Not sure
where I got this string shortcut from, but I think I will keep it as it
is very convenient.
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Upon re-reading the JSON Schema spec, I found that 'items' wasn't a
union of an array of schemas or a single schema, not sure where I got
that from.
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attribute matters
E.g. <feature var='foo'/> in XEP-0030 and some other simple
specifications.
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Useful for certain enum-like uses where the element name is the relevant
information, e.g. chat states.
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Based on the XML support in the OpenAPI specification.
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