defmodule ExOvh.Auth.Ovh.Cache do
# Stores the time diff in state of the gen_server - later used in authentication headers for every request
@moduledoc :false
use GenServer
# Public
def start_link(client) do
Og.context(__ENV__, :debug)
GenServer.start_link(__MODULE__, client, [name: client])
end
@doc "Retrieves the ovh api time diff from the state"
def get_time_diff(client) do
GenServer.call(client, :get_diff)
end
# Genserver Callbacks
def init(client) do
Og.context(__ENV__, :debug)
diff = calculate_diff(client)
|> Og.log_return(:error)
{:ok, diff}
end
def handle_call(:get_diff, _from, diff) do
Og.context(__ENV__, :debug)
{:reply, diff, diff}
|> Og.log_return(__ENV__, :warn)
end
def terminate(:shutdown, state) do
Og.context(__ENV__, :warn)
Og.log_return("gen_server #{__MODULE__} shutting down", :warn)
:ok
end
# Private
defp calculate_diff(client) do
Og.context(__ENV__, :debug)
api_time = api_time_request(client)
os_t = :os.system_time(:seconds)
os_t - api_time
end
defp api_time_request(client) do
Og.context(__ENV__, :debug)
client |> Og.log_return(__ENV__)
ovh_config = client.config() |> Og.log_return(__ENV__)
method = :get
uri = ovh_config[:endpoint] <> ovh_config[:api_version] <> "/auth/time"
body = ""
headers = [{"Content-Type", "application/json; charset=utf-8"}]
client |> Og.log_return(__ENV__)
httpoison_opts = client.httpoison_config()
options = httpoison_opts
{method, uri, body, headers, options} |> Og.log_return(__ENV__, :warn)
resp = HTTPoison.request!(method, uri, body, headers, options)
api_time = Poison.decode!(resp.body)
end
end
