90 lines
2.3 KiB
Rust
90 lines
2.3 KiB
Rust
//! Defines messages for cross-process message passing based on `ndjson` wire protocol
|
|
|
|
use std::{
|
|
convert::TryFrom,
|
|
io::{self, BufRead, Write},
|
|
};
|
|
|
|
use serde::{de::DeserializeOwned, Deserialize, Serialize};
|
|
|
|
use crate::{
|
|
rpc::{ListMacrosResult, ListMacrosTask},
|
|
ExpansionResult, ExpansionTask,
|
|
};
|
|
|
|
#[derive(Debug, Serialize, Deserialize, Clone)]
|
|
pub enum Request {
|
|
ListMacro(ListMacrosTask),
|
|
ExpansionMacro(ExpansionTask),
|
|
}
|
|
|
|
#[derive(Debug, Serialize, Deserialize, Clone)]
|
|
pub enum Response {
|
|
Error(ResponseError),
|
|
ListMacro(ListMacrosResult),
|
|
ExpansionMacro(ExpansionResult),
|
|
}
|
|
|
|
macro_rules! impl_try_from_response {
|
|
($ty:ty, $tag:ident) => {
|
|
impl TryFrom<Response> for $ty {
|
|
type Error = &'static str;
|
|
fn try_from(value: Response) -> Result<Self, Self::Error> {
|
|
match value {
|
|
Response::$tag(res) => Ok(res),
|
|
_ => Err(concat!("Failed to convert response to ", stringify!($tag))),
|
|
}
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
impl_try_from_response!(ListMacrosResult, ListMacro);
|
|
impl_try_from_response!(ExpansionResult, ExpansionMacro);
|
|
|
|
#[derive(Debug, Serialize, Deserialize, Clone)]
|
|
pub struct ResponseError {
|
|
pub code: ErrorCode,
|
|
pub message: String,
|
|
}
|
|
|
|
#[derive(Debug, Serialize, Deserialize, Clone)]
|
|
pub enum ErrorCode {
|
|
ServerErrorEnd,
|
|
ExpansionError,
|
|
}
|
|
|
|
pub trait Message: Serialize + DeserializeOwned {
|
|
fn read(inp: &mut impl BufRead) -> io::Result<Option<Self>> {
|
|
Ok(match read_json(inp)? {
|
|
None => None,
|
|
Some(text) => Some(serde_json::from_str(&text)?),
|
|
})
|
|
}
|
|
fn write(self, out: &mut impl Write) -> io::Result<()> {
|
|
let text = serde_json::to_string(&self)?;
|
|
write_json(out, &text)
|
|
}
|
|
}
|
|
|
|
impl Message for Request {}
|
|
impl Message for Response {}
|
|
|
|
fn read_json(inp: &mut impl BufRead) -> io::Result<Option<String>> {
|
|
let mut buf = String::new();
|
|
inp.read_line(&mut buf)?;
|
|
buf.pop(); // Remove traling '\n'
|
|
Ok(match buf.len() {
|
|
0 => None,
|
|
_ => Some(buf),
|
|
})
|
|
}
|
|
|
|
fn write_json(out: &mut impl Write, msg: &str) -> io::Result<()> {
|
|
log::debug!("> {}", msg);
|
|
out.write_all(msg.as_bytes())?;
|
|
out.write_all(b"\n")?;
|
|
out.flush()?;
|
|
Ok(())
|
|
}
|