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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
def maybe_add_linux_boot_id(util) do
case File.read("/proc/sys/kernel/random/boot_id") do
{:ok, boot_id} -> Map.put(util, "boot_id", boot_id)
_ -> util
end
end
def maybe_heroku_dyno_hostname do
System.get_env("DYNO")
|> case do
nil -> nil
"scheduler." <> _ -> "scheduler.*"
"run." <> _ -> "run.*"
name -> name
end
end
@aws_url "http://169.254.169.254/2016-09-02/dynamic/instance-identity/document"
def maybe_add_cloud_vendors(util, options \\ []) do
Keyword.get(options, :aws_url, @aws_url)
|> aws_vendor_hash()
|> case do
nil -> util
aws_hash -> Map.put(util, :vendors, %{aws: aws_hash})
end
end
@aws_vendor_data ["availabilityZone", "instanceId", "instanceType"]
def aws_vendor_hash(url) do
case :httpc.request(:get, {~c(#{url}), []}, [{:timeout, 100}], []) do
{:ok, {{_, 200, 'OK'}, _headers, body}} ->
case Jason.decode(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