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Configurable Grafana Agent template #159

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Merged
merged 2 commits into from
Aug 11, 2022
Merged

Configurable Grafana Agent template #159

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ee34c30
Allow overriding the template file
Aug 4, 2022
0b4bc2a
Document new `template_file` config.
Aug 4, 2022
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2 changes: 2 additions & 0 deletions lib/prom_ex/config.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,8 @@ defmodule PromEx.Config do

* `:prometheus_password` - The password to the hosted Prometheus instance

* `:template_file` - The full path to the template used to render the agent config file.

* `:metrics_server` - This key contains the configuration information needed to run a standalone
HTTP server powered by Cowboy. This server provides a lightweight solution to serving up PromEx
metrics. Its configuration options are:
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17 changes: 10 additions & 7 deletions lib/prom_ex/grafana_agent/config_renderer.ex
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Expand Up @@ -9,17 +9,20 @@ defmodule PromEx.GrafanaAgent.ConfigRenderer do
"""
@spec generate_config_file(opts :: map(), config_dir :: String.t()) :: String.t()
def generate_config_file(opts, config_dir) do
template_config =
:prom_ex
|> :code.priv_dir()
|> List.to_string()
|> Path.join("/grafana_agent/default_config.yml.eex")
|> File.read!()

template_config = File.read!(template_file(opts))
rendered_config = EEx.eval_string(template_config, assigns: opts)
config_file_path = Path.join(config_dir, "agent.yml")
File.write(config_file_path, rendered_config)

config_file_path
end

defp template_file(%{template_file: file}), do: file

defp template_file(_) do
:prom_ex
|> :code.priv_dir()
|> List.to_string()
|> Path.join("/grafana_agent/default_config.yml.eex")
end
end
17 changes: 17 additions & 0 deletions test/prom_ex/grafana_agent/config_renderer_test.exs
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Expand Up @@ -29,5 +29,22 @@ defmodule PromEx.GrafanaAgent.ConfigRendererTest do
assert File.exists?(expected_file_path)
assert File.read!(expected_file_path) == File.read!("#{__DIR__}/expected_output_config.yml")
end

@tag :tmp_dir
test "should configure template", %{tmp_dir: tmp_dir} do
template_file = Path.join(tmp_dir, "my_template.yml.eex")
File.write!(template_file, "foo: <%= @foo %>")

template_args = %{
foo: "this is a foo",
template_file: template_file
}

ConfigRenderer.generate_config_file(template_args, tmp_dir)
expected_file_path = "#{tmp_dir}/agent.yml"

assert File.exists?(expected_file_path)
assert File.read!(expected_file_path) == "foo: this is a foo"
end
end
end