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PostgreSQL driver for Elixir
Security advisory:
This version has known vulnerabilities.
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lib/postgrex/extensions/date.ex
defmodule Postgrex.Extensions.Date do
@moduledoc false
import Postgrex.BinaryUtils, warn: false
use Postgrex.BinaryExtension, send: "date_send"
@gd_epoch Date.to_gregorian_days(~D[2000-01-01])
@max_year 9999
# Latest date supported by Elixir. Postgresql
# supports later dates.
@max_days Date.to_gregorian_days(~D[9999-12-31])
# Elixir supports earlier dates but this is the
# earliest supported in Postgresql.
@min_days Date.to_gregorian_days(~D[-4713-01-01])
def encode(_) do
quote location: :keep do
%Date{calendar: Calendar.ISO} = date ->
unquote(__MODULE__).encode_elixir(date)
other ->
raise DBConnection.EncodeError, Postgrex.Utils.encode_msg(other, Date)
end
end
def decode(_) do
quote location: :keep do
<<4::int32(), days::int32()>> ->
unquote(__MODULE__).day_to_elixir(days)
end
end
## Helpers
def encode_elixir(%Date{year: year} = date) when year <= @max_year do
<<4::int32(), Date.to_gregorian_days(date) - @gd_epoch::int32()>>
end
def encode_elixir(%Date{} = date) do
raise ArgumentError, "#{inspect(date)} is beyond the maximum year #{@max_year}"
end
def day_to_elixir(days) do
days = days + @gd_epoch
if days in @min_days..@max_days do
Date.from_gregorian_days(days)
else
raise ArgumentError,
"Postgrex can only decode dates with days between #{@min_days} and #{@max_days}, " <>
"got: #{inspect(days)}"
end
end
end