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refactor(tvix/nix-compat/wire): express magics as u64

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This allows using read_u64, write_u64, which is a bit easier to juggle
with.

Also, update names to align with the nix codebase, which makes it easier
to spot both the constant name as well as the value.
Leave the ASCII interpretation as a comment afterwards.

Change-Id: I0b9ab187acd22807e2785b0722aa4300dab37c51
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11378
Tested-by: BuildkiteCI
Reviewed-by: picnoir picnoir <picnoir@alternativebit.fr>
Autosubmit: flokli <flokli@flokli.de>
This commit is contained in:
Florian Klink 2024-04-08 11:31:41 +03:00 • committed by clbot
parent fd749070e2
commit c05f90e611
2 changed files with 15 additions and 21 deletions
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13
tvix/nix-compat/src/wire/worker_protocol.rs
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@ -11,14 +11,11 @@ use crate::wire::primitive;
use super::bytes::read_string;
// LE-encoded nixc on 64 bits. Because why not.
pub static MAGIC_HELLO: [u8; 8] = *b"cxin\0\0\0\0";
// LE-encoded dxio on 64 bits. What's dxio? I have no clue.
pub static MAGIC_HELLO_RESPONSE: [u8; 8] = *b"oixd\0\0\0\0";
// LE-encoded protocol version.
pub static PROTOCOL_VERSION: [u8; 8] = [0x23, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
pub static STDERR_LAST: u64 = 0x616c7473;
pub static WORKER_MAGIC_1: u64 = 0x6e697863; // "nixc"
pub static WORKER_MAGIC_2: u64 = 0x6478696f; // "dxio"
pub static STDERR_LAST: u64 = 0x616c7473; // "alts"
/// Protocol version (1.35)
pub static PROTOCOL_VERSION: u64 = 1 << 8 | 35;
/// Max length of a Nix setting name/value. In bytes.
///