diff options
Diffstat (limited to 'tvix/nix-compat')
| -rw-r--r-- | tvix/nix-compat/Cargo.toml | 8 | ||||
| -rw-r--r-- | tvix/nix-compat/src/lib.rs | 4 | ||||
| -rw-r--r-- | tvix/nix-compat/src/nar/wire/mod.rs | 2 | ||||
| -rw-r--r-- | tvix/nix-compat/src/nix_daemon/handler.rs | 229 | ||||
| -rw-r--r-- | tvix/nix-compat/src/nix_daemon/mod.rs | 7 | ||||
| -rw-r--r-- | tvix/nix-compat/src/nix_daemon/types.rs | 62 | ||||
| -rw-r--r-- | tvix/nix-compat/src/nix_daemon/worker_protocol.rs | 203 | ||||
| -rw-r--r-- | tvix/nix-compat/src/wire/ser/bytes.rs | 9 | ||||
| -rw-r--r-- | tvix/nix-compat/src/wire/ser/mod.rs | 10 |
9 files changed, 360 insertions, 174 deletions
diff --git a/tvix/nix-compat/Cargo.toml b/tvix/nix-compat/Cargo.toml index cbbf97175d14..e9b44ddb7adf 100644 --- a/tvix/nix-compat/Cargo.toml +++ b/tvix/nix-compat/Cargo.toml @@ -8,10 +8,13 @@ edition = "2021" async = ["tokio"] # code emitting low-level packets used in the daemon protocol. wire = ["tokio", "pin-project-lite", "bytes"] + +# nix-daemon protocol handling +daemon = ["tokio", "nix-compat-derive"] test = [] # Enable all features by default. -default = ["async", "wire", "nix-compat-derive"] +default = ["async", "daemon", "wire", "nix-compat-derive"] [dependencies] bitflags = { workspace = true } @@ -30,8 +33,9 @@ sha2 = { workspace = true } thiserror = { workspace = true } tracing = { workspace = true } bytes = { workspace = true, optional = true } -tokio = { workspace = true, features = ["io-util", "macros"], optional = true } +tokio = { workspace = true, features = ["io-util", "macros", "sync"], optional = true } pin-project-lite = { workspace = true, optional = true } +num_enum = "0.7.3" [dependencies.nix-compat-derive] path = "../nix-compat-derive" diff --git a/tvix/nix-compat/src/lib.rs b/tvix/nix-compat/src/lib.rs index ae9f1674468e..4c327fa4569b 100644 --- a/tvix/nix-compat/src/lib.rs +++ b/tvix/nix-compat/src/lib.rs @@ -14,7 +14,7 @@ pub mod store_path; #[cfg(feature = "wire")] pub mod wire; -#[cfg(feature = "wire")] +#[cfg(feature = "daemon")] pub mod nix_daemon; -#[cfg(feature = "wire")] +#[cfg(feature = "daemon")] pub use nix_daemon::worker_protocol; diff --git a/tvix/nix-compat/src/nar/wire/mod.rs b/tvix/nix-compat/src/nar/wire/mod.rs index ddf021bc1fa1..67654129ee1d 100644 --- a/tvix/nix-compat/src/nar/wire/mod.rs +++ b/tvix/nix-compat/src/nar/wire/mod.rs @@ -91,9 +91,11 @@ pub const TOK_ENT: [u8; 48] = *b"\x05\0\0\0\0\0\0\0entry\0\0\0\x01\0\0\0\0\0\0\0 pub const TOK_NOD: [u8; 48] = *b"\x04\0\0\0\0\0\0\0node\0\0\0\0\x01\0\0\0\0\0\0\0(\0\0\0\0\0\0\0\x04\0\0\0\0\0\0\0type\0\0\0\0"; pub const TOK_PAR: [u8; 16] = *b"\x01\0\0\0\0\0\0\0)\0\0\0\0\0\0\0"; #[cfg(feature = "async")] +#[allow(dead_code)] const TOK_PAD_PAR: [u8; 24] = *b"\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0)\0\0\0\0\0\0\0"; #[cfg(feature = "async")] +#[allow(dead_code)] #[derive(Debug)] pub(crate) enum PadPar {} diff --git a/tvix/nix-compat/src/nix_daemon/handler.rs b/tvix/nix-compat/src/nix_daemon/handler.rs new file mode 100644 index 000000000000..c0257d979acc --- /dev/null +++ b/tvix/nix-compat/src/nix_daemon/handler.rs @@ -0,0 +1,229 @@ +use std::{future::Future, sync::Arc}; + +use tokio::{ + io::{split, AsyncReadExt, AsyncWriteExt, ReadHalf, WriteHalf}, + sync::Mutex, +}; +use tracing::debug; + +use super::{ + worker_protocol::{server_handshake_client, ClientSettings, Operation, Trust, STDERR_LAST}, + NixDaemonIO, +}; +use crate::wire::{ + de::{NixRead, NixReader}, + ser::{NixSerialize, NixWrite, NixWriter, NixWriterBuilder}, + ProtocolVersion, +}; +use crate::{nix_daemon::types::NixError, worker_protocol::STDERR_ERROR}; + +/// Handles a single connection with a nix client. +/// +/// As part of its [`initialization`] it performs the handshake with the client +/// and determines the [ProtocolVersion] and [ClientSettings] to use for the remainder of the session. +/// +/// Once initialized, [`handle_client`] needs to be called to handle the rest of the session, +/// it delegates all operation handling to an instance of [NixDaemonIO]. +/// +/// [`initialization`]: NixDaemon::initialize +#[allow(dead_code)] +pub struct NixDaemon<IO, R, W> { + io: Arc<IO>, + protocol_version: ProtocolVersion, + client_settings: ClientSettings, + reader: NixReader<R>, + writer: Arc<Mutex<NixWriter<W>>>, +} + +impl<IO, R, W> NixDaemon<IO, R, W> +where + IO: NixDaemonIO + Sync + Send, +{ + pub fn new( + io: Arc<IO>, + protocol_version: ProtocolVersion, + client_settings: ClientSettings, + reader: NixReader<R>, + writer: NixWriter<W>, + ) -> Self { + Self { + io, + protocol_version, + client_settings, + reader, + writer: Arc::new(Mutex::new(writer)), + } + } +} + +impl<IO, RW> NixDaemon<IO, ReadHalf<RW>, WriteHalf<RW>> +where + RW: AsyncReadExt + AsyncWriteExt + Send + Unpin + 'static, + IO: NixDaemonIO + Sync + Send, +{ + /// Async constructor for NixDaemon. + /// + /// Performs the initial handshake with the client and retrieves the client's preferred + /// settings. + /// + /// The resulting daemon can handle the client session by calling [NixDaemon::handle_client]. + pub async fn initialize(io: Arc<IO>, mut connection: RW) -> Result<Self, std::io::Error> + where + RW: AsyncReadExt + AsyncWriteExt + Send + Unpin, + { + let protocol_version = + server_handshake_client(&mut connection, "2.18.2", Trust::Trusted).await?; + + connection.write_u64_le(STDERR_LAST).await?; + let (reader, writer) = split(connection); + let mut reader = NixReader::builder() + .set_version(protocol_version) + .build(reader); + let mut writer = NixWriterBuilder::default() + .set_version(protocol_version) + .build(writer); + + // The first op is always SetOptions + let operation: Operation = reader.read_value().await?; + if operation != Operation::SetOptions { + return Err(std::io::Error::other( + "Expected SetOptions operation, but got {operation}", + )); + } + let client_settings: ClientSettings = reader.read_value().await?; + writer.write_number(STDERR_LAST).await?; + writer.flush().await?; + + Ok(Self::new( + io, + protocol_version, + client_settings, + reader, + writer, + )) + } + + /// Main client connection loop, reads client's requests and responds to them accordingly. + pub async fn handle_client(&mut self) -> Result<(), std::io::Error> { + loop { + let op_code = self.reader.read_number().await?; + match TryInto::<Operation>::try_into(op_code) { + Ok(operation) => match operation { + Operation::SetOptions => { + self.client_settings = self.reader.read_value().await?; + self.handle(async { Ok(()) }).await? + } + _ => { + return Err(std::io::Error::other(format!( + "Operation {operation:?} is not implemented" + ))); + } + }, + _ => { + return Err(std::io::Error::other(format!( + "Unknown operation code received: {op_code}" + ))); + } + } + } + } + + /// Handles the operation and sends the response or error to the client. + /// + /// As per nix daemon protocol, after sending the request, the client expects zero or more + /// log lines/activities followed by either + /// * STDERR_LAST and the response bytes + /// * STDERR_ERROR and the error + /// + /// This is a helper method, awaiting on the passed in future and then + /// handling log lines/activities as described above. + async fn handle<T>( + &mut self, + future: impl Future<Output = std::io::Result<T>>, + ) -> Result<(), std::io::Error> + where + T: NixSerialize + Send, + { + let result = future.await; + let mut writer = self.writer.lock().await; + + match result { + Ok(r) => { + // the protocol requires that we first indicate that we are done sending logs + // by sending STDERR_LAST and then the response. + writer.write_number(STDERR_LAST).await?; + writer.write_value(&r).await?; + writer.flush().await + } + Err(e) => { + debug!(err = ?e, "IO error"); + writer.write_number(STDERR_ERROR).await?; + writer.write_value(&NixError::new(format!("{e:?}"))).await?; + writer.flush().await + } + } + } +} + +#[cfg(test)] +mod tests { + use super::*; + use std::sync::Arc; + + use tokio::io::AsyncWriteExt; + + use crate::{ + wire::ProtocolVersion, + worker_protocol::{ClientSettings, WORKER_MAGIC_1, WORKER_MAGIC_2}, + }; + + struct MockDaemonIO {} + + impl NixDaemonIO for MockDaemonIO {} + + #[tokio::test] + async fn test_daemon_initialization() { + let mut builder = tokio_test::io::Builder::new(); + let test_conn = builder + .read(&WORKER_MAGIC_1.to_le_bytes()) + .write(&WORKER_MAGIC_2.to_le_bytes()) + // Our version is 1.37 + .write(&[37, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]) + // The client's versin is 1.35 + .read(&[35, 1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]) + // cpu affinity + .read(&[0; 8]) + // reservespace + .read(&[0; 8]) + // version (size) + .write(&[0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]) + // version (data == 2.18.2 + padding) + .write(&[50, 46, 49, 56, 46, 50, 0, 0]) + // Trusted (1 == client trusted) + .write(&[1, 0, 0, 0, 0, 0, 0, 0]) + // STDERR_LAST + .write(&[115, 116, 108, 97, 0, 0, 0, 0]); + + let mut bytes = Vec::new(); + let mut writer = NixWriter::new(&mut bytes); + writer + .write_value(&ClientSettings::default()) + .await + .unwrap(); + writer.flush().await.unwrap(); + + let test_conn = test_conn + // SetOptions op + .read(&[19, 0, 0, 0, 0, 0, 0, 0]) + .read(&bytes) + // STDERR_LAST + .write(&[115, 116, 108, 97, 0, 0, 0, 0]) + .build(); + + let daemon = NixDaemon::initialize(Arc::new(MockDaemonIO {}), test_conn) + .await + .unwrap(); + assert_eq!(daemon.client_settings, ClientSettings::default()); + assert_eq!(daemon.protocol_version, ProtocolVersion::from_parts(1, 35)); + } +} diff --git a/tvix/nix-compat/src/nix_daemon/mod.rs b/tvix/nix-compat/src/nix_daemon/mod.rs index 633fdbebd47c..af487aea37bb 100644 --- a/tvix/nix-compat/src/nix_daemon/mod.rs +++ b/tvix/nix-compat/src/nix_daemon/mod.rs @@ -1 +1,8 @@ +pub mod handler; +pub mod types; pub mod worker_protocol; + +/// Represents all possible operations over the nix-daemon protocol. +pub trait NixDaemonIO { + // TODO add methods to it. +} diff --git a/tvix/nix-compat/src/nix_daemon/types.rs b/tvix/nix-compat/src/nix_daemon/types.rs new file mode 100644 index 000000000000..6b038ae8aa85 --- /dev/null +++ b/tvix/nix-compat/src/nix_daemon/types.rs @@ -0,0 +1,62 @@ +use nix_compat_derive::{NixDeserialize, NixSerialize}; + +/// Marker type that consumes/sends and ignores a u64. +#[derive(Clone, Debug, NixDeserialize, NixSerialize)] +#[nix(from = "u64", into = "u64")] +pub struct IgnoredZero; +impl From<u64> for IgnoredZero { + fn from(_: u64) -> Self { + IgnoredZero + } +} + +impl From<IgnoredZero> for u64 { + fn from(_: IgnoredZero) -> Self { + 0 + } +} + +#[derive(Debug, NixSerialize)] +pub struct TraceLine { + have_pos: IgnoredZero, + hint: String, +} + +/// Represents an error returned by the nix-daemon to its client. +/// +/// Adheres to the format described in serialization.md +#[derive(NixSerialize)] +pub struct NixError { + #[nix(version = "26..")] + type_: &'static str, + + #[nix(version = "26..")] + level: u64, + + #[nix(version = "26..")] + name: &'static str, + + msg: String, + #[nix(version = "26..")] + have_pos: IgnoredZero, + + #[nix(version = "26..")] + traces: Vec<TraceLine>, + + #[nix(version = "..=25")] + exit_status: u64, +} + +impl NixError { + pub fn new(msg: String) -> Self { + Self { + type_: "Error", + level: 0, // error + name: "Error", + msg, + have_pos: IgnoredZero {}, + traces: vec![], + exit_status: 1, + } + } +} diff --git a/tvix/nix-compat/src/nix_daemon/worker_protocol.rs b/tvix/nix-compat/src/nix_daemon/worker_protocol.rs index 92259a0633a0..1ef9b9ab02d7 100644 --- a/tvix/nix-compat/src/nix_daemon/worker_protocol.rs +++ b/tvix/nix-compat/src/nix_daemon/worker_protocol.rs @@ -1,20 +1,21 @@ use std::{ cmp::min, - collections::HashMap, + collections::BTreeMap, io::{Error, ErrorKind}, }; -use enum_primitive_derive::Primitive; -use num_traits::{FromPrimitive, ToPrimitive}; +use nix_compat_derive::{NixDeserialize, NixSerialize}; +use num_enum::{FromPrimitive, IntoPrimitive, TryFromPrimitive}; use tokio::io::{AsyncReadExt, AsyncWriteExt}; use crate::wire; use crate::wire::ProtocolVersion; -static WORKER_MAGIC_1: u64 = 0x6e697863; // "nixc" -static WORKER_MAGIC_2: u64 = 0x6478696f; // "dxio" +pub(crate) static WORKER_MAGIC_1: u64 = 0x6e697863; // "nixc" +pub(crate) static WORKER_MAGIC_2: u64 = 0x6478696f; // "dxio" pub static STDERR_LAST: u64 = 0x616c7473; // "alts" +pub(crate) static STDERR_ERROR: u64 = 0x63787470; // "cxtp" /// | Nix version | Protocol | /// |-----------------|----------| @@ -55,7 +56,11 @@ pub static MAX_SETTING_SIZE: usize = 1024; /// Note: for now, we're using the Nix 2.20 operation description. The /// operations marked as obsolete are obsolete for Nix 2.20, not /// necessarily for Nix 2.3. We'll revisit this later on. -#[derive(Debug, PartialEq, Primitive)] +#[derive( + Clone, Debug, PartialEq, TryFromPrimitive, IntoPrimitive, NixDeserialize, NixSerialize, +)] +#[nix(try_from = "u64", into = "u64")] +#[repr(u64)] pub enum Operation { IsValidPath = 1, HasSubstitutes = 3, @@ -106,8 +111,13 @@ pub enum Operation { /// Log verbosity. In the Nix wire protocol, the client requests a /// verbosity level to the daemon, which in turns does not produce any /// log below this verbosity. -#[derive(Debug, PartialEq, Primitive)] +#[derive( + Debug, PartialEq, FromPrimitive, IntoPrimitive, NixDeserialize, NixSerialize, Default, Clone, +)] +#[nix(from = "u64", into = "u64")] +#[repr(u64)] pub enum Verbosity { + #[default] LvlError = 0, LvlWarn = 1, LvlNotice = 2, @@ -120,7 +130,7 @@ pub enum Verbosity { /// Settings requested by the client. These settings are applied to a /// connection to between the daemon and a client. -#[derive(Debug, PartialEq)] +#[derive(Debug, PartialEq, NixDeserialize, NixSerialize, Default)] pub struct ClientSettings { pub keep_failed: bool, pub keep_going: bool, @@ -128,70 +138,21 @@ pub struct ClientSettings { pub verbosity: Verbosity, pub max_build_jobs: u64, pub max_silent_time: u64, - pub verbose_build: bool, + pub use_build_hook: bool, + pub verbose_build: u64, + pub log_type: u64, + pub print_build_trace: u64, pub build_cores: u64, pub use_substitutes: bool, + /// Key/Value dictionary in charge of overriding the settings set /// by the Nix config file. /// /// Some settings can be safely overidden, /// some other require the user running the Nix client to be part /// of the trusted users group. - pub overrides: HashMap<String, String>, -} - -/// Reads the client settings from the wire. -/// -/// Note: this function **only** reads the settings. It does not -/// manage the log state with the daemon. You'll have to do that on -/// your own. A minimal log implementation will consist in sending -/// back [STDERR_LAST] to the client after reading the client -/// settings. -/// -/// FUTUREWORK: write serialization. -pub async fn read_client_settings<R: AsyncReadExt + Unpin>( - r: &mut R, - client_version: ProtocolVersion, -) -> std::io::Result<ClientSettings> { - let keep_failed = r.read_u64_le().await? != 0; - let keep_going = r.read_u64_le().await? != 0; - let try_fallback = r.read_u64_le().await? != 0; - let verbosity_uint = r.read_u64_le().await?; - let verbosity = Verbosity::from_u64(verbosity_uint).ok_or_else(|| { - Error::new( - ErrorKind::InvalidData, - format!("Can't convert integer {} to verbosity", verbosity_uint), - ) - })?; - let max_build_jobs = r.read_u64_le().await?; - let max_silent_time = r.read_u64_le().await?; - _ = r.read_u64_le().await?; // obsolete useBuildHook - let verbose_build = r.read_u64_le().await? != 0; - _ = r.read_u64_le().await?; // obsolete logType - _ = r.read_u64_le().await?; // obsolete printBuildTrace - let build_cores = r.read_u64_le().await?; - let use_substitutes = r.read_u64_le().await? != 0; - let mut overrides = HashMap::new(); - if client_version.minor() >= 12 { - let num_overrides = r.read_u64_le().await?; - for _ in 0..num_overrides { - let name = wire::read_string(r, 0..=MAX_SETTING_SIZE).await?; - let value = wire::read_string(r, 0..=MAX_SETTING_SIZE).await?; - overrides.insert(name, value); - } - } - Ok(ClientSettings { - keep_failed, - keep_going, - try_fallback, - verbosity, - max_build_jobs, - max_silent_time, - verbose_build, - build_cores, - use_substitutes, - overrides, - }) + #[nix(version = "12..")] + pub overrides: BTreeMap<String, String>, } /// Performs the initial handshake the server is sending to a connecting client. @@ -269,18 +230,17 @@ where /// Read a worker [Operation] from the wire. pub async fn read_op<R: AsyncReadExt + Unpin>(r: &mut R) -> std::io::Result<Operation> { let op_number = r.read_u64_le().await?; - Operation::from_u64(op_number).ok_or(Error::new( - ErrorKind::InvalidData, - format!("Invalid OP number {}", op_number), - )) + Operation::try_from(op_number).map_err(|_| { + Error::new( + ErrorKind::InvalidData, + format!("Invalid OP number {}", op_number), + ) + }) } /// Write a worker [Operation] to the wire. -pub async fn write_op<W: AsyncWriteExt + Unpin>(w: &mut W, op: &Operation) -> std::io::Result<()> { - let op = Operation::to_u64(op).ok_or(Error::new( - ErrorKind::Other, - format!("Can't convert the OP {:?} to u64", op), - ))?; +pub async fn write_op<W: AsyncWriteExt + Unpin>(w: &mut W, op: Operation) -> std::io::Result<()> { + let op: u64 = op.into(); w.write_u64(op).await } @@ -309,8 +269,6 @@ where #[cfg(test)] mod tests { use super::*; - use hex_literal::hex; - use tokio_test::io::Builder; #[tokio::test] async fn test_init_hanshake() { @@ -391,99 +349,4 @@ mod tests { assert_eq!(picked_version, ProtocolVersion::from_parts(1, 24)) } - - #[tokio::test] - async fn test_read_client_settings_without_overrides() { - // Client settings bits captured from a Nix 2.3.17 run w/ sockdump (protocol version 21). - let wire_bits = hex!( - "00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 02 00 00 00 00 00 00 00 \ - 10 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 01 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 01 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00" - ); - let mut mock = Builder::new().read(&wire_bits).build(); - let settings = read_client_settings(&mut mock, ProtocolVersion::from_parts(1, 21)) - .await - .expect("should parse"); - let expected = ClientSettings { - keep_failed: false, - keep_going: false, - try_fallback: false, - verbosity: Verbosity::LvlNotice, - max_build_jobs: 16, - max_silent_time: 0, - verbose_build: false, - build_cores: 0, - use_substitutes: true, - overrides: HashMap::new(), - }; - assert_eq!(settings, expected); - } - - #[tokio::test] - async fn test_read_client_settings_with_overrides() { - // Client settings bits captured from a Nix 2.3.17 run w/ sockdump (protocol version 21). - let wire_bits = hex!( - "00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 02 00 00 00 00 00 00 00 \ - 10 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 01 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 00 00 00 00 00 00 00 00 \ - 01 00 00 00 00 00 00 00 \ - 02 00 00 00 00 00 00 00 \ - 0c 00 00 00 00 00 00 00 \ - 61 6c 6c 6f 77 65 64 2d \ - 75 72 69 73 00 00 00 00 \ - 1e 00 00 00 00 00 00 00 \ - 68 74 74 70 73 3a 2f 2f \ - 62 6f 72 64 65 61 75 78 \ - 2e 67 75 69 78 2e 67 6e \ - 75 2e 6f 72 67 2f 00 00 \ - 0d 00 00 00 00 00 00 00 \ - 61 6c 6c 6f 77 65 64 2d \ - 75 73 65 72 73 00 00 00 \ - 0b 00 00 00 00 00 00 00 \ - 6a 65 61 6e 20 70 69 65 \ - 72 72 65 00 00 00 00 00" - ); - let mut mock = Builder::new().read(&wire_bits).build(); - let settings = read_client_settings(&mut mock, ProtocolVersion::from_parts(1, 21)) - .await - .expect("should parse"); - let overrides = HashMap::from([ - ( - String::from("allowed-uris"), - String::from("https://bordeaux.guix.gnu.org/"), - ), - (String::from("allowed-users"), String::from("jean pierre")), - ]); - let expected = ClientSettings { - keep_failed: false, - keep_going: false, - try_fallback: false, - verbosity: Verbosity::LvlNotice, - max_build_jobs: 16, - max_silent_time: 0, - verbose_build: false, - build_cores: 0, - use_substitutes: true, - overrides, - }; - assert_eq!(settings, expected); - } } diff --git a/tvix/nix-compat/src/wire/ser/bytes.rs b/tvix/nix-compat/src/wire/ser/bytes.rs index 4338d3f8761e..737edb059b5b 100644 --- a/tvix/nix-compat/src/wire/ser/bytes.rs +++ b/tvix/nix-compat/src/wire/ser/bytes.rs @@ -38,6 +38,15 @@ impl NixSerialize for str { } } +impl NixSerialize for &str { + async fn serialize<W>(&self, writer: &mut W) -> Result<(), W::Error> + where + W: NixWrite, + { + writer.write_slice(self.as_bytes()).await + } +} + #[cfg(test)] mod test { use hex_literal::hex; diff --git a/tvix/nix-compat/src/wire/ser/mod.rs b/tvix/nix-compat/src/wire/ser/mod.rs index 5860226f39eb..ef3c6e2e372f 100644 --- a/tvix/nix-compat/src/wire/ser/mod.rs +++ b/tvix/nix-compat/src/wire/ser/mod.rs @@ -122,3 +122,13 @@ pub trait NixSerialize { where W: NixWrite; } + +// Noop +impl NixSerialize for () { + async fn serialize<W>(&self, _writer: &mut W) -> Result<(), W::Error> + where + W: NixWrite, + { + Ok(()) + } +} |