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Rust
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219use once_cell::sync::Lazy;use prost::Message as ProstMessage;use prost_reflect::DescriptorPool;use std::io;use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
pub mod v1 { include!("gen/spindle/agent/v1/spindle.agent.v1.rs");}
pub use v1::Message;
pub static DESCRIPTOR_POOL: Lazy<DescriptorPool> = Lazy::new(|| { let bytes = include_bytes!("gen/file_descriptor_set.bin"); DescriptorPool::decode(&bytes[..]).unwrap()});
macro_rules! impl_reflect { ($($t:ident),* $(,)?) => { $( impl prost_reflect::ReflectMessage for v1::$t { fn descriptor(&self) -> prost_reflect::MessageDescriptor { DESCRIPTOR_POOL .get_message_by_name(concat!("spindle.agent.v1.", stringify!($t))) .unwrap() } } )* };}
impl_reflect!( Hello, Init, ExecStart, ExecStdout, ExecStderr, ExecExit, ActivateConfig, ActivateConfigResult, BuiltPaths, CacheDrain, CacheDrainResult, Poweroff, PoweroffResult, OpenDebugShell, PtyData, PtyResize, Message,);
pub const PROTOCOL_VERSION: u32 = 1;pub const DEFAULT_PORT: u32 = 10240;pub const MAX_MESSAGE_BYTES: usize = 1024 * 1024;
#[macro_export]macro_rules! on_payload { (ref $msg:expr, { $( $field:ident => $body:expr ),* $(,)? }) => { #[allow(unused_variables)] $(if let Some(ref $field) = $msg.$field { Some($body) } else)* { None } }; ($msg:expr, { $( $field:ident => $body:expr ),* $(,)? }) => { $(if let Some($field) = $msg.$field { Some($body) } else )* { None } };}
pub fn kind(msg: &Message) -> &'static str { // todo(dawn): maybe eventually we should have a custom protoc plugin for // generating an enum, right now not worth it, when we have more needs for // it imo we can consider it again on_payload!(ref msg, { hello => "hello", init => "init", exec_start => "exec_start", exec_stdout => "exec_stdout", exec_stderr => "exec_stderr", exec_exit => "exec_exit", activate_config => "activate_config", activate_config_result => "activate_config_result", built_paths => "built_paths", cache_drain => "cache_drain", cache_drain_result => "cache_drain_result", poweroff => "poweroff", poweroff_result => "poweroff_result", open_debug_shell => "open_debug_shell", pty_data => "pty_data", pty_resize => "pty_resize", }) .unwrap_or_else(|| unreachable!("validated message has no payload"))}
pub fn error_or_empty(error: Option<String>) -> String { error.filter(|error| !error.is_empty()).unwrap_or_default()}
pub async fn write_message<W: AsyncWrite + Unpin>(writer: &mut W, msg: &Message) -> io::Result<()> { if let Err(err) = prost_protovalidate::validate(msg) { return Err(io::Error::new( io::ErrorKind::InvalidData, format!("validate agent message: {err}"), )); }
let mut data = Vec::new(); msg.encode(&mut data) .map_err(|err| io::Error::new(io::ErrorKind::InvalidData, err))?; if data.len() > MAX_MESSAGE_BYTES { return Err(io::Error::new( io::ErrorKind::InvalidData, format!("agent message exceeded {MAX_MESSAGE_BYTES} bytes"), )); }
writer.write_all(&(data.len() as u32).to_be_bytes()).await?; writer.write_all(&data).await?; writer.flush().await}
pub async fn read_message<R: AsyncRead + Unpin>(reader: &mut R) -> io::Result<Option<Message>> { let Some(header) = read_header(reader).await? else { return Ok(None); }; let size = u32::from_be_bytes(header) as usize; if size > MAX_MESSAGE_BYTES { return Err(io::Error::new( io::ErrorKind::InvalidData, format!("agent message exceeded {MAX_MESSAGE_BYTES} bytes"), )); }
let mut data = vec![0; size]; reader.read_exact(&mut data).await?; let msg = Message::decode(&data[..]) .map_err(|err| io::Error::new(io::ErrorKind::InvalidData, err))?;
if let Err(err) = prost_protovalidate::validate(&msg) { return Err(io::Error::new( io::ErrorKind::InvalidData, format!("validate agent message: {err}"), )); }
Ok(Some(msg))}
async fn read_header<R: AsyncRead + Unpin>(reader: &mut R) -> io::Result<Option<[u8; 4]>> { let mut header = [0; 4]; let mut read = 0; while read < header.len() { match reader.read(&mut header[read..]).await { Ok(0) if read == 0 => return Ok(None), Ok(0) => { return Err(io::Error::new( io::ErrorKind::UnexpectedEof, "partial agent message header", )); } Ok(n) => read += n, Err(err) if err.kind() == io::ErrorKind::Interrupted => {} Err(err) => return Err(err), } } Ok(Some(header))}
#[cfg(test)]mod tests { use super::*;
#[tokio::test] async fn round_trips_protobuf_message() { let msg = Message { id: "built-paths".to_owned(), built_paths: Some(v1::BuiltPaths { paths: vec!["/nix/store/abc-package".to_owned()], reason: "post_build_hook".to_owned(), }), ..Default::default() };
let mut encoded = Vec::new(); write_message(&mut encoded, &msg).await.unwrap();
let decoded = read_message(&mut &encoded[..]).await.unwrap().unwrap(); assert!(decoded.built_paths.is_some()); if let Some(p) = decoded.built_paths { assert_eq!(p.paths, ["/nix/store/abc-package"]); assert_eq!(p.reason, "post_build_hook"); } }
#[test] fn validates_messages() { // 1. valid message (exactly one field set) let valid = Message { id: "test-1".to_owned(), hello: Some(v1::Hello::default()), ..Default::default() }; assert!(prost_protovalidate::validate(&valid).is_ok());
// 2. invalid message (zero fields set) let invalid_zero = Message { id: "test-2".to_owned(), ..Default::default() }; assert!(prost_protovalidate::validate(&invalid_zero).is_err());
// 3. invalid message (multiple fields set) let invalid_multi = Message { id: "test-3".to_owned(), hello: Some(v1::Hello::default()), init: Some(v1::Init::default()), ..Default::default() }; assert!(prost_protovalidate::validate(&invalid_multi).is_err()); }}