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use std::error::Error as StdError;
use std::future::Future;
use std::{fmt, io};
use super::ProtocolVersion;
mod bytes;
mod collections;
#[cfg(feature = "nix-compat-derive")]
mod display;
mod int;
#[cfg(any(test, feature = "test"))]
pub mod mock;
mod writer;
pub use writer::{NixWriter, NixWriterBuilder};
pub trait Error: Sized + StdError {
fn custom<T: fmt::Display>(msg: T) -> Self;
fn io_error(err: std::io::Error) -> Self {
Self::custom(format_args!("There was an I/O error {}", err))
}
fn unsupported_data<T: fmt::Display>(msg: T) -> Self {
Self::custom(msg)
}
fn invalid_enum<T: fmt::Display>(msg: T) -> Self {
Self::custom(msg)
}
}
impl Error for io::Error {
fn custom<T: fmt::Display>(msg: T) -> Self {
io::Error::new(io::ErrorKind::Other, msg.to_string())
}
fn io_error(err: std::io::Error) -> Self {
err
}
fn unsupported_data<T: fmt::Display>(msg: T) -> Self {
io::Error::new(io::ErrorKind::InvalidData, msg.to_string())
}
}
pub trait NixWrite: Send {
type Error: Error;
/// Some types are serialized differently depending on the version
/// of the protocol and so this can be used for implementing that.
fn version(&self) -> ProtocolVersion;
/// Write a single u64 to the protocol.
fn write_number(&mut self, value: u64) -> impl Future<Output = Result<(), Self::Error>> + Send;
/// Write a slice of bytes to the protocol.
fn write_slice(&mut self, buf: &[u8]) -> impl Future<Output = Result<(), Self::Error>> + Send;
/// Write a value that implements `std::fmt::Display` to the protocol.
/// The protocol uses many small string formats and instead of allocating
/// a `String` each time we want to write one an implementation of `NixWrite`
/// can instead use `Display` to dump these formats to a reusable buffer.
fn write_display<D>(&mut self, msg: D) -> impl Future<Output = Result<(), Self::Error>> + Send
where
D: fmt::Display + Send,
Self: Sized,
{
async move {
let s = msg.to_string();
self.write_slice(s.as_bytes()).await
}
}
/// Write a value to the protocol.
/// Uses `NixSerialize::serialize` to write the value.
fn write_value<V>(&mut self, value: &V) -> impl Future<Output = Result<(), Self::Error>> + Send
where
V: NixSerialize + Send + ?Sized,
Self: Sized,
{
value.serialize(self)
}
}
impl<T: NixWrite> NixWrite for &mut T {
type Error = T::Error;
fn version(&self) -> ProtocolVersion {
(**self).version()
}
fn write_number(&mut self, value: u64) -> impl Future<Output = Result<(), Self::Error>> + Send {
(**self).write_number(value)
}
fn write_slice(&mut self, buf: &[u8]) -> impl Future<Output = Result<(), Self::Error>> + Send {
(**self).write_slice(buf)
}
fn write_display<D>(&mut self, msg: D) -> impl Future<Output = Result<(), Self::Error>> + Send
where
D: fmt::Display + Send,
Self: Sized,
{
(**self).write_display(msg)
}
fn write_value<V>(&mut self, value: &V) -> impl Future<Output = Result<(), Self::Error>> + Send
where
V: NixSerialize + Send + ?Sized,
Self: Sized,
{
(**self).write_value(value)
}
}
pub trait NixSerialize {
/// Write a value to the writer.
fn serialize<W>(&self, writer: &mut W) -> impl Future<Output = Result<(), W::Error>> + Send
where
W: NixWrite;
}
// Noop
impl NixSerialize for () {
async fn serialize<W>(&self, _writer: &mut W) -> Result<(), W::Error>
where
W: NixWrite,
{
Ok(())
}
}
|
