refactor(nix-compat): Move serialization machinery into wire.

This groups most `wire` feature gated logic into a single module.
The nix_daemon module will be gated by a feature that adds
nix-compat-derive as a dependency.

All of this is a way to break the crate2nix dependency cycle between
nix-compat and nix-compat-derive(which depends on nix-compat for its
doctests).

Change-Id: I95938a6f280c11967371ff21f8b5a19e6d3d3805
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12761
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/nix-compat/src/lib.rs

@@ -18,5 +18,3 @@ pub mod wire;
 pub mod nix_daemon;
 #[cfg(feature = "wire")]
 pub use nix_daemon::worker_protocol;
-#[cfg(feature = "wire")]
-pub use nix_daemon::ProtocolVersion;

tvix/nix-compat/src/nix_daemon/mod.rs

@@ -1,7 +1 @@
 pub mod worker_protocol;
-
-mod protocol_version;
-pub use protocol_version::ProtocolVersion;
-
-pub mod de;
-pub mod ser;

tvix/nix-compat/src/nix_daemon/worker_protocol.rs

@@ -10,7 +10,7 @@ use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
 use crate::wire;
 
-use super::ProtocolVersion;
+use crate::wire::ProtocolVersion;
 
 static WORKER_MAGIC_1: u64 = 0x6e697863; // "nixc"
 static WORKER_MAGIC_2: u64 = 0x6478696f; // "dxio"

tvix/nix-compat/src/wire/de/bytes.rs

@@ -34,7 +34,7 @@ mod test {
     use rstest::rstest;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::de::{NixRead, NixReader};
+    use crate::wire::de::{NixRead, NixReader};
 
     #[rstest]
     #[case::empty("", &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/de/collections.rs

@@ -64,7 +64,7 @@ mod test {
     use rstest::rstest;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::de::{NixDeserialize, NixRead, NixReader};
+    use crate::wire::de::{NixDeserialize, NixRead, NixReader};
 
     #[rstest]
     #[case::empty(vec![], &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/de/int.rs

@@ -45,7 +45,7 @@ mod test {
     use rstest::rstest;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::de::{NixRead, NixReader};
+    use crate::wire::de::{NixRead, NixReader};
 
     #[rstest]
     #[case::simple_false(false, &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/de/mock.rs

@@ -6,7 +6,7 @@ use std::thread;
 use bytes::Bytes;
 use thiserror::Error;
 
-use crate::nix_daemon::ProtocolVersion;
+use crate::wire::ProtocolVersion;
 
 use super::NixRead;
 
@@ -189,7 +189,7 @@ mod test {
     use bytes::Bytes;
     use hex_literal::hex;
 
-    use crate::nix_daemon::de::NixRead;
+    use crate::wire::de::NixRead;
 
     use super::{Builder, Error};
 

tvix/nix-compat/src/wire/de/reader.rs

@@ -8,8 +8,7 @@ use bytes::{Buf, BufMut, Bytes, BytesMut};
 use pin_project_lite::pin_project;
 use tokio::io::{AsyncBufRead, AsyncRead, AsyncReadExt, ReadBuf};
 
-use crate::nix_daemon::ProtocolVersion;
-use crate::wire::EMPTY_BYTES;
+use crate::wire::{ProtocolVersion, EMPTY_BYTES};
 
 use super::{Error, NixRead};
 
@@ -270,7 +269,7 @@ mod test {
     use tokio_test::io::Builder;
 
     use super::*;
-    use crate::nix_daemon::de::NixRead;
+    use crate::wire::de::NixRead;
 
     #[tokio::test]
     async fn test_read_u64() {

tvix/nix-compat/src/wire/mod.rs

@@ -3,3 +3,9 @@
 
 mod bytes;
 pub use bytes::*;
+
+mod protocol_version;
+pub use protocol_version::ProtocolVersion;
+
+pub mod de;
+pub mod ser;

tvix/nix-compat/src/wire/ser/bytes.rs

@@ -45,7 +45,7 @@ mod test {
     use tokio::io::AsyncWriteExt as _;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::ser::{NixWrite, NixWriter};
+    use crate::wire::ser::{NixWrite, NixWriter};
 
     #[rstest]
     #[case::empty("", &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/ser/collections.rs

@@ -53,7 +53,7 @@ mod test {
     use tokio::io::AsyncWriteExt as _;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::ser::{NixSerialize, NixWrite, NixWriter};
+    use crate::wire::ser::{NixSerialize, NixWrite, NixWriter};
 
     #[rstest]
     #[case::empty(vec![], &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/ser/int.rs

@@ -67,7 +67,7 @@ mod test {
     use tokio::io::AsyncWriteExt as _;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::ser::{NixWrite, NixWriter};
+    use crate::wire::ser::{NixWrite, NixWriter};
 
     #[rstest]
     #[case::simple_false(false, &hex!("0000 0000 0000 0000"))]

tvix/nix-compat/src/wire/ser/mock.rs

@@ -7,7 +7,7 @@ use std::thread;
 use ::proptest::prelude::TestCaseError;
 use thiserror::Error;
 
-use crate::nix_daemon::ProtocolVersion;
+use crate::wire::ProtocolVersion;
 
 use super::NixWrite;
 
@@ -491,11 +491,11 @@ mod test {
     use proptest::prelude::TestCaseError;
     use proptest::proptest;
 
-    use crate::nix_daemon::ser::mock::proptest::arb_extra_write;
-    use crate::nix_daemon::ser::mock::Operation;
-    use crate::nix_daemon::ser::mock::OperationType;
-    use crate::nix_daemon::ser::Error as _;
-    use crate::nix_daemon::ser::NixWrite;
+    use crate::wire::ser::mock::proptest::arb_extra_write;
+    use crate::wire::ser::mock::Operation;
+    use crate::wire::ser::mock::OperationType;
+    use crate::wire::ser::Error as _;
+    use crate::wire::ser::NixWrite;
 
     use super::{Builder, Error};
 

tvix/nix-compat/src/wire/ser/writer.rs

@@ -8,9 +8,7 @@ use bytes::{Buf, BufMut, BytesMut};
 use pin_project_lite::pin_project;
 use tokio::io::{AsyncWrite, AsyncWriteExt};
 
-use crate::nix_daemon::ProtocolVersion;
-use crate::wire::padding_len;
-use crate::wire::EMPTY_BYTES;
+use crate::wire::{padding_len, ProtocolVersion, EMPTY_BYTES};
 
 use super::{Error, NixWrite};
 
@@ -225,7 +223,7 @@ mod test {
     use tokio::io::AsyncWriteExt as _;
     use tokio_test::io::Builder;
 
-    use crate::nix_daemon::ser::NixWrite;
+    use crate::wire::ser::NixWrite;
 
     use super::NixWriter;