106 lines
2.8 KiB
Elixir
106 lines
2.8 KiB
Elixir
defmodule ProxmoxAgent.Collectors.Host do
|
|
@moduledoc """
|
|
Reads host metrics from /proc. Accepts `proc_dir:` option for testability.
|
|
Never raises — on read failure, populates `:errors` and leaves the field nil.
|
|
"""
|
|
|
|
@type sample :: %{
|
|
hostname: String.t(),
|
|
load1: float() | nil,
|
|
load5: float() | nil,
|
|
load15: float() | nil,
|
|
mem_total_bytes: non_neg_integer() | nil,
|
|
mem_available_bytes: non_neg_integer() | nil,
|
|
mem_used_bytes: non_neg_integer() | nil,
|
|
uptime_seconds: non_neg_integer() | nil,
|
|
errors: [term()]
|
|
}
|
|
|
|
@spec collect(keyword()) :: sample()
|
|
def collect(opts \\ []) do
|
|
proc_dir = Keyword.get(opts, :proc_dir, "/proc")
|
|
|
|
{load, e1} = safe(fn -> read_loadavg(proc_dir) end, {nil, nil, nil}, :loadavg)
|
|
{mem, e2} = safe(fn -> read_meminfo(proc_dir) end, %{total: nil, available: nil}, :meminfo)
|
|
{uptime, e3} = safe(fn -> read_uptime(proc_dir) end, nil, :uptime)
|
|
|
|
total = mem.total
|
|
avail = mem.available
|
|
used = if total && avail, do: total - avail, else: nil
|
|
{load1, load5, load15} = load
|
|
|
|
%{
|
|
hostname: hostname(),
|
|
load1: load1,
|
|
load5: load5,
|
|
load15: load15,
|
|
mem_total_bytes: total,
|
|
mem_available_bytes: avail,
|
|
mem_used_bytes: used,
|
|
uptime_seconds: uptime,
|
|
errors: Enum.filter([e1, e2, e3], & &1)
|
|
}
|
|
end
|
|
|
|
defp safe(fun, fallback, tag) do
|
|
try do
|
|
{fun.(), nil}
|
|
rescue
|
|
e -> {fallback, {tag, Exception.message(e)}}
|
|
catch
|
|
:error, reason -> {fallback, {tag, reason}}
|
|
end
|
|
end
|
|
|
|
defp read_loadavg(proc_dir) do
|
|
body = File.read!(Path.join(proc_dir, "loadavg"))
|
|
[l1, l5, l15 | _] = String.split(body, ~r/\s+/, trim: true)
|
|
{to_float(l1), to_float(l5), to_float(l15)}
|
|
end
|
|
|
|
defp read_meminfo(proc_dir) do
|
|
body = File.read!(Path.join(proc_dir, "meminfo"))
|
|
|
|
parsed =
|
|
body
|
|
|> String.split("\n", trim: true)
|
|
|> Enum.reduce(%{}, fn line, acc ->
|
|
case String.split(line, ~r/:\s+/, parts: 2) do
|
|
[key, val] -> Map.put(acc, key, val)
|
|
_ -> acc
|
|
end
|
|
end)
|
|
|
|
%{
|
|
total: kb_to_bytes(parsed["MemTotal"]),
|
|
available: kb_to_bytes(parsed["MemAvailable"])
|
|
}
|
|
end
|
|
|
|
defp read_uptime(proc_dir) do
|
|
body = File.read!(Path.join(proc_dir, "uptime"))
|
|
[secs | _] = String.split(body, " ", trim: true)
|
|
secs |> to_float() |> trunc()
|
|
end
|
|
|
|
defp kb_to_bytes(nil), do: nil
|
|
|
|
defp kb_to_bytes(str) do
|
|
case Regex.run(~r/(\d+)\s*kB/, str) do
|
|
[_, kb] -> String.to_integer(kb) * 1024
|
|
_ -> nil
|
|
end
|
|
end
|
|
|
|
defp to_float(s) do
|
|
{f, _} = Float.parse(s)
|
|
f
|
|
end
|
|
|
|
defp hostname do
|
|
case :inet.gethostname() do
|
|
{:ok, name} -> List.to_string(name)
|
|
_ -> "unknown-host"
|
|
end
|
|
end
|
|
end
|