e219c13328
Simple helper function to generate a netstring that is a list of key-value pairs, to serialize a nix dict. Also adds a python lib to read the serialized form into a dict again. Change-Id: I306c0cfd51640c0658d32c8d3a4f3d332ba448f0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2315 Tested-by: BuildkiteCI Reviewed-by: Profpatsch <mail@profpatsch.de>
58 lines
1.3 KiB
Nix
58 lines
1.3 KiB
Nix
{ lib, pkgs, depot, ... }:
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let
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toNetstring = s:
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"${toString (builtins.stringLength s)}:${s},";
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toNetstringKeyVal = attrs:
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lib.concatStrings
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(lib.mapAttrsToList
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(k: v: toNetstring (toNetstring k + toNetstring v))
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attrs);
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python-netstring = depot.users.Profpatsch.writers.python3Lib {
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name = "netstring";
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} ''
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def read_netstring(bytes):
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(int_length, rest) = bytes.split(sep=b':', maxsplit=1)
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val = rest[:int(int_length)]
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# has to end on a ,
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assert(rest[len(val)] == ord(','))
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return (val, rest[len(val) + 1:])
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def read_netstring_key_val(bytes):
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(keyvalnet, rest) = read_netstring(bytes)
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(key, valnet) = read_netstring(keyvalnet)
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(val, nothing) = read_netstring(valnet)
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assert(nothing == b"")
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return (key, val, rest)
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def read_netstring_key_val_list(bytes):
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rest = bytes
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res = {}
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while rest != b"":
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(key, val, r) = read_netstring_key_val(rest)
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rest = r
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res[key] = val
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return res
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'';
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tests = import ./tests.nix {
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inherit
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depot
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pkgs
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lib
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python-netstring
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toNetstring
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toNetstringKeyVal
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;
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};
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in {
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inherit
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toNetstring
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toNetstringKeyVal
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python-netstring
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tests
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;
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}
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