Kernel.to_string(id)
end
- def to_string(flake = <<_::integer-size(64), _::integer-size(48), _::integer-size(16)>>) do
+ def to_string(<<_::integer-size(64), _::integer-size(48), _::integer-size(16)>> = flake) do
encode_base62(flake)
end
def from_string(unquote(Kernel.to_string(i))), do: <<0::integer-size(128)>>
end
- def from_string(flake = <<_::integer-size(128)>>), do: flake
+ def from_string(<<_::integer-size(128)>> = flake), do: flake
def from_string(string) when is_binary(string) and byte_size(string) < 18 do
case Integer.parse(string) do
- {id, _} -> <<0::integer-size(64), id::integer-size(64)>>
+ {id, ""} -> <<0::integer-size(64), id::integer-size(64)>>
_ -> nil
end
end
@spec get :: binary
def get, do: to_string(:gen_server.call(:flake, :get))
+ # checks that ID is is valid FlakeID
+ #
+ @spec is_flake_id?(String.t()) :: boolean
+ def is_flake_id?(id), do: is_flake_id?(String.to_charlist(id), true)
+ defp is_flake_id?([c | cs], true) when c >= ?0 and c <= ?9, do: is_flake_id?(cs, true)
+ defp is_flake_id?([c | cs], true) when c >= ?A and c <= ?Z, do: is_flake_id?(cs, true)
+ defp is_flake_id?([c | cs], true) when c >= ?a and c <= ?z, do: is_flake_id?(cs, true)
+ defp is_flake_id?([], true), do: true
+ defp is_flake_id?(_, _), do: false
+
# -- Ecto.Type API
@impl Ecto.Type
def type, do: :uuid
{:ok, FlakeId.from_string(value)}
end
- def autogenerate(), do: get()
+ def autogenerate, do: get()
# -- GenServer API
- def start_link do
+ def start_link(_) do
:gen_server.start_link({:local, :flake}, __MODULE__, [], [])
end
@impl GenServer
def init([]) do
- {:ok, %FlakeId{node: mac(), time: time()}}
+ {:ok, %FlakeId{node: worker_id(), time: time()}}
end
@impl GenServer
1_000_000_000 * mega_seconds + seconds * 1000 + :erlang.trunc(micro_seconds / 1000)
end
- def mac do
- {:ok, addresses} = :inet.getifaddrs()
-
- macids =
- Enum.reduce(addresses, [], fn {_iface, attrs}, acc ->
- case attrs[:hwaddr] do
- [0, 0, 0 | _] -> acc
- mac when is_list(mac) -> [mac_to_worker_id(mac) | acc]
- _ -> acc
- end
- end)
-
- List.first(macids)
- end
-
- def mac_to_worker_id(mac) do
- <<worker::integer-size(48)>> = :binary.list_to_bin(mac)
+ defp worker_id do
+ <<worker::integer-size(48)>> = :crypto.strong_rand_bytes(6)
worker
end
end