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PostgreSQL driver for Elixir
Security advisory:
This version has known vulnerabilities.
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lib/postgrex/extensions/time.ex
defmodule Postgrex.Extensions.Time do
@moduledoc false
import Postgrex.BinaryUtils, warn: false
use Postgrex.BinaryExtension, send: "time_send"
@default_precision 6
# -1: user did not specify precision
# nil: coming from a super type that does not pass modifier for sub-type
@unspecified_precision [-1, nil]
def encode(_) do
quote location: :keep do
%Time{calendar: Calendar.ISO} = time ->
unquote(__MODULE__).encode_elixir(time)
other ->
raise DBConnection.EncodeError, Postgrex.Utils.encode_msg(other, Time)
end
end
def decode(_) do
quote location: :keep do
<<8::int32(), microsecs::int64()>> ->
unquote(__MODULE__).microsecond_to_elixir(microsecs, var!(mod))
end
end
## Helpers
def encode_elixir(%Time{hour: hour, minute: min, second: sec, microsecond: {usec, _}})
when hour in 0..23 and min in 0..59 and sec in 0..59 and usec in 0..999_999 do
time = {hour, min, sec}
<<8::int32(), :calendar.time_to_seconds(time) * 1_000_000 + usec::int64()>>
end
def microsecond_to_elixir(microsec, precision) do
precision = if precision in @unspecified_precision, do: @default_precision, else: precision
sec = div(microsec, 1_000_000)
microsec = rem(microsec, 1_000_000)
sec
|> :calendar.seconds_to_time()
|> Time.from_erl!({microsec, precision})
end
end