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New Relic's Open-Source Elixir Agent
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lib/new_relic/util/vendor.ex
defmodule NewRelic.Util.Vendor do
@moduledoc false
def maybe_add_vendors(util, options \\ []) do
%{}
|> maybe_add_aws(options)
|> maybe_add_kubernetes(options)
|> maybe_add_docker(options)
|> case do
vendors when map_size(vendors) == 0 -> util
vendors -> Map.put(util, :vendors, vendors)
end
end
@aws_url "http://169.254.169.254/2016-09-02/dynamic/instance-identity/document"
defp maybe_add_aws(vendors, options) do
Keyword.get(options, :aws_url, @aws_url)
|> aws_vendor_map()
|> case do
nil -> vendors
aws_hash -> Map.put(vendors, :aws, aws_hash)
end
end
defp maybe_add_kubernetes(vendors, _options) do
System.get_env("KUBERNETES_SERVICE_HOST")
|> case do
nil -> vendors
value -> Map.put(vendors, :kubernetes, %{kubernetes_service_host: value})
end
end
@cgroup_filename "/proc/self/cgroup"
defp maybe_add_docker(vendors, options) do
Keyword.get(options, :cgroup_filename, @cgroup_filename)
|> docker_vendor_map()
|> case do
nil -> vendors
docker -> Map.put(vendors, :docker, docker)
end
end
@cgroup_matcher ~r/\d+:.*cpu[,:].*(?<id>[0-9a-f]{64}).*/
defp docker_vendor_map(cgroup_filename) do
File.read(cgroup_filename)
|> case do
{:ok, cgroup_file} ->
cgroup_file
|> String.split("\n", trim: true)
|> Enum.find_value(&Regex.named_captures(@cgroup_matcher, &1))
_ ->
nil
end
end
@aws_vendor_data ["availabilityZone", "instanceId", "instanceType"]
defp aws_vendor_map(url) do
case :httpc.request(:get, {~c(#{url}), []}, [{:timeout, 100}], []) do
{:ok, {{_, 200, ~c"OK"}, _headers, body}} ->
case NewRelic.JSON.decode(to_string(body)) do
{:ok, data} -> Map.take(data, @aws_vendor_data)
_ -> nil
end
_error ->
nil
end
rescue
exception ->
NewRelic.log(:error, "Failed to fetch AWS metadata. #{inspect(exception)}")
nil
end
end