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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.

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electric lib pg_interop postgrex extensions pg_snapshot.ex
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lib/pg_interop/postgrex/extensions/pg_snapshot.ex 

defmodule PgInterop.Postgrex.Extensions.PgSnapshot do

  use Postgrex.BinaryExtension, send: "pg_snapshot_send"

  import Postgrex.BinaryUtils, warn: false



  def encode(_state) do

    quote location: :keep do

      _ -> raise DBConnection.EncodeError, "encoding of type pg_snapshot not implemented"

    end

  end



  def decode(_) do

    quote location: :keep do

      <<len::int32(), nxip::int32(), xmin::uint64(), xmax::uint64(), rest::binary-size(len - 20)>> ->

        xip_list = for <<xid::uint64() <- rest>>, do: xid

        true = nxip == length(xip_list)

        {xmin, xmax, xip_list}

    end

  end

end