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diff --git a/lib/prometheus/metric.ex b/lib/prometheus/metric.ex
index b5ac261..efcf8bb 100644
--- a/lib/prometheus/metric.ex
+++ b/lib/prometheus/metric.ex
@@ -1,146 +1,150 @@
defmodule Prometheus.Metric do
@moduledoc """
Prometheus metrics shortcuts.
Aliases and requires respective metric modules so they are
accessible without `Prometheus.Metric` prefix.
Allows to automatically setup metrics with
`@<type`> attributes. Metrics will be declared in
the `@on_load` callback. If the module already
has `@on_laod` callback, metrics will be declared
iff the callback returns `:ok`.
iex(1)> defmodule MyCoolModule do
...(1)> use Prometheus.Metric
...(1)>
...(1)> @counter name: :test_counter3, labels: [], help: "qwe"
...(1)> end
iex(2)> require Prometheus.Metric.Counter
Prometheus.Metric.Counter
iex(3)> Prometheus.Metric.Counter.value(:test_counter3)
0
"""
@metrics [:counter, :gauge, :boolean, :summary, :histogram]
defmacro __using__(_opts) do
module_name = __CALLER__.module
quote do
alias Prometheus.Metric.{Counter,Gauge,Histogram,Summary,Boolean}
require Prometheus.Metric.{Counter,Gauge,Histogram,Summary,Boolean}
unquote_splicing(
for metric <- @metrics do
quote do
Module.register_attribute unquote(module_name), unquote(metric), accumulate: true
end
end)
@before_compile unquote(__MODULE__)
end
end
defmacro __before_compile__(env) do
quote do
def __declare_prometheus_metrics__() do
- unquote_splicing(
- for metric <- @metrics do
- declarations = Module.get_attribute(env.module, metric)
- Module.delete_attribute(env.module, metric)
- quote do
- unquote_splicing(
- for params <- declarations do
- emit_create_metric(metric, params)
- end)
- :ok
- end
- end)
+ if List.keymember?(Application.started_applications(), :prometheus, 0) do
+ unquote_splicing(
+ for metric <- @metrics do
+ declarations = Module.get_attribute(env.module, metric)
+ Module.delete_attribute(env.module, metric)
+ quote do
+ unquote_splicing(
+ for params <- declarations do
+ emit_create_metric(metric, params)
+ end)
+ :ok
+ end
+ end)
+ else
+ :ok
+ end
end
unquote(
case get_on_load_attribute(env.module) do
nil ->
quote do
@on_load :__declare_prometheus_metrics__
end
on_load ->
Module.delete_attribute(env.module, :on_load)
Module.put_attribute(env.module, :on_load, :__prometheus_on_load_override__)
quote do
def __prometheus_on_load_override__() do
case unquote(on_load)() do
:ok -> __declare_prometheus_metrics__()
result -> result
end
end
end
end)
end
end
defp get_on_load_attribute(module) do
case Module.get_attribute(module, :on_load) do
[] ->
nil
nil ->
nil
atom when is_atom(atom) ->
atom
{atom, 0} when is_atom(atom) ->
atom
[{atom, 0}] when is_atom(atom) ->
atom
other ->
raise ArgumentError,
"expected the @on_load attribute to be an atom or a " <>
"{atom, 0} tuple, got: #{inspect(other)}"
end
end
defp emit_create_metric(:counter, params) do
quote do
Prometheus.Metric.Counter.declare(unquote(params))
end
end
defp emit_create_metric(:gauge, params) do
quote do
Prometheus.Metric.Gauge.declare(unquote(params))
end
end
defp emit_create_metric(:boolean, params) do
quote do
Prometheus.Metric.Boolean.declare(unquote(params))
end
end
defp emit_create_metric(:summary, params) do
quote do
Prometheus.Metric.Summary.declare(unquote(params))
end
end
defp emit_create_metric(:histogram, params) do
quote do
Prometheus.Metric.Histogram.declare(unquote(params))
end
end
defmacro ct_parsable_spec?(spec) do
quote do
is_list(unquote(spec)) or is_atom(unquote(spec))
end
end
def parse_spec(spec) when is_list(spec) do
registry = Keyword.get(spec, :registry, :default)
name = Keyword.fetch!(spec, :name)
labels = Keyword.get(spec, :labels, [])
{registry, name, labels}
end
def parse_spec(spec) when is_atom(spec) do
{:default, spec, []}
end
end

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